L6460 datasheet(31/139 Pages) STMICROELECTRONICS

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L6460

Internal supplies

Doc ID 17713 Rev 1

31/139

4.2

Charge pump regulator

L6460 implements a charge pump regulator to generate a voltage over VSupply.This voltage

is used to drive internal circuits and the external FET driver and cannot be used for any

other purpose.

This circuit is always under the supervisory circuit control, so no regulator can start before

the VPump voltage reaches its undervoltage rising threshold. If VPump voltage falls down

below its under voltage falling threshold, all the regulators will be switched off.

The charge pump circuit is disabled when L6460 is in “low power mode”.

Figure 4.

Charge pump block diagram

An example of capacitors value is:

FLY = 100 nF and CBOOST = 1 µF

4.3

V3v3 regulator

V3v3 is the output of an internal regulator used to supply some low voltage internal circuits.

This regulator is not intended to provide external current so it must not be used to supply

external loads. An external capacitor must always be connected from this pin to GND,

recommended value is in the range 80 ÷ 120 nF.

Driver

CFLY

CPH

VSupply

CPL

VPump

CBOOST

CLKBOOST

EnVPump

Ref

VSupplyInt

for VSupply lower than 15V,

external diodes are required

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