9.1.2 PG Pull Up Resistor

The PG output is an open drain signal which connects to a voltage source through a pull up resistor R_PU. The PG signal can be used to drive the enable pins of downstream devices, EN. PG is active high, and its voltage is given by Equation 7.

Equation 7.

where

• V_OUT is the voltage where PG is tied to
• I_PG,LK is the leakage current into PG pin
• I_EN,LK is the leakage current into the EN pin driven by PG
• R_PU is the pull up resistance

V_PG needs to be higher than V_IH,MIN of the EN pin to be treated as logic high. The maximum R_PU is determined by Equation 8.

Equation 8.

When PG is disabled, with 1 mA current into PG pin (IPG = 1 mA), V_PG.OL is less than 0.2 V and treated as logic low as long as V_IL,MAX of the EN pin is greater than 0.2 V. The minimum R_PU is determined by Equation 9.

Equation 9.

R_PU can be chosen within the range defined by R_PU,MIN and R_PU,MAX. R_PU = 10 kΩ is used for characterization.