BAYLI B1129S-ADJ, B1129N-ADJ Datasheet

Bay Linear, Inc

2418 Armstrong Street, Livermore, CA 94550 Tel: [phone], Fax: [phone] www.baylinear.com

1.00Amp High Current Low Dropout

B1129/B1129-3.3/B1129-5.0

Voltage Regulator Adjustable & Fix

Pin Connection

Ordering Information

Devices Package Temp.

B1129N-X SOT-223

-40 °C to 125 °C

B1129S TO-263

-40 °C to 125 °C

Description

The Bay Linear B1129 is a 1 Amp high accuracy, low dropout
voltage regulator with only 40mV at light loads and
450mV(Typ.)@ 1.0A) and low quiescent current of 240µA typical.

The B1129 is designed for low voltage a application that requires
lower dropout voltage and faster transient response. This device is
an excellent choice for use in powering low voltage applications
where require a lower dropout, faster transient response and as a
post regulator for switching supplies applications.

The B1129 offers full protection against over-current faults,
reversed input polarity, reversed load insertion, and positive and
negative transient voltage. On-Chip trimming adjusts the reference
voltage to 1%. The B1129-xx devices are in 3 pin fixed voltage

regulators. The B1129 include an Enable pin in the 5 pin packages

.

The B1129are offered in a 3 & 5-pin SOT-223 & TO-263 package
compatible with other 3 terminal regulators. .

Features

• High output accuracy of 2% 3.3V & 5.0V

• Output Adjustable from 1.24V to 26V

• Output Current of 1.00A

• Low Dropout Voltage

• Low quiescent current

• Extremely Tight Load & Line Regulation

• Reverse-battery and “Load Dump” Protection

• Zero Current Shutdown Mode (5-pin version)

• Offer in TO-263, & SOT-223

• Similar to industry Standard LT1129

Applications

• Powering VGA & Sound Card

• LCD Monitor

• Battery Powered Equipments/Laptop & Notebook

• SMPS Post Regulator / DC to DC Modules

• High Efficiency Linear Power Supply

• Adjustable Power Supply

• Bar Code Scanners

Bay Linear

Inspire the Linear Power

TO-263-5 Package

Top View

45

BAY

B2941

321

GND

OUPUT

1)

3)

4)

5)

2)

ADJ

OUT

ON/OFF

GND

OUPUT

1)

3)

4)

5)

2)

ADJ

OUT

ON/OFF

TO-263-5 Package

Top View

45

BAY

B1129

321

1)1)

IN

OUTAdj/GND

Front View

SOT-223

OUT

GNDIN

Tab GND

Front View

SOT-223

Bay Linear, Inc

2418 Armstrong Street, Livermore, CA 94550 Tel: [phone], Fax: [phone] www.baylinear.com

B1129

ABSOLUTE MAXIMUM RATINGS

Lead Temp. (Soldering, 5 Seconds).................................260°C Input Voltage ........................................................26V

Storage Temperature Range.............................. -65° to +150°C Maximum Output Current....................................3.5A

Operating Junction Temperature Range Input Supply Voltage (Note1) (Survival)-20V to +60V

B1129/2941 Control Section..................... -45°C +125°C

B1129/2941 Power Transistor.................... -45°C +150°C

ELECTRICAL CHARACTERISTICS (NOTE 1) at I

OUT

= 5mA, V

IN

=V

OUT

+ 1V, I l = 1000mA, C L = 10µF. Ta=25°C, unless otherwise

specified. The B1129 is programmed to output 5V and has V

SHUTDOWN

≤ 0.6V

PARAMETER CONDITIONS Typ B1129

Min Max

Units

3.3V Version2.

Output Voltage (Note 2)

I

OUT

= 5mA

5mA ≤I

OUT

≤1.00A, 4.75V≤V

IN

≤26V

3.30

3.30

3.250

3.200

3.350

3.400

V

5.0V Version

Output Voltage (Note 2)

I

OUT

= 5mA

5mA ≤I

OUT

≤1.00A, 5.5V≤V

IN

≤26V

5.00

5.00

4.925

4.850

5.075

5.150

V

Output Voltage
Accuracy

5mA ≤I

OUT

≤1.0 A

-1

-2

-2.5

1

2

2.5

%

All Voltage Options

Line Regulation

IO = 5mA, (V

OUT

+ 1V) ≤ VIN≤ 26V

1.5

10 mA

Load Regulation

VIN = V

OUT

+ 5V, 5mA ≤ I

OUT

≤ 1 A

(Note 2, 6)

6 20 mA

IO = 10mA

40 200

IO = 500mA

370 450

Dropout Voltage

I

O

= 1.00A

450 550

mV

Ground Current IO = 10mA, VIN = V

OUT

, +1V

I

O

= 500mA, VIN = V

OUT

, +1V

I

O

= 1.00A

310

25
50

450

45
80

µA

mA

I

GNDDO

Ground Pin Current at

Dropout

VIN = 0.5V less than specified V

OUT IOUT

= 10mA 0.9

mA

Current Limit

V

OUT

= 0V (Note 4) 1.7 1.5

A

Output Noise Voltage
(10Hz to 100kHz)
I

L

= 100mA

CL = 10µF

C

L

= 33µF

400

260

µV

RMS

Reference Voltage

1.235 1.223

1.210

1.247

1.260

V

V

max

Reference Voltage

(Note 8)`

1.204 1.266

V

Adjust Pin
Bias Current

40 80

120

nA

Reference Voltage
Temperature
Coefficient

(Note 7) 20

ppm/°C

Adjust Pin Bias
Current Temperature
Coefficient

0.1

nA/°C