ISL6420B Datasheet, PDF (6/20 Pages) Intersil Corporation – Advanced Single Synchronous Buck Pulse-Width Modulation (PWM) Controller

ISL6420B
Absolute Maximum Ratings (Note 1)
Bias Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+30V
BOOT and UGATE Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +36V
Thermal Information
Thermal Resistance (Typical)
θ_JA (°C/W) θ_JC (°C/W)
QFN Package (Notes 2, 3). . . . . . . . . .
47
8.5
QSOP Package (Note 2) . . . . . . . . . . .
90
NA
Maximum Junction Temperature (Plastic Package) . . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . . .-65°C to +150°C
Ambient Temperature Range. . . . . . . . -40°C to +85°C (for “I” suffix)
Junction Temperature Range. . . . . . . . . . . . . . . . . .-40°C to +125°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. All voltages are with respect to GND.
2. θ_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.
3. For θ_JC, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications
Operating Conditions: V_IN = 12V, PV_CC shorted with V_CC5, 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
SYMBOL
TEST CONDITIONS
MIN
TYP MAX UNITS
VIN SUPPLY
Input Voltage Range
5.6
12
28
V
VIN SUPPLY CURRENT
Shutdown Current (Note 4)
ENSS = GND
-
1.4
-
mA
Operating Current (Notes 4, 5)
-
2.0
3.0
mA
VCC5 SUPPLY (Notes 5, 6)
Input Voltage Range
VIN = VCC5 for 5V configuration
4.5
5.0
5.5
V
Output Voltage
Maximum Output Current
VIN = 5.6V to 28V, I_L = 3mA to 50mA
VIN = 12V
4.5
5.0
5.5
V
50
-
-
mA
POWER-ON RESET
Rising V_CC5 Threshold
VIN connected to VCC5, 5V input
operation
4.310 4.400 4.475
V
Falling V_CC5 Threshold
UVLO Threshold Hysteresis
4.090 4.100 4.250
V
0.16
-
-
V
PWM CONVERTERS
Maximum Duty Cycle
Minimum Duty Cycle
FB Pin Bias Current
f_SW = 300kHz
f_SW = 300kHz
90
96
-
%
-
-
0
%
-
80
-
nA
Undervoltage Protection
Overvoltage Protection
OSCILLATOR
V_UV
Fraction of the set point; ~3µs noise filter 75
-
85
%
V_OVP Fraction of the set point; ~1µs noise filter 112
-
120
%
Free Running Frequency
Total Variation
RT = VCC5, T_A = -40°C to +85°C
270
300
330
kHz
T_A = -40°C to +85°C, with frequency set
-
±10%
-
%
by external resistor at RT
Frequency Range (Set by RT)
Ramp Amplitude (Note 7)
ΔV_OSC
VIN = 12V
100
-
1400
kHz
-
1.25
-
V_P-P
6
FN6901.0
April 27, 2009