ADP5053

Data Sheet

Rev. B | Page 10 of 36

Pin No.

Mnemonic

Description

32

BST1

High-Side FET Driver Power Supply for Channel 1.

33, 34

SW1

Switching Node Output for Channel 1.

35, 36

PVIN1

Power Input for the Internal 5.1 V VREG Linear Regulator and the Channel 1 Buck Regulator. Connect a bypass

capacitor between this pin and ground.

37

EN1

Enable Input for Channel 1. An external resistor divider can be used to set the turn-on threshold.

38

SS12

Connect a resistor divider from this pin to VREG and ground to configure the soft start time for Channel 1 and

Channel 2 (see the Soft Start section).This pin is also used to configure parallel operation of Channel 1 and Channel 2

(see the Parallel Operation section).

39

COMP1

Error Amplifier Output for Channel 1. Connect an RC network from this pin to ground.

40

FB1

Feedback Sensing Input for Channel 1.

41

RT

Frequency Setting. Connect a resistor from RT to ground to program the switching frequency from 250 kHz to

1.4 MHz. For more information, see the Oscillator section.

42

VDD

Output of the Internal 3.3 V Linear Regulator. Connect a 1 µF ceramic capacitor between this pin and ground.

43

SYNC/MODE

Synchronization Input/Output (SYNC). To synchronize the switching frequency of the device to an external

clock, connect this pin to an external clock with a frequency from 250 kHz to 1.4 MHz. The SYNC function of

this pin can also be configured as a synchronization output by factory fuse.

Forced PWM or Automatic PWM/PSM Selection Pin (MODE). When this pin is logic high, the device operates in

forced PWM (FPWM) mode. When this pin is logic low, the device operates in automatic PWM/PSM mode.

44

VREG

Output of the Internal 5.1 V Linear Regulator. Connect a 1 µF ceramic capacitor between this pin and ground.

45

FB3

Feedback Sensing Input for Channel 3.

46

COMP3

Error Amplifier Output for Channel 3. Connect an RC network from this pin to ground.

47

SS34

Connect a resistor divider from this pin to VREG and ground to configure the soft start time for Channel 3 and

Channel 4 (see the Soft Start section).

48

EN3

Enable Input for Channel 3. Use an external resistor divider to set the turn-on threshold.

0

EPAD

Exposed Pad (Analog Ground). The exposed pad must be connected and soldered to an external ground plane.