Datasheet

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 V
Supply
.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 V
Pump
voltage reaches its undervoltage rising threshold. If V
Pump
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: C
FLY
= 100 nF and C
BOOST
= 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
C
FLY
-
+
CPH
VSupply
CPL
V
Pump
C
BOOST
CLK
BOOST
E
nVPump
Ref
M1
M2
VSupplyInt
for VSupply lower than 15V,
external diodes are require
d