特性 Features

? Input voltage range (2.7V to 5.5V)

? Dual output regulator with single inductor

? High efficiency above 85

? Charge pump with PFM mode at light load

? Programmable output voltages

? Positive output voltage range

? +4.0V to +6.3V (100mV/step)

? Negative output voltage range

? -4.0V to -6.3V (100mV/step)

? Programmable regulator offset voltage

? 1.0 output voltage accuracy

? Output current up to +200mA, -150mA

? Programmable active discharge

? I2C compatible interface

? 1 μA shutdown supply current

? Pb-free WLCSP-15 package

? -40°C to +85°C Temperature Range

Applications

? Smartphone or Tablet TFT-LCD

? Operational Amplifiers

? Audio Amplifier Power

? Digital to Analog converters

? General Dual Power Supply Applications

Brief Description

The KTZ8812 is a dual output power supply IC used in

portable appliances where both a positive and negative

supply is required. The positive and negative output rails

provide bias supplies for TFT LCD panels, OPA, Audio

Amplifiers, DAC etc. The device only requires a single

inductor, thereby minimising the total PCB area.

It features an integrated step-up DC-DC converter with

input voltage range from 2.7V to 5.5V. An LDO and charge

pump generate dual regulated outputs, whose voltages

can be programmed via an I2C compatible interface.

Optimized step-up, LDO and charge pump converters

maximize conversion efficiency, exceeding 85.

KTZ8812 integrates all compensation and soft-start

circuitry, which results in a simpler and smaller solution

with much fewer external components. High switching

frequency (1.8MHz) allows the use of a smaller inductor

and capacitor to further reduce the solution size.

The I2C compatible interface allows control of the positive

and negative outputs from +4.0V to +6.3V and from -4.0V

to -6.3V, respectively, as well as programming additional

registers on the device.

KTZ8812 is available in a RoHS compliant 15-bump

2.2mm x 1.45mm x 0.62mm WLCSP.