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ADP3164

5-Bit Programmable 4-Phase Synchronous Buck Controller

Analog Devices 

ADP3164

PIN FUNCTION DESCRIPTIONS

Pin Mnemonic

1–5 VID4 –

VID0

6 SHARE

7 COMP

8 GND

9 FB

10 CT

11 PWRGD

12 CS+

13 CS–

14 PGND

15 PWM4

16 PWM3

17 PWM2

18 PWM1

19 REF

20 VCC

Function

Voltage Identification DAC Inputs. These pins are pulled up to an internal 3 V reference, providing a

Logic 1 if left open. The DAC output programs the FB regulation voltage from 1.1 V to 1.85 V. Leaving all five

DAC inputs open results in the ADP3164 going into a “No CPU” mode, shutting off its PWM outputs.

Current Sharing Output. This pin is connected to the SHARE pins of other ADP3164s in multiple VRM systems

to ensure proper current sharing between the converters. The voltage at this output programs the output current

control level between CS+ and CS–.

Error Amplifier Output and Compensation Point.

Ground. FB, REF, and the VID DAC of the ADP3164 are referenced to this ground. This is a low current ground

that can also be used as a return for the FB pin in remote voltage sensing applications.

Feedback Input. Error amplifier input for remote sensing of the output voltage.

External capacitor CT connection to ground sets the frequency of the device.

Open drain output that signals when the output voltage is outside of the proper operating range or when a phase

is not supplying current even if the output voltage is in specification.

Current Sense Positive Node. Positive input for the current comparator. The output current is sensed as a voltage

at this pin with respect to CS–.

Current Sense Negative Node. Negative input for the current comparator.

Power Ground. All internal biasing and logic output signals of the ADP3164 are referenced to this ground.

Logic-Level Output for the Phase 4 Driver.

Logic-Level Output for the Phase 3 Driver.

Logic-Level Output for the Phase 2 Driver.

Logic-Level Output for the Phase 1 Driver.

3.0 V Reference Output.

Supply Voltage for the ADP3164.

5-BIT CODE

100⍀

100nF

ADP3164

1 VID4

2 VID3

3 VID2

4 VID1

VCC 20

REF 19

PWM1 18

20k⍀

PWM2 17

5 VID0

PWM3 16

6 SHARE PWM4 15

7 COMP

PGND 14

8 GND

CS– 13

9 FB

CS+ 12

10 CT

PWRGD 11

+

1␮F

12V

100nF

VFB

AD820

1.2V

Figure 1. Closed-Loop Output Voltage Accuracy Test Circuit

–4–

REV. 0

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