Copyright ANPEC Electronics Corp.
Rev. A.9 - Dec., 2008
APL1087
www.anpec.com.tw1
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise
customers to obtain the latest version of relevant information to verify before placing orders.
800mA Low Dropout Fast Response Positive Adjustable Regulator and Fixed
1.8V, 2.5V, and 3.3V
• Guaranteed Output Voltage Accuracy within 2%
• Fast Transient Response
• Guaranteed Dropout Voltage at Multiple Currents
• Load Regulation : 0.6% Typ.
• Line Regulation : 0.03% Typ.
• Low Dropout Voltage : 1.3V Typ. at IOUT =500mA
• Current-Limit : 0.8A Min. at TJ=125°C
• On-Chip Thermal Limiting : 150 °C Typ.
• Adjustable Output : 1.25~7.15V
• Standard 3-Pin SOT-89, SOT-223, TO-92, and
TO- 252 Power Packages.
• Lead Free and Green Devices Available
(RoHS Compliant)
FeaturesGeneral Description
The APL1087 is a low dropout three-terminal adjustable
regulators with 0.8A output current capability. In order to
obtain lower dropout voltage and faster transient
response, which is critical for low voltage applications,
the APL1087 has been optimized.
The device is available in an adjustable version and fixed
output voltages of 1.8V, 2.5V, and 3.3V, the output avail-
able voltage range is from 1.25 to 7.15V with an input
supply below 9V. Dropout voltage is guaranteed at a maxi-
mum of 1.45V at 0.5A.
Current limit is trimmed to ensure specified output cur-
rent and controlled short-circuit current. On-chip thermal
limiting provides protection against any combination of
overload that would create excessive junction
temperatures.
The APL1087 is available in the industry standard 3-pin
SOT-89, SOT-223, TO-92, and TO-252 power packages.
Applications
• Voltage Regulator for CD-ROM Drivers
• Voltage Regulator for LAN Cards
• Voltage Regulator for Mother Boards
• Wireless Communication Systems
• Portable Instrument
• Portable Consumer Equipment
• Low Voltage Systems
Simplified Application Circuits
* Needed if device is far from filter capacitors
1.25V to 7.15V Adjustable Regulator
Improving Ripple Rejection
R1
R2R1
1.250VVOUT +
×=
5V Regulator with Shutdown
* C3 improves ripple rejection.
XC should be approximately
equal to R1 at ripple frequency
VIN VOUT
+
R1
R2
APL1087
OUTIN ADJ
+
121Ω
**
10µF
C1
100µF
C2
VIN
APL1087
OUTIN ADJ
TTL
121Ω
365Ω
1%
1%
+
1k
1k
5V
+
10µF100µF
VIN
APL1087
OUTIN ADJ VOUT
150µF
C
R1
R2 +
+
*
3
10µF
10µF