參數(shù)資料
型號(hào)： LTC3851AEUD-1#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 0.05 A SWITCHING CONTROLLER, 810 kHz SWITCHING FREQ-MAX, PQCC16
封裝： 3 X 3 MM, LEAD FREE, PLASTIC, MO-220WEED-2, QFN-16
文件頁數(shù)： 1/30頁
文件大?。?/td> 0K
代理商： LTC3851AEUD-1#TRPBF
LTC3851A-1
1
3851a1fa
Typical applicaTion
FeaTures
applicaTions
DescripTion
Synchronous
Step-Down Switching
Regulator Controller
The LTC3851A-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
andESRvalues.TheLTC3851A-1featuresaprecision0.8V
reference and a power good indicator. A wide 4V to 38V
(40Vabsolutemaximum)inputsupplyrangeencompasses
mostbatteryconfigurationsandintermediatebusvoltages.
TheTK/SSpinrampstheoutputvoltageduringstart-upand
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 continu-
ous inductor current mode at light loads and allows the IC
to be synchronized to an external clock. The LTC3851A-1
contains an improved PLL compared to the LTC3851-1.
The LTC3851A-1 is identical to the LTC3851A except that
the ILIM pin is replaced by PGOOD.
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
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: 20A
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
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.
PGO0D
RUN
TK/SS
ITH
FREQ/PLLFLTR
VIN
INTVCC
TG
SW
INTVCC
MODE/PLLIN
BG
SENSE+
SENSE–
VFB
GND
0.047F
0.1F
4.7F
3.01k
LTC3851A-1
22F
VIN
4.5V TO 38V
VOUT
3.3V
15A
3851A1 TA01a
0.68H
330pF
2200pF
0.1F
330F
×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
3851A1 TA01b
65
60
55
50
95
100
1000
100
10
10000
VIN = 12V
VOUT = 3.3V
EFFICIENCY
POWER LOSS
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3851AHMSE#PBF 功能描述:IC REG CTRLR BUCK PWM CM 16-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LTC3851AHMSE#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 16-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LTC3851AHMSE-1#PBF 功能描述:IC REG CTRLR BUCK PWM CM 16-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LTC3851AHMSE-1#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 16-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LTC3851AIGN#PBF 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
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