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LM20124MH/NOPB 其他数据使用手册 - National Semiconductor（美国国家半导体）
制造商:
National Semiconductor（美国国家半导体）
封装:
eTSSOP-16
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
引脚图在P2Hot
典型应用电路图在P1P13P21
原理图在P9P21
封装尺寸在P24P25P26P27
焊盘布局在P28
标记信息在P24
封装信息在P24P25P26
技术参数、封装参数在P3
应用领域在P1
电气规格在P3P4P5P6P7P8
导航目录
LM20124MH/NOPB数据手册
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PVIN
SW
AGND
FB
PGOOD
EN
SS/TRK
AVIN
COMP
LM20124
L
R
F
VCC
PGND
C
IN
R
C1
C
C1
V
IN
C
SS
C
VCC
C
OUT
V
OUT
R
FB2
R
FB1
C
F
(optional)
LM20124, LM20124-Q1
www.ti.com
SNVS507F –OCTOBER 2007–REVISED MARCH 2013
4A, 1MHz PowerWise
®
Synchronous Buck Regulator
Check for Samples: LM20124, LM20124-Q1
1
FEATURES
DESCRIPTION
2
• LM20124-Q1 is AEC-Q100 qualified and
The LM20124 is a full featured 1 MHz synchronous
manufactured on an Automotive Grade Flow
buck regulator capable of delivering up to 4A of
• Input voltage range 2.95V to 5.5V
continuous output current. The current mode control
• Accurate current limit minimizes inductor size
loop can be compensated to be stable with virtually
any type of output capacitor. For most cases,
• 96% efficiency at 1 MHz switching frequency
compensating the device only requires two external
• 32 mΩ integrated FET switches
components, providing maximum flexibility and ease
• Starts up into pre-biased loads
of use. The device is optimized to work over the input
voltage range of 2.95V to 5.5V making it suited for a
• Output voltage tracking
wide variety of low voltage systems.
• Peak current mode control
The device features internal over voltage protection
• Adjustable output voltage down to 0.8V
(OVP) and over current protection (OCP) circuits for
• Adjustable Soft-Start with external capacitor
increased system reliability. A precision enable pin
• Precision enable pin with hysteresis
and integrated UVLO allows the turn-on of the device
to be tightly controlled and sequenced. Start-up
• Integrated OVP, UVLO, power good and
inrush currents are limited by both an internally fixed
thermal shutdown
and externally adjustable Soft-Start circuit. Fault
• TSSOP 16 pin exposed pad package
detection and supply sequencing is possible with the
integrated power good circuit.
APPLICATIONS
The LM20124 is designed to work well in multi-rail
• Simple to design, high efficiency point of load
power supply architectures. The output voltage of the
regulation from a 5V or 3.3V bus
device can be configured to track a higher voltage rail
using the SS/TRK pin. If the output of the LM20124 is
• High Performance DSPs, FPGAs, ASICs and
pre-biased at startup it will not sink current to pull the
microprocessors
output low until the internal soft-start ramp exceeds
• Broadband, Networking and Optical
the voltage at the feedback pin.
Communications Infrastructure
The LM20124 is offered in a 16-pin TSSOP package
with an exposed pad that can be soldered to the
PCB, eliminating the need for bulky heatsinks.
Typical Application Circuit
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2007–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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