MXT7660 charge pump inverter

Release time:

2014-06-04

The MXT7660 charge pump inverter is made using a mature high-voltage AL gate CMOS process. This device requires only two external capacitors to convert an input voltage of +2.5V to +10V into an output voltage of -2.5V to -10V. It does not require inductors, reducing losses and electromagnetic interference. The circuit consists of a voltage regulator, RC oscillator, level shifting circuit, and MOS power transistors.

　　1. Overview
　　The MXT7660 charge pump inverter is made using a mature high-voltage AL gate CMOS process. This device can convert an input voltage of +2.5V to +10V into an output voltage of -2.5V to -10V with just two external capacitors. No inductors are required, reducing losses and electromagnetic interference. The circuit consists of a voltage regulator, RC oscillator, level shifting circuit, and MOS power transistors, among others. When the supply voltage is 5V and pin 7 is open, the internal local oscillator frequency is 10KHz. The MXT7660 is used for LCD display driving, RS232 negative power supply, data acquisition, and instrumentation amplifier negative power supply. Its main features are as follows:
　　+5V converts to ±5V with a wide input voltage range: 2.5V to 10V
　　High voltage conversion efficiency: 99.9% (typical value) High power conversion efficiency: 98% (typical value)
　　Low power consumption: Is ≤40uA (+5V supply) Few external components make it easy to use
　　High electrostatic breakdown voltage: ≥3KV No need for connecting Dx diodes during high-voltage operation
　　Black ceramic SO-8 package form better meets the requirements for high reliability and high assembly density in military products
　　2. Electrical Schematic
　　3. Package Form and Pin Functionality
　　1. Package Form
　　Uses TO-08 metal fully sealed package, D08S2 ceramic dual in-line package, and SO-08 black ceramic micro package.
　　(TO-08 • Top View) (D08S2 • Top View) (SO-08 • Top View)
　　2. Pin Functionality
　　Pin Number: 1 2 3 4 5 6 7 8
　　Symbol: NC C+ GND C- OUT LV OSC V+
　　Function: Empty External capacitor positive terminal External capacitor negative terminal Output Low Voltage Select Oscillation Capacitor Input Voltage
　　4. Absolute Maximum Ratings
　　+10.5V Power Supply Voltage Output short-circuit duration not limited (V+ ≤5.5V)
　　-65℃ to +150℃ Storage Temperature Operating Temperature Range -55℃ to +125℃
　　(SO-8) Power Consumption:500mW LV and OSC pin input voltage -0.3V to V++0.3V (V+ ≤5.5V)
　　(TO-8/D08S2) V+-5.5V to V++0.3V (V+ >5.5V)
　　5. Electrical Characteristics
　　(Unless otherwise specified: V+=+5V, OSC=NC, TA=+25℃)
　　| Parameter Name | Symbol | Test Conditions | Specification Value | Unit |
　　最小值典型值最大值
　　静态电流IS RL=∞40 1 uA
　　输入高电压V+H LV=NC 3.5 10 V
　　输入低电压V+L LV=0V 2.5 3.5 V
　　输出电阻Rout Iout=20mA 70Ω
　　Iout=5mA,V+=3V 120
　　振荡频率FOSC 10 KHz
　　电源效率PEFF RL=5KΩ95 98%
　　转换精度VOEFF RL=∞98 99.9%
　　六．典型应用
　　1．正电压转负电压应用2．+5V产生-10V应用
　　注：V+≥3.5V时，K断开；V+<3.5V时，K闭合。注：这种情况下输出阻抗为两个器件阻抗的总和。
　　七．应有说明
　　1．输入电压不能高于最大额定值。
　　2．输入电压高于3.5V时，LV端不能接地。
　　3．输入电压高于5.5V时，输出端不能长时间对地短路。
　　4．严格按应用图区分电容正负极性，不能接反。
　　5．如果供该器件电源的源阻抗较大时（25Ω-30Ω），需要在8端对地接一2.2uF的电容。
　　6．输出电压≥0V时会造成器件闩锁，使器件失效，为防止该情况发生，可在输出端对地接入一个1N914二极管（阳极接5#端，阴极接3#端）。
　　7．TA=+125℃，对器件的输出电流要进行降额设计。

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