LT3593ES6-TRPBF

LT3593 1MHz White LED Driver with Output Disconnect and One Pin Current Programming FEATURES n n n n n n n n n n DESCRIPTION The LT®3593 is a step-up DC/DC converter designed to drive up to ten white LEDs in series from a Li-Ion cell. Series connection of the LEDs provides identical LED currents and eliminates the need for ballast resistors. The device features a unique high side LED current sense that enables the part to function as a “one wire current source” where the low side of the LED string can be returned to ground anywhere. Additional features include output disconnect in shutdown, open LED protection and 1-pin shutdown/LED current control. The CTRL pin is toggled to adjust the LED current via an internal counter and a 5-bit DAC. The LT3593 switches at 1MHz, allowing the use of tiny external components. Constant frequency switching results in low input noise and a small output capacitor. The LT3593 is available in the 6-lead DFN (2mm × 2mm) as well as the 6-lead SOT-23 packages. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Drives Up to Ten White LEDs from a 3V Supply One Pin Shutdown and Current Programming LEDs Disconnected in Shutdown 32:1 Linear Brightness Control Range VIN Range: 2.7V to 5.5V ±5% Output Current Accuracy at Full Scale Low Shutdown Current: 3μA 1MHz Switching Frequency Requires Only 1μF Output Capacitor Low Profile 6-Lead DFN (2mm × 2mm × 0.75mm) and 6-Lead SOT-23 Packages APPLICATIONS n n n n n Cell Phones Digital Cameras PDAs, Handheld Computers MP3 Players GPS Receivers TYPICAL APPLICATION Li-Ion Driver for Ten White LEDs VIN 3V TO 5V 10μH 1μF VIN SW CAP LT3593 SHUTDOWN AND CURRENT CONTROL CTRL GND LED 1μF EFFI CIENCY (%) 90 80 70 60 50 40 30 Conversion Efficiency VIN = 3.6V 10 LEDs 0 5 10 15 LED CURRENT (mA) 20 3593 TA01b 3593 TA01a 3593f 1 LT3593 ABSOLUTE MAXIMUM RATINGS (Note 1) Input Voltage...............................................................6V CTRL Voltage ..............................................................6V SW Voltage ...............................................................45V CAP Voltage ..............................................................45V LED Voltage ..............................................................45V Operating Junction Temperature Range (Note 2).................................................... –40°C to 85°C Maximum Junction Temperature........................... 125°C Storage Temperature Range................... –65°C to 150°C Lead Temperature (Soldering, 10 sec) TSOT Package................................................... 300°C PIN CONFIGURATION TOP VIEW TOP VIEW VIN 1 GND 2 CTRL 3 7 6 SW 5 CAP 4 LED CTRL 1 GND 2 VIN 3 6 LED 5 CAP 4 SW DC PACKAGE 6-LEAD (2mm × 2mm) PLASTIC DFN TJMAX = 125°C, θJA = 106°C/W EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB S6 PACKAGE 6-LEAD PLASTIC TSOT-23 TJMAX = 125°C, θJA = 192°C/W ORDER INFORMATION LEAD FREE FINISH LT3593EDC#PBF LT3593ES6#PBF TAPE AND REEL LT3593EDC#TRPBF LT3593ES6#TRPBF PART MARKING LDBR LTDBS PACKAGE DESCRIPTION 6-Lead (2mm × 2mm) Plastic DFN 6-Lead Plastic TSOT-23 TEMPERATURE RANGE –40°C to 85°C –40°C to 85°C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V, VCTRL = 