LTC3458_15 Datasheet, PDF (16/16 Pages) Linear Technology – 1.4A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect

LTC3458
TYPICAL APPLICATIO
Dual Lumiled Application with BURST Pin Current Regulation
L1
Li-Ion
2.7V to 4.2V
C_IN
2.2μF
V_IN
SW
LTC3458
GND/PGND
V_OUT
ON OFF
SHDN
FB
f_OSC = 850kHz
Z1
V_OUT
6.4V TO 6.8V
243k
SYNC
R_T
I_LIM
124k
COMP
SS
BURST
0.01μF
0.01μF
R_BURST
D1
33k
D2
0.01μF
C_OUT
2.2μF
C_IN, C_OUT: TAIYO YUDEN JMK107BJ225MA
D1, D2: LUXEON EMITTER LUMILED WHITE
LXHLMW1D (2.9V AT 350mA)
L1: Wurth 12μH 774775112
R_BURST: 35.7k FOR 350mA,
47.5k FOR 250mA,
3458 TA06a
82.5k FOR 150mA
Z1: CENTRAL SEMI 6.8V ZENER DIODE SOT-23 CMPZ5235B
2-Lumileds in Series
100
90
150mA, 6.4V
250mA, 6.6V
80
350mA, 6.8V
70
60
NOTE: LUMILED CURRENT REGULATION
~10% OVER V_IN RANGE
50
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
3458 TA06b
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PART NUMBER DESCRIPTION
COMMENTS
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LT1949/
LT1949-1
550mA I_SW, 600kHz/1.1MHz, High Efficiency Step-Up
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LTC3400/
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V_IN: 3V to 25V, V_OUT(MAX) = 35V, I_Q = 0.9mA, I_SD < 6μA, MS8E
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V_IN: 0.5V to 4.5V, V_OUT(MAX) = 5.25V, I_Q = 12μA, I_SD < 1μA,
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LT3460
70mA I_SW, 10V Micropower Synchronous Boost/Output Disconnect V_IN: 1.5V to 5.5V, V_OUT(MAX) = 10V, I_Q = 10μA, ThinSOT
320mA I_SW, 1.3MHz, High Efficiency Step-Up DC/DC Converter
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LT3464
85mA I_SW, Constant Off-Time, High Efficiency Step-Up DC/DC
Converter with Integrated Schottky/Output Disconnect
V_IN: 2.3V to 10V, V_OUT(MAX) = 34V, I_Q = 25μA, I_SD < 1μA,
ThinSOT
3458fa
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1630 McCarthy Blvd., Milpitas, CA 95035-7417
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LT0807 REV A • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2004