TLF42772ELXUMA2

TLF4277-2 Low Drop Out Linear Voltage Regulator Integrated Current Monitor Data Sheet Rev. 1.0, 2014-03-13 Automotive Power TLF4277-2 Table of Contents 1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 3.1 3.2 Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin Assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin Definitions and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 4.1 4.2 4.3 General Product Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Thermal Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 5.1 5.2 5.3 5.4 Voltage Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Description Voltage Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Electrical Characteristics Voltage Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Application Information for setting the variable output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Typical Performance Characteristics Voltage Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6 6.1 6.2 Current Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Electrical Characteristics Current Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Typical Performance Graphs Current Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 7 7.1 7.1.1 7.1.2 7.1.3 7.1.4 7.1.5 7.1.6 Current and Protection Monitor Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Description Current and Protection Monitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Linear Current Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Adjustable Output Current Limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Overvoltage Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Thermal Shutdown Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Status Output Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Typical Performance Graphs Current Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 8.1 8.2 Enable Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Description Enable Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Electrical Characteristics Enable Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 9 9.1 9.2 9.2.1 9.2.2 9.3 9.4 9.5 Application Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Application Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Selection of External Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Input Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Output Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Thermal Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reverse Polarity Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Further Application Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Package Outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 11 Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Data Sheet 2 6 6 7 7 14 14 15 16 16 16 16 18 20 20 20 20 20 21 22 22 Rev. 1.0, 2014-03-13 Low Drop Out Linear Voltage Regulator Integrated Current Monitor 1 TLF4277-2EL Overview Features • Integrated Current Monitor • Overvoltage, Overtemperature and Overcurrent Detection • Adjustable Output Voltage • Output Current up to 300 mA • Adjustable Output Current Limitation • Very Low Current Consumption • Very Low Dropout Voltage • Stable with Ceramic Output Capacitor of 1 µF • Wide Input Voltage Range up to 40 V • Reverse Polarity Protection • Short Circuit Protected • Overtemperature Shutdown • Automotive Temperature Range -40 °C ≤ Tj ≤ 150 °C • Green Product (RoHS and WEEE compliant) • AEC Qualified PG-SSOP14 EP Description The TLF4277-2 is the ideal companion IC to supply active antennas for car infotainment applications. The adjustable output voltage makes the TLF4277-2 capable of supplying the majority of standard active antennas such as: • FM/AM • DAB • XM • SIRIUS The TLF4277-2 is a monolithic integrated low drop out voltage regulator