CAT3616 Datasheet, PDF (1/14 Pages) Catalyst Semiconductor – 6-Channel Charge Pump LED Driver with EZDimTM

6-Channel Charge Pump LED Driver
with EZDim^TM
CAT3616
FEATURES
„ 6 LED channels with tight matching
„ Independent Main and Sub channels
„ 1-wire EZDim^TM Programmable LED Current
„ Accurate 1mA Dimming Level
„ Power efficiency up to 91%
„ Fractional pump 1x/1.5x
„ Low noise input ripple
„ Fixed High Frequency Operation 1MHz
„ “Zero” Current Shutdown Mode
„ Soft start and current limiting
„ Short circuit protection
„ Thermal shutdown protection
„ RoHS-compliant 16-lead Thin QFN 4mm x 4mm
package
APPLICATION
„ Main and sub-display backlight
„ Color LCD and keypad Backlighting
„ Cellular Phones
„ Handheld Devices
„ Digital Cameras
ORDERING INFORMATION
Part
Number
Package
CAT3616HV4 Thin QFN-16
Green*
*Lead Finish Matte-Tin
Quantity
per Reel
2000
Package
Marking
G616
For Ordering Information details, see page 13.
PIN CONFIGURATION
TQFN 16-lead 4x4mm (Top view)
DESCRIPTION
The CAT3616 is a high efficiency 1x/1.5x fractional
charge pump with programmable dimming current in
six LED channels. To ensure uniform brightness in
LCD backlight applications, each LED channel
delivers an accurate regulated current.
Low noise and input ripple is achieved by operating at
a constant switching frequency of 1MHz which allows
the use of small external ceramic capacitors. The
1x/1.5x fractional charge pump supports a wide range
of input voltages from 3V to 5.5V with efficiency up to
91%, and is ideal for Li-Ion battery powered devices.
Two groups of LEDs, main (MAIN1 to MAIN4) and sub
(SUB1 and SUB2) are programmable through the
E¯N¯M¯ (active low) and E¯N¯¯S inputs. Independent
current from 1mA to 31mA with a 1mA step are set by
toggling the E¯N¯M¯ and E¯N¯¯S inputs. The enable EN
input pin allows to shutdown the device with zero
quiescent current.
The device is available in a 16-lead thin QFN package
with a max height of 0.8mm.
TYPICAL APPLICATION CIRCUIT
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Note: Unused LED channels must be connected to VOUT.
1
Doc. No. 5018 Rev. A