CAT3626 Driver Datasheet

CAT3626 Datasheet PDF, Equivalent


Part Number

CAT3626

Description

6-Channel LED Driver

Manufacture

Catalyst Semiconductor

Total Page 14 Pages
Datasheet
Download CAT3626 Datasheet


CAT3626
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CAT3626
6-Channel LED Driver with I2C Interface
FEATURES
„ Drives 6 LED channels
„ Independent current on 3 pairs of LEDs
„ I2C serial interface programming
„ Adjustable current to 32mA in 0.5mA step
„ 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
APPLICATION
„ RGB LEDs
„ LCD and keypad Backlighting
„ Cellular Phones, PDAs
„ Digital Cameras
ORDERING INFORMATION
Part Number Package Quantity Package
per Reel Marking
CAT3626HS4-T2 Thin QFN-16 2000 C626
CAT3626HV4-T2 Thin QFN-16 2000 G626
Green*
Note *: Matte Tin Lead Finish
PIN CONFIGURATION
PRODUCT DESCRIPTION
The CAT3626 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.
The LED channels are configured into three
independent pairs, each containing 2 matched
channels. Each pair can be separately programmed
from zero to 32mA, in 0.5mA resolution steps, using
the I2C serial interface. Any individual channel can
be disabled while others remain active. When the
enable input (EN) is low, the device is in shutdown
mode drawing zero current.
The device is available in a 16-lead thin QFN
package with a max height of 0.8mm.
TYPICAL APPLICATION CIRCUIT
QFN 16-lead 4x4mm
(Top View)
I2C is a trademark of Philips Electronics N.V.
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 3022 Rev. A

CAT3626
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CAT3626
ABSOLUTE MAXIMUM RATINGS
Parameter
VIN, LEDxx voltage
VOUT, C1±, C2± voltage
EN, SDA, SCL voltage
Storage Temperature Range
Junction Temperature Range
Lead Temperature
Rating
6
7
VIN + 0.7V
-65 to +160
-40 to +125
300
Unit
V
V
V
ºC
ºC
ºC
RECOMMENDED OPERATING CONDITIONS
Parameter
VIN
Ambient Temperature Range
LED forward voltage
ILED per LED pin
Range
3 to 5.5
-40 to +85
Up to 4.2
0 to 32
Unit
V
ºC
V
mA
Typical application circuit with external components are shown on page 1.
ELECTRICAL OPERATING CHARACTERISTICS
VIN = 3.6V, EN = High, ambient temperature of 25ºC (over recommended operating conditions unless specified
otherwise)
Symbol Parameter
Conditions
Min Typ Max Unit
IQ Quiescent Current
1x mode, all LEDs Off
0.5 mA
1x mode, all LEDs On
2.2 mA
1.5x mode, all LEDs Off 3.5 mA
IQSHDN Shutdown Current
VEN = 0V
0 1 µA
ILED LED Current Range with 6 LEDs
0 32 mA
ILED-ACC LED Current Accuracy
1mA ILED 31mA
±3 %
ILED-DEV
ROUT
LED Channel Matching
Output Resistance (open loop)
(ILED - ILEDAVG) / ILEDAVG
1x mode, IOUT = 120mA
1.5x mode, IOUT = 120mA
±3
0.5
2.8
%
FOSC
Charge Pump Frequency
0.8 1 1.3 MHz
ISC_MAX Output short circuit Current Limit VOUT < 0.5V
60 mA
IIN_MAX Input Current Limit
1x mode, VOUT > 1V
300 mA
EN Pin
IEN - Input Leakage
VHI - Logic High Level
VLO - Logic Low Level
-1
1.3
1 µA
V
0.4 V
TSD Thermal Shutdown
165 ºC
THYS
Thermal Hysteresis
20 ºC
VUVLO
Undervoltage lock out (UVLO)
threshold
2V
Doc. No. 5014 Rev. A
2 © 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice


Features www.DataSheet4U.com CAT3626 6-Channel LED Driver with I2C Interface FEATURES „ „ „ „ „ „ „ „ „ „ „ „ Dri ves 6 LED channels Independent current on 3 pairs of LEDs I2C serial interface programming Adjustable current to 32mA in 0.5mA step Power efficiency up to 9 1% Fractional pump 1x/1.5x Low noise in put ripple Fixed High Frequency Operati on 1MHz “Zero” Current Shutdown Mod e Soft start and current limiting Short circuit protection Thermal shutdown pr otection PRODUCT DESCRIPTION The CAT36 26 is a high efficiency 1x/1.5x fractio nal charge pump with programmable dimmi ng current in six LED channels. To ensu re uniform brightness in LCD backlight applications, each LED channel delivers an accurate regulated current. Low noi se and input ripple is achieved by oper ating at a constant switching frequency of 1MHz which allows the use of small external ceramic capacitors. The 1x/1.5 x fractional charge pump supports a wid e range of input voltages from 3V to 5.5V with efficiency up to 91%, and is ide.
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