ZXLD1370Q

Document number: DS37117 Rev. 4 - 2

1 of 39

www.diodes.com

February 2018

© Diodes Incorporated

ZXLD1370Q

AUTOMOTIVE COMPLIANT 60V HIGH ACCURACY BUCK/

BOOST/BUCK-BOOST LED DRIVER-CONTROLLER

Description

The ZXLD1370Q is an LED driver controller IC for driving external

MOSFETs to drive high-current LEDs. It is a multi-topology controller

that efficiently controls the current through series connected LEDs.

The multi-topology enables it to operate in buck, boost and buck-

boost configurations.

The 60V capability coupled with its multi-topology capability enables it

to be used in a wide range of applications and drive in excess of

15 LEDs in series.

The ZXLD1370Q is a modified hysteretic controller using a patent

pending control scheme providing high output current accuracy in all

three modes of operation. High accuracy dimming is achieved

through DC control and high frequency PWM control.

The ZXLD1370Q uses two pins for fault diagnosis. A flag output

highlights a fault, while the multilevel status pin gives further

information on the exact fault.

compliant supporting PPAP documents.

Pin Assignments

(Top View)

TSSOP-16EP

Features



0.5% Typical Output Current Accuracy



6V to 60V Operating Voltage Range



LED Driver Supports Buck, Boost and Buck-Boost Configurations



Wide Dynamic Range Dimming



20:1 DC Dimming



1000:1 Dimming Range at 500Hz



Up to 1MHz Switching



High Temperature Control of LED Current Using TADJ



Available in Thermally Enhanced TSSOP-16EP Package with

Green Molding Compound



Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)



Halogen and Antimony Free. “Green” Device (Note 3)



Automotive Compliant



Qualified to AEC-Q100 Grade 1 and TS16949 Certification



PPAP Capable (Note 4)

Notes:

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.

2. See https://www.diodes.com/quality/lead-

free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and

Lead-free.

3. Halogen- and Antimony-

free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.

4. Automotive products are AEC-Q101 qualified and are PPAP capable. Refer to https://www.diodes.com/quality/.

Typical Applications Circuit

VAUX

VIN

ISM

PWM

GI

ADJ

GATE

REF

FLAG

TADJ

STATUS

SHP

SGND PGND

L1

SD1

C1

C2

VIN 8V

to 18V

GND

R1

LED 1

to 4

TH1

10k

Thermally connected

33mH

0R1

4.7µF

100pF

RGI2

62k

51k

RGI1

2k

R4

Q1

DMN6068LK3

PSD3100

I LED = 1A

U1

ZXLD1370Q

4.7µF

Buck-Boost Diagram Utilizing Thermistor and TADJ