BAYLI B4251CK5-6.0, B4251CK5-5.9, B4251CK-4.8, B4251CK-4.7, B4251CK-4.6 Datasheet

Bay Linear

Inspire the Linear Power

250mA Low Dropout Voltage Regulators		B4251
ON/OFF & BYPASS

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

•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

Ordering Information

								SOT-89 (R)
Vout				Bypass				Vout				Vss
								5			4
5				4
1			2		3			1	2		3
Vin				ON/OFF				NC		Vin	On/Off
			GND

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	ON/Off	VOUT
	B4251	High	ON
		Low	OFF

Top View

Top View

Bay Linear, Inc 2478 Armstrong Street, Livermore, CA 94550 Tel: [phone], Fax: [phone]

www.baylinear.com

B4251

Absolute Maximum Ratings

Parameter

Symbol

Ratings

Units

Input Voltage

VIN

12

V

Output Current

IOUT

500

mA

Output Voltage

VOUT

VSS -0.3 to VIN 0.3

V

On/Off Voltage

On/Off

VSS -0.3 to VIN+ 0.3

V

Continual Total Power Dissipation

SOT-25

Pd

150

mW

SOT-89

300

Operating Ambient Temperature

TOPR

-30 to 80

°C

Storage Temperature

TSTG

-40 to 125

°C

Electrical Characteristics (Ta = 25°C, VIN = VOUT + 0.5V; unless otherwise noted)

Parameter

Conditions

MIN

TYP

MAX

UNIT

Output Voltage Accuracy

IO = 1mA

-1.4%

-

+1.4%

V

IO = 0 to 150mA

-2%

-

+2%

Line Regulation

IO= 100mA,

0.2

0.3

%/V

∆VOUT/∆VIN-VOUT

(VOUT + 0.1V)<VIN<6V

Load Regulation

VIN 6V, 0mA < IO < 120mA COUT = 1µF

0.01

0.04

%/mV

Maximum Output Current

250

mA

Current Limit

160

500

Shutdown Supply Current

TA=25°C

0.01

1

µA

Shutdown Input Bias Current

VSHDN=VIN, TA=25°C

0.01

100

nA

Shutdown Exit Delay

CBP=0µF COUT=1µF, IO = 1mA

30

150

µsec

Shutdown Input Threshold Low

Vin=2.5 to 5.5V

0.4

V

Shutdown Input Threshold High

Vin=2.5 to 5.5V

2

V

Ground Pin Current

IOUT = 0mA……150mA

2

5

µA

Dropout Voltage

IO = 150mA

160

250

mV

IO = 250 mA

200

280

Thermal Shutdown Temperature

155

°C

Marking Format

SOT-25

FXWW

F = B4251

Variables

X = Voltage Codes

WW = Work Week Code

B = 2.0

F =

3.3

SOT-25 = 01 to 99

C = 2.5

G =

3.5

D = 2.8

H =

5.0

E = 3.0

Bay Linear, Inc 2478 Armstrong Street, Livermore, CA 94550 Tel: [phone], Fax: [phone]

www.baylinear.com