LTC3812-5
34
38125fc
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2007
LT 0111 REV C • PRINTED IN USA
PART NUMBER DESCRIPTION COMMENTS
LTC3891 60V, Low I
Q
, Synchronous Step-Down DC/DC Controller PLL Fixed Frequency 50kHz to 900kHz
4V ≤ V
IN
≤ 60V, 0.8V ≤ V
OUT
≤ 24V, TSSOP-20E, 3 × 4 QFN-20
LTC3890 60V, Low I
Q
, Dual Output 2-Phase Synchronous
Step-Down DC/DC Controller
PLL Fixed Frequency 50kHz to 900kHz
4V ≤ V
IN
≤ 60V, 0.8V ≤ V
OUT
≤ 24V, 5 × 5 QFN-32
LTC3810 100V Synchronous Step-Down DC/DC Controller Constant On-time Valley Current Mode
4V ≤ V
IN
≤ 60V, 0.8V ≤ V
OUT
≤ 0.93V
IN
, SSOP-28
LTC3810-5 60V Synchronous Step-Down DC/DC Controller Constant On-time Valley Current Mode
4V ≤ V
IN
≤ 60V, 0.8V ≤ V
OUT
≤ 0.93V
IN
, 5 × 5 QFN-32
LTC3703 100V Synchronous Step-Down DC/DC Controller PLL Fixed Frequency 100kHz to 600kHz
4V ≤ V
IN
≤ 100V, 0.8V ≤ V
OUT
≤ 0.93V
IN
, SSOP-16, SSOP-28
LT3845A 60V, Low I
Q
, Single Output Synchronous
Step-Down DC/DC Controller
Adjustable Fixed Frequency 100kHz to 500kHz,
4V≤ V
IN
≤ 60V, 1.23V ≤ V
OUT
≤ 36V, TSSOP-16E
LTC3824 60V, Low I
Q
, Step-Down DC/DC Controller, 100% Duty Cycle Selectable Fixed Frequency 200kHz to 600kHz
4V≤ V
IN
≤ 60V, 0.8V ≤ V
OUT
≤ V
IN
, I
Q
= 40μA, MSOP-10E
TYPICAL APPLICATION
15V to 60V Input Voltage to 12V/5A with Trickle Charger Start-Up
PGOOD
FCB
PGOOD
V
RNG
I
TH
SGND
V
FB
SGND PGND
PGND
RUN/SS
I
ON
C
ON
100pF
C
SS
1000pF
V
IN
15V TO 60V
V
OUT
12V
5A
C
C2
47pF
R
C
200k
R
FB2
1k
R
FB1
14k
LTC3812-5
EXTV
CC
TG
SW
BG
PGND
INTV
CC
NDRV
BOOST
38125 TA04
C
B
0.1μF
C
DRVCC
0.1μF
C
VCC
1μF
R
ON
261k
R
NDRV
250k
D
B
BAS19
M1
Si7850DP
M2
Si7850DP
C5
22
μF
D1
B1100
C
OUT1
270μF
16V
C
OUT2
10μF
16V
L1
10
μH
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
C
C1
5pF
C
IN1
68μF
100V
C
IN2
1μF
100V
RELATED PARTS
