ASL4501SHN datasheet(21/43 Pages) NXP

21 / 43 page

ASL4501SHN

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 2 — 10 January 2018

21 of 43

NXP Semiconductors

ASL4501SHN

Four-phase boost converter

8.7 Gate supply voltage

The ASL4501SHN has an integrated linear regulator to generate the supply voltage of the

gate drivers. The integrated linear regulator is internally connected to the pins VGG1 and

VGG2. The voltage generated by the linear regulator can be set via the VGG control

If a setting between 00h and 5Dh is used, a gate driver voltage is targeted that exceeds

the limiting values of the IC. Do not program these settings. To ensure that only values in

the allowed range are set inside the IC, read back the programmed value immediately

after setting it.

If a setting between FFh and B7h is used, the device may not start up VGG. If the device

operates, parameters of VGG are not guaranteed.

8.7.1 Gate voltage supply diagnostics

The diagnostic options for the gate voltage supply are:

• Gate driver available; details can be found in Section 8.10

• Gate driver protection active; details can be found in Section 8.10

8.8 Supply voltage monitoring

When at least one of the outputs is enabled and bit VGG_ok is set, the ASL4501SHN

continuously measures the voltage at pin VBAT. It allows the system to monitor the supply

voltage without additional external components. It also offers the option to put an

automatic undervoltage or overvoltage protection in place.

Note: The VIN_UV and VIN_OV bits in the status register use the battery voltage

measurement. As a result, the VIN_UV and VIN_OV bits are only reliable when at least

one output is enabled.

8.8.1 Battery voltage measurement

The ASL4501SHN continuously measures the voltage at pin VBAT. The measurement

result is available in the battery voltage register when at least one output is enabled.

Table 30.

VGG control register (address 15h)

Bit

Symbol

Description

Value Function

7 to 0 VGG[7:0]

supply voltage for gate drivers

00h

not allowed

...

not allowed

5Dh

maximum output voltage = 10.3 V

...

16.25 V

 64 mV  VGG[7:0]

B7h

minimum output voltage = 4.54 V

...

not allowed

FFh

not allowed

ASL4501SHN Datasheet(PDF) 21 Page - NXP Semiconductors

ASL4501SHN Datasheet(HTML) 21 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43

Datasheet Download

Link URL