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ADM8839:  Charge Pump Regulator for Color TFT Panel

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 ...More

ADM8839:  Charge Pump Regulator for Color TFT Panel

Product Description

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.

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  • 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
  • Input Voltage (V): 2.6 - 3.6
  • Vout Preset (V): +5/+15/-15
  • Iout : 8mA
  • Vout #2 (V): 15V
  • Iout #2 (µA): 150µA
  • Vout #3 (V): -15V
  • Iout #3 (µA): 150µA
  • Power Efficiency (%): 82%
  • Supply Current : 500µA
  • Shutdown Current, max: 5µA
  • Package: LFCSP-20

Functional Block Diagram for ADM8839

类似产品

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Part# Input Voltage (V) Vout Preset (V) Iout Power Efficiency (%) Supply Current Shutdown Current, max Boost Inverter Regulated Output Package Price* (1000-4999)
ADM660 1.5 - 7 -Vin or 2*Vin 100mA 80 4.5mA 5µA Y Y --- DIP/SO/TSSOP $1.82
ADM8660 1.5 - 7 -Vin 100mA 80 4.5mA 5µA --- Y --- DIP/SO/TSSOP $1.92
ADM8828 1.5 - 5.5 -Vin 25mA 99 1mA 2µA --- Y --- 6-Lead SOT 23 $0.76
ADM8829 1.5 - 5.5 -Vin 25mA 99 1mA n/a --- Y --- 6-Lead SOT 23 $0.76
ADM8832 2.6 - 3.6 +5.1/+15.3/-10.3 5mA 90 400µA 1µA Y Y Y LFCSP-20 $2.02
ADM8839 2.6 - 3.6 +5/+15/-15 8mA 82 500µA 5µA Y Y Y LFCSP-20 $1.92
ADP3605 3-6v -3v/adj 120mA n/a 6mA 15µA --- Y Y SOIC-8, TSSOP-14 $1.50
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* 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.
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