參數(shù)資料
型號： MIC2954-08BM
廠商： MICREL INC
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： 250mA Low-Dropout Regulator
中文描述： FIXED/ADJUSTABLE POSITIVE LDO REGULATOR, 0.6 V DROPOUT, PDSO8
封裝： SOIC-8
文件頁數(shù)： 1/12頁
文件大小： 170K
代理商： MIC2954-08BM
August 1999
1
MIC2954
MIC2954
Micrel
MIC2954
250mA Low-Dropout Regulator
Micrel, Inc. 1849 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 http://www.micrel.com
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
Applications
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
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 (120
μ
A 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).
Typical Applications
MIC2954
IN
OUT
GND
2.2μF
V
IN
V
OUT
5V Fixed Regulator
SHUTDOWN
ENABLE
MIC2954-07/-08
IN
SHDN
OUT
ERR
GND
3.3μF
V
+7V
V
5V or 3.3V
FB
300k
1%
100pF
180k
1%
Q1 ON = 3.3V
Q1 OFF = 5.0V
1
3
8
5
7
4
220k
1%
470k
Q1
2N2222
5V
3.3V
5V or 3V Selectable Regulator with Shutdown
SHUTDOWN
ENABLE
MIC2954
IN
SHDN
OUT
ERR
GND
10μF
V
IN
V
1.2V to 30V
FB
R1
100pF
R2
100k
V
ERR
2, 6 = OPEN
1
3
8
5
7
4
V
REF
V
V
1
R1
R2
OUT
REF
=
+
Adjustable Regulator
SHUTDOWN
ENABLE
MIC2954-07/-08
IN
SHDN
OUT
ERR
GND
V
IN
V
OUT
≈
V
IN
*
FB
* MINIMUM INPUT-TO-OUTPUT
VOLTAGE RANGES FROM
40mV TO 400mV DEPENDING
UPON LOAD CURRENT
1
3
8
5
7
4
Wide Input-Voltage-Range Current Limiter
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MIC2954-08BM TR 功能描述:IC REG LDO 5V/ADJ .25A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:3.8V 輸入電壓:最高 16V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.3V @ 80mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:80mA 電流 - 限制（最小）:- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:帶卷 (TR) 其它名稱:MIC5203-3.8BM5TRMIC5203-3.8BM5TR-ND
MIC2954-08YM 功能描述:低壓差穩(wěn)壓器 - LDO Improved LP2954 Low Drop-out Regulator (Lead Free ) RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
MIC2954-08YM TR 功能描述:低壓差穩(wěn)壓器 - LDO Improved LP2954 Low Drop-out Regulator (Lead Free ) RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
MIC2954-08YM 制造商:Micrel Inc 功能描述:Linear Voltage Regulator IC
MIC2954-08YMTR 制造商:Micrel 功能描述:LDO Regulator Pos 1.24V to 29V5V 0.25A
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