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参数资料
型号： LTC3851AEUD#TRPBF
厂商： LINEAR TECHNOLOGY CORP
元件分类： 稳压器
英文描述： SWITCHING REGULATOR, PQCC16
封装： 3 X 3 MM, LEAD FREE, PLASTIC, MO-220WEED-2, QFN-16
文件页数： 1/30页
文件大小： 430K
代理商： LTC3851AEUD#TRPBF
LTC3851A
1
3851afa
Typical applicaTion
FeaTures
applicaTions
DescripTion
Synchronous
Step-Down Switching
Regulator Controller
The LTC3851A is a high performance synchronous
step-down switching regulator controller that drives
an all N-channel synchronous power MOSFET stage. A
constant frequency current mode architecture allows a
phase-lockable frequency of up to 750kHz.
OPTI-LOOP compensation allows the transient response
to be optimized over a wide range of output capacitance
and ESR values. The LTC3851A features a precision 0.8V
reference that is compatible with a wide 4V to 38V input
supply range.
The TK/SS pin ramps the output voltage during start-up.
Current foldback limits MOSFET heat dissipation during
short-circuit conditions. The MODE/PLLIN pin selects
among Burst Mode operation, pulse-skipping mode or
continuous inductor current mode at light loads and al-
lows the IC to be synchronized to an external clock. The
LTC3851A contains an improved PLL compared to the
LTC3851.
The LTC3851A-1 is a version with a power good output
signal instead of adjustable current limit.
High Efficiency Synchronous Step-Down Converter
n
Wide VIN Range: 4V to 38V Operation
n
RSENSE or DCR Current Sensing
n
±1% Output Voltage Accuracy
n
Phase-Lockable Fixed Frequency: 250kHz to 750kHz
n
Dual N-Channel MOSFET Synchronous Drive
n
Very Low Dropout Operation: 99% Duty Cycle
n
Adjustable Output Voltage Soft-Start or Tracking
n
Output Current Foldback Limiting
n
Output Overvoltage Protection
n
5V Internal Regulator
n
OPTI-LOOP Compensation Minimizes COUT
n
Selectable Continuous, Pulse-Skipping or
Burst Mode Operation at Light Loads
n
Low Shutdown IQ: 20A
n
VOUT Range: 0.8V to 5.5V
n
Thermally Enhanced 16-Lead MSOP, 16-Lead Narrow
SSOP or 3mm
× 3mm QFN Package
n
Automotive Systems
n
Telecom Systems
n
Industrial Equipment
n
Distributed DC Power Systems
Efficiency and Power Loss
vs Load Current
L
, LT, LTC, LTM, Burst Mode, OPTI-LOOP, Linear Technology and the Linear logo are registered
trademarks and No RSENSE, UltraFast are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents including
5408150, 5481178, 5705919, 5929620, 6304066, 6498466, 6580258, 6611131.
ILIM
RUN
TK/SS
ITH
FREQ/PLLFLTR
VIN
TG
SW
INTVCC
MODE/PLLIN
BG
SENSE+
SENSE–
VFB
GND
0.1F
0.047F
3.01k
LTC3851A
22F
VIN
4.5V TO 36V
VOUT
3.3V
15A
3851A TA01a
0.68H
30.1k
330pF
2200pF
0.1F
330F
×2
BOOST
15k
154k
48.7k
82.5k
0.1F
4.7F
LOAD CURRENT (mA)
10
70
EFFICIENCY
(%)
POWER
LOSS
(mW)
75
80
85
90
100
1000
10000
100000
3851A TA01b
65
60
55
50
95
100
1000
100
10
10000
VIN = 12V
VOUT = 3.3V
EFFICIENCY
POWER LOSS
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相关代理商/技术参数
参数描述
LTC3851AHMSE#PBF 功能描述:IC REG CTRLR BUCK PWM CM 16-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)
LTC3851AHMSE#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 16-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)
LTC3851AHMSE-1#PBF 功能描述:IC REG CTRLR BUCK PWM CM 16-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)
LTC3851AHMSE-1#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 16-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)
LTC3851AIGN#PBF 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP 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)
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