MIC79050-4.2BSTR

MIC79050 Simple Lithium-Ion Battery Charger Features General Description • High-Accuracy Charge Voltage: ±0.75% over –5°C to + 60°C (Li-ion charging temperature range) • Zero Off-Mode Current • 10 µA Reverse Leakage • Ultra-Low 380 mV Dropout at 500 mA • Wide Input Voltage Range • Logic-Controlled Enable Input (8-Lead Devices Only) • Thermal Shutdown and Current-Limit Protection • Power MSOP-8, Power SOIC-8, and SOT-223 Packages • Pulse Charging Capability The MIC79050 is a simple single-cell lithium-ion battery charger. It includes an on-chip pass transistor for high precision charging. Featuring ultra-high precision (±0.75% over the Li-ion battery charging temperature range) and “zero” off-mode current, the MIC79050 provides a very simple, cost effective solution for charging lithium-ion battery. Applications • • • • • Li-Ion Battery Charger Cellular Phones Palmtop Computers PDAs Self-Charging Battery Packs Other features of the MIC79050 include current-limit and thermal shutdown protection. In the event the input voltage to the charger is disconnected, the MIC79050 also provides minimal reverse-current and reversed-battery protection. The MIC79050 is a fixed 4.2V device and comes in the thermally-enhanced MSOP-8, SOIC-8, and SOT-223 packages. The 8-lead versions also come equipped with enable and feedback inputs. All versions are specified over the temperature range of –40°C to +125°C. Package Types MIC79050 3-Lead SOT-223 (S) GND TAB 1 IN 2 MIC79050 8-Lead SOIC/MSOP (M/MM) EN 1 8 GND IN 2 7 GND BAT 3 6 GND FB 4 5 GND 3 GND BAT  2017 - 2022 Microchip Technology Inc. and its subsidiaries. DS20005771B-page 1 MIC79050 Typical Application Circuits Pulse-Charging Application Simplest Battery Charging Solution Regulated or unregulated wall adapter MIC79050-4.2YS IN BAT 4.2V 0.75% over Temp Li-Ion Cell GND MIC79050-4.2YMM Regulated or unregulated wall adapter IN BAT EN FB GND 4.2V 0.75% Li-Ion Cell External PWM* *See Applications Information Functional Block Diagrams 3-Lead Version VIN VBAT IN Bandgap Ref. Current Limit Thermal Shutdown MIC79050-4.2YS GND 8-Lead Version VIN VBAT IN FB Bandgap VRef. REF EN Current Limit Thermal Shutdown MIC79050-4.2YM/YMM GND DS20005771B-page 2  2017 - 2022 Microchip Technology Inc. and its subsidiaries. MIC79050 1.0 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings † Supply Input Voltage (VIN) .......................................................................................................................... –20V to +20V Power Dissipation (PD) (Note 1) ............................................................................................................ Internally Limited Operating Ratings ‡ Supply Input Voltage (VIN) ......................................................................................................................... +2.5V to +16V Enable Input Voltage (VEN) .................................................................................................................................0V to VIN † Notice: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended periods may affect device reliability. ‡ Notice: The device is not guaranteed to function outside its operating ratings. Note 1: The maximum allowable power dissipation at any TA (ambient temperature) is calculated using: PD(max) = (TJ(max) – TA) ÷ θJA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown. ELECTRICAL CHARACTERISTICS Electrical Characteristics: VIN = VBAT + 1.0V; COUT = 4.7 μF, IOUT = 100 μA; TJ = +25°C, bold values indicate –40°C ≤ TJ ≤ +125°C; unless noted. Parameter Symbol Min. Typ. Max. Units VBAT –0.75 — 0.75 % Battery Voltage Temperature Coefficient ΔVBAT/ ΔT — 40 — ppm/°C Line Regulation ΔVBAT/ VBAT — 0.009 0.05 — — 0.1 Load Regulation ΔVBAT/ VBAT — 0.05 0.5 — — 0.7 VIN – VBAT — 380 500 — — 600 — 85 130 — — 170 — 11 20 — — 25 — 0.05 3 Battery Voltage Accuracy Dropout Voltage (Note 3) Ground Pin Current (Note 4, Note 5) Ground Pin Quiescent Current (Note 5) IGND IGND Ripple Rejection PSRR Current Limit ILIMIT Thermal Regulation ENABLE Input Enable Input Logic-Low Voltage ΔVBAT/ ΔPD VENL — 0.10 