APL1565A(2008) View Datasheet(PDF) - Anpec Electronics

Part Name

Description

Manufacturer

APL1565A
(Rev.:2008)

1A Low Dropout, Fast Response Fixed Voltage Regulator

Anpec Electronics 

APL1565A

Typical Characteristics (Cont.)

Output Voltage vs. Junction Temperature

3.35

AP1565A-33

3.33

3.31

3.29

3.27

3.25

-40

0

40

80

120

Junction Temperature (°C )

Application Information

Capacitor Selection and Regulator Stability

The APL1565A uses at least a 4.7µF capacitor on the

input. This capacitor can use Aluminum, Tantalum or Ce-

ramic capacitors. Input capacitor with large values and

low ESR provides better PSRR and line-transient

response. The output capacitor also can use Aluminum,

Tantalum or Ceramic capacitors, and a minimum value

of 10µF and ESR above 0.06W is recommended. A larger

output capacitor can reduce noise and improve load-tran-

sient response, stability and PSRR.

channel MOSFET pass transistor, the dropout voltage is

a function of drain-to-source on-resistance (RDS(ON)) mul-

tiplied by the load current.

Reverse Current Protection

The APL1565A has an internal reverse protection, and it

does not need an external schottky diode to connect the

regulator input and output. If the output voltage is forced

above the input voltage by more than 11mV, the IC will be

shutdown and the ground pin current is below 0.1µA.

Load-Transient Considerations

The APL1565A load-transient response graphs in typical

characteristics show the transient response. A step

change in the load current from 0mA to 1A at 1µs will

cause a 100mV transient spike. Larger output capacitor

and lower ESR can reduce transient spike.

Input-Output (Dropout) Voltage

The minimum input-output voltage difference (dropout)

determines the lowest usable supply voltage. In bat-

tery-powered systems, this will determine the useful end-

of-life battery voltage. Because the APL1565A uses a p-

Current Limit

The APL1565A has a current limit protection. The ouptut

voltage will drop close to zero volt when load current

reaches the limit, and then the load current will be limited

at 150mA after output voltage is below 0.7V. When the

load current back to the value where limiting started, the

output voltage and current will return to normal value.

When output is shorted to ground, the APL1565A will keep

short circuit current at 150mA .

Copyright © ANPEC Electronics Corp.

8

Rev. A.5 - Mar., 2008

www.anpec.com.tw

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