LT3593 1MHz White LED Driver with Output Disconnect and One Pin Current Programming FEATURES DESCRIPTION n 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. n n n n n n n n n 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 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. Cell Phones Digital Cameras PDAs, Handheld Computers MP3 Players GPS Receivers L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION Li-Ion Driver for Ten White LEDs 90 10μH 1μF 1μF VIN SW CAP LT3593 SHUTDOWN AND CURRENT CONTROL CTRL LED GND VIN = 3.6V 10 LEDs 80 EFFI CIENCY (%) VIN 3V TO 5V Conversion Efficiency 70 60 50 40 30 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 6 SW VIN 1 GND 2 CTRL 3 7 5 CAP 4 LED CTRL 1 6 LED GND 2 5 CAP VIN 3 4 SW S6 PACKAGE 6-LEAD PLASTIC TSOT-23 DC PACKAGE 6-LEAD (2mm × 2mm) PLASTIC DFN TJMAX = 125°C, θJA = 192°C/W TJMAX = 125°C, θJA = 106°C/W EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LT3593EDC#PBF LT3593EDC#TRPBF LDBR 6-Lead (2mm × 2mm) Plastic DFN –40°C to 85°C LT3593ES6#PBF LT3593ES6#TRPBF LTDBS 6-Lead Plastic TSOT-23 –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/ ELECTRICAL CHARACTERISTICS 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 CONDITIONS Operating Voltage Range Supply Current MIN TYP 2.7 Not Switching; During Current Programming MAX 5.5 300 CTRL = 0 UNITS V μA 3 10 Switching Frequency 0.85 1 1.15 Maximum Duty Cycle 92 94 % Switch Current Limit 550 700 mA 250 mV Switch VCESAT ISW = 250mA μA MHz 3593f 2 LT3593 ELECTRICAL CHARACTERISTICS 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 CONDITIONS Switch Leakage Current VSW = 30V LED Pin Voltage Drop (VCAP – VLED) ILED = 20mA LED Pin Leakage Current CTRL = 0, VCAP = 35V MIN TYP MAX 1 250 μA mV 1 CTRL High Threshold UNITS μA 1.6 V CTRL Low Threshold 0.4 V CTRL tPW Programming Pulse Width (Note 3) 250 CTRL tSD Time from CTRL = 0 to Shutdown 95 128 200 μs CTRL tEN Time from CTRL = 1 to Enable 95 128 200 μs Full-Scale LED Current VCAP = 16V VCAP = 16V 19 18.5 20 20 21 21.5 mA mA LED Current Programming Resolution Linear Increments l LED Current Limit CTRL Pin Bias Current ns 625 μA 45 mA VCTRL = 5.5V 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. l 36 38 1 μA 40 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) 100°C 400 25°C 300 –50°C 200 3.25 100°C 4 25°C –50°C 3 2 1 100 0 100 300 500 200 400 SWITCH CURRENT (mA) 600 LED Pin Voltage Drop (VCAP – VLED) 2 3 4 VIN (V) 6 5 LED PIN CURRENT LIMIT (mA) 100°C 200 25°C 150 –50°C 100 50 5 2.00 10 15 LED CURRENT (mA) 20 3 4 VIN (V) 6 5 3593 G03 Switching Current Limit vs Temperature 750 VIN = 3.6V VIN = 3.6V VCAP = 16V 45 44 43 42 –50 2 3593 G02 46 VIN = 3.6V VCAP = 16V 0 –50°C 2.50 LED Pin Current Limit 300 250 25°C 2.75 SWITCH CURRNET LIMIT (mA) 0 100°C 3.00 2.25 3593 G01 VCAP – VLED (mV) QUIESCENT CURRENT (mA) SHUTDOWN CURRENT (μA) SWITCH SATURATION VOLTAGE (mV) 3.50 5 500 0 Quiescent Current (VCTRL = 3.6V) Shutdown Current (VCTRL = 0V) 6 600 0 TA = 25°C unless otherwise specified. –25 0 25 50 TEMPERATURE (°C) 75 3593 G04 100 700 650 600 550 –50 –25 0 25 50 TEMPERATURE (°C) 3593 G05 75 100 3593 G06 Transient Response Switching Waveform VCTRL 5V/DIV IL 200mA/DIV IL 200mA/DIV VCAP 200mV/DIV AC COUPLED VCAP 10V/DIV VSW 20V/DIV VIN = 3.6V 1μs/DIV FRONT PAGE APPLICATION CIRCUIT 3393 G07 VIN = 3.6V 200μs/DIV FRONT PAGE APPLICATION CIRCUIT 3393 G08 3593f 4 LT3593 TYPICAL PERFORMANCE CHARACTERISTICS Open-Circuit Output Clamp Voltage 100°C –50°C 37 3 2 4 VIN (V) 5 6 8 7 6 5 4 3 2 2.0 3.5 6 5 4 3 0 25 50 TEMPERATURE (°C) 4.0 4.5 VIN (V) 5.0 