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RT7257DLZSP 数据手册 - Richtek（立锜）
制造商:
Richtek（立锜）
分类:
稳压芯片
封装:
SOP-8
描述:
RICHTEK RT7257DLZSP 直流-直流开关降压(逐步递减)稳压器, 可调, 4.5V-18V输入, 800mV-12V输出, 3A输出, SOP-8
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RT7257DLZSP数据手册
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RT7257D
®
DS7257D-04 September 2012 www.richtek.com
1
©
Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Ordering Information
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.
Pin Configurations
(TOP VIEW)
Applications
Wireless AP/Router
Set-Top-Box
Industrial and Commercial Low Power Systems
LCD Monitors and TVs
Green Electronics/Appliances
Point of Load Regulation of High-Performance DSPs
SOP-8 (Exposed Pad)
3A, 18V, 1.2MHz Synchronous Step-Down Converter
General Description
The RT7257D 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
RT7257D'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 RT7257D 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 RT7257D is available in
an SOP-8 (Exposed Pad) package.
Features
±±
±±
±1.5% High Accuracy Reference Voltage
4.5V to 18V Input Voltage Range
3A Output Current
Integrated N-MOSFET Switches
Current Mode Control
Fixed Frequency Operation : 1.2MHz
Output Adjustable from 0.8V to 12V
Pin-Short Matrix Feature
Up to 95% Efficiency
Programmable Soft-Start
Cycle-by-Cycle Over Current Protection
Input Under Voltage Lockout
Output Under Voltage Protection
Thermal Shutdown Protection
RoHS Compliant and Halogen Free
BOOT
VIN
SW
GND
SS
EN
FB
COMP
GND
2
3
4
5
6
7
8
9
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
RT7257D
Lead Plating System
Z : ECO (Ecological Element with
Halogen Free and Pb free)
H : UVP Hiccup
L : UVP Latch-Off
Marking Information
RT7257DxZSP : Product Number
x : H or L
YMDNN : Date Code
RT7257Dx
ZSPYMDNN
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