Description

KTD3112/KTD3113 is the ideal power solution for white LED backlighting used with medium to small size LCD panels. It is a highly integrated step up DC-DC converter with input voltage range from 2.7V to 5.5V, accommodating 1-cell lithium ion battery or 5V regulated supply. KTD3112/3 integrates a 30V Power MOSFET as well as compensation and soft start circuitry, which results in a simpler and smaller solution with much fewer external components. High switching frequency (800kHz) allows the use of a smaller sized inductor and capacitor.

Two regulated current sinks in KTD3112 and three sinks in KTD3113 provide per channel 20mA/25mA (max.) factory programmed current. With a 25V OVP, each string can connect up to six LEDs in series, for a total of 12 or 18 LEDs in KTD3112 and KTD3113 respectively.

A PWM dimming control is included for wide output dimming range. The device has an EN pin which enables the IC.

Various protection features are built into KTD3112/3, including cycle-by-cycle input current limit protection, output over-voltage protection, LED fault (open or short) protection and thermal shutdown protection. The leakage current in shutdown mode is less than 1µA.

KTD3112/3 is available in a RoHS compliant and Green 16-lead 3mm x 3mm x 0.75mm ThinQFN or 9-lead 1.2mm x 1.2mm WLCSP package.

Features

  • Drive up to 6 LEDs per string
  • KTD3112: 2 strings, 12 LEDs total
  • KTD3113: 3 strings, 18 LEDs total
  • High efficiency: up to 90%
  • High frequency step-up converter (800kHz)
  • Wide input range: 2.7V to 5.5V
  • Integrated 30V Power MOSFET
  • Internal compensation and soft start
  • Integrated 2- or 3-channel current sink
  • Preset max. 20mA/25mA current per channel
  • 1.5% Typ. current matching
  • PWM dimming with < 0.3µs rise/fall time
  • Low quiescent current
  • LED open/short protection
  • 25V LED open-circuit (OVP) threshold
  • Cycle-by-cycle inductor current limit
  • < 1µA shutdown current
  • Pb-free Packages: TQFN33-16, WLCSP-9 1.2mm x 1.2mm
  • -40°C to +85°C Temperature Range

Applications

  • Smartphone
  • PDA
  • GPS
  • Portable media players
  • Other 1-cell Li Ion LED applications

Packaging Information

Package Dimensions Bumps Package Code
TQFN33-16 3.00mm x 3.00mm x 0.75mm 16 FJ

Parameters

Vin (min)  Vin (max)  Max. Current per Channel Channels Control Type
2.7V 5.5V 20 or 25mA 2 PWM

Technical Documentation

Description Documents Type
DatasheetKTD3112-KTD3113-04aPDF
Package Outline DrawingTQFN33-16 FJ 3D PODPDF

Purchase

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