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MFG:ADI D/C:09
Part Number: ADM8839
MFG: ADI
D/C: 09
Description: The ADM8839 is a charge pump regulator used for color thin film transistor (TFT) liquid crystal displays (LCDs). Using ...
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ADM8839
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DataSheet
General Description
ADM8839 General Description
The ADM8839 is a charge pump regulator used for color thin film transistor (TFT) liquid crystal displays (LCDs). Using charge pump technology, the device can be used to generate three voltages (+5 V ±2%, +15 V, -15 V from a single 3 V supply.These voltages are then used to provide supplies for the LCD controller (5 V) and the gate drives for the transistors in the panel (+15 V and -15 V). Only a few external capacitors ar needed for the charge pumps. An efficient low dropout (LDO)voltage regulator ensures that the power efficiency is high and provides a low ripple 5 V output. This LDO can be shut down and an external LDO can be used to regulate the 5 V doubler output and drive the input to the charge pump section that generates the +15 V and (R)C15 V outputs, if required by the user .
The ADM8839 has a power save shutdown feature. The 5 Voutput consumes the most power, so power efficiency is also maximized on this output with an oscillator enabling scheme(Green IdleTM). This effectively senses the loadcurrent 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).
ADM8839 Maximum Ratings
(TA = 25°,C, unless otherwise noted.
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . .-0.3 V to +6.0
Input Voltage on Digital Inputs . . . . . . . . . . ..-0.3 V to +6.0
Output Short-Circuit Duration to GND . . . . . . . . . . . . .10 sec
Output Voltage
+5 V Output . . . . . . . . . . . . . . . . . . . . . . . . . . .0 V to 7.0 V
-15 V Output . . . . . . . . . . . . . . . . . . . . .. . .-17 V to +0.3V
+15 V Output . . . . . . . . . . . . . . . . . . . . . ..-0.3 V to +17 V
Operating Temperature Range . . . . . . . . . . .-40 to +85
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . .50 mW
Storage Temperature Range . . . . . . . . . . . . .-65to +150
ESD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . .Class I
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . .-0.3 V to +6.0
Input Voltage on Digital Inputs . . . . . . . . . . ..-0.3 V to +6.0
Output Short-Circuit Duration to GND . . . . . . . . . . . . .10 sec
Output Voltage
+5 V Output . . . . . . . . . . . . . . . . . . . . . . . . . . .0 V to 7.0 V
-15 V Output . . . . . . . . . . . . . . . . . . . . .. . .-17 V to +0.3V
+15 V Output . . . . . . . . . . . . . . . . . . . . . ..-0.3 V to +17 V
Operating Temperature Range . . . . . . . . . . .-40 to +85
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . .50 mW
Storage Temperature Range . . . . . . . . . . . . .-65to +150
ESD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . .Class I
ADM8839 Features
3 Voltages (+5 V, +15 V, -15 V) fro a Single 3 V Supply
Power Efficiency Optimized for Use with TFT in Mobile Phones
Low Quiescent Current
Low Shutdown Current (<5 A)
Shutdown Function
Option to Use External LDO
Power Efficiency Optimized for Use with TFT in Mobile Phones
Low Quiescent Current
Low Shutdown Current (<5 A)
Shutdown Function
Option to Use External LDO
ADM8839 Typical Application
Hand-held Instruments
TFT LCD Panels
Cellular Phones
TFT LCD Panels
Cellular Phones
ADM8839 Connection Diagram
ADM8839
PDF/DataSheet Download
- Datasheet: ADM8839
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