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ADM8832ACPZ1 Fiches technique(PDF) 1 Page - Analog Devices |
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ADM8832ACPZ1 Fiches technique(HTML) 1 Page - Analog Devices |
1 / 12 page Charge Pump Regulator for Color TFT Panel ADM8832 Rev. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved. 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 µA) 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 LDO VOLTAGE REGULATOR VOLTAGE DOUBLER DISCHARGE C1+ C1– VOUT LDO IN +5VOUT +5VIN C2+ C2– C3+ C3– +15VOUT C4+ C4– –10VOUT C1 2.2 µF C6 2.2 µF C2 1 µF C7 2.2 µF +5.1V C3 1 µF +15.3V C8 1 µF C4 1 µF –10.2V C9 1 µF VOLTAGE TRIPLER DOUBLE TRIPLE VOLTAGE INVERTER CLKIN SCAN/ BLANK LDO_ON/ OFF GND VCC TIMING GENERATOR CONTROL LOGIC SHUTDOWN CONTROL OSCILLATOR ADM8832 C5 2.2 µF SHDN Figure 1. GENERAL DESCRIPTION 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 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 scan- ning mode to blanking mode or vice versa. The ADM8832 power saving features include low power shutdown and reduced quiescent current consumption during the blanking periods. 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). |
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