Add to Signal Chain Designer

ADM8839:  Charge Pump Regulator for Color TFT Panel

Product Details


The ADM8839 is a charge pump regulator, used for colour TFT (Thin Film Transistor) LCD’s (Liquid Crystal Displays). The device can be used to generate 3 output voltages (+5 V ±2%, +15 V, -15 V) from a single 2.7V - 4.2V (li-ion) input supply, using charge pump technology. These voltages are then used to provide supplies for the LCD controller (5 V ±2%), and the gate drives for the transistors in the panel (+15 V and -15 V). Only a few external capacitors are needed for the charge pumps. An efficient low dropout voltage regulator also ensures that the power efficiency is high and provides a low ripple 5 V output. This LDO can be shutdown and an external LDO used to regulate the 5 V doubler output and to drive the input to the charge pump section which generates the +15 V and -15 V outputs if so required by the user.

The ADM8839 has a power save shutdown feature. The 5 V output consumes the most power, so Power Efficiency is also maximised on this output with an oscillator enabling scheme (Green Idle™). This effectively senses the load current that is flowing and turns on the charge pump only when charge needs to be delivered to the 5 V pump doubler output.

The ADM8839 is fabricated using CMOS technology for minimal power consumption. The part is packaged in a 20- lead LFCSP (Lead Frame Chip Scale Package) with a tiny 4mm x 4mm footprint.

FEATURES and BENEFITS

  • Voltages (+5 V, +15 V, –15 V) from a Single 3 V Supply
  • Power Efficiency Optimized for Use with TFT in Mobile Phones
  • Low Quiescent Current
  • Low Shutdown Current (<5 µA)
  • Shutdown Function
  • Option to Use External LDO

Functional Block Diagram for ADM8839

Documentation

Title Content Type File Type
ADM8839: Charge Pump Regulator for Color TFT Panel Data Sheet (Rev C, 07/2006) (pdf, 365 kB) Data Sheets PDF
Charge Pumps Products (March 2003)  (pdf, 848 kB) Solutions Bulletins PDF
Charge Pump Application Bulletin  (pdf, 970 kB)
All new applications guide for charge pumps
Overview PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

SampleSample & Buy

Price, packaging, availability

ADM8839 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADM8839ACP Status: Obsolete 20 ld LFCSP (4x4mm) 20 Ind Tray, 490 - - N  Material Info PDN Contact ADI
ADM8839ACP-REEL7 Status: Obsolete 20 ld LFCSP (4x4mm) 20 Ind Reel, 1500 - - N  Material Info PDN Contact ADI
ADM8839ACPZ Status: Obsolete 20 ld LFCSP (4x4mm) 20 Ind Tray, 490 - - Y  Material Info PCN/PDN Contact ADI
ADM8839ACPZ-REEL Status: Last Time Buy 20 ld LFCSP (4x4mm) 20 Ind Reel, 5000 - $1.98 Y  Material Info PCN/PDN Purchase
ADM8839ACPZ-REEL7 Status: Obsolete 20 ld LFCSP (4x4mm) 20 Ind Reel, 1500 - - Y  Material Info PCN/PDN Contact ADI
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


沪ICP备09046653号
content here.
content here.

Review this Product

Close