LT1936
20
1936fd
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2006
LT 1108 REV D • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
2.5V Step-Down Converter Minimum Input Voltage
PART NUMBER DESCRIPTION COMMENTS
LT1676 60V, 440mA (I
OUT
), 100kHz, High Effi ciency Step-Down
DC/DC Converter
V
IN
: 7.4V to 60V, V
OUT(MIN)
= 1.24V, I
Q
= 3.2mA, I
SD
= 2.5μA,
SO-8 Package
LT1765 25V, 2.75A (I
OUT
), 1.25MHz, High Effi ciency Step-Down
DC/DC Converter
V
IN
: 3V to 25V, V
OUT(MIN)
= 1.20V, I
Q
= 1mA, I
SD
= 15μA,
SO-8 and 16-Lead TSSOPE Packages
LT1766 60V, 1.2A (I
OUT
), 200kHz, High Effi ciency Step-Down
DC/DC Converter
V
IN
: 5.5V to 60V, V
OUT(MIN)
= 1.20V, I
Q
= 2.5mA, I
SD
= 25μA,
16-Lead TSSOP/TSSOPE Packages
LT1767 25V, 1.2A (I
OUT
), 1.25MHz, High Effi ciency Step-Down
DC/DC Converter
V
IN
: 3V to 25V, V
OUT(MIN)
= 1.20V, I
Q
= 1mA, I
SD
= 6μA,
MS8/MS8E Packages
LT1776 40V, 550mA (I
OUT
), 200kHz, High Effi ciency Step-Down
DC/DC Converter
V
IN
: 7.4V to 40V, V
OUT(MIN)
= 1.24V, I
Q
= 3.2mA, I
SD
= 30μA,
N8/SO-8 Packages
LT1933 600mA, 500kHz, Step-Down Switching Regulator in SOT-23 V
IN
: 3.6V to 36V, V
OUT(MIN)
= 1.25V, I
Q
= 1.6mA, I
SD
< 1μA,
ThinSOT™ Package
LT1940 25V, Dual 1.4A (I
OUT
), 1.1MHz, High Effi ciency Step-Down
DC/DC Converter
V
IN
: 3V to 25V, V
OUT(MIN)
= 1.2V, I
Q
= 3.8mA, I
SD
< 1μA,
16-Lead TSSOPE Package
LT1956 60V, 1.2A (I
OUT
), 500kHz, High Effi ciency Step-Down
DC/DC Converter
V
IN
: 5.5V to 60V, V
OUT(MIN)
= 1.20V, I
Q
= 2.5mA, I
SD
= 25μA,
16-Lead TSSOP/TSSOPE Packages
LT1976 60V, 1.2A (I
OUT
), 200kHz, High Effi ciency Step-Down
DC/DC Converter with Burst Mode
®
Operation
V
IN
: 3.3V to 60V, V
OUT(MIN)
= 1.20V, I
Q
= 100μA, I
SD
< 1μA,
16-Lead TSSOPE Package
LT3010 80V, 50mA, Low Noise Linear Regulator V
IN
: 1.5V to 80V, V
OUT(MIN)
= 1.28V, I
Q
= 30μA, I
SD
< 1μA,
MS8E Package
LT C
®
3407 Dual 600mA (I
OUT
), 1.5MHz, Synchronous Step-Down
DC/DC Converter
V
IN
: 2.5V to 5.5V, V
OUT(MIN)
= 0.6V, I
Q
= 40μA, I
SD
< 1μA,
10-Lead MSE Package
LTC3412 2.5A (I
OUT
), 4MHz, Synchronous Step-Down DC/DC
Converter
V
IN
: 2.5V to 5.5V, V
OUT(MIN)
= 0.8V, I
Q
= 60μA, I
SD
< 1μA,
16-Lead TSSOPE Package
LTC3414 4A (I
OUT
), 4MHz, Synchronous Step-Down DC/DC Converter V
IN
: 2.3V to 5.5V, V
OUT(MIN)
= 0.8V, I
Q
= 64μA, I
SD
< 1μA,
20-Lead TSSOPE Package
LT3430/LT3431 60V, 2.75A (I
OUT
), 200kHz/500kHz, High Effi ciency
Step-Down DC/DC Converters
V
IN
: 5.5V to 60V, V
OUT(MIN)
= 1.20V, I
Q
= 2.5mA, I
SD
= 30μA,
16-Lead TSSOPE Package
Burst Mode is a registered trademark of Linear Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation.
V
IN
3.6V TO 20V
ON OFF
D1
D2
L1
8.2μH
D1: DFLS140L
D2: 1N4148
L1: TOKO D63CB
C2
47μF
1936 TA09a
C1
4.7μF
C3
0.22μF
V
OUT
2.5V
1.3A
V
IN
BOOST
V
C
GND
COMP FB
LT1936
SHDN SW
R2
10k
R1
11k
LOAD CURRENT (mA)
1
INPUT VOLTAGE (V)
4.5
5.0
1936 TA09b
4.0
3.5
3.0
10
100
1000
5.5
V
OUT
= 2.5V
CONNECTING THE BOOST CIRCUIT TO THE
INPUT LOWERS THE MINIMUM INPUT
VOLTAGE TO RUN AND TO START TO LESS
THAN 3.7V AT ALL LOADS
