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MIC2940A-12WU 参数 Datasheet PDF下载

MIC2940A-12WU图片预览
型号: MIC2940A-12WU
PDF下载: 下载PDF文件 查看货源
内容描述: 1.2A低压差稳压器 [1.2A Low-Dropout Voltage Regulator]
分类和应用: 稳压器
文件页数/大小: 11 页 / 325 K
品牌: MICREL [ MICREL SEMICONDUCTOR ]
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MIC2940A/2941A
1.2A Low-Dropout Voltage Regulator
General Description
The MIC2940A and MIC2941A are “bulletproof” efficient
voltage regulators with very low dropout voltage (typically
40mV at light loads and 350mV at 1A), and low quiescent
current (240µA typical). The quiescent current of the
MIC2940A increases only slightly in dropout, thus
prolonging battery life. Key MIC2940A features include
protection against reversed battery, fold-back current
limiting, and automotive “load dump” protection (60V
positive transient).
The MIC2940 is available in both
fixed
voltage (3.3V, 5V,
and 12V) and adjustable voltage configurations. The
MIC2940A-xx devices are three pin,
fixed
voltage
regulators. A logic-compatible shutdown input is provided
on the adjustable MIC2941A, which enables the regulator
to be switched on and off.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
High output voltage accuracy
Guaranteed 1.25A output
Low quiescent current
Low dropout voltage
Extremely tight load and line regulation
Very low temperature coefficient
Current and thermal limiting
Input can withstand –20V reverse battery and +60V
positive transients
Logic-controlled electronic shutdown
Output programmable from 1.24V to 26V(MIC2941A)
Available in TO-220, TO-263, TO-220-5, and TO-263-5
packages.
Applications
Battery powered equipment
Cellular telephones
Laptop, notebook, and palmtop computers
PCMCIA VCC and VPP regulation/switching
Bar code scanners
Automotive electronics
SMPS post-regulator/ DC-to-DC modules
Voltage reference
High efficiency linear power supplies
___________________________________________________________________________________________________________
Pin Configuration
1
2
3
1
2 3
4
5
TO-263-3
(MIC2940A-xxBU/WU)
1
2
3
TO-263-5
(MIC2941ABU/WU)
MIC2941A Pinout
1) Adjust
2) Shutdown
3) Ground
4) Input
5) Output
1 2 3 4
5
TO-220-3
(MIC2940A-xxBT/WT)
MIC2940A Pinout
1) Input
2) Ground
3) Output
TO-220-5
(MIC2941ABT/WT)
The TAB is Ground on TO-220 and TO-263 packages
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
July 2007
M9999-071307