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參數資料
| 型號： | LT3845EN#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封裝： | LEAD FREE, PLASTIC, DIP-16 |
| 文件頁數： | 1/26頁 |
| 文件大小： | 248K |
| 代理商： | LT3845EN#TRPBF |
LT3845
1
3845fd
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
High Voltage Synchronous
Current Mode Step-Down
Controller with Adjustable
Operating Frequency
The LT
3845 is a high voltage, synchronous, current
mode controller used for medium to high power, high
efciency supplies. It offers a wide 4V to 60V input range
(7.5V minimum start-up voltage). An onboard regulator
simplies the biasing requirements by providing IC power
directly from VIN.
Burst Mode
operation maintains high efciency at light
loads by reducing IC quiescent current to 120μA. Light
load efciency is also improved with the reverse inductor
current inhibit function which supports discontinuous
operation.
Additional features include adjustable xed operating
frequency that can be synchronized to an external clock
for noise sensitive applications, gate drivers capable of
driving large N-channel MOSFETs, a precision undervoltage
lockout, 10μA shutdown current, short-circuit protection
and a programmable soft-start.
The LT3845 is available in a 16-lead thermally enhanced
TSSOP package and 16-pin through hole N package.
■
High Voltage Operation: Up to 60V
■
Synchronizable Up to 600kHz
■
Adjustable Constant Frequency: 100kHz to 500kHz
■
Output Voltages Up to 36V
■
Adaptive Nonoverlap Circuitry Prevents Switch
Shoot-Through
■
Reverse Inductor Current Inhibit for Discontinuous
Operation Improves Efciency with Light Loads
■
Programmable Soft-Start
■
120μA No Load Quiescent Current
■
10μA Shutdown Supply Current
■
1% Regulation Accuracy
■
Standard Gate N-Channel Power MOSFETs
■
Current Limit Unaffected by Duty Cycle
■
Reverse Overcurrent Protection
■
16-Lead Thermally Enhanced TSSOP Package,
16-Pin PDIP
■
12V and 42V Automotive and Heavy Equipment
■
48V Telecom Power Supplies
■
Avionics and Industrial Control Systems
■
Distributed Power Converters
High Voltage Step-Down Regulator 48V to 12V at 75W
Efciency and Power Loss vs
Load Current
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.
VIN
SHDN
CSS
BURST_EN
VFB
VC
SYNC
fSET
BOOST
TG
SW
VCC
BG
PGND
SENSE+
SENSE–
SGND
BAS521
1N4148
3845 TA01a
0.1μF
1500pF
Si7370DP
B160
15μH
0.01Ω
LT3845
1μF
33μF
×3
VOUT
12V
75W
1M
82.5k
16.2k
VIN
20V TO 55V
2.2μF
100V
49.9k
20k
100pF
2200pF
143k
47μF
63V
LOAD CURENT (A)
65
80
75
70
100
95
90
85
0
3
2
1
7
6
5
4
3845 TA01b
EFFICIENCY(%)
POWER
LOSS
(W)
0.1
10
1
VIN = 48V
LOSS
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LT3845IFE | 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 |
| LT3845IFE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 切換控制器 系列:- 標準包裝:2,000 系列:- PWM 型:電流模式 輸出數:1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無 升壓:是 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR) |
| LT3845IFE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 切換控制器 系列:- 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數: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 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:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LT3845IFEPBF | 制造商:Linear Technology 功能描述:Step-Down Controller TSSOP16EP |
| LT3845IFE-PBF | 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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