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PDF CAT3604V Data sheet ( Hoja de datos )
| Número de pieza | CAT3604V | |
| Descripción | 4-Channel Quad-Mode LED Driver | |
| Fabricantes | Catalyst Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CAT3604V (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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CAT3604V
4-Channel Quad-Mode™ LED Driver
with Open/Short LED Detection
www.datasheet4u.com
FEATURES
Quad-mode charge pump: 1x, 1.33x, 1.5x, 2x
Drives up to 4 LEDs at 30mA each
Pin compatible with industry standard ‘604
Open/short LED automatic detection
Power efficiency up to 92%
High resolution PWM dimming
Low noise supply ripple in all modes
Soft start and current limiting
Short circuit and thermal overload protection
16-Pad TQFN package, 4mm x 4mm
APPLICATION
LCD Display Backlight
Cellular Phones
Digital Still Cameras
Handheld Devices
ORDERING INFORMATION
Part Number
CAT3604VHV4-GT2
CAT3604VHV4-T2
Package Qty per Reel Marking
TQFN-16(1)
4 x 4mm
2000
CDAK
TQFN-16
4 x 4mm
2000
CDAF
Note:
(1) NiPdAu Plated Finish, RoHS compliant
For other finishes, please contact factory
For Ordering Information details, see page 14.
DESCRIPTION
The CAT3604V is a high efficiency Quad-ModeTM
fractional charge pump that can drive up to four LEDs
with input supply voltages as low as 2.5V.
An external RSET resistor is used to control the LED
channel brightness while channel diagnostics include
automatic detection for both short and open LED
channel conditions, ensuring the CAT3604V maintains
the highest efficiency level in all operating modes.
Each operating mode uses a constant high frequency
switching scheme which allows the use of small form
factor external ceramic capacitors while delivering
excellent low noise input supply ripple up to 5.5 volts.
The EN input control supports direct PWM dimming
and can accommodate dimming frequencies in excess
of 10kHz thereby providing extremely high resolution
brightness levels.
The device is available in the 16-pad low profile
0.8mm thin QFN (4mm x 4mm).
PIN CONFIGURATION
LED1 LED2 LED3 LED4
16 15 14 13
EN 1
12 GND
NC 2
NC 3
GND
11 C2+
10 C2-
NC 4
567
RSET VOUT VIN
8
C1+
9 C1-
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
TYPICAL APPLICATION CIRCUIT
1µF 1µF
VIN
2.4V CIN
to
5.5V
1µF
ON OFF
4.02kΩ
C1+
VIN
C1- C2+ C2-
VOUT
EN
RSET
CAT3604V
GND
LED1
LED2
LED3
LED4
VOUT
COUT
1µF
20mA
1 Doc. No. MD-5029, Rev. B
1 page  
CAT3604V
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.6V, IOUT = 80mA (4 LEDs at 20mA), CIN = COUT = C1 = C2 = 1μF, TAMB = 25°C unless otherwise specified.
Switching Frequency vs. Temperature
www.datasheet4u.com
1.3
1.2
1.1
1.5x Mode
Output Resistance vs. Input Voltage
12
10 2x
8
1.0
0.9
0.8
0.7
-40
1.33x, 2x Mode
0 40 80
TEMPERATURE [°C]
120
6
1.5x
4
1.33x
2 1x
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE [V]
Foldback Current Limit
4.0
3.5 1x Mode
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0
100 200 300 400
OUTPUT CURRENT [mA]
LED Current vs. RSET Resistance
100
LED Current vs. LED Pin Voltage
40
30
20
10
0
0 50 100 150 200 250 300
LED PIN VOLTAGE [mV]
Line Transient Response (3.6V to 4.9V)
10
1
1 10 100
RSET RESISTANCE [kΩ]
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
5
Doc. No. MD-5029, Rev. B
5 Page 
CAT3604V
PWM DIMMING
The EN pin is used to provide total Shutdown of the
device as well as High Resolution PWM dimming
control on the LED Channels.
www.datSashhuetedt4ouw.cnomof the device occurs after the EN pin has
been held low for 1.5ms. During the “soft-start” power-
up sequence from the shutdown mode, the LED
current typically settles within 40µs (for 1X mode
operation). This LED current settling time becomes
400µs if 1.33X operation is needed (i.e low battery
voltage).
For High Resolution PWM dimming control (typically
frequencies at 2kHz or above), the device will remain
powered and only the LED channels output will be
switched on and off during the PWM (the rest of the
device will remain powered-up). This allows the output
channels to have “instant-on” response, where the
LED current settles within 1µs of the applied PWM
dimming signals. This “instant-on” modes makes the
device suitable for extremely high frequency PWM
dimming schemes.
Figure 5 shows the output current for PWM frequencies
up to 100kHz and with duty cycles of 30% and 70%.
100
90
80 70% DC
70
60
50
40
30
20 30% DC
10
0.1 1 10 100
PWM FREQUENCY [kHz]
Figure 5. Output current vs. PWM frequency
For best performance, the duty cycle off-time TOFF
should meet the following timing limits:
for slow frequency ≤ 600Hz, TOFF ≥ 800µs
for fast frequency ≥ 1kHz, TOFF ≤ 400µs
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
11
Doc. No. MD-5029 Rev. B
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet CAT3604V.PDF ] | |
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