3.6V, unless otherwise specified. PARAMETER Operating Voltage Range Supply Current Switching Frequency Maximum Duty Cycle Switch Current Limit Switch VCESAT ISW = 250mA Not Switching; During Current Programming CTRL = 0 0.85 92 550 CONDITIONS MIN 2.7 300 3 1 94 700 250 10 1.15 TYP MAX 5.5 UNITS V μA μA MHz % mA mV 3593f ELECTRICAL CHARACTERISTICS 2 LT3593 The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V, VCTRL = 3.6V, unless otherwise specified. PARAMETER Switch Leakage Current LED Pin Voltage Drop (VCAP – VLED) LED Pin Leakage Current CTRL High Threshold CTRL Low Threshold CTRL tPW CTRL tSD CTRL tEN Full-Scale LED Current LED Current Programming Resolution LED Current Limit CTRL Pin Bias Current Overvoltage Protection Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. VCTRL = 5.5V l ELECTRICAL CHARACTERISTICS CONDITIONS VSW = 30V ILED = 20mA CTRL = 0, VCAP = 35V MIN TYP 250 MAX 1 1 UNITS μA mV μA V V ns μs μs mA mA μA mA 1.6 0.4 Programming Pulse Width (Note 3) Time from CTRL = 0 to Shutdown Time from CTRL = 1 to Enable VCAP = 16V VCAP = 16V Linear Increments l 250 95 95 19 18.5 128 128 20 20 625 45 1 36 38 40 200 200 21 21.5 μA V Note 2: The LTC3593E is guaranteed to meet performance specifications from 0°C to 85°C operating junction temperature range. Specifications over the –40°C to 85°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. Note 3: Guaranteed by design. 3593f 3 LT3593 TYPICAL PERFORMANCE CHARACTERISTICS Switch Saturation Voltage (VCESAT) 600 SWITCH SATURATION VOLTAGE (mV) 500 100°C 400 25°C 300 –50°C 200 100 0 6 5 SHUTDOWN CURRENT (μA) QUIESCENT CURRENT (mA) 100°C 4 25°C 3 2 1 0 0 100 300 500 200 400 SWITCH CURRENT (mA) 600 3593 G01 TA = 25°C unless otherwise specified. Shutdown Current (VCTRL = 0V) 3.50 3.25 Quiescent Current (VCTRL = 3.6V) 100°C 3.00 25°C 2.75 –50°C 2.50 2.25 2.00 –50°C 2 3 4 VIN (V) 5 6 3593 G02 2 3 4 VIN (V) 5 6 3593 G03 LED Pin Voltage Drop (VCAP – VLED) 300 250 VCAP – VLED (mV) 200 150 100 50 0 25°C –50°C VIN = 3.6V VCAP = 16V LED PIN CURRENT LIMIT (mA) 100°C 46 LED Pin Current Limit 750 VIN = 3.6V VCAP = 16V 45 Switching Current Limit vs Temperature VIN = 3.6V SWITCH CURRNET LIMIT (mA) 100 3593 G05 700 44 650 43 600 0 5 10 15 LED CURRENT (mA) 20 3593 G04 42 –50 –25 0 25 50 TEMPERATURE (°C) 75 550 –50 –25 0 25 50 TEMPERATURE (°C) 75 100 3593 G06 Switching Waveform IL 200mA/DIV VCAP 200mV/DIV AC COUPLED VSW 20V/DIV VIN = 3.6V 1μs/DIV FRONT PAGE APPLICATION CIRCUIT 3393 G07 Transient Response VCTRL 5V/DIV IL 200mA/DIV VCAP 10V/DIV VIN = 3.6V 200μs/DIV FRONT PAGE APPLICATION CIRCUIT 3393 G08 3593f 4 LT3593 TYPICAL PERFORMANCE CHARACTERISTICS Open-Circuit Output Clamp Voltage INPUT CURRENT OUTPUT OPEN-CIRCUIT (mA) 40 OPEN-CIRCUIT CLAMP VOLTAGE (V) 10 OPEN-CIRCUIT CLAMP VOLTAGE (V) 9 8 7 6 5 4 3 2 2.0 2.5 3.0 3.5 4.0 4.5 VIN (V) 5.0 5.5 6.0 3593 G10 TA = 25°C unless otherwise specified. Open-Circuit Output Clamp Voltage vs Temperature 40 VIN = 3.6V 39 Input Current in Output Open Circuit 39 25°C 38 100°C –50°C 38 37 37 36 2 3 4 VIN (V) 5 6 3593 G09 36 –50 –25 0 25 50 TEMPERATURE (°C) 75 100 3593 G11 Input Current in Output Open-Circuit vs Temperatue INPUT CURRENT OUTPUT OPEN-CIRCUIT (mA) 8 7 6 5 4 3 2 –50 VIN = 3.6V SWITCHING FREQUENCY (kHz) 1150 1100 Switching Frequency vs Temperature 20 VIN = 3.6V LED Current vs CTRL Strobe Pulses VIN = 3.6V 10LEDS 15 LED CURRENT (mA) 1050 1000 950 900 850 –50 10 5 –25 0 25 50 TEMPERATURE (°C) 75 100 3593 G12 0 –25 50 0 25 TEMPERATURE (°C) 75 100 3593 G13 0 8 16 24 NUMBER OF CTRL STROBES 32 3593 G14 Full-Scale Current vs VIN 21.0 21.0 10 LEDs Full-Scale Current vs VCAP 21.0 Full-Scale Current vs Temperature VIN = 3.6V 10LEDS LED CURRENT (mA) LED CURRENT (mA) 20.5 20.5 FULL SCALE CURRENT (mA) 5 10 15 20 25 VCAP (V) 30 35 3593 G16 20.5 20.0 20.0 20.0 19.5 19.5 19.5 19.0 2.5 19.0 3.0 3.5 4.0 4.5 VIN (V) 5.0 5.5 6.0 3593 G15 19.0 –50 –25 0 25 50 TEMPERATURE (°C) 75 100 3593 G17 3593f 5 LT3593 PIN FUNCTIONS (DFN/TSOT) VIN (Pin 1/Pin 3): Input Supply Pin. Must be locally bypassed with a 1μF X5R or X7R type ceramic capacitor. GND (Pin 2/Pin 2): Ground Pin. Connect directly to local ground plane. SW (Pin 6/Pin 4): Switch Pin. Connect inductor between this pin and the VIN pin. Minimize inductance at this pin to minimize EMI. CAP (Pin 5/Pin 5): Output Pin. Connect to output capacitor. Minimize trace between this pin and output capacitor to reduce EMI. CTRL (Pin 3/Pin 1): Current Control and Shutdown Pin. This pin is used to program the LED output current. This pin is strobed up to 32 times to decrement the internal 5-bit DACs from full-scale to 1LSB. The counter will stop at 1LSB if the strobing continues beyond 32 counts. The pin must be held high after the final desired positive strobe edge. The data is transferred after a 128μs (typ) delay. The part can be reprogrammed to a different value after it has been enabled, however the current will change to the new value after 128μs. If CTRL is held low for longer than 128μs (typ), the part will go into shutdown. LED (Pin 4/Pin 6): LED Pin. An internal switch connects this pin to CAP The top of the LED string is connected . to this pin. When the part is in shutdown, the LED pin is switched off from CAP so no current runs through the LEDs. The switch is also used to sense the LED current when the part is on. Exposed Pad (Pin 7/NA): Ground. The Exposed Pad must be soldered to the PCB. BLOCK DIAGRAM 1 VIN PWM COMP DRIVER A2 R S Q Q1 OVERVOLTAGE PROTECTION CAP 5 6 SW + – RAMP GENERATOR VREF 1.24V SHDN OSCILLATOR 5-BIT LINEAR DAC A1 RC CC PIN NUMBERS REFER TO DFN PACKAGE. REFER TO PIN CONFIGURATION FOR TSOT PIN NUMBERS Figure 1. Block Diagram 6 – + + + A3 R – – M2 M1 SHDN LED 4 5-BIT COUNTER SHDN GND 7 2 3 CTRL 3593 F01 3593f LT3593 OPERATION The LT3593 uses a constant frequency, current mode control boost scheme to provide excellent line and load regulation. Operation can be best understood by referring to the Block Diagram in Figure 1. Output Disconnect An internal switch connects between the CAP pin and the LED pin. The top of the LED string is connected to the LED pin. The string can be terminated to ground or to VIN if a low number of LEDs are driven. When the part is in shutdown, the switch is off; allowing no current to run through the LEDs. Current Programming The LED current can be set to 32 different values (625μA – 20mA) by strobing the CTRL pin. A 5-bit counter is decremented by 1 