capable of supplying loads up to 300 mA. For an input voltage up to 40 V the TLF4277-2 provides an adjustable output voltage in a range from 5 V up to 12 V. The integrated current monitor function is a unique feature that provides diagnosis and system protection functionality. Fault conditions such as overtemperature and output overvoltage are monitored and indicated at the current sense output. The maximum output current limit of the device is adjustable to provide additional protection to the connected load. Via the enable function the IC can be disabled to lower the power consumption. The PG-SSOP14 EP package provides an enhanced thermal performance within a SO8 body size. Type Package Marking TLF4277-2EL PG-SSOP14 EP 4277-2 Data Sheet 3 Rev. 1.0, 2014-03-13 TLF4277-2 Block Diagram 2 Block Diagram I Q Internal Supply Bandgap Reference Current Monitor ADJ EN Protection circuits ST CSO Figure 1 Data Sheet GND Block and simplified application diagram TLF4277-2 (Package PG-SSOP14 EP) 4 Rev. 1.0, 2014-03-13 TLF4277-2 Pin Configuration 3 Pin Configuration 3.1 Pin Assignment I n.c. n.c. EN n.c. n.c. CSO 1 2 3 4 5 6 7 Figure 2 Pin Configuration (top view) 3.2 Pin Definitions and Functions SSOP-14 14 13 12 11 10 9 8 Q n.c. ADJ n.c. GND n.c. ST Pin Symbol Function 1 I IC Supply Place a capacitor from I to GND close to the IC for compensating line influences. 4 EN Enable High signal enables the regulator; Low signal disables the regulator; Connect to I, if the Enable function is not needed 7 CSO Current Sense Out Current monitor and status output 8 ST Status Output Digital output signal with open collector output. A low signal indicates fault conditions at the regulator‘s output. 10 GND Ground 12 ADJ Voltage Adjust Connect an external voltage divider to configure the output voltage 14 Q Regulator Output Connect a capacitor between Q and GND close to the IC pins, respecting the values given for its capacitance CQ and ESR in the table Chapter 4.2 PAD Heat sink Connect to PCB heat sink area and GND 2,3,5,6 n.c. Not Connected Internally not connected; Connect to PCB GND 9,11,13 n.c. Not Connected Internally not connected; Connect to PCB GND Data Sheet 5 Rev. 1.0, 2014-03-13 TLF4277-2 General Product Characteristics 4 General Product Characteristics 4.1 Absolute Maximum Ratings Table 1 Absolute Maximum Ratings1) Tj = -40 °C to +150 °C; all voltages with respect to ground, positive current flowing into pin (unless otherwise specified) Parameter Symbol Values Min. Unit Note / Test Condition Number Typ. Max. Voltage Ratings IC Supply I Enable Input EN Voltage Adjust Input ADJ Regulator Output Q Current Monitor Out CSO Status Output VI VEN VADJ VQ VCSO VST -16 45 V – P_4.1.1 -16 45 V – P_4.1.2 -0.3 16 V – P_4.1.3 -0.3 45 V VQ < VI + 5 V P_4.1.4 -0.3 5 V – P_4.1.5 -0.3 45 V 2) see also “Status Output Signal” P_4.1.6 Tj Tstg -40 150 °C – P_4.1.7 -55 150 °C – P_4.1.8 2 kV HBM3) Temperatures Junction Temperature Storage Temperature ESD Susceptibility VESD -2 ESD Susceptibility to GND VESD -500 ESD Susceptibility Pin 1, 7, 8, VESD1,7,8,14 -750 ESD Susceptibility to GND 500 750 V V P_4.1.9 CDM 4) P_4.1.10 CDM 4) P_4.1.11 14 (corner pins) to GND 1) Not subject to production test, specified by design. 2) Special care must be taken to control (e.g. by optical inspection) the proper handling of ST pin with an external resistor and not connecting directly to a higher voltage level, which allows an uncontrolled current flowing into the pin. 3) ESD susceptibility, HBM according to ANSI/ESDA/JEDEC JS001 (1.5 kΩ, 100 pF) 4) ESD susceptibility, Charged Device Model “CDM” according JEDEC JESD22-C101 Notes 1. Integrated protection functions are designed to prevent IC destruction under fault conditions described in the data sheet. Fault conditions are considered as “outside” normal operating range. Protection functions are not designed for continuous repetitive operation. 