January 28, 2014

14

IDTP9167

Advanced Datasheet

ID setting resistor – RSET

The RSET resistor is used to configure the IDTP9167 with an individual identifier (ID). The identifier makes sure each device

can be correctly addressed by the host PMIC. Except for the case when the DPUs are connected to the host PMIC’s controller,

the device ID should be assigned in an ascending order starting with ID0. This ID assignment determines the switching phase

position of the particular DPU and, when set appropriately, ensures the output ripple is minimized as the switching phases of

all attached DPUs are automatically distributed uniformly in time. With respect to the output ripple, this effectively scales up

the equivalent switching frequency by the number of DPUs present.

When the DPUs are connected to the host PMIC’s controller, all DPUs must be assigned the same ID value for PFM mode to

operate. When one to three DPUs are used, ID0 should be selected as the common ID. When four DPUs are used, ID3

should be selected. It should be noted that when one or more DPUs are set to an identical ID using the same RSET resistor

value, the advantage of phase spreading (multi-phase) is lost since DPUs with identical ID will switch at the same time.

The RSET resistor value to device ID mapping is shown in Table 8.

RSET [kΩ]

ID

53.6

0

60.4

1

66.5

2

73.2

3

Table 8 – Recommended RSET values