Datasheet

LTC3856
40
3856f
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
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www.linear.com
LINEAR TECHNOLOGY CORPORATION 2010
LT 0510 • PRINTED IN USA
relaTeD parTs
Typical applicaTion
PART NUMBER DESCRIPTION COMMENTS
LTC3829 3-Phase, Single Output, Synchronous Step-Down Controller
with Diffamp and DCR Temperature Compensation
Phase-Lockable Fixed 250kHz to 770kHz Frequency,
4.5V ≤ V
IN
≤ 38V, 0.8V ≤ V
OUT
≤ 5V
LTC3860 Dual, Multiphase, Synchronous Step-Down DC/DC Controller
with Diffamp and Three-State Output Drive
Operates with Power Blocks, DRMOS Devices or External
MOSFETs, 3V ≤ V
IN
≤ 24V, t
ON(MIN)
= 20ns
LTC3855 Dual, Multiphase, Synchronous Step-Down DC/DC Controller
with Diffamp and DCR Temperature Compensation
Phase-Lockable Fixed Frequency 250kHz to 770kHz,
4.5V ≤ V
IN
≤ 38V, 0.8V ≤ V
OUT
≤ 12V
LTC3853 Triple Output, Multiphase, Synchronous Step-Down DC/DC
Controller, R
SENSE
or DCR Current Sensing and Tracking
Phase-Lockable Fixed 250kHz to 750kHz Frequency,
4V ≤ V
IN
≤ 24V, V
OUT3
Up to 13.5V
LTC3850/LTC3850-1/
LTC3850-2
Dual 2-Phase, High Efficiency, Synchronous Step-Down
DC/DC Controller, R
SENSE
or DCR Current Sensing and Tracking
Phase-Lockable Fixed 250kHz to 780kHz Frequency,
4V ≤ V
IN
≤ 30V, 0.8V ≤ V
OUT
≤ 5.25V
3856 F19
TG1
BOOST1
SW1
BG1
SENSE1
+
SENSE1
–
TG2
BOOST2
SW2
BG2
INTV
CC
INTV
CC
SENSE2
+
SENSE2
–
DIFFOUT
V
FB
ILIM
RUN
PGOOD
0.1µF
L1
0.22µH
22µF
Q2
RJK0330DPB
Q6
RJK0330DPB
Q1
RJK0305DPB
Q5
RJK0305DPB
0.001Ω
CMDSH-3
PHASMD
MODE
ITEMP
FREQ
EXTV
CC
V
IN
V
IN
DIFFN
DIFFP
ISET
AVP
TK/SS
PLLIN
CLKOUT
I
TH
LTC3856
S
4.7µF
INTV
CC
0.1µF
INTV
CC
1nF
200Ω 200Ω
200Ω
100k
200Ω
22µF
V
IN
22µF
Q4
RJK0330DPB
Q8
RJK0330DPB
Q3
RJK0305DPB
Q7
RJK0305DPB
0.001Ω
CMDSH-3
22µF
V
IN
1nF
100pF
100µF
6.3V
s2
330µF
2.5V
s4
V
OUT
1.5V/
50A
4.7µF
6.3V
+
10Ω
10Ω
V
IN
4.5V
TO 14V
V
O_SNS
–
V
O_SNS
+
V
IN
GND
180µF
16V
s2
+
INTV
CC
PGOOD
100Ω
S
S
S
2.68k
330pF
S
47pF
30.1k
S
S
S
S
20k
49.9Ω
0.1µF
2.2Ω
100k
S
0.1µF
L2
0.22µH
PGND SGND
Figure 19. 1.5V/50A Converter with AVP