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PDF CAT3616 Data sheet ( Hoja de datos )
| Número de pieza | CAT3616 | |
| Descripción | 6-Channel Charge Pump LED Driver | |
| Fabricantes | Catalyst Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CAT3616 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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6-Channel Charge Pump LED Driver
with EZDimTM
CAT3616
FEATURES
DESCRIPTION
6 LED channels with tight matching
Independent Main and Sub channels
1-wire EZDimTM Programmable LED Current
Accurate 1mA Dimming Level
Power efficiency up to 91%
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.
Fractional pump 1x/1.5x
Low noise input ripple
Fixed High Frequency Operation 1MHz
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
“Zero” Current Shutdown Mode
1x/1.5x fractional charge pump supports a wide range
Soft start and current limiting
of input voltages from 3V to 5.5V with efficiency up to
Short circuit protection
91%, and is ideal for Li-Ion battery powered devices.
Thermal shutdown protection
RoHS-compliant 16-lead Thin QFN 4mm x 4mm
package
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
APPLICATION
current from 1mA to 31mA with a 1mA step are set by
Main and sub-display backlight
Color LCD and keypad Backlighting
Cellular Phones
toggling the E¯N¯M¯ and E¯N¯¯S inputs. The enable EN
input pin allows to shutdown the device with zero
quiescentwww.DataSheet4U.com current.
Handheld Devices
Digital Cameras
The device is available in a 16-lead thin QFN package
with a max height of 0.8mm.
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)
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
1 page  
CAT3616
TYPICAL CHARACTERISTICS
VIN = 3.6V, IOUT = 90mA (6 LEDs at 15mA), EN = VIN, E¯N¯M¯ = E¯N¯¯S = GND, CIN = C1 = C2 = COUT = 1µF,
TAMB = 25ºC, 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
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 4.2
INPUT VOLTAGE [V]
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 4.2
INPUT VOLTAGE [V]
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc. No. 5018 Rev. A
5 Page 
APPLICATION INFORMATION
Single wire Dimming Application
The dimming control can be achieved through a single
wire interface by connecting together all three logic
input signals EN, E¯N¯M¯ and E¯N¯¯S as shown on Figure 3.
The common enable signal is set high to enable the
driver. On the first negative going pulse, the LEDs turn
CAT3616
full on. The pulse low state duration (between the
falling and rising edges) must be shorter than
0.5msec. Any consecutives pulses reduce the LED
current by 1mA. The enable signal is kept low for
more than 1.5msec to turn off all the LED channels
and set the driver in shutdown mode, as shown on
Figures 4.
Figure 3. Single Wire Dimming Control
Figure 4. Single Enable Timing Diagram
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
11
Doc. No. 5018 Rev. A
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet CAT3616.PDF ] | |
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