®
RT7271A
6A, 17V, 500kHz CSP Synchronous Step-Down Converter
General Description
The RT7271A is a high efficiency, synchronous step-down
DC/DC converter for applications operating from 4.5V to
17V and requiring up to 6A maximum load. The current
mode architecture of RT7271A allows the transient
response to be optimized. Cycle-by-cycle current limit
provides protection against shorted output and soft-start
eliminates input current surge during start-up. Fault
conditions also include output under voltage protection,
output over voltage protection, and thermal shutdown. The
low current shutdown mode provides output disconnect,
enabling easy power management in battery powered
systems.
Features
4.5V to 17V Input Voltage Range
6A Output Current
Current Mode Control
0.6V
±
1% Voltage Reference Over Temperature
Latch Off when Short Circuit
Monotonic Start-Up in Pre-biased Output
500kHz Switching Frequency
Low On-Resistance
45mΩ of High Side MOSFET
Ω
25mΩ of Low Side MOSFET
Ω
Cycle-by-Cycle Current Limit
Power Good Monitor for UVP & OVP
Input Under Voltage Lockout
Thermal Shutdown
RoHS Compliant and Halogen Free
Pin Configurations
(TOP VIEW)
A1
A2
A3
Applications
Industrial and Commercial Low Power Systems
Computer Peripherals
LCD Monitors and TVs
Point of Load Regulation for High Performance DSPs,
FPGAs and ASICs
Green Electronics/Appliances
LX
B1
LX
B2
LX
B3
VIN
C1
GND
C2
GND
C3
COMP
D1
PGOOD
D2
BOOT
D3
FB
EN
AGND
WL-CSP-12B 1.65x1.95 (BSC)
Simplified Application Circuit
V
IN
C
IN
PGOOD
PGOOD
R3
V
IN
EN
FB
COMP
R
C
C
C
C
P
R2
VIN
BOOT
RT7271A
LX
R
PGOOD
3.3V
R1
C
OUT
C
BOOT
L
V
OUT
GND AGND
Copyright
©
2013 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS7271A-00 February 2013
www.richtek.com
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
