ASL1507SHN; ASL2507SHN

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

mode

Rev. 1 — 26 April 2018 Product data sheet

1 Introduction

The ASL1507SHN is a highly integrated and flexible one-phase DC-to-DC boost

converter IC. The IC has one integrated gate driver which can drive one external

power metal-oxide-semiconductor field-effect transistor (MOSFET) and two integrated

proportional-integral (PI) controllers which can regulate the output voltage. It has a serial

peripheral interface (SPI) allowing control and diagnostic communication with an external

microcontroller.

The ASL2507SHN is a highly integrated and flexible two-phase DC-to-DC boost

converter IC. The IC has two integrated gate drivers which can drive two external power

metal-oxide-semiconductor field-effect transistors (MOSFETs) and two integrated

proportional-integral (PI) controllers which can regulate the output voltage on both

channels. It has a serial peripheral interface (SPI) allowing control and diagnostic

communication with an external microcontroller.

The ASL1507SHN; ASL2507SHN is designed primarily for use in automotive LED

lighting applications and provides an optimized supply voltage for ASLx416/17SHN

multichannel LED buck driver.

For simplicity, the data sheet states always 'gate drivers' and 'output voltages'. The

ASL1507SHN has only one gate driver and can only drive one output.

2 General description

The ASL1507SHN; ASL2507SHN has a fixed frequency peak current mode control with

parabolic/non‑linear slope compensation. It can operate with input voltages from 5.5 V to

40 V. It can be configured in boost topology via SPI for output voltages of up to 80 V, to

power the LED buck driver IC.

The ASL1507SHN is a single-phase boost converter with one output voltage. The

ASL2507SHN is a two-phase boost converter, which can have two independent outputs.

The ASL2507SHN is configurable via the SPI interface, as a single output converter with

either one phase or two phases, or two independent output voltages. In case the SPI

communication is lost in an abnormal situation, it switches to limp-home mode operation

ensuring system safety.

The ASL1507SHN; ASL2507SHN boost converter can drive up to two external low-side

N channel MOSFETs from an internally regulated adjustable supply. It can drive either

logic or standard level MOSFETs.

The integrated SPI interface also allows for programming the supply under/overvoltage

range, output voltage range, frequency spread spectrum, and DC-to-DC switching

frequency. It enables the optimization of external components and flexibility for

electromagnetic compatibility (EMC) design. This interface can be used also to provide

diagnostic information such as the device temperature, battery voltage, VGG voltage,

output voltage etc.

NXP Semiconductors

ASL1507SHN; ASL2507SHN

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

Product data sheet Rev. 1 — 26 April 2018

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The ASL1507SHN; ASL2507SHN integrates a non-volatile memory (NVM) to save

the default configuration internally. The configuration includes boost ramp-up, boost

voltage, frequency setting, error detection and etc. The default configuration is used in

limp‑home mode (SPI fail) and autonomous mode (no MCU). Additional features include

input undervoltage lockout and thermal shutdown when the junction temperature of the

ASL1507SHN; ASL2507SHN exceeds T

sd(otp)

The device is housed in a very small HVQFN32 package with an exposed thermal pad.

It is designed to meet the stringent requirements of automotive applications. It is fully

AEC-Q100 grade 1 qualified. It operates over the −40 °C to +125 °C ambient automotive

temperature range.

3 Features and benefits

• AEC-Q100 grade 1 qualified

• Limp-home mode ensuring system safety

• Up to two flexible output voltages with 3 % accuracy programmable via SPI

• Single phase on each output or double phase on one output

• Fixed frequency operation via built-in oscillator from 125 kHz to 700 kHz

• Slope compensation to track the frequency and output voltage

• Programmable control loop compensation

• Programmable spread spectrum functionality

• Gate switching is halted when overvoltage on output is detected

• Programmable gate voltage

• Low electromagnetic emission (EME) and high electromagnetic immunity (EMI)

• Output voltage monitoring

• Supply voltage measurement

• Control signal to enable the device low quiescent current < 5 μA when EN = 0

• Read-back programmed voltage and frequency range via SPI

• Junction temperature monitoring via SPI

• Small package outline HVQFN32

• Wide operating input voltage range from +5.5 V to +40 V

• Operating ambient temperature range of −40 °C to +125 °C

4 Applications

• Automotive LED lighting

– Daytime running lights

– Position or park light

– Low beam

– High beam

– Turn indicator

– Fog light

– Cornering light