Low-Cost Multiple-Output Power Supply for LCD TVs

Multiple-Output Power-Supply Controller Generates All the Supply Rails for TFT-LCD TV Applications

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The MAX17014 multiple-output power-supply controller generates all the supply rails for thin-film transistor (TFT) liquid-crystal display (LCD) panels in TVs and monitors operating from a regulated 12V input. It includes a step-down and a step-up regulator, a positive and a negative charge pump, two operational amplifiers, and a Dual Mode™ logic-controlled high-voltage switch control block. The MAX17014 can operate from 8V to 16.5V input voltages and is optimized for LCD TV panel and LCD monitor applications running directly from 12V supplies.

The step-up and step-down regulators feature internal power MOSFETs and high-frequency operation allowing the use of small inductors and capacitors, resulting in a compact solution. Both switching regulators use fixed-frequency current-mode control architectures, providing fast load-transient response and easy compensation. A current-limit function for internal switches and output-fault shutdown protect the step-up and step-down power supplies against fault conditions. The MAX17014 provides soft-start functions to limit inrush current during startup. The MAX17014 provides adjustable power-up timing.

The positive and negative charge-pump regulators provide TFT gate driver supply voltages. Both output voltages can be adjusted with external resistive voltage-dividers. The switch control block allows the manipulation of the positive TFT gate driver voltage.

The MAX17014 includes two high-current operational amplifiers designed to drive the LCD backplane (VCOM). The amplifier features high output current (±150mA), fast slew rate (100V/µs), wide bandwidth (20MHz), and rail-to-rail inputs and outputs. A series p-channel MOSFET is integrated to sequence power to AV_DD after the MAX17014 has proceeded through normal startup, and provides True Shutdown™.

The MAX17014 is available in a small (7mm x 7mm), low-profile (0.8mm), 48-pin thin QFN package and operates over a -40°C to +85°C temperature range.

Data Sheet

Download	Rev 1	(PDF, 540kB)
E-Mail

An evaluation kit is available: MAX17014EVKIT

Key Features

Optimized for 10.8V to 13.2V Input Supply
8V to 16.5V Input Supply Range
Selectable Frequency (600kHz/1.2MHz)
Current-Mode Step-Up Regulator
- Built-In 20V, 3.3A, 110mΩ n-Channel MOSFET
- High-Accuracy Output Voltage (1%)
- True Shutdown
- Fast Load-Transient Response
- High Efficiency
- 3ms Internal Soft-Start
Current-Mode Step-Down Regulator
- Built-In 20V, 2.5A, 120mΩ n-Channel MOSFET
- Fast Load-Transient Response
- Adjustable Output Voltage Down to 1.25V
- Skip Mode at Light Load
- High Efficiency
- 3ms Internal Soft-Start
Adjustable Positive and Negative Charge-Pump Regulators
Soft-Start and Timer-Delay Fault Latch for All Outputs
Logic-Controlled High-Voltage Integrated Switches with Adjustable Delay
Two High-Speed Operational Amplifiers
- ±150mA Short-Circuit Current
- 100V/µs Slew Rate
- 20MHz, -3dB Bandwidth
120mΩ p-Channel FET for AV_DD Sequencing
Input Undervoltage Lockout and Thermal-Overload Protection
48-Pin, 7mm x 7mm Thin QFN Package

Applications/Uses

LCD Monitor Panels
LCD TV Panels

Diagram

Simplified Operating Circuit

Product Guides

Displays (PDF)

Reliability Reports

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Ordering Information

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Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX17014ETM+			Active	TQFN;48 pin;50.4 mm² Outline Drawing:21-0144 (PDF) Land Pattern: 90-0129 (PDF) Use pkgcode/variation: T4877+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX17014ETM+T			Active	TQFN;48 pin;50.4 mm² Outline Drawing:21-0144 (PDF) Land Pattern: 90-0129 (PDF) Use pkgcode/variation: T4877+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
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Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product 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.