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参数资料
| 型号： | ADM8839-EVALZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 1/12页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADM8839 |
| 标准包装： | 1 |
| 主要目的： | 特殊用途 DC/DC，LCD 电源 |
| 输出及类型： | 3，非隔离 |
| 输出电压： | 5V，15V，-15V |
| 电流 - 输出： | 5mA，1µA，1µA |
| 输入电压： | 2.7 ~ 4.2 V |
| 稳压器拓扑结构： | 升压 |
| 频率 - 开关： | 100kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ADM8839 |
| 相关产品： | ADM8839ACPZ-ND - IC CHARGE PUMP REG TFT 20LFCSP ADM8839ACPZ-REEL7-ND - IC CHARGE PUMP REG TFT 20LFCSP ADM8839ACPZ-REEL-ND - IC CHARGE PUMP REG TFT 20LFCSP |
Charge Pump Regulator
for Color TFT Panels
ADM8839
FEATURES
3 voltages (+5 V, +15 V, ?15 V) from a single 3 V supply
Power efficiency optimized for use with TFT in mobile
FUNCTIONAL BLOCK DIAGRAM
C5, 2.2μF
phones
Low quiescent current
Low shutdown current (<5 μA)
Shutdown function
Option to use external LDO
ADM8839
OSCILLATOR
V CC
VOLTAGE
DOUBLER
LDO
C1+
C1, 2.2μF
C1–
VOUT
LDO_IN
C6, 2.2μF
VOLTAGE
APPLICATIONS
LDO_ON/OFF
CONTROL
LOGIC
REGULATOR
+5VOUT
+5VIN
+5V
Hand-held instruments
TFT LCD panels
Cellular phones
TIMING
GENERATOR
DOUBLE
VOLTAGE
TRIPLER
TRIPLE
C2+
C2–
C3+
C3–
C7, 2.2μF
C2, 0.22μF
C3, 0.22μF
VOLTAGE
+15VOUT
C4+
+15V
C8, 0.22μF
SHDN
SHUTDOWN
CONTROL
DISCHARGE
INVERTER
C4–
C4, 0.22μF
GENERAL DESCRIPTION
GND
Figure 1.
–15VOUT
–15V
C9, 0.22μF
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 are
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 ?15 V outputs, if required by the user.
Rev. C
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.
The ADM8839 has a power save shutdown feature. The 5 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 ADM8839 is fabricated using CMOS technology for
minimal power consumption. The part is packaged in a 20-lead
LFCSP (lead frame chip scale package).
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ?2006 Analog Devices, Inc. All rights reserved.
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相关代理商/技术参数 |
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|---|---|
| ADM8840 | 制造商:AD 制造商全称:Analog Devices 功能描述:Charge Pump Regulator & COM Driver for Color TFT Panel |
| ADM8840ACP | 制造商:Analog Devices 功能描述:LCD DRVR 2.7V TO 3.6V 32LFCSP - Bulk |
| ADM8840ACP-REEL7 | 制造商:Analog Devices 功能描述: |
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