RT8120 查看數據表（PDF） - Richtek Technology

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RT8120

Single-Phase Synchronous Buck PWM Controller

Richtek Technology 

RT8120

Functional Pin Description

Pin No.

SOP-8

SOP-8

(Exposed Pad)

Pin Name

Pin Function

Bootstrap Power Pin. This pin powers the upper gate driver.

1

1

BOOT

Connect a bootstrap capacitor between the BOOT pin and

PHASE pin on the upper MOSFET.

Upper-Gate Driver Output. Connect to gate of the high side

2

2

UGATE

power N-MOSFET. This pin is monitored by the adaptive

shoot-through protection circuitry to determine when the upper

MOSFET has turned off.

3

3,

9 (Exposed Pad)

GND

Ground for the IC. All voltage levels are measured with respect to

this pin. Connect this pin directly to the low side MOSFET source

and ground plane with the lowest impedance. The exposed pad

must be soldered to a large PCB and connected to GND for

maximum power dissipation.

Lower-Gate Driver Output. Connect to the gate of the low side

power N-MOSFET. It provides the PWM-controlled gate drive

(from VCC). This pin is also monitored by the adaptive

shoot-through protection circuitry to determine when the lower

4

4

LGATE/OCSET MOSFET has turned off. During a short period of time following

Power-On Reset (POR) or shutdown release, this pin is also used

to determine the over-current threshold of the converter

(LGOCS). Connect a resistor (ROCSET) from this pin to GND. See

the over current protection section for equations.

Supply Input Pin. Connect this pin to a well-decoupled 5V or 12V

5

5

VCC

bias supply. It is also the positive supply for the lower gate driver,

LGATE.

Feedback Input Pin. This pin is the inverting input of the error

6

6

FB

amplifier. FB senses the switch output through an external

resistor divider network.

7

7

COMP/EN

Feedback Compensation. And could be used as EN pin, when

COMP < 0.4V, to disable entire chip.

8

8

PHASE

Switch Node. Connect this pin to the source of the upper

MOSFET and the drain of the lower MOSFET.

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4

is a registered trademark of Richtek Technology Corporation.

DS8120-08 September 2013

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