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Bay Linear
Inspire the Linear Power
1.00Amp High Current Low Dropout
Voltage Regulator Adjustable & Fix
B1129/B1129-3.3/B1129-5.0
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
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 240A 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. .
*
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
Pin Connection
Ordering Information
Devices
B1129N-X B1129S
Package
SOT-223 TO-263
Temp.
-40 C to 125 C -40 C to 125 C
TO-263-5 Package
1) OUT BAY B1129 B2941 1 2345 2) ADJ 3) GND 4) ON/OFF 5) OUPUT
SOT-223 Tab GND
Top View
Adj/GND OUT IN IN GND OUT Front View
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
B1129
ABSOLUTE MAXIMUM RATINGS
Lead Temp. (Soldering, 5 Seconds).................................260C Storage Temperature Range.............................. -65 to +150C Operating Junction Temperature Range B1129/2941 Control Section ..................... -45C +125C B1129/2941 Power Transistor....................-45C +150C Input Voltage ........................................................26V Maximum Output Current....................................3.5A Input Supply Voltage (Note1) (Survival)-20V to +60V
ELECTRICAL CHARACTERISTICS (NOTE 1) at IOUT = 5mA, V IN =V OUT + 1V, I l = 1000mA, C L = 10F. Ta=25C, unless otherwise specified. The B1129 is programmed to output 5V and has V SHUTDOWN 0.6V
PARAMETER
3.3V Version2.
CONDITIONS
IOUT = 5mA 5mA IOUT1.00A, 4.75VVIN 26V IOUT = 5mA 5mA IOUT1.00A, 5.5VVIN 26V 5mA IOUT1.0 A IO = 5mA, (VOUT + 1V) VIN 26V VIN = VOUT + 5V, 5mA IOUT 1 A (Note 2, 6)
Typ Min
3.30 3.30 5.00 5.00 3.250 3.200 4.925 4.850 -1 -2 -2.5
B1129 Max
3.350 3.400 5.075 5.150 1 2 2.5 10 20 200 450 550 450 45 80
Units
V
Output Voltage (Note 2)
5.0V Version
Output Voltage (Note 2) Output Voltage Accuracy
All Voltage Options
V %
Line Regulation Load Regulation Dropout Voltage
1.5 6 40 370 450 310 25 50 0.9 1.7 400 260 1.235 1.223 1.210 1.204 1.5
mA mA mV
IO = 10mA IO = 500mA IO = 1.00A
Ground Current IGNDDO Ground Pin Current at Dropout Current Limit Output Noise Voltage (10Hz to 100kHz) IL = 100mA Reference Voltage Reference Voltage Adjust Pin Bias Current Reference Voltage Temperature Coefficient Adjust Pin Bias Current Temperature Coefficient
IO = 10mA, VIN = VOUT, +1V IO = 500mA, VIN = VOUT, +1V IO = 1.00A
VIN = 0.5V less than specified VOUT IOUT = 10mA VOUT = 0V (Note 4) CL = 10F CL = 33F
A mA mA A V RMS
(Note 8) 40 (Note 7) 20
1.247 1.260 1.266 80 120
V Vmax V nA ppm/C
0.1
nA/C
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
B1129
ENABLE Input B1129
Input Logic Voltage Low (OFF) High (ON) V 0.8 2.4 VEN = 26V VEN = 0.8V (Note 10) 10 500 100 600 750 2.5 5 V A A
Enable Pin Input Current Regulator Output Current in Shutdown
NOTES:
The Bold specifications apply to the full operating temperature range. Note 1: Maximum positive supply voltage of 60V must be of limited duration (<100msec) and duty cycle.) The maximum continuous supply voltage is 26V. Note 2: Full load current (IFL) is defined as 1.00A for the B1129. Note 3: Dropout voltage is defined as the input-to output differential when the output voltage drops to 99% of its nominal value with VOUT + 1V applied to VIN. Note 4: VIN = VOUT (NOMINAL) +1V. For example, use VIN= 4.3V for a 3.3V regulator. Employ pulse-testing procedures to minimize temperature rise. Note 5: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current to the ground current. Note 6: Output voltage temperature coefficient is defined as the worst case voltage changed divided by the total temperature range. Note 7: Thermal regulation is defined as the change in the output voltage at a time T after a change in power dissipation is applied, excluding load or line regulation effects. Specifications are for a 200mA load pulse as VIN = 20V (a 4W pulse) for T = 10ms. Note 8: VREF VOUT (VIN - 1), 2.3V VIN 26V, 10mA < IL IFL, TJ TJMAX Note 9: Comparator threshold is expressed in terms of a voltage differential at the Adjust terminal below the nominal reference voltage measured 6V input. To express these thresholds in terms of output voltage change, multiply the error amplifier gain = VOUT/VREF = (R1 + R2)/R2. For example, at a programmable output voltage of 5V, the Error output is guaranteed to go low when the output drops by 95mVx 5V/ 1.240V = 38mV. Threshold remains constant as a percent of VOUT as VOUT is varied, with the dropout warning occurring at typically 5% below nominal, 7.7% guaranteed. Note 10: VEN 0.8V and VIN 26V, VOUT = 0.
BLOCK DIAGRAM
IN
OUT
O.V ILIMIT
FLAG
+ -
1.180V
Reference
1.240V
+ -
28V
R1*
ADJ EN
Thermal Shutdown
R2*
GND
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com
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
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556
www.baylinear.com

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