LDBR

LT3593 LINER

Document overview

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Technical content

FEATURES

APPLICATIONS

DESCRIPTION

1MHz White LED Driver with Output Disconnect and One Pin Current Programming The L T®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 L T3593 switches at 1MHz, allowing the use of tiny external components. Constant frequency switching re- sults in low input noise and a small output capacitor . The L T3593 is available in the 6-lead DFN (2mm × 2mm) as well as the 6-lead SOT-23 packages. Li-Ion Driver for Ten White LEDs n Drives Up to Ten White LEDs from a 3V Supply n One Pin Shutdown and Current Programming n LEDs Disconnected in Shutdown n 32:1 Linear Brightness Control Range n V IN Range: 2.7V to 5.5V n ±5% Output Current Accuracy at Full Scale n Low Shutdown Current: 3μA n 1MHz Switching Frequency n Requires Only 1μF Output Capacitor n Low Profi le 6-Lead DFN (2mm × 2mm × 0.75mm) and 6-Lead SOT-23 Packages n Cell Phones n Digital Cameras n PDAs, Handheld Computers n MP3 Players n GPS Receivers CTRL VIN 10μH VIN 3V TO 5V

3593 TA01a

1μF 1μF Conversion Effi ciency LED CURRENT (mA) EFFI CIENCY (%)

3593 TA01b

VIN = 3.6V

10 LEDs

L, L T , L TC and L TM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

(Note 1) TOP VIEW SW CAP LED V IN GND CTRL 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 CTRL 1 GND 2 VIN 3

6 LED

5 CAP

TJMAX = 125°C, θJA = 192°C/W PIN CONFIGURATION ORDER INFORMATION

ELECTRICAL CHARACTERISTICS

PARAMETER CONDITIONS MIN TYP MAX UNITS Operating Voltage Range 2.7 5.5 V Supply Current Not Switching; During Current Programming 300 μA CTRL = 0 3 10 μA Switching Frequency 0.85 1 1.15 MHz Maximum Duty Cycle 92 94 % Switch Current Limit 550 700 mA Switch VCESAT ISW = 250mA 250 mV The l denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 3.6V , VCTRL = 3.6V , unless otherwise specifi ed. LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE L T3593EDC#PBF L T3593EDC#TRPBF LDBR 6-Lead (2mm × 2mm) Plastic DFN –40°C to 85°C L T3593ES6#PBF L T3593ES6#TRPBF L TDBS 6-Lead Plastic TSOT-23 –40°C to 85°C Consult L TC Marketing for parts specifi ed with wider operating temperature ranges. Consult L TC Marketing for information on non-standard lead based fi nish parts. For more information on lead free part marking, go to: http://www.linear .com/leadfree/ For more information on tape and reel specifi cations, go to: http://www.linear .com/tapeandreel/ Operating Junction Temperature Range Lead Temperature (Soldering, 10 sec)

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. ELECTRICAL CHARACTERISTICS The l denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VIN = 3.6V , VCTRL = 3.6V , unless otherwise specifi ed. PARAMETER CONDITIONS MIN TYP MAX UNITS Switch Leakage Current V SW = 30V 1 μA LED Pin Voltage Drop (VCAP – VLED)I LED = 20mA 250 mV LED Pin Leakage Current CTRL = 0, V CAP = 35V 1 μA CTRL High Threshold 1.6 V CTRL Low Threshold 0.4 V CTRL tPW Programming Pulse Width (Note 3) 250 ns 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 V CAP = 16V VCAP = 16V l 18.5 21.5 mA mA LED Current Programming Resolution Linear Increments 625 μA LED Current Limit 45 mA CTRL Pin Bias Current V CTRL = 5.5V 1 μA Overvoltage Protection l 36 38 40 V Note 2: The L TC3593E is guaranteed to meet performance specifi cations from 0°C to 85°C operating junction temperature range. Specifi cations 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.