2. Stresses above the ones listed her may cause permanent damage to the device. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Data Sheet 6 Rev. 1.0, 2014-03-13 TLF4277-2 General Product Characteristics 4.2 Functional Range Table 2 Functional Range Parameter Symbol Input Voltage VI VQ RCSO CCSO Tj CQ ESRCQ Values Min. Output Voltage Range Current Sense Output Resistor 1) Current Sense Output Capacitor Junction Temperature 1) Output Capacitor Requirements 1) Output Capacitor Requirements Unit Note / Test Condition Number Typ. Max. VQ + Vdr – 40 V – P_4.2.1 5 – 12 V – P_4.2.2 850 – 25.5 k Ω – P_4.2.3 1 – 4.7 µF – P_4.2.4 -40 – 150 °C – 1 – – – – 10 µF Ω P_4.2.5 – 2) P_4.2.6 – 3) P_4.2.7 1) Not subject to production test, specified by design 2) The minimum output capacitance requirement is applicable for a worst case capacitance tolerance of 30% 3) Relevant ESR value at f = 10 kHz Note: Within the functional range the IC operates as described in the circuit description. The electrical characteristics are specified within the conditions given in the related electrical characteristics table. 4.3 Thermal Resistance Table 3 Thermal Resistance 1) Parameter Symbol Values Min. Typ. Max. Unit Note / Test Condition Number Junction to Case... RthJC – 8 – K/W measured to the exposed pad P_4.3.1 Junction to Ambient – 132 – K/W Footprint only2) P_4.3.2 Junction to Ambient RthJA RthJA – 59 – K/W 300 mm PCB heat sink area2) P_4.3.3 Junction to Ambient RthJA – 49 – K/W 600 mm2 PCB heat sink area2) P_4.3.4 Junction to Ambient RthJA – 42 – K/W 2s2p PCB3) P_4.3.5 2 1) Not subject to production test, specified by design 2) Specified RthJA value is according to Jedec JESD 51-3 at natural convection on FR4 1s0p board; The Product (Chip+Package) was simulated on a 76.2 × 114.3 × 1.5 mm3 board with 1 copper layer (1 x 70µm Cu). 3) Specified RthJA value is according to Jedec JESD51-2,-5,-7 at natural convection on FR4 2s2p board; The Product (Chip+Package) was simulated on a 76.2 x 114.3 x 1.5 mm³ board with 2 inner copper layers (2 x 70µm Cu, 2 x 35µm Cu). Where applicable a thermal via array under the exposed pad contacted the first inner copper layer. Data Sheet 7 Rev. 1.0, 2014-03-13 TLF4277-2 Voltage Regulator 5 Voltage Regulator 5.1 Description Voltage Regulator The output voltage VQ is controlled by comparing the feedback voltage (VADJ) to an internal reference voltage and driving a PNP pass transistor accordingly. The control loop stability depends on the output capacitor CQ, the output capacitor ESR, the load current and the chip temperature. To ensure stable operation, the output capacitor’s capacitance and its equivalent series resistor ESR requirements given in the Table 2 “Functional Range” on Page 7 have to be maintained. For stability details please refer to the typical performance graph “Output Capacitor Series Resistivity ESRCQ” on Page 11. In addition the output capacitor may need to be sized larger to buffer load transients. An input capacitor CI is not needed for the control loop stability, but recommended to buffer line influences. Connect the capacitors close to the IC terminals. In general a buffered supply voltage is recommended for the device. For details see Chapter 9.1. Protection circuitry prevents the IC as well as the application from destruction in case of catastrophic events. The integrated safeguards consist of output current limitation, reverse polarity protection as well as thermal shutdown in case of overtemperature. In order to avoid excessive power dissipation that could never be handled by the pass element and the package, an integrated safe operation monitor lowers the maximum output current input voltages above VBAT = 22 V. The thermal shutdown circuit prevents the IC from immediate destruction under