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MAX8795A

TFT-LCD DC-DC Converter with Operational Amplifiers

TFT LCD, DC-DC Converter with a High-Performance Step-Up Regulator, Two Linear-Regulator Controllers, and High-Current Operational Amplifiers for Active-Matrix, Thin-Film Transistor (TFT) LCDs

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The MAX8795A includes a high-performance step-up regulator, two linear-regulator controllers, and five high-current operational amplifiers for active-matrix, thin-film transistor (TFT), liquid-crystal displays (LCDs). Also included is a logic-controlled, high-voltage switch with adjustable delay.

The step-up DC-DC converter provides the regulated supply voltage for the panel source driver ICs. The converter is a high-frequency (1.2MHz) current-mode regulator with an integrated 20V n-channel MOSFET that allows the use of ultra-small inductors and ceramic capacitors. It provides fast transient response to pulsed loads while achieving efficiencies over 85%.

The gate-on and gate-off linear-regulator controllers provide regulated TFT gate-on and gate-off supplies using external charge pumps attached to the switching node. The MAX8795A includes five high-performance operational amplifiers. These amplifiers are designed to drive the LCD backplane (VCOM) and/or the gamma-correction divider string. The device features high output current (±130mA), fast slew rate (45V/µs), wide bandwidth (20MHz), and rail-to-rail inputs and outputs.

The MAX8795A is available in a lead-free, 32-pin, thin QFN package with a maximum thickness of 0.8mm for ultra-thin LCD panels, as well as in a 32-pin LQFP package with 0.8mm pin pitch.

Data Sheet

Download	Rev 4	(PDF, 644kB)
E-Mail

An evaluation kit is available: MAX8795AEVKIT

Key Features

2.5V to 5.5V Input Supply Range
1.2MHz Current-Mode Step-Up Regulator
- Fast Transient Response to Pulsed Load
- High-Accuracy Output Voltage (1%)
- Built-In 20V, 3A, 0.16Ω n-Channel MOSFET
- High Efficiency (85%)
Linear-Regulator Controllers for V_GON and V_GOFF
High-Performance Operational Amplifiers
- ±130mA Output Short-Circuit Current
- 45V/µs Slew Rate
- 20MHz, -3dB Bandwidth
- Rail-to-Rail Inputs/Outputs
Logic-Controlled, High-Voltage Switch with Adjustable Delay
Timer-Delay Fault Latch for All Regulator Outputs
Thermal-Overload Protection
0.6mA Quiescent Current

Applications/Uses

Automotive Displays
LCD Monitor Panels
Notebook Computer Displays

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)

Package/Pins

Smallest Available Pckg.
(mm²)

Budgetary Price

min

max

min

max

≥

≤

max w/pins

See Notes

MAX8795A

Step-Up

Output OVP

Shutdown

Current Limit

Fixed Freq./PWM

Internal Pwr. FETs

Soft Start

TFT Bias

VCOM Buffer

2.5

0.5

1200

LQFP/32

TQFN/32

$1.53 @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

Minimal Operating Circuit

Product Guides

Displays (PDF)

Reliability Reports

Reliability Report:	MAX8795A.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
MAX8795AETJ+			Active	TQFN;32 pin;26 mm² Outline Drawing:21-0140 (PDF) Land Pattern: 90-0001 (PDF) Use pkgcode/variation: T3255+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8795AETJ+C7P			Active	TQFN;32 pin;26 mm² Outline Drawing:21-0140 (PDF) Land Pattern: 90-0001 (PDF) Use pkgcode/variation: T3255+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8795AETJ+T			Active	TQFN;32 pin;26 mm² Outline Drawing:21-0140 (PDF) Land Pattern: 90-0001 (PDF) Use pkgcode/variation: T3255+3*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8795AGCJ+			Active	LQFP;32 pin;82.8 mm² Outline Drawing:21-0054 (PDF) Land Pattern: 90-0111 (PDF) Use pkgcode/variation: C32+2*	-40°C to +105°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8795AGCJ+T			Active	LQFP;32 pin;82.8 mm² Outline Drawing:21-0054 (PDF) Land Pattern: 90-0111 (PDF) Use pkgcode/variation: C32+2*	-40°C to +105°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8795AGCJ/V+			Active	LQFP;32 pin;82.8 mm² Outline Drawing:21-0054 (PDF) Land Pattern: 90-0111 (PDF) Use pkgcode/variation: C32+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8795AGCJ/V+T			Active	LQFP;32 pin;82.8 mm² Outline Drawing:21-0054 (PDF) Land Pattern: 90-0111 (PDF) Use pkgcode/variation: C32+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8795AGTJ+			Active	TQFN;32 pin;26 mm² Outline Drawing:21-0140 (PDF) Land Pattern: 90-0001 (PDF) Use pkgcode/variation: T3255+3*	-40°C to +105°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8795AGTJ+T			Active	TQFN;32 pin;26 mm² Outline Drawing:21-0140 (PDF) Land Pattern: 90-0001 (PDF) Use pkgcode/variation: T3255+3*	-40°C to +105°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8795AGTJ/V+			Active	TQFN;32 pin;26 mm² Outline Drawing:21-0140 (PDF) Land Pattern: 90-0001 (PDF) Use pkgcode/variation: T3255+3*	-40°C to +105°C	RoHS/Lead-Free: Lead Free Materials Analysis
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX8795AGTJ/V+T			Active	TQFN;32 pin;26 mm² Outline Drawing:21-0140 (PDF) Land Pattern: 90-0001 (PDF) Use pkgcode/variation: T3255+3*	-40°C to +105°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.
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

MAX8795AEVKIT

MAX8795A Evaluation Kit

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