AP7201-1818FMG-7 datasheet(10/13 Pages) DIODES

10 / 13 page

AP7201

DUAL 150mA LOW DROPOUT LINEAR REGULATOR

AP7201 Rev. 3

10 of 13

MAY 2014

www.diodes.com

DISCONTINUED

Application Note

Input Capacitor

AP7201 requires a minimum input capacitance of

0.22

μF ceramic capacitor between VIN and GND pins to

prevent any impedance interactions with the supply.

This input capacitor should be located as close as

possible to the device to assure input stability and less

noise. For PCB layout, a wide copper trace is required

for both IN and GND.

Output Capacitor

AP7201 requires a minimum of 0.22

μF capacitance on

each output to stabilize the transient response of the

LDO. The AP7201 is designed to have excellent

transient response for most applications with a small

amount of output capacitance. A ceramic capacitor is

recommended on each channel to connect between

OUT and GND pins. The device is also stable with

multiple capacitors in parallel, which can be of any type

of value. Larger capacitance helps to reduce undershoot

and overshoot during transient and provides better

stability and noise performance. This output capacitor

should be placed as close as possible to OUT and GND

pins for optimum performance.

No Load Stability

Other than external resistor divider, no minimum load is

required to keep the device stable. The device will

remain stable and regulated in no load condition.

ENABLE/SHUTDOWN Operation

The AP7201 is turned on by setting the EN pin high by

pulling to input voltage (VIN), and is turned off by pulling

it low (GND). The EN function allows the output of each

regulator to be turned off independently, resulting in

greatly reduced power consumption.

The EN pin

should be tied to VIN pin to keep the regulator output on

at all time. To ensure proper operation, the signal

source used to drive the EN pin must be able to swing

above and below the specified turn-on/off voltage

thresholds listed in the Electrical Characteristics section

under VIL and VIH.

Current Limit Protection

In the presence of a short or excessive load current

condition, the AP7201 uses an internal short circuit

fold-back mechanism that triggers the current limit

protection

and

clamps

the

output

current

approximately 300mA.

Short Circuit Protection

When OUT pin is short-circuited to GND or OUT pin

voltage is less than 200mV, short circuit protection will

be triggered and clamp the output current to

approximately 40mA typical. This feature protects the

regulator from over-current and damage due to

overheating.

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