参数资料
型号: LTC3855IFE#TRPBF
厂商: Linear Technology
文件页数: 1/44页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 38TSSOP
标准包装: 2,000
系列: PolyPhase®
PWM 型: 电流模式
输出数: 2
频率 - 最大: 850kHz
占空比: 95%
电源电压: 4.5 V ~ 38 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: 38-TFSOP (0.173",4.40mm 宽)裸露焊盘
包装: 带卷 (TR)
LTC3855
Dual, Multiphase
Synchronous DC/DC Controller
with Differential Remote Sense
Dual, 180 ° Phased Controllers Reduce Required
High Efficiency: Up to 95%
R SENSE or DCR Current Sensing
Programmable DCR Temperature Compensation
±0.75% 0.6V Output Voltage Accuracy
Phase-Lockable Fixed Frequency 250kHz to 770kHz
True Remote Sensing Differential Amplifier
Dual N-Channel MOSFET Synchronous Drive
Wide V IN Range: 4.5V to 38V
V OUT Range: 0.6V to 12.5V without Differential Amplifier
V OUT Range: 0.6V to 3.3V with Differential Amplifier
Clock Input and Output for Up to 12-Phase Operation
Adjustable Soft-Start or V OUT Tracking
Foldback Output Current Limiting
Output Overvoltage Protection
40-Pin (6mm × 6mm) QFN and 38-Lead FE Packages
Computer Systems
Telecom Systems
Industrial and Medical Instruments
DC Power Distribution Systems
FEATURES
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Input Capacitance and Power Supply Induced Noise
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APPLICATIONS
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DESCRIPTION
The LTC ? 3855 is a dual PolyPhase ? current mode synchro-
nous step-down switching regulator controller that drives
all N-channel power MOSFET stages. It includes a high
speed differential remote sense amplifier. The maximum
current sense voltage is programmable for either 30mV,
50mV or 75mV, allowing the use of either the inductor DCR
or a discrete sense resistor as the sensing element.
The LTC3855 features a precision 0.6V reference and can
produce output voltages up to 12.5V. A wide 4.5V to 38V
input supply range encompasses most intermediate bus
voltages and battery chemistries. Power loss and supply
noise are minimized by operating the two controller output
stages out of phase. Burst Mode ? operation, continuous
or pulse-skipping modes are supported.
The LTC3855 can be configured for up to 12-phase op-
eration, has DCR temperature compensation, two power
good signals and two current limit set pins. The LTC3855
is available in low profile 40-pin 6mm × 6mm QFN and
38-lead exposed pad FE packages.
L , LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode and PolyPhase are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners. Protected by U.S. Patents including 5481178, 5705919, 5929620, 6100678,
6144194, 6177787, 6304066, 6580258.
TYPICAL APPLICATION
High Efficiency Dual 1.8V/1.2V Step-Down Converter
0.56μH
4.7μF
+
0.1μF
TG1
BOOST1
SW1
V IN
INTV CC
TG2
BOOST2
SW2
1μF
0.1μF
22μF
0.4μH
V IN
4.5V TO
20V
I LOAD
5A/DIV
300mA TO 5A
Load Step
(Forced Continuous Mode)
0.1μF
LTC3855
V OUT1
1.8V
15A
+
40.2k
330μF
×2
20k
470pF
15k
BG1 BG2
PGND1 PGND2
FREQ
SENSE1 + SENSE2 +
SENSE1 – SENSE2 –
DIFFOUT
V FB1 V FB2
I TH1 I TH2
TK/SS1 DIFFP SGND DIFFN TK/SS2
0.1μF
100k
20k
470pF
7.5k
20k
+
V OUT2
1.2V
15A
330μF
×2
I L
5A/DIV
V OUT
100mV/DIV
AC-COUPLED
V IN = 12V
V OUT = 1.8V
50μs/DIV
3855 TA01a
3855 TA01
3855f
 
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相关代理商/技术参数
参数描述
LTC3855IUJ#PBF 功能描述:IC REG CTRLR BUCK PWM CM 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 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:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR
LTC3855IUJ#PBF-ES 制造商:Linear Technology 功能描述:
LTC3855IUJ#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 40-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:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR)
LTC3856EFE#PBF 功能描述:IC REG CTRLR BUCK PWM CM 38TFSOP 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:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 V 降压:无 升压:是 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:8-TSSOP(0.173",4.40mm 宽) 包装:带卷 (TR)
LTC3856EFE#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 38TSSOP 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:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR)