Description

KTD2694 is the ideal power solution for high-power flash LEDs used with cell phone camera modules or digital still cameras. It is a highly integrated step up DC-DC converter with very high switching frequency, fixed at 2MHz, providing a very small total solution for portable photo flash. KTD2694 uses ExpressWireTM single-wire programming for maximum flexibility. The maximum flash mode LED current is set by an external resistor, and the flash-mode and movie-mode currents can be programmed in 16 steps by the ExpressWireTM interface at CTRL pin. An AUX pin allows highest priority ON/OFF flash mode control. KTD2694 internally monitors the input voltage, disabling LED current when the supply drops below the programmed threshold voltage.

The LED output sink can drive up to 1.5A continuous LED current. Thermal regulation is integrated in flash mode to limit the IC’s temperature and continuously provide the maximum allowed output current.

Various protection features are built into KTD2694, including cycle-by-cycle input current limit protection, output over-voltage protection, LED fault (open or short) protection, flash timeout protection and thermal shutdown protection. The leakage current in shutdown mode is 0.1µA.

KTD2694 is available in a RoHS and Green compliant 10-lead 2mm x 2mm x 0.52mm UDFN package.

Features

  • Drive up to 1.5A flash current
  • Programmable threshold low-voltage input protection
  • High efficiency converter (up to 90%)
  • Input voltage range: 2.7V to 5.5V
  • 2MHz step-up converter
  • Very small inductor: 1.0μH to 2.2μH
  • Very small load capacitor: 4.7μF to10μF
  • ExpressWireTM digital control enables and programs flash and movie current in 16 steps
  • External resistor sets maximum flash current
  • Integrated thermal regulation control
  • 2mA LED shorting test current and 1.7V forward voltage threshold
  • LED open/short protection
  • Over-voltage protection
  • Cycle-by-cycle inductor current limit
  • Programmable Flash Time out protection 0.1μA shutdown current
  • Pb-free Package: UDFN22-10L
  • -40°C to +85°C Temperature Range

Applications

  • Mobilephones
  • Smart Phones and PDAs
  • Digital Still Cameras

Packaging Information

Package Dimensions Bumps Package Code
UDFN22-10 2.00mm x 2.00mm x 0.52mm 10 DQ

Parameters

Vin (min)  Vin (max)  Max Current Per Channel Channels
2.7V 5.5V 1500mA 1

Technical Documentation

Description Documents Type
DatasheetKTD2694-04bPDF
Package Outline DrawingUDFN22-10 DQ PODPDF

Purchase

Part Number Marking Operating Temperature Package
KTD2694EDQ-TR KLYYZ -40°C to +85°C UDFN22-10
Purchase Options
Buy from Digi-Key
Buy from Mouser