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PDF B4251 Data sheet ( Hoja de datos )
| Número de pieza | B4251 | |
| Descripción | 250mA Low Dropout Voltage Regulators | |
| Fabricantes | ETC | |
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Bay Linear
Inspire the Linear Power
250mA Low Dropout Voltage Regulators
ON/OFF & BYPASS
B4251
Description
Features
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.
• 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
• Battery Powered Equipment
• Notebook PC, Palmtops, PDA
• Portable Cameras and Video Recorders
• Reference Voltage Sources
• Cellular / GSM / PCS Phones
Pin Connection
SOT-25 (K5)
Vout Bypass
54
123
Vin ON/OFF
GND
Top View
SOT-89 (R)
Vout
Vss
54
1 23
NC Vin On/Off
Top View
Ordering Information
Package
Part No.
SOT-25
B4251CK5-X.X
SOT-89
B4251CR-X.X
X.X = Fixed Output Voltages from 2.0V to 6.0V
ON/OFF (Enable) Function
Part No
B4251
ON/Off
High
Low
VOUT
ON
OFF
Bay Linear, Inc 2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
1 page  
Advance Information- These data sheets contain descriptions of products that are in development. The specifications are based on the engineering calculations,
computer simulations and/ or initial prototype evaluation.
Preliminary Information- These data sheets contain minimum and maximum specifications that are based on the initial device characterizations. These limits are
subject to change upon the completion of the full characterization over the specified temperature and supply voltage ranges.
The application circuit examples are only to explain the representative applications of the devices and are not intended to guarantee any circuit
design or permit any industrial property right to other rights to execute. Bay Linear takes no responsibility for any problems related to any
industrial property right resulting from the use of the contents shown in the data book. Typical parameters can and do vary in different
applications. Customer’s technical experts must validate all operating parameters including “ Typical” for each customer application.
LIFE SUPPORT AND NUCLEAR POLICY
Bay Linear products are not authorized for and should not be used within life support systems which are intended for surgical
implants into the body to support or sustain life, in aircraft, space equipment, submarine, or nuclear facility applications without
the specific written consent of Bay Linear President.
Bay Linear, Inc 2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
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