Rev 21 Jan 2014 15:09 | Page 10

The power input for the buck regulators is 4.5 V to 15 V. Shunt S1, S2, and S3 to allow for easy setup

by using all of the same input voltages for the buck regulators.

(3.0 V) as the VDDIO supply. See Table 2 for the power input details.

Table 2. Channels of Power Input Pins

Channel Pin

Input Jumper Input Range

CH1: Buck PVIN1 J11

4.5 V to 15 V

CH2: Buck PVIN2 S1

4.5 V to 15 V

CH3: Buck PVIN3 S2

4.5 V to 15 V

CH4: Buck PVIN4 S3

4.5 V to 15 V

VDDIO

VDDIO LK7

1.7 V to 3.6 V

Jumper J-SYNC (SYNC/MODE)

The Jumper J-SYNC, as shown in Figure 1, connects the SYNC/MODE pin of the device to either low or

high. Shunt the center contact of the J-SYNC jumper (SYNC/MODE) to the left pin header to pull the

SYNC/MODE pin high to VREG (5 V) to allow the buck regulators into forced PWM operation. In this

setting, use the PSMx_ON register setting in the ADP5051 GUI software to configure individual

PSM/FPWM operation for each buck.

Shunt the center contact of the J-SYNC jumper to the right pin header to pull the MODE pin low, which

forces the buck regulators to operate in automatic PWM/PSM operation. The PSMx_ON setting in the

ADP5051 GUI software is ignored.

Input Power Source

Before connecting the power source to the ADP5051/ADP5053 evaluation boards, ensure that the

evaluation board is turned off. If the input power source includes a current meter, use that meter to

monitor the input current. Connect the positive terminal of the power source to the PVIN1_4 terminal

(J11) on the evaluation board, and connect the negative terminal of the power source to the GND

terminal (J12) of the board.

If the power source does not include a current meter, connect a current meter in series with the input

source voltage. Connect the positive terminal of the power source to the positive lead (+) of the

current meter, connect the negative terminal of the power source to the GND terminal (J12) on the

evaluation board, and the connect the negative lead (−) of the current meter to the PVIN1_4 terminal

(J11) on the board.