Features

 Wide 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 with external

resistors

 Positive output voltage range

 +4.0V to +6.3V (100mV/step)

 Negative output voltage range

 -4.0V to -6.3V (100mV/step)

 1.5 output voltage accuracy

 Regulated output current up to 80mA

 Active output discharge when disabled

 Integrated compensation and feedback circuits

 1 μA shutdown supply current

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

 -40°C to +85°C Temperature Range

Applications

 Smartphone TFT-LCD

 Tablet TFT-LCD

 General Dual Power Supply Applications

Brief Description

The KTD2159 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 a highly integrated step-up DC-DC converter

with wide input voltage range from 2.7V to 5.5V. An LDO

and charge pump generate dual outputs from +4.0V to

+6.3V (100mV/step) and -4.0V to -6.3V (100mV/step),

whose voltages can be programmed via external resistors.

Optimized step-up, LDO and charge pump converters

maximize conversion efficiency, exceeding 85.

KTD2159 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 external resistors allows to set the positive and

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

respectively.

KTD2159 is available in a RoHS compliant 15-bump

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

2.5 x 3.0 x 0.75mm.