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参数资料
| 型号： | LT3845MPFE#TR |
| 厂商： | Linear Technology |
| 文件页数： | 1/26页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16TSSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 500kHz |
| 电源电压： | 4 V ~ 60 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -55°C ~ 125°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
LT3845
High Voltage Synchronous
Current Mode Step-Down
Controller with Adjustable
Operating Frequency
FEATURES
DESCRIPTION
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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 Ef?ciency 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,
The LT ? 3845 is a high voltage, synchronous, current
mode controller used for medium to high power, high
ef?ciency supplies. It offers a wide 4V to 60V input range
(7.5V minimum start-up voltage). An onboard regulator
simpli?es the biasing requirements by providing IC power
directly from V IN .
Burst Mode ? operation maintains high ef?ciency at light
loads by reducing IC quiescent current to 120μA. Light
load ef?ciency 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
12V and 42V Automotive and Heavy Equipment
48V Telecom Power Supplies
Avionics and Industrial Control Systems
Distributed Power Converters
16-Pin PDIP
APPLICATIONS
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TYPICAL APPLICATION
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.
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.
High Voltage Step-Down Regulator 48V to 12V at 75W
Ef?ciency and Power Loss vs
Load Current
V IN
20V TO 55V
2.2 μ F
0.1 μ F
100
V IN = 48V
7
100V
47 μ F
63V
82.5k
1M
1500pF
V IN
SHDN
C SS
LT3845
BOOST
TG
SW
BAS521
Si7370DP
15 μ H
0.01Ω
V OUT
12V
75W
95
90
85
6
5
4
16.2k
20k
2200pF
100pF
BURST_EN
V FB
V C
SYNC
V CC
BG
PGND
SENSE +
Si7370DP
B160
33μF
×3
80
75
70
LOSS
3
2
1
143k
49.9k
f SET
SGND
SENSE –
1μF
1N4148
65
0.1
1
10
0
LOAD CURENT (A)
3845 TA01a
3845 TA01b
3845fd
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3845MPFETRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage Synchronous Current Mode Step-Down Controller with Adjustable Operating Frequency |
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| LT3846J | 制造商:Linear Technology 功能描述:Current Mode PWM Controller 200mA 16-Pin CDIP |
| LT3846N | 制造商:LINER 制造商全称:Linear Technology 功能描述:Current Mode PWM Controller |
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