5.5 75 0 25 50 TEMPERATURE (°C) 75 100 3593 G11 LED Current vs CTRL Strobe Pulses VIN = 3.6V 10LEDS 15 1050 1000 950 10 5 900 0 –25 50 0 25 TEMPERATURE (°C) 75 100 0 32 8 16 24 NUMBER OF CTRL STROBES 3593 G14 3593 G13 Full-Scale Current vs Temperature Full-Scale Current vs VCAP 21.0 21.0 10 LEDs FULL SCALE CURRENT (mA) VIN = 3.6V 10LEDS 20.5 LED CURRENT (mA) 20.0 20.0 19.5 19.5 19.0 3.0 –25 VIN = 3.6V 850 –50 100 20.5 LED CURRENT (mA) 36 –50 6.0 1100 Full-Scale Current vs VIN 19.0 2.5 37 3593 G10 3593 G12 21.0 38 20 1150 SWITCHING FREQUENCY (kHz) INPUT CURRENT OUTPUT OPEN-CIRCUIT (mA) 3.0 39 Switching Frequency vs Temperature 7 –25 2.5 3593 G09 VIN = 3.6V 2 –50 VIN = 3.6V 9 Input Current in Output Open-Circuit vs Temperatue 8 40 LED CURRENT (mA) 36 10 OPEN-CIRCUIT CLAMP VOLTAGE (V) INPUT CURRENT OUTPUT OPEN-CIRCUIT (mA) OPEN-CIRCUIT CLAMP VOLTAGE (V) 39 38 Open-Circuit Output Clamp Voltage vs Temperature Input Current in Output Open Circuit 40 25°C TA = 25°C unless otherwise specified. 3.5 4.0 4.5 VIN (V) 5.0 5.5 6.0 3593 G15 5 10 15 20 25 VCAP (V) 30 35 3593 G16 20.5 20.0 19.5 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. 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. 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. 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. 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. Exposed Pad (Pin 7/NA): Ground. The Exposed Pad must be soldered to the PCB. BLOCK DIAGRAM 1 6 VIN SW PWM COMP – DRIVER A2 R + S Q1 Q CAP OVERVOLTAGE PROTECTION 5 + + – R A3 – M2 M1 RAMP GENERATOR VREF 1.24V OSCILLATOR 5-BIT LINEAR DAC – SHDN SHDN LED A1 4 + RC CC 5-BIT COUNTER GND 7 2 SHDN CTRL 3 3593 F01 PIN NUMBERS REFER TO DFN PACKAGE. REFER TO PIN CONFIGURATION FOR TSOT PIN NUMBERS Figure 1. Block Diagram 3593f 6 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 FULL CURRENT 20mA CTRL 17.5mA CTRL 15mA CTRL 12.5mA 3593 F02 Figure 2. Current Programming 128μs 128μs 128μs CTRL 20mA 20mA 17.5mA LED CURRENT 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 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 Table 1. Recommended Inductors Kemet L (μH) 10 10 10 DCR (Ω) 0.24 0.44 0.45 CURRENT RATING (mA) 650 450 500 VLF4012AT-100M VLF3010AT-100M 10 10 0.20 0.58 500 490 TDK DE2812-1098AS-100M DB3015C-1068AS-100M 10 10 0.29 0.38 580 400 TOKO PART LQH43CN100 LQH32CN100 NR3010T100M VENDOR Murata Taiyo Yuden 90.00 EFFI CIENCY (%) 80.00 70.00 40.00 30.00 0.00 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 60.00 50.00 (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 NR3010T100M VLF4012-AT-100MR50 LQH43CN100K03 VLF3010AT-100MR49 LQH32CN100K53 DB3015C-1068AS-100M 10.00 5.00 15.00 LED CURRENT (mA) 20.00 PART NUMBER FORWARD VOLTAGE DIODE CURRENT DROP CAPACITANCE (mA) (V) (pF) MANUFACTURER CMDSH05-4 500 0.47 at 500mA 50 at 1V CMMSH1-40 1000 0.55 at 1A 80 at 4V ZLL5400 520 0.50 at 400mA 15 at 30V Zetex 631-543-7100 www.zetex.com PMEG4005AEA 500 0.47 at 500mA 50 at 1V Phillips +3140 27 24825 www.semiconductors. phillips.com 3593 F04 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. Central 631-435-1110 www.centralsemi.com 3593f 8 LT3593 APPLICATIONS INFORMATION Overvoltage Protection Low Input Voltage Applications 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. 