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Status

Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 184kB) Download   E-Mail

Description

The MAX16834 is a current-mode high-brightness LED (HB LED) driver for boost, buck-boost, SEPIC, and high-side buck topologies. In addition to driving an n-channel power MOSFET switch controlled by the switching controller, it also drives an n-channel PWM dimming switch to achieve LED PWM dimming. The MAX16834 integrates all the building blocks necessary to implement a fixed-frequency HB LED driver with wide-range dimming control. The MAX16834 features constant-frequency peak current-mode control with programmable slope compensation to control the duty cycle of the PWM controller. A dimming driver designed to drive an external n-channel MOSFET in series with the LED string provides wide-range dimming control up to 20kHz. In addition to PWM dimming, the MAX16834 provides analog dimming using a DC input at REFI. The programmable switching frequency (100kHz to 1MHz) allows design optimization for efficiency and board space reduction. A single resistor from RT/SYNC to ground sets the switching frequency from 100kHz to 1MHz while an external clock signal at RT/SYNC disables the internal oscillator and allows the MAX16834 to synchronize to an external clock. The MAX16834's integrated high-side current-sense amplifier eliminates the need for a separate high-side LED current-sense amplifier in buck-boost applications. The MAX16834 operates over a wide supply range of 4.75V to 28V and includes a 3A sink/source gate driver for driving a power MOSFET in high-power LED driver applications. It can also operate at input voltages greater than 28V in boost configuration with an external voltage clamp. The MAX16834 is also suitable for DC-DC converter applications such as boost or buck-boost. Additional features include external enable/disable input, an on-chip oscillator, fault indicator output (active-low FLT) for LED open/short or overtemperature conditions, and an overvoltage protection sense input (OVP+) for true overvoltage protection. The MAX16834 is available in a thermally enhanced 4mm x 4mm, 20-pin TQFN-EP package and in a thermally enhanced 20-pin TSSOP-EP package and is specified over the automotive -40°C to +125°C temperature range.

An evaluation kit is available:  MAX16834EVKIT  

Key Features		Applications/Uses
Wide Input Operating Voltage Range (4.75V to 28V) Works for Input Voltage > 28V with External Voltage Clamp on VIN for Boost Converter 3000:1 PWM Dimming/Analog Dimming Integrated PWM Dimming MOSFET Driver Integrated High-Side Current-Sense Amplifier for LED Current Sense in Buck-Boost Converter 100kHz to 1MHz Programmable High-Frequency Operation External Clock Synchronization Input Programmable UVLO Internal 7V Low-Dropout Regulator Fault Output (active-low FLT) for Overvoltage, Overcurrent, and Thermal Warning Faults Programmable True Differential Overvoltage Protection 20-Pin TQFN-EP and TSSOP Packages		Architectural and Decorative Lighting (MR16, MR111) Automotive Rear and Front Lighting DC-DC Boost/Buck-Boost Converters Projection System RGB LED Light Sources Single-String LED LCD Backlighting Spot and Ambient Lights

Key Specifications:  High Brightness LED Drivers

Part Number

Topology

VIN (V)

VIN (V)

Extended VIN with External Bias

LED Channels

ILED per Channel (A)

LED String Volt.

Internal Pwr. MOSFETs

Freq.

PWM Dimming Freq. (kHz)

PWM Dimming Ratio

EV Kit

Price

min

max

max

max

max

max

See Notes

MAX16834

Boost Buck Buck-Boost Inductor Based

4.75

28

Yes

1 1

10

Set externally

No

100kHz to 1MHz

20

1:3000

Yes

$1.24 @1k

See All High Brightness LED Drivers (26)

Key Specifications:  White LED Drivers

Part Number

Topology

LEDs

Config.

Dimming Control

VCURR_SENSE (mV)

POUT (W)

ILED (mA)

VIN (V)

VIN (V)

ICC (mA)

VOUT (V)

Oper. Freq. (kHz)

Package/Pins

Price

max num. of

max

min

max

max

max

See Notes

MAX16834

Boost Buck Buck-Boost Inductor Based

100

Series Series-Parallel

Analog PWM

200

50

1500

4.75

28

10

100

1000

TQFN/20 TSSOP-EP/20

$1.24 @1k

See All White LED Drivers (46)

Diagram

Typical Operating Circuit

Application Notes

Application Note 4452: Designing a Buck-Boost LED Driver Using the MAX16834 - MAX16834

Evaluation Kits

MAX16834EVKIT

Design Guides

Displays (PDF) Automotive (PDF)

Reliability Reports

Reliability Report: MAX16834.pdf Show FIT data for: MAX16834

Software/Models

none

Ordering Information

Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-8 of 8

MAX16834	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX16834ATP+T			Active	TQFN;20 pin;17 mm² Outline Drawing: 21-0139 (PDF) Land Pattern: 90-0037 (PDF) Use pkgcode/variation: T2044+3*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX16834ATP+			Active	TQFN;20 pin;17 mm² Outline Drawing: 21-0139 (PDF) Land Pattern: 90-0037 (PDF) Use pkgcode/variation: T2044+3*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX16834ATP/V+			Active	TQFN;20 pin;17 mm² Outline Drawing: 21-0139 (PDF) Land Pattern: 90-0037 (PDF) Use pkgcode/variation: T2044+3*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX16834ATP/V+T			Active	TQFN;20 pin;17 mm² Outline Drawing: 21-0139 (PDF) Land Pattern: 90-0037 (PDF) Use pkgcode/variation: T2044+3*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX16834AUP+T			Active	Land Pattern: Not Available	-40°C to +125°C	See data sheet
MAX16834AUP+			Active	TSSOP-EP;20 pin;43 mm² Outline Drawing: 21-0108 (PDF) Land Pattern: 90-0114 (PDF) Use pkgcode/variation: U20E+1*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX16834AUP/V+			Active	TSSOP-EP;20 pin;43 mm² Outline Drawing: 21-0108 (PDF) Land Pattern: 90-0114 (PDF) Use pkgcode/variation: U20E+1*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX16834AUP/V+T			Active	Land Pattern: Not Available	-40°C to +125°C	See data sheet

More Information

Topmark Coding: MAX16834 New Product Press Release 2008-12-17

Related Products

MAX16831 High-Voltage, High-Power LED Driver with Analog and PWM Dimming Control MAX16826 Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection MAX16819, MAX16820 2MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming MAX16832A, MAX16832C 2MHz, High-Brightness LED Drivers with Integrated MOSFET and High-Side Current Sense MAX16821, MAX16821A, MAX16821B, MAX16821C High-Power Synchronous HB LED Drivers with Rapid Current Pulsing More Like This: View Product Families for Similar Products See All High Brightness LED Drivers (26 Products) See All White LED Drivers (46 Products)

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Description   Key Features   Applications/Uses   Key Specifications   Diagram

Data Sheet   Application Notes   Design Guides   Engineering Journals   Reliability Reports   Software/Models   Evaluation Kits

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Document Ref.: 19-4235; Rev 2; 2009-09-08
This page last modified: 2009-09-08