L6460 STMicroelectronics, L6460 Datasheet - Page 45

• Manufacturer Part Number: L6460
• Description: MOSFET & Power Driver ICs SPI Config Stepper DC Multi Motor DRV
• Manufacturer: STMicroelectronics
• Type: Full-Bridge Driverr

Specifications of L6460

• Product: Half-Bridge Drivers
• Rise Time: 0.4 us
• Fall Time: 0.4 us
• Supply Voltage (max): 38 V
• Supply Voltage (min): 13 V
• Supply Current: 11 mA
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Number Of Drivers: 4
• Output Current: 10 mA
• Output Voltage: 30 V
• Package / Case: TQFP-64
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L6460
10
10.1
Power saving modes
Saving power is very important for today platforms: L6460 implements different functions to
achieve different levels of power saving. Sections here below describe these different power
saving modes.
Standby mode
Almost all low voltage circuitry inside L6460 are powered by V
regulator is a linear regulator powered by V
by V
consumption is:
because V
This power could be reduced by using a switching buck regulator to supply V
case, assuming the buck regulator efficiency near to 100%, the dissipated power would
become:
To achieve this result there is the need to switch off the internal V
use an additional pin to provide a 3.3 V supply to internal circuits. L6460 can do this by
using the low voltage switch implemented on GPIO6 pin. This switch internally connects
V
V
Figure 7.
The StdByMode bit used to switch off V
by writing the standby command in the StdByMode register. L6460 exits standby mode if a
reset event happens or “Low Power mode” is selected.
Because all internal low voltage circuitry powered by V
voltage rail, when the standby mode is used, V
GPIO_SPI
GPIO_SPI
3v3
regulator is directly coming from V
voltage to GPIO6 output so, by externally connecting GPIO6 to V
voltage can be provided to low voltage circuitry inside L6460.
SupplyInt
1.9 V
StdByMode
3.3 V
Standby mode function description
is feeded by V
1
0
Low voltage power = V
Low voltage power ≈ 3.3V * I
Doc ID 17713 Rev 1
-
+
Supply
, directly or with a resistor in series.
3v3
Regulator
VSupplyInt
V3v3
SupplyInt
SupplyInt.
and switch on the power switch can be set to ‘1’
GPIO_SPI
and therefore the total power
Supply
This means that all the current provided
3v3
is requested to be at 3.3V.
* I
V3v3
are designed to work with a 3.3V
V3v3
.
3v3
.
3v3
internal regulator; this
GPIO6
VGPIOSpi
linear regulator and to
Power saving modes
External
connection
3v3
3.3V
3v3
pin, the
: in this
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