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.

Part#	Input Voltage (V)	Vout Preset (V)	Iout	Power Efficiency (%)	Supply Current (max)	Shutdown Current, max	Boost	Buck	Inverter	Regulated Output	Package	Product Description	Price* (1000-4999)
ADM660	1.5 - 7	-Vin or 2*Vin	100mA	80	4.5mA	5µA	Y	---	Y	---	DIP/SO/TSSOP	CMOS Switched-Capacitor Voltage Inverter or Doubler	$1.80
ADM8660	1.5 - 7	-Vin	100mA	80	4.5mA	5µA	---	---	Y	---	DIP/SO/TSSOP	CMOS Switched-Capacitor Voltage Converter w/ Low Power Shutdown Pin	$1.90
ADM8828	1.5 - 5.5	-Vin	25mA	99	1mA	2µA	---	---	Y	---	6-Lead SOT 23	Switched Capacitor Voltage Inverter w/ Shutdown	$0.75
ADM8829	1.5 - 5.5	-Vin	25mA	99	1mA	n/a	---	---	Y	---	6-Lead SOT 23	Switched Capacitor Voltage Inverter	$0.75
ADM8832	2.6 - 3.6	+5.1/+15.3/-10.3	5mA	90	400µA	1µA	Y	---	Y	Y	LFCSP-20	Charge Pump Regulator for Color TFT Panel	$2.00
ADM8839	2.6 - 3.6	+5/+15/-15	8mA	82	500µA	5µA	Y	---	Y	Y	LFCSP-20	Charge Pump Regulator for Color TFT Panel (Higher Iout for the Three Vouts than the similar ADM8832	$1.90
ADP3605	3-6v	-3v/adj	120mA	n/a	6mA	15µA	---	Y	Y	Y	SOIC-8, TSSOP-14	120 mA Switched Capacitor Voltage Inverter with Regulated Output	$1.48

* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

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• Production: The model is currently being produced, and generally available for purchase and sampling.
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• Obsolete: The specific part is obsolete and no longer available. Other models listed in the table may still be available (if they have a status that is not obsolete).

The package for this IC (i.e. DIP, SOIC, BGA). An Evaluation Board is a board engineered to show the performance of the model, the part is included on the board.

For detailed drawings and chemical composition please consult our  Package Site

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This is the acceptable operating range of the device. The various ranges specified are as follows:

• Commercial: 0 to +70 degrees Celsius
• Military : -55 to +125 degrees Celsius
• Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
• Automotive: -40 to +125 degrees Celsius

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.

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