RT8072GSP 데이터 시트보기 (PDF) - Richtek Technology

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RT8072GSP

5A, 2MHz, High Efficiency Synchronous Step-Down Converter

Richtek Technology 

RT8072

Operation

The RT8072 is a current mode synchronous step-down

DC/DC converter with two integrated power MOSFETs. It

can deliver up to 5A output current from a 2.9V to 5.5V

input supply. The RT8072's current mode architecture

allows the transient response to be optimized over a wide

input voltage and load range. Cycle-by-cycle current limit

provides protection against shorted outputs and soft-start

eliminates input current surge during start-up.

Error Amplifier

The error amplifier adjusts COMP voltage by comparing

the feedback signal (VFB) from the output voltage with the

internal 0.8V reference. When the load current increases,

it causes a drop in the feedback voltage relative to the

reference. The COMP voltage then rises to allow higher

inductor current to match the load current.

Oscillator (OSC)

The internal oscillator provides switching frequency from

300kHz to 2MHz, and is adjusted by an external resistor.

PGOOD Comparator

When the feedback voltage (VFB) rises above 94% or falls

below 106% of reference voltage, the PGOOD open drain

output will be high impedance. The PGOOD open drain

output will be internally pulled low when the feedback

voltage (VFB) falls below 90% or rises above 110% of

reference voltage.

Soft-Start (SS)

An internal current source charges an external capacitor

to build the soft-start ramp voltage (VSS). The VFB voltage

will track the VSS during soft-start interval. The chip will

use internal soft-start if the SS pin is floating. The nominal

internal soft-start time is 800μs.

Over Temperature Protection (OTP)

The RT8072 implements an internal over temperature

protection. When junction temperature is higher than

165°C, it will stop switching operation. Once the junction

temperature decreases below 145°C, the RT8072 will

automatically resume switching.

Copyright ©2012 Richtek Technology Corporation. All rights reserved.

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is a registered trademark of Richtek Technology Corporation.

DS8072-01 November 2012

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