AP7173_09 Datasheet, PDF (4/16 Pages) Diodes Incorporated – 1.5A LOW DROPOUT LINEAR REGULATOR WITH

Pin Descriptions
AP7173
1.5A LOW DROPOUT LINEAR REGULATOR WITH
PROGRAMMABLE SOFT-START
Pin
Name
IN
PG
VCC
EN
GND
SS
FB
OUT
Thermal Pad
PIN #
SOP-8L-EP DFN3030-10
Description
1
1, 2
Power Input pin.
Power-Good pin, open-drain output. When the VOUT is below the
PG threshold the PG pin is driven low; when the VOUT exceeds the
2
3
threshold, the PG pin goes into a high-impedance state. To use the
PG pin, use a 10kΩ to 1MΩ pull-up resistor to pull it up to a supply of
up to 5.5V, which can be higher than the input voltage.
3
4
Bias Input pin, provides input voltage for internal control circuitry.
This voltage should be higher than the VIN.
Enable pin. This pin should be driven either high or low and must not
4
5
be floating. Driving this pin high enables the regulator, while pulling it
low puts the regulator into shutdown mode.
5
6
Ground.
Soft-Start pin. Connect a capacitor between this pin and the ground
6
7
to set the soft-start ramp time of the output voltage. If no capacitor is
connected, the soft-start time is typically 100µS.
7
8
Feedback pin. Connect this pin to an external voltage divider to set
the output voltage.
8
9, 10
Regulated Output pin.
—
—
Solder this pad to large ground plane for increased thermal
performance.
Block Diagram
IN
EN
VCC
PG
Gate
Driver
Current Limit and
Thermal Shutdown
+ 0.8V
-
-
+ ^0.72V
OUT
SS
FB
GND
AP7173 Rev. 7
DS31369
4 of 16
www.diodes.com
OCTOBER 2009
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