B4251CR
| Model | B4251CR |
| Description | 250mA Low Dropout Voltage Regulators |
| PDF file | Total 5 pages (File size: 175K) |
| Chip Manufacturer | ETC |
Bay Linear
Inspire the Linear Power
250mA Low Dropout Voltage Regulators
ON/OFF & BYPASS
B4251
Description
The B4251 series are a group of positive output voltage,
five-pin regulators, which provide a high current even
when the input/output voltage differential is small. Low
power consumption and high accuracy is achieved
though CMOS and programmable fuse technologies.
Output voltage: 2.0V to 6.0V in 0.1V increments.
The B4251 consists of a high-precision voltage
reference, an error correction circuit, and a current
limited output driver. Key features include a Shutdown
Pin that reduces supply current to 0.5µA max and a
470pF Bypass input to ground reduces noise present on
the internal reference, which in turn significantly reduce
output noise. If output noise is not concern, this input
maybe left unconnected. Larger capacitor values cap be
used, but results in longer time period to rated output
voltage when power initially applied.
The ON/OFF pin enables the output to be turned off,
resulting in reduced power consumption. Provided in
SOT-25 (150mW) packages minimizes the usage of
board real state.
Features
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Maximum Output Current: 250 mA.
Highly Accurate Output Voltage +/- 1.4%
Only 19µA Power Consumption MAX
Shutdown Supply Current 1µA
Ground Current of Less than 5µA
Very Low Dropout
0.12V at 100mA
0.23V at 250mA
Shutdown Mode for Power Savings
With ON/OFF & BYPASS Features
Offered in SOT-89 & SOT-25 Packages
PIN-to-PIN S-818
Applications
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Battery Powered Equipment
Notebook PC, Palmtops, PDA
Portable Cameras and Video Recorders
Reference Voltage Sources
Cellular / GSM / PCS Phones
Pin Connection
Ordering Information
Package
SOT-25
SOT-89
Part No.
B4251CK5-X.X
B4251CR-X.X
SOT-25 (K5)
SOT-89 (R)
X.X = Fixed Output Voltages from 2.0V to 6.0V
V
out
5
1
2
Bypass
4
3
V
out
5
Vss
4
ON/OFF (Enable) Function
Part No
B4251
ON/Off
High
Low
V
OUT
ON
OFF
1
2
3
V
in
ON/OFF
GND
NC
V
in
On/Off
Top View
Top View
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
