Datasheet

LTC3838-1
52
38381f
For more information www.linear.com/3838-1
 LINEAR TECHNOLOGY CORPORATION 2013
LT 0213 • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX: [phone]
●
www.linear.com/3838-1
RELATED PARTS
TYPICAL APPLICATION
7V to 14V Input, 5V/7A and 3.3V/7A Dual Output, 2MHz, R
SENSE
, Step-Down Converter with EXTV
CC
Tied to 5V Output
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
LTC3838/LTC3838-2 Dual or Single Output, Controlled On-Time, Synchronous Step-
Down Controller with Diff Amp(s), Internal/External Reference
200kHz to 2MHz Operating Frequency, 4.5V ≤ V
IN
≤ 38V,
0.6V/0.4V
≤ V
OUT
≤ 5.5V, 5mm × 7mm QFN-38, TSSOP-38
LTC3839 Single Output, 2-Channel Fast Controlled On-Time
Synchronous Step-Down Controller with Diff Amp
200kHz to 2MHz Operating Frequency, 4.5V ≤ V
IN
≤ 38V,
0.6V ≤ V
OUT
≤ 5.5V, 5mm × 5mm QFN-32
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
LTC3861/LTC3861-1 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
100k
45.3k
38381 TA02
1nF
0.1µF
L2
0.8µH
C
OUT2
47µF
×2
DB2
V
OUT1
MT2
MB2
LTC3838-1
2.2Ω
2.2Ω
73.2k
100k
24.9k
18.7k
V
IN
1µF
1nF
4.7µF
0.1µF
0.01µF
C
FF1
47pF
0.01µF
22pF 22pF
330pF 330pF
L1
0.8µH
R
S1
0.008Ω
R
S2
0.008Ω
C
OUT1
47µF
×2
V
OUT1
5V
7A
V
OUT2
3.3V
7A
V
IN
7V TO 14V
10k
10k//45.3k
10k
SENSE1
–
SENSE1
+
BOOST1
TG1
SW1
SENSE2
+
BOOST2
TG2
SW2
DRV
CC1
INTV
CC
DRV
CC2
EXTV
CC
DB1
SENSE2
–
BG1 BG2
V
DFB2
+
V
DFB2
–
PGND
V
OUTSENSE1
+
V
OUTSENSE1
–
PGOOD1 PGOOD2
TRACK/SS1
ITH1
DTR1
V
RNG
TRACK/SS2
ITH2
DTR2
PHASMD
MODE/PLLIN
CLKOUT
RUN2
SGND
RUN1
RT
PGOOD1 PGOOD2
MT1
MB1
1µF
C
IN2
10µF
×3
C
IN1
39µF
+
10Ω
10Ω
10Ω
10Ω
35.7k
C
IN1
: SANYO 16SVP39M
C
IN2
: MURATA GRM32DR61E106K
C
OUT1
, C
OUT2
: TAIYO YUDEN LMK325BJ476MM-T
DB1, DB2: CENTRAL CMDSH-3
L1, L2: COILCRAFT XAL5030-801MEB
MT1, MB1, MT2, MB2: VISHAY Si7114ADN
C
FF2
150pF
SGND