TYPICAL PERFORMANCE CHARACTERISTICS Switch Saturation Voltage (VCESAT) Shutdown Current (VCTRL = 0V) LED Pin Voltage Drop (VCAP – VLED) Switching Waveform Quiescent Current (VCTRL = 3.6V) Switching Current Limit vs Temperature TA = 25°C unless otherwise specifi ed. T ransient Response VIN (V) SHUTDOWN CURRENT (μA)

3593 G02

–50°C25°C 100°C LED CURRENT (mA) VCAP – VLED (mV) 300 200 100 250 150 155

3593 G04

–50°C 25°C 100°C VIN = 3.6V VCAP = 16V TEMPERATURE (°C) –50 LED PIN CURRENT LIMIT (mA) 750–25 25

3593 G05

VIN = 3.6V VCAP = 16V LED Pin Current Limit IL 200mA/DIV 200μs/DIVVIN = 3.6V FRONT PAGE APPLICATION CIRCUIT

3393 G08

SWITCH CURRENT (mA) SWITCH SATURATION VOL TAGE (mV) 600 400 200 500 300 100 400200

3593 G01

–50°C 100 500 100°C 25°C VIN (V) QUIESCENT CURRENT (mA) 3.50 3.00 2.50 3.25 2.75 2.25 2.00

3593 G03

–50°C 25°C 100°C TEMPERATURE (°C) –50 SWITCH CURRNET LIMIT (mA) 750 650 700 600 550 25 50 75–25

3593 G06

VIN = 3.6V VCAP 200mV/DIV AC COUPLED 1μs/DIVVIN = 3.6V FRONT PAGE APPLICATION CIRCUIT

3393 G07

Input Current in Output Open Circuit Open-Circuit Output Clamp Voltage vs Temperature Input Current in Output Open-Circuit vs Temperatue Switching Frequency vs Temperature Full-Scale Current vs VIN Full-Scale Current vs VCAP Full-Scale Current vs Temperature TYPICAL PERFORMANCE CHARACTERISTICSTA = 25°C unless otherwise specifi ed. LED Current vs CTRL Strobe Pulses TEMPERATURE (°C) –50 OPEN-CIRCUIT CLAMP VOL TAGE (V) 750–25 25

3593 G11

VIN = 3.6V NUMBER OF CTRL STROBES LED CURRENT (mA) 1682 4

3593 G14

VIN = 3.6V 10LEDS VCAP (V) LED CURRENT (mA) 21.0 20.5 20.0 19.0 25201510 30

3593 G16

19.5 TEMPERATURE (°C) –50 FULL SCALE CURRENT (mA) 21.0 20.5 20.0 19.0 0–25 50 75 25

3593 G17

VIN = 3.6V 10LEDS 19.5 VIN (V) OPEN-CIRCUIT CLAMP VOL TAGE (V) 543

3593 G09

25°C 100°C –50°C VIN (V) 2.0 2.5 INPUT CURRENT OUTPUT OPEN-CIRCUIT (mA) 5.0 5.53.0 3.5

3593 G10

6.04.0 4.5 TEMPERATURE (°C) –50 INPUT CURRENT OUTPUT OPEN-CIRCUIT (mA) 750–25 25

3593 G12

VIN = 3.6V TEMPERATURE (°C) –50 SWITCHING FREQUENCY (kHz) 1150 1050 1100 1000 850 750–25 25

3593 G13

VIN = 3.6V 950 900 VIN (V) 2.5 LED CURRENT (mA) 21.0 20.5 19.0 5.03.53.0 4.0

3593 G15

6.05.54.5 20.0 19.5

passed with a 1μF X5R or X7R type ceramic capacitor . CTRL (Pin 3/Pin 1): Current Control and Shutdown Pin. at 1LSB if the strobing continues beyond 32 counts. than 128μs (typ), the part will go into shutdown.

3593 F01

Figure 1. Block Diagram

to the Block Diagram in Figure 1. reducing the programmed current by 625μA each time. current setting is reached, the CTRL pin must stay high. an example of how the part can be programmed. to program a new LED current level. will go into the shutdown mode. Figure 2. Current Programming

3593 F02

3593 F03

Figure 3. Current Programming and Shutdown Timing

Table 1. The effi ciency comparison of different inductors Table 1. Recommended Inductors suffi cient for most applications. on their entire selection of ceramic parts. Table 2. Recommended Ceramic Capacitor Manufacturers recommended Schottky diodes are listed in Table 3. Table 3. Recommended Schottky Diodes Figure 4. Effi ciency Comparison of Different Inductors

3593 F04

Figure 5. Output Open-Circuit Waveform Figure 6. T wo AA Cells to Three White LEDs The L T3593 has an internal open-circuit protection circuit. response when the LEDs are disconnected. The L T3593 can be used in low input voltage applications. supply voltage which can be used to power the L T3593. Figure 6 shows three LEDs powered by two AA cells. powered off a 3.3V logic supply voltage.

