CAT3637 Datasheet PDF - ON Semiconductor
| Part Number | CAT3637 | |
| Description | 6-Channel Programmable High Efficiency Quad-Mode LED Driver | |
| Manufacturers | ON Semiconductor | |
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CAT3637
www.DataSheet4U.com
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
http://onsemi.com
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
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CAT3637
www.DataSheet4U.com
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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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for CAT3637 electronic component. |
| Information | Total 14 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ CAT3637.PDF Datasheet ] | |
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Featured Datasheets
| Part Number | Description | MFRS |
| CAT3636 | The function is 6-Channel LED Driver. Catalyst Semiconductor |  |
| CAT3637 | The function is 6-Channel Programmable High Efficiency Quad-Mode LED Driver. ON Semiconductor | |
| CAT3637 | The function is 6-Channel Programmable High Efficiency Quad-Mode LED Driver. Catalyst Semiconductor | |
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