SA1117B

800 mA LDO VOLTAGE REGULATOR

DESCRIPTION

The SA1117B is a positive low voltage dropout regulator; voltage

dropout is only 1.2V at 800mA.
SA1117B provides two versions: fixed and adjustable versions.
VOUT has a tolerance of less than 1.5% for fixed versions 1.5V,
SOT-223-3L
1.8V, 2.5V, 3.3V, 5.0V and adjustable version or 2% output
accuracy for fixed version 1.2V.
The SA1117B offers some key features include thermal shutdown
and current limiting. It is suitable for all electronic products.

FEATURES TO-252-2L

* 1.5% output accuracy for fixed versions 1.5V, 1.8V, 2.5V,

3.3V, 5.0V and adjustable version
* 2% output accuracy for fixed version 1.2V APPLICATIONS
* Low Dropout Voltage: 1.2V at 800mA output current
* Laptop, Palmtop, and Notebook
* Current Limiting
Computers
* Thermal Shutdown
* Battery Charger
* Temperature Range: -40°C to 125°C
* SCSI-II Active Terminator
* Cellular Phone
* Cordless Telephones
* Battery Powered Systems
* Portable Instrumentation
* SMPS Post-Regulator

ORDERING INFORMATION (Temperature range: -40°C ~125°C)

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 SA1117B

Part No. Package Marking Material Packing Type

SA1117BH-ADJTR SA1117BH-ADJ Pb free Tape & Reel
SA1117BH-1.2TR SA1117BH-1.2 Pb free Tape & Reel
SA1117BH-1.5TR SA1117BH-1.5 Pb free Tape & Reel
SA1117BH-1.8TR SOT-223-3L SA1117BH-1.8 Pb free Tape & Reel
SA1117BH-2.5TR SA1117BH-2.5 Pb free Tape & Reel
SA1117BH-3.3TR SA1117BH-3.3 Pb free Tape & Reel
SA1117BH-5.0TR SA1117BH-5.0 Pb free Tape & Reel
SA1117BD-ADJ SA1117BD-ADJ Pb free Tube
SA1117BD-ADJTR SA1117BD-ADJ Pb free Tape & Reel
SA1117BD-1.2 SA1117BD-1.2 Pb free Tube
SA1117BD-1.2 TR SA1117BD-1.2 Pb free Tape & Reel
SA1117BD-1.5 SA1117BD-1.5 Pb free Tube
SA1117BD-1.5TR SA1117BD-1.5 Pb free Tape & Reel
SA1117BD-1.8 SA1117BD-1.8 Pb free Tube
TO-252-2L
SA1117BD-1.8TR SA1117BD-1.8 Pb free Tape & Reel
SA1117BD-2.5 SA1117BD-2.5 Pb free Tube
SA1117BD-2.5TR SA1117BD-2.5 Pb free Tape & Reel
SA1117BD-3.3 SA1117BD-3.3 Pb free Tube
SA1117BD-3.3TR SA1117BD-3.3 Pb free Tape & Reel
SA1117BD-5.0 SA1117BD-5.0 Pb free Tube
SA1117BD-5.0TR SA1117BD-5.0 Pb free Tape & Reel

BLOCK DIAGRAM

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 SA1117B

ABOSOLUTE MAXIMUM RATINGS

Characteristics Symbol Ratings Unit

Input Supply Voltage VIN 20 V
Lead Temperature (Soldering, 5 seconds) TLead 260 °C
Operating Junction Temperature Range TJ 150 °C
Storage Temperature Range Tstg -65 ~ +150 V
Power Dissipation PD Internally Limited (Note1) mW
ESD Tolerance (Minimum) ESD 2000 V

Note1: The maximum allowable power dissipation is a function of maximum operating junction temperature, TJ
(max), the junction to ambient thermal resistance, θJA, and the ambient temperature Tamb. The maximum
allowable power dissipation at any ambient temperature is given: PD (max) = (TJ (max) - Tamb)/θJA, exceeding the
maximum allowable power limit will result in excessive die temperature; thus, the regulator will go into thermal
shutdown. The junction to ambient thermal resistance, θJA of some packages may be different, The value of θJA
depends on mounting technique.

RECOMMENDED OPERATING CONDITIONS

Characteristics Symbol Ratings Unit

Input voltage VIN 15 V
Operating Junction Temperature Range TJ -40 ~ +125 °C

ELECTRICAL CHARACTERISTICS(Tamb=25°C, unless otherwise specified. Limits appearing in Boldface

type apply over the entire junction temperature range for operation, -40°C to 125°C. )