8 — 75 — — 750 900 — — 1000 — 0.05 — — 0.4 — — — 0.18 2.0 — —  2017 - 2022 Microchip Technology Inc. and its subsidiaries. %/V % Conditions Variation from nominal VOUT, –5°C to +60°C Note 1 VIN = VBAT + 1V to 16V IOUT = 100 μA to 500 mA, Note 2 mV IOUT = 500 mA µA VEN ≥ 3.0V, IOUT = 100 μA mA VEN ≥ 3.0V, IOUT = 500 mA µA VEN ≤ 0.4V (shutdown) VEN ≤ 0.18V (shutdown) dB f = 120 Hz mA VBAT = 0V %/W V Note 6 VEN = logic-low (shutdown) VEN = logic-high (enabled) DS20005771B-page 3 MIC79050 ELECTRICAL CHARACTERISTICS (CONTINUED) Electrical Characteristics: VIN = VBAT + 1.0V; COUT = 4.7 μF, IOUT = 100 μA; TJ = +25°C, bold values indicate –40°C ≤ TJ ≤ +125°C; unless noted. Parameter Symbol Enable Input Current IENL — IENH Note 1: 2: 3: 4: 5: 6: Min. Typ. Max. — 0.01 –1 — 0.01 –2 — 5 20 — — 25 Units µA µA Conditions VENL ≤ 0.4V (shutdown) VENL ≤ 0.18V (shutdown) VENH ≥ 2.0V (enabled) Battery voltage temperature coefficient is the worst case voltage change divided by the total temperature range. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load range from 100 μA to 500 mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification. Dropout voltage is defined as the input to battery output differential at which the battery voltage drops 2% below its nominal value measured at 1V differential. Ground pin current is the charger quiescent current plus pass transistor base current. The total current drawn from the supply is the sum of the load current plus the ground pin current. VEN is the voltage externally applied to devices with the EN (enable) input pin. MSOP-8 (MM) and SOIC-8 (M) packages only. Thermal regulation is the change in battery voltage at a time “t” after a change in power dissipation is applied, excluding load or line regulation effects. Specifications are for a 500 mA load pulse at VIN = 16V for t = 10 ms. DS20005771B-page 4  2017 - 2022 Microchip Technology Inc. and its subsidiaries. MIC79050 TEMPERATURE SPECIFICATIONS (Note 1) Parameters Sym. Min. Typ. Max. Units Conditions Junction Operating Temperature Range TJ –40 — +125 °C — Storage Temperature Range TS –65 — +150 °C — Lead Temperature — — — +260 °C Soldering, 5s Thermal Resistance MSOP-8 JA — 80 — °C/W — Thermal Resistance SOIC-8 JA — 63 — °C/W — JC — 15 — °C/W — JA — 62 — °C/W — Temperature Ranges Package Thermal Resistances (Note 2) Thermal Resistance SOT-223 Note 1: 2: The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable junction temperature and the thermal resistance from junction to air (i.e., TA, TJ, JA). Exceeding the maximum allowable power dissipation will cause the device operating junction temperature to exceed the maximum +125°C rating. Sustained junction temperatures above +125°C can impact the device reliability. The maximum allowable power dissipation at any TA (ambient temperature) is calculated using: PD(max) = (TJ(max) – TA) ÷ θJA. Exceeding the maximum allowable power dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.  2017 - 2022 Microchip Technology Inc. and its subsidiaries. DS20005771B-page 5 MIC79050 2.0 Note: TYPICAL PERFORMANCE CURVES The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range. 5 OUTPUT VOLTAGE (V) DROPOUT VOLTAGE (mV) 400 300 200 100 0 0 Dropout Voltage vs. Output GROUND CURRENT (mA) DROPOUT VOLTAGE (mV) 400 300 200 100 0 -40 0 40 80 TEMPERATURE (°C) FIGURE 2-2: Temperature. 2 4 INPUT VOLTAGE (V) 6 Dropout Characteristics. 10 8 6 4 2 0 0 120 Dropout Voltage vs. FIGURE 2-5: Current. 100 200 300 400 500 OUTPUT CURRENT (mA) Output Current vs. Ground 1.5 4 3 2 5mA 50mA, 150mA 2 4 6 8 10 12 14 16 INPUT VOLTAGE (V) FIGURE 2-3: DS20005771B-page 6 Dropout Characteristics. GROUND CURRENT (mA) 5 OUTPUT VOLTAGE (V) 1 12 500 0 0 500mA 2 FIGURE 2-4: 600 1 250mA 3 0 0 100 200 300 400 500 OUTPUT CURRENT (mA) FIGURE 2-1: Current. 4 50mA 1 5mA 0.5 0 0 FIGURE 2-6: Voltage. 4 8 12 SUPPLY VOLTAGE (V) 16 Ground Current vs. Supply  2017 - 2022 Microchip Technology Inc. and its subsidiaries. MIC79050 20 13.5 GROUND CURRENT (mA) GROUND CURRENT (mA) 25 500mA 15 10 5 0 0 FIGURE 2-7: Voltage. 