on a CTRL pin rising edge, reducing the programmed current by 625μA each time. The desired current can be calculated by: ILED = 20mA – (N – 1) • 625μA where N is the number of rising edges. When the desired current setting is reached, the CTRL pin must stay high. 128μs after the last rising edge on the CTRL pin, the regulator will enable the output and start to regulate the LED current to the programmed value. Figure 2 shows an example of how the part can be programmed. If a different current is desired, the CTRL pin can be strobed again. The first falling edge will reset the internal register to the 20mA setting. While the new current is being programmed, the device will continue to regulate the previously programmed value until the CTRL pin has remained high for at least 128μs, at which time the regulated current will slew to the newly programmed value. Figure 3 shows how to program a new LED current level. If the CTRL pin is held low for longer than 128μs, the part will go into the shutdown mode. CTRL CTRL CTRL CTRL 3593 F02 FULL CURRENT 20mA 17.5mA 15mA 12.5mA Figure 2. Current Programming 128μs CTRL 20mA LED CURRENT 20mA 128μs 128μs 17.5mA 17.5mA SHDN 3593 F03 Figure 3. Current Programming and Shutdown Timing 3593f 7 LT3593 APPLICATIONS INFORMATION Inductor Selection A 10μH inductor is recommended for most LT3593 applications. Although small size and high efficiency are major concerns, the inductor should have low core losses at 1MHz and low DCR (copper wire resistance). Some inductors in this category with small size are listed in Table 1. The efficiency comparison of different inductors is shown in Figure 4. Table 1. Recommended Inductors PART LQH43CN100 LQH32CN100 NR3010T100M L (μH) 10 10 10 DCR (Ω) 0.24 0.44 0.45 CURRENT RATING (mA) 650 450 500 VENDOR Murata Taiyo Yuden Table 2 shows a list of several ceramic capacitor manufacturers. Consult the manufacturers for detailed information on their entire selection of ceramic parts. Table 2. Recommended Ceramic Capacitor Manufacturers Taiyo Yuden AVX Murata Kemet (408) 573-4150 www.t-yuden.com (803) 448-9411 www.avxcorp.com (714) 852-2001 www.murata.com (408) 986-0424 www.kemet.com Diode Selection Schottky diodes, with their low forward voltage drop and fast reverse recovery, are the ideal choices for LT3593 applications. The forward voltage drop of a Schottky diode represents the conduction losses in the diode, while the diode capacitance (CT or CD) represents the switching losses. For diode selection, both forward voltage drop and diode capacitance need to be considered. Schottky diodes with higher current ratings usually have lower forward voltage drop and larger diode capacitance, which can cause significant switching losses at the 1.0MHz switching frequency of the LT3593. A Schottky diode rated at 400mA to 500mA is sufficient for most LT3593 applications. Some recommended Schottky diodes are listed in Table 3. Table 3. Recommended Schottky Diodes FORWARD VOLTAGE DIODE CURRENT DROP CAPACITANCE (mA) (V) (pF) MANUFACTURER 500 1000 520 0.47 at 500mA 0.55 at 1A 0.50 at 400mA 0.47 at 500mA 50 at 1V 80 at 4V 15 at 30V Central 631-435-1110 www.centralsemi.com Zetex 631-543-7100 www.zetex.com Phillips +3140 