参数资料
型号: LTC3854EMSE#PBF
厂商: Linear Technology
文件页数: 1/28页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 12-MSOP
标准包装: 37
PWM 型: 电流模式
输出数: 1
频率 - 最大: 440kHz
占空比: 98%
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 ~ 85°C
封装/外壳: 12-TSSOP (0.118",3.00mm 宽)裸露焊盘
包装: 管件
产品目录页面: 1336 (CN2011-ZH PDF)
LTC3854
Wide Operating V IN Range: 4.5V to 38V
R SENSE or DCR Current Sensing
±1% 0.8V Reference Accuracy Over Temperature
400kHz Switching Frequency
Dual N-channel MOSFET Synchronous Drive
Very Low Dropout Operation: 97% Duty Cycle
Starts Up Into Pre-Biased Output
Adjustable Output Voltage Soft-Start
Output Current Foldback Limiting
Output Overvoltage Protection
5V LDO for External Gate Drive
OPTI-LOOP ? Compensation Minimizes C OUT
Low Shutdown I Q : 15μA
Tiny Thermally Enhanced 12-Pin 2mm × 3mm DFN
Automotive Systems
Telecom Systems
Industrial Equipment
Distributed DC Power Systems
FEATURES
n
n
n
n
n
n
n
n
n
(Disabled During Soft-Start)
n
n
n
n
n
and MSOP Packages
APPLICATIONS
n
n
n
n
TYPICAL APPLICATION
Small Footprint, Wide
V IN Range Synchronous
Step-Down DC/DC Controller
DESCRIPTION
The LTC3854 ? is a high performance synchronous step-
down switching DC/DC controller that drives an all N-
channel synchronous power MOSFET stage.
The LTC3854 features a 400kHz constant frequency current
mode architecture. The LTC3854 operates from a 4.5V to
38V (40V absolute maximum) input voltage range and
regulates the output voltage from 0.8V to 5.5V.
The RUN/SS pin provides both soft-start and enable
features. OPTI-LOOP compensation allows the transient
response to be optimized over a wide range of output ca-
pacitance and ESR values. Current foldback limits MOSFET
dissipation during short circuit conditions. Current foldback
functions are disabled during soft-start.
The LTC3854 has a minimum on-time at 75ns, making it
well suited for high step-down ratios. The strong onboard
MOSFET drivers allow the use of high power external
MOSFETs to produce output currents up to 20A.
L , LT, LTC, LTM, Linear Technology, the Linear logo and OPTI-LOOP are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners. Protected by U.S. Patents, including 5705919, 6498466, 5408150, 6222231.
High Efficiency Synchronous Step-Down Converter
Efficiency and Power Loss
vs Load Current
0.1μF
LTC3854
V IN
TG
0.1μF
47μF
50V
V IN
6V TO 38V
97
96
EFFICIENCY
2.0
1.6
2200pF
10k
8.06k
100pF
RUN/SS
ITH
BOOST
SW
INTV CC
4.7μF
4.7μH
AT 8.2m? DCR
0.22μF
5.49k
+
V OUT
5V
7A
150μF
95
94
93
POWER LOSS
1.2
0.8
0.4
42.2k
FB
SENSE –
SENSE +
BG
GND
4.99k
92
1
2
3 4 5
LOAD CURRENT (A)
V IN = 12V
6
7
0
3854 TA01b
3854 TA01
3854fb
1
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相关代理商/技术参数
参数描述
LTC3854IDDB#PBF 制造商:Linear Technology 功能描述:DP-SWREG/Controller, Cut Tape Small Footprint, Low Pin Count Synchronous Step-Do
LTC3854IDDB#TRMPBF 功能描述:IC REG CTRLR BUCK PWM CM 12-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 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)
LTC3854IDDB#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 12-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 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)
LTC3854IMSE#PBF 功能描述:IC REG CTRLR BUCK PWM CM 12-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 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)
LTC3854IMSE#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 12-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 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)