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 3.3V IL 200mA/DIV L1 10μH C1 1μF C3 1μF SHUTDOWN AND CURRENT CONTROL D1 C2 1μF SW VIN CAP LT3593 CTRL LED GND VCAP 20V/DIV VSW 20V/DIV 3593 F06 3593 F05 VIN = 3.6V 400μs/DIV FRONT PAGE LEDs DISCONNECTED APPLICATION CIRCUIT AT THIS INSTANT Figure 5. Output Open-Circuit Waveform C1: TAIYO YUDEN EMK107B5105MA C2: MURATA GRM31MR71H105KA88 L1: MURATA LQH43CN100 D1: CENTRAL CMDSH05-4 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 L1 VIN VIN C1 2 CTRL 3 7 D1 D1 4 3 5 5 2 4 6 1 6 1 C1 CTRL GND GND C2 C2 3593 F07 DFN Package TSOT-23 Package Figure 7. Recommended Component Placement 3593f 10 LT3593 TYPICAL APPLICATIONS Li-Ion Driver for One White LED Conversion Efficiency 70 C2 1μF C1 1μF VIN D1 SW EFFICIENCY (%) VIN 3V TO 5V L1 10μH 60 VIN = 3.6V 1 LED 50 40 30 CAP 20 LT3593 SHUTDOWN AND CURRENT CONTROL LED CTRL GND 10 0 5 3593 TA02a 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 Conversion Efficiency 80 C2 1μF C1 1μF VIN D1 SW EFFICIENCY (%) VIN 3V TO 5V L1 10μH 70 VIN = 3.6V 2 LEDs 60 50 40 CAP 30 LT3593 SHUTDOWN AND CURRENT CONTROL LED CTRL GND 20 3593 TA03a 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 C1 1μF VIN CTRL 80 C2 1μF SW CAP LT3593 SHUTDOWN AND CURRENT CONTROL VIN = 3.6V 3 LEDs D1 EFFICIENCY (%) VIN 3V TO 5V Efficiency 90 L1 10μH LED GND 70 60 50 40 3593 TA04a 30 C1: TAIYO YUDEN EMK107BJ105MA C2: TAIYO YUDEN GMK316BJ105ML L1: MURATA LQH43CN100 D1: CENTRAL CMDSH05-4 0 5 C1 1μF VIN Efficiency 90 D1 C2 1μF SW CAP LT3593 SHUTDOWN AND CURRENT CONTROL CTRL LED GND VIN = 3.6V 4 LEDs 80 EFFICIENCY (%) VIN 3V TO 5V 20 3593 TA04b Li-Ion Driver for Four White LEDs L1 10μH 10 15 LED CURRENT (mA) 70 60 50 40 3593 TA05a 30 C1: TAIYO YUDEN EMK107BJ105MA C2: TAIYO YUDEN GMK316BJ105ML L1: MURATA LQH43CN100 D1: CENTRAL CMDSH05-4 0 5 VIN D1 LT3593 SHUTDOWN AND CURRENT CONTROL CTRL 80 C2 1μF SW CAP EFFICIENCY (%) C1 1μF Efficiency 90 L1 10μH LED GND 20 3593 TA05b Li-Ion Driver for Six White LEDs VIN 3V TO 5V 15 10 LED CURRENT (mA) VIN = 3.6V 6 LEDs 70 60 50 40 30 3593 TA06a 0 5 15 10 LED CURRENT (mA) 20 3593 TA06b 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 = 3.6V 10 LEDs D1 80 C1 1μF VIN C2 1μF SW CAP EFFICIENCY (%) VIN 3V TO 5V Efficiency 90 LT3593 SHUTDOWN AND CURRENT CONTROL CTRL LED 70 60 50 GND 40 30 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 90 L1 22μH D1 80 C1 1μF VIN C2 2.2μF SW CAP EFFICIENCY (%) VIN 3V TO 5V Efficiency LT3593 SHUTDOWN AND CURRENT CONTROL CTRL LED VIN = 3.6V 10 LEDs 70 60 50 GND 40 30 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) 0.38 ± 0.05 4 6 2.00 ±0.10 (4 SIDES) PIN 1 BAR TOP MARK (SEE NOTE 6) PIN 1 CHAMFER OF EXPOSED PAD 3 0.200 REF 0.75 ±0.05 1 (DC6) DFN 1103 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 2.90 BSC (NOTE 4) 0.95 REF 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 0.30 – 0.45 6 PLCS (NOTE 3) 0.95 BSC 0.80 – 0.90 0.20 BSC 0.01 – 0.10 1.00 MAX DATUM ‘A’ 0.30 – 0.50 REF 0.09 – 0.20 (NOTE 3) 1.90 BSC S6 TSOT-23 0302 REV B 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 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 90 L1 10μH C1 1μF VIN D1 SW CAP LT3593 SHUTDOWN AND CURRENT CONTROL CTRL 80 C2 1μF EFFICIENCY (%) VIN 3V TO 5V Efficiency LED GND VIN = 3.6V 6 LEDs 70 60 50 40 30 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 LTC3205 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 LTC3210 Low Noise Charge Pump LED Controller LT3465/LT3465A LT3491 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 LT3591 White LED Driver with Integrated Schottky LT1937 LTC®3200 LTC3200-5 LTC3201 LTC3202 LT3466/LT3466-1 LT3486 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 ThinSOT is a trademark of Linear Technology Corporation. 3593f 16 Linear Technology Corporation LT 0308 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2008