fault conditions (e.g. output continuously short-circuited) by switching off the power stage. After the chip has cooled down, the regulator restarts. This leads to a cycling behavior of the output voltage until the fault is removed. However, junction temperatures above 150 °C are outside the maximum ratings and therefore significantly reduce the IC lifetime. The TLF4277-2 allows a negative supply voltage. However, several small currents are flowing into the IC increasing its junction temperature. This reverse current has to be considered for the thermal design, respecting that the thermal protection circuit is not operating during reverse polarity condition. Supply II I Q Regulated Output Voltage IQ Saturation Control Current Limitation ADJ CI VI EN CSO Figure 3 Data Sheet Bandgap Reference Temperature Shutdown C VQ ESR Load E.g. Antenna Amplitfier CQ ST GND Block Diagram Voltage Regulator Circuit 8 Rev. 1.0, 2014-03-13 TLF4277-2 Voltage Regulator 5.2 Electrical Characteristics Voltage Regulator Table 4 Electrical Characteristics: Voltage Regulator VBAT = 13.5 V, Tj = -40 °C to +150 °C, all voltages with respect to ground, direction of currents as shown in Figure 9.1 “Application Diagram” on Page 20 (unless otherwise specified) Parameter Symbol Values Unit Note / Test Condition Number P_5.2.1 Min. Typ. Max. VREF,int VQ – 1.19 – V 1) -2 – 2 % 1 mA ≤ IQ ≤ 300 mA; 9 V ≤ VBAT ≤ 16 V 5 V ≤ VQ ≤ 12 V with VBAT> VQ + 2V P_5.2.2 Output Voltage Tolerance VQ -2 – 2 % 1 mA ≤ IQ ≤ 150 mA; 6 V ≤ VBAT ≤ 16 V 5 V ≤ VQ ≤ 12 V with VBAT > VQ + 1V P_5.2.3 Output Voltage Tolerance VQ -2 – 2 % 1 mA ≤ IQ ≤ 100 mA; 16 V ≤ VBAT ≤ 32 V3) 5 V ≤ VQ ≤ 12 V P_5.2.4 Output Voltage Tolerance VQ -2 – 2 % 1 mA ≤ IQ ≤ 10 mA; 32 V ≤ VBAT ≤ 40 V3) 5 V ≤ VQ ≤ 12 V P_5.2.5 Load Regulation steady-state dVQ,load - 30 -5 – mV P_5.2.7 Line Regulation steady-state dVQ,line – 5 20 mV Power Supply Ripple Rejection1) PSRR 60 65 – dB Dropout Voltage Vdr = VI - VQ Vdr – 100 250 mV IQ = 1 mA to 250 mA; VBAT = 6 V; VQ = 5 V VBAT = 6 V to 32 V; IQ = 5 mA; VQ = 5 V fripple = 100 Hz; Vripple = 1 Vpp; VQ = 5 V; IQ < 100 mA IQ = 100 mA4) Dropout Voltage Vdr = VI - VQ Vdr Output Current Limitation IQ,max IQ IBAT 301 Overtemperature Shutdown Threshold Overtemperature Shutdown Threshold Hysteresis Reference Voltage Output Voltage Tolerance 2) Reverse Current Reverse Current at Negative Input Voltage 1) 2) 3) 4) – P_5.2.8 P_5.2.9 P_5.2.10 VQ=5 V – 200 500 mV IQ = 200 mA4) P_5.2.11 VQ=5 V – 700 mA 0 V ≤ VQ ≤ 0.95 * VQ,nom P_5.2.13 -2 -1 – mA -6 – mA VBAT =0 V; VQ = 5 V VBAT = -16 V; VQ = 0 V P_5.2.14 -10 Tj,sd 151 – 200 °C Tj increasing1) P_5.2.16 Tj,hy – 15 – K Tj decreasing1) P_5.2.17 P_5.2.15 Parameter not subject to production test; specified by design. Referring to the device tolerance only, the tolerance of the resistor divider can cause additional deviation. See typical performance graph for details. Measured when the output voltage VQ has dropped 100 mV from its nominal value. Data Sheet 9 Rev. 1.0, 2014-03-13 TLF4277-2 Voltage Regulator 5.3 Application Information for setting the variable output voltage The output voltage of the TLF4277-2 can be adjusted between 5 V and 12 V by an external output voltage devider, closing the control loop to the voltage adjust pin ADJ. The voltage at pin ADJ is compared to the internal reference of typical 1.19 V in an error amplifier. It controls the output voltage. I Q Saturation Control Current Limitation IQ R1 ADJ EN Temperature Shutdown CSO Figure 4 Bandgap Reference C R2 ESR CQ ST GND Application Detail External Components at Output for Variable Voltage Regulator The output voltage is calculated according to Equation (1): VQ = (R1 + R2)/R2 x VREF,int, neglecting IADJ (1) VREF,int is typically 1.19 V. To avoid errors caused by leakage current IADJ, we recommend to choose the resistor value for R2 < 27 kΩ. The accuracy of the resistors for the external voltage divider can lead to a higher tolerance of the output voltage. To achieve a reasonable accuracy resistors with a tolerance of 1% or lower are recommended for the feedback divider. Data Sheet 10 Rev. 1.0, 2014-03-13 TLF4277-2 Voltage Regulator 5.4 Typical Performance Characteristics Voltage Regulator Reference Voltage VREF,int vs. Junction Temperature Tj Output Capacitor Series Resistivity ESRCQ vs. Output Current IQ 1.30 Unstable Region 100 CQ = 1 µF VI = 6..28 V Tj = 25° 1.25 Stable Region ESR(CQ) [Ω ] VREF,int [V] 10 1.20 1 1.15 0.1 0.01 1.10 -40 0 40 80 120 0 160 100 Tj [°C] 200 300 IQ [mA] Dropout Voltage Vdr vs. Junction Temperature Tj Power Supply Ripple Rejection PSRR 100 300 250 IQ = 10 mA CQ = 1 µF VQ = 5V Vripple = 0.5 Vpp Tj = 25 °C 80 IQ = 200 mA 200 PSRR [dB] VDR [mV] 60 150 IQ = 100 mA 100 40 20 50 0 0 -40 0 40 80 120 10 160 Tj [°C] Data Sheet 100 1000 10000 100000 1000000 f [Hz] 11 Rev. 1.0, 2014-03-13 TLF4277-2 Current Consumption 6 Current Consumption 6.1 Electrical Characteristics Current Consumption Table 5 Electrical Characteristics: Current Consumption VBAT = 13.5 V, Tj = -40 °C to +150 °C, all voltages with respect to ground; direction of currents as shown in Figure 9.1 “Application Diagram” on Page 20 (unless otherwise specified) Parameter Symbol Values Min. Typ. Max. Unit Note / Test Condition Number IQ ≤ 200 µA ; Tj ≤ 25 °C; VEN = 5 V; Iq = II - IQ - ICSO IQ ≤ 200 µA; Tj ≤ 85 °C; VEN = 5 V; Iq = II - IQ - ICSO IQ = 50 mA; VEN = 5 V; Iq = II - IQ - ICSO IQ = 200 mA; VEN = 5 V; Iq = II - IQ - ICSO Tj ≤ 25 °C; VEN = 0 V Iq = II - IQ Tj ≤ 85 °C; VEN = 0 V Iq = II - IQ Tj ≤ 85 °C; VEN = 0.8 V Iq = II - IQ P_6.1.1 Current Consumption Iq,on – 150 200 µA Current Consumption Iq,on – – 250 µA Current Consumption Iq,on – 1.2 2.6 mA Current Consumption Iq,on – 5.5 11 mA Current Consumption Iq,off – – 3 µA Current Consumption Iq,off – – 5 µA Current Consumption Iq,off – – 15 µA Data Sheet 12 P_6.1.2 P_6.1.3 P_6.1.4 P_6.1.5 P_6.1.6 P_6.1.7 Rev. 1.0, 2014-03-13 TLF4277-2 Current Consumption 6.2 Typical Performance Graphs Current Consumption Current Consumption Iq,off vs. Junction Temperature Tj Current Consumption Iq,on vs. Junction Temperature Tj 14 300 VEN = 5 V IQ = 200µA VEN = 0.8 V 12 250 10 200 Iq,on [µA] Iq,off [µA] 8 6 150 100 4 50 2 0 0 -40 0 40 80 120 160 -40 Tj [°C] 0 40 80 120 160 Tj [°C] Current Consumption Iq,on vs. Output Current IQ 8 VEN = 5 V 6 Tj = 25° Iq,on [mA] Tj = 85° 4 2 0 0 100 200 300 IQ [mA] Data Sheet 13 Rev. 1.0, 2014-03-13 TLF4277-2 Current and Protection Monitor Functions 7 Current and Protection Monitor Functions 7.1 Functional Description Current and Protection Monitors The TLF4277-2 provides a set of advanced monitor functionality. The current flowing out of the power stage can be monitored at the CSO output. In addition the current limitation can be adjusted via external resistor. Events of the implemented protection functions are reported through dedicated voltage levels at the CSO output. This information can be processed by an external µC for system analysis and failure identification. The monitored events are over-current, overvoltage, and temperature shutdown. In addition all three fault conditions are routed also to the digital output pin ST. from power stage Current Monitor Monitor Circuits OC-Detection OV-Detection Buffer TSD-Detection OR CSO ST GND ICSO CCSO Figure 5 RCSO Block diagram current and protection monitor To reduce possible effects from the supply voltage VBAT additional filtering of the supply voltage is recommended. A 100 nF capacitor should be placed as close a possible to the IC terminal, which is connected to VBAT. Figure 6 shows the output level at the CSO pin versus the operation or fault condition. The graph is valid for the following set up of external components: CCSO = 2.2 µF RCSO = 1.5 kΩ Note: In case of high input voltage (VI > 20 V), high junction temperature (Tj > 151°C) and CSO pin is directly connected to GND without resistor, the return to normal operation from the “thermal shutdown mode” can‘t be ensured. Data Sheet 14 Rev. 1.0, 2014-03-13 TLF4277-2 Current and Protection Monitor Functions VCSO [V] 3,2 VQ Overvoltage (e.g. short to VBAT) 3.1 V typical 3,0 2,95 Overtemperature 2.80 V typical 2,65 Current limitation and output short circuit to GND 2.55 V typical 2,45 Linear Current Sense Band up to 2.45 V 0 Figure 6 163 170 Iout [mA] Output levels and functionality of the CSO output Note: The graph is just an example and only valid for an certain configuration of the external components. 7.1.1 Linear Current Monitor Inside the linear current monitor area the current driven out of the CSO pin is direct proportional to the output current (IQ). The level of the current ICSO can be calculated according to Equation (2): (2) ICSO = Data Sheet IQ FIQ/ICSO 15 Rev. 1.0, 2014-03-13 TLF4277-2 Current and Protection Monitor Functions 7.1.2 Adjustable Output Current Limitation The TLF4277-2 has an adjustable current limitation for the current flowing out of the power stage. If the level of the output current exceeds the defined current limit threshold (IQ,lim), the output current of the TLF4277-2 will be limited. Setting of the adjustable current limitation: (3) IQ,lim = 2.55V × FIQ/ICSO RCSO A voltage level as defined in “CSO Voltage Level” on Page 17 will be applied at the CSO pin. In addition the ST pin will be set low. Note: During power up of the device, the regulator works in output current limitation. Regardless if the output current is limited by the protection function according to “Output Current Limitation” on Page 9, or by the adjustable output current limitation according to “Adjustable Current Limit” on Page 17. If an adjustable current limit is set, the status output pin ST is set to low as long as the adjustable current limitation is active during power up sequence. Example: To achieve a current limitation of e.g. 170mA the following configuration can be used: IQ,lim = 2.55V × 100 1.5kΩ = 170mA FIQ/ICSO = 100 RCSO = 1.5 kΩ 7.1.3 Overvoltage Detection To detect a possible short circuit of the output to a higher supply rail the TLF4277-2 has an overvoltage detection implemented. An overvoltage will be detected, if the voltage level at the ADJ pin is 20% higher than the internal reference voltage VREF,int defined in “Reference Voltage” on Page 9. In case of overvoltage the CSO pin will set to a voltage level as defined in “CSO Voltage Level” on Page 17. In addition the ST pin will be set low. 7.1.4 Thermal Shutdown Detection If the junction temperature will exceed the limits defined in the “Overtemperature Shutdown Threshold” on Page 9 the TLF4277-2 will disable the output voltage. In this case a voltage level as defined in “CSO Voltage Level” on Page 17 will be applied at the CSO pin. In addition the ST pin will be set low. 7.1.5 Status Output Signal The status condition pin ST is an open collector output. An external pull-up resistor has to be applied for functionality and to limit the current into the pin (e.g. connect via a resistor to “Q”). Connecting the ST pin directly to a supply voltage may damage the device. Is one or more of the monitored protection functions (over-current, overvoltage and temperature shutdown) activated, the digital Status Output pin ST is set to “low”. Data Sheet 16 Rev. 1.0, 2014-03-13 TLF4277-2 Current and Protection Monitor Functions Table 6 Electrical Characteristics: Current Monitor Function VBAT = 13.5 V, Tj = -40 °C to +150 °C, all voltages with respect to ground, direction of currents as shown in Figure 9.1 “Application Diagram” on Page 20 (unless otherwise