ZXSC310 Datasheet, PDF (1/16 Pages) Zetex Semiconductors – LED DRIVER SOLUTION FOR LCD BACKLIGHTING

LED DRIVER SOLUTION FOR LCD BACKLIGHTING
ZXSC310
DEVICE DESCRIPTION
The ZXSC310 is a single or multi cell LED driver
designed for LCD backlighting applications. The input
voltage range of the device is between 0.8V and 8V.
This means the ZXSC310 is compatible with single
NiMH, NiCd or Alkaline cells, as well as multi-cell or
LiIon batteries.
The device features a shutdown control, resulting in a
standby current less than 5µA, and an output capable
of driving serial or parallel LED’s. The circuit generates
constant power output, which are ideal for driving
single or multiple LED’s over a wide range of operating
voltages. These features make the device ideal for
driving LED’s particularly in LCD backlight applications
for Digital Still cameras and PDA’s.
The ZXSC310 is a PFM DC-DC controller IC that drives
an external Zetex switching transistor with a very low
saturation resistance. These transistors are the best
switching devices available for this type of conversion
enabling high efficiency conversion with low input
voltages. The drive output of the ZXSC310 LED driver
generates a dynamic drive signal for the switching
transistor.
The circuit can start up under full load and operates
down to an input voltage of 0.8 volts. The solution
configuration ensures optimum efficiency over a wider
range of load currents; several circuit configurations
are possible depending on battery life versus
brightness considerations.
FEATURES
• 94% efficiency
• Minimum operating input voltage 0.8V
• Maximum operating input voltage 8V
• Standby current less than 5µA
• Programmable output current
• Series or parallel LED configuration
• Low saturation voltage switching transistor
• SOT23-5 package
The ZXSC310 is offered in the SOT23-5 package which,
when combined with a SOT23 switching transistor,
generates a high efficiency small size circuit solution.
The IC and discrete combination offers the ultimate
cost Vs performance solution for LED backlight
applications.
TYPICAL APPLICATIONS CIRCUIT
APPLICATIONS
• LCD backlights:
Digital still camera
PDA
Mobile phone
• LED flashlights and torches
• White LED driving
• Multiple LED driving
ORDERING INFORMATION
DEVICE
REEL
SIZE
TAPE
WIDTH
ZXSC310E5TA
180mm
8mm
V_IN = 3.3V / 5V
V CC
V_DRIVE
S_TDN
I SENSE
Gnd
QUANTITY
PER REEL
3000
DEVICE MARKINGS
• C310
Package SOT23-5
ISSUE 3 - SEPTEMBER 2007
1
SEMICONDUCTORS