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LP2951 参数 Datasheet PDF下载

LP2951图片预览
型号: LP2951
PDF下载: 下载PDF文件 查看货源
内容描述: 百毫安,低功耗,低压差稳压器 [100 mA, Low Power Low Dropout Voltage Regulator]
分类和应用: 稳压器
文件页数/大小: 24 页 / 194 K
品牌: ONSEMI [ ON SEMICONDUCTOR ]
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LP2950, LP2951, NCV2951
100 mA, Low Power Low
Dropout Voltage Regulator
The LP2950 and LP2951 are micropower voltage regulators that are
specifically designed to maintain proper regulation with an extremely
low input−to−output voltage differential. These devices feature a very
low quiescent bias current of 75
mA
and are capable of supplying
output currents in excess of 100 mA. Internal current and thermal
limiting protection is provided.
The LP2951 has three additional features. The first is the Error
Output that can be used to signal external circuitry of an out of
regulation condition, or as a microprocessor power−on reset. The
second feature allows the output voltage to be preset to 5.0 V, 3.3 V or
3.0 V output (depending on the version) or programmed from 1.25 V
to 29 V. It consists of a pinned out resistor divider along with direct
access to the Error Amplifier feedback input. The third feature is a
Shutdown input that allows a logic level signal to turn−off or turn−on
the regulator output.
Due to the low input−to−output voltage differential and bias current
specifications, these devices are ideally suited for battery powered
computer, consumer, and industrial equipment where an extension of
useful battery life is desirable. The LP2950 is available in the three
pin case 29 and DPAK packages, and the LP2951 is available in the
eight pin dual−in−line, SOIC−8 and Micro8 surface mount packages.
The ‘A’ suffix devices feature an initial output voltage tolerance
±
0.5%.
Features
http://onsemi.com
TO−92
Z SUFFIX
CASE 29
1
23
Pin: 1. Output
2. Ground
3. Input
4
1 2
3
DPAK
DT SUFFIX
CASE 369C
PIN CONNECTIONS
Pin: 1. Input
2. Ground
3. Output
1
2
3
(Top View)
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
SOIC−8
D SUFFIX
CASE 751
PDIP−8
N SUFFIX
CASE 626
Micro8E
DM SUFFIX
CASE 846A
Pb−Free Packages are Available
Low Quiescent Bias Current of 75
mA
Low Input−to−Output Voltage Differential of 50 mV at 100
mA
and
380 mV at 100 mA
5.0 V, 3.3 V or 3.0 V
±0.5%
Allows Use as a Regulator or Reference
Extremely Tight Line and Load Regulation
Requires Only a 1.0
mF
Output Capacitor for Stability
Internal Current and Thermal Limiting
NCV Prefix for Automotive and Other Applications Requiring Site
and Control Changes
8
1
8
1
8
1
PIN CONNECTIONS
Output 1
Sense 2
Shutdown 3
GND 4
(Top View)
8
7
6
5
Input
Feedback
V
O
Tap
Error Output
LP2951 Additional Features
Error Output Signals an Out of Regulation Condition
Output Programmable from 1.25 V to 29 V
Logic Level Shutdown Input
(See Following Page for Device Information.)
ORDERING & MARKING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on pages 14 and 16 of this data sheet.
See general marking information in the device marking
section on page 18 of this data sheet.
©
Semiconductor Components Industries, LLC, 2006
1
December, 2006 − Rev. 19
Publication Order Number:
LP2950/D