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| ISL6422 Datasheet, PDF (7/19 Pages) Intersil Corporation – Dual Output LNB Supply and Control Voltage Regulator with I2C Interface for Advanced Satellite Set-Top Box Designs | |||
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ISL6422
Electrical Specifications
VCC = 12V, TA = -20°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C. EN1 = EN2 = H,
VTOP1 = VTOP2 = L, ENT1 =
noted. See âISL6422 Software
ENT2 = L, DCL
Descriptionâ on
= L, DSQIN1 = DSQIN2 =
page 12 for I2C access to
L, IOUT = 12mA, unless otherwise
the system. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
TXT1 AND TXT2, EXTM1 AND EXTM2, SELVTOP1 AND SELVTOP2, ADDR0 AND ADDR1 INPUT PINs (Note 8)
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
IBIAS
VCS
Static current mode, DCL = H
700
nA
325
450
500
mV
Open Loop Voltage Gain
AOL
Gain Bandwidth Product
GBP
PWM
88
dB
14
MHz
Maximum Duty Cycle
90
93
%
Minimum Pulse Width
20
ns
OSCILLATOR
Oscillator Frequency
Thermal Shutdown
fo
Fixed at (20) (ftone)
396
440
484
kHz
Temperature Shutdown Threshold
150
°C
Temperature Shutdown Hysteresis
20
°C
FLT
FLT (released)
FLT (asserted)
VO = 6V
ISINK = 3.2mA (1.5k pull-up resistor to 5V)
10
µA
0.4
V
NOTES:
5. Internal digital soft-start.
6. The EXTM1 and EXTM2, SELVTOP1 and SELVTOP2, TXT1 and TXT2, and ADDR0 and ADDR1 pins have 200k internal pull-downs.
7. On exceeding this dynamic back current limit threshold for a period of 100µs, the device enters the dynamic current limit mode, and the BCF I2C
bit is set. The dynamic back current limit duty during a BCF is ON = 100µs or OFF = 5ms.
8. In the dynamic back current limit mode, the output is ON for 20ms and OFF for 900ms, but remains continuously ON in the Static mode. When
tone is ON, the minimum current limit is 50mA lower than the values indicated in the table. While in the dynamic mode of current limit, the trip
level is momentarily increased to 990mA during the 20ms ON time to facilitate recovery from overload conditions.
7
FN9190.1
April 10, 2007
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