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SC4524SETRT Datasheet

  • SC4524SETRT

  • Programmable Frequency, 2A Output 30V Step-Down Switching Re...

  • 21頁

  • SEMTECH   SEMTECH

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Programmable Frequency, 2A Output
30V Step-Down Switching Regulator
POWER MANAGEMENT
Description
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.
SC4524
Features
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
u
u
u
The SC4524 uses peak current-mode PWM control for
ease of compensation. Cycle-by-cycle current limit and
u
hiccup overload protection reduce power dissipation
u
during overload. Combined soft start and enable pin not
only eliminates output start up overshoot but also allows
power sequencing.
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
85
IN
D1
SS
C7
22nF
BST
Efficiency (%)
C2
1N4148
0.1mF
L1
80
OUT
5V/2A
R1
22.1k
SC4524
COMP
SW
75
70
65
60
55
4.7mH
FB
C6
22pF
R5
15.4k
C5
470pF
ROSC
R3
17.4k
GND
C3
10mF
D2
20BQ030
C1
22mF
R2
5.49k
L1: Coiltronics FP3-4R7
C1: Murata GRM21BR60J226M
C3: Murata GRM32ER71H106K
50
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

SC4524SETRT 產品屬性

  • 2,500

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器

  • -

  • 降壓（降壓）

  • -

  • 1

  • -

  • 2.8 V ~ 30 V

  • 電流模式

  • 1.4MHz

  • 2A

  • 無

  • -40°C ~ 85°C

  • 表面貼裝

  • 8-SOIC（0.154"，3.90mm 寬）

  • 帶卷 (TR)

  • 8-SOIC-EP

  • SC4524SETR

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