Datasheet

LTC3859A
44
3859af
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 2011
LT 0811 • PRINTED IN USA
relaTeD parTs
PART NUMBER DESCRIPTION COMMENTS
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
LTC3890/LTC3890-1 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
LTC3789 4-Switch High Efficiency Buck-Boost Controller 4V ≤ V
IN
≤ 38V, 0.8V ≤ V
OUT
≤ 38V, SSOP-28, 4mm × 5mm QFN-28
LTC3834/LTC3834-1
LTC3835/LTC3835-1
Low I
Q
, 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
LTC3891 60V, Low I
Q
, Synchronous Step-Down DC/DC Controller
with 99% Duty Cycle
PLL Fixed Frequency 50kHz to 900kHz, 4V ≤ V
IN
≤ 60V,
0.8V ≤ V
OUT
≤ 24V, TSSOP-20E, 3mm × 4mm QFN-20
LTC3824 Low I
Q
, High Voltage DC/DC Controller, 100% Duty Cycle Selectable Fixed 200kHz to 600kHz Operating Frequency,
4V ≤ V
IN
≤ 60V, 0.8V ≤ V
OUT
≤ V
IN
, I
Q
= 40µA, MSOP-10E
Typical applicaTion
High Efficiency Wide Input Range Dual 3.3V/8.5V Converter
3859A TA02
LTC3859A
SENSE1
–
SENSE1
+
PGOOD1
TG1
SW1
BOOST1
BG1
V
BIAS
PGND
INTV
CC
TG2
BOOST2
SW2
BG2
SENSE2
+
SENSE2
–
TG3
SW3
BOOST3
BG3
SENSE3
–
SENSE3
+
V
FB1
I
TH1
TRACK/SS1
FREQ
PLLIN/MODE
SGND
RUN1
RUN2
RUN3
V
FB2
I
TH2
TRACK/SS2
V
FB3
I
TH3
SS3
C1
1nF
100k
C
B1
0.1µF
D1
D2
C
BIAS
10µF
C
INT1
4.7µF
C2
1nF
MTOP1
MBOT1
C1
10µF
L1
3.2µH
R
SENSE1
6mΩ
C
OUT1
150µF
V
OUT1
3.3V
5A
MTOP2
MBOT2
C2
10µF
L2
6.5µH
R
SENSE2
8mΩ
C
OUT2
68µF
V
OUT2
8.5V
3A
C
B2
0.1µF
MTOP3
MBOT3
L3
1.2µH
R
SENSE2
2mΩ
C3
1nF
D3
C
B3
0.1µF
C
IN
220µF
V
IN
2.5V TO 38V
(START-UP ABOVE 5V)
* V
OUT3
IS 10V WHEN V
IN
< 10V,
FOLLOWS V
IN
WHEN V
IN
> 10V
C
OUT3
220µF
R
B1
215k
15pF
V
OUT1
R
A1
68.1k
R
B2
649k
10pF
V
OUT2
R
A2
68.1k
C
ITH1A
150pF
C
ITH1
820pF
R
ITH1
15k
C
ITH2A
68pF
C
ITH2
2.2nF
C
SS2
0.1µF
R
ITH2
15k
R
B3
499k
OPT
V
OUT3
V
OUT2
R
A3
68.1k
C
ITH3A
820pF
C
ITH3
0.01µF
C
SS3
0.1µF
R
ITH3
3.6k
C
SS1
0.1µF
MTOP1, MTOP2: VISHAY Si7848DP
MBOT1, MBOT2: BSZ097NO4LS
MTOP3: BSC027NO4LS
MBOT3: BSCO1BN04LS
L1: SUMIDA CDEP105-3R2M
L2: WÜRTH 744314650
L3: WÜRTH 744325120
C
OUT1
: SANYO 6TPB220ML
C
OUT2
: SANYO 4TPE150M
C
IN
, C
OUT3
: SANYO 50CE220LX
D1, D2: CMDH-4E
D3: BAS140W
V
OUT3
10V*
OV3
EXTV
CC