specified) Parameter Symbol Values Unit Note / Test Condition Min. Typ. Max. Number Linear Current Monitor Tj = -40° to 125°C VIN= 9 V to 16 V VQ = 5 V to 12 V VIN > VQ + 2.0 V1) 1 mA ≤ IQ ≤ 300 mA VQ = 5 V Current Monitor Factor Factor = IQ /ICSO (IQ = 10 mA - 150 mA) FIQ/ICSO 95 100 105 – Current Monitor Factor Factor = IQ /ICSO FIQ/ICSO 90 100 110 – – – 550 nA no load connected at Q R2 = 27 kΩ VQ = 5 V P_7.1.6 P_7.1.7 CSO current at no load condition ICSO,off P_7.1.1 P_7.1.5 Adjustable Current Limitation Adjustable Current Limit Range IQ,lim 10 - 300 mA 850 Ω < RCSO < 25.5 kΩ VQ < 0,95 * VQ,nom1) Adjustable Current Limit Tolerance IQ,lim -10 – 10 % 10 mA ≤ IQ,lim ≤ 300 mA P_7.1.8 Tj = -40° to 125°C 0.95*VQ,nom > VQ > 3.0 V Adjustable Current Limit Tolerance IQ,lim -10 – 25 % 10 mA ≤ IQ,lim ≤ 300 mA Tj = -40° to 125°C 0.95*VQ,nom > VQ > 0 V P_7.1.15 CSO Voltage Level Current limitation VCSO,cur_lim 2.45 2.55 2.65 V VQ < 0,95 * VQ,nom1) P_7.1.9 3.0 3.1 3.2 V VADJ > 1.2 * VREF,nom1) P_7.1.10 VCSO,TSD 2.65 2.8 2.95 V 151 °C < Tj < 180 °C P_7.1.12 Status Output Digital Signal Low Voltage VST,low – 0.2 0.4 V IST ≤ 1.8 mA P_7.1.13 Status Output Digital Signal Sink current IST – – 1.8 mA – P_7.1.14 Output Level Overvoltage Detected CSO Voltage Level Overvoltage detected VCSO,OV Output Level Overtemperature Detected CSO Voltage Level Overtemperature Detected 2) Status Output Signal 1) Referring to the device tolerance only, the tolerance of the external components can cause additional deviation 2) Specified by design; not subject to production test Data Sheet 17 Rev. 1.0, 2014-03-13 TLF4277-2 Current and Protection Monitor Functions 7.1.6 Typical Performance Graphs Current Monitor Current Monitor Factor FIQ/ICSO vs. Output Current IQ External Current Limitation IQ,lim vs. Junction Temperatur Tj 156 104 VQ,nom = 5 V RCSO = 1.69k VQ = 5 V Tj = 25° 154 102 IQ,lim [mA] 152 FIQ/ICSO 100 150 98 148 96 0 100 200 146 300 -40 IQ [mA] Data Sheet 0 40 80 120 Tj [°C] 18 Rev. 1.0, 2014-03-13 TLF4277-2 Enable Function 8 Enable Function 8.1 Description Enable Function The TLF4277-2 can be turned on or turned off via the EN Input. With voltage levels higher than VEN,high applied to the EN Input the device will be completely turned on. A voltage level lower than VEN,low sets the device to low quiescent current mode. In this condition the device is turned off and is not functional. The Enable Input has a build in hysteresis to avoid toggling between ON/OFF state, if signals with slow slope are applied to the input. Enable input pin has an internal pull down resistor. 8.2 Electrical Characteristics Enable Function Table 7 Electrical Characteristics: Enable Function VBAT = 13.5 V, Tj = -40 °C to +150 °C, all voltages with respect to ground, direction of currents as shown in Figure 9.1 “Application Diagram” on Page 20 (unless otherwise specified) Parameter Symbol Values Min. Typ. Max. Unit Note / Test Condition Number Enable Low Signal Valid VEN,low – – 0.8 V – P_8.2.1 Enable High Signal Valid VEN,high 2 – – V see also startup time P_8.2.7 P_8.2.2 Enable Threshold Hysteresis VEN,hyst 50 – – mV – P_8.2.3 Enable Input current IEN,high – – 5 µA VEN = 5 V P_8.2.4 Enable Input current IEN,high – – 20 µA VEN < 18 V P_8.2.5 Enable internal pull-down resistor REN 0.94 1.5 2.5 MΩ VEN < 5 V P_8.2.6 Startup time tEN – 180 – µs CQ = 1 µF; VQ,nom = 5 V; P_8.2.7 IQ,load = 150 mA; time from VEN > 2 V (0 V to 5 V transition) till VQ = 90 % of VQ,nom Data Sheet 19 Rev. 1.0, 2014-03-13 TLF4277-2 Application Information 9 Application Information Note: The following information is given as a hint for the implementation of the device only and shall not be regarded as a description or warranty of a certain functionality, condition or quality of the device. 9.1 Application Diagram Supply II I IQ Q Regulated Output Voltage CQ DI C I2 CI1