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ADP1051

Digital Controller for Isolated Power Supply with PMBus Interface

Analog Devices 

Data Sheet

ADP1051

Pin No. Mnemonic

17

PG/ALT

18

VCORE

19

VDD

20

AGND

21

RES

22

ADD

23

RTD

24

OVP

EP

Description

Power Good Output (Open Drain). Connect this pin to VDD through a pull-up resistor (typically 2.2 kΩ).This signal

is referred to AGND. This pin is also used as an SMBus ALERT signal. (For information about the SMBus specification,

see the PMBus Features section.)

Output of 2.6 V Regulator. Connect a decoupling capacitor of at least 330 nF from this pin to AGND, as close as

possible to the ADP1051, minimizing the PCB trace length. It is recommended that this pin not be used as a

reference or to generate other logic levels using resistive dividers.

Positive Supply Input. Voltage of 3.0 V to 3.6 V. This signal is referred to AGND. Connect a 2.2 μF decoupling

capacitor from this pin to the AGND, as close as possible to the ADP1051, minimizing the PCB trace length.

Common Analog Ground. The internal analog circuitry ground and digital circuitry ground is star connected to

this pin through bonding wires.

Resistor Input. This pin sets up the internal reference for the internal PLL frequency. Connect a 10 kΩ resistor

(±0.1%) from this pin to AGND. This signal is referred to AGND.

Address Select Input. This pin is used to program the I2C/PMBus address. Connect a resistor from ADD to AGND.

This signal is referred to AGND.

Thermistor Input. Place a thermistor (R25 = 100 kΩ (1%), beta = 4250 (1%)) in parallel with a 16.5 kΩ (1%) resistor

and a 1 nF filtering capacitor. This pin is referred to AGND. Connect this pin to AGND if not in use.

Overvoltage Protection. This signal is used as redundant overvoltage protection. This signal is referred to AGND.

Exposed Pad. The ADP1051 has an exposed thermal pad on the underside of the package. For increased reliability

of the solder joints and maximum thermal capability, it is recommended that the exposed pad be soldered to the

PCB AGND plane.

Rev. B | Page 11 of 108

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