1. Introduction
The ASL2500SHN is a highly integrated and flexible two-ph ase DC-to-DC boost converter
IC. It has an SPI interface allowing control an d diagnostic communicatio n with an external
microcontroller.
It is designed primarily for use in automotive LED lighting applications and provides an
optimized supp ly vo ltage for ASLx 415SHN Multi-channel LED Buck Driver.
2. General description
The ASL2500SHN 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 via SPI for outpu t voltages o f up to 80 V, to power the LED buck
driver IC.
The ASL2500SHN is a two-phase converter which can have two independent outputs.
The flexible driver can be configured, via the SPI interfac e, as a single output converter , or
with multiple combinations of number of outputs and phases.
The ASL2500SHN boost co nverter 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/over voltage
range, output voltage range an d DC-to-DC switching frequency. It enables the
optimization of external componen ts and flexibility for EMC design. This interface can also
be used to provide diagnostic information such as the driver temperature.
Additional features include input under-voltage lockout and thermal shutdown when the
junction temperature of the ASL2500SHN exceeds +175 C.
The device is housed in a very small HVQFN32 pin package with an exposed thermal
pad. It is designed to meet the stringent requiremen ts of au tomotive applications. It is fully
AEC Q100 grade 1 qualified. It operates ove r the 40 C to +125 C ambient automotive
temperature range.
ASL2500SHN
Two phase boost converter
Rev. 3 — 26 October 2017 Product data sheet
ASL2500SHN All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2017. All rights reserved.
Product data sheet Rev. 3 — 26 October 2017 2 of 39
NXP Semiconductors
ASL2500SHN
Two phase boost converter
3. Features and benefits
The ASL2500SHN is an automotive grade product th at is AEC-Q100 grade 1 q ualified.
Operating ambient temperature range of 40 C to +125 C
Wide operating input voltage range from +5.5 V to +40 V
Output voltage programmable via SPI interface
Multi-phase operation for higher power
Up to two phases per output
Up to two flexible output voltages with 3 % accuracy programmable via SPI
Both output voltages can be controlled independently
Fixed Frequency Operation via built-in oscillator
Slope compensation to track the frequency and output voltage
Programmable co ntrol loop compensation
Fast high efficiency FET switching
Programmable internal gate driver voltage regulator
Gate switching is halted when overvoltage on output is detected
Support both Logic Level and Standard Level FETs
Low Electro Magnetic Emission (EME) and high Electro Magnetic Immunity (EMI)
Output voltag e monitoring
Supply voltage measurement
Control signal to enable the device
Read-back programmed voltage and frequency range via SPI
Junction temperature monitoring via SPI
Small package outline HVQFN32
Low quiescent curren t <5 A at 25 C when EN = 0
4. Applications
Automotive LED lighting
Daytime running lights
Position or park light
Low beam
High beam
Turn indicator
Fog light
Cornering light
5. Ordering information
Table 1. Ordering information
Type number Package
Name Description Version
ASL2500SHN HVQFN32 plastic thermal enhanced very thin quad flat package; no leads; 32 terminals;
body 5 5 0.85 mm
SOT617-12