FAN5702 Configurable 180mA, 6-Channel LED Driver with 12C Control for Mobile Handsets0 pages

August 2010
© 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN5702 • Rev. 1.0.3
FAN5702 — Configurable 180mA 6-LED Driver with I2C Control
FAN5702
Configurable 180mA 6-LED Driver with I2C Control
Features
.. Six (6) Parallel LEDs (up to 30mA Each)
.. Total Package Load Current Capability: 180mA
.. Group from 2 to 6 LEDs for Flexible Backlighting
.. I2C Interface for Easy Programming
.. >600:1 Dimming Ratio for 100Hz PWM Frequency
.. Logarithmically Controlled Dimming with 64 Steps
.. Secondary Brightness Control Using PWM Dimming
up to 20kHz in Conjunction with I2C Dimming
- Dynamic Backlight Control (DBC) to Reduce Current
Consumption
.. Up to 92% Efficiency
.. Built-in 1.5x Charge Pump with Low Drop-Out Bypass
Switch and automatic switching to 1x mode
.. 1.2MHz Switching Frequency for Small-Sized Capacitors
.. 16-Bump 1.6mm × 1.6mm WLCSP (0.6mm Height)
.. 16-Lead 3.0mm x 3.0mm UMLP (0.55mm Height)
Applications
.. LCD Backlighting
.. Mobile Handsets / Smartphones
.. Portable Media Players
Description
The FAN5702 is a highly integrated and configurable chargepump-
based multi-LED driver. The device can drive up to six
LEDs in parallel with a total output current of 180mA.
Regulated internal current sinks deliver excellent current and
brightness matching to all LEDs.
The FAN5702 has an I2C interface that allows the user to
independently control the brightness with a default grouping of
2,1,1,1,1 for a maximum of five independent lighting channels.
The LED driver can be programmed in a multitude of
configurations to address broad lighting requirements for
different platforms. Each LED can be configured through I2C
as five independent channels (Group A has two LEDs by
default) or any additional LEDs can join Group A to increase
the backlighting needs as the display size increases. The
device offers a second dimming control using the EN/PWM
pin. Applying a PWM dimming signal to this pin allows control
of the dimming of Group A LEDs so that the average current is
the linear value multiplied by the PWM dimming duty-cycle.
The device provides excellent efficiency, without an inductor,
by operating the charge pump in 1.5x or pass-through mode.
The FAN5702 can be ordered with default ISET values of
30mA, 20mA, 15mA, or 8mA. The default ISET is always
determined by the ISET ordered (see Ordering Information).
Ordering Information
Part Number LED Current
(ISET)
Temperature
Range Package Packing
FAN5702UC30X 30mA -40 to 85°C WLCSP-16, 0.4mm Pitch Tape and Reel
FAN5702UC20X 20mA -40 to 85°C WLCSP-16, 0.4mm Pitch Tape and Reel
FAN5702UC15X 15mA -40 to 85°C WLCSP-16, 0.4mm Pitch Tape and Reel
FAN5702UC08X 8mA -40 to 85°C WLCSP-16, 0.4mm Pitch Tape and Reel
FAN5702UMP30X 30mA -40 to 85°C UMLP-16, 3.0 x 3.0 x 0.55mm Tape and Reel
FAN5702UMP20X 20mA -40 to 85°C UMLP-16, 3.0 x 3.0 x 0.55mm Tape and Reel
FAN5702UMP15X 15mA -40 to 85°C UMLP-16, 3.0 x 3.0 x 0.55mm Tape and Reel
FAN5702UMP08X 8mA -40 to 85°C UMLP-16, 3.0 x 3.0 x 0.55mm Tape and Reel