参数资料
型号: SC4524SETRT
厂商: Semtech
文件页数: 1/21页
文件大小: 0K
描述: IC REG BUCK 2A 8SOIC
标准包装: 1
类型: 降压(降压)
输出数: 1
输入电压: 2.8 V ~ 30 V
PWM 型: 电流模式
频率 - 开关: 1.4MHz
电流 - 输出: 2A
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
包装: 标准包装
供应商设备封装: 8-SOIC-EP
产品目录页面: 1358 (CN2011-ZH PDF)
其它名称: SC4524SEDKR
SC4524
Programmable Frequency, 2A Output
30V Step-Down Switching Regulator
POWER MANAGEMENT
Description
Features
The SC4524 is an adjustable frequency peak current-
mode step-down switching regulator with an integrated
2.3A, 30V switch. The SC4524 can be programmed up
to 1.5MHz. This allows the use of small inductor and
ceramic capacitors, resulting in very compact power
supplies. The SC4524 is suitable for next generation XDSL
modems, set-top boxes and point of load applications.
The SC4524 uses peak current-mode PWM control for
ease of compensation. Cycle-by-cycle current limit and
hiccup overload protection reduce power dissipation
during overload. Combined soft start and enable pin not
only eliminates output start up overshoot but also allows
power sequencing.
u
u
u
u
u
u
u
u
u
Up to 1.5 MHz Programmable Switching Frequency
2.3A Integrated Switch
Wide Input Voltage Range 2.8V to 30V
Peak Current-Mode Control with Cycle-by-Cycle
Current Limiting
Hiccup Overload Protection
Soft-Start and Enable
Thermal Shutdown
Thermally Enhanced 8-Pin SOIC Package
Fully WEEE and RoHS Compliant
The SC4524 is available in SOIC-8 EDP package.
Applications
u
u
u
u
u
u
XDSL and Cable Modems
Set-top Boxes
Point of Load Applications
CPE Equipment
DSP Power Supplies
Disk Drives
Typical Application Circuit
Efficiency
90
V IN
24V
IN
D1
85
0.1 m F
C7
22nF
SS
SC4524
BST
SW
C2 1N4148
L1
4.7 m H
R1
22.1k
OUT
5V/2A
80
75
70
COMP
FB
C6
22pF
R5
15.4k
C5
470pF
ROSC
R3
17.4k
GND
C3
10 m F
D2
20BQ030
C1
22 m F
R2
5.49k
65
60
55
L1: Coiltronics FP3-4R7
C1: Murata GRM21BR60J226M
50
C3: Murata GRM32ER71H106K
0.0
0.5
1.0
1.5
2.0
Load Current (A)
Figure 1. 1MHz 24V to 5V/2A Step-down Converter.
Revision: December 30th, 2006
1
www.semtech.com
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