参数资料
型号: LTC3861IUHE#PBF
厂商: Linear Technology
文件页数: 1/38页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM VM 36-QFN
标准包装: 61
系列: PolyPhase®
PWM 型: 电压模式
输出数: 2
频率 - 最大: 2.1MHz
占空比: 91.5%
电源电压: 3 V ~ 5.5 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 36-WFQFN 裸露焊盘
包装: 管件
LTC3861
FEATURES
Dual, Multiphase Step-Down
Voltage Mode DC/DC Controller
with Accurate Current Sharing
DESCRIPTION
Operates with Power Blocks, DrMOS or External
Constant-Frequency Voltage Mode Control with
±0.75% 0.6V Voltage Reference
Dual Differential Output Voltage Sense Amplifiers
Multiphase Capability—Up to 12-Phase Operation
Programmable Current Limit
Safely Powers a Prebiased Load
Programmable or PLL-Synchronizable Switching
Lossless Current Sensing Using Inductor DCR or
V CC Range: 3V to 5.5V
V IN Range: 3V to 24V
Power Good Output Voltage Monitor
Output Voltage Tracking Capability
Programmable Soft-Start
Available in a 36-Pin 5mm × 6mm QFN Package
High Current Distributed Power Systems
DSP, FPGA and ASIC Supplies
Datacom and Telecom Systems
Industrial Power Supplies
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Gate Drivers and MOSFETs
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Accurate Current Sharing
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Frequency Up to 2.25MHz
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Precision Current Sensing with Sense Resistor
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APPLICATIONS
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L , LT, LTC, LTM, PolyPhase, Linear Technology and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners. Protected by U.S. Patents, including 6144194, 5055767
The LTC ? 3861 is a dual PolyPhase ? synchronous step-
down switching regulator controller for high current
distributed power systems, digital signal processors, and
other telecom and industrial DC/DC power supplies. It uses
a constant-frequency voltage mode architecture combined
with very low offset, high bandwidth error amplifiers and a
remote output sense differential amplifier per channel for
excellent transient response and output regulation.
The controller incorporates lossless inductor DCR current
sensing to maintain current balance between phases and to
provide overcurrent protection. The chip operates from a
V CC supply between 3V and 5.5V and is designed for step-
down conversion from V IN between 3V and 24V to output
voltages between 0.6V and V CC – 0.5V.
The TRACK/SS pins provide programmable soft-start or
tracking functions. Inductor current reversal is disabled
during soft-start to safely power prebiased loads. The
constant operating frequency can be synchronized to an
external clock or linearly programmed from 250kHz to
2.25MHz. Up to six LTC3861 controllers can operate in
parallel for 1-, 2-, 3-, 4-, 6- or 12-phase operation.
The LTC3861 is available in a 36-pin 5mm × 6mm QFN pack-
age. LTC3861-1 is a 32-pin QFN version of the LTC3861,
which has a single differential remote output voltage sense
amplifier.
LTC3861
I LIM2
V OUT VSNSP1
10k
VSNSN2
10k
PWM2
I AVG
TYPICALAPPLICATION
V IN
V CC V CC VINSNS PWM1
1μF FREQ
28k FB2
RUN1,2
I LIM1
VSNSOUT1 ISNS1P
ISNS1N
VSNSN1 ISNS2N
VSNSOUT2 ISNS2P
VSNSP2
3.3nF
CONFIG
10k 280
FB1
COMP1,2 SS1,2 SGND CLKIN
4.7nF
5.9k 100pF 0.1μF
V CC
59k
V CC
100pF
0.22μF
0.22μF
LTC4449
IN GND
V LOGIC TG
V CC TS
BOOST BG
0.22μF
LTC4449
IN GND
V LOGIC TG
V CC TS
BOOST BG
0.22μF
V IN , 7V TO 14V
TG1
SW1
BG1
V IN
TG2
SW2
BG2
180μF
0.47μH
2.87k
2.87k
0.47μH
3861 TA01
330μF
× 6
100μF
× 4
V OUT
1.2V
60A
1
For more information www.linear.com/LTC3861
3861fa
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