LTC3458L Datasheet, PDF (16/16 Pages) Linear Technology – 1.7A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect

LTC3458L
TYPICAL APPLICATIO
2 ALKALINE
1.8V TO 3.3V
High Current LED Driver with BURST Pin Current Regulation
L1
+
–
V_IN
SW
C_IN
LTC3458L
2.2µF
GND/PGND
V_OUT
ON OFF
SHDN
FB
f_OSC = 750kHz
Z1
V_OUT
3V TO 3.5V
SYNC
COMP
D1
R_T
SS
0.01µF
33k
0.01µF
274k
I_LIM
84.5k
BURST
R_BURST
0.01µF
C_OUT
2.2µF
C_IN, C_OUT: TAIYO YUDEN JMK107BJ225MA
D1: LUXEON EMITTER LUMILED WHITE
LXHLMW1D
L1: Coilcraft 10µH MSS7341
R_BURST: 45.3k FOR 300mA,
82.5k FOR 150mA,
3458L TA06a
232k FOR 50mA
Z1: CENTRAL SEMI 6.8V ZENER DIODE SOT-23 CMPZ5235B
Two Alkaline Cells Powering
a 1-Watt Lumiled
100
50mA, 3V
90
150mA, 3.2V
80
300mA, 3.5V
70
60
NOTE: LUMILED CURRENT REGULATION
~20% OVER V_IN RANGE
50
1.8
2.3
2.8
3.3
INPUT VOLTAGE (V)
3458L TA06b
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V_IN: 0.5V to 5V, V_OUT(MAX) = 6V, I_Q = 38µA I_SD < 1µA, MS10
V_IN: 0.5V to 4.5V, V_OUT(MAX) = 2.4V to 5.25V
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V_IN: 1.5V to 6V, V_OUT(MAX) = Up to 7.5V
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85mA I_SW, Constant Off-Time, High Efficiency Step-Up DC/DC
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ThinSOT
3458lf
16 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
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LT/TP 0505 500 • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2005