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RT7257GLZSP 数据手册 - Richtek（立锜）
制造商:
Richtek（立锜）
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RT7257GLZSP数据手册
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RT7257G
®
DS7257G-01 September 2012 www.richtek.com
1
Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
©
Applications
z Wireless AP/Router
z Set-Top-Box
z Industrial and Commercial Low Power Systems
z LCD Monitors and TVs
z Green Electronics/Appliances
z Point of Load Regulation of High-Performance DSPs
3A, 18V, 800kHz Synchronous Step-Down Converter
General Description
The RT7257G is a high efficiency, monolithic synchronous
step-down DC/DC converter that can deliver up to 3A
output current from a 4.5V to 18V input supply. The
RT7257G's current mode architecture and external
compensation allow the transient response to be
optimized over a wide input voltage range and loads.
Cycle-by-cycle current limit provides protection against
shorted outputs, and soft-start eliminates input current
surge during start-up. The RT7257G also provides under
voltage protection and thermal shutdown protection. The
low current (<3μA) shutdown mode provides output
disconnection, enabling easy power management in
battery-powered systems. The RT7257G is available in
an SOP-8 (Exposed Pad) package.
Features
zz
zz
z
±±
±±
±1.5% High Accuracy Reference Voltage
zz
zz
z 4.5V to 18V Input Voltage Range
zz
zz
z 3A Output Current
zz
zz
z Integrated N-MOSFET Switches
zz
zz
z Current Mode Control
zz
zz
z Fixed Frequency Operation : 800kHz
zz
zz
z Output Adjustable from 0.8V to 12V
zz
zz
z Up to 95% Efficiency
zz
zz
z Programmable Soft-Start
zz
zz
z Stable with Low ESR Ceramic Output Capacitors
zz
zz
z Cycle-by-Cycle Current Limit
zz
zz
z Input Under Voltage Lockout
zz
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z Output Under Voltage Protection
zz
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z Thermal Shutdown Protection
zz
zz
z RoHS Compliant and Halogen Free
Simplified Application Circuit
Marking Information
RT7257GxZSP : Product Number
x : H or L
YMDNN : Date Code
RT7257Gx
ZSPYMDNN
VIN
EN
GND
BOOT
FB
SW
L
R1
R2
V
OUT
V
IN
RT7257G
SS
C
SS
COMP
C
C
R
C
C
BOOT
C
IN
C
OUT
R
EN
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