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PDF CAT3644 Data sheet ( Hoja de datos )
| Número de pieza | CAT3644 | |
| Descripción | 4-Channel Ultra High Efficiency LED Driver | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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CAT3644
4-Channel Ultra High
Efficiency LED Driver
Description
The CAT3644 is a high efficiency fractional charge pump that can
drive up to four LEDs programmable by a one 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/DIM logic input functions as a chip enable and a digital
dimming interface for current setting of all LEDs. Six different current
ratios are available via the interface.
The device is available in the tiny 16−pad TQFN 3 mm x 3 mm
package with a max height of 0.8 mm.
ON Semiconductor’s 1.33x charge pump switching architecture is
patented.
Features
• High Efficiency 1.33x Charge Pump
• Charge Pump: 1x, 1.33x, 1.5x, 2x
• Drives up to 4 LEDs at 25 mA Each
• 1−wire EZDim LED Current Programming
• 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
• 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
© Semiconductor Components Industries, LLC, 2014
August, 2014 − Rev. 8
1
http://onsemi.com
TQFN−16
HV3 SUFFIX
CASE 510AD
PIN CONNECTIONS
LED2
LED3
LED4
RSET
1
C2−
C2+
C1−
C1+
(Top View)
MARKING DIAGRAMS
JAAG
AXXX
YWW
JAAH
AXXX
YWW
JAAG = CAT3644HV3−T2
JAAH = CAT3644HV3−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
CAT3644HV3−T2
(Note 1)
CAT3644HV3−GT2
(Note 2)
Package
TQFN−16
(Pb−Free)
TQFN−16
(Pb−Free)
Shipping†
2000 /
Tape & Reel
1. Matte−Tin Plated Finish (RoHS−compliant).
2. NiPdAu Plated Finish (RoHS−compliant).
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
Publication Order Number:
CAT3644/D
1 page  
CAT3644
TYPICAL PERFORMANCE CHARACTERISTICS
(VIN = 3.6 V, IOUT = 80 mA (4 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
1x
80
1.33x
70 70
60 60
50
40
4.5
4.0 3.5 3.0 2.5
INPUT VOLTAGE (V)
Figure 3. Efficiency vs. Input Voltage
2.0
50
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
4
VF = 3.3 V
3
2
1
0
5.5 5.0
LEDs Off
4.5 4.0 3.5
3.0 2.5
2.0
INPUT VOLTAGE (V)
Figure 5. Quiescent Current vs. Input Voltage
4
3
2x
1.5x
2
1
1.33x
1x
0
−40 0
40 80 120
TEMPERATURE (°C)
Figure 6. Quiescent Current vs. Temperature
10
8 VF = 3.3 V
6
4
2
0
−2
−4
−6
−8
−10
2.0 2.5 3.0 3.5 4.0 4.5 5.0
INPUT VOLTAGE (V)
Figure 7. LED Current Change vs. Input
Voltage
5.5
10
8 VF = 3.3 V
6
4
2
0
−2
−4
−6
−8
−10
−40
0
40 80
TEMPERATURE (°C)
Figure 8. LED Current Change vs.
Temperature
120
http://onsemi.com
5
5 Page 
CAT3644
LED Current Selection
At power−up, the initial LED current is set to full scale
(100% brightness) by the external resistor RSET as follows:
LED current + 132
0.6 V
RSET
The EN/DIM pin has two primary functions. One function
enables and disables the device. The other function is LED
current dimming with six different levels by pulsing the
input signal, as shown on Figure 26. On each consecutive
pulse rising edge, the LED current is divided by half to 50%,
then 25%, 12.5%, 6.25% and 3.125% dimming levels.
Pulses faster than the minimum TLO may be ignored and
filtered by the device. Pulses longer than the maximum TLO
may shutdown the device.
The LED driver enters a “zero current” shutdown mode if
EN/DIM is held low for 1.5 ms or more.
TSETUP
THI
TPWRDWN
EN/DIM
TLED
LED
Current
Shutdown
100%
TLO
100%
50%
25% 12.5% 6.25% 3.12%
Figure 26. EN/DIM Digital Dimming Timing Diagram
Table 7. LED CURRENT DIMMING LEVELS
EN/DIM # of Pulses *
EN = High
RSET Gain
132
1st 66
2nd 33
3rd 16.5
4th 8.25
5th 4.125
6th 132
xth Device cycling through gain selection
* The gain is changed on the rising edges of the EN/DIM input.
Shutdown
LED Current
132 x 0.6 V / RSET
66 x 0.6 V / RSET
33 x 0.6 V / RSET
16.5 x 0.6 V / RSET
8.25 x 0.6 V / RSET
4.125 x 0.6 V / RSET
132 x 0.6 V / RSET
GAIN x 0.6 V / RSET
http://onsemi.com
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet CAT3644.PDF ] | |
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