2 AA CELLS

3593 F06

3593 F05

component placement is shown in Figure 7. Figure 7. Recommended Component Placement proper layout of high frequency switching paths is essential.

3593 F07

Li-Ion Driver for One White LED Li-Ion Driver for T wo White LED Conversion Effi ciency Conversion Effi ciency LED VIN 10μH VIN 3V TO 5V

3593 TA02a

1μF 1μF SHUTDOWN AND CURRENT CONTROL C1: TAIYO YUDEN EMK107BJ105MA C2: TAIYO YUDEN GMK316BJ105ML L1: MURATA LQH43CN100 D1: CENTRAL CMDSH05-4 LED VIN 10μH VIN 3V TO 5V

3593 TA03a

1μF 1μF SHUTDOWN AND CURRENT CONTROL C1: TAIYO YUDEN EMK107BJ105MA C2: TAIYO YUDEN GMK316BJ105ML L1: MURATA LQH43CN100 D1: CENTRAL CMDSH05-4 LED CURRENT (mA) EFFICIENCY (%)

3593 TA02b

VIN = 3.6V

1 LED

LED CURRENT (mA) EFFICIENCY (%)

3593 TA03b

VIN = 3.6V

2 LEDs

Li-Ion Driver for Three White LEDs Li-Ion Driver for Four White LEDs Effi ciency Effi ciency CTRL VIN 10μH VIN 3V TO 5V

3593 TA04a

1μF μF C1: TAIYO YUDEN EMK107BJ105MA C2: TAIYO YUDEN GMK316BJ105ML L1: MURATA LQH43CN100 D1: CENTRAL CMDSH05-4 CTRL VIN 10μH VIN 3V TO 5V

3593 TA05a

1μF μF C1: TAIYO YUDEN EMK107BJ105MA C2: TAIYO YUDEN GMK316BJ105ML L1: MURATA LQH43CN100 D1: CENTRAL CMDSH05-4 CTRL VIN 10μH VIN 3V TO 5V

3593 TA06a

1μF μF C1: TAIYO YUDEN EMK107BJ105MA C2: TAIYO YUDEN GMK316BJ105ML L1: MURATA LQH43CN100 D1: CENTRAL CMDSH05-4 Li-Ion Driver for Six White LEDs LED CURRENT (mA) EFFICIENCY (%)

3593 TA04b

VIN = 3.6V

3 LEDs

LED CURRENT (mA) EFFICIENCY (%)

3593 TA05b

VIN = 3.6V

4 LEDs

Effi ciency LED CURRENT (mA) EFFICIENCY (%)

3593 TA06b

VIN = 3.6V

6 LEDs

Li-Ion Driver For Ten White LEDs Effi ciency CTRL VIN 10μH VIN 3V TO 5V

3593 TA07a

1μF μF C1: TAIYO YUDEN EMK107BJ105MA C2: MURATA GRM31MR71H105KA88 L1: MURATA LQH43CN100 D1: CENTRAL CMDSH05-4 CTRL VIN 22μH VIN 3V TO 5V

3593 TA08a

1μF 2.2 μF C1: TAIYO YUDEN EMK107BJ105MA C2: MURATA GRM31CR71H225KA88 L1: MURATA LQH43CN220 D1: CENTRAL CMDSH05-4 LED CURRENT (mA) EFFICIENCY (%)

3593 TA07b

VIN = 3.6V Effi ciencyLi-Ion Driver For Ten White LEDs LED CURRENT (mA) EFFICIENCY (%)

3593 TA08b

VIN = 3.6V

2.00 ±0.10 (4 SIDES) 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 0.38 ± 0.05 BOTTOM VIEW—EXPOSED PAD 0.56 ± 0.05 (2 SIDES) 0.75 ±0.05 R = 0.115 TYP 1.37 ±0.05 (2 SIDES) PIN 1 BAR TOP MARK (SEE NOTE 6)

0.200 REF

0.00 – 0.05 (DC6) DFN 1103 0.25 ± 0.05

0.50 BSC

0.25 ± 0.05 1.42 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS 0.61 ±0.05 (2 SIDES)1.15 ±0.05 0.675 ±0.05 2.50 ±0.05 PACKAGE OUTLINE 6-Lead Plastic DFN (2mm × 2mm) (Reference L TC DWG # 05-08-1703)

