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PDF CAT3637 Data sheet ( Hoja de datos )
| Número de pieza | CAT3637 | |
| Descripción | 6-Channel Programmable High Efficiency Quad-Mode LED Driver | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CAT3637 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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CAT3637
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6-Channel Programmable
High Efficiency
Quad-Mode) LED Driver
Description
The CAT3637 is a high efficiency Quad−Mode fractional charge
pump that can drive up to six LEDs programmable by a 1−wire digital
interface. The inclusion of a 1.33x fractional charge pump mode
increases device efficiency by up to 10% over traditional 1.5x charge
pumps with no added external capacitors.
Low noise input ripple is achieved by operating at a constant
switching frequency which allows the use of small external ceramic
capacitors. The multi−fractional charge pump supports a wide range of
input voltages from 2.5 V to 5.5 V.
The EN/SET logic input functions as a chip enable and a digital
programming interface for setting the current in the LED channels.
The 1−wire pulse−programming interface supports 15 linear steps
from zero current to 30 mA full−brightness in 2 mA steps.
The device is available in a tiny 16−pad TQFN 3 x 3 mm package
with a maximum height of 0.8 mm.
ON Semiconductor’s Quad−Mode 1.33x, charge pump switching
architecture is patented.
Features
• High Efficiency 1.33x Charge Pump
• Quad−Mode Charge Pump: 1x, 1.33x, 1.5x, 2x
• Drives 6 LEDs Between 30 mA and 0 mA Each
• 1−wire EZDimt Interface with 2 mA Step
• Power Efficiency up to 92%
• Low Noise Input Ripple in All Modes
• “Zero” Current Shutdown Mode
• Soft Start and Current Limiting
• Short Circuit Protection
• Thermal Shutdown Protection
• Tiny 3 mm x 3 mm, 16−pad TQFN Package
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
• LCD Display Backlight
• Cellular Phones
• Digital Still Cameras
• Handheld Devices
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TQFN−16
HV3 SUFFIX
CASE 510AD
PIN CONNECTIONS
LED6
LED5
LED4
LED3
1
C2−
C2+
C1−
C1+
(Top View)
MARKING DIAGRAM
JAAM
AXXX
YWW
JAAM = CAT3637HV3−GT2
A = Assembly Location
XXX = Last Three Digits of Assembly Lot Number
Y = Production Year (Last Digit)
WW = Production Week (Two Digits)
ORDERING INFORMATION
Device
CAT3637HV3−GT2
(Note 1)
Package
TQFN−16
(Pb−Free)
Shipping
2,000/
Tape & Reel
1. NiPdAu Plated Finish (RoHS−compliant).
© Semiconductor Components Industries, LLC, 2010
April, 2010 − Rev. 3
1
Publication Order Number:
CAT3637/D
1 page  
CAT3637
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TYPICAL PERFORMANCE CHARACTERISTICS
(VIN = 3.6 V, IOUT = 120 mA (6 LEDs at 20 mA), CIN = COUT = C1 = C2 = 1 mF, TAMB = 25°C unless otherwise specified.)
100
VF = 3.3 V
90
1x
80
1.33x
1.5x
2x
100
VF = 3.3 V
90
80
VF = 3.0 V
70 70
60
50
40
4.5
4.0 3.5 3.0 2.5
INPUT VOLTAGE (V)
Figure 3. Efficiency vs. Input Voltage
2.0
60
Traditional 1.5x
50 Charge Pump
40
4.2
4.0 3.8
3.6 3.4
3.2
INPUT VOLTAGE (V)
Figure 4. Efficiency vs. Li−Ion Voltage
3.0
10
8 VF = 3.3 V
6
4
2
0
−2
−4
−6
−8
−10
5.5 5.0 4.5 4.0 3.5 3.0
INPUT VOLTAGE (V)
Figure 5. LED Current Change vs. Input
Voltage
6
VF = 3.3 V
5
2.5
10
8
6
4
2
0
−2
−4
−6
−8
−10
−40
−20 0
20 40
60
TEMPERATURE (°C)
Figure 6. LED Current Change vs.
Temperature
4
3
2
1
0
5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0
INPUT VOLTAGE (V)
Figure 7. Quiescent Current vs. Input Voltage
80
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5
5 Page 
CAT3637
LED Current Setting
The current in each of the six LED channels is
programmed through the 1−wire EN/SET digital control
input. At the initial power−up and once the EN/SET is set
high, the LED current remains at zero in all channels. On the
first EN/SET pulse (positive edge), the current is set to 2 mA
in all channels. On each consecutive pulse, the current is
incremented by 2 mA. On the 15th pulse, the current is equal
to the full scale of 30 mA. On the following pulse (16th
pulse), the current goes back to zero and the previous
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sequence can be repeated. The EN/SET pin can be pulsed at
high frequency 15 times to decrement the current by 2 mA
or to program the current from 0 mA to 30 mA. The
maximum EN/SET signal frequency for programming the
LED current is 2.5 MHz.
To power−down the device and turn−off all current
sources, the EN/SET input should be kept low for a duration
TOFF of 1.5 ms or more. The driver typically powers−down
with a delay of about 1 ms.
THI
EN/SET
LED
Current
Shutdown
TLO TOFF
TD 28 mA 30 mA
0 mA
2 mA 4 mA 6 mA
0 mA 2 mA
Figure 24. EN/SET One Wire Addressable Timing Diagram
Shutdown
Figure 25. EN/SET Program Increasing / Decreasing LED Current by 2 mA
http://onsemi.com
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet CAT3637.PDF ] | |
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