ISL6445 Datasheet, PDF (5/15 Pages) Intersil Corporation – 1.4MHz Dual, 180 Out-of-Phase, Step-Down PWM Controller

ISL6445
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. (Continued)
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNITS
Minimum Duty Cycle
-
4
-
%
PWM CONTROLLER ERROR AMPLIFIERS
DC Gain (Note 6)
80 88
-
dB
Gain-Bandwidth Product (Note 6)
5.9
-
-
MHz
Slew Rate (Note 6)
-
2.0
-
V/µs
Maximum Output Voltage (Note 6)
0.9
-
-
V
Minimum Output Voltage (Note 6)
-
-
3.6
V
PWM CONTROLLER GATE DRIVERS (Note 7)
Sink/Source Current
-
400
-
mA
Upper Drive Pull-Up Resistance
VCC5 = 4.5V
-
8
-
Ω
Upper Drive Pull-Down Resistance
VCC5 = 4.5V
-
3.2
-
Ω
Lower Drive Pull-Up Resistance
VCC5 = 4.5V
-
8
-
Ω
Lower Drive Pull-Down Resistance
VCC5 = 4.5V
-
1.8
-
Ω
Rise Time
Fall Time
POWER GOOD AND CONTROL FUNCTIONS
C_OUT = 1000pF
C_OUT = 1000pF
-
18
-
ns
-
18
-
ns
PGOOD LOW Level Voltage
Pull-up = 100kΩ
-
0.1 0.5
V
PGOOD Leakage Current
-
-
±1.0 µA
PGOOD Upper Threshold, PWM 1 and 2
Fraction of set point
105
-
120
%
PGOOD Lower Threshold, PWM 1 and 2
Fraction of set point
80
-
95
%
ISEN and CURRENT LIMIT
Full Scale Input Current (Note 8)
-
32
-
µA
Overcurrent Threshold (Note 8)
ROCSET = 110kΩ
-
64
-
µA
OCSET (Current Limit) Voltage
-
1.75
-
V
SOFT-START
Soft-Start Current
-
5
-
µA
PROTECTION
Thermal Shutdown
Rising
-
150
-
°C
Hysteresis
-
20
-
°C
NOTES:
2. In normal operation, where the device is supplied with voltage on the V_IN pin, the VCC_5V pin provides a 5V output capable of 60mA (min).
When the VCC_5V pin is used as a 5V supply input, the internal LDO regulator is disabled and the V_IN input pin must be connected to the
VCC_5V pin. (Refer to the “Pin Descriptions” on page 8 for more details.)
3. This is the total shutdown current with VIN = VCC_5V = PVCC = 5V.
4. Operating current is the supply current consumed when the device is active but not switching. It does not include gate drive current.
5. The peak-to-peak sawtooth amplitude is production tested at 12V only; at 5V this parameter is guaranteed by design.
6. Limits should be considered typical and are not production tested.
7. Limits established by characterization and are not production tested.
8. Established by characterization. The full scale current of 32µA is recommended for optimum current sample and hold operation. See “Feedback
Loop Compensation” on page 11.
5
FN9230.1
June 3, 2008