Characteristics Symbol Conditions Min. Typ. Max. Unit

SA1117B-ADJ,
Reference Voltage VREF IOUT=10mA, VIN-VOUT=2V, TJ=25°C 1.231 1.250 1.268 V
10mA≤IOUT≤1A, 1.4V≤VIN-VOUT≤10V 1.225 1.250 1.275
SA1117B-1.2,
IOUT=10mΑ, VIN=3.2V ,TJ=25°C 1.176 1.2 1.224 V
10mA≤IOUT≤1A, 3.0V≤VIN≤10V 1.152 1.2 1.248
SA1117B-1.5,
IOUT=10mΑ, VIN=3.5V ,TJ=25°C 1.477 1.500 1.522 V
10mA≤IOUT≤1A, 3.0V≤VIN≤10V 1.470 1.500 1.530
SA1117B-1.8,
Output Voltage VOUT IOUT=10mA, VIN=3.8V, TJ=25°C , 1.773 1.800 1.827 V
0≤IOUT≤1A, 3.2V≤VIN≤10V 1.746 1.800 1.854
SA1117B -2.5,
IOUT=10mA, VIN=4.5V,TJ=25°C , 2.462 2.500 2.538 V
0≤IOUT≤1A, 3.9V≤VIN ≤10V 2.450 2.500 2.550
SA1117B-3.3,
IOUT=10mA, VIN=5V,TJ=25°C , 3.250 3.300 3.349 V
0≤IOUT≤1A, 4.75V≤VIN≤10V 3.235 3.300 3.365

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 SA1117B

Characteristics Symbol Conditions Min. Typ. Max. Unit

SA1117B-5.0,
Output Voltage VOUT IOUT=10mA, VIN=7V, TJ=25°C , 4.925 5.000 5.075 V
0≤ IOUT≤1A, 6.5V≤VIN≤12V 4.900 5.000 5.10
Output Voltage
TSOUT 0.3 %
Temperature Stability
VINMIN ≤VIN≤ 12V,VOUT=Fixed/Adj,
Line Regulation Rline 3 7 mV
IOUT=10mA
Load Regulation Rload 10mA≤IOUT≤ 800mA,VOUT=Fixed/Adj 6 12 mV
IOUT=100mA 1.00 1.20
Dropout Voltage Vdrop IOUT=500mA 1.05 1.25 V
IOUT=800mA 1.20 1.30
Quiescent Current Iq 4.25V≤VIN≤ 6.5V 5 10 mA
fRIPPLE=120Hz, (VIN-VOUT)=3V,
Ripple Rejection PSRR 60 75 dB
VRIPPLE=1VPP
Adjust pin Current Iadj 60 120 µA
Adjust pin Current
0≤ IOUT≤800mA,1.4V ≤VIN-VOUT≤10V 0.2 5 µA
Change
Thermal shutdown TSD 150 °C
Current limitting Ilimit 0.9 1.1 1.2 A
Temperature Stabiliy 0.5 %
Long Term Stability TAMB=125°C, 1000Hrs 0. 3 %
RMS Output Noise % of VOUT, 10Hz≤f≤10kHz 0.003 %

PIN CONFIGURATION

PIN DESCRIPTION

Pin No. Pin name I/O Functions

1 GND/ADJ --/O Ground/ADJ
2 VOUT O Output voltage
3 VIN I Input supply voltage

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 SA1117B

FUNCTION DESCRIPTION

The SA1117B is a LDO regulator, it’

s pass transistor is made up of a single NPN transistor being driven by a
PNP. The dropout voltage is defined as: VDROP = VBE+ VSAT.
The SA1117B series of fixed and adjustable regulators are easy to use. Output voltages are 1.2V, 1.5V, 1.8V,
2.5V, 3.3V, and 5.0V.On-chip thermal shut down provides protection against any combination of overload and
ambient temperature that would create excessive junction temperature.
The SA1117B requires an output capacitor for device stability. Its value of 22µF tantalum covers all cases of
bypassing the adjustment terminal. Without bypassing the adjustment terminal smaller capacitors can be used
with equally good results which depend upon the application circuit. In general, linear regulator stability
decreases with higher output currents.

TYPICAL APPLICATION CIRCUIT

Figure 1. Typical Fixed Output Voltage

Figure 2. Typical Adjustable Output Voltage

Note: The circuit and parameters are reference only, please set the parameters of the real application circuit based
on the real test.

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 SA1117B

TYPICAL CHARACTERISTICS CURVES

Temperature Stability Adjust Pin Current

100
90

Adjust pin current ( A)

80
70
60
50
40
30
20
10
0
-50 -25 0 25 50 75 100 125 150
Temperature( C)

VOUT=5 V Load Transient Response VOUT=5 V Line Transient Response

Output voltage

Input voltage
deviation(V)

deviation(V)
Output Voltage
deviation (mV)
current (A)
Load

Ripple Rejection VS Current

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 SA1117B

PACKAGE OUTLINE

TO-252-2L Unit: mm

TO-252-2L Unit: mm

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 SA1117B

PACKAGE OUTLINE

SOT-223-3L Unit: mm

Disclaimer:
• Silan reserves the right to make changes to the information herein for the improvement of the design and performance
without further notice!
• All semiconductor products malfunction or fail with some probability under special conditions. When using Silan products
in system design or complete machine manufacturing, it is the responsibility of the buyer to comply with the safety
standards strictly and take essential measures to avoid situations in which a malfunction or failure of such Silan products
could cause loss of body injury or damage to property.
• Silan will supply the best possible product for customers!

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