LTC3861-1 Datasheet, PDF (36/36 Pages) Linear Technology – Dual, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing

LTC3861-1
TYPICAL APPLICATION
Dual Phase 1.2V/60A Converter with Discrete Gate Drivers and MOSFETs, f_SW = 300kHz
V_IN
7V TO 14V
V_CC
5V
C_IN1
180µF
1nF _221Ω
13k
1nF
20k
220pF
20k
V_OUT
V_CC
C_OUT2 : SANYO 2R5TPE330M9
C_OUT1 : MURATA GRM32ER60J107ME20
L1, L2 : WÜRTH ELEKTRONIK 744355147
1µF ^SS1
100pF
V_CC
V_CC
4.7µF
100k
RUN1
V_IN
IN
LTC4449
GND
D1
V_LOGIC TG
V_CC
TS
BOOST BG
0.22µF
FB1
RUN1
59k
COMP1
VSNSP
ILIM1
SGND
VSNSN
ISNS1P
LTC3861-1 ISNS1N
VSNSOUT
ISNS2N
COMP2
ISNS2P
FB2
SGND
ILIM2 V_CC
RUN2
SS1 _28.7k
RUN1
V_CC
4.7µF
D2
V_IN
IN
LTC4449
GND
V_LOGIC TG
V_CC
TS
BOOST BG
0.22µF
C_IN2
22µF × 2
M1
BSC050NE2LS
×2
M2
BSC010NE2LS
×2
0.22µF
0.22µF
C_IN3
22µF × 2
M3
BSC050NE2LS
×2
M4
BSC010NE2LS
×2
L1
0.47µH
2.87k
2.87k
L2
0.47µH
38611 TA06
V_OUT
1.2V/ 60A
C_OUT1
C_OUT2
100µF × 4 330µF × 6
6.3V
2.5V
Related Parts
PART NUMBER
LTC3880/
LTC3880-1
LTC3855
LTC3856
LTC3838
LTC3839
LTC3860
LTC3869/
LTC3869-2
LTC3866
LTC4449
DESCRIPTION
Dual Output PolyPhase Step-Down DC/DC Controller with
Digital Power System Management
Dual Output, 2-Phase, Synchronous Step-Down DC/DC Controller
with Diffamp and DCR Temperature Compensation
Single Output 2-Phase Synchronous Step-Down DC/DC Controller
with Diffamp and DCR Temperature Compensation
Dual Output, 2-Phase, Synchronous Step-Down DC/DC Controller
with Diff Amp and Controlled On-Time
Single Output, 2-Phase, Synchronous Step-Down DC/DC Controller
with Diff Amp and Controlled On-Time
Dual, Multiphase, Synchronous Step-Down DC/DC Controller
with Diffamp and Three-State Output Drive
Dual Output, 2-Phase Synchronous Step-Down DC/DC Controller,
with Accurate Current Share
Single Output, High Power, Current Mode Controller with
Submilliohm DCR Sensing
High Speed Synchronous N-Channel MOSFET Driver
LTC4442/
LTC4442-1
LTC3861
High Speed Synchronous N-Channel MOSFET Driver
Dual, Multiphase, Synchronous Step-Down DC/DC Controller
with Two Diffamps and Three-State Output Drive
COMMENTS
IV^2IC^N/PUMp Btous24InVt,e0rf.5acVe≤wVit^Oh^UE^TE≤P5R.O5VM,
Analog Control
and 16-Bit ADC
Loop,
4.5V ≤ V_IN ≤ 38V, 0.8V ≤ V_OUT ≤ 12V, PLL Fixed Frequency
250kHz to 770kHz
4.5V ≤ V_IN ≤ 38V, 0.8V ≤ V_OUT ≤ 5V, PLL Fixed 250kHz to
770kHz Frequency
4.5V ≤ V_IN ≤ 38V, 0.8V ≤ V_OUT ≤ 5.5V, PLL, Up to 2MHz
Switching Frequency
4.5V ≤ V_IN ≤ 38V, 0.8V ≤ V_OUT ≤ 5.5V, PLL, Up to 2MHz
Switching Frequency
Operates with Power Blocks, DrMOS Devices or External
MOSFETs, 3V ≤ V_IN ≤ 24V, t_ON(MIN) = 20ns
4V ≤ V_IN ≤ 38V, V_OUT3 Up to 12.5V, PLL Fixed 250kHz to
750kHz Frequency
4.75V ≤ V_IN ≤ 38V, 0.6V≤ V_OUT ≤ 3.5V, Fixed 250kHz to
770kHz Frequency
V_IN Up to 38V, 4V ≤ V_CC ≤ 6.5V, Adaptive Shoot-Through
Protection, 2mm × 3mm DFN-8 Package
V_IN Up to 38V, 6V ≤ V_CC ≤ 9V Adaptive Shoot-Through
Protection, MSOP-8 Package
Operates with Power Blocks, DrMOS Devices or External
MOSFETs, 3V ≤ V_IN ≤ 24V, t_ON(MIN) = 20ns
36 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ^● FAX: [phone] ^● www.linear.com
38611f
LT 0812 PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2012