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PDF SC4625 Data sheet ( Hoja de datos )
| Número de pieza | SC4625 | |
| Descripción | 1.7MHz High Efficiency Monolithic 0.5A Synchronous Buck Converter | |
| Fabricantes | Semtech | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC4625 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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POWER MANAGEMENT
Description
SC4625 is a BiCMOS integrated FET, synchronous, 0.5A
step-down regulator. It operates at the typical switching
frequency of 1.7MHz and enables the user to choose a
very small and inexpensive external output inductor and
capacitor.
Fully internally compensated current-mode control loop
provides a fast transient response and ensures excellent
line and load regulation. The SC4625 operates from 2.5V
to 5.5V, features internal P-MOS and N-MOS power switches
and is implemented as a current-mode pulse-width-
modulated (PWM) control scheme.
Multiple modes of operation are available to achieve high
performance and efficiency and makes the SC4625 ideally
suited for electronic devices where size is at premium.
These modes are: PWM fixed frequency, synchronous and
asynchronous load dependent, pulse-skipping at very light
load, and low-dropout 100% duty cycle mode, by
continuously turning on the upper P-MOSFET.
SC4625
1.7MHz High Efficiency Monolithic
0.5A Synchronous Buck Converter
www.DataSheet4U.com
Features
Fully integrated MOSFET switches and compensation
1.7MHz fixed frequency operation
Input voltage range: 2.5V to 5.5V
Adjustable output voltage from 0.5V to VIN
Pulse-skipping mode operation at light load
100% duty cycle in low-dropout mode
Over-temperature shutdown
MLP-10 lead free package. This product is fully WEEE
and RoHS compliant
-40°C to +125°C junction temperature range
Applications
WLAN and Bluetooth® applications
Distributed Power Systems
Micro DC-DC converters
USB-based DSL modems
Point-of-Load Regulation
FPGA Core and I/O Supplies
Set-top Boxes
Battery-powered devices (1 Li -Ion or 3 NiMh/NiCd)
Typical Application Circuit
Vin
C1
L1
1 PH
U1
SC4625
GND 10
2 VIN
GND 9
3 NC
NC 8
4 NC
REG 7
5 EN
FB 6
C2
C3
R1
R2
+
Vout
_
Revision: November 30, 2005
1
www.semtech.com
1 page  
POWER MANAGEMENT
Block Diagram
REG
SC4625
www.DataSheet4U.com
VIN
EN Oscillator
0.5V
Slope
REF Comp
Regulator
Current
Limit
Switching
Logic
Gate
Driver
Zero
PWM
Detect
FB EA
PH
GND
2005 Semtech Corp.
5
www.semtech.com
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet SC4625.PDF ] | |
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