RT9246APC datasheet(3/16 Pages) RICHTEK

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RT9246A

DS9246A-04 March 2007

www.richtek.com

Functional Pin Description

VID4 (Pin 1), VID3 (Pin 2), VID2 (Pin 3), VID1 (Pin 4),

VID0 (Pin 5)

DAC voltage identification inputs for K8. These pins are

internally pulled to 2.2V if left open.

NC (Pin 6, Pin 20, Pin 24)

No Input Connection

FBRTN (Pin 7)

VCORE differential sense return.

FB (Pin 8)

Inverting input of the internal error amplifier.

COMP (Pin 9)

Output of the error amplifier and input of the PWM

comparator.

PGOOD (Pin 10)

Power good open-drain output.

DVD (Pin 11)

Programmable power UVLO detection or converter enable

input.

SS (Pin 12)

Connect this SS pin to GND with a capacitor to set the

soft-start time interval and to smooth VCORE transient at

VID Jump.

RT (Pin 13)

Switching frequency setting. Connect this pin to GND with

a resistor to set the frequency.

VOSS (Pin 14)

VCORE initial value offset. Connect this pin to GND with a

resistor to set the offset value.

IMAX (Pin 15)

Over-Current protection set.

ICOMMON (Pin 16)

Common negative input of current sense amplifiers for all

three channels.

IOUT (Pin 17)

Output current indication pin. The current through IOUT

pin is proportional to the output current.

ADJ (Pin 18)

Current sense output for active droop adjust. Connect a

resistor from this pin to GND to set the load droop.

GND (Pin 19)

IC ground.

ISP1 (Pin 23), ISP2 (Pin 22), ISP3 (Pin 21)

Current sense positive input pins for individual converter

channel current sensing.

PWM1 (Pin 27), PWM2 (Pin 26), PWM3 (Pin 25)

PWM outputs for each driven channel. Connect these pins

to the PWM input of the MOSFET driver. For systems

which use 2 channels, connect PWM3 high.

VCC (Pin 28)

IC power supply. Connect this pin to a 5V supply.

Oscillator Ferquency vs. RRT

100

200

300

400

500

600

700

2030

4050

6070

RRT (k◊ )

Ω)

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