Rev 21 Jan 2014 15:09 | Page 23

Enabling the Low Input Voltage Detection (ADP5051 Only)

In addition to the undervoltage lockout (UVLO), the ADP5051 includes a low input voltage detection

circuit (to monitor PVIN1 only) that compares the input voltage against the specified voltage threshold,

which is adjustable from 4.2 V to 11.2 V with 0.5 V steps in Register 8, TH_CFG.

Unlike the UVLO shutdown, the low input voltage warning function only sends out a warning signal

without any shutdown. When the input voltage drops below the threshold, the status bit, LVIN_INT,

goes high. To clear the LVIN_INT status bit, write 1b to the status bit. The LVIN_INT bit status is

latched until the bit is cleared.

Use the ADP5051 GUI software to set the LVIN_TH bit to enable the low input voltage detection

feature. Configure LVIN_INT to source the low input fault into the nINT pin.

Enabling the Dynamic Voltage Scaling (ADP5051 Only)

The ADP5051 provides a dynamic voltage scaling (DVS) function for Channel 1 and Channel 4, and

the DVS function, FB1 and FB4 must be connected to the output by placing a 0 Ω resistor on R

Use the ADP5051 GUI software to set DVSx-INTVAL and enable DVSx-ON in Register 0x05. Then,

change the different VID options in the CHx VOUTx register to obtain a real-time output voltage step

up or step down.

Note that to avoid rapid output voltage changes to the next target value that result in abnormal

problems, such as PWRGD failure, OVP latch-off, or hiccup, enable the DVS function prior to

setting VID.

EVALUATION BOARD SCHEMATICS AND

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