RT8251 Datasheet, PDF (1/16 Pages) Richtek Technology Corporation – 5A, 24V, 570kHz Step-Down Converter

®
RT8251
5A, 24V, 570kHz Step-Down Converter
General Description
The RT8251 is a monolithic step-down switch mode
converter with a built-in internal power MOSFET. It achieves
5A continuous output current over a wide input supply
range with excellent load and line regulation. Current mode
operation provides fast transient response and eases loop
stabilization.
The RT8251 provides protection functions such as
cycle-by-cycle current limiting and thermal shutdown. In
shutdown mode, the regulator draws 25μA of supply
current. Programmable soft-start minimizes the inrush
supply current and the output overshoot at initial startup.
The RT8251 requires a minimum number of external
components. The RT8251 is available in WQFN-16L 3x3
and SOP-8 (Exposed Pad) packages.
Pin Configurations
(TOP VIEW)
Features
z Wide Operating Input Voltage Range : 4.75V to 24V
z Adjustable Output Voltage Range : 0.8V to 15V
z Output Current up to 5A
z 25μA Low Shutdown Current
z Internal Power MOSFET : 70mΩ
z High Efficiency up to 95%
z 570kHz Fixed Switching Frequency
z Stable with Low ESR Output Ceramic Capacitors
z Thermal Shutdown Protection
z Cycle-By-Cycle Over Current Protection
z RoHS Compliant and Halogen Free
Applications
z Distributed Power Systems
z Battery Charger
z DSL Modems
z Pre-regulator for Linear Regulators
16 15 14 13
VIN 1
VIN 2
VIN 3
GND 4
GND
17
12 SW
11 SW
10 SW
9 BOOT
5678
WQFN-16L 3x3
BOOT
VIN
SW
GND
8
2
7
GND
3
6
9
4
5
SS
EN
COMP
FB
SOP-8 (Exposed Pad)
Ordering Information
RT8251
Package Type
QW : WQFN-16L 3x3 (W-Type)
SP : SOP-8 (Exposed Pad-Option 1)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Richtek products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8251-04 February 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1