ADPL12008/ADPL12010

20V, 8A/10A Fully Integrated Buck Converter

with 20μA Quiescent Current and Dual-Phase

Capability

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Analog Devices | 13

Low-IQ Operation in Dual-Phase

The ADPL12008/ADPL12010 ICs feature dual-phase capability, allowing each IC to be configured as either a controller

or a target. The SYNCOUT pin of the controller outputs a 180° out-of-phase clock when SYNC is tied high (FPWM mode).

For low-IQ mode, pull the SYNC pin of the controller low (skip-mode). In this mode, there is no clock present on the

SYNCOUT pin of the controller, and the controller IC enters the skip-mode. The internal circuit of the target IC remains

ON during this time and actively looks for the SYNCOUT signal from the controller. As the target IC is ON, the quiescent

current is slightly higher, even though both the ICs skip pulses.

To improve the light-load efficiency and further reduce the IQ, pull the target EN low. This disables the target and its

internal circuits, which further reduces the IQ. Table 1 summarizes the truth table for low-IQ operation.

Table 1. Configurations for Low-IQ Operation

CONTROLLER

TARGET

MODE

EN = High, SYNC = BIAS

EN = High

FPWM (high IQ)

EN = High, SYNC = Low

EN = High

Skip-mode (low IQ)

EN = High, SYNC = Low

EN = Low

Standby-mode (ultra-low IQ)

EN = Low

EN = High

Not allowed