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| LTC3114-1_15 Datasheet, PDF (30/34 Pages) Linear Technology – 40V, 1A Synchronous Buck-Boost DC/DC Converter with Programmable Output Current | |||
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LTC3114-1
TYPICAL APPLICATIONS
Constant Current High Brightness LED Driver
15µH
68nF
VIN
9V TO 40V
10µF
500mA: R1 = 49.9k
350mA: R1 = 71.5k
ADJUST R1 FOR DIMMING
R1
71.5k
3.3nF
SW1
SW2
BST1
BST2
LTC3114-1
VIN
PVOUT
PVIN
LDO
RUN
PLDO
PROG
MODE
GND
FB
VC
PGND
INDUCTOR: WÃRTH 744 066 150
D1: ON SEMI MBRS260T3G
500mA CONSTANT CURRENT, VIN > 11V
68nF
350mA CONSTANT CURRENT, VIN > 9V
D1
CONSTANT CURRENT DOWN
TO 2V
44µF
4.7µF 1M
0.47µF
31.6k
71.5k
31141 TA05a
VOLTAGE DIVIDER LIMITS VOUT
TO 15V IN CASE OF OPEN LED
Efficiency vs Input Voltage, 350mA Drive Current
95
94
93
92
91
90
89
88
87
86
85
8 12 16 20 24 28 32 36 40
INPUT VOLTAGE (V)
31141 TA05b
30
For more information www.linear.com/LTC3114-1
31141fa
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