参数资料
型号: LTC3731CG#TRPBF
厂商: Linear Technology
文件页数: 1/34页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 36-SSOP
标准包装: 2,000
系列: PolyPhase®
PWM 型: 电流模式
输出数: 1
频率 - 最大: 750kHz
占空比: 98.5%
电源电压: 4 V ~ 36 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: 0°C ~ 70°C
封装/外壳: 36-SSOP(0.209",5.30mm 宽)
包装: 带卷 (TR)

LTC3731
3-Phase, 600kHz,
Synchronous Buck Switching
Regulator Controller
3-Phase Current Mode Controller with Onboard
±5% Output Current Matching Optimizes Thermal
Differential Amplifier Accurately Senses V OUT
±1% V REF Accuracy Over Temperature
V OUT Range: 0.6V to 5.5V without Diffamp
V OUT Range: 0.6V to (V CC – 1.2V) with Diffamp
250kHz to 600kHz Per Phase, PLL, Fixed Frequency
PWM, Stage Shedding? or Burst Mode ? Operation
OPTI-LOOP ? Compensation Minimizes C OUT
Adjustable Soft-Start Current Ramping
Short-Circuit Shutdown Timer with Defeat Option
Overvoltage Soft Latch
Adjustable Undervoltage Lockout Threshold
Selectable Phase Output for Up to 12-Phase Operation
Available in 5mm × 5mm QFN and 36-Pin Narrow
Desktop Computers and Servers
High Performance Notebook Computers
High Output Current DC/DC Power Supplies
FEATURES
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MOSFET Drivers
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Performance and Size of Inductors and MOSFETs
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(0.209") SSOP Packages
APPLICATIONS
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DESCRIPTION
The LTC ? 3731 is a PolyPhase ? synchronous step-down
switching regulator controller that drives all N-channel
external power MOSFET stages in a phase-lockable fixed
frequency architecture. The 3-phase controller drives its
output stages with 120° phase separation at frequencies
of up to 600kHz per phase to minimize the RMS current
losses in both the input and output filter capacitors. The
3-phase technique effectively triples the fundamental fre-
quency, improving transient response while operating each
controller at an optimal frequency for efficiency and ease of
thermal design. Light load efficiency is optimized by using a
choice of output Stage Shedding or Burst Mode operation.
A differential amplifier provides true remote sensing of
both the high and low side of the output voltage at the
point of load.
Soft-start and a defeatable, timed short-circuit shutdown
protect the MOSFETs and the load. Current foldback
provides protection for the external MOSFETs under
short-circuit or overload conditions.
L , LT, LTC, LTM, Bust Mode, OPTI-LOOP, PolyPhase, Linear Technology and the Linear logo
are registered and Stage Shedding is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents, including
5481178, 5929620, 6177787, 6144194, 6100678, 5408150, 6580258, 6462525, 630466,
5705919.
SW1
BG1
SENSE1 +
PGOOD
TYPICALAPPLICATION
V CC
4.5V TO 7V
10μF
0.1μF
SW3 SW2 SW1
POWER GOOD INDICATOR
OPTIONAL SYNC IN
V CC TG1
LTC3731
BOOST1
BOOST2
BOOST3
SENSE1 –
TG2
PLLIN SW2
PLLFLTR BG2
V IN
0.8μH
0.8μH
0.003
0.003
+
22μF
35V
V OUT
1.35V
55A
V IN
5V TO 28V
V IN
36k
12k
5k
7.5k
6.04k
680pF
0.01μF
100pF
UVADJ
I TH
RUN/SS
SGND
EAIN
DIFFOUT
IN –
IN +
PGND
SENSE2 +
SENSE2 –
TG3
SW3
BG3
SENSE3 +
SENSE3 –
V IN
0.8μH
0.003
+
C OUT
470μF
4V
3731 F01
Figure 1. High Current Triple Phase Step-Down Converter
3731fc
1
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相关代理商/技术参数
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LTC3731CUH 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX
LTC3731CUH#PBF 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX
LTC3731CUH#PBF 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BUCK, 600KHZ, 240A, QFN
LTC3731CUH#TR 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX
LTC3731CUH#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX