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MAX1778, MAX1880, MAX1881, MAX1882, MAX1883, MAX1884, MAX1885

Quad-Output TFT LCD DC-DC Converters with Buffer

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The MAX1778/MAX1880–MAX1885 multiple-output DC-DC converters provide the regulated voltages required by active matrix thin-film transistor (TFT) liquid crystal displays (LCD) in a low-profile TSSOP package. One high-power step-up converter and two low-power charge pumps convert the 2.7V to 5.5V input voltage into three independent output voltages. A built-in linear regulator and VCOM buffer complete the power-supply requirements.

The main step-up converter accurately generates an externally set output voltage up to 13V that can supply the display's row/column drivers. The converter's high switching frequency and current-mode PWM architecture provide fast transient response and allow the use of small low-profile inductors and ceramic capacitors. The low-power BiCMOS control circuitry and internal 14V switch (0.35≈ N-channel MOSFET) enable efficiencies up to 91%.

The dual low-power charge pumps (MAX1778/ MAX1880/MAX1881/MAX1882 only) independently regulate one positive output (V_POS) and one negative output (V_NEG). These low-power outputs use external diode and capacitor stages (as many stages as required) to regulate output voltages up to +40V and -40V. A unique control scheme minimizes output ripple as well as capacitor sizes for both charge pumps.

A resistor-programmable, 40mA, low-dropout linear regulator (MAX1778/MAX1881/MAX1883/MAX1884 only) provides preregulation or postregulation for any of the supplies. For higher current applications, an external transistor can be added. Additionally, the VCOM buffer provides a high current output that is ideal for driving the capacitive backplane of TFT LCD panels. The VCOM buffer's output voltage is preset with an internal 50% resistive-divider or can be externally adjusted for other voltages.

The MAX1778/MAX1880–MAX1885 are protected against output undervoltage and thermal overload conditions by a latched fault detection circuit that shuts down the device. All devices are available in the ultra-thin TSSOP package (1.1mm max height).

Data Sheet

Download	Rev 1	(PDF, 616kB)
E-Mail

An evaluation kit is available: MAX1778EVKIT

Key Features

500kHz/1MHz Current-Mode PWM Step-Up Regulator
- Up to +13V Main High-Power Output
- ±1% Accurate
- High Efficiency (91%)
Dual Regulated Charge-Pump Outputs (MAX1778/MAX1880/MAX1881/MAX1882 only)
- Up to +40V Positive Charge-Pump Output
- Up to -40V Negative Charge-Pump Output
Low-Dropout 40mA Linear Regulator (MAX1778/MAX1881/MAX1883/MAX1884 only)
- Up to +15V LDO Input
Optional Higher Current with External Transistor
2.7V to 5.5V Input Supply
Internal Supply Sequencing and Soft-Start
Power-Ready Output
Adjustable Fault-Detection Latch
Thermal Protection (+160°C)
0.1µA Shutdown Current
0.7mA IN Quiescent Current
Ultra-Small External Components
Thin TSSOP Package (1.1mm max height)

Applications/Uses

TFT LCD Desktop Monitor Panels
TFT LCD Notebook 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)

Inverting Outputs

Package/Pins

Smallest Available Pckg.
(mm²)

