ADPL12005/ADPL12006

20V, 5A/6A Fully Integrated Synchronous Buck

Converters

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Thermal Shutdown

Thermal shutdown protects the devices from excessive operating temperature. When the junction temperature exceeds

+175°C, an internal sensor shuts down the step-down converter, allowing the IC to cool. The sensor turns the IC on again

after the junction temperature cools by 15°C.

Multiphase Operation

The ADPL12005/ADPL12006 ICs are capable of dual-phase operation for high-current applications, and each IC can be

configured as a controller or a target. The multiphase operation is intended for forced-PWM mode only. SYNCOUT will

be 180 degrees out of phase with the controller clock. If the device is in Skip mode, then no clock will be present on

SYNCOUT. To enable low-IQ operation in dual-phase configuration, disable the EN of the target to turn OFF the IC and

save quiescent current.

For a target, connect SYNCOUT to BIAS. When EN is high, there will be a procedure to detect if the IC is a controller

(SYNCOUT is not connected to BIAS) or a target. The VEA pin will be the voltage-error amplifier output for the controller

or the current-error amplifier input for the target. Connect the VEA pin of the controller to the VEA pin of the target to

ensure balanced current sharing between the two phases. Use two separate resistor-dividers for each IC to avoid the FB

pins of the controller and target being connected at the same point. Since the target IC uses the outer voltage loop of the

controller (through the VEA pin), any mismatch in the output voltage is avoided. See Figure 1 for a dual-phase

configuration setup using the ADPL12005/ADPL12006.

RFB1

CONTROLLER

TARGET

OUT

OUT

BIAS

BIAS

RFB1

RFB2

RFB2

2.2µF

2.2µF

Figure 1. Typical Dual-Phase Configuration Setup