参数资料
| 型号： | SC4525DSETRT |
| 厂商： | Semtech |
| 文件页数： | 1/21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 ~ 16.74 V |
| 输入电压： | 3 V ~ 18 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 65kHz ~ 350kHz |
| 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： | SC4525DSEDKR |
SC4525D
POWER MANAGEMENT
Features
18V, 3A, 350kHz Step-Down
Switching Regulator
Description
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Input range: 3V to 8V
3A Output Current
350kHz Fixed Switching 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 SC4525D is a 350kHz constant frequency peak
current-mode step-down switching regulator capable of
producing 3A output current from an input ranging from
3V to 8V. The SC4525D is suitable for next generation
XDSL modems, high-definition TVs and various point of
load applications.
Peak current-mode PWM control employed in the
SC4525D achieves fast transient response with simple loop
compensation. Cycle-by-cycle current limiting and hiccup
overload protection reduces power dissipation during
output overload. Soft-start function reduces input start-
up current and prevents the output from overshooting
Applications
? XDSL and Cable Modems
Set Top Boxes
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Point of Load Applications
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CPE Equipment
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during power-up.
The SC4525D is available in SOIC-8 EDP package.
12
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DSP Power Supplies
LCD and Plasma TVs
Fig.1b: 350kHz 10-16V to 5V/3A Step-Down Converter (Front Page Efficien
Typical Application Circuit
SC4525A
IN
V
10 V – 16V
C4
10 m F
IN
SS/ EN
BST
SW
SC4525D
D1
1 N 4148
C1
0. 33 m F
L1
10 m H
R4
33.2k
OUT
5V/3A
90
85
80
75
70
Efficiency
V IN =12V
FB
65
COMP
RSET
GND
60
C7
22 nF
C8
47pF
R7
11.5k
C5
2.2 nF
R5
60.4 k
D2
20BQ030
R6
8.25k
C2
47 m F
55
50
45
40
L1 : Coiltronics CD1- 100
C2 : Murata GRM 31CR60J 476 M
C4 : Murata GRM 31CR61E 106 K
0
0.5
1 1.5 2
Load Current (A)
2.5
3
Figure 1 — 350kHz 10V - 16V to 5V/3A Step-down Converter
Efficiency of the 1MHz 10V-28V to 5V/3A Step-Down Converter (Front Pag
Revision5.0
- - ( )
Fig.1a : 350 kHz10V 16 V to5V/3 A Step Down Converter Front Page Schematic
? 20 Semtech Corporation
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