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Integrated, 4-Channel, High-Brightness LED

Driver with High-Voltage DC-DC Controller

General Description

The MAX16814 high-efficiency, high-brightness LED (HB

LED) driver provides up to four integrated LED current-

sink channels. An integrated current-mode switching

DC-DC controller drives a DC-DC converter that pro-

vides the necessary voltage to multiple strings of HB

LEDs. The MAX16814 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 automo-

tive and general lighting applications.

An internal current-mode switching DC-DC controller

supports the boost, coupled-inductor boost-buck, or

SEPIC topologies and operates in an adjustable fre-

quency range between 200kHz and 2MHz. It can also be

used for single-inductor boost-buck topology in conjunc-

tion with the MAX15054 and an additional MOSFET. The

current-mode control with programmable slope com-

pensation provides fast response and simplifies loop

compensation. The MAX16814 also features an adaptive

output-voltage control scheme that minimizes the power

dissipation in the LED current-sink paths.

The MAX16814 consists of four identical linear current

source channels to drive four strings of HB LEDs. The

channel current is adjustable from 20mA to 150mA with

an accuracy of ±3% using an external resistor. The

external resistor sets all 4-channel currents to the same

value. The device allows connecting multiple channels

in parallel to achieve higher current per LED string. The

MAX16814 also features pulsed dimming control, on all

four channels through a logic input (DIM). In addition,the

MAX16814A_ _ and MAX16814U_ _ include a unique

feature that allows a very short minimum pulse width as

low as 1µs.

The MAX16814 includes an output overvoltage, open-

LED detection and protection, programmable shorted

LED detection and protection, and overtemperature pro-

tection. The device operates over the -40NC to +125NC

automotive temperature range. The MAX16814 is avail-

able in the 6.5mm x 4.4mm, 20-pin TSSOP and 4mm x

4mm, 20-pin TQFN packages.

Applications

Automotive Displays LED Backlights

Automotive RCL, DRL, Front Position, and Fog

Lights

LCD TV and Desktop Display LED Backlights

Architectural, Industrial, and Ambient Lighting

Features

S

4-Channel Linear LED Current Sinks with Internal

MOSFETs

Full-Scale LED Current Adjustable from 20mA

to 150mA

Drives One to Four LED Strings

S

Boost, SEPIC, or Coupled-Inductor Boost-Buck

Current-Mode DC-DC Controller

200kHz to 2MHz Programmable Switching

Frequency

External Switching Frequency Synchronization

S

Adaptive Output-Voltage Optimization to Minimize

Power Dissipation

S

4.75V to 40V Operating Input Voltage Range

S

Less than 40µA Shutdown Current

S

5000:1 PWM Dimming at 200Hz (MAX16814A _ _

and MAX16814U_ _ Only)

S

Open-Drain Fault Indicator Output

S

Open-LED and LED Short Detection and

Protection

S

Overtemperature Protection

S

Thermally Enhanced, 20-Pin TQFN and TSSOP

Packages

Typical Operating Circuit and Pin Configurations appear at

end of data sheet.

19-4722; Rev 2; 11/09

EVALUATION

KIT

AVAILABLE

Ordering Information

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

/V Denotes an automotive qualified part.

PART

TEMP RANGE

PIN-PACKAGE

MAX16814ATP+

-40

°C to +125°C

20 TQFN-EP*

MAX16814ATP/V+

-40

°C to +125°C

20 TQFN-EP*

MAX16814AUP+

-40

°C to +125°C

20 TSSOP-EP*

MAX16814BUTP+

0

°C to +85°C

20 TQFN-EP*

MAX16814BUUP+

0

°C to +85°C

20 TSSOP-EP*

MAX16814UTP+

0

°C to +85°C

20 TQFN-EP*

MAX16814UUP+

0

°C to +85°C

20 TSSOP-EP*