LTC3458
16
3458fa
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2004
LT0807 REV A • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATIO
U
PART NUMBER DESCRIPTION COMMENTS
LT1310 1.5A I
SW
, 4.5MHz, High Efficiency Step-Up DC/DC Converter V
IN
: 2.75V to 18V, V
OUT(MAX)
= 35V, I
Q
= 12mA, I
SD
< 1μA,
MS10E
LT1613 550mA I
SW
, 1.4MHz, High Efficiency Step-Up DC/DC Converter V
IN
: 0.9V to 10V, V
OUT(MAX)
= 34V, I
Q
= 3mA, I
SD
< 1μA, ThinSOT
LT1615/ 300mA/80mA I
SW
, Constant Off-Time, High Efficiency V
IN
: 1.2V to 15V, V
OUT(MAX)
= 34V, I
Q
= 20μA, I
SD
< 1μA,
LT1615-1 Step-Up DC/DC Converter ThinSOT
LT1618 1.5A I
SW
, 1.4MHz, High Efficiency Step-Up DC/DC Converter V
IN
: 1.6V to 18V, V
OUT(MAX)
= 35V, I
Q
= 1.8mA, I
SD
< 1μA, MS10
LT1944 (Dual) Dual Output 350mA I
SW
, Constant Off-Time, High Efficiency V
IN
: 1.2V to 15V, V
OUT(MAX)
= 34V, I
Q
= 20μA, I
SD
< 1μA, MS10
Step-Up DC/DC Converter
LT1945 (Dual) Dual Output Pos/Neg 350mA I
SW
, Constant Off-Time, V
IN
: 1.2V to 15V, V
OUT(MAX)
= ±34V, I
Q
= 20μA, I
SD
< 1μA, MS10
High Efficiency Step-Up DC/DC Converter
LT1946/LT1946A 1.5A I
SW
, 1.2MHz/2.7MHZ, High Efficiency Step-Up V
IN
: 2.45V to 16V, V
OUT(MAX)
= 34V, I
Q
= 3.2mA, I
SD
< 1μA, MS8
DC/DC Converter
LT1949/ 550mA I
SW
, 600kHz/1.1MHz, High Efficiency Step-Up V
IN
: 1.5V to 12V, V
OUT(MAX)
= 28V, I
Q
= 4.5mA, I
SD
< 25μA, SO-8,
LT1949-1 DC/DC Converter MS8
LT1961 1.5A I
SW
, 1.25MHz, High Efficiency Step-Up DC/DC Converter V
IN
: 3V to 25V, V
OUT(MAX)
= 35V, I
Q
= 0.9mA, I
SD
< 6μA, MS8E
LTC3400/ 600mA I
SW
, 1.2MHz, Synchronous Step-Up DC/DC Converter V
IN
: 0.5V to 5V, V
OUT(MAX)
= 5V, I
Q
= 19μA/300μA I
SD
< 1μA,
LTC3400B ThinSOT
LTC3401 1A I
SW
, 3MHz, Synchronous Step-Up DC/DC Converter V
IN
: 0.5V to 5V, V
OUT(MAX)
= 6V, I
Q
= 38μA I
SD
< 1μA, MS10
LTC3402 2A I
SW
, 3MHz, Synchronous Step-Up DC/DC Converter V
IN
: 0.5V to 5V, V
OUT(MAX)
= 6V, I
Q
= 38μA I
SD
< 1μA, MS10
LTC3425 5A I
SW
, 8MHz, 4-Phase Synchronous Step-Up DC/DC Converter V
IN
: 0.5V to 4.5V, V
OUT(MAX)
= 5.25V, I
Q
= 12μA, I
SD
< 1μA,
QFN32
LTC3429 600mA, 500kHz, Synchronous Step-Up DC/DC Converter V
IN
: 0.5V to 5V, V
OUT(MAX)
= 5V, I
Q
= 20μA/300μA I
SD
< 1μA,
with Output Disconnect and Soft-Start ThinSOT
LTC3459 70mA I
SW
, 10V Micropower Synchronous Boost/Output Disconnect V
IN
: 1.5V to 5.5V, V
OUT(MAX)
= 10V, I
Q
= 10μA, ThinSOT
LT3460 320mA I
SW
, 1.3MHz, High Efficiency Step-Up DC/DC Converter V
IN
: 2.5V to 16V, V
OUT(MAX)
= 36V, I
Q
= 2mA, I
SD
< 1μA, SC70,
ThinSOT
LT3464 85mA I
SW
, Constant Off-Time, High Efficiency Step-Up DC/DC V
IN
: 2.3V to 10V, V
OUT(MAX)
= 34V, I
Q
= 25μA, I
SD
< 1μA,
Converter with Integrated Schottky/Output Disconnect ThinSOT
Dual Lumiled Application with BURST Pin Current Regulation
V
IN
GND/PGND
SHDN
SYNC
R
T
I
LIM
SW
V
OUT
FB
COMP
SS
BURST
LTC3458
Li-Ion
2.7V to 4.2V
C
IN
2.2μF
L1
Z1
D1
D2
ON OFF
243k 124k R
BURST
33k
0.01μF
0.01μF
0.01μF
C
OUT
2.2μF
V
OUT
6.4V TO 6.8V
3458 TA06a
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,
82.5k FOR 150mA
Z1: CENTRAL SEMI 6.8V ZENER DIODE SOT-23 CMPZ5235B
f
OSC
= 850kHz
INPUT VOLTAGE (V)
EFFICIENCY (%)
100
90
80
70
60
50
2.5
3.5
4.0
3458 TA06b
2.0
3.0
4.5
5.0 5.5
350mA, 6.8V
150mA, 6.4V
250mA, 6.6V
NOTE: LUMILED CURRENT REGULATION
~10% OVER V
IN
RANGE
2-Lumileds in Series
