ADN8830 datasheet(4/24 Pages) AD

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REV. C

–4–

ADN8830

PIN FUNCTION DESCRIPTIONS

Pin No.

Mnemonic

Type

Description

THERMFAULT

Digital Output

Indicates an Open or Short-Circuit Condition from Thermistor.

THERMIN

Analog Input

Thermistor Feedback Input.

Digital Input

Puts Device into Low Current Shutdown Mode. Active low.

TEMPSET

Analog Input

Target Temperature Input.

TEMPLOCK

Digital Output

Indicates when Thermistor Temperature is within

±0.1°C of Target Tem-

perature as Set by TEMPSET Voltage.

6NCNo Connection, except as Noted in the Application Notes Section.

VREF

Analog Output

2.5 V Reference Voltage.

AVDD

Power

Power for Nondriver Sections. 3.0 V min; 5.5 V max.

OUT B

Analog Input

Linear Output Feedback. Will typically connect to TEC+ pin of TEC.

Analog Output

Drives Linear Output External NMOS Gate.

Analog Output

Drives Linear Output External PMOS Gate.

TEMPCTL

Analog Output

Output of Error Amplifier. Connects to COMPFB through feedforward

section of compensation network.

COMPFB

Analog Input

Feedback Summing Node of Compensation Amplifier. Connects to

TEMPCTL and COMPOUT through compensation network.

COMPOUT

Analog Output

Output of Compensation Amplifier. Connects to COMPFB through feed-

back section of compensation network.

VLIM

Analog Input

Sets Maximum Voltage across TEC.

VTEC

Analog Output

Indicates Relative Voltage across the TEC. The 1.5 V corresponds to 0 V

across TEC. The 3.0 V indicates maximum output voltage, maximum heat

transfer through TEC.

COMPSWOUT

Analog Output

Compensation for Switching Amplifier.

COMPSWIN

Analog Input

Compensation for Switching Amplifier. Capacitor connected between

COMPSWIN and COMPSWOUT.

OUT A

Analog Input

PWM Output Feedback. Will typically connect to TEC– pin of TEC.

PVDD

Power

Power for Output Driver Sections. 3.0 V min; 5.5 V max.

Digital Output

Drives PWM Output External PMOS Gate.

Digital Output

Drives PWM Output External NMOS Gate.

PGND

Ground

Power Ground. External NMOS devices connect to PGND. Can be

connected to digital ground as noise sensitivity at this node is not critical.

COMPOSC

Analog Input

Connect as Indicated in the Application Notes Section.

SYNCIN

Digital Input

Optional Clock Input. If not connected, clock frequency set by FREQ pin.

FREQ

Analog Input

Sets Switching Frequency.

SOFTSTART

Analog Input

Controls Initialization Time for ADN8830 with Capacitor to Ground.

SYNCOUT

Digital Output

Phase Adjusted Clock Output. Phase set from PHASE pin. Can be used to

drive SYNCIN of other ADN8830 devices.

PHASE

Analog Input

Sets Switching and SYNCOUT Clock Phase Relative to SYNCIN Clock.

AGND

Ground

Analog Ground. Should be low noise for highest accuracy.

TEMPOUT

Analog Output

Indication of Thermistor Temperature.

No Connection.

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