MP2040 –FAST TRANSIENT RESPONSE, 3A VERY LOW DROPOUT LINEAR REGULATOR

MP2040 Rev.1.0

www.MonolithicPower.com

10

9/21/2010

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APPLICATION INFORMATION

PG

The power good pin is an open drain output a

pull up resistor (100kΩ recommended). The pull

up resistor can be tied to a supply within the

voltage range of the pin (0 to 5.5V). For example,

the pull up resistor can be tied to the input

voltage that is monitored by an IC powered from

this input voltage. If the output voltage is 10%

below its regulation point, the PG pin becomes

low.

Bypass Capacitors

For lower noise, the reference voltage can be

bypassed by an external capacitor. A low ESR

capacitor, such as the ceramic type, will provide

the best performance.

It also can function as an external soft start, the

soft start time;

Performance Transient Response

For a 3A transient response, suggests increasing

the input capacitance should be increased to

22µF or higher to get better performance. This

will also avoid glitches on the PG pin due to

excessive undershoot. Also increase the input

transient response.

Maximum Output Voltage and Load Current

output current will be decreased to 2.5A. The

Bias Input Voltage

The bias input is designed for low drop

application. The bias pin must be at least 3.3V,

and at least 2.5V higher than the output voltage.

If

the

supply

voltage

meets

these