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MAX8728

Low-Cost Multiple-Output Power Supply for LCD Monitors/TVs

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The MAX8728 generates all the supply rails for thin-film transistor (TFT) liquid-crystal display (LCD) panels in TVs and monitors. It includes step-down and step-up regulators, positive and negative charge pumps, and a dual-mode, logic-controlled, high-voltage switch control block. The MAX8728 can operate from input voltages from 7V to 13.2V 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. 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 MAX8728 is available in a small (5mm x 5mm), low-profile (0.8mm), 32-pin thin QFN package and operates over the -40°C to +85°C temperature range.

Data Sheet

Download	Rev 0	(PDF, 956kB)
E-Mail

An evaluation kit is available: MAX8728EVKIT

Key Features

Optimized for 10.8V to 13.2V Input Supply
7V to 13.2V Input Supply Range
Selectable Frequency (500kHz/1MHz/1.5MHz)
Current-Mode Step-Down Regulator
- 14V Internal n-Channel MOSFET
- 1.5% Accurate Output
Current-Mode Step-Up Regulator
- 15V Internal n-Channel MOSFET
- 1% Accurate Output
- True Shutdown (Output Goes to Zero)
180° Out-of-Phase Switching
Adjustable Positive/Negative Charge Pumps
Soft-Start and Timer Delay Fault Latch for All Outputs
Logic-Controlled, High-Voltage Switches
Power-Up and Power-Down Sequences
Thermal-Overload Protection

Applications/Uses

LCD Monitors
LCD TVs

Key Specifications:

Multifunction PMICs

Part Number

Primary Topology

Monitor/Control Features

DC-DC/Power Features

LCD/LED/Flash/CCD Features

V_IN
(V)

V_OUT
(V)

Max. I_OUT
(A)

Oper. Freq.
(kHz)

Inverting Outputs

Package/Pins

Smallest Available Pckg.
(mm²)

Budgetary Price

min

max

min

max

≥

≤

max w/pins

See Notes

MAX8728

Step-Down

Shutdown

Adj. Frequency

Current Limit

Dual/ Multi-Phase

Fixed Freq./PWM

Internal Pwr. FETs

Soft Start

TFT Bias

13.2

1500

TQFN/32

$1.79 @1k

See All Multifunction PMICs (96)

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

Simplified Operating Circuit

Reliability Reports

Reliability Report:	MAX8728.pdf
Show FIT data for:

Software/Models

none

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX8728ETJ			Active	TQFN;32 pin;26 mm² Outline Drawing:21-0140 (PDF) Land Pattern: 90-0012 (PDF) Use pkgcode/variation: T3255-4*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX8728ETJ+			Active	TQFN;32 pin;26 mm² Outline Drawing:21-0140 (PDF) Land Pattern: 90-0012 (PDF) Use pkgcode/variation: T3255+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8728ETJ+T			Active	TQFN;32 pin;26 mm² Outline Drawing:21-0140 (PDF) Land Pattern: 90-0012 (PDF) Use pkgcode/variation: T3255+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8728ETJ-T			Active	QFN;32 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet

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; -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.

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Evaluation Kits

MAX8728EVKIT

MAX8728 Evaluation Kit

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