ISL6422B Datasheet, PDF (7/18 Pages) Intersil Corporation – Dual Output LNB Supply and Control Voltage Regulator with I2C Interface for Advanced Satellite Set-Top Box Designs

ISL6422B
Electrical Specifications
V_CC = 12V, T_A = -20°C to +85°C, unless otherwise noted. Typical values are at T_A = +25°C. EN1/2 = H,
VTOP1/2 = L, VBOT1/2 = L,
software description section
fEoNr IT^{21C/2ac=cLe,sDs CtoLth=eLs,} yMsSteEmL.1/(²C⁼on^Lt^,in^IOu^Ue^Td)⁼
12mA,
unless
otherwise
noted.
See
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
TXT1/2, EXTM1/2, SELVTOP1/2 and ADDR0/1 INPUT PINs (Note 9)
Asserted LOW
-
-
0.8
V
Asserted HIGH
1.7
-
-
V
Input Current
-
25
-
μA
CURRENT SENSE (CS pin )
Input Bias Current
Overcurrent Threshold
ERROR AMPLIFIER
I_BIAS
V_CS
Static current mode, DCL = H
-
700
-
nA
325
450
500
mV
Open Loop Voltage Gain
Gain Bandwidth Product
PWM
A_OL
(Note 6)
GBP
(Note 6)
-
93
-
dB
-
14
-
MHz
Maximum Duty Cycle
90
93
-
%
Minimum Pulse Width
(Note 6)
-
20
-
ns
OSCILLATOR
Oscillator Frequency
Thermal Shutdown
f_o
Fixed at (20)(f_tone)
396
440
484
kHz
Temperature Shutdown Threshold
(Note 6)
-
150
-
Temperature Shutdown Hysteresis
(Note 6)
-
20
-
FLT
FLT (released)
V_O = 6V
-
-
10
μA
FLT (asserted)
I_SINK = 3.2mA (1.5k pull-up resistor to 5V)
-
-
0.4
V
NOTES:
5. Internal digital soft-start.
6. Limits established by characterization and are not production tested.
7. The EXTM1, EXTM2, SELVTOP1, SELVTOP2, TXT1, TXT2 and ADDR0, ADDR1 pins have 200k internal pull-downs
8. On exceeding this backward current limit threshold for a period of 2ms the device enters the backward dynamic current limit mode (350mA typ)
and the BCF I²C bit is set. The dynamic back current limit duty ratio during a BCF is ON = 2ms/OFF = 50ms. The output will remain clamped
to the fault output voltage till released. On removal of the fault condition the device returns to normal operation.
9. In the Dynamic current limit mode the output is ON for 51ms and OFF for 900ms. But remains continously ON in the Static mode. When tone is
ON the minimum current limit is 50mA lower the values indicated in the table.
7
FN6486.1
August 10, 2007