Single or Multiple Cell Li-ion Battery Powered
4-Channel and 6-Channel LED Drivers
ISL97692, ISL97693, ISL97694A
The ISL97692, ISL97693, ISL97694A are Intersil’s highly
integrated 4- and 6-channel LED drivers for display
backlighting . These parts maximize battery life by featuring
only 1mA quiescent current, and by operating down to 2.4V
input voltage, with no need for higher voltage supplies.
The ISL97692 has 4 channels and provides 8-bit PWM
dimming with adjustable dimming frequency up to 30kHz. The
ISL97693 has 6 channels with Direct PWM dimming control.
The ISL97694A has 6 channels and provides 8-, 10-, or 12-bit
PWM dimming with adjustable dimming frequency up to
30kHz, 7.5kHz, or 1.875kHz, respectively, controlled with I
2
C
or PWM input.
ISL97692 and ISL97694A feature phase shifting that may be
enabled optionally, with a phase delay between channels
optimized for the number of active channels. In ISL97694A,
phase shifting can multiply the effective dimming frequency by
6 allowing above-audio PWM dimming with 10-bit dimming
resolution.
The ISL97692/3/4A employ adaptive boost architecture,
which keeps the headroom voltage as low as possible to
maximize battery life while allowing ultra low dimming duty
cycle as low as 0.005% at 100Hz dimming frequency in Direct
PWM mode.
The ISL97692/3/4A incorporate extensive protection
functions including string open and short circuit detections,
OVP, and OTP.
The ISL97692/3 are offered in the 16 Ld 3mmx3mm TQFN
package and ISL97694A is offered in the 20 Ld 3mmx4mm
TQFN package. All parts operate in ambient temperature
range of -40°C to +85°C.
Features
• 2.4V Minimum Input Voltage, No Need for Higher Voltage
Supplies
• 4 Channels, up to 40mA Each (ISL97692) or 6 Channels, up
to 30mA Each (ISL97693/4A)
• 90% Efficient at 6P5S, 3.7V and 20mA (ISL97693/4A)
• Low 0.8mA Quiescent Current
• PWM Dimming Control with Internally Generated Clock
- 8-bit Resolution with Adjustable Dimming Frequency up to
30kHz (ISL97692/4A)
- 12-bit Resolution with Adjustable Dimming Frequency up
to 1.875kHz (ISL97694A)
- Optional Automatic Channel Phase Shift (ISL97692/4A)
- Linear Dimming from 0.025%~100% up to 5kHz or
0.4%~100% up to 30kHz (ISL97692/4A)
• Direct PWM Dimming with 0.005% Minimum Duty Cycle at
100Hz
• ±2.5% Output Current Matching
• Adjustable Switching Frequency from 400kHz to 1.5MHz
Applications
• Tablet, Notebook PC and Smart Phone Displays LED
Backlighting
Related Literature
(Coming
Soon)
•
AN1733
“ISL97694A Evaluation Board User Guide”
•
AN1734
“ISL97693 Evaluation Board User Guide”
•
AN1735
“ISL97692 Evaluation Board User Guide”
10
VIN: 2.4V~5.5V
4.7µF
L1
10µH
D1
4.7µF 4.7µF
VOUT: 24.5V, 6 x 20mA
10
1
LX
100pF 470k
VIN
1µF
COMP
15nF
12k
OVP
2.2nF
23.7k
ISL97694A
ISET
ILED (mA)
0.1
53k
AGND
PGND
0.01
f
PWM
: 200Hz
SDA/PWMI
SCL
EN
FPWM
291k
FSW
143k
CH5
CH6
CH1
CH2
CH3
CH4
0.001
f
PWM
: 100Hz
0.0001
0.001
0.01
0.1
1
INPUT DIMMING DUTY CYCLE (%)
10
FIGURE 1. ISL97694A TYPICAL APPLICATION DIAGRAM
FIGURE 2. ULTRA LOW PWM DIMMING LINEARITY
July 19, 2012
FN7839.2
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 Inc. 2012. 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.
Analog electronics
京公网安备 11010802033920号
EEWORLD
