RT9624F datasheet(3/13 Pages) RICHTEK

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RT9624F

DS9624F-02

July 2015

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Operation

POR (Power On Reset)

The POR block detects the voltage the VCC pin. When

the VCC pin voltage is higher than POR rising threshold,

the POR block output is high. The POR output is low

when VCC is not less than POR rising threshold. When

the POR block output is high, UGATE and LGATE can be

controlled by PWM input voltage. If the POR block output

is low, both UGATE and LGATE will be pulled to low.

Tri-State Detect

When both POR block output and EN pin voltages are

high, UGATE and LGATE can be controlled by PWM input.

There are three PWM input modes, which are high, low,

and shutdown state. If PWM input is within the shutdown

window, both UGATE and LGATE output are low. When

PWM input is higher than its rising threshold, UGATE is

high and LGATE is low. When PWM input is lower than

its falling threshold, UGATE is low and LGATE is high.

Bootstrap Control

The Bootstrap control block controls the integrated

bootstrap switch. When LGATE is high (low-side MOSFET

is turned on), the bootstrap switch is turned on to charge

the bootstrap capacitor connected to BOOT pin. When

LGATE is low (low-side MOSFET is turned off), the

bootstrap switch is turned off to disconnect VCC pin and

BOOT pin.

Turn-Off Detection

The turn-off detection block detects whether high-side

MOSFET is turned off by monitoring the PHASE pin

voltage. To avoid shoot through between high-side and

low-side MOSFETs, low-side MOSFET can be turned on

only after high-side MOSFET is effectively turned off.

Shoot-Through Protection

The shoot-through protection block implements the dead

time when both high-side and low-side MOSFETs are

turned off. With shoot-through protection block, high-side

and low-side MOSFET are never turned on simultaneously.

Thus, shoot through between high-side and low-side

MOSFETs is prevented.

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