ASL1507SHN datasheet(24/56 Pages) NXP

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NXP Semiconductors

ASL1507SHN; ASL2507SHN

Single-phase and two-phase boost converter with limp-home mode

ASL1507_ASL2507

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Product data sheet

Rev. 1 — 26 April 2018

24 / 56

8.8.2 Undervoltage detection

The ASL1507SHN; ASL2507SHN offers a variable undervoltage detection threshold.

When the supply voltage drops below this threshold, the undervoltage detect bit is set

and the gate pin stops toggling and no more power is delivered to the output.

Table 37. Undervoltage threshold register (address 1Bh)

Bit

Symbol

Description

Value

Function

00h

undervoltage detection threshold = 0 V

...

undervoltage detection threshold = 0.3606 V × V_VBAT_UV[7:0]

7 to 0 V_VBAT_UV[7:0] undervoltage

detection threshold

FFh

maximum undervoltage detection threshold = 90 V

8.8.3 Overvoltage detection

The ASL1507SHN; ASL2507SHN offers a variable overvoltage detection threshold.

When the supply voltage rises above this threshold, the overvoltage detect bit is set and

fail silent mode is entered. The gate pin stops toggling and no power is delivered to the

output.

Table 38. Overvoltage threshold register (address 1Ah)

Bit

Symbol

Description

Value

Function

00h

overvoltage detection threshold = 0 V

...

overvoltage detection threshold = 0.3606 V × V_VBAT_OV[7:0]

7 to 0 V_VBAT_OV[7:0] overvoltage

detection threshold

FFh

maximum overvoltage detection threshold = 90 V

8.9 Junction temperature information

The ASL1507SHN; ASL2507SHN provides a measurement of the IC junction

temperature. The measurement information is available in the junction temperature

Table 39. Junction temperature register (address 46h)

Bit

Symbol

Description

Value

Function

00h to 17h

device junction temperature below −40 °C

18h

device junction temperature = −40 °C

...

device junction temperature

= T_JUNCTION[7:0] × (215 / 106) °C − 88 °C

82h

device junction temperature = 175 °C

7 to 0 T_JUNCTION[7:0]

junction temperature

83h to FFh

device junction temperature above 175 °C

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