参数资料
| 型号： | SC4525CSETRT |
| 厂商： | Semtech |
| 文件页数： | 1/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A 8SOIC |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1 V ~ 26.88 V |
| 输入电压： | 3 V ~ 28 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 300kHz ~ 1.3MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm Width）裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-SOIC-EP |
| 其它名称： | SC4525CSEDKR |
SC4525C
28V 3A Step-Down Switching Regulator
POWER MANAGEMENT
Features
Description
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Wide input range: 3V to 28V
3A Output Current
200kHz to 2MHz Programmable Frequency
Precision V Feedback Voltage
Peak Current-Mode Control
Cycle-by-Cycle Current Limiting
Hiccup Overload Protection with Frequency Foldback
Soft-Start and Enable
Thermal Shutdown
Thermally Enhanced 8-pin SOIC Package
Fully RoHS and WEEE compliant
The SC4525C is a constant frequency peak current-mode
step-down switching regulator capable of producing 3A
output current from an input ranging from 3V to 28V. The
switching frequency of the SC4525C can be programmed
up to 2MHz for component miniaturization or it can be
set at lower frequencies to accommodate high step-down
ratios. The SC4525C is suitable for next generation XDSL
modems, high-definition TVs and various point of load
applications.
Peak current-mode PWM control employed in the
SC4525C achieves fast transient response with simple loop
Applications
compensation. Cycle-by-cycle current limiting and hiccup
overload protection reduces power dissipation during
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XDSL and Cable Modems
Set Top Boxes
Point of Load Applications
CPE Equipment
DSP Power Supplies
LCD and Plasma TVs
Automotive Car Audio
output overload. Soft-start function reduces input start-
up current and prevents the output from overshooting
during power-up.
The SC4525C is available in SOIC-8 EDP package.
SC4525A
Typical Application Circuit
Efficiency
IN
V IN
10V– 28V
C4
4.7 m F
SS/EN
SC4525C
BST
SW
D1
1N4148
C1
0.33 m F
L1
5.2 m H
R4
33.2k
OUT
5V/3A
90
80
70
V IN = 12V
V IN = 24V
FB
60
COMP
ROSC
GND
C7
22nF
C8
22pF
R7
12.7k
C5
2.2nF
R5
15.8k
D2
20BQ030
R6
8.25k
C2
10 m FX3
50
40
0.0
0.5
1.0
1.5
2.0
2.5
3.0
L1: Coiltronics CD1- 5R2
C2: Murata GRM31CR60J106K
C4: Murata GRM32ER71H475K
Figure 1. 1MHz 10V -28V to 5V/3A Step-down Converter
Load Current (A)
Efficiency of the 1MHz 10V-28V to 5V/3A Step-Down Conve
Revision5.
? 20 Semtech Corporation
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