ISL97631
Absolute Maximum Ratings (T A = 25°C)
Input Voltage (V IN ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6V
LX, Vout Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +27V
FB Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6V
ENAB Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6V
Operating Temperature . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C
Thermal Information
Thermal Resistance (Typical, Note 1) θ JA (°C/W)
6 Ld TSOT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190
Maximum Junction Temperature (Plastic Package . . . . . . . . . 150°C
Maximum Storage Temperature Range . . . . . . . . . .-65°C to +150°C
Maximum Lead Temperature (Soldering, 10s). . . . . . . . . . . . +300°C
(TSOT - Lead Tips Only)
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed over the specified temperature range. All parameters are based on pulsed tests,
therefore: T J = T C = T A
NOTE:
1. θ JA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
Electrical Specifications
V IN = 3V, V ENAB = 3V, T A = -40°C to 85°C unless otherwise specified.
PARAMETER
DESCRIPTION
CONDITION
MIN
TYP
MAX
UNIT
V IN-MIN
V IN-MAX
Minimum Operating Voltage
Maximum Operating Voltage
V OUT = 16V, I LED = 20mA
V OUT = 25V, I LED = 20mA
2.7
5.5
V
V
V FB
I FB
I IN
Feedback Voltage
FB Pin Bias Current
Supply Current
ENAB = 3V, output not switching
80
100
0.6
120
100
1.0
mV
nA
mA
ENAB = 0V
1
μA
F OSC
Switching Frequency
0.8
1.35
1.8
MHz
D MAX
Maximum Duty Cycle
T A = 25°C
85
90
%
82
90
%
I LIM
Switch Current Limit
T A = 25°C
280
350
mA
250
350
mA
r DS(ON)
Switch On Resistance
I LX = 100mA
750
m ?
I LEAK(LX)
I LEAK(VOUT)
V DIODE
Switch Leakage Current
Diode Leakage Current
LX-V OUT Diode Forward Voltage
V LX = 27V, Vout = 27V
V OUT = 27V
I DIODE = 100mA, T A = 25°C
0.01
0.01
0.75
1
1
0.9
μA
μA
V
V ENAB-HI
V ENAB-LO
I ENAB
ENAB Voltage High
ENAB Voltage Low
ENAB Pin Bias Current
2.5
0.6
1
V
V
μA
? I LED / ? V IN
Eff
Line Regulation
Efficiency
V IN = 2.7V to 5V
I LED = 20mA, 3 LEDs
0.2
85
%/V
%
2
FN7370.1
December 21, 2005
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