General Description

The MAX16832A/MAX16832C step-down constant-cur-

rent high-brightness LED (HB LED) drivers provide a

cost-effective design solution for automotive

interior/exterior lighting, architectural and ambient light-

ing, LED bulbs, and other LED illumination applications.

The MAX16832A/MAX16832C operate from a +6.5V to

+65V input voltage range and can provide an output

current up to 700mA, if operated up to a temperature of

+125°C, or up to a 1A if operated up to a temperature

of +105°C. A high-side current-sense resistor adjusts

the output current, and a dedicated pulse-width modu-

lation (PWM) input enables pulsed LED dimming over a

wide range of brightness levels.

These devices are well suited for applications requiring

a wide input voltage range. The high-side current sens-

ing and an integrated current-setting circuitry minimize

the number of external components while delivering an

average output current with ±3% accuracy. A hysteretic

control method ensures excellent input supply rejection

and fast response during load transients and PWM dim-

ming. The MAX16832A allows 10% current ripple, and

the MAX16832C allows 30% current ripple. Both

devices operate up to a 2MHz switching frequency,

thus allowing the use of small-sized components.

The MAX16832A/MAX16832C offer an analog dimming

feature that reduces the output current by applying an

external DC voltage below the internal 2V threshold volt-

age from TEMP_I to GND. TEMP_I also sources 25µA to

a negative temperature coefficient (NTC) thermistor con-

nected between TEMP_I and GND, thus providing an

analog thermal-foldback feature that reduces the LED

current when the temperature of the LED string exceeds

a specified temperature point. Additional features

include thermal-shutdown protection.

The MAX16832A/MAX16832C operate over the -40°C to

+125°C automotive temperature range and are available

in a thermally enhanced 8-pin SO package.

Applications

Architectural, Industrial, and Ambient Lighting

Automotive RCL, DRL, and Fog Lights

Heads-Up Displays

Indicator and Emergency Lighting

MR16 and MR111 LED Lights

Features

o High-Efficiency Solution

o 6.5V to 65V Input Voltage Range

o Output Current Up to 1A

o On-Board 65V, 0.45Ω Power MOSFET

o Hysteretic Control: Up to 2MHz Switching

Frequency

o ±3% LED Current Accuracy

o 200mV Current-Sense Reference

o Resistor-Programmable Constant LED Current

o Integrated High-Side Current Sense

o Thermal-Foldback Protection/Linear Dimming

o Thermal-Shutdown Protection

o Available in a Thermally Enhanced 8-Pin SO

Package

o -40°C to +125°C Operating Temperature Range

2MHz, High-Brightness LED Drivers with

Integrated MOSFET and High-Side Current Sense

Ordering Information

LX

LX

PGND

1

2

8

7

TEMP_I

DIM

IN

GND

CS

3

4

6

5

MAX16832A

MAX16832C

L1

C2

ON

OFF

D1

HB LEDs

NTC*

*OPTIONAL

C1

Typical Application Circuit

19-4140; Rev 6; 7/12

1

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

EVALUATION

KIT

AVAILABLE

+

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

*

EP = Exposed pad.

/V denotes an automotive qualified part.

PART

TEMP RANGE

PIN-PACKAGE

MAX16832AASA+

-40°C to +125°C

8 SO-EP*

MAX16832AASA/V+

-40°C to +125°C

8 SO-EP*

MAX16832CASA+

-40°C to +125°C

8 SO-EP*

Pin Configuration appears at end of data sheet.