27 24825 www.semiconductors. phillips.com VLF4012AT-100M VLF3010AT-100M DE2812-1098AS-100M DB3015C-1068AS-100M 10 10 10 10 0.20 0.58 0.29 0.38 500 490 580 400 TDK TOKO 90.00 80.00 EFFI CIENCY (%) 70.00 60.00 50.00 40.00 30.00 0.00 NR3010T100M VLF4012-AT-100MR50 LQH43CN100K03 VLF3010AT-100MR49 LQH32CN100K53 DB3015C-1068AS-100M 10.00 5.00 15.00 LED CURRENT (mA) 20.00 3593 F04 PART NUMBER CMDSH05-4 CMMSH1-40 ZLL5400 Figure 4. Efficiency Comparison of Different Inductors Capacitor Selection The small size of ceramic capacitors makes them ideal for LT3593 applications. Use only X5R and X7R types because they retain their capacitance over wider voltage and temperature ranges than other types such as Y5V or Z5U. A 1μF input capacitor and a 1μF output capacitor are sufficient for most applications. PMEG4005AEA 500 50 at 1V 3593f 8 LT3593 APPLICATIONS INFORMATION Overvoltage Protection The LT3593 has an internal open-circuit protection circuit. In the case of an output open circuit, when the LEDs are disconnected from the circuit or the LEDs fail open, VCAP is clamped at 38V. The LT3593 will then switch at a very low frequency to minimize input current. VCAP and input current during output open circuit are shown in the Typical Performance Characteristics. Figure 5 shows the transient response when the LEDs are disconnected. Low Input Voltage Applications The LT3593 can be used in low input voltage applications. The input supply voltage to the LT3593 must be 2.7V or higher, but the inductor can be run off a lower battery voltage. This technique allows the LEDs to be powered off two alkaline cells. Most portable devices have a 3.3V logic supply voltage which can be used to power the LT3593. The LEDs can be driven straight from the battery, resulting in higher efficiency. Figure 6 shows three LEDs powered by two AA cells. The battery is connected to the inductors and the chip is powered off a 3.3V logic supply voltage. 2 AA CELLS 2V TO 3.2V L1 10μH C1 1μF C3 1μF VIN LT3593 CTRL GND D1 C2 1μF CAP SW 3.3V IL 200mA/DIV SHUTDOWN AND CURRENT CONTROL LED VCAP 20V/DIV VSW 20V/DIV 3593 F05 VIN = 3.6V 400μs/DIV FRONT PAGE LEDs DISCONNECTED APPLICATION CIRCUIT AT THIS INSTANT 3593 F06 C1: TAIYO YUDEN EMK107B5105MA C2: MURATA GRM31MR71H105KA88 L1: MURATA LQH43CN100 D1: CENTRAL CMDSH05-4 Figure 5. Output Open-Circuit Waveform Figure 6. Two AA Cells to Three White LEDs 3593f 9 LT3593 APPLICATIONS INFORMATION Board Layout Considerations As with all switching regulators, careful attention must be paid to the PCB layout and component placement. To prevent electromagnetic interference (EMI) problems, proper layout of high frequency switching paths is essential. Minimize the length and area of all traces connected to the Switching node pin (SW). Keep the sense voltage pins (CAP and LED) away from the switching node. Place C2 next to the CAP pin. Always use a ground plane under the switching regulator to minimize interplane coupling. Recommended component placement is shown in Figure 7. L1 VIN C1 D1 D1 4 5 6 L1 VIN 3 2 1 CTRL C1 1 2 7 6 5 4 CTRL 3 GND C2 C2 3593 F07 GND DFN Package TSOT-23 Package Figure 7. Recommended Component Placement 3593f 10 LT3593 TYPICAL APPLICATIONS Li-Ion Driver