Copyright

© ANPEC Electronics Corp.

Rev. A.2 - Aug., 2008

APL5910

www.anpec.com.tw

4

Electrical Characteristics (Cont.)

Pin Description

PIN

NO.

NAME

FUNCTION

1

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.

2

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

µA typical) pulls the EN voltage and

enables the regulator.

3

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

4

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.

5

NC

No Connection.

6

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 1A (max.) load current to loads.

During shutdown, the output voltage is quickly discharged by an internal pull-low MOSFET.

7

FB

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

voltage of the regulator.

Refer to the typical application circuits. These specifications apply over V

otherwise specified. Typical values are at T

APL5910

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

PROTECTIONS

1.7

2.1

2.5

Current-Limit Level

1.4

-

-

Short Current-Limit Level

-

0.4

-

A

Short Current-Limit Blanking

Time

From beginning of soft-start

0.6

1.6

-

ms

-

170

-

Thermal Shutdown Hysteresis

-

50

-

ENABLE AND SOFT-START

0.5

0.8

1.1

V

EN Hysteresis

-

80

-

mV

EN Pull-High Current

EN=GND

-

5

-

µA

Soft-Start Interval

0.3

0.6

1

ms

POWER-OK AND DELAY

Rising POK Threshold Voltage

90

92

94

%

POK Threshold Hysteresis

-

8

-

%

POK Pull-Low Voltage

POK sinks 5mA

-

0.25

0.4

V

POK Debounce Interval

-

10

-

µs

POK Delay Time

1

2

4

ms