Adjustable (0.40Volt Dropout) B1117 Description Linear

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Adjustable (0.40Volt Dropout) B1117 Description Linear

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1.0Amp Dropout Voltage Regulator
Adjustable (0.40Volt Dropout)
B1117
Description
Linear B1117 three terminal positive regulator offered adjustable voltages 1.5V,1.8V, 2.5V, 2.85V, 3.3V, 5Volts. output current capability 1.0Amp,. This device been optimized voltage where transient response minimum input voltage critical. 2.85V version designed specifically used active terminators SCSI bus. Current limit trimmed ensure specified output current controlled short-circuit current. On-Chip thermal limiting provides protection against combination overload ambient temperatures that would create excessive junction temperatures. B1117 offered 3-pin SOT-223, TO-252 (DPAK) packages compatible with other terminal regulators. 5-pin version TO-263 with lower dropout volt available.
Features
Adjustable Output Down 1.2V Output Current 1.0Amp Dropout 1.0V B1117 Dropout 0.40 B1117A Adjustable 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 SOT-223, TO-252, TO-263 TO-252 version) Similar industry Standard LT1117
Applications
Active SCSI terminators High efficiency Linear Regulator Post regulators Switching Supplies Battery Charger 3.3V linear Regulators Motherboard Clock Supplies
Connection
Ordering Information
Devices
B1117D-X B1117N-X B1117S-X
Package
TO-252 TO-223 TO-263
Temp.
TO-252
-223
SOT-223 SOT-223-5
Adj/GND Front View
Sense Adj/GND Control
VPOWER VCONTROL OUTPUT ADJ/GND. SENSE
ADJ/GN VOUT
Front View
TO-263-5 Package
Front
Linear,
2478 Armstrong Street, Livermore, 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 Sec.)
Unit
Electrical Characteristics
(VIN TJ=25°C 10mA 1.0Amp, unless otherwise specified) Parameter Symbol Conditions
Reference Voltage 1117-adj, IOUT=10mA, VIN-VOUT=2V, TJ=25°C 1.5V(VIN-VOUT) 5.75V 10mAIOUTIFULL LOAD (VOUT+1.5)VIN7V, IOUT=10mA
1.238 1.225
1.250 1.250 0.005
1.262 1.275
UNIT
Line Regulation
(line)
Load Regulation
(LOAD)
Output Voltage
(Vin-Vout)=2V 10mAIOUTIFULL LOAD 1117-1.8 IOUT=10mA, VIN=3.8V, TJ=25°C 0IOUT1.0Amp, 3.2VVIN7V 1117-2.5 IOUT=10mA, VIN=4.5V, TJ=25°C 0IOUT1.0Amp, 4.0VVIN7V 1117-2.85 IOUT=10mA, VIN=4.85V, TJ=25°C 0IOUT1.0Amp, 4.35VVIN7V 1117-3.3 IOUT=10mA, VIN=5.0V, TJ=25°C 0IOUT1.0Amp, 4.8VVIN7V 1117-5.0 IOUT=10mA, VIN=6.0V, TJ=25°C 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 30ms pulse 1000Hrs F=120Hz, CADJ=22µF, COUT=22µF Tantalum IOUT=IFULL LOAD, (Vin-Vout)=3V (Note
0.05
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 1.00 1.15 0.35
1.818 1.854 2.525 2.550 2.880 2.910 3.333 3.365 5.050 5.100 1.15 1.30 0.55
Dropout Voltage
°C/W
Dropout Voltage Current Limit Minimum Load Current Temperature Regulation Long Term Stability Temperature Stability Adjust Current Ripple Rejection Thermal Shutdown Thermal Shutdown Hysterics
IMIN LOAD
0.004 0.03
0.02
Thermal Resistance Junction case SOT-223 Package
Note: Output Switch tests performed under pulsed conditions minimize power dissipation
Linear,
2478 Armstrong Street, Livermore, 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
Linear,
2478 Armstrong Street, Livermore, 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B1117
APPLICATION NOTES EXTERNAL CAPACITOR
ensure stability B1117 output capacitor least 10µF (tantalum)or 50µF (aluminum) required. value change based application requirements output load temperature range. capacitor equivalent series resistance (ESR) will effect B1117 stability. value vary from type capacitor used applications. recommended value 0.5. output capacitance could increase size above minimum value. larger value output capacitance high 100µF improve load transient response. Maximum Junction Temperature range: Tambient (max) thermal resistance (Junction-toambient) Maximum Junction temperature must exceed 125°C.
SOLDERING METHODS
B1117 SOT-223 package designed compatible with infrared reflow vapor-phase reflow soldering techniques. During soldering non-active mildly active fluxes used. B1117 attached heat sink lead which exits opposite input, output, ground pins. Hand soldering wave soldering should avoided since these methods cause damage device with excessive thermal gradients package. SOT-223 recommended soldering method follows: vapor phase reflow infrared reflow with component preheated within 65°C soldering temperature range.
2.85V
B1117-2.85
10uF
10uF
(10V 2.85)(105mA) (7.15)(105mA) 750mW
Fig. Circuit Layout, Thermal Experiments.
THERMAL CHARACTERISTICS
thermal resistance B1117 15°C/W from junction °C/W from ambient total °C/W from junction ambient. B1117 features internal thermal limiting protect device during overload conditions. Special care needs taken during continues load conditions maximum junction temperature does exceed Taking FR-4 printed circuit board 1/16 thick with ounce copper foil experiment (fig.1 fig.2), material effective transmitting heat with attached area ground plane layer backside substrate. Refer table results experiment. thermal interaction from other components application effect thermal resistance B1117. actual thermal resistance determined with experimentation. B1117 power dissipation calculated follows: (VIN VOUT)(IOUT)
Fig. Substrate Layout SOT-223
Linear,
2478 Armstrong Street, Livermore, 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com
B1117
TOTAL 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 1600mm 900mm THERMAL RESISTANCE JUNCTION AMBIENT 46°C/W° 47°C/W° 49°C/W° 51°C/W° 53°C/W° 55°C/W° 58°C/W° 59°C/W° 67°C/W° 72°C/W° 85°C/W°
B1117
B1117
VOUT
LOAD
VOUT= VREF(1+R2/R1) +ADJ
Typical Adjustable Regulator
1.0Amp Current output
Linear,
2478 Armstrong Street, Livermore, 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 0.181
0.041 0.033
0.146 0.130 0.0040 0.0008 0.264 0.248
16°C 10°C 16°C 10°C
0.014 0.010
0.033 0.025
16°C 10°C
Advance Information- These data sheets contain descriptions products that development. specifications based engineering calculations, computer simulations and/ initial prototype evaluation. Preliminary Information- These data sheets contain minimum maximum specifications that based initial device characterizations. These limits subject change upon completion full characterization over specified temperature supply voltage ranges.
application circuit examples only explain representative applications devices intended guarantee circuit design permit industrial property right other rights execute. Linear takes responsibility problems related industrial property right resulting from contents shown data book. Typical parameters vary different applications. Customer's technical experts must validate operating parameters including Typical" each customer application.
LIFE SUPPORT NUCLEAR POLICY Linear products authorized should used within life support systems which intended surgical implants into body support sustain life, aircraft, space equipment, submarine, nuclear facility applications without specific written consent Linear President.
Linear,
2478 Armstrong Street, Livermore, 94550 Tel: (925) 606-5950, Fax: (925) 940-9556
www.baylinear.com

Adjustable (0.40Volt Dropout) B1117 Description Linear

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