for One White LED 70 C2 1μF L1 10μH C1 1μF EFFICIENCY (%) 60 50 40 30 20 LED GND 3593 TA02a Conversion Efficiency VIN = 3.6V 1 LED D1 VIN 3V TO 5V VIN SW CAP LT3593 SHUTDOWN AND CURRENT CONTROL CTRL 10 0 5 10 15 LED CURRENT (mA) 20 3593 TA02b C1: TAIYO YUDEN EMK107BJ105MA C2: TAIYO YUDEN GMK316BJ105ML L1: MURATA LQH43CN100 D1: CENTRAL CMDSH05-4 Li-Ion Driver for Two White LED 80 C2 1μF L1 10μH C1 1μF EFFICIENCY (%) 70 60 50 40 30 LED GND 3593 TA03a Conversion Efficiency VIN = 3.6V 2 LEDs D1 VIN 3V TO 5V VIN SW CAP LT3593 SHUTDOWN AND CURRENT CONTROL CTRL 20 0 5 10 15 LED CURRENT (mA) 20 3593 TA03b C1: TAIYO YUDEN EMK107BJ105MA C2: TAIYO YUDEN GMK316BJ105ML L1: MURATA LQH43CN100 D1: CENTRAL CMDSH05-4 3593f 11 LT3593 TYPICAL APPLICATIONS Li-Ion Driver for Three White LEDs L1 10μH VIN 3V TO 5V C1 1μF Efficiency 90 VIN = 3.6V 3 LEDs D1 C2 1μF 80 EFFICIENCY (%) 70 60 50 40 VIN SW CAP LT3593 SHUTDOWN AND CURRENT CONTROL CTRL GND LED 3593 TA04a C1: TAIYO YUDEN EMK107BJ105MA C2: TAIYO YUDEN GMK316BJ105ML L1: MURATA LQH43CN100 D1: CENTRAL CMDSH05-4 30 0 5 10 15 LED CURRENT (mA) 20 3593 TA04b Li-Ion Driver for Four White LEDs L1 10μH VIN 3V TO 5V C1 1μF D1 C2 1μF Efficiency 90 80 EFFICIENCY (%) 70 60 50 40 VIN = 3.6V 4 LEDs VIN SW CAP LT3593 SHUTDOWN AND CURRENT CONTROL CTRL GND LED 3593 TA05a 30 C1: TAIYO YUDEN EMK107BJ105MA C2: TAIYO YUDEN GMK316BJ105ML L1: MURATA LQH43CN100 D1: CENTRAL CMDSH05-4 0 5 15 10 LED CURRENT (mA) 20 3593 TA05b Li-Ion Driver for Six White LEDs L1 10μH VIN 3V TO 5V C1 1μF Efficiency 90 VIN = 3.6V 6 LEDs D1 C2 1μF 80 EFFICIENCY (%) 70 60 50 40 30 VIN SW CAP LT3593 SHUTDOWN AND CURRENT CONTROL CTRL GND LED 0 5 15 10 LED CURRENT (mA) 20 3593 TA06b 3593 TA06a C1: TAIYO YUDEN EMK107BJ105MA C2: TAIYO YUDEN GMK316BJ105ML L1: MURATA LQH43CN100 D1: CENTRAL CMDSH05-4 3593f 12 LT3593 TYPICAL APPLICATIONS Li-Ion Driver For Ten White LEDs L1 10μH VIN 3V TO 5V C1 1μF 90 D1 80 EFFICIENCY (%) VIN SW CAP LT3593 SHUTDOWN AND CURRENT CONTROL CTRL GND 40 30 LED C2 1μF 70 60 50 VIN = 3.6V 10 LEDs Efficiency 0 5 15 10 LED CURRENT (mA) 20 3593 TA07b 3593 TA07a C1: TAIYO YUDEN EMK107BJ105MA C2: MURATA GRM31MR71H105KA88 L1: MURATA LQH43CN100 D1: CENTRAL CMDSH05-4 Li-Ion Driver For Ten White LEDs L1 22μH VIN 3V TO 5V C1 1μF 90 D1 80 EFFICIENCY (%) VIN SW CAP LT3593 SHUTDOWN AND CURRENT CONTROL CTRL GND 40 30 LED C2 2.2μF 70 60 50 VIN = 3.6V 10 LEDs Efficiency 0 5 15 10 LED CURRENT (mA) 20 3593 TA08b 3593 TA08a C1: TAIYO YUDEN EMK107BJ105MA C2: MURATA GRM31CR71H225KA88 L1: MURATA LQH43CN220 D1: CENTRAL CMDSH05-4 3593f 13 LT3593 PACKAGE DESCRIPTION DC Package 6-Lead Plastic DFN (2mm × 2mm) (Reference LTC DWG # 05-08-1703) 0.675 ± 0.05 2.50 ± 0.05 1.15 ± 0.05 0.61 ± 0.05 (2 SIDES) PACKAGE OUTLINE 0.25 ± 0.05 0.50 BSC 1.42 ± 0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS R = 0.115 TYP 0.56 ± 0.05 (2 SIDES) 2.00 ± 0.10 (4 SIDES) PIN 1 CHAMFER OF EXPOSED PAD 3 0.200 REF 0.75 ± 0.05 1 (DC6) DFN 1103 0.38 ± 0.05 4 6 PIN 1 BAR TOP MARK (SEE NOTE 6) 0.25 ± 0.05 0.50 BSC 1.37 ± 0.05 (2 SIDES) 0.00 – 0.05 BOTTOM VIEW—EXPOSED PAD NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WCCD-2) 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE 3593f 14 LT3593 PACKAGE