Datasheet

LTC3864
28
3864f
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
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www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2012
LT 1012 • PRINTED IN USA
LOAD CURRENT (A)
0.01
40
EFFICIENCY (%)
80
70
60
50
90
0.1 1
3864 TA05b
PULSE-SKIPPING
Burst Mode
OPERATION
V
IN
= 12V
V
OUT
= 3.3V
RELATED PARTS
TYPICAL APPLICATION
PART NUMBER DESCRIPTION COMMENTS
LTC3891 60V, Low I
Q
, Synchronous Step-Down DC/DC
Controller
Phase-Lockable Fixed Frequency 50kHz to 900kHz 4V ≤ V
IN
≤ 60V,
0.8V ≤ V
OUT
≤ 24V, I
Q
= 50µA
LTC3890 60V, Low I
Q
, Dual 2-Phase Synchronous
Step-Down DC/DC Controller
Phase-Lockable Fixed Frequency 50kHz to 900kHz 4V ≤ V
IN
≤ 60V,
0.8V ≤ V
OUT
≤ 24V, I
Q
= 50µA
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
LT3845A 60V, Low I
Q
, Single Output Step-Down DC/DC
Controller
Synchronizable Fixed Frequency 100kHz to 600kHz 4V ≤ V
IN
≤ 60V,
1.23V ≤ V
OUT
≤ 36V, I
Q
= 120µA, TSSOP-16
LTC3834/LTC3834-1
LTC3835/LTC3835-1
Low I
Q
, Single Output Synchronous Step-Down
DC/DC Controller with 99% Duty Cycle
Phase-Lockable 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
Phase-Lockable Fixed Frequency 50kHz to 900kHz, 4V ≤ V
IN
≤ 38V,
0.8V ≤ V
OUT
≤ 24V, I
Q
= 50µA/170µA
LTC3859A 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(BUCKS)
Up to 24V, V
OUT(BOOST)
Up to 60V, I
Q
= 55µA
3.5V to 38V Input, 3.3V/3A Output at 300kHz
Efficiency
R
PGD
100k
MP
D1
L1
6.8µH
CAP
C
CAP
0.1µF
C
VIN
0.1µF
C
IN1
33µF
63V
PGND
LTC3864
3864 TA05a
SS
ITH
FREQ
SGND
RUN
V
IN
MODE/PLLN
SENSE
GATE
PGOOD
V
FB
R
SENSE
20mΩ
R
ITH
20k
R
FREQ
42.2k
R
FB2
634k
47µF
×2
V
OUT
3.3V
3A
R
FB1
200k
V
IN
3.5V TO 60V
C
ITH1
10nF
C
ITH2
100pF
C
SS
0.1µF
+
C
IN2
10µF
×2
C
IN1
: SANYO 63ME33AX
D1: VISHAY V15P45S
L1: WÜRTH 7447709100
MP: VISHAY/SILICONIX Si7611DN