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PDF CAT3614 Data sheet ( Hoja de datos )
| Número de pieza | CAT3614 | |
| Descripción | 4-Channel 1-Wire LED | |
| Fabricantes | Catalyst Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CAT3614 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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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
1 page  
www.DataSheet4U.com
CAT3614
Typical Characteristics
VIN = 3.6V, IOUT = 80mA (4 LEDs at 20mA), C1 = C2 = CIN = COUT = 1µF, TAMB = 25°C unless otherwise specified.
LED Current Change vs. Input Voltage
5.0
4.0
3.0
2.0 1x Mode
1.0
0.0
-1.0
-2.0 1.5x Mode
-3.0
-4.0
-5.0
3.0
3.2 3.4 3.6 3.8 4.0
INPUT VOLTAGE [V]
4.2
LED Current Change vs. Temperature
5.0
4.0
3.0
2.0
1.0
0.0
-1.0
-2.0
-3.0
-4.0
-5.0
-40
-20 0 20 40 60
TEMPERATURE [°C]
80
Oscillator Frequency vs. Input Voltage
1.3
1.2
1.1
1.0
4 LEDs at 20mA
0.9
0.8
0.7
3.0
3.2 3.4 3.6 3.8
INPUT VOLTAGE [V]
4.0
Oscillator Frequency vs. Temperature
1.3
1.2
1.1
1.0
0.9
0.8
0.7
-40
0 40 80
TEMPERATURE [°C]
120
Output Resistance vs. Input Voltage (1x mode)
1.0
0.8
0.6
0.4
0.2
0.0
3.0
3.2 3.4 3.6 3.8 4.0
INPUT VOLTAGE [V]
4.2
Output Resistance vs. Input Voltage (1.5x mode)
4.0
3.5
3.0
2.5
2.0
1.5
1.0
3.0
3.2 3.4 3.6 3.8 4.0
INPUT VOLTAGE [V]
4.2
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc. No. 25095, Rev. 01
5 Page 
www.DataSheet4U.com
PACKAGE DRAWING AND DIMENSIONS
Thin DFN 12-Lead 3mm X 3mm, 0.45mm Pitch
CAT3614
RECOMMENDED LAND PATTERN
Dimensions in millimeters
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
11
Doc. No. 25095, Rev. 01
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet CAT3614.PDF ] | |
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