LTC3857IUH#TRPBF Linear Technology, LTC3857IUH#TRPBF Datasheet - Page 38

• Manufacturer Part Number: LTC3857IUH#TRPBF
• Description: IC CTRLR STP-DN SYNC DUAL 32QFN
• Manufacturer: Linear Technology
• Series: PolyPhase®r
• Type: Step-Down (Buck)r

Specifications of LTC3857IUH#TRPBF

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 0.8 ~ 24 V
• Frequency - Switching: 50kHz ~ 900kHz
• Voltage - Input: 4 ~ 38 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 32-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Power - Output: -

LTC3857
TYPICAL APPLICATION
RELATED PARTS
PART NUMBER
LTC3859
LTC3868/LTC3868-1
LTC3858/LTC3858-1
LTC3890/LTC3890-1
LTC3834/LTC3834-1
LTC3835/LTC3835-1
LT3845A
LTC3824
38
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
C
49.9k
R
ITH1A
A1
C
ITH1
68pF
3300pF
698k
10pF
R
C
B1
F1
R
DESCRIPTION
Low I
DC/DC Controller
Low I
Step-Down DC/DC Controller with 99% Duty Cycle
Low I
Step-Down DC/DC Controller with 99% Duty Cycle
60V, Low I
DC/DC Controller with 99% Duty Cycle
Low I
Low I
Low I
DC/DC Controller
Low I
Duty Cycle
ITH1
●
C
1nF
2.94k
SS1
Q
Q
Q
Q
Q
Q
Q
C1
FAX: [phone]
, Triple Output Buck/Buck-Boost Synchronous
, Dual Output 2-Phase Synchronous
, Dual Output 2-Phase Synchronous
, Synchronous Step-Down DC/DC Controller
, Synchronous Step-Down DC/DC Controller
, High Voltage Synchronous Step-Down
, High Voltage DC/DC Controller, 100%
V
V
OUT
SS1
I
0.1μF
FB1
TH1
Q
C2
1nF
, Dual 2-Phase Synchronous Step-Down
V
I
TRACK/SS1
I
PHSMD
CLKOUT
PLLIN/MODE
SGND
I
SENSE1
SENSE1
EXTV
RUN1
RUN2
FREQ
SS2
V
SENSE2
SENSE2
TH1
LIM
TH2
FB1
FB2
CC
High Efficiency 2-Phase 12V/150W Step-Down Converter
LTC3857
+
–
–
+
●
PGOOD2
PGOOD1
www.linear.com
BOOST1
BOOST2
INTV
PGND
SW1
SW2
BG1
TG1
TG2
BG2
V
CC
IN
100k
100k
C
L1: SUMIDA CDEP106-6ROM
L2: SUMIDA CDEP106-6ROM
MTOP1, MTOP2: INFINEON BSZ097NO4LS
MBOT1, MBOT2: INFINEON BSZ097NO4LS
OUT1
INTV
, C
D1
D2
OUT2
CC
C
0.47μF
C
0.47μF
: SANYO 16T0C22M
B1
B2
C
4.7μF
COMMENTS
Outputs (≥5V) Remain in Regulation Through Cold Crank, 2.5V ≤ V
V
Phase-Lockable Fixed Operating Frequency 50kHz to 900kHz,
4V ≤ V
Phase-Lockable Fixed Operating Frequency 50kHz to 900kHz,
4V ≤ V
Phase-Lockable Fixed Operating Frequency 50kHz to 900kHz,
4V ≤ V
Phase-Lockable Fixed Operating Frequency 140kHz to 650kHz,
4V ≤ V
Phase-Lockable Fixed Operating Frequency 140kHz to 650kHz,
4V ≤ V
Adjustable Fixed Operating Frequency 100kHz to 500kHz,
4V ≤ V
Selectable Fixed 200kHz to 600kHz Operating Frequency,
4V ≤ V
INT
OUT(BUCK)
IN
IN
IN
IN
IN
IN
IN
≤ 24V, 0.8V ≤ V
≤ 38V, 0.8V ≤ V
≤ 60V, 0.8V ≤ V
≤ 36V, 0.8V ≤ V
≤ 36V, 0.8V ≤ V
≤ 60V, 1.23V ≤ V
≤ 60V, 0.8V ≤ V
MBOT1
MTOP1
MTOP2
MBOT2
Up to 24V, V
C
10μF
50V
IN
6μH
6μH
L1
L2
OUT(BOOST)
OUT
OUT
OUT
OUT
OUT
OUT
OUT
R
R
≤ V
SENSE1
SENSE2
5mΩ
10μF
50V
5mΩ
≤ 14V, I
≤ 24V, I
≤ 24V, I
≤ 10V, I
≤ 10V, I
≤ 36V, I
IN
, I
V
19V TO 28V
Up to 60V, I
IN
Q
Q
Q
Q
Q
Q
3857 TA07
Q
= 40μA, MSOP-10E
© LINEAR TECHNOLOGY CORPORA TION 2009
= 170μA,
= 170μA,
= 50μA,
= 30μA,
= 80μA,
= 120μA, TSSOP-16
C
22μF
16V
C
22μF
16V
OUT1
OUT2
Q
= 55μA,
LT 1110 REV C • PRINTED IN USA
10μF
16V
10μF
16V
V
12V
12.5A
OUT
IN
≤ 38V,
3857fc