RT7271A Datasheet, PDF (1/14 Pages) Richtek Technology Corporation – 6A, 17V, 500kHz CSP Synchronous Step-Down Converter

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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.
Pin Configurations
(TOP VIEW)
A1
A2
A3
LX
LX LX
B1
B2
B3
VIN
GND GND
C1
C2
C3
COMP PGOOD BOOT
D1
D2
D3
FB
EN AGND
WL-CSP-12B 1.65x1.95 (BSC)
Features
z 4.5V to 17V Input Voltage Range
z 6A Output Current
z Current Mode Control
z 0.6V ± 1% Voltage Reference Over Temperature
z Latch Off when Short Circuit
z Monotonic Start-Up in Pre-biased Output
z 500kHz Switching Frequency
z Low On-Resistance
45mΩ of High Side MOSFET
25mΩ of Low Side MOSFET
z Cycle-by-Cycle Current Limit
z Power Good Monitor for UVP & OVP
z Input Under Voltage Lockout
z Thermal Shutdown
z RoHS Compliant and Halogen Free
Applications
z Industrial and Commercial Low Power Systems
z Computer Peripherals
z LCD Monitors and TVs
z Point of Load Regulation for High Performance DSPs,
FPGAs and ASICs
z Green Electronics/Appliances
Simplified Application Circuit
V_IN
VIN
BOOT
C_IN
RT7271A
PGOOD
R_PGOOD
3.3V
R3
V_IN
PGOOD
EN
LX
FB
COMP
GND AGND
C_{BOOT L}
R_C
C_P
C_C
V_OUT
R1
C_OUT
R2
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS7271A-00 February 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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