MAX8795A TFT-LCD DC-DC Converter with Operational Amplifiers

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.

Key Features

Applications/Uses

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

	Automotive Displays
	LCD Monitor Panels
	Notebook Computer Displays

Key Specifications: Multifunction PMICs

Part Number

PMIC for:

Primary Topology

Monitor/Control Features

DC-DC/Power Features

LCD/LED/Flash/CCD Features

V_IN (min) (V)

V_IN (max) (V)

Min. V_OUT (V)

Max. V_OUT (V)

I_OUT (A)

Operating Freq. (kHz)

Number of Step-Up Outputs

Number of LDO Outputs

Number of Op Amp Outputs

Output Adj. Method

Operating Current, I_CC (max) (mA)

EV-Kit

Industry Qualified

Package

RoHS Available

Operating Temp. Range (°C)

Price^**

MAX8795A

LCD

Step-Up

Output Overvoltage Protection
Shutdown

Current Limit
Fixed Frequency/PWM
Internal Power Switches
Soft Start

TFT Bias
VCOM Buffer

2.5

0.5

1200

Resistor

Automotive - General

THIN QFN/32

Yes

-40 to +85

$3.90 @ 1k

See All Multifunction PMICs (71)

Key Specifications: Switch-Mode DC-DC Power Supplies

Part Number

Topology

V_IN (min) (V)

V_IN (max) (V)

Number of DC-DC Outputs

Digital/VID Programmed Output

Min. Adjustable V_OUT (V)

Max. Adjustable V_OUT (V)

I_OUT (A)

Operating Current, I_CC (max) (mA)

Operating Freq. (kHz)

Internal Power Switch(es)

Industry Qualified

Package

Price^**

MAX8795A

Step-Up

2.5

0.5

1200

Yes

Automotive - General

THIN QFN/32

$3.90 @ 1k

See All Switch-Mode DC-DC Power Supplies (429)

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.

Ordering Information

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. 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: 1-3 of 3

MAX8795A

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX8795AETJ+T

THIN QFN;32 pin;
Dwg: 21-0140L (PDF)
Use pkgcode/variation: T3255+3*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX8795AETJ+

THIN QFN;32 pin;
Dwg: 21-0140L (PDF)
Use pkgcode/variation: T3255+3*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX8795AETJ+C7P

THIN QFN;32 pin;
Dwg: 21-0140L (PDF)
Use pkgcode/variation: T3255+3*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis