MAX16840 Maxim Integrated Products, MAX16840 Datasheet

MAX16840

Manufacturer Part Number

MAX16840

Description

LED Driver

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX16840.pdf (1 pages)

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19-5671; Rev 0; 12/10

The MAX16840 is an LED driver IC for lighting applica-

tions. It includes all the necessary features to design low-

component-count LED drivers for 12V AC and 24V AC

input (e.g., MR16) light bulbs. A proprietary input-current

control scheme allows LED lamps based on this device

to be compatible with electronic transformers, and

dimmable with standard trailing-edge dimmers (where

electronic transformers are present) or leading-edge

dimmers (where magnetic transformers are present).

The IC can be used in buck, boost, and buck-boost

topologies. It has an integrated 0.2I (max), 48V switching

MOSFET that allows for output power levels up to 10W.

The IC uses constant-frequency average current-mode

control. It senses the input current through the voltage

at the FB pin, and regulates its average. An input pin

(REFI) allows the setting of the input-current level. When

the voltage at this pin is set below a certain threshold, the

input current is proportional to this voltage, while when

that voltage is beyond the threshold, the input current is

set at a fixed, predefined level. This nonlinear behavior

of REFI allows its use to achieve thermal foldback, by

connecting it to an NTC resistor.

The IC also features an internal overvoltage protection on

the IN pin to protect the internal switching MOSFET from

damage if the LED string is open or if the voltage on the

LED string is too high.

The IC has a separate EXT pin that can be used to guar-

antee that there is a kick-start of current at turn-on for

low-input voltages for proper operation with electronic

transformers. EXT drives an external npn transistor.

Once the UVLO threshold of 5.5V is crossed on IN, EXT

is pulled to ground and the external npn transistor is

turned off.

The IC is available in a 3mm x 3mm, 10-pin TDFN power

package, and is rated over the 0NC to +125NC operating

temperature range.

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.

MR16 and Other 12V AC or DC Input LED

Lighting Applications

for MR16 and Other 12V AC Input Lamps

_______________________________________________________________ Maxim Integrated Products 1

General Description

LED Driver with Integrated MOSFET

Applications

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

*EP = Exposed pad.

MAX16840ATB+

12V AC

Control of the Average Input Current to Achieve

Operation with Electronic Transformers and

Dimmability

Buck, Boost, SEPIC, and Buck-Boost Topologies

Integrated 0.2I (max) 48V Switching MOSFET

Analog Dimming and Thermal Foldback

External npn Driver to Guarantee Minimum Load

to Electronic Transformer at Startup

Output Overvoltage Protection

Internal Overtemperature Protection

0°C to +125°C Operating Temperature Range

3mm x 3mm, 10-Pin TDFN Package

PART

BD1

Typical Operating Circuit

TEMP RANGE

0NC to +125NC

Ordering Information

REFI

EXT

COMP

MAX16840

DRAIN

GND

PIN-PACKAGE

SOURCE

www.DataSheet4U.com

10 TDFN-EP*

Features

LED-

LED+

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