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参数资料
型号： LTC3851EUD-1#TRPBF
厂商： LINEAR TECHNOLOGY CORP
元件分类： 稳压器
英文描述： SWITCHING CONTROLLER, PQCC16
封装： 3 X 3 MM, LEAD FREE, PLASTIC, MO-220WEED-6, QFN-16
文件页数： 1/28页
文件大小： 337K
代理商： LTC3851EUD-1#TRPBF
LTC3851-1
1
38511f
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Synchronous
Step-Down Switching
Regulator Controller
The LTC
3851-1 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 LTC3851-1 features a precision 0.8V
reference and a power good indicator. A wide 4V to 38V (40V
absolute maximum) input supply range encompasses most
battery congurations and intermediate bus voltages.
The TK/SS pin ramps the output voltage during start-up
and shutdown with coincident or ratiometric tracking.
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 allows
the IC to be synchronized to an external clock.
The LTC3851-1 is identical to the LTC3851 except that the
ILIM pin is replaced by PGOOD.
High Efciency Synchronous Step-Down Converter
n Wide VIN Range: 4V to 38V Operation
n RSENSE or DCR Current Sensing
n ±1% Output Voltage Accuracy
n Power Good Output Voltage Monitor
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 OPTI-LOOP
Compensation Minimizes COUT
n Selectable Continuous, Pulse-Skipping or
Burst Mode
Operation at Light Loads
n Low Shutdown IQ: 20μA
n VOUT Range: 0.8V to 5.5V
n Thermally Enhanced 16-Lead MSOP
or 3mm
× 3mm QFN Package
n Automotive Systems
n Telecom Systems
n Industrial Equipment
n Distributed DC Power Systems
Efciency and Power Loss
vs Load Current
L, LT, LTC, LTM, Burst Mode 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 5408150, 5481178, 5705919, 5929620, 6304066,
6498466, 6580258, 6611131.
PGO0D
RUN
TK/SS
ITH
FREQ/PLLFLTR
VIN
INTVCC
TG
SW
INTVCC
PLLIN/MODE
BG
SENSE+
SENSE–
VFB
GND
0.047μF
0.1μF
4.7μF
3.01k
LTC3851-1
22μF
VIN
4.5V TO 38V
VOUT
3.3V
15A
38511 TA01a
0.68μH
330pF
2200pF
0.1μF
330μF
2
BOOST
15k
154k
48.7k
30.1k
82.5k
100k
LOAD CURRENT (mA)
10
70
EFFICIENCY
(%)
POWER
LOSS
(mW)
75
80
85
90
100
1000
10000
100000
38511TA01b
65
60
55
50
95
100
1000
100
10
10000
VIN = 12V
VOUT = 3.3V
EFFICIENCY
POWER LOSS
相关PDF资料
PDF描述
LTCEMSE-1#PBF SWITCHING CONTROLLER, PDSO16
LTC3851IUD-1#TRPBF SWITCHING CONTROLLER, PQCC16
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LTC3859EFE#PBF SWITCHING CONTROLLER, 900 kHz SWITCHING FREQ-MAX, PDSO38
LTC3859EFE#TRPBF SWITCHING CONTROLLER, 900 kHz SWITCHING FREQ-MAX, PDSO38
相关代理商/技术参数
参数描述
LTC3851IGN#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:2,000 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)
LTC3851IGN#TRPBF 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)
LTC3851IMSE#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)
LTC3851IMSE#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)
LTC3851IMSE-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)
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