ISL97692 Datasheet, PDF (1/28 Pages) Intersil Corporation – Single or Multiple Cell Li-ion Battery Powered 4-Channel and 6-Channel LED Drivers

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 I²C
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”
VIN: 2.4V~5.5V
10
1µF
15nF
12k
53k
4.7µF
L1
10µH
D1
VOUT: 24.5V, 6 x 20mA
4.7µF 4.7µF
VIN
COMP
LX
OVP
ISL97694A
ISET
AGND
PGND
100pF 470k
2.2nF ^23.7k
291k
143k
SDA/PWMI
SCL
EN
FPWM
FSW
CH1
CH2
CH3
CH4
CH5
CH6
FIGURE 1. ISL97694A TYPICAL APPLICATION DIAGRAM
10
1
0.1
0.01
0.001
f_PWM: 200Hz
f_PWM: 100Hz
0.0001
0.001
0.01
0.1
1
10
INPUT DIMMING DUTY CYCLE (%)
FIGURE 2. ULTRA LOW PWM DIMMING LINEARITY
July 19, 2012
1
FN7839.2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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