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Bay Linear
Inspire the Linear Power
1.0Amp Low Dropout Voltage Regulator
Adjustable & Fix (0.40Volt Dropout)
B1117
Description
The Bay Linear B1117 is a three terminal positive NPN regulator offered as adjustable or fix voltages of 1.5V,1.8V, 2.5V, 2.85V, 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 B1117 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 B1117 Dropout of 0.40 V in for B1117A Adjustable & Fix 1.5V, 1.8V, 2.5V, 2.85V, 3.0V, 3.3V, 5.0V 0.05% Load Regulation Current & Thermal Limiting Lower Cost SOT-89 Package Available in SOT-223, and TO-252, TO-263 & SO-8 Similar to industry Standard LT1117
•
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
B1117D-X B1117N-X B1117T-X B1117S-X B1117M-X
Package
TO-252 TO-223 TO-220 TO-263 SO-8
Temp.
0 °C to 125 °C 0 °C to 125 °C 0 °C to 125 °C 0 °C to 125 °C 0 °C to 125 °C
8-Pin Surface Mount
ADJ NC OUT OUT 1 2 3 4 8 7 6 5 IN IN
SOT -223 Tab V OUT
SOT-223-5 SOT-223 Tab V OUT
IN
N.C.
#1 Sense #2 Adj/GND #3 OUT #4 Control #5 VIN
5
TO-252
5 4 3 2 1 VPOWER VCONTROL OUTPUT ADJ/GND. SENSE
Top View
Adj/GND OUT IN Front View
1
2
3
4
Front View
1
2
3
TO-263-5 Package
ADJ/GN VOUT VIN
Front
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B1117
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 1117-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
1.238 1.225 -2%
TYP
1.250 1.250 0.005
MAX
1.262 1.275 +2% 0.2
UNIT
V V %
Line Regulation (1)
REG (line)
Load Regulation (1)
REG (LOAD)
Output Voltage
VO
(Vin-Vout)=2V 10mA≤IOUT≤IFULL LOAD T= 25 °C 1117-1.8 IOUT=10mA, VIN=3.8V, TJ=25°C 0≤IOUT≤1.0Amp, 3.2V≤VIN≤7V 1117-2.5 IOUT=10mA, VIN=4.5V, TJ=25°C 0≤IOUT≤1.0Amp, 4.0V≤VIN≤7V 1117-2.85 IOUT=10mA, VIN=4.85V, TJ=25°C 0≤IOUT≤1.0Amp, 4.35V≤VIN≤7V 1117-3.3 IOUT=10mA, VIN=5.0V, TJ=25°C 0≤IOUT≤1.0Amp, 4.8V≤VIN≤7V 1117-5.0 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)
0.05
0.5
1.782 1.746 2.475 2.450 2.820 2.790 3.267 3.235 4.950 4.900
1.80 1.80 2.50 2.50 2.85 2.85 3.30 3.30 5.00 5.00 0.80 0.80 0.35
1.818 1.854 2.525 2.550 2.880 2.910 3.333 3.365 5.050 5.100 1.00 1.10 0.40
V V V V V
Dropout Voltage
VD VD IS IMIN LOAD TA TS RA
V V A mA %/W % % µA dB °C °C
Dropout Voltage Current Limit Minimum Load Current Temperature Regulation Long Term Stability Temperature Stability Adjust pin Current Ripple Rejection Thermal Shutdown Thermal Shutdown Hysterics
1.0 10
1.1
60
0.004 0.03 0.5 35 75 155 10
0.02 1.0 120
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
B1117
TYPICAL CHRACTRISTICS
B1117-2.85
B1117-ADJ
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B1117
TYPICAL CHRACTRISTICS (Continued)
B1117-2.85
B1117-5.0
B1117-2.85
B1117-5.0 Line Transient Response
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B1117
APPLICATION NOTES EXTERNAL CAPACITOR
To ensure the stability of the B1117 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 o.