ADM8839-EVALZ: 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 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 IdleTM). 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.
ADM8839-EVALZ 特点
- 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 uA)
- Shutdown Function
- Option to Use External LDO
ADM8839-EVALZ 功能框图
| 产品型号 | 产品状态 | 封装 | 引脚 | 温度范围 |
|---|---|---|---|---|
| ADM8839-EVALZ | 量产 | 评估板 | 20 | 待定 |
| ADM8839ACP | 量产 | 20 ld LFCSP (4x4mm) | 20 | 工业 |
| ADM8839ACP-REEL | 量产 | 20 ld LFCSP (4x4mm) | 20 | 工业 |
| ADM8839ACP-REEL7 | 量产 | 20 ld LFCSP (4x4mm) | 20 | 工业 |
| ADM8839ACPZ | 量产 | 20 ld LFCSP (4x4mm) | 20 | 工业 |
| ADM8839ACPZ-REEL | 量产 | 20 ld LFCSP (4x4mm) | 20 | 工业 |
| ADM8839ACPZ-REEL7 | 量产 | 20 ld LFCSP (4x4mm) | 20 | 工业 |