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PDF CAT4139 Data sheet ( Hoja de datos )
| Número de pieza | CAT4139 | |
| Descripción | 22V High Current Boost White LED Driver | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CAT4139 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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CAT4139
22 V High Current Boost
White LED Driver
Description
The CAT4139 is a DC/DC step−up converter that delivers an
accurate constant current ideal for driving LEDs. Operation at a fixed
switching frequency of 1 MHz allows the device to be used with small
value external ceramic capacitors and inductor. LEDs connected in
series are driven with a regulated current set by the external resistor
R1. The CAT4139 is ideal for driving parallel strings of up to five
white LEDs in series or up to 22 V.
LED dimming can be done by using a DC voltage, a logic signal, or
a pulse width modulation (PWM) signal. The shutdown input pin
allows the device to be placed in power−down mode with “zero”
quiescent current.
In addition to thermal protection and overload current limiting, the
device also enters a very low power operating mode during “Open
LED” fault conditions. The device is housed in a low profile (1 mm
max height) 5−lead TSOT−23 package for space critical applications.
Features
• Switch Current Limit 750 mA
• Drives LED Strings up to 22 V
• Up to 87% Efficiency
• Low Quiescent Ground Current 0.6 mA
• 1 MHz Fixed Frequency Low Noise Operation
• Soft Start “In−rush” Current Limiting
• Shutdown Current Less than 1 mA
• Open LED Overvoltage Protection
• Automatic Shutdown at 1.9 V (UVLO)
• Thermal Overload Protection
• TSOT−23 5−Lead (1 mm Max Height)
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
• GPS Navigation Systems
• Portable Media Players
• Handheld Devices
www.onsemi.com
5
1
TSOT−23
TD SUFFIX
CASE 419AE
PIN CONNECTIONS
1
SW VIN
GND
FB SHDN
(Top View)
MARKING DIAGRAM
TPYM
TP = Specific Device Code
Y = Production Year (Last Digit)
M = Production Month
(1−9 (Jan−Sep), O, N, D (Oct−Dec))
ORDERING INFORMATION
Device
CAT4139TD−GT3
(Note 1)
Package
TSOT−23
(Pb−Free)
Shipping
3,000/
Tape & Reel
1. NiPdAu Plated Finish (RoHS−compliant)
© Semiconductor Components Industries, LLC, 2016
April, 2016 − Rev. 2
1
Publication Order Number:
CAT4139/D
1 page  
CAT4139
TYPICAL CHARACTERISTICS
(VIN = 5.0 V, IOUT = 180 mA, TAMB = 25°C, with typical application circuit unless otherwise specified.)
200 2.0
1.5
180
1.0
160 0.5
0
140 −0.5
120
100
3.0
3.5
4.0
4.5 5.0
5.5
INPUT VOLTAGE (V)
Figure 8. Output Current vs. Input Voltage
−1.0
−1.5
−2.0
4.5
4.7 4.9 5.1 5.3
INPUT VOLTAGE (V)
Figure 9. Output Current Regulation
5.5
95 95
90 90
IOUT = 120 mA
85 85
IOUT = 180 mA
80 80
75
80 100 120 140 160 180
OUTPUT CURRENT (mA)
Figure 10. Efficiency vs. Output Current
200
75
4.5
4.7 4.9
5.1 5.3
INPUT VOLTAGE (V)
Figure 11. Efficiency vs. Input Voltage
5.5
Figure 12. Power−up at 180 mA
Figure 13. Switching Waveform
www.onsemi.com
5
5 Page 
CAT4139
Board Layout
The CAT4139 is a high-frequency switching regulator.
The traces that carry the high-frequency switching current
have to be carefully laid out on the board in order to
minimize EMI, ripple and noise in general. The thicker lines
on Figure 26 show the switching current path. All these
traces have to be short and wide enough to minimize the
parasitic inductance and resistance. The loop shown on
Figure 26 corresponds to the current path when the
CAT4139 internal switch is closed. On Figure 27 is shown
the current loop, when the CAT4139 switch is open. Both
loop areas should be as small as possible.
Capacitor C1 has to be placed as close as possible to the
VIN pin and GND. The capacitor C2 has to be connected
separately to the top LED anode. A ground plane under the
CAT4139 allows for direct connection of the capacitors to
ground. The resistor R1 must be connected directly to the
GND pin of the CAT4139 and not shared with the switching
current loops and any other components.
L
VIN
D VOUT
VIN
L
D VOUT
SW
VIN
CAT4139
SHDN
Switch
Closed
FB
SW
VIN
CAT4139
SHDN
Switch
Open
FB
C1
GND
C2 R1 C1
GND
C2 R1
Figure 26. Closed−switch Current Loop
Figure 27. Open−switch Current Loop
Figure 28. Recommended PCB Layout
www.onsemi.com
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet CAT4139.PDF ] | |
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