Add to Signal Chain Designer

ADM8832:  Charge Pump Regulator for Color TFT Panel

Product Details


The ADM8832 is a charge pump regulator used for color thin film transistor (TFT) liquid crystal displays (LCD). Using charge pump technology, the device can be used to generate three output voltages (+5.1 V ±2%, +15.3 V, –10.2 V) from a single 3 V input supply. These outputs are then used to provide supplies for the LCD controller (+5.1 V) and the gate drives for the transistors in the panel (+15.3 V and –10.2 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 5.1 V output. This LDO can be shut down and an external LDO used to regulate the 5 V doubler output and drive the input to the charge pump section, which generates the +15.3 V and –10.2 V outputs if so required by the user.

The ADM8832 has an internal 100 kHz oscillator for use in scanning mode, but the part must be clocked by an external clock source in blanking (low current) mode. The internal oscillator is used to clock the charge pumps during scanning mode where the current is highest. During blanking periods, the ADM8832 switches to use an external, lower frequency clock. This allows the user to vary the frequency and maximize power efficiency during blanking periods. The tolerances on the output voltages are seamlessly maintained when switching from scanning mode to blanking mode or vice versa.

The ADM8832 has a number of power saving features, including low power shutdown and reduced quiescent current consumption during the blanking periods mentioned above. The 5.1 V output consumes the most power, so power efficiency is also maximized 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 ADM8832 is fabricated using CMOS technology for minimal power consumption. The part is packaged in a 20-lead LFCSP (lead frame chip scale package).

FEATURES and BENEFITS

  • 3 output voltages (+5.1 V, +15.3 V, -10.2 V) from one 3 V input supply
  • Power efficiency optimized for use with TFT in mobile phones
  • Low shutdown current (<1 µA)
  • Low quiescent current
  • Fast transient response
  • Shutdown function
  • Power saving during blanking period
  • Option to use external ldo

Functional Block Diagram for ADM8832

Documentation

Title Content Type File Type
ADM8832: Charge Pump Regulator for Color TFT Panel Data Sheet  (Rev A, 05/2004) (pdf, 206 kB) Data Sheets PDF
Innovative Power Reduction Techniques Enable Handset Manufacturers to Provide Media Rich Devices
The demand for mobile devices with high-end features has been rapidly increasing. Features like text messaging, gaming, GPS navigation, web browsing and video playback on high resolution color displays are becoming the norm in today’s portable consumer electronics market.
(LED Journal, August/September 2009)
Technical Articles HTML
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

ADM8832 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADM8832ACP Status: Obsolete 20 ld LFCSP (4x4mm) 20 Ind Tray, 490 - - N  Material Info PDN Contact ADI
ADM8832ACP-REEL Status: Obsolete 20 ld LFCSP (4x4mm) 20 Ind Reel, 5000 - - N  Material Info PCN/PDN Contact ADI
ADM8832ACP-REEL7 Status: Obsolete 20 ld LFCSP (4x4mm) 20 Ind Reel, 1500 - - N  Material Info PDN Contact ADI
ADM8832ACPZ Status: Production 20 ld LFCSP (4x4mm) 20 Ind Tray, 490 $2.23 $2.02 Y  Material Info PCN Purchase Sample
ADM8832ACPZ-REEL Status: Production 20 ld LFCSP (4x4mm) 20 Ind Reel, 5000 - $2.02 Y  Material Info PCN Purchase
ADM8832ACPZ-REEL7 Status: Production 20 ld LFCSP (4x4mm) 20 Ind Reel, 1500 - $2.02 Y  Material Info PCN Purchase
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.

ADM8832 Evaluation Tools
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
ADM8832-EVALZ Status: Production Evaluation Board - Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

Check Inventory & Purchase

View Sales and Distribution Offices

沪ICP备09046653号
content here.
content here.

Review this Product

Close