ETC1 B1117S-1.8 1.0amp low dropout voltage regulator Datasheet

Bay Linear
Inspire the Linear Power
B1117
1.0Amp Low Dropout Voltage Regulator
Adjustable & Fix (0.40Volt Dropout)
Description
Features
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•
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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.
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•
•
•
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.
Pin Connection
•
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
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•
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Active SCSI terminators
High efficiency Linear Regulator
Post regulators fro Switching Supplies
Battery Charger
5V to 3.3V linear Regulators
Motherboard Clock Supplies
Ordering Information
Devices
B1117D-X
B1117N-X
B1117T-X
B1117S-X
B1117M-X
SOT-223-5
SOT-223
Tab V OUT
8-Pin Surface Mount
ADJ
1
8
IN
NC
2
7
IN
OUT
3
6
IN
OUT
4
5
SOT -223
Tab V OUT
#1 Sense
#2 Adj/GND
#3 OUT
#4 Control
#5 VIN
N.C.
Top View
Adj/GND OUT IN
Front View
1
2
3
4
Front View
Package
Temp.
TO-252
TO-223
TO-220
TO-263
SO-8
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
TO-252
5
1
2
3
5
4
3
2
1
VPOWER
VCONTROL
OUTPUT
ADJ/GND.
SENSE
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
Min
Max
Unit
0
-65
7.0
125
150
300
V
°C
Maximum Input Voltage
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering 10 Sec.)
Electrical Characteristics
(VIN = 7V; TJ=25°C IO = 10mA to 1.0Amp, unless otherwise specified)
Parameter
Symbol
Conditions
Reference Voltage
VO
Line Regulation (1)
REG (line)
Load Regulation (1)
REG (LOAD)
Output Voltage
VO
Dropout Voltage
VD
Dropout Voltage
VD
Current Limit
IS
Minimum Load Current
Temperature Regulation
Long Term Stability
Temperature Stability
Adjust pin Current
Ripple Rejection
IMIN LOAD
TA
TS
RA
1117-adj, IOUT=10mA, VIN-VOUT=2V, TJ=25°C
1.5V≤(VIN-VOUT) ≤5.75V
10mA≤IOUT≤IFULL LOAD
MIN
TYP
MAX
UNIT
1.238
1.225
-2%
1.250
1.250
V
V
(VOUT+1.5)≤VIN≤7V, IOUT=10mA
0.005
1.262
1.275
+2%
0.2
(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
0.05
0.5
1.782
1.746
1.80
1.80
1.818
1.854
V
1117-2.5 IOUT=10mA, VIN=4.5V, TJ=25°C
0≤IOUT≤1.0Amp, 4.0V≤VIN≤7V
2.475
2.450
2.50
2.50
2.525
2.550
V
1117-2.85 IOUT=10mA, VIN=4.85V, TJ=25°C
0≤IOUT≤1.0Amp, 4.35V≤VIN≤7V
2.820
2.790
2.85
2.85
2.880
2.910
V
1117-3.3 IOUT=10mA, VIN=5.0V, TJ=25°C
0≤IOUT≤1.0Amp, 4.8V≤VIN≤7V
3.267
3.235
3.30
3.30
3.333
3.365
V
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
4.950
4.900
5.00
5.00
5.050
5.100
V
0.80
0.80
0.35
1.00
1.10
0.40
V
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)
1.0
1.1
60
Thermal Shutdown
Thermal Shutdown
Hysterics
V
A
10
0.004
0.03
0.5
35
75
%
0.02
1.0
120
mA
%/W
%
%
µA
dB
°C
°C
155
10
-
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 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 0.5Ω. The output capacitance could increase in
size to above the minimum value. The larger value of
output capacitance as high as 100µF 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
125°C.
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 65°C of the soldering temperature range.
2.85V
B1117-2.85
+
+
10uF
27KΩ ..
PO = (10V - 2.85)(105mA) = (7.15)(105mA) = 750mW
Fig. 1. Circuit Layout, Thermal Experiments.
THERMAL CHARACTERISTICS
The thermal resistance of B1117 is 15°C/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:
10uF
50 X 50 mm
35 X 17 mm
16 X 10 mm
Fig. 2. Substrate Layout for SOT-223
PD = (VIN - VOUT)(IOUT)
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
TOPDIDE COPPER AREA
BACKSIDE COPPER AREA
2500mm
2500mm
2500mm
2500mm
2500mm
1600mm
2500mm
2500mm
1600mm
900mm
900mm
2500mm
1250mm
950mm
2500mm
1800mm
600mm
1250mm
915mm
600mm
240mm
240mm
2500mm
2500mm
2500mm
0
0
1600mm
0
0
0
900mm
0
VIN
IN
BAY
B1117
VIN
OUT
IN
C1
C1
ADJ
THERMAL RESISTANCE
JUNCTION TO 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°
BAY
B1117
VOUT
OUT
C2
ADJ
R1
R1
LOAD
1.0Amp Current output
Bay Linear, Inc
R2
VOUT= VREF(1+R2/R1) +ADJ
Typical Adjustable Regulator
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
0.041
0.033
0.0905 NOM
0.181 NOM
0.146
0.130
0.0040
0.0008
0.264
0.248
16°C
10°C
16°C
10°C Max
0.033
0.025
0.014
0.010
16°C
10°C
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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