Description

KTD3117-1 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. KTD3117-1 integrates a 40V 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 inductor and capacitor to further reduce the solution size.

Three regulated current sinks in KTD3117-1 provide per channel 20mA (max.) factory programmed current. With a 31V OVP, each string can connect up to eight LEDs in series, for a total of 24 LEDs in KTD3117.

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 KTD3117-1, 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.

KTD3116-1 is available in a RoHS compliant and Green 9-lead 1.2mm x 1.2mm WLCSP package.

Features

  • 3 strings, 24 LEDs total
  • High efficiency: up to 90%
  • High frequency step-up converter (800kHz)
  • Wide input range: 2.7V to 5.5V
  • Integrated 40V Power MOSFET
  • Internal compensation and soft start
  • Integrated 2- or 3-channel current sink
  • Preset 20mA full-scale current per channel
  • 1.5% Typ. current matching
  • PWM dimming with < 0.3µs rise/fall time
  • Low quiescent current
  • LED open/short protection
  • 31V LED open-circuit (OVP) threshold
  • Cycle-by-cycle inductor current limit
  • < 1µA shutdown current
  • Pb-free Package: 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/Pins/ Pads Package Code
WLCSP 1.2mm x 1.2mm x 0.62mm 9 AA

Technical Documentation

Description Documents Type
DatasheetKTD3116-1-04aPDF

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