MP9218–HIGH PERFORMANCE REGULATED CHARGE PUMP

MP9218 Rev. 1.0

www.MonolithicPower.com

7

10/20/2014

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OPERATION

OUT

GND

IN

CP

CN

EN

Figure 1— Functional Block Diagram

The MP9218 uses a switched capacitor charge

pump to boost an input voltage to a regulated

output voltage. Regulation is achieved by

sensing the charge pump output voltage

through an internal resistor divider network. A

switched doubling circuit is enabled when the

divided output drops below a preset trip point

controlled by an internal comparator.

The switching signal, which drives the charge

pump, is created by an integrated oscillator

within the control circuit block. The fixed charge

pump switching frequency is approximately

1.35MHz.

The MP9218 has complete output short-circuit

and thermal protection to safeguard the device

under extreme operating conditions. An internal

thermal

protection

circuit

senses

die

temperature and will shut down the device if the

internal

junction

temperature

exceeds

approximately 145°C. The charge pump will

remain disabled until the fault condition is

relieved.