250mA 125mA 1 2 3 4 5 SUPPLY VOLTAGE (V) OUTPUT VOLTAGE (V) 0 40 80 TEMPERATURE (°C) 120 Ground Current vs. GROUND CURRENT (mA) 4.0 3.8 3.6 3.4 3.2 FIGURE 2-9: Temperature. 0 40 80 TEMPERATURE (°C) 120 Ground Current vs. 4.205 4.200 4.195 4.190 -40 -20 0 20 40 60 80 100120140 TEMPERATURE (°C) FIGURE 2-11: Temperature. SHORT CIRCUIT CURRENT (mA) GROUND CURRENT (μA) 50 3.0 -40 11.5 4.210 100 FIGURE 2-8: Temperature. 12.0 FIGURE 2-10: Temperature. 150 0 -40 12.5 11.0 -40 6 Ground Current vs. Supply 13.0 0 40 80 TEMPERATURE (°C) 120 Ground Current vs.  2017 - 2022 Microchip Technology Inc. and its subsidiaries. Battery Voltage vs. 800 700 600 500 400 300 200 100 0 -40 FIGURE 2-12: Temperature. 0 40 80 TEMPERATURE (°C) 120 Short-Circuit Current vs. DS20005771B-page 7 0.25 Upper Lower -0.25 -0.75 0 200 REVERSE LEAKAGE CURRENT (μA) FIGURE 2-13: vs. Time. 400 600 TIME (hrs) 800 Typical Voltage Drift Limits 20 15 10 5 0 0 1 2 3 4 OUTPUT VOLTAGE (V) 5 FIGURE 2-14: Reverse Leakage Current vs. Output Voltage. DS20005771B-page 8 REVERSE LEAKAGE CURRENT (μA) 0.75 20 4.2V 15 3.6V 10 3.0V 5 VIN+VE N FLOATING 5 15 25 35 45 55 TEMPERATURE (°C) 0 -5 FIGURE 2-15: Reverse Leakage Current vs. Output Voltage. REVERSE LEAKAGE CURRENT (μA) DRIFT FROM NOMINAL VOUT (%) MIC79050 20 4.2V 15 3.6V 10 3.0V 5 V +V IN 0 -5 FIGURE 2-16: vs. Temperature. EN GROUNDED 5 15 25 35 45 55 TEMPERATURE (°C) Reverse Leakage Current  2017 - 2022 Microchip Technology Inc. and its subsidiaries. MIC79050 3.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1. TABLE 3-1: Pin Number SOT-223 PIN FUNCTION TABLE Pin Number SOIC-8, MSOP-8 Pin Name 1 2 IN 2, TAB 5, 6, 7, 8 GND Description Supply input. Ground: SOT-223 pin 2 and TAB are internally connected. SOIC-8 pins 5 through 8 are internally connected. 3 3 BAT Battery voltage output. — 1 EN Enable (Input): TTL/CMOS-compatible control input. Logic-high = enable; logic-low or open = shutdown. — 4 FB Feedback node.  2017 - 2022 Microchip Technology Inc. and its subsidiaries. DS20005771B-page 9 MIC79050 4.0 FUNCTIONAL DESCRIPTION The MIC79050 is a high-accuracy, linear battery charging circuit designed for the simplest implementation of a single lithium-ion (Li-ion) battery charger. The part can operate from a regulated or unregulated power source, making it ideal for various applications. The MIC79050 can take an unregulated voltage source and provide an extremely accurate termination voltage. The output voltage varies only 0.75% from nominal over the standard temperature range for Li-ion battery charging (–5°C to +60°C). With a minimum of external components, an accurate constant-current charger can be designed to provide constant-current, constant-voltage charging for Li-ion cells. 4.1 Input Voltage The MIC79050 can operate with an input voltage up to 16V (20V absolute maximum), ideal for applications where the input voltage can float high, such as an unregulated wall adapter that obeys a load-line. Higher voltages can be sustained without any performance degradation to the output voltage. The line regulation of the device is typically 0.009%/V; that is, a 10V change on the input voltage corresponds to a 0.09% change in output voltage. 4.2 4.3 Feedback The feedback pin allows for external manipulation of the control loop. This node is connected to an external resistive divider network, which is connected to the internal error amplifier. This amplifier compares the voltage at the feedback pin to an internal voltage reference. The loop then corrects for changes in load current or input voltage by monitoring the output voltage and linearly controlling the drive to the large, PNP pass element. By externally controlling the voltage at the feedback pin the output can be disabled or forced to the input voltage. Pulling and holding the feedback pin low forces the output low. Holding the feedback pin high forces the pass element into saturation, where the output will be the input minus the saturation (dropout) voltage. 4.4 Battery Output The BAT pin is the output of the MIC79050 and connects directly to the cell to provide charging current and voltage. When the input is left floating or grounded, the BAT pin limits reverse current to