Copyright

© ANPEC Electronics Corp.

Rev. A.4 - Sep., 2009

APL5930

www.anpec.com.tw

8

Operating Waveforms (Cont.)

Refer to the typical application circuit. The test condition is V

unless otherwise specified.

CH1: V

CH2: V

TIME: 2

µs/Div

C

Shutdown

I

OUT

V

EN

1

4

2

3

V

OUT

V

POK

CH3: V

CH4: I

CH1: V

CH2: V

TIME: 0.5ms/Div

C

Enable

1

4

2

3

I

OUT

V

EN

V

OUT

V

POK

CH3: V

CH4: I

Pin Description

PIN

NO.

NAME

FUNCTION

1

GND

Ground pin of the circuitry. All voltage levels are measured with respect to this pin.

2

FB

Voltage Feedback Pin. Connecting this pin to an external resistor divider receives the feedback voltage

of the regulator.

3，4

VOUT

Output pin of the regulator. Connecting this pin to load and output capacitors (10

µF at least) is required

for stability and improving transient response. The output voltage is programmed by the resistor-divider

connected to FB pin. The VOUT can provide 3A (max.) load current to loads. During shutdown, the

output voltage is quickly discharged by an internal pull-low MOSFET.

5

VIN

Main supply input pin for voltage conversions. A decoupling capacitor (

≥10µF recommended) is usually

connected near this pin to filter the voltage noise and improve transient response. The voltage on this

pin is monitored for Power-On-Reset purpose.

6

VCNTL

Bias voltage input pin for internal control circuitry. Connect this pin to a voltage source (+5V

recommended). A decoupling capacitor (1

µF typical) is usually connected near this pin to filter the

voltage noise. The voltage at this pin is monitored for Power-On-Reset purpose.

7

POK

Power-OK signal output pin. This pin is an open-drain output used to indicate the status of output

voltage by sensing FB voltage. This pin is pulled low when output voltage is not within the Power-OK

voltage window.

8

EN

Active-high enable control pin. Applying and holding the voltage on this pin below the enable voltage

threshold shuts down the output. When re-enabled, the IC undergoes a new soft-start process. When

leave this pin open, an internal pull-up current (5

µA typical) pulls the EN voltage and enables the

regulator.

Exposed

Pad

-

Connect this pad to system VIN plane for good thermal conductivity.