DESCRIPTION S6 Package 6-Lead Plastic TSOT-23 (Reference LTC DWG # 05-08-1636) 0.62 MAX 0.95 REF 2.90 BSC (NOTE 4) 1.22 REF 3.85 MAX 2.62 REF 1.4 MIN 2.80 BSC 1.50 – 1.75 (NOTE 4) PIN ONE ID RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.95 BSC 0.30 – 0.45 6 PLCS (NOTE 3) 0.80 – 0.90 0.20 BSC 1.00 MAX DATUM ‘A’ 0.01 – 0.10 0.30 – 0.50 REF NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193 0.09 – 0.20 (NOTE 3) 1.90 BSC S6 TSOT-23 0302 REV B 3593f Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 15 LT3593 TYPICAL APPLICATION Li-Ion Driver for Six LEDs L1 10μH VIN 3V TO 5V C1 1μF Efficiency 90 VIN = 3.6V 6 LEDs D1 C2 1μF 80 EFFICIENCY (%) 70 60 50 40 30 VIN SW CAP LT3593 SHUTDOWN AND CURRENT CONTROL CTRL GND LED 0 5 10 15 LED CURRENT (mA) 20 3593 TA06b 3593 TA06a C1: TAIYO YUDEN EMK107BJ105MA C2: TAIYO YUDEN GMK316BJ105ML L1: MURATA LQH43CN100 D1: CENTRAL CMDSH05-4 RELATED PARTS PART NUMBER LT1932 LT1937 LTC®3200 LTC3200-5 LTC3201 LTC3202 LTC3205 LTC3210 LT3465/LT3465A DESCRIPTION Constant Current, 1.2MHz, High Efficiency White LED Boost Regulator Constant Current, 1.2MHz, High Efficiency White LED Boost Regulator Low Noise, 2MHz Regulated Charge Pump White LED Driver Low Noise, 2MHz Regulated Charge Pump White LED Driver Low Noise, 1.7MHz Regulated Charge Pump White LED Driver Low Noise, 1.5MHz Regulated Charge Pump White LED Driver High Efficiency, Multidisplay LED Controller Low Noise Charge Pump LED Controller Constant Current, 1.2MHz/2.7MHz, High Efficiency White LED Boost Regulator with Integrated Schottky Diode Dual Full Function, 2MHz Diodes White LED Step-Up Converter with Built-In Schottkys Dual 1.3A White LED Converter with 1000:1 True Color PWM Dimming White LED Driver with Integrated Schottky White LED Driver with Integrated Schottky COMMENTS Up to 8 White LEDs, VIN: 1V to 10V, VOUT(MAX) = 34V, IQ = 1.2mA, ISD < 1μA, ThinSOTTM Package Up to 4 White LEDs, VIN: 2.5V to 10V, VOUT(MAX) = 34V, IQ = 1.9mA, ISD < 1μA, ThinSOT and SC70 Packages Up to 6 White LEDs, VIN: 2.7V to 4.5V, IQ = 8mA, ISD < 1μA, MS Package Up to 6 White LEDs, VIN: 2.7V to 4.5V, IQ = 8mA, ISD < 1μA, ThinSOT Package Up to 6 White LEDs, VIN: 2.7V to 4.5V, IQ = 6.5mA, ISD < 1μA, MS Package Up to 8 White LEDs, VIN: 2.7V to 4.5V, IQ = 5mA, ISD < 1μA, MS Package Up to 4 (Main), 2 (Sub) and RGB, VIN: 2.8V to 4.5V, IQ = 50μA, ISD < 1μA, 24-Lead QFN Package Up to 4 White LEDs and One High current CAM LED, VIN: 2.9V to 4.5V, IQ = 4.5mA, ISD < 6μA, UD Package Up to 6 White LEDs, VIN: 2.7V to 16V, VOUT(MAX) = 34V, IQ = 1.9mA, ISD < 1μA, ThinSOT Package Up to 20 White LEDs, VIN: 2.7V to 24V, VOUT(MAX) = 39V, DFN and TSSOP-16 Packages Drives Up to 16 100mA White LEDs. VIN: 2.5V to 24V, VOUT(MAX) = 36V, DFN and TSSOP Packages Up to 6 White LEDs, VIN: 2.5V to 12V, IQ = 2.6mA, ISD < 10μA, SC70 and 2mm × 2mm DFN Packages Up to 10 White LEDs, VIN: 2.5V to 12V, IQ = 4mA, ISD < 11μA, 3mm × 2mm DFN Package LT3466/LT3466-1 LT3486 LT3491 LT3591 ThinSOT is a trademark of Linear Technology Corporation. 3593f 16 Linear Technology Corporation (408) 432-1900 ● FAX: (408) 434-0507 ● LT 0308 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 www.linear.com © LINEAR TECHNOLOGY CORPORATION 2008