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ADP1051

Digital Controller for Isolated Power Supply with PMBus Interface

Analog Devices 

ADP1051

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

Data Sheet

VS– 1

VS+ 2

CS2– 3

CS2+ 4

VF 5

CS1 6

ADP1051

TOP VIEW

18 VCORE

17 PG/ALT

16 CTRL

15 SDA

14 SCL

13 SYNI/FLGI

NOTES

1. 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.

Figure 3. Pin Configuration

Table 4. Pin Function Descriptions

Pin No. Mnemonic Description

1

VS−

Inverting Voltage Sense Input. This is the connection for the ground line of the power rail. Provide a low ohmic

connection to AGND. To allow for trimming, it is recommended that the resistor divider on this input have

a tolerance specification of ≤0.5%.

2

VS+

Noninverting Voltage Sense Input. This signal is referred to VS−. To allow for trimming, it is recommended that the

resistor divider on this input have a tolerance specification of ≤0.5%.

3

CS2−

Inverting Differential Current Sense Input. For best operation, use a nominal voltage of 1.12 V. When using low-

side current sensing, place a 4.99 kΩ level shifting resistor between the sense resistor and this pin. When using

high-side current sensing in a 12 V application, place a 5.62 kΩ resistor between the sense resistor and this pin.

When using high-side current sensing, apply the formula R = (VOUT − 1.12 V)/1.915 mA. A 0.1% resistor must be

used to connect this circuit. If this pin is not used, connect it to AGND and set the CS2 current sense to high-side

current sense mode (Register 0xFE19[7] = 1 binary).

4

CS2+

Noninverting Differential Current Sense Input. For best operation, use a nominal voltage of 1.12 V. When using

low-side current sensing, place a 4.99 kΩ level shifting resistor between the sense resistor and this pin. When

using high-side current sensing in a 12 V application, place a 5.62 kΩ resistor between the sense resistor and this

pin. When using high-side current sensing, apply the formula R = (VOUT − 1.12 V)/1.915 mA. A 0.1% resistor must

be used to connect this circuit. If this pin is not used, connect it to AGND and set the CS2 current sense to high-

side current sense mode (Register 0xFE19[7] = 1 binary).

5

VF

Three optional functions can be implemented with this pin: feedforward, primary side input voltage sensing, and

input voltage UVLO protection. The pin is connected upstream of the output inductor through a resistor divider

network. The nominal voltage at this pin should be 1 V. This signal is referred to AGND.

6

CS1

Primary Side Current Sense Input. This pin is connected to the primary side current sensing ADC and to the cycle-

by-cycle current-limit comparator. This signal is referred to AGND. The resistors on this input must have a

tolerance specification of ≤0.5% to allow for trimming. Connect this pin to AGND if not in use.

7

SR1

PWM Logic Output Drive. This pin can be disabled when not in use. This signal is referred to AGND.

8

SR2

PWM Logic Output Drive. This pin can be disabled when not in use. This signal is referred to AGND.

9

OUTA

PWM Logic Output Drive. This pin can be disabled when not in use. This signal is referred to AGND.

10

OUTB

PWM Logic Output Drive. This pin can be disabled when not in use. This signal is referred to AGND.

11

OUTC

PWM Logic Output Drive. This pin can be disabled when not in use. This signal is referred to AGND. This pin can

also be programmed as a synchronization signal output (SYNO).

12

OUTD

PWM Logic Output Drive. This pin can be disabled when not in use. This signal is referred to AGND. This pin can

also be programmed as a synchronization signal output (SYNO).

13

SYNI/FLGI Synchronization Signal Input (SYNI)/External Signal Input to Generate a Flag Condition (FLGI). Connect this pin to

AGND if not in use.

14

SCL

I2C/PMBus Serial Clock Input and Output (Open Drain). This signal is referred to AGND.

15

SDA

I2C/PMBus Serial Data Input and Output (Open Drain). This signal is referred to AGND.

16

CTRL

PMBus Control Signal. It is recommended that a 1 nF capacitor be connected from the CTRL pin to AGND for noise

debounce and decoupling. This signal is referred to AGND.

Rev. B | Page 10 of 108

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