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

? Regulated output current up to 80mA

? Programmable active discharge

? I2C compatible interface

? 1 μA shutdown supply current

? Pb-free WLCSP-15 and TDFN-14 packages

? RoHS and Green Compliant

? -40°C to +85°C Temperature Range

Applications

? Smartphone TFT-LCD

? Tablet TFT-LCD

? General Dual Power Supply Applications

Brief Description

The KTD2151 is a TFT-LCD power supply IC for small and

medium size displays for smartphones and tablets. The

positive and negative output rails provide bias supplies for

TFT LCD panels via the Source Driver IC. The device only

requires a single inductor, to reduce 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.

KTD2151 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.

KTD2151 is available in a RoHS and Green compliant 15-

bump 2.2mm x 1.45mm x 0.62mm WLCSP and 14-lead

TDFN 2.5 x 3.0 x 0.75mm.