ISL6445 Datasheet, PDF (4/15 Pages) Intersil Corporation – 1.4MHz Dual, 180 Out-of-Phase, Step-Down PWM Controller

ISL6445
Absolute Maximum Ratings
Supply Voltage (VCC_5V Pin) . . . . . . . . . . . . . . . . . . . . -0.3V to +7V
Input Voltage (VIN 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 Information
Thermal Resistance (Typical)
θ_JA (°C/W)
24 Lead QSOP (Note 1). . . . . . . . . . . . . . . . . . . . . .
85
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
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.
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
Recommended operating conditions unless otherwise noted. Refer to “Block Diagram” on page 3 and “Typical
Application Schematic” on page 2. V_IN = 5.6V to 24V, or VCC5 = 5V ±10%, T_A = -40°C to +85°C, Typical values
are at T_A = +25°C. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise
specified. Temperature limits established by characterization and are not production tested.
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNITS
VIN SUPPLY
Input Voltage Range
5.6 12
24
V
VCC_5V SUPPLY (Note 2)
Input Voltage
4.5 5.0 5.6
V
Output Voltage
Maximum Output Current
SUPPLY CURRENT
V_IN > 5.6V, I_L = 20mA
V_IN = 12V
4.5 5.0 5.5
V
60
-
-
mA
Shutdown Current (Note 3)
SD1 = SD2 = GND
-
50
375
µA
Operating Current (Note 4)
-
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
1.25 1.4 1.55 MHz
Peak-to-Peak Sawtooth Amplitude (Note 5)
Ramp Offset (Note 6)
V_IN = 12V
V_IN = 5V
-
1.6
-
V
- 0.667 -
V
-
1.0
-
V
SHUTDOWN1/SHUTDOWN2
HIGH Level (Converter Enabled)
Internal Pull-up (3µA)
2.0
-
-
V
LOW Level (Converter Disabled)
-
-
0.8
V
PWM CONVERTERS
Output Voltage
-
0.8
-
V
FB Pin Bias Current
-
-
150
nA
Maximum Duty Cycle
PWM1, C_OUT = 1000p, T_A = +25°C
PWM2, C_OUT = 1000pF, T_A = +25°C
71
-
-
%
73
-
-
%
4
FN9230.1
June 3, 2008