isl8540 Intersil Corporation, isl8540 Datasheet - Page 2

• Manufacturer Part Number: isl8540
• Description: Dc/dc Power Switching Regulator
• Manufacturer: Intersil Corporation

Electrical Specifications
Absolute Maximum Ratings
Input Voltage VIN . . . . . . . . . . . . . . . . . . . . . . . . . GND -0.3V to 42V
Voltage at BOOT pin . . . . . . . . . . . . . . . . . . . . . . GND -0.3V to 49V
LX, RTCT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND -0.3V to 42V
REF, FB, SS, EN#, SYNC, PGOOD pins. . . . . . . . . . . . . . . . . . . .8V
VCC5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND -0.3V to 5.5V
Recommended Operating Conditions
Junction Temperature Range. . . . . . . . . . . . . . . . . .-40°C to +125°C
Supply Voltage Range (Typical). . . . . . . . . . . . . . . . . . . 9.0V to 40V
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.
*An accidental short between VCC5 and GND may cause excessive heating and permanent damage to the device.
NOTES:
VIN SUPPLY
Input Voltage Range
VIN SUPPLY CURRENT
Shut-down Current
Operating Current
VCC5 SUPPLY (A 1µF cap is needed from VCC5 to GND)
VCC5 Output Voltage
Maximum Output Current
INPUT UV
Rising UV Threshold
UV Threshold Hysteresis
BUCK CONVERTER
Output Voltage (Note 3)
Maximum Duty Cycle
Minimum Controllable ON Time
OSCILLATOR
Total Variation on Set Frequency
Frequency Range (Set by RTCT)
SYNC Range
Oscillation Frequency
1. θ
2. For θ
3. Additional heatsinking may be required to insure that junction temperature do not exceed above +125°C.
Tech Brief TB379.
JA
is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
JC
, the “case temp” location is the center of the exposed metal pad on the package underside.
PARAMETER
2
Unless otherwise specified the specifications listed in the table are tested at T
full Temperature Range, V
SYMBOL
f
f
f
IDD
IDD
OSC
OSC
OSC
V
V
V
V
V
V
I
F = 300kHz
F = 300kHz
Over the V
external resistor and capacitor at RTCT
V
V
OUT
IN
IN
IN
IN
IN
IN
IN
IN
IN
= 9V, EN = HIGH
= 40V, EN = HIGH
= 9V, V
= 40V, V
= 9.0V to 40V, I
= 24V
= 9V to 40V, R
= 9V to 40V, R
= 24V, V
= 2A
ISL8540
IN
FB
FB
TEST CONDITIONS
range with frequency set by
OUT
= 1.5V
= 1.5V
T
T
= 5.0V, I
Thermal Information
Thermal Resistance (Typical, Notes 1, 2) θ
Maximum Power Dissipation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3W
Maximum Junction Temperature (Hermetic Package or Die) . . +150°C
Maximum Junction Temperature (Plastic Package) . . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . . .-65°C to +150°C
Pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . .see link below
L
= 100kΩ, C
= 27.4kΩ, C
= 0mA to 5mA
HTSSOP Package . . . . . . . . . . . . . . . .
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
OUT
T
= 0A. Typical values are at T
T
= 1200pF
= 220pF
MIN
0.18
100
100
9.0
4.9
7.8
1.2
90
A
= +25°C and guard band for the
A
TYP
150
±10
725
3.6
6.0
5.0
0.3
24
35
60
96
60
= +25°C.
JA
(°C/W)
40
V
MAX
0.55
IN
600
600
110
8.0
5.1
8.9
40
60
September 18, 2007
4
5
- 5
θ
JC
UNITS
FN6495.4
2.5
(°C/W)
kHz
kHz
kHz
kHz
mA
mA
mA
μA
μA
ns
%
%
V
V
V
V
V