Datasheet
LTC3861-1
38
38611fa
For more information www.linear.com/LTC3861-1
relaTeD parTs
PART NUMBER DESCRIPTION COMMENTS
LTC3880/
LTC3880-1
Dual Output PolyPhase Step-Down DC/DC Controller with
Digital Power System Management
V
IN
Up to 24V, 0.5V ≤ V
OUT
≤ 5.5V, Analog Control Loop,
I
2
C/PMBus Interface with EEPROM and 16-Bit ADC
LTC3855 Dual Output, 2-Phase, Synchronous Step-Down DC/DC Controller
with Diffamp and DCR Temperature Compensation
4.5V ≤ V
IN
≤ 38V, 0.8V ≤ V
OUT
≤ 12V, PLL Fixed Frequency
250kHz to 770kHz
LTC3856 Single Output 2-Phase Synchronous Step-Down DC/DC Controller
with Diffamp and DCR Temperature Compensation
4.5V ≤ V
IN
≤ 38V, 0.8V ≤ V
OUT
≤ 5V, PLL Fixed 250kHz to
770kHz Frequency
LTC3838 Dual Output, 2-Phase, Synchronous Step-Down DC/DC Controller
with Diff Amp and Controlled On-Time
4.5V ≤ V
IN
≤ 38V, 0.8V ≤ V
OUT
≤ 5.5V, PLL, Up to 2MHz
Switching Frequency
LTC3839 Single Output, 2-Phase, Synchronous Step-Down DC/DC Controller
with Diff Amp and Controlled On-Time
4.5V ≤ V
IN
≤ 38V, 0.8V ≤ V
OUT
≤ 5.5V, PLL, Up to 2MHz
Switching Frequency
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
LTC3869/
LTC3869-2
Dual Output, 2-Phase Synchronous Step-Down DC/DC
Controller,
with Accurate Current Share
4V ≤ V
IN
≤ 38V, V
OUT3
Up to 12.5V, PLL Fixed 250kHz to
750kHz Frequency
LTC3866 Single Output, High Power, Current Mode Controller with
Submilliohm DCR Sensing
4.75V ≤ V
IN
≤ 38V, 0.6V≤ V
OUT
≤ 3.5V, Fixed 250kHz to
770kHz Frequency
LTC4449 High Speed Synchronous N-Channel MOSFET Driver V
IN
Up to 38V, 4V ≤ V
CC
≤ 6.5V, Adaptive Shoot-Through
Protection, 2mm × 3mm DFN-8 Package
LTC4442/
LTC4442-1
High Speed Synchronous N-Channel MOSFET Driver V
IN
Up to 38V, 6V ≤ V
CC
≤ 9V Adaptive Shoot-Through
Protection, MSOP-8 Package
LTC3861 Dual, Multiphase, Synchronous Step-Down DC/DC Controller
with Tw o Diffamps and Three-State Output Drive
Operates with Power Blocks, DrMOS Devices or External
MOSFETs, 3V ≤ V
IN
≤ 24V, t
ON(MIN)
= 20ns
Typical applicaTion
Dual Phase 1.2V/60A Converter with Discrete Gate Drivers and MOSFETs, f
SW
= 300kHz
V
OUT
1.2V/60A
C
OUT1
100µF × 4
6.3V
C
OUT2
: SANYO 2R5TPE330M9
C
OUT1
: MURATA GRM32ER60J107ME20
L1, L2 : WÜRTH ELEKTRONIK 744355147
C
IN2
22µF × 2
C
OUT2
330µF × 6
2.5V
C
IN3
22µF × 2
28.7k
V
CC
V
CC
59k
13k
1nF
LTC3861-1
FB1
COMP1
VSNSP
VSNSN
VSNSOUT
COMP2
FB2
RUN1
I
LIM1
SGND
ISNS1P
ISNS1N
ISNS2N
ISNS2P
SGND
I
LIM2
RUN2
V
CC
SS1
VINSNS
CONFIG
I
AVG
PGOOD1
PWMEN1
PWM1
SS2
FREQ
CLKIN
CLKOUT
PHSMD
PGOOD2
PWMEN2
PWM2
RUN1
RUN1
V
CC
V
OUT
V
CC
5V
100k
221Ω
1nF
220pF
20k
20k
1µF
V
IN
7V TO 14V
LTC4449
IN
V
CC
L1
0.47µH
L2
0.47µH
D1
0.22µF
0.22µF
2.87k
M2
2.87k
SS1
SS1
V
IN
4.7µF
V
LOGIC
V
CC
BOOST
GND
TG
TS
BG
C
IN1
180µF
38611 TA06
0.22µF
BSC010NE2LS
× 2
M1
BSC050NE2LS
× 2
LTC4449
IN
V
CC
D2
M4
V
IN
4.7µF
V
LOGIC
V
CC
BOOST
GND
TG
TS
BG
0.22µF
BSC010NE2LS
× 2
M3
BSC050NE2LS
× 2
100pF
LINEAR TECHNOLOGY CORPORATION 2012
LT 0613 REV A PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com/LTC3861-1