Datasheet

LTC3824
14
3824fg
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
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FAX: [phone]
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www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2006
LT 0311 REV G • PRINTED IN USA
relaTeD parTs
Typical applicaTion
3V 2A Buck Converter
3824 TA02a
15k
80.6k
C
CAP
0.1µF
255k
100pF
51Ω
C
OUT
270µF
1µF
16V
L1
33µH
V
OUT
3.3V
2A
0.1µF
301k
C
IN1
33µF
100V
C
IN2
2.2µF
100V
1000pF
LTC3824
SENSESYNC/MODE
GATE
V
FB
V
C
V
CC
R
SET
GND
SS
V
IN
4.5V TO 60V
D1
Q1
+
+
R
S
0.025Ω
100pF
C
IN1
: SANYO 63MV68AX
C
IN2
: TDK C4532X7R2A225M
C
OUT
: SANYO OSCON, 16SP270M, TDKC2012X7RIC105K
L1: D104C919AS-330M
D1: SS3H9
Q1: Si7465DP
CAP
PART NUMBER DESCRIPTION COMMENTS
LTC3891 60V, Low I
Q
Synchronous Step-Down DC/DC Controller with
99% Duty Cycle and Low 95ns Minimum On-Time
PLL Capable Fixed Operating Frequency 50kHz to 900kHz,
4V ≤ V
IN
≤ 60V, 0.8V ≤ V
OUT
≤ 24V, I
Q
= 50µA
LT3845A 60V, Low I
Q
Synchronous Step-Down DC/DC Controller Adjustable Fixed Operating Frequency 100kHz to 500kHz,
4V ≤ V
IN
≤ 60V, 1.23V ≤ V
OUT
≤ 36V, I
Q
= 120µA, TSSOP-16E
LTC3812-5 60V Synchronous Step-Down DC/DC Controller Constant On-Time Valley Current Mode, 4V ≤ V
IN
≤ 60V,
0.8V ≤ V
OUT
≤ 0.93V
IN
, TSSOP-16E
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
LTC3890/LTC3890-1 60V, Low I
Q
, Dual 2-Phase Synchronous Step-Down DC/DC
Controllers with 99% Duty Cycle and 95ns Minimum On-Time
PLL Fixed Frequency 50kHz to 900kHz, 4V ≤ V
IN
≤ 60V,
0.8V ≤ V
OUT
≤ 24V, I
Q
= 50µA
LTC3834/LTC3834-1
LTC3835/LTC3835-1
Low I
Q
, Single Output Synchronous Step-Down DC/DC
Controllers with 99% Duty Cycle
PLL Fixed Frequency 140kHz to 650kHz, 4V ≤ V
IN
≤ 36V,
0.8V ≤ V
OUT
≤ 10V, I
Q
= 30µA/80µA
LTC3857/LTC3857-1
LTC3858/LTC3858-1
Low I
Q
, Dual Output 2-Phase Synchronous Step-Down DC/DC
Controllers with 99% Duty Cycle
PLL Fixed Frequency 50kHz to 900kHz, 4V≤ V
IN
≤ 38V,
0.8V ≤ V
OUT
≤ 24V, I
Q
= 50µA/170µA
LTC3859 Low I
Q
, Triple Output Buck/Buck/Boost Synchronous DC/DC
Controller
All Outputs Remain in Regulation Through Cold Crank,
2.5V ≤ V
IN
≤ 38V, V
OUT(BUCK)
Up to 24V, V
OUT(BOOST)
Up to 60V,
I
Q
= 55µA