RT9618GS datasheet(11/12 Pages) RICHTEK

Part #	RT9618GS

Description	Synchronous-Rectified Buck MOSFET Drivers

PDF	12 Pages

Scroll/Zoom	100%

Manufacturer	RICHTEK [Richtek Technology Corporation]

Direct Link	http://www.richtek.com

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11 / 12 page

RT9618/A

DS9618/A-04 March 2007

www.richtek.com

Figure 6. Two-Phase Synchronous Buck Converter Circuit

BOOT

UGATE

PHASE

LGATE

VCC

VIN

PGND

1uF

12V

1uF

PHB83N03LT

PHB95N03LT

2uH

1uF

1000uF

1.2uH

12V

1500uF

PWM

CORE

When layout the PCB, it should be very careful. The power-

circuit section is the most critical one. If not configured

properly, it will generate a large amount of EMI. The junction

of Q1, Q2, L2 should be very close.

Next, the trace from UGATE, and LGATE should also be

short to decrease the noise of the driver output signals.

PHASE signals from the junction of the power MOSFET,

carrying the large gate drive current pulses, should be as

heavy as the gate drive trace. The bypass capacitor C4

should be connected to PGND directly. Furthermore, the

bootstrap capacitors (CB) should always be placed as close

to the pins of the IC as possible.

RT9618GS Datasheet(PDF) 11 Page - Richtek Technology Corporation