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LM22678TJ-ADJ/NOPB 数据手册 - TI（德州仪器）
制造商:
TI（德州仪器）
分类:
DC/DC转换器
封装:
TO-263-7
描述:
TEXAS INSTRUMENTS LM22678TJ-ADJ/NOPB 直流-直流开关降压(逐步递减)稳压器, 可调, 4.5V-42V输入, 1.285V-37V输出, 5A输出, TO-263-7
Pictures:
3D模型
符号图
焊盘图
引脚图
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页面导航:
引脚图在P4Hot
原理图在P1P8
封装尺寸在P2P3P20
型号编码规则在P2
封装信息在P2P3
功能描述在P1
技术参数、封装参数在P5P6
应用领域在P1P23
电气规格在P5P6P10P12P14P16
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LM22678TJ-ADJ/NOPB数据手册
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LM22670/LM22670Q
June 22, 2012
42V, 3A SIMPLE SWITCHER
®
, Step-Down Voltage
Regulator with Features
General Description
The LM22670 switching regulator provides all of the functions
necessary to implement an efficient high voltage step-down
(buck) regulator using a minimum of external components.
This easy to use regulator incorporates a 42V N-channel
MOSFET switch capable of providing up to 3A of load current.
Excellent line and load regulation along with high efficiency
(>90%) are featured. Voltage mode control offers short mini-
mum on-time, allowing the widest ratio between input and
output voltages. Internal loop compensation means that the
user is free from the tedious task of calculating the loop com-
pensation components. Fixed 5V output and adjustable out-
put voltage options are available. The default switching
frequency is set at 500 kHz allowing for small external com-
ponents and good transient response. In addition, the fre-
quency can be adjusted over a range of 200 kHz to 1MHz with
a single external resistor. The internal oscillator can be syn-
chronized to a system clock or to the oscillator of another
regulator. A precision enable input allows simplification of
regulator control and system power sequencing. In shutdown
mode the regulator draws only 25 µA (typ.). Built in soft-start
(500µs, typ) saves external components. The LM22670 also
has built in thermal shutdown, and current limiting to protect
against accidental overloads.
The LM22670 is a member of Texas Instruments' SIMPLE
SWITCHER
®
family. The SIMPLE SWITCHER™ concept
provides for an easy to use complete design using a minimum
number of external components and the TI WEBENCH
®
de-
sign tool. TI's WEBENCH
®
tool includes features such as
external component calculation, electrical simulation, thermal
simulation, and Build-It boards for easy design-in.
Features
■
Wide input voltage range: 4.5V to 42V
■
Internally compensated voltage mode control
■
Stable with low ESR ceramic capacitors
■
120 mΩ N-channel MOSFET TO-263 THIN package
■
100 mΩ N-channel MOSFET PSOP-8 package
■
Output voltage options:
-ADJ (outputs as low as 1.285V)
-5.0 (output fixed to 5V)
■
±1.5% feedback reference accuracy
■
500 kHz default switching frequency
■
Adjustable switching frequency and synchronization
■
-40°C to 125°C operating junction temperature range
■
Precision enable pin
■
Integrated boot-strap diode
■
Integrated soft-start
■
Fully WEBENCH
®
enabled
■
LM22670Q is an Automotive Grade product that is AEC-
Q100 grade 1 qualified (-40°C to +125°C operating
junction temperature)
Package
■
PSOP-8 (Exposed Pad)
■
TO-263 THIN (Exposed Pad)
Applications
■
Industrial Control
■
Telecom and Datacom Systems
■
Embedded Systems
■
Conversions from Standard 24V, 12V and 5V Input Rails
Simplified Application Schematic
30076001
© 2012 Texas Instruments Incorporated 300760 SNVS584N www.ti.com
LM22670/LM22670Q 42V, 3A SIMPLE SWITCHER
®
, Step-Down Voltage Regulator with Features
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