描述 Description

The SM41NB consists of two high performance step-up regulators (a PAVDD boost converter, a VON boost converter), a high performance NAVDD buck-boost regulator, a negative charge pump regulator, a VCOM calibrator and a high speed operational amplifier (OP Amp). All output voltages are programmable using I2C serial interface. The PAVDD boost converter and NAVDD buck-boost converter provide the regulated supply voltage for the panel source driver ICs. The VON boost converter provides the regulated voltage for the positive supply of gate driver ICs. The negative charge pump regulator provides the regulated voltage for the negative supply of gate driver ICs. The VCOM calibrator replaces mechanical potentiometers so that it significantly reduces labor costs, increases reliability and enables automation. The highspeed op amp is designed to drive the LCD backplane (VCOM) with the capability of high current and wide bandwidth. The device is optimized for thin-film transistor (TFT)liquid-crystal display (LCD) applications.

特性 Features

? 2.5 V to 4.8 V Input Supply Voltage Range
? High-Efficiency Step-Up Regulator for PAVDD
? 5-bit Programmable Output: 3.95 V to 5.5 V
? Peak-Current Mode Control – Fast Transient
? Built-in 6 V, 1.5 A MOSFET
? High-Efficiency Buck-Boost Regulator for NAVDD
? 5-bit Programmable Output: -3.95 V to -5.5 V
? Peak-Current Mode Control – Fast Transient
? Built-in 6 V, 1.5 A MOSFET
? High-Efficiency Step-Up Regulator for VON
? 8-bit Programmable Output: 8.1 V to 33.5 V
? 4-bit Low Temperature Output: 13.5 V to 36 V
? Voltage Mode Control
? Temperature-Compensated Output
? Built-in 40 V, 1.1 A, TBD mΩ MOSFET
? Negative Charge-Pump Regulator for VOFF
? 5-bit Programmable Single Stage Output:???? -6.0 V to -12.0 V
? 4-bit Programmable Double Stage Output:???? -6.4 V to -18.0 V
? Programmable VCOM Calibrator (0x9E)
? 4-bit Programmable VCOM Range
? 128-Step Adjustable Output. I2C Interface
? High-Speed OP-Amp
? 15 MHz, - 3 dB Bandwidth
? 150 V / μs Slew Rate. 150 mA Output Current
? Protections
? Thermal Shutdown
? Overvoltage Protection. Over Current Protection
? Diode Open Protection. Undervoltage Protection

應(yīng)用 Application

Notebooks, Tablets