ISL6425 Datasheet, PDF (6/12 Pages) Intersil Corporation – Single Output LNB Supply and Control Voltage Regulator with I2C Interface for Advanced Satellite Set-top Box Designs

ISL6425
Electrical Specifications
V_CC
ENT
=
=
12V, T_A = -20°C to +85°C, unless otherwise noted. Typical values are at T_A = 25°C. EN = H, LLC =
L, DCL = L, DSQIN = L, I_OUT = 12mA, unless otherwise noted. See software description section for
L,
I²C
access to the system. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
LINEAR REGULATOR
Drop-Out Voltage
Iout = 450mA (Note 4)
-
1.2
-
V
DSQIN, SEL18V INPUT PINs (Note 6)
Asserted Low
-
-
0.8
V
Asserted HIGH
1.7
-
-
V
Input Current
-
1
-
µA
CURRENT SENSE
Input Bias Current
Overcurrent Threshold
I_BIAS
Static current mode, DCL = H
-
700
-
nA
325
400
500
mV
ERROR AMPLIFIER
Open Loop Voltage Gain
Gain Bandwidth Product
PWM
A_OL
(Note 4)
GBP
(Note 4)
70
88
-
dB
10
-
-
MHz
Maximum Duty Cycle
90
93
-
%
Minimum Pulse Width
(Note 4)
-
20
-
ns
OSCILLATOR
Oscillator Frequency
THERMAL PROTECTION
f_o
Fixed at (10)(f_tone)
200
220
240
kHz
Thermal Shutdown
Temperature Shutdown Threshold
(Note 4)
-
150
-
Temperature Shutdown Hysteresis
(Note 4)
-
20
-
NOTES:
3. Internal Digital Soft-start
4. Voltage programming signals VSEL and LLC are implemented via the I²C bus.
IO = 450mA.
5. Guaranteed by Design.
6. Unused DSQIN pin should be connected to GND. SEL18V pins is internally connected to GND by a 200K resistor.
6
FN9176.1
February 8, 2005