CAT3614 LED Datasheet

CAT3614 Datasheet PDF, Equivalent


Part Number

CAT3614

Description

4-Channel 1-Wire LED

Manufacture

Catalyst Semiconductor

Total Page 12 Pages
Datasheet
Download CAT3614 Datasheet


CAT3614
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4-Channel 1-Wire LED Driver in
3x3mm Package
CAT3614
FEATURES
„ Drives up to 4 LED channels
„ 1-wire EZDimTM 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
„ 12-lead TDFN 3mm x 3mm package
APPLICATIONS
„ LCD Display Backlight
„ Cellular Phones
„ Digital Still Cameras
„ Handheld Devices
DESCRIPTION
The CAT3614 is a high efficiency 1x/1.5x fractional
charge pump with programmable dimming current in
four 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 EN/DIM logic input provides a 1-wire EZDimTM
interface for dimming control of the LEDs. When
enabled, a series of clock pulses reduces the LED
brightness in 1mA steps on each negative going
edge. Currents from 0mA to 31mA are supported.
The device is available in the tiny 12-lead thin DFN
3mm x 3mm package with a max height of 0.8mm.
ORDERING INFORMATION
Part Number
CAT3614HS2-T2
CAT3614HV2-T2
Package
TDFN-12 3x3
TDFN-12 3x3 Green
Quantity
per Reel
2000
2000
Package
Marking
HAAB
HAAA
Pin Configuration
Top View
Typical Application Circuit
12-lead TDFN 3mm x 3mm
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Note: Unused LED channels must be connected to
VOUT.
1 Doc. No. 25095, Rev. 01

CAT3614
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CAT3614
ABSOLUTE MAXIMUM RATINGS
Parameter
Rating
VIN, LEDx voltage
6
VOUT, C1±, C2± voltage
7
EN/DIM voltage
VIN + 0.7V
Storage Temperature Range
-65 to +160
Junction Temperature Range
-40 to +125
Lead Temperature
300
Unit
V
V
V
°C
°C
°C
RECOMMENDED OPERATING CONDITIONS
Parameter
Range
Unit
VIN
3 to 5.5
V
Ambient Temperature Range
-40 to +85
°C
ILED per LED pin
Total Output Current
0 to 31
0 to 124
mA
mA
Typical application circuit with external components are shown on page 1.
ELECTRICAL OPERATING CHARACTERISTICS (over recommended operating conditions
unless specified otherwise) VIN = 3.6V, EN = High, ambient temperature of 25ºC.
Symbol Parameter
Conditions
Min Typ Max
IQ Quiescent Current
1x mode, no load
1.5x mode, no load
0.3 0.5
13
1
8
IQSHDN
ILED-ACC
ILED-DEV
ROUT
Shutdown Current
LED Current Accuracy
LED Channel Matching
Output Resistance (open loop)
VEN = 0V
1mA ILED 31mA
(ILED - ILEDAVG) / ILEDAVG
1x mode, IOUT = 100mA
1.5x mode, IOUT = 100mA
1
±3 ±8
±3 ±7
0.4 1
2.6 7
FOSC
ISC_MAX
Charge Pump Frequency
Output short circuit Current Limit VOUT < 0.5V
0.8 1 1.3
30 60 100
IIN_MAX
IEN/DIM
VHI
VLO
Input Current Limit
EN/DIM Pin
Input Leakage
Logic High Level
Logic Low Level
1x mode, VOUT > 1V
200 300 600
-1 1
1.3
0.4
TSD Thermal Shutdown
145 165 175
THYS
VUVLO
Thermal Hysteresis
Undervoltage lock out (UVLO)
threshold
10 20 30
1.7 2 2.4
Unit
mA
mA
µA
%
%
MHz
mA
mA
µA
V
V
ºC
ºC
V
Doc. No. 25095, Rev. 01
2 © 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice


Features www.DataSheet4U.com CAT3614 4-Channel 1-Wire LED Driver in 3x3mm Package FEAT URES „ „ „ „ „ „ „ „ „ „ „ Drives up to 4 LED channels 1-wire EZ DimTM Programmable LED Current Accurate 1mA Dimming Level Power efficiency up to 91% Fractional pump 1x/1.5x Low nois e input ripple Fixed High Frequency Ope ration 1MHz “Zero” Current Shutdown Mode Soft start and current limiting S hort circuit protection Thermal shutdow n protection 12-lead TDFN 3mm x 3mm pac kage DESCRIPTION The CAT3614 is a high efficiency 1x/1.5x fractional charge p ump with programmable dimming current i n four LED channels. To ensure uniform brightness in LCD backlight application s, each LED channel delivers an accurat e regulated current. Low noise and inpu t ripple is achieved by operating at a constant switching frequency of 1MHz wh ich allows the use of small external ce ramic capacitors. The 1x/1.5x fractiona l charge pump supports a wide range of input voltages from 3V to 5.5V with efficiency up to 91%, and is ideal for Li-I.
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