5
FN9044.2
August 9, 2006
Absolute Maximum Ratings Thermal Information
Supply Voltage (VCC_5V Pin) . . . . . . . . . . . . . . . . . . . .-0.3V to +7V
Input Voltage (V
IN
Pin). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+27V
BOOT1, 2 and UGATE1, 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . +35V
PHASE1, 2 and ISEN1, 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . +27V
BOOT1, 2 with Respect to PHASE1, 2 . . . . . . . . . . . . . . . . . . +6.5V
UGATE1, 2. . . . . . . . . . . . (PHASE1, 2 - 0.3V) to (BOOT1, 2 +0.3V)
Thermal Resistance (Typical) θ
JA
(°C/W) θ
JC
(°C/W)
28 Lead QFN (Note 1) . . . . . . . . . . . 36 5.5
Maximum Junction Temperature (Plastic Package) .-55°C to 150°C
Maximum Storage Temperature Range. . . . . . . . . . .-65°C to 150°C
Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to 85°C
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.
NOTE:
1. θ
JC
is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. For θ
JA
the “case temp” location is the center of the exposed metal pad on the underside of the package. See Tech Brief TB379.
Electrical Specifications Recommended operating conditions unless otherwise noted. Refer to Block Diagram and Typical Application
Schematic. V
IN
= 5.6V to 24V, or VCC_5V = 5V ±10%, T
A
= -40°C to 85°C (Note 2),
Typical values are at T
A
= 25°C
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
VIN SUPPLY
Input Voltage Range 5.6 12 24 V
VCC_5V SUPPLY (Note 3)
Input Voltage 4.5 5.0 5.6 V
Output Voltage V
IN
> 5.6V, I
L
= 20mA 4.5 5.0 5.5 V
Maximum Output Current V
IN
= 12V 60 - - mA
SUPPLY CURRENT
Shutdown Current (Note 4) SD1
= SD2 = GND - 50 375 μA
Operating Current (Note 5) - 2.0 4.0 mA
REFERENCE SECTION
Nominal Reference Voltage - 0.8 - V
Reference Voltage Tolerance -1.0 - 1.0 %
POWER-ON RESET
Rising VCC_5V Threshold 4.25 4.45 4.5 V
Falling VCC_5V Threshold 3.95 4.2 4.4 V
OSCILLATOR
Total Frequency Variation 260 300 340 kHz
Peak-to-Peak Sawtooth Amplitude (Note 6) V
IN
= 12V - 1.6 - V
V
IN
= 5V - 0.667 - V
Ramp Offset (Note 7) -1.0- V
SYNC Input Rise/Fall Time (Note 7) - - 10.0 ns
SYNC Frequency Range 4.16 4.8 5.44 MHz
SYNC Input HIGH Level 3.5 - - V
SYNC Input LOW Level --1.5V
SYNC Input Minimum Pulse Width (Note 7) 10 - - ns
SYNC Output HIGH Level V
CC
- 0.6V - - V
SHUTDOWN1/SHUTDOWN2
HIGH Level (Converter Enabled) Internal Pull-up (3μA) 2.0 - - V
LOW Level (Converter Disabled) - - 0.8 V
ISL6443
