AP139-20WL-7 Diodes Inc, AP139-20WL-7 Datasheet - Page 5

• Manufacturer Part Number: AP139-20WL-7
• Description: Low Dropout (LDO) Regulators LDO CMOS 300MA 0.5V VOUT+0.5V-7.0V 2.0V
• Manufacturer: Diodes Inc

Specifications of AP139-20WL-7

• Number Of Outputs: 1
• Polarity: Positive
• Input Voltage Max: 5.5 V
• Output Voltage: 2 V
• Output Type: Fixed
• Output Current: 300 mA
• Line Regulation: 0.3 %
• Load Regulation: 1 %
• Voltage Regulation Accuracy: 2 %
• Maximum Power Dissipation: 0.25 W
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOT-25
• Minimum Operating Temperature: - 40 C
• Lead Free Status / Rohs Status: Details

Function Description
The AP139 of CMOS regulators contain a PMOS pass transistor,
voltage reference, error amplifier, over-current protection,
thermal shutdown.
The P-channel pass transistor receives data from the error
amplifier, over-current protection, and thermal protection circuits.
During normal operation, the error amplifier compares the output
voltage to a precision reference. The over-current and thermal
shutdown circuits become active when the junction temperature
exceeds 130
shutdown, the output voltage remains low. Normal operation is
restored when the junction temperature drops below 110
The AP139 switches from voltage mode to current mode when
the load exceeds the rated output current. This prevents
over-stress.
AP139 Rev. 2
Typical Performance Characteristics
4 0 0
3 5 0
3 0 0
2 5 0
2 0 0
1 5 0
1 0 0
1.0E+00
-10
-20
-30
-40
-50
-60
-70
-80
-90
0
5 0
0
3 .5
BP=0
o
C, or the current exceeds 300mA. During thermal
1.0E+01
Power Supply Rejection Ratio
4
V c c V s S h o r t C u r r e n t
1.0E+02 1.0E+03
Frequency (Hz)
4 .5
V c c ( V )
5
1.0E+04
T o p to b o tto m
V o u t= 1 .5 V
V o u t= 1 .8 V
V o u t= 2 .5 V
V o u t= 3 .3 V
1.0E+05
5 .5
www.diodes.com
o
C.
100mA
10mA
1mA
1.0E+06
5 of 7
6
Enable
The enable pin normally floats high. When actively, pulled low,
the PMOS pass transistor shuts off, and all internal circuits are
powered down. In this state, the quiescent current is less than
2µA. This pin behaves much like an electronic switch.
External Capacitor
The AP139 is stable with a low ESR output capacitor to ground of
1.0µF or greater. It can keep stable even with higher ESR
capacitors. A second capacitor is recommended between the
input and ground to stabilize V
larger than 0.1µF to have a beneficial effect. All capacitors should
be placed in close proximity to the pins. A “quiet” ground
termination is desirable.
(Continued)
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1.5
300mA LOW-NOISE CMOS LDO
1.8
Vout Vs Current Limit
2
2.5
Vout (V)
IN
. The input capacitor should be
2.8
©
3
Diodes Incorporated
AP139
MARCH 2007
3.3
Vcc=5V
3.5