CS5305GDWR28 datasheet(10/33 Pages) ONSEMI

10 / 33 page

CS5305

http://onsemi.com

PACKAGE PIN DESCRIPTION

Package Pin Number

Pin Symbol

Pin Name

Function

SO−28L

OCSET

Over−Current Set

Resistor divider from ROSC to GND programs the threshold of the hiccup

over−current protection.

ROSC

Oscillator Frequency

Adjust

Resistance to GND programs the oscillator frequency. It also programs the VFB

bias current shown in Figure 5.

ENABL

Enable Input

TTL−Compatible logic input with 50 kΩ internal pull−up resistor to 3.3 V. A logic

low puts the IC in FAULT mode.

4−6

CS1−3

Current Sense Inputs

Non−inverting inputs to the current sense amplifiers.

CSREF

Current Sense

Reference

Inverting input to the current sense amplifiers, and fast feedback input to the

PWM comparator.

IFB

Share Current Amp

Inverting Input

Inverting input to share current amp. Connect resistor divider between IOUT, IFB,

and IC GND pin 28 to program Share Current Amp gain.

IOUT

Share Current Amp

Output

Share current amplifier output and input to share adjust amplifier.

Share Bus

Connect with other modules for single−wire current sharing.

SCOMP

Share Compensation

Connect compensation network to stabilize share loop.

VDRP

Current Sense Output

for AVP

The offset of this pin above the DAC voltage is proportional to the output current.

Connect a resistor from this pin to VFB to program the AVP voltage or leave this

pin open for no AVP.

VFB

Voltage Feedback

Error Amp inverting input. Input bias current used to program AVP light load

offset via resistor connected to converter output voltage. Short VFB to the

converter output voltage for no AVP.

COMP

Error Amp Output and

PWM Comparator

Input

Provides loop compensation. Also used to control Softstart and Fault timing.

PWRGD

Power Good Output

Open collector output goes low when VFB is out of regulation. User must

externally limit current into this pin to less than 20 mA.

16−20

VID4−VID0

Voltage ID DAC

Inputs

Programs Output Voltage. 50 kΩ internal pull−up resistors to 3.3 V.

PWRGDS

Power Good Sense

Provides remote output voltage sensing.

SGND

Reference Ground

Ground connection for the DAC. Provides remote sensing of ground at the load.

VCC

Supply Input

IC Power Supply Input.

DRVON

Driver Enable

Logic High enables outputs of compatible MOSFET Driver ICs. Low turns all

MOSFETs OFF. Pin driven from internal 5.5 V; 70 kΩ internal resistor to GND.

25−27

GATE 3−1

FET Driver Outputs

PWM Signal Input to external MOSFET Gate Driver ICs.

GND

Ground

IC Power Supply Return; connected to IC substrate.

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