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ADM8830

Analog Devices
Part Number ADM8830
Manufacturer Analog Devices
Description Charge Pump Regulator for Color TFT Panel
Published Mar 23, 2005
Detailed Description Charge Pump Regulator for Color TFT Panel ADM8830 FEATURES 3 Output Voltages (+5.1 V, +15.3 V, –10.2 V) from One 3 V Inp...
Datasheet PDF File ADM8830 PDF File

ADM8830
ADM8830

Overview
Charge Pump Regulator for Color TFT Panel ADM8830 FEATURES 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 Quiescent Current Low Shutdown Current (<1 A) Fast Transient Response Shutdown Function Power Saving during Blanking Period Option to Use External LDO APPLICATIONS Handheld Instruments TFT LCD Panels Cellular Phones FUNCTIONAL BLOCK DIAGRAM C5 2.
2F VOLTAGE DOUBLER C1+ C1– VOUT CLKIN OSCILLATOR LDO VOLTAGE REGULATOR CONTROL LOGIC DOUBLE LDO IN C6 2.
2F +5VOUT +5VIN C2+ C2– TIMING GENERATOR VOLTAGE TRIPLER SHDN SHUTDOWN CONTROL DISCHARGE VOLTAGE INVERTER TRIPLE C3+ C3– C2 1F C3 1F +15.
3V C8 1F VCC ADM8830 C1 2.
2F SCAN/BLANK LDO_ON/OFF +5.
1V C7 2.
2F +15VOUT C4+ C4– C4 1F GENERAL DESCRIPTION –10VOUT GND The ADM8830 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 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 ADM8830 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 ADM8830 switches to use an external, lower frequency clock.
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