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Status

Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 340kB) Download   E-Mail

Description

The MAX1739/MAX1839 fully integrated controllers are optimized to drive cold-cathode fluorescent lamps (CCFLs) using the industry-proven Royer oscillator inverter architecture. The Royer architecture provides near sinusoidal drive waveforms over the entire input range to maximize the life of CCFLs. The MAX1739/MAX1839 optimize this architecture to work over a wide input voltage range, achieve high efficiency, and maximize the dimming range. The MAX1739/MAX1839 monitor and limit the transformer center-tap voltage when required. This ensures minimal voltage stress on the transformer, which increases the operating life of the transformer and eases its design requirements. These controllers also provide protection against many other fault conditions, including lamp-out and buck short faults. These controllers achieve 50:1 dimming range by simultaneously adjusting lamp current and "chopping" the CCFL on and off using a digitally adjusted pulse-width modulated (DPWM) method. CCFL brightness is controlled by an analog voltage or is set with an SMBus™-compatible two-wire interface (MAX1739). The MAX1739/MAX1839 drive an external high-side N-channel power MOSFET and two low-side N-channel power MOSFETs, all synchronized to the Royer oscillator. An internal 5.3V linear regulator powers the MOSFET drivers and most of the internal circuitry. The MAX1739/MAX1839 are available in space-saving 20-pin QSOP packages and operate over the -40°C to +85°C temperature range.

An evaluation kit is available:  MAX1739EVKIT, MAX1739EVSYS  

Key Features		Applications/Uses
Fast Response to Input Change Wide Input Voltage Range (4.6V to 28V) High Power-to-Light Efficiency Minimizes Transformer Voltage Stress Lamp-Out Protection with 2s Timeout Buck Switch Short and Other Single-Point Fault Protection Integrated Royer MOSFET Drivers Reduce Transformer Pin Count Buck Operation Synchronized to Royer Oscillator Synchronizable DPWM Frequency Pin-Selectable Brightness Control Interface SMBus Serial Interface (MAX1739) Analog Interface (MAX1739/MAX1839)		LCD Displays Palmtop Computers

Diagram

Functional Diagram

Evaluation Kits

MAX1739EVKIT, MAX1739EVSYS

Reliability Reports

Show FIT data for: MAX1739 MAX1839 Request Reliability Report for: MAX1739 MAX1839

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: 1-6 of 6

MAX1739	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1739EEP+			Active	QSOP;20 pin;54.2 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0168 (PDF) Use pkgcode/variation: E20+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1739EEP+T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1739EEP			Active	QSOP;20 pin;54.2 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0168 (PDF) Use pkgcode/variation: E20-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1739EEP-T			Active	QSOP;20 pin;54.2 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0168 (PDF) Use pkgcode/variation: E20-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1839	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1839EEP			Active	QSOP;20 pin;54.2 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0168 (PDF) Use pkgcode/variation: E20-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1839EEP-T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet

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