APU8812(300mA)
Advanced Power
Electronics Corp.
Technology Licensed from International Rectifier
APU8812
Preliminary
1.2V/300mA ULTRA LOW DROPOUT
FIXED REGULATORS
DESCRIPTION
FEATURES
5-Pin SOT-23 Package
Stable with 2.2mF Ceramic Capacitor
2% Voltage Reference Accuracy
Only 270mV Dropout at 300mA
5mA Quiescent Current in Shutdown
Current Limit and Thermal Shutdown
Logic Input Enable Pin
RoHS Compliant
The APU8812 device is an efficient linear voltage regulator with better than 2% initial voltage accuracy, very low
dropout voltage and very low ground current designed
especially for hand held, battery powered applications.
Other features of the device are: TTL compatible enable/
shutdown control input, current limiting and thermal shutdown.
The APU8812 is available in fixed output voltage versions
in a small 5-Pin SOT-23 package.
APPLICATIONS
Laptop, Notebook & Palmtop computers
Battery Powered Equipments
PCMCIA Vcc & Vpp Regulator
Consumer Electronics
High Efficiency Linear Power Supplies
TYPICAL APPLICATION
>=1.5V
1
VIN
2
Gnd
3
En
VOUT
5
1.2V
C1
2.2uF
SD
Enable
C2
2.2uF
Vsense
4
Figure 1 - Typical application of the APU8812 fixed voltage regulator.
PACKAGE ORDER INFORMATION
TJ (°C)
0 To 125
5-PIN
SOT-23
APU8812Y5
Data and specifications subject to change without notice.
OUTPUT
VOLTAGE
1.2V
201011062-1/4
Advanced Power
Electronics Corp.
APU8812
ABSOLUTE MAXIMUM RATINGS
Input Voltage (V IN) .....................................................
Enable Input Voltage .................................................
Storage Temperature Range .......................................
Operating Junction Temperature Range ......................
10V
10V
-65°C To 150°C
0°C To 150°C
PACKAGE INFORMATION
5-PIN SOT-23 (Y5)
En Gnd VIN
3
2
1
Fixed
4
5
Vsense
VOUT
uJA=2568C/W
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over CIN=Co=2.2mF, Io=100mA,VIN=1.8V, CBYP=470pF,
VENB=1.8V and TA=25줛. Typical values refer to TA=25줛. Low duty cycle pulse testing is used which keeps junction
andcase temperatures equal to the ambient temperature.
PARAMETER
Reference Voltage
SYM
Vo
Line Regulation
Load Regulation (Note 1)
DVI
DVL
Dropout Voltage (Note 2)
DVI(O)
Ground Current (Note 3)
IQ
Ground Current-SD Activated
Current Limit
Thermal Regulation
Adjust Pin Current
Enable Pin Input LO Voltage
Enable Pin Input HI Voltage
Enable Pin Input LO Current
Enable Pin Input HI Current
TEST CONDITION
IQ(SD)
ICL
DVP
IADJ
VEN(L)
VEN(H)
MIN
TYP
-2
Vo + 1V<VIN<10V
1mA<Io<100mA
100mA<Io<300mA
Io=100mA
Io=100mA (Note 4)
Io=50mA
Io=50mA (Note 4)
Io=150mA
Io=150mA (Note 4)
Io=300mA
Io=300mA (Note 4)
VEN =2V, Io=100mA
Io=100mA (Note 4)
Io=50mA
Io=50mA (Note 4)
Io=150mA
Io=150mA (Note 4)
Io=300mA
Io=300mA (Note 4)
VEN =0V to 0.8V or Open
Vo=0V
VIN=10V, Io=150mA, 10ms Pulse
VIN=2.5V, Vo=VADJ
Regulator OFF
Regulator ON
VEN(L) =0V to 0.8V
VEN(H)=1.2V to VIN
320
MAX UNITS
2
0.005
0.8
0.1
10
13
85
100
170
204
270
324
120
240
420
540
2200
2900
7200
9300
5
420
0.05
0.1
%/V
%
50
70
110
140
220
260
350
400
160
0.01
20
mV
mA
600
2900
9500
0.8
1.2
%
mA
mA
%/W
mA
V
V
mA
mA
2/4
Advanced Power
Electronics Corp.
Note 1: Low duty cycle pulse testing with Kelvin connections is required in order to maintain accurate data.
Note 2: Dropout voltage is defined as the minimum differential voltage between VIN and VOUT required to maintain regulation at VOUT. It is measured when the output
voltage drops 1% below its nominal value.
APU8812
Note 3: Ground current is the regulator quiescent current plus the pass transistor current. The total current
from the supply is the sum of the load current plus the
ground pin current.
Note 4: The specification applies for the junction temperature of 0 to +1258C.
PIN DESCRIPTIONS
PIN #
1
2
PIN SYMBOL
VIN
PIN DESCRIPTION
The input pin of the regulator. Typically a large storage capacitor is connected from
this pin to ground to insure that the input voltage does not sag below the minimum
drop out voltage during the load transient response. This pin must always be higher
than VOUT by at least the amount of the dropout voltage and some margin in order for
the device to regulate properly.
Gnd
Ground pin. This pin must be connected to the lowest potential in the system and all
other pins must be at higher potential with respect to this pin.
3
En
4
Vsense
5
VOUT
Enable pin. A low signal or left open on this pin shuts down the output. This pin must
be tied HI or to VIN for normal operation.
must be connected from this pin to VOUT
The output of the regulator. A minimum of 2.2mF with max ESR of 1V capacitor must
be connected from this pin to ground to insure stability.
3/4
Advanced Power
Electronics Corp.
APU8812
BLOCK DIAGRAM
VIN 1
5 VOUT
4 Vsense
THERMAL
SHUTDOWN
+
1.2V
Gnd 2
3 En
Figure 2 - APU8812 Fixed output 1.2V block diagram.
4/4
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