LT3743 Datasheet, PDF (2/28 Pages) Linear Technology – High Current Synchronous Step-Down LED Driver with Three-State Control

LT3743
ABSOLUTE MAXIMUM RATINGS (Note 1)
V_IN Voltage................................................................40V
EN/UVLO Voltage ........................................................6V
V_REF Voltage................................................................3V
CTRL_L, CTRL_H, CTRL_T Voltage ............................3V
PWM, CTRL_SEL Voltage ...........................................6V
SENSE⁺ Voltage ........................................................40V
SENSE^– Voltage ........................................................40V
VCH, VCL Voltage .......................................................3V
SW Voltage ...............................................................40V
CBOOT ......................................................................46V
RT Voltage...................................................................3V
FB Voltage...................................................................3V
SS Voltage ..................................................................6V
SYNC Voltage..............................................................6V
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
TSSOP .............................................................. 300°C
PIN CONFIGURATION
TOP VIEW
28 27 26 25 24 23
GND 1
22 PWMGL
EN/UVLO 2
21 GND
V_REF 3
CTRL_T 4
GND 5
20 GND
29
19 PWMGH
GND
18 PWM
CTRL_H 6
17 CTRL_SEL
CTRL_L 7
16 SYNC
SS 8
15 RT
9 10 11 12 13 14
UFD PACKAGE
28-LEAD (4mm s 5mm) PLASTIC QFN
T_JMAX = 125°C, θ_JA = 37°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
V_{CC_INT} 1
GND 2
28 LG
27 GND
V_IN 3
EN/UVLO 4
26 CBOOT
25 SW
V_REF 5
CTRL_T 6
24 HG
23 PWMGL
GND 7
CTRL_H 8
29
22 GND
GND
21 PWMGH
CTRL_L 9
20 PWM
SS 10
19 CTRL_SEL
GND 11
18 SYNC
FB 12
SENSE⁺ 13
SENSE^– 14
17 RT
16 VCH
15 VCL
FE PACKAGE
28-LEAD PLASTIC TSSOP
T_JMAX = 125°C, θ_JA = 30°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3743EUFD#PBF
LT3743EUFD#TRPBF
3743
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LT3743IUFD#PBF
LT3743IUFD#TRPBF
3743
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LT3743EFE#PBF
LT3743EFE#TRPBF
LT3743FE
28-Lead Plastic TSSOP
–40°C to 125°C
LT3743IFE#PBF
LT3743IFE#TRPBF
LT3743FE
28-Lead Plastic TSSOP
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
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/
3743f
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