DESCRIPTION 300mA ULTRA LOW DROPOUT
Technology Licensed from International Rectifier
APU8831
300mA ULTRA LOW DROPOUT REGULATORS
DESCRIPTION
FEATURES
5-PIN SOT-23 Package
Stable with 2.2mF Ceramic Capacitor
2% Voltage Reference Accuracy
Only 270mV Dropout at 300mA
and 170mV Dropout at 150mA
5mA Quiescent Current in Shutdown
Current Limit and Thermal Shutdown
Logic Input Enable Pin
RoHS Compliant
The APU8831 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 APU8831 is available in fixed and adjustable output
voltage versions in a small SOT-23 5-Pin package.
APPLICATIONS
Laptop, Notebook & Palmtop computers
Battery Powered Equipments
PCMCIA Vcc & Vpp Regulator
Consumer Electronics
High Efficiency Linear Power Supplies
TYPICAL APPLICATION
VIN
3
VIN
VOUT
4
C1
2.2uF
VOUT
R1
2
C2
2.2uF
Gnd
(
Vo = 1.253 1+
R1
R2
)
R2
SD
Enable
1
En
Adj
5
Figure 1 - Typical application of the APU8831 ajustable voltage regulator.
PACKAGE ORDER INFORMATION
TJ (°C)
0 To 125
5-PIN
SOT-23
APU8831Y5
Data and specifications subject to change without notice.
OUTPUT
VOLTAGE
Adj
1
200712251
APU8831
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)
VIN Gnd En
3
2
1
4
5
VOUT
Adj
uJA=2568C/W
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over CIN=Co=22mF, Io=100mA, VIN(MIN)=2.5V(Adjustable
devices) VIN=Vo + 1V(for fixed voltage devices), VOUT=VFB(for adjustable version only), CBYP=470pF(for fixed voltage devices),
VENB=2V and TA=258C. Typical values refer to TA=258C. Low duty cycle pulse testing is used which keeps junction and
case temperatures equal to the ambient temperature.
PARAMETER
Reference Voltage
(See Table 1 for typical values)
Line Regulation
Load Regulation (Note 1)
SYM
Vo
TEST CONDITION
DVI
DVL
Dropout Voltage (Note 2)
DVI(O)
Ground Current (Note 3)
IQ
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)=2V to VIN
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
MIN
TYP
-2
IQ(SD)
ICL
DVP
IADJ
VEN(L)
VEN(H)
320
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
MAX UNITS
%
2
%/V
%
50
70
110
140
220
260
350
400
160
0.01
20
mA
600
2900
9500
0.8
2
mV
mA
mA
%/W
mA
V
V
mA
mA
2
APU8831
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.
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.
PIN DESCRIPTIONS
PIN #
PIN SYMBOL
3
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.
2
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.
1
En
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.
5
Adj
A resistor divider from this pin to the VOUT pin and ground sets the output voltage. To
minimize the error due to the error amplifier, select the values of the resistor dividers
to be less than 10KV.
4
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.
5-PIN
SOT-23
APU8831
Output
Voltage
1.25V
Table 1- Nominal output voltage vs. part number.
The output voltage of the adjustable device can be set
using:
(
Vo = 1.253 1+
R1
R2
)
Where:
R1 = Resistor connected from output to the Adj pin
R2 = Resistor connected from Adj pin to Gnd
3
APU8831
BLOCK DIAGRAM
4 VOUT
VIN 3
Adj 5
THERMAL
SHUTDOWN
1.25V
+
1 En
Gnd 2
Figure 2 - APU8831 Adjustable output block diagram.
4
ADVANCED POWER ELECTRONICS CORP.
Package Outline : SOT-23-5L
Millimeters
SYMBOLS
MIN
NOM
MAX
A
1.00
1.10
1.30
A1
0.00
---
0.10
A2
0.70
0.80
0.90
b
0.35
0.40
0.50
C
0.10
0.15
0.25
D
2.70
2.90
3.10
E
1.50
1.60
1.80
e
---
1.90(TYP)
---
H
2.60
2.80
3.00
L
0.37
---
---
θ1
1°
5°
9°
e2
---
0.95(TYP)
---
Note 1:Package Body Sizes Exclude Mold Flash Protrusions or Gate Burrs.
Note 2:Tolerance ± 0.1000 mm(4mil) Unless Otherwise Spe- cified.
Note 3:Coplanarity:0.1000 mm
Note 4:Dimension L Is Measured in Gage plane.
Part Marking Information & Packing : SOT-23 -5L
Part Number : RG
RGXX
Date Code : XX
5
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