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MAXREFDES1003: 150mA, 4-Channel LED Driver in SEPIC Configuration

MAXREFDES1003

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Description

The MAX16813 is a highly efficient, high-brightness (HB) LED driver that provides four integrated LED current-sink channels. An integrated current-mode switching controller drives a DC-DC converter that provides the necessary voltage to multiple strings of HB LEDs. The device accepts a wide 4.75V to 40V input voltage range and withstands direct automotive load-dump events. The wide input range allows powering HB LEDs for small- to medium-sized LCD displays in automotive and general lighting applications. 

An internal current-mode switching DC-DC controller supports boost or single-ended primary inductor converter (SEPIC) topologies and operates in an adjustable frequency range between 200kHz and 2MHz. An integrated spread-spectrum mode helps reduce EMI. Current-mode control with programmable slope compensation provides fast response and simplifies loop compensation. An adaptive output-voltage control scheme minimizes power dissipation in the LED current-sink paths. The device has a separate p-channel drive (PGATE) pin that is used for output undervoltage protection. Whenever the output falls below the threshold, the external p-MOSFET is latched off, disconnecting the input source. Cycling the EN or the input supply is required to restart the converter. 

The device consists of four identical linear current-sink channels, adjustable from 20mA to 150mA with an accuracy of ±3% using a single external resistor. Multiple channels can be connected in parallel to achieve higher current per LED string. The device also features a unique pulsed dimming control through a logic input (DIM), with minimum pulse width as low as 500ns. Protection features include output overvoltage, open-LED detection and protection, programmable shorted LED detection and protection, output undervoltage protection and detection, and overtemperature protection.

An LED driver in a SEPIC configuration using the MAX16813 is demonstrated for a 24V, 600mA output application. The device can drive up to 4 channels at once. 

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Designed, Built, Tested

Board pictured here has been fully assembled and tested. Not available for sale.

 

Schematic

PCB Layout

Parametrics

Input Type Vin(Min) Vin(Max) Iout(Max) Single/Multiple Output Vout(V) Pout(W) Isolated/Non-Isolated Topology
DC 8 32 0.6 - 19 14 Non-Isolated Sepic

Parametrics

Input Type DC
Vin(Min) 8
Vin(Max) 32
Iout(Max) 0.6
Single/Multiple Output -
Vout(V) 19
Pout(W) 14
Isolated/Non-Isolated Non-Isolated
Topology Sepic

Maxim Devices (1)

Part Number Name Product Family Order Design kits and evaluation modules
MAX16813 Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller and Battery Disconnect LED Driver - LED Driver ICs Buy Now Design Kits

Maxim Devices (1)

Part Number Product Family
LED Driver - LED Driver ICs
Integrated, 4-Channel, High-Brightness LED Driver with High-Voltage DC-DC Controller and Battery Disconnect

Design Files (3)

Title Type Size Date
maxrefdes1003-pcb PDF 2MB 2019-07-09
maxrefdes1003-schematics PDF 31KB 2019-07-09
MAXREFDES1003_MAX16813_BOM PDF 351KB 2019-07-09
Date Type
2019-07-09

maxrefdes1003-pcb

(PDF, 2MB)

2019-07-09

maxrefdes1003-schematics

(PDF, 31KB)

2019-07-09

MAXREFDES1003_MAX16813_BOM

(PDF, 351KB)

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