Document
Bay Linear
Inspire the Linear Power
1.0Amp Low Dropout Voltage Regulator
Adjustable & Fix (0.40Volt Dropout)
B033
Description
The Bay Linear B033 is a three terminal positive NPN regulator offered as adjustable or fix voltages of 1.8V, 2.5V, 3.0V, 3.3V, and 5Volts. The output current has a capability up to 1.0Amp,. This device has been optimized for low voltage where transient response and minimum input voltage are critical. The 2.85V version is designed specifically to be used in active terminators for SCSI bus. Current limit is trimmed to ensure specified output current and controlled short-circuit current. On-Chip thermal limiting provides protection against any combination of overload and ambient temperatures that would create excessive junction temperatures. The B033 is offered in a 3-pin SOT-223, and TO-252 (DPAK) packages compatible with other 3 terminal regulators. 5-pin version in TO-263 with lower dropout of 0.4 volt is available.
Features
• • • • • • • • Adjustable Output Down to 1.2V Output Current of 1.0Amp Low Dropout 1.0V for B033 Dropout of 0.40 V in for B033A Adjustable & Fix 1.8V, 2.5V, 3.0V, 3.3V, 5.0V Current & Thermal Limiting Lower Cost SOT-89 Package Available in SOT-223, and TO-252, & TO-263 Similar to industry BAOOT/FP
•
Applications
• • • • • • Active SCSI terminators High efficiency Linear Regulator Post regulators fro Switching Supplies Battery Charger 5V to 3.3V linear Regulators Motherboard Clock Supplies
Pin Connection
Ordering Information
Devices
B033D-X B033N-X B033T-X B033S-X
Package
TO-252 TO-223 TO-220 TO-263
Temp.
0 °C to 125 °C 0 °C to 125 °C 0 °C to 125 °C 0 °C to 125 °C
TO-252
SOT-223 Tab V GND
SOT-223-5 SOT-223 Tab V OUT
1
2
3
VCC GND Adj/GND OUT OUT IN Front View
Vcc GND Vout
Front View
1 2 3 4 5
#1 Sense #2 Adj/GND #3 OUT #4 Control #5 VIN
5 4 3 2 1
VPOWER VCONTROL OUTPUT ADJ/GND. SENSE
TO-263-5 Package
Front View
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B033
Absolute Maximum Rating
Parameter
Maximum Input Voltage Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering 10 Sec.)
Min
0 -65
Max
7.0 125 150 300
Unit
V °C
Electrical Characteristics
(VIN = 7V; TJ=25°C IO = 10mA to 1.0Amp, unless otherwise specified) Parameter Symbol Conditions
Reference Voltage VO B033-adj, IOUT=10mA, VIN-VOUT=2V, TJ=25°C 1.5V≤(VIN-VOUT) ≤5.75V 10mA≤IOUT≤IFULL LOAD (VOUT+1.5)≤VIN≤7V, IOUT=10mA
MIN
1.213 1.200 -3%
TYP
1.250 1.250
MAX
1.288 1.300 +3% 0.6
UNIT
V V %
Line Regulation (1)
REG (line)
0.010
Load Regulation (1)
REG (LOAD)
Output Voltage
VO
(Vin-Vout)=2V 10mA≤IOUT≤IFULL LOAD T= 25 °C B033-1.8 IOUT=10mA, VIN=3.8V, TJ=25°C 0≤IOUT≤1.0Amp, 3.2V≤VIN≤7V B033-2.5 IOUT=10mA, VIN=4.5V, TJ=25°C 0≤IOUT≤1.0Amp, 4.0V≤VIN≤7V B033-3.0 IOUT=10mA, VIN=4.85V, TJ=25°C 0≤IOUT≤1.0Amp, 4.35V≤VIN≤7V B033-3.3 IOUT=10mA, VIN=5.0V, TJ=25°C 0≤IOUT≤1.0Amp, 4.8V≤VIN≤7V B033-5.0 IOUT=10mA, VIN=6.0V, TJ=25°C 0≤IOUT≤1.0Amp, 6.5V≤VIN≤7V Control Input VPOWER=VOUT+0.8, ILOAD =10mA VPOWER=VOUT+0.8, ILOAD =1.0Amp, Power Input VCONTROL=VOUT-+2.5V, ILOAD=1.0Amp, (Vin-Vout)=2V 1.5V≤(VIN-VOUT) ≤5.75V T= 25 °C, 30ms pulse T= 25 °C, 1000Hrs T= 25 °C F=120Hz, CADJ=22µF, COUT=22µF Tantalum IOUT=IFULL LOAD, (Vin-Vout)=3V (Note 5)
0.10 1.710 2.375 2.850 3.13 4.750 1.80 2.50 3.00 3.30 5.00
0.9 1.890 2.625 3.150 3.470 5.250 V V V V V
Dropout Voltage (3 pin)
VD VD IS IMIN LOAD TA TS RA
Dropout Voltage (5pin) Current Limit Minimum Load Current Temperature Regulation Long Term Stability Temperature Stability Adjust pin Current Ripple Rejection Thermal Shutdown Thermal Shutdown Hysterics
0.80 0.80 0.35 1.0 10 0.004 0.03 0.5 35 75 155 10 1.1
1.00 1.10 0.40
V V A mA %/W % % µA dB °C °C
0.02 1.0 120
60
Thermal Resistance Junction to case SOT-223 DD Package 15 3.0 15 3.0 °C/W
Note: Output Switch tests are performed under pulsed conditions to minimize power dissipation
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B033
TYPICAL CHRACTRISTICS
B033-2.85
B033-ADJ
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B033
TYPICAL CHRACTRISTICS (Continued)
B033-2.85
B033-5.0
B033-2.85
B033-5.0 Line Transient Response
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B033
APPLICATION NOTES EXTERNAL CAPACITOR
To ensure the stability of the B033 an output capacitor of at least 10µF (tantalum)or 50µF (aluminum) is required. The value may change based on the application requirements on the output load or temperature range. The capacitor equivalent series resistance (ESR) will effect the B033 stability. The value of ESR can vary from the type of capacitor used in the applications. The recommended value for ESR is 0.5Ω. The output capacitance could increase in size to .