3
FN6474.1
February 22, 2008
Absolute Maximum Ratings (T
A
= +25°C) Thermal Information
VDD to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6V
V
OUT
to GND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 31V
LX to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V
OUT
+ 1V
VDDOUT, NSYNC, FB, NEN
to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VDD + 0.3V
Continuous Current in VDD, GND, VDDOUT, LX . . . . . . . . . 650mA
Continuous Current in NSYNC, FB, NEN . . . . . . . . . . . . . . . . 10mA
Thermal Resistance (Typical, Notes 1, 2)
JA
(°C/W)
JC
(°C/W)
10 Ld 3x3 DFN Package . . . . . . . . . . . 48 7
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . -65°C to +150°C
Ambient Operating Temperature (T
A
) . . . . . . . . . . . .-40°C to +85°C
Operating Junction Temperature (T
J
) . . . . . . . . . . . . . . . . . . +125°C
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . +130°C
Pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . .see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
NOTES:
1.
JA
is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
Tech Brief TB379.
2. For
JC
, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications V
DD
= 3.6V, GND = NEN = 0V, NSYNC = V
DD
, R
1
= 390k, R
2
= 39k, L = 10µH, T
A
= -40°C to +85°C unless
otherwise stated.
PARAMETER DESCRIPTION CONDITION MIN TYP MAX UNIT
SUPPLY
V
DD
Supply Operating Voltage Range 2.3 5.5 V
I
DIS
Supply Current when Disabled NEN = VDD 0.1 3 µA
LOGIC INPUTS – NEN, NSYNC
R
UP
Pull-up Resistor Enabled, Input at GND 150 250 350 k
I
IL
Leakage Current when Disabled Disabled, Input at GND -1 1 µA
VHI Logic High Threshold 1.8 V
VLO Logic Low Threshold 0.7 V
POWER-ON RESET – VDD
V
RES_ON
Power-On Reset Threshold V
DD
rising 2.2 2.3 V
V
RES_OFF
Power-Off Threshold V
DD
falling 1.9 2 V
LX OUTPUT DRIVER
f
OSC
LX Switching Frequency with Internal
Oscillator
0.9 1 1.1 MHz
f
SYNC
LX Switching Frequency when
Externally Synchronized at NSYNC
f
(NSYNC)
t
ON-MIN
Minimum On-Time FB = 0V, I(LX) > Ilim(LX) 60 ns
t
OFF-MIN
Minimum Off-time
( Maximum Duty Cycle)
FB = 0V, I(LX) < Ilim(LX) 60 ns
r
ON
LX ON-Resistance I(LX) = 100mA 0.4
I
LEAK
LX Leakage Current NEN = VDD, V(LX) = 30V 1 5 µA
I
PEAK
LX Peak Current Limit t > 8.32ms (end of soft-start) 1200 mA
SCHOTTKY DIODE – LX, V
OUT
V
DIODE
Forward Voltage from LX to V
OUT
I = 10mA, T
A
= +25°C 0.4 0.5 0.6 V
I = 10mA, T
A
= -40°C to +85°C 0.3 0.5 0.7 V
ISL97701
