EUP2471
1.5A Dual WLED Flash Driver
with I
2
C Compatible Interface
DESCRIPTION
The EUP2471 is a 2MHz fixed frequency, current mode
synchronous boost converter. The device is designed to
operate as a dual 750mA (1.5A total) constant current
driver for flash white LED application.
An industry-standard I
2
C serial digital input is used to
enable, disable and set the movie-mode current for each
flash LED with up to 16 movie-mode settings. The
EUP2471 also includes a separate Flash Enable input to
initiate both the flash operation and the default timer,
which can be used either to terminate a flash event at the
end of a user-programmed delay or as a safety feature.
The maximum flash and movie-mode current is set by
one external resistor; the ratio of Flash to Movie-mode
current is set at approximately 6.1:1.
An over-voltage protection feature keeps the output
voltage below the OVP threshold in case of an open LED
and an output short circuit protection limits the output
current during an output short to GND. The chip’s
quiescent current is less than 1.0µA in shutdown mode.
FEATUES
2.7V to 5.5V Input Supply Range
Dual Channel Output with Separate
Flash Enable
Up to 1.5A Regulated Output Current
(750mA per channel)
Up to 85% Efficiency
2 MHz Fixed Switching Frequency
I
2
C Compliant Serial Interface
- 400kHz Serial Transfer Rate
-16 Level Movie-mode Current
-Flash/Movie-mode
-Programmable LED Current
-Programmable Flash Safety Timer
True Load Disconnect
Input Current Limit
Output Over-Voltage, Short Circuit, and
Over-Temperature Protection
3mm
×
3mm TDFN-14 Package
RoHS Compliant and 100% Lead (Pb)-Free
Halogen-Free
APPLICATIONS
Camera-enabled Cellular Phones
and Smart Phones
Digital Still Cameras (DSCs)
LED Photo Flash/Torch
Typical Application Circuit
Figure 1. EUP2471 Two Flash LEDs Typical Application
DS2471
Ver1.1
Jul. 2011
1
EUTECH [ EUTECH MICROELECTRONICS INC ]
