®
RT7263B
3A, 21V 500kHz Synchronous Step-Down Converter
General Description
The RT7263B is a synchronous step-down regulator with
an internal power MOSFET. It achieves 3A of 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.
Fault condition protection includes cycle-by-cycle current
limiting and thermal shutdown. An adjustable soft-start
reduces the stress on the input source at startup.
The RT7263B requires a minimal number of readily
available external components, providing a compact
solution.
Features
Wide Input Range : 4.5V to 21V
Adjustable Output from 0.603V to 15V
3A Output Current
120mΩ/40mΩ Internal Power MOSFET Switch
Ω
Ω
Internal Compensation Minimizes External Parts
500kHz Fixed Switching Frequency
Synchronized External Clock from 300kHz to 2MHz
Adjustable Soft-Start
Cycle-by-Cycle Over Current Limit
Thermal Shutdown Protection
Small 14-Lead WDFN Package
RoHS Compliant and Halogen Free
Ordering Information
RT7263B
Package Type
QW : WDFN-14L 4x3 (W-Type)
Lead Plating System
Z : ECO (Ecological Element with
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.
Applications
Distributive Power Systems
Battery Charger
DSL Modems
Pre-Regulator for Linear Regulators
Marking Information
10 : Product Code
10 YM
DNN
YMDNN : Date Code
Simplified Application Circuit
V
IN
C
IN
VCC
C
C
R
T
SYNC
ON/OFF
SYNC
EN
AGND
FB
C
SS
SS
GND
R2
VIN
BOOT
RT7263B
SW
R1
C
OUT
C
BOOT
L
V
OUT
Copyright
©
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS7263B-01
September 2012
www.richtek.com
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RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
