欢迎访问ic37.com |
会员登录 免费注册
发布采购

MIC2954-03BZ 参数 Datasheet PDF下载

MIC2954-03BZ图片预览
型号: MIC2954-03BZ
PDF下载: 下载PDF文件 查看货源
内容描述: 250毫安低压差稳压器 [250mA Low-Dropout Regulator]
分类和应用: 稳压器
文件页数/大小: 12 页 / 173 K
品牌: MICREL [ MICREL SEMICONDUCTOR ]
 浏览型号MIC2954-03BZ的Datasheet PDF文件第2页浏览型号MIC2954-03BZ的Datasheet PDF文件第3页浏览型号MIC2954-03BZ的Datasheet PDF文件第4页浏览型号MIC2954-03BZ的Datasheet PDF文件第5页浏览型号MIC2954-03BZ的Datasheet PDF文件第6页浏览型号MIC2954-03BZ的Datasheet PDF文件第7页浏览型号MIC2954-03BZ的Datasheet PDF文件第8页浏览型号MIC2954-03BZ的Datasheet PDF文件第9页  
MIC2954
Micrel
MIC2954
250mA Low-Dropout Regulator
General Description
The MIC2954 is a “bulletproof” efficient voltage regulator with
very low dropout voltage (typically 40mV at light loads and
375mV at 250mA), and low quiescent current (120µA typi-
cal). The quiescent current of the MIC2954 increases only
slightly in dropout, thus prolonging battery life. Key MIC2954
features include protection against reversed battery, fold-
back current limiting, and automotive load dump protection
(60V positive transient).
The MIC2954-07/08BM is an adjustable version that includes
an error flag output that warns of a low output voltage, which
is often due to failing batteries on the input. This may also be
used as a power-on reset. A logic-compatible shutdown input
is provided which enables the regulator to be switched on and
off. This part may be pin-strapped for 5V output, or pro-
grammed from 1.24V to 29V with the use of two external
resistors.
The MIC2954 is available in two voltage tolerances,
±0.5%
maximum and
±1%
maximum. Both are guaranteed for
junction temperatures from –40°C to +125°C.
The MIC2954 has a very low output voltage temperature
coefficient and extremely good load and line regulation
(0.04% typical).
Features
High-accuracy 5V, guaranteed 250mA 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
Error flag warns of low output voltage
Logic-controlled electronic shutdown
Output programmable from 1.24V to 29V
(MIC2954-07/08)
Available in TO-220, TO-92, and surface-mount
SOT-223 and SOP-8 packages
Battery powered equipment
Cellular telephones
Laptop, notebook, and palmtop computers
PCMCIA V
CC
and V
PP
regulation/switching
Bar code scanners
Automotive electronics
SMPS post-regulator/dc-to-dc modules
Voltage reference
High-efficiency linear power supplies
Applications
Typical Applications
100k
V
IN
MIC2954
IN
OUT
GND
2.2µF
V
OUT
V
IN
MIC2954
8
3
SHUTDOWN
ENABLE
V
ERR
V
OUT
1.2V to 30V
R1
10µF
R2
OUT
SHDN ERR
FB
GND
4
IN
1
5
7
100pF
V
REF
2, 6 = OPEN
5V Fixed Regulator
R1
V
OUT
=
V
REF
1
+
R2
Adjustable Regulator
V
IN
MIC2954-07/-08
+7V
8
1
IN
OUT
3
5
SHDN ERR
SHUTDOWN
ENABLE
100pF
V
OUT
5V or 3.3V
300k
1%
3.3µF
180k
1%
SHUTDOWN
ENABLE
V
IN
MIC2954-07/-08
8
3
FB
GND
4
7
OUT
SHDN ERR
FB
GND
4
IN
1
5
7
V
OUT
V
IN
*
* MINIMUM INPUT-TO-OUTPUT
VOLTAGE RANGES FROM
40mV TO 400mV DEPENDING
UPON LOAD CURRENT
220k
1%
470k
5V
3.3V
Q1 ON = 3.3V
Q1 OFF = 5.0V
Q1
2N2222
Wide Input-Voltage-Range Current Limiter
5V or 3V Selectable Regulator with Shutdown
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
August 1999
1
MIC2954