(Reference L TC DWG # 05-08-1636) 1.50 – 1.75 (NOTE 4)2.80 BSC 0.30 – 0.45

6 PLCS (NOTE 3)

DATUM ‘A’ 0.09 – 0.20 (NOTE 3) S6 TSOT-23 0302 REV B

2.90 BSC

(NOTE 4)

0.95 BSC

1.90 BSC

0.80 – 0.90

1.00 MAX

0.01 – 0.100.20 BSC 0.30 – 0.50 REF PIN ONE ID 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

3.85 MAX

0.62 MAX 0.95 REF RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 1.4 MIN2.62 REF

1.22 REF

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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear .com © LINEAR TECHNOLOGY CORPORATION 2008 LT 0308 • PRINTED IN USA RELATED PARTS TYPICAL APPLICATION Li-Ion Driver for Six LEDs Effi ciency PART NUMBER DESCRIPTION COMMENTS L T1932 Constant Current, 1.2MHz, High Effi ciency White LED Boost Regulator Up to 8 White LEDs, VIN: 1V to 10V , VOUT(MAX) = 34V , IQ = 1.2mA, ISD < 1μA, ThinSOT TM Package L T1937 Constant Current, 1.2MHz, High Effi ciency White LED Boost Regulator Up to 4 White LEDs, VIN: 2.5V to 10V , VOUT(MAX) = 34V , IQ = 1.9mA, ISD < 1μA, ThinSOT and SC70 Packages LT C®3200 Low Noise, 2MHz Regulated Charge Pump White LED Driver Up to 6 White LEDs, VIN: 2.7V to 4.5V , IQ = 8mA, ISD < 1μA, MS Package L TC3200-5 Low Noise, 2MHz Regulated Charge Pump White LED Driver Up to 6 White LEDs, VIN: 2.7V to 4.5V , IQ = 8mA, ISD < 1μA, ThinSOT Package L TC3201 Low Noise, 1.7MHz Regulated Charge Pump White LED Driver Up to 6 White LEDs, VIN: 2.7V to 4.5V , IQ = 6.5mA, ISD < 1μA, MS Package L TC3202 Low Noise, 1.5MHz Regulated Charge Pump White LED Driver Up to 8 White LEDs, VIN: 2.7V to 4.5V , IQ = 5mA, ISD < 1μA, MS Package L TC3205 High Effi ciency, Multidisplay LED Controller Up to 4 (Main), 2 (Sub) and RGB, V IN: 2.8V to 4.5V , IQ = 50μA, ISD < 1μA, 24-Lead QFN Package L TC3210 Low Noise Charge Pump LED Controller Up to 4 White LEDs and One High current CAM LED, V IN: 2.9V to 4.5V , IQ = 4.5mA, ISD < 6μA, UD Package L T3465/L T3465A Constant Current, 1.2MHz/2.7MHz, High Effi ciency White LED Boost Regulator with Integrated Schottky Diode Up to 6 White LEDs, V IN: 2.7V to 16V , VOUT(MAX) = 34V , IQ = 1.9mA, ISD < 1μA, ThinSOT Package L T3466/L T3466-1 Dual Full Function, 2MHz Diodes White LED Step-Up Converter with Built-In Schottkys Up to 20 White LEDs, VIN: 2.7V to 24V , VOUT(MAX) = 39V , DFN and TSSOP-16 Packages L T3486 Dual 1.3A White LED Converter with 1000:1 T rue Color PWM Dimming Drives Up to 16 100mA White LEDs. VIN: 2.5V to 24V , VOUT(MAX) = 36V , DFN and TSSOP Packages L T3491 White LED Driver with Integrated Schottky Up to 6 White LEDs, V IN: 2.5V to 12V , IQ = 2.6mA, ISD < 10μA, SC70 and 2mm × 2mm DFN Packages L T3591 White LED Driver with Integrated Schottky Up to 10 White LEDs, V IN: 2.5V to 12V , IQ = 4mA, ISD < 11μA, 3mm × 2mm DFN Package ThinSOT is a trademark of Linear Technology Corporation. CTRL VIN 10μH VIN 3V TO 5V 1μF μF C1: TAIYO YUDEN EMK107BJ105MA C2: TAIYO YUDEN GMK316BJ105ML L1: MURATA LQH43CN100 D1: CENTRAL CMDSH05-4 LED CURRENT (mA) EFFICIENCY (%) VIN = 3.6V