DATA SHORT
To request the full datasheet, please visit
www.intersil.com/products/isl97900
ISL97900
RGB Buck-Boost 3-Channel Color Sequencing LED Driver
The ISL97900 is a highly efficient 3-channel, 1.5A sequential
LED driver powered from a single-cell Li-ion battery, or
regulated input voltage up to 5.5V. This LED driver incorporates
an independent current controlled driving mechanism for each
of the LED's, which allows accurate current control of the LED
brightness.
The ISL97900 utilizes a buck-boost converter to ensure that
optimum output voltage is maintained for a wide range of LED
forward voltages. The integrated buck-boost converter
operates well over 90% efficiency across a wide range of
operating conditions. The power conversion core implements a
proprietary algorithm that allows seamless transitions and
glitch-free operation between the buck and the boost modes
as the battery voltage drops during operation.
The ISL97900 architecture includes a 10-bit DAC, which
controls the LED currents. Each of the LED currents can be
programmed through serial interface.
The ISL97900 also includes the Dynamic Headroom
Management function to provide seamless adjustment for the
LEDs’ voltages, which reduces power consumption.
FN8372
Rev 0.00
November 19, 2012
Features
• Buck-boost based LED driver
• RGB color sequencing
• Up to 1.5A output current
• I
2
C Interface
• 150mV feedback voltage reference for current regulation to
maximize efficiency
• 2.5MHz switching frequency
• Programmable output voltage and output current for each
LED
• Dynamic headroom management
• Internal current setting registers
• Ambient temperature range: 0°C to +70°C
• Pb-free (RoHS compliant)
Applications
• LED-based pico projector in mobile phones
• Stand-alone pico projectors
• Tri-stimulus display drivers
• Other handheld display drivers
L
2
2.2µH
C
3
22µF 22µF
C
11
C
1
22µF
C
2
10µF
C
4
22µF
C
5
1µF 10µF
C
6
1.8V
28
27
PGND 26
24
LX2
PGND 25
PVIN
LX1
LED
1
1
PVIN
VOUT 22
LED1 21
LED2 20
2 ADDR
SCL
SDA
CEN
3
4
SCL
SDA
5 CEN
6 VCC
THERMAL
PAD
(GND)
LED3 19
NC 18
NC 17
FB 16
SGND 15
C
10
1µF 0.1µF
C
7
7
CBYP
11 GND
12 EN3
13 EN2
SGND
EN3
EN2
EN1
FIGURE 1. TYPICAL APPLICATION
FN8372 Rev 0.00
November 19, 2012
10 NC
14 EN1
LCoS
DRIVER ASIC
8 SGND
NC
R
1
0.1
9
Page 1 of 2
LED
2
LED
3
BATT
2.8V TO 4.3V
VOUT
23
ISL97900
© Copyright Intersil Americas LLC 2012. All Rights Reserved.
All trademarks and registered trademarks are the property of their respective owners.
For additional products, see
www.intersil.com/en/products.html
Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted
in the quality certifications found at
www.intersil.com/en/support/qualandreliability.html
Intersil products are sold by description only. Intersil may modify the circuit design and/or specifications of products at any time without notice, provided that such
modification does not, in Intersil's sole judgment, affect the form, fit or function of the product. Accordingly, the reader is cautioned to verify that datasheets are
current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its
subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see
www.intersil.com
FN8372 Rev 0.00
November 19, 2012
Page 2 of 2
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