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MAX16840

LED Driver with Integrated MOSFET for MR16 and Other 12V AC Input Lamps

Unique Solution Allows MR16 LED Lamps to Be Compatible with Most Electronic Transformers and is Dimmable Flicker-Free

Overview

Status

Part Number	Status
MAX16840	Active: In Production. See Ordering Information for details.

Description

The MAX16840 is an LED driver IC for lighting applications. 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).

The IC can be used in buck, boost, and buck-boost topologies and features. It has an integrated 0.2Ω (max), 48V switching MOSFET.

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 guarantee 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 -40°C to +125°C operating temperature range.

Introduction to the MAX16840 LED driver.

Data Sheet

Download	Rev 3	(PDF, 807.2kB)
Email

An evaluation kit is available: MAX16840EVKIT MAX16840LEVKIT

NOTE: This product uses the following:
MAX16840 EVKIT Software
MAX16840L EVKIT Software

Key Features

Control of the Average Input Current to Achieve Operation with Electronic Transformers and Dimmability
Buck, Boost, SEPIC, and Buck-Boost Topologies
Integrated 0.2Ω (max) 48V Switching MOSFET
Analog Dimming and Thermal Foldback
Output Overvoltage Protection
Internal Overtemperature Protection
-40°C to +125°C Operating Temperature Range
3mm x 3mm, 10-Pin TDFN Package

Applications/Uses

MR16 and Other 12V AC or DC Input LED Lighting Applications

Key Specifications:

LED Drivers

Part Number

Regulation Topology

Max. No. of LEDs

LED Channels

LED Configuration

I_LED per Channel
(A)

Dimming Ratio

Dimming Control

V_{CURR_SENSE}
(mV)

P_OUT
(W)

V_IN
(V)

I_CC
(mA)

LED String Volt.
(V)

Oper. Freq.
(kHz)

Budgetary
Price

max

min

max

See Notes

MAX16840

Inductor Based

Series

1000

Analog

200

6.5

300

$3.51 @1k

See All LED Drivers (75)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

Typical Operating Circuit

More Information

Topmark Coding	MAX16840
New Product Press Release	[ 2011-01-24 ]

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Information Index

Overview		Design Resources		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Technical Documents Evaluation Kits Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Document Ref.: 19-5671 Rev 3; 2011-08-17
This page last modified: 2011-11-28