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PDF ISL97634 Data sheet ( Hoja de datos )
| Número de pieza | ISL97634 | |
| Descripción | White LED Driver | |
| Fabricantes | Intersil Corporation | |
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White LED Driver with Wide PWM Dimming Range
ISL97634
The ISL97634 represents an efficient and highly integrated
PWM boost LED driver that is suitable for LED backlighting in
small size LCD panels. With integrated Schottky diode, OVP,
and wide range of PWM dimming capability, the ISL97634
provides a simple, reliable, and flexible solution to the
backlight designers.
The ISL97634 features a wide range of PWM dimming control
capability. It allows dimming frequency as low as DC to 32kHz
beyond audible spectrum. The ISL97634 also features a
feedback disconnect switch to prevent the output from being
modulated by the PWM dimming signal that minimizes system
disturbance.
The ISL97634 is available in the 8 Ld TDFN (2mmx3mm)
package. There are 14V, 18V, and 26V OVP options that are
suitable for various number of LEDs in series. The ISL97634 is
specified for operation over the -40°C to +85°C ambient
temperature at input voltage from 2.4V to 5.5V.
Related Literature
• See TB470, “Using the ISL97634 White LED Driver Demo
Board”
Features
•Drives Up to 26V Output
•Integrated over-voltage protection (OVP) of 14V, 18V, and
26V for various number of LEDs in series
• PWM Dimming Control From DC to 32kHz
• Output Disconnect Switch
• Integrated Schottky Diode
• 2.4V to 5.5V Input
• 85% Efficiency
• 1.4MHz Switching Frequency Allows Small LC
• 1µA Shutdown Current
• Internally Compensated
• 8 Ld TDFN (2mmx3mm)
• Pb-Free (RoHS Compliant)
Applications
• LED Backlighting for:
- Cell phones
- Smartphones
- MP3
- PMP
- Automotive Navigation Panel
- Portable GPS
10µH or 22µH
VIN
VIN
PWM/EN
NC
GND
LX
VOUT
FBSW
FB
FIGURE 1. TYPICAL APPLICATION CIRCUIT
August 27, 2013
FN6264.4
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2006-2008, 2011, 2013. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL97634
Typical Performance Curves
90
85
80
4 LEDs, 10µH
75
3 LEDs, 10µH
70 3 LEDs, 22µH
65
7 LEDs, 22µH
7 LEDs, 10µH
60 ILED_peak = 25mA
VIN = 4V
55 RSET = 4Ω
fPWM = 1kHz
50
0 20 40 60 80 100
PWM DUTY CYCLE (%)
FIGURE 2. EFFICIENCY vs PWM DUTY CYCLE
1.0
0.8
0.6
0.4
0.2
0.0
-0.2
01 23 456
VIN (V)
FIGURE 3. QUIESCENT CURRENT vs VIN (PWM/EN = HI)
20.08
20.04
20.00
19.96
19.92
0
5 10 15 20 25
VOUT (V)
FIGURE 4. LOAD REGULATION (VIN = 4V)
30
100
7 LEDs
90
VIN = 4V
80 RSET = 4Ω
70 L = 10µH
60
50
40
30
20
10
0
0 20
1kHz
20kHz
32kHz
40 60 80
DUTY CYCLE (%)
100 120
FIGURE 6. DIMMNG LINEARITY (FB VOLTAGE) vs DUTY CYCLE
5
19.76
19.74
19.72
19.70
19.68
19.66
19.64
19.62
2.5
3.0
3.5 4.0 4.5
5.0 5.5
VIN (V)
FIGURE 5. LINE REGULATION
VOUT
LX
VIN = 4V
R1 = 4Ω
L1 = 22µH
PWM/EN
ILED
FIGURE 7. PWM DIMMING AT 1kHz, D = 1%
FN6264.4
August 27, 2013
5 Page 
ISL97634
Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to web to make sure you
have the latest revision.
DATE REVISION
CHANGE
August 27,
2013
FN6264.4 Changed the information of "max 7 LED in series" to "up to 26V" for more accuracy.
Page 1:
In first paragraph, changed "PWM boost LED driver that is suitable for 1.8" to 3.5" LCDs that employ 2 to 7 white LEDs for
backlighting." to " PWM boost LED driver that is suitable for LED backlighting in small size LCD panels."
Added “Related Literature”
In “Features”, changed "OVP (14V, 18V, and 26V for 3, 4 and 7 LEDs Applications)" to "Integrated over-voltage protection (OVP)
of 14V, 18V, and 26V for various number of LEDs in series". Changed "Drives Up to 7 LEDs in Series (3.5V/20mA type)" to
"Drives Up to 26V Output"
Ordering Information on page 3
Added OVP Options column.
Updated Pb-free note to new verbiage based on lead finish.
Added note to Min Max column of spec table "Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless
otherwise specified. Temperature limits established by characterization and are not production tested."
Added "Boldface limits apply" verbiage to common conditions of spec table. Bolded applicable specs.
“Overvoltage Protection” on page 7, changed "The maximum numbers of LEDs.." to "The maximum LED current.."
Page 8, Table 1, deleted "MAX NO.OF LEDS" column
Page 9:
Changed section title from "8 LEDs Operation" to “Operation with VOUT above 26V”
In same section, changed first sentence from "For medium size LCDs that need more than 7 low power LEDs for backlighting,
such as a portable media player or automotive navigation panel displays, the voltage range.." to "For LED backlighting
applications that need an output voltage above 26V, the voltage range.."
Figure 17, changed inductance value from "2.2µH" to "10µH or 22µH"
Figure 17, changed figure title from "conceptual 8 LEDs high voltage driver" to "high voltage LED driver using a cascode".
Added “Revision History” and “About Intersil” on page 11.
Page 12:
Updated POD L8.2x3A to most recent rev. Updated format and added recommended land pattern
About Intersil
Intersil Corporation is a leader in the design and manufacture of high-performance analog, mixed-signal and power management
semiconductors. The company's products address some of the largest markets within the industrial and infrastructure, personal
computing and high-end consumer markets. For more information about Intersil, visit our website at www.intersil.com.
For the most updated datasheet, application notes, related documentation and related parts, please see the respective product
information page found at www.intersil.com. You may report errors or suggestions for improving this datasheet by visiting
www.intersil.com/en/support/ask-an-expert.html. Reliability reports are also available from our website at
http://www.intersil.com/en/support/qualandreliability.html#reliability
11 FN6264.4
August 27, 2013
11 Page | ||
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| PDF Descargar | [ Datasheet ISL97634.PDF ] | |
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