PM6652 datasheet(37/53 Pages) STMICROELECTRONICS

37 / 53 page

PM6652

Device description

Doc ID 16867 Rev 5

37/53

Equation 18

given

δV

LKG the voltage drop across the current sensing filter resistor, due to the CSNS pin

leakage current (see

Equation 13) and

δR

TH/RSNS the current sensing element variation due

to temperature increase.

If the current monitoring function is not required, IMONFB should be connected to SVCC

and IMON can be left floating.

CFILT (Figure 39) can be required by the CPU/GPU in order to filter the current monitor

ripple due to inductor current ripple.

Equation 19

A typical value for CFILT is 47 nF or bigger (IMVP6.5 specifications suggest

CFILT*RIMON>=300 µs).

The IMON voltage is limited to 1.15 V (maximum value), as required by IMVP6.5

specifications, in order to avoid any damage to the CPU. This feature is performed by

limiting the current injected by the PM6652 IMON pin into the RIMON resistor.

Figure 39.

Current monitor with external components

8.10.3

Thermal throttling

The voltage regulator thermal throttling function is used by the CPU in order to avoid

catastrophic thermal damage.

The VRTT# open drain output pin is forced down when the THERM voltage is lower than an

internal threshold (1.0 V typ. and 200 mV hysteresis). An external NTC resistor, placed near

⎟⎟⎠

⎞

⎜⎜⎝

⎛ δ

⎟⎟⎠

⎞

⎜⎜⎝

⎛

⋅

SNS

AVCL

SNS

LKG

AVCL

DCR

IMON

FILT

≥

⋅

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