Datasheet

LTC3838
54
3838fa
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 0612 REV A • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
4.5V to 26V Input, 2.5V/4A and 1.8V/4A Dual Output, 1MHz, R
SENSE
, Dual Channel Power FETs, Step-Down Converter
PART NUMBER DESCRIPTION COMMENTS
LTC3833 Fast Controlled On-Time, High Frequency Synchronous
Step-Down Controller with Diff Amp
200kHz to 2MHz Operating Frequency, 4.5V ≤ V
IN
≤ 38V,
0.6V ≤ V
OUT
≤ 5.5V, , 3mm × 4mm QFN-20, TSSOP-20
LTC3880/LTC3880-1 Dual Output PolyPhase Step-Down DC/DC Controller with
Digital Power System Management
I
2
C/PMBus Interface with EEPROM and 16-Bit ADC, V
IN
Up to 24V,
0.5V ≤ V
OUT
≤ 5.5V, Analog Control Loop
LTC3869/LTC3869-2 Dual Output, 2-Phase Synchronous Step-Down DC/DC
Controller, with Accurate Current Sharing
PLL Fixed 250kHz to 750kHz Frequency, 4V ≤ V
IN
≤ 38V,
V
OUT3
Up to 12.5V
LTC3855 Dual Output, 2-phase, Synchronous Step-Down DC/DC
Controller with Diff Amp and DCR Temperature Compensation
PLL Fixed Frequency 250kHz to 770kHz, 4.5V ≤ V
IN
≤ 38V,
0.8V ≤ V
OUT
≤ 12V
LTC3856 Single Output 2-Channel Synchronous Step-Down DC/DC
Controller with Diff Amp and Up to 12-Phase Operation
PLL 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 Diff Amp and Three-State Output Drive
Operates with Power Blocks, DRMOS Devices or External Drivers/
MOSFETs, 3V ≤ V
IN
≤ 24V, t
ON(MIN)
= 20ns
LTC3850/LTC3850-1
LTC3850-2
Dual Output, 2-Phase Synchronous Step-Down DC/DC
Controller, R
SENSE
or DCR Current Sensing
PLL Fixed 250kHz to 780kHz Frequency, 4V ≤ V
IN
≤ 30V,
0.8V ≤ V
OUT
≤ 5.25V
LTC3829 Single Output 3-Channel Synchronous Step-Down DC/DC with
Diff Amp and Up to 6-phase Operation
Controller Phase-Lockable Fixed 250kHz to 770kHz Frequency,
4.5V ≤ V
IN
≤ 38V, 0.8V ≤ V
OUT
≤ 5V
LTC3853 Triple Output, Multiphase Synchronous Step-Down DC/DC
Controller, R
SENSE
or DCR Current Sensing and Tracking
PLL Fixed 250kHz to 750kHz Frequency, 4V ≤ V
IN
≤ 24V,
V
OUT3
Up to 13.5V
100k
20k
3838 TA02
1nF
0.1µF
L2
1.2µH
C
OUT2
100µF
w2
DB2
M2
LTC3838
2.2
2.2
31.6k
100k
39.2k
V
IN
1µF
1nF
4.7µF
0.1µF
0.01µF
75k 61.9k
100pF 100pF
0.01µF
L1
1.2µH
R
S1
0.006
R
S2
0.006
C
OUT1
100µF
w2
V
OUT1
2.5V
4A
V
OUT2
1.8V
4A
V
IN
4
.5V TO 26V
10k 10k
SENSE1
–
SENSE1
+
BOOST1
TG1
SW1
SENSE2
+
BOOST2
TG2
SW2
DRV
CC1
INTV
CC
DRV
CC2
EXTV
CC
DB1
SENSE2
–
BG1 BG2
V
FB2
PGND
V
OUTSENSE1
+
V
OUTSENSE1
–
PGOOD1 PGOOD2
TRACK/SS1
ITH1
DTR1
V
RNG1
TRACK/SS2
ITH2
DTR2
PHASMD
MODE/PLLIN
CLKOUT
RUN2
V
RNG2
SGND
RUN1
RT
PGOOD1
PGOOD2
M1
1µF
C
IN2
10µF
w3
C
IN1
47µF
+
20
20
20
20
C
IN1
: SUN CON 35HVP47M
C
IN2
: TAIYO YUDEN GMK325BJ106MN-T
C
OUT1
,C
OUT2
: MURATA GRM31CR60J107ME39
L
C
OUT2
, C
OUT4
: SANYO 4TPC150M
DB1, DB2: CENTRAL SEMI CMDSH-4ETR
L1, L2: COILCRAFT XAL5030-122MEB
M1, M2: SILICONIX SI4816DY