Skip to main content
ZLED7720 - Application Circuit
ZLED7720 - Block Diagram
ZLED7720 - Pinout


High Current 40V LED Driver with Internal Switch

The ZLED7720 continuous-mode inductive step-down converter is part of our ZLED7x20 family of LED-control ICs. It is designed for applications requiring high brightness and high current. It can efficiently drive a single LED or multiple series-connected LEDs from a voltage input higher than the LED forward voltage: Vin = 6 to 40 VDC. It provides an adjustable output current ≤0.35A, which is set via an external resistor and controlled by the ZLED7720's integrated high-side output current-sensing circuit and high-speed internal 40V power switch. An external control signal on the ADJ pin, which can be a DC voltage, PWM, or microcontroller-generated waveform, can also be used to linearly adjust a continuous output current or to control a gated output current. The output can be turned off by applying a voltage lower than 0.2V to the ADJ pin, which puts the ZLED7720 in a low-current standby state. The ZLED7720 enables diverse industrial and consumer lighting applications requiring high driving currents, wide operating voltage range, high efficiency, and variable brightness control. It offers over-temperature and LED open-circuit protection. The ZLED7720 can also minimize bill-of-material costs because very few external components are required for most applications. Only a resistor, a diode, an inductor, and three capacitors are needed for a typical basic application.


  • Up to 0.35A output current
  • Internal 40V power switch
  • Wide DC input voltage range: 6 to 40 VDC
  • Output current accuracy: 3% (typical)
  • Dimming ratio: 1200:1
  • LED open-circuit protection
  • Thermal shutdown protection

Product Specification

ArchitectureInput Voltage Range (V)Output Current Max (A)Channels (#)Advanced Features
Buck6.00 - 40.000.351DC Dimming, PWM Dimming

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. RangeCarrier TypeSample & Buy
ZLED7720ZI1RActiveNTG5VFQFPN5-40 to 85°CReelCheck Availability


Technical Documentation

Title Type Format File Size Datesort icon
Datasheets & Errata
ZLED7x20 Short-form Datasheet Short Form Datasheet PDF 78 KB Apr 20, 2016
ZLED7x20 Datasheet Datasheet PDF 549 KB Apr 20, 2016
Apps Notes & White Papers
ZLED7000 / ZLED7020 Application Note - Buck Converter LED Driver Applications Application Note PDF 138 KB Apr 21, 2016
IDT CAD Altium Libraries for AID Products Rev 20160819 PCB Design Files ZIP 1.20 MB Aug 19, 2016

Evaluation Boards