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LT3593 1MHz White LED Driver with Output Disconnect and One Pin Current Programming FEATURES
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DESCRIPTION
The LT(R)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 x 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: 3A 1MHz Switching Frequency Requires Only 1F Output Capacitor Low Profile 6-Lead DFN (2mm x 2mm x 0.75mm) and 6-Lead SOT-23 Packages
APPLICATIONS
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Cell Phones Digital Cameras PDAs, Handheld Computers MP3 Players GPS Receivers
TYPICAL APPLICATION
Li-Ion Driver for Ten White LEDs
VIN 3V TO 5V 10H 1F VIN SW CAP LT3593 SHUTDOWN AND CURRENT CONTROL CTRL GND LED 1F 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
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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).................................................... -40C to 85C Maximum Junction Temperature........................... 125C Storage Temperature Range................... -65C to 150C Lead Temperature (Soldering, 10 sec) TSOT Package................................................... 300C
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 x 2mm) PLASTIC DFN TJMAX = 125C, JA = 106C/W EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB
S6 PACKAGE 6-LEAD PLASTIC TSOT-23 TJMAX = 125C, JA = 192C/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 x 2mm) Plastic DFN 6-Lead Plastic TSOT-23 TEMPERATURE RANGE -40C to 85C -40C to 85C
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 = 25C. 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 A A MHz % mA mV
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ELECTRICAL CHARACTERISTICS
2
LT3593
The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. 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 A mV A V V ns s s mA mA A 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
A V
Note 2: The LTC3593E is guaranteed to meet performance specifications from 0C to 85C operating junction temperature range. Specifications over the -40C to 85C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. Note 3: Guaranteed by design.
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LT3593 TYPICAL PERFORMANCE CHARACTERISTICS
Switch Saturation Voltage (VCESAT)
600 SWITCH SATURATION VOLTAGE (mV) 500 100C 400 25C 300 -50C 200 100 0 6 5 SHUTDOWN CURRENT (A) QUIESCENT CURRENT (mA) 100C 4 25C 3 2 1 0 0 100 300 500 200 400 SWITCH CURRENT (mA) 600
3593 G01
TA = 25C unless otherwise specified.
Shutdown Current (VCTRL = 0V)
3.50 3.25
Quiescent Current (VCTRL = 3.6V)
100C 3.00 25C 2.75 -50C 2.50 2.25 2.00
-50C
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 25C -50C VIN = 3.6V VCAP = 16V LED PIN CURRENT LIMIT (mA) 100C 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 1s/DIV FRONT PAGE APPLICATION CIRCUIT
3393 G07
Transient Response
VCTRL 5V/DIV IL 200mA/DIV
VCAP 10V/DIV VIN = 3.6V 200s/DIV FRONT PAGE APPLICATION CIRCUIT
3393 G08
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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 = 25C unless otherwise specified. Open-Circuit Output Clamp Voltage vs Temperature
40 VIN = 3.6V 39
Input Current in Output Open Circuit
39 25C 38 100C -50C
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
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LT3593 PIN FUNCTIONS
(DFN/TSOT)
VIN (Pin 1/Pin 3): Input Supply Pin. Must be locally bypassed with a 1F 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 128s (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 128s. If CTRL is held low for longer than 128s (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
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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 (625A - 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 625A each time. The desired current can be calculated by: ILED = 20mA - (N - 1) * 625A where N is the number of rising edges. When the desired current setting is reached, the CTRL pin must stay high. 128s 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 128s, 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 128s, 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
128s CTRL 20mA LED CURRENT 20mA
128s
128s
17.5mA
17.5mA SHDN
3593 F03
Figure 3. Current Programming and Shutdown Timing
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LT3593 APPLICATIONS INFORMATION
Inductor Selection A 10H 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 (H) 10 10 10 DCR () 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 1F input capacitor and a 1F output capacitor are sufficient for most applications.
PMEG4005AEA
500
50 at 1V
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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 10H C1 1F C3 1F VIN LT3593 CTRL GND
D1 C2 1F CAP
SW
3.3V IL 200mA/DIV
SHUTDOWN AND CURRENT CONTROL
LED
VCAP 20V/DIV
VSW 20V/DIV
3593 F05 VIN = 3.6V 400s/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
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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
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LT3593 TYPICAL APPLICATIONS
Li-Ion Driver for One White LED
70 C2 1F L1 10H C1 1F 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 1F L1 10H C1 1F 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
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LT3593 TYPICAL APPLICATIONS
Li-Ion Driver for Three White LEDs
L1 10H VIN 3V TO 5V C1 1F
Efficiency
90 VIN = 3.6V 3 LEDs
D1 C2 1F
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 10H VIN 3V TO 5V C1 1F D1 C2 1F
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 10H VIN 3V TO 5V C1 1F
Efficiency
90 VIN = 3.6V 6 LEDs
D1 C2 1F
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
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LT3593 TYPICAL APPLICATIONS
Li-Ion Driver For Ten White LEDs
L1 10H VIN 3V TO 5V C1 1F 90 D1 80 EFFICIENCY (%) VIN SW CAP LT3593 SHUTDOWN AND CURRENT CONTROL CTRL GND 40 30 LED C2 1F 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 22H VIN 3V TO 5V C1 1F 90 D1 80 EFFICIENCY (%) VIN SW CAP LT3593 SHUTDOWN AND CURRENT CONTROL CTRL GND 40 30 LED C2 2.2F 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
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LT3593 PACKAGE DESCRIPTION
DC Package 6-Lead Plastic DFN (2mm x 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
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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
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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.
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LT3593 TYPICAL APPLICATION
Li-Ion Driver for Six LEDs
L1 10H VIN 3V TO 5V C1 1F
Efficiency
90 VIN = 3.6V 6 LEDs
D1 C2 1F
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(R)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 < 1A, ThinSOTTM Package Up to 4 White LEDs, VIN: 2.5V to 10V, VOUT(MAX) = 34V, IQ = 1.9mA, ISD < 1A, ThinSOT and SC70 Packages Up to 6 White LEDs, VIN: 2.7V to 4.5V, IQ = 8mA, ISD < 1A, MS Package Up to 6 White LEDs, VIN: 2.7V to 4.5V, IQ = 8mA, ISD < 1A, ThinSOT Package Up to 6 White LEDs, VIN: 2.7V to 4.5V, IQ = 6.5mA, ISD < 1A, MS Package Up to 8 White LEDs, VIN: 2.7V to 4.5V, IQ = 5mA, ISD < 1A, MS Package Up to 4 (Main), 2 (Sub) and RGB, VIN: 2.8V to 4.5V, IQ = 50A, ISD < 1A, 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 < 6A, UD Package Up to 6 White LEDs, VIN: 2.7V to 16V, VOUT(MAX) = 34V, IQ = 1.9mA, ISD < 1A, 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 < 10A, SC70 and 2mm x 2mm DFN Packages Up to 10 White LEDs, VIN: 2.5V to 12V, IQ = 4mA, ISD < 11A, 3mm x 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
(c) LINEAR TECHNOLOGY CORPORATION 2008

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