參數(shù)資料
型號(hào)： LT3845AEFE#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
封裝： 4.40 MM, LEAD FREE, PLASTIC, TSSOP-16
文件頁(yè)數(shù)： 1/26頁(yè)
文件大小： 284K
代理商： LT3845AEFE#PBF
LT3845A
1
3845afa
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
High Voltage Synchronous
Current Mode Step-Down
Controller with Adjustable
Operating Frequency
The LT3845A is a high voltage, synchronous, current
mode controller used for medium to high power, high
efficiency supplies. It offers a wide 4V to 60V input range
(7.5V minimum start-up voltage). An onboard regulator
simplifies the biasing requirements by providing IC power
directly from VIN.
Burst Mode operation maintains high efficiency at light
loadsbyreducingICquiescentcurrentto120A.Lightload
efficiencyisalsoimprovedwiththereverseinductorcurrent
inhibit function which supports discontinuous operation.
Additional features include adjustable fixed operating
frequency that can be synchronized to an external clock
for noise sensitive applications, gate drivers capable of
drivinglargeN-channelMOSFETs,aprecisionundervoltage
lockout, 10A shutdown current, short-circuit protection
and a programmable soft-start.
The LT3845A is available in a 16-lead thermally enhanced
TSSOP package.
n
High Voltage Operation: Up to 60V
n
Synchronizable Up to 600kHz
n
Adjustable Constant Frequency: 100kHz to 500kHz
n
Output Voltages Up to 36V
n
Stable Operation in Current Limit
n
Adaptive Nonoverlap Circuitry Prevents Switch
Shoot-Through
n
Reverse Inductor Current Inhibit for Discontinuous
Operation Improves Efficiency with Light Loads
n
Programmable Soft-Start
n
120A No Load Quiescent Current
n
10A Shutdown Supply Current
n
1% Regulation Accuracy
n
Standard Gate N-Channel Power MOSFETs
n
Reverse Overcurrent Protection
n
16-Lead Thermally Enhanced TSSOP Package
n
12V and 42V Automotive and Heavy Equipment
n
48V Telecom Power Supplies
n
Avionics and Industrial Control Systems
n
Distributed Power Converters
High Voltage Step-Down Regulator 48V to 12V at 75W
L
, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners..
Protected by U.S. Patents, including 5481178, 6611131, 6304066, 6498466, 6580258.
SGND
BAS521
1N4148
3845A TA01a
0.1F
1500pF
Si7370DP
B160
15H
0.008
LT3845A
1F
33F
×3
VOUT
12V
75W
1M
82.5k
16.2k
VIN
20V
TO 55V
2.2F
100V
49.9k
20k
100pF
2200pF
143k
47F
63V
BOOST
TG
SW
VCC
BG
PGND
SENSE+
SENSE–
VIN
SHDN
CSS
BURST_EN
VFB
VC
SYNC
fSET
Efficiency and Power Loss
vs Load Current
LOAD CURENT (A)
65
80
75
70
100
95
90
85
0
3
2
1
7
6
5
4
3845A TA01b
EFFICIENCY(%)
POWER
LOSS
(W)
0.1
10
1
VIN = 48V
LOSS
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT3845AIFE#PBF 功能描述:IC REG CTRLR BUCK PWM CM 16TSSOP 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:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LT3845AIFE#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 16TSSOP 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:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LT3845AMPFE#PBF 功能描述:IC REG CTRLR BUCK PWM CM 16TSSOP 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:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LT3845AMPFE#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 16TSSOP 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:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LT3845EFE 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Voltage Synchronous Current Mode Step-Down Controller with Adjustable Operating Frequency
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