isl6422b Intersil Corporation, isl6422b Datasheet - Page 7

• Manufacturer Part Number: isl6422b
• Description: Dual Output Lnb Supply And Control Voltage Regulator With I2c Interface For Advanced Satellite Set-top Box Designs
• Manufacturer: Intersil Corporation

Electrical Specifications
NOTES:
TXT1/2, EXTM1/2, SELVTOP1/2 and ADDR0/1 INPUT PINs (Note 9)
Asserted LOW
Asserted HIGH
Input Current
CURRENT SENSE (CS pin )
Input Bias Current
Overcurrent Threshold
ERROR AMPLIFIER
Open Loop Voltage Gain
Gain Bandwidth Product
PWM
Maximum Duty Cycle
Minimum Pulse Width
OSCILLATOR
Oscillator Frequency
Thermal Shutdown
Temperature Shutdown Threshold
Temperature Shutdown Hysteresis
FLT
FLT (released)
FLT (asserted)
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)
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
and the BCF I
to the fault output voltage till released. On removal of the fault condition the device returns to normal operation.
ON the minimum current limit is 50mA lower the values indicated in the table.
PARAMETER
2
C bit is set. The dynamic back current limit duty ratio during a BCF is ON = 2ms/OFF = 50ms. The output will remain clamped
7
V
VTOP1/2 = L, VBOT1/2 = L, ENT1/2 = L, DCL = L, MSEL1/2 = L, I
software description section for I
CC
= 12V, T
SYMBOL
I
V
A
GBP
BIAS
f
CS
OL
o
A
= -20°C to +85°C, unless otherwise noted. Typical values are at T
Static current mode, DCL = H
(Note 6)
(Note 6)
(Note 6)
Fixed at (20)(f
(Note 6)
(Note 6)
V
I
SINK
O
= 6V
= 3.2mA (1.5k pull-up resistor to 5V)
ISL6422B
2
TEST CONDITIONS
C access to the system. (Continued)
tone
)
OUT
MIN
325
396
1.7
90
-
-
-
-
-
-
-
-
-
-
= 12mA, unless otherwise noted. See
TYP
700
450
440
150
A
25
93
14
93
20
20
-
-
-
-
= +25°C. EN1/2 = H,
MAX
500
484
0.8
0.4
10
-
-
-
-
-
-
-
-
-
August 10, 2007
UNITS
MHz
kHz
mV
FN6486.1
μA
nA
dB
μA
ns
%
V
V
V