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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=25C IO = 10mA to 1.0Amp, unless otherwise specified) Parameter Symbol Conditions
Reference Voltage VO 1117-adj, IOUT=10mA, VIN-VOUT=2V, TJ=25C 1.5V(VIN-VOUT) 5.75V 10mAIOUTIFULL LOAD (VOUT+1.5)VIN7V, 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 10mAIOUTIFULL LOAD T= 25 C 1117-1.8 IOUT=10mA, VIN=3.8V, TJ=25C 0IOUT1.0Amp, 3.2VVIN7V 1117-2.5 IOUT=10mA, VIN=4.5V, TJ=25C 0IOUT1.0Amp, 4.0VVIN7V 1117-2.85 IOUT=10mA, VIN=4.85V, TJ=25C 0IOUT1.0Amp, 4.35VVIN7V 1117-3.3 IOUT=10mA, VIN=5.0V, TJ=25C 0IOUT1.0Amp, 4.8VVIN7V 1117-5.0 IOUT=10mA, VIN=6.0V, TJ=25C 0IOUT1.0Amp, 6.5VVIN7V 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=22F, COUT=22F 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 % % A 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 10F (tantalum)or 50F (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 B1117 stability. The value of ESR can vary from the type of capacitor used in the applications. The recommended value for ESR is 0.5. The output capacitance could increase in size to above the minimum value. The larger value of output capacitance as high as 100F can improve the load transient response. Maximum Junction Temperature range: TJ = Tambient (max) + PD* thermal resistance (Junction-toambient) Maximum Junction temperature must not exceed the 125C.
10V
SOLDERING METHODS
The B1117 SOT-223 package is designed to be compatible with infrared reflow or vapor-phase reflow soldering techniques. During soldering the non-active or mildly active fluxes may be used. The B1117 die is attached to the heat sink lead which exits opposite the input, output, and ground pins. Hand soldering and wave soldering should be avoided since these methods can cause damage to the device with excessive thermal gradients on the package. The SOT-223 recommended soldering method are as follows: vapor phase reflow and infrared reflow with the component preheated to within 65C of the soldering temperature range.
+
2.85V
B1117-2.85
+
10uF
10uF
27K ..
PO = (10V - 2.85)(105mA) = (7.15)(105mA) = 750mW
Fig. 1. Circuit Layout, Thermal Experiments.
THERMAL CHARACTERISTICS
The thermal resistance of B1117 is 15C/W from junction to tab and 31 C/W from tab to ambient for a total of 46 C/W from junction to ambient. The B1117 features the internal thermal limiting to protect the device during overload conditions. Special care needs to be taken during continues load conditions the maximum junction temperature does not exceed 125 C. Taking the FR-4 printed circuit board and 1/16 thick with 1 ounce copper foil as an experiment (fig.1 & fig.2), the PCB material is effective at transmitting heat with the tab attached to the pad area and a ground plane layer on the backside of the substrate. Refer to table 1 for the results of the experiment. The thermal interaction from other components in the application can effect the thermal resistance of the B1117. The actual thermal resistance can be determined with experimentation. B1117 power dissipation is calculated as follows: PD = (VIN - VOUT)(IOUT)
50 X 50 mm
35 X 17 mm
16 X 10 mm
Fig. 2. Substrate Layout for SOT-223
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B1117
TOTAL PC BOARD AREA 2500mm 2500mm 2500mm 2500mm 2500mm 1600mm 2500mm 2500mm 1600mm 900mm 900mm TOPDIDE COPPER AREA 2500mm 1250mm 950mm 2500mm 1800mm 600mm 1250mm 915mm 600mm 240mm 240mm BACKSIDE COPPER AREA 2500mm 2500mm 2500mm 0 0 1600mm 0 0 0 900mm 0 THERMAL RESISTANCE JUNCTION TO AMBIENT 46C/W 47C/W 49C/W 51C/W 53C/W 55C/W 58C/W 59C/W 67C/W 72C/W 85C/W
VIN C1
IN
BAY B1117
ADJ
OUT
VIN C1
R1
IN
BAY B1117
ADJ
OUT C2 R1
VOUT
LOAD
VOUT= VREF(1+R2/R1) +ADJ
R2
1.0Amp Current output
Typical Adjustable Regulator
Bay Linear, Inc
2418 Armstrong Street, Livermore, CA 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B1117
SOT223 Package
0.124 0.116
0.146 0.295 0.130 0.264
0.0905 NOM 0.181 NOM
0.041 0.033
0.146 0.130 0.0040 0.0008 0.264 0.248
16C 10C 16C 10C Max
0.014 0.010
0.033 0.025
16C 10C
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) 606-5950, Fax: (925) 940-9556
www.baylinear.com

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