Budgetary Price

min

max

min

max

≥

≤

max w/pins

See Notes

MAX1778

Step-Up

Shutdown

Current Limit

Fixed Freq./PWM

Internal Pwr. FETs

Soft Start

TFT Bias

VCOM Buffer

2.7

5.5

2.7

0.75

1000

TSSOP/24

52.4

$3.89 @1k

MAX1880

1000

TSSOP/24

52.4

$3.78 @1k

MAX1881

500

TSSOP/24

52.4

$1.61 @1k

MAX1882

500

TSSOP/24

52.4

MAX1883

1000

TSSOP/20

45.2

MAX1884

500

TSSOP/20

45.2

MAX1885

500

TSSOP/20

45.2

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

Typical Operating Circuit

Reliability Reports

Reliability Report:	MAX1880.pdf MAX1882.pdf MAX1883.pdf
Show FIT data for:
Request Reliability Report 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
MAX1778EUG			Active	TSSOP;24 pin;52.4 mm² Outline Drawing:21-0066 (PDF) Land Pattern: 90-0118 (PDF) Use pkgcode/variation: U24-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1778EUG+			Active	TSSOP;24 pin;52.4 mm² Outline Drawing:21-0066 (PDF) Land Pattern: 90-0118 (PDF) Use pkgcode/variation: U24+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1778EUG+T			Active	TSSOP;24 pin;52.4 mm² Outline Drawing:21-0066 (PDF) Land Pattern: 90-0118 (PDF) Use pkgcode/variation: U24+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1778EUG-T			Active	TSSOP;24 pin;52.4 mm² Outline Drawing:21-0066 (PDF) Land Pattern: 90-0118 (PDF) Use pkgcode/variation: U24-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1880EUG			Active	TSSOP;24 pin;52.4 mm² Outline Drawing:21-0066 (PDF) Land Pattern: 90-0118 (PDF) Use pkgcode/variation: U24-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1880EUG+			Active	TSSOP;24 pin;52.4 mm² Outline Drawing:21-0066 (PDF) Land Pattern: 90-0118 (PDF) Use pkgcode/variation: U24+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1880EUG+T			Active	TSSOP;24 pin;52.4 mm² Outline Drawing:21-0066 (PDF) Land Pattern: 90-0118 (PDF) Use pkgcode/variation: U24+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1880EUG-T			Active	TSSOP;24 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1881EUG			Active	TSSOP;24 pin;52.4 mm² Outline Drawing:21-0066 (PDF) Land Pattern: 90-0118 (PDF) Use pkgcode/variation: U24-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1881EUG+			Active	TSSOP;24 pin;52.4 mm² Outline Drawing:21-0066 (PDF) Land Pattern: 90-0118 (PDF) Use pkgcode/variation: U24+1*	-40°C to +85°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
MAX1881EUG+T			Active	TSSOP; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1881EUG-T			Active	TSSOP;24 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1882EUG			Active	TSSOP;24 pin;52.4 mm² Outline Drawing:21-0066 (PDF) Land Pattern: 90-0118 (PDF) Use pkgcode/variation: U24-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1882EUG-T			Active	TSSOP; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1883EUP			Active	TSSOP;20 pin;45.2 mm² Outline Drawing:21-0066 (PDF) Land Pattern: 90-0116 (PDF) Use pkgcode/variation: U20-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1883EUP-T			Active	TSSOP;20 pin Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1884EUP			Active	TSSOP;20 pin;45.2 mm² Outline Drawing:21-0066 (PDF) Land Pattern: 90-0116 (PDF) Use pkgcode/variation: U20-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1884EUP-T			Active	TSSOP; Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX1885EUP			Active	TSSOP;20 pin;45.2 mm² Outline Drawing:21-0066 (PDF) Land Pattern: 90-0116 (PDF) Use pkgcode/variation: U20-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1885EUP-T			Active	TSSOP; 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

MAX1778EVKIT

Evaluation Kit for the MAX1778, MAX1880, MAX1881, MAX1882

Products with Similar Part Numbers

MAX1778EVKIT

Evaluation Kit for the MAX1778, MAX1880, MAX1881, MAX1882

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Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Document Ref.: 19-1979 Rev 1; 2005-09-20
This page last modified: 2007-07-24

Quad-Output TFT LCD DC-DC Converters with Buffer

Status

Description

Data Sheet

Key Features

Applications/Uses

Key Specifications:

Diagram

Reliability Reports

Software/Models

Ordering Information

Similar Products by Function

Similar Products by Application

Evaluation Kits

Products with Similar Part Numbers

Didn't Find What You Need?

Information Index

Overview

Technical Documents

Ordering Info

Related Products