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PDF CAT3648 Data sheet ( Hoja de datos )
| Número de pieza | CAT3648 | |
| Descripción | 4-Channel Ultra High Efficiency LED Driver | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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CAT3648
4-Channel Ultra High
Efficiency LED Driver with
32 Dimming Levels
Description
The CAT3648 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 setting the current in all LED channels. The
1−wire pulse−dimming interface supports 32 linear steps from
full−scale down to zero current.
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 32 Linear Steps
• 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
http://onsemi.com
TQFN−16
HV3 SUFFIX
CASE 510AD
PIN CONNECTIONS
LED2
LED3
LED4
RSET
1
C2−
C2+
C1−
C1+
(Top View)
MARKING DIAGRAM
JAAN
AXXX
YWW
JAAN = CAT3648HV3−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
CAT3648HV3−GT2
(Note 1)
Package
TQFN−16
(Pb−Free)
Shipping†
2000 /
Tape & Reel
1. 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 Specifications
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2014
August, 2014 − Rev. 3
1
Publication Order Number:
CAT3648/D
1 page  
CAT3648
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
LEDs Off
0
5.5 5.0 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 
CAT3648
LED Current Selection
After power−up, the LED current is set by the external
resistor (RSET) value and the number of pulses (n) on the
EN/DIM input as follows:
ǒ ǓLED current + 125
0.6 V
RSET
31 * n
31
The full scale current is calculated from the above formula
with n equal to zero.
The EN/DIM pin has two primary functions. One function
enables and disables the device. The other function is LED
current dimming with 32 different levels by pulsing the input
signal, as shown on Figure 25. On each consecutive pulse
rising edge, the LED current is decreased by about 3.2%
(1/31th of the full scale value). After 30 pulses, the LED
current is 3.2% of the full scale current. On the 31st pulse, the
current drops to zero, and then goes back to full scale on the
following pulse.
Each pulse width should be between 200 ns and 100 ms.
Pulses faster than the minimum TLO may be ignored and
filtered by the device. Pulses longer than the maximum TLO
may shutdown the device. By pulsing the EN/DIM signal at
high frequency, the LED current can quickly be set to zero.
The LED driver enters a “zero current” shutdown mode if
EN/DIM is held low for 1.5 ms or more.
The dimming level is set by the number of pulses on the
EN/DIM after the power−up, as shown in Table 7.
EN/DIM
THI
Table 7. DIMMING LEVELS
Full Scale Current in %
100
97
94
90
87
84
81
77
74
71
68
65
61
58
55
52
48
45
42
39
35
32
29
26
23
19
16
13
10
6
3
0
100
Dimming Pulses [n]
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
TLED
LED
Current
Shutdown
TLO
100%
97% 94%
32 Levels
3% 0%
100%
TPWRDWN
Figure 25. EN/DIM Digital Dimming Timing Diagram
Shutdown
http://onsemi.com
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet CAT3648.PDF ] | |
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