ISL6423 Datasheet, PDF (6/16 Pages) Intersil Corporation – Single Output LNB Supply and Control Voltage Regulator with I2C Interface for Advanced Satellite Set-Top Box Designs DiSEqC 2.0 Compatible

ISL6423
Electrical Specifications
V_CC =
VBOT
12V, T_A = -20°C to
= L, ENT = L, DCL
+85°C, unless otherwise
= L, Iout = 12mA, unless
noted. Typical values
otherwise noted. See
are at T_A
software
= +25°C. EN = H, VTOP
description section for I²C
access to the system. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
TONE OSCILLATOR
Tone Frequency
Tone Amplitude
Tone Duty Cycle
Tone Rise or Fall Time
TONE DECODER
f_tone
V_tone
dc_tone
T_r, T_f
ENT = H
ENT = H, I_O = 5mA
ENT = H
ENT = H
20.0
22.0
24.0
kHz
500
680
800
mV
40
50
60
%
5
10
14
μs
Input Amplitude
Vtdin
200
-
1000
mV
Frequency Capture Range
Ftdin
17.5
-
26.5
kHz
Input Impedance
Zdet
-
8.6
-
kΩ
Detector Output Voltage
Vtdout_L Tone Present, Iload = 3mA
-
-
0.4
V
Detector Output Leakage
Tone Decoder Rx Threshold
Tone Decoder Tx Threshold
LINEAR REGULATOR
Itdout_H
V_RXth
V_TXth
Tone absent, V_O = 6V
TXT = L & TTH = 0 (Note 9)
TXT = H & TTH = 0 (Note 9)
-
-
10
μA
100
150
200
mV
400
450
500
mV
Drop-out Voltage
Iout = 750mA
-
0.80
1.05
V
Output Backward Leakage Current
I_OBK
EN = 0; V_OBK = 27V
-
2.0
3.0
mA
Output Backward Leakage Current
I_OBK
EN = 0; V_OBK = 28V
-
15
17
mA
Output Backward Current Threshold
I_OBKTH EN = 1; V_OFAULT = 19V (Note 7)
-
125
-
mA
Output Backward Voltage
I_OBK
EN = 0
-
-
27
V
Output Undervoltage
(Asserted high during soft-start)
OUVF bit is asserted high, Measured from
-6
-
-2
%
the typical output set value
Output Overvoltage
(Asserted high during soft-start)
OUVF bit is asserted high, Measured from
+2
-
+6
%
the typical output set value
TXT, EXTM, SELVTOP AND ADDR 0/1 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
I_BIAS
V_CS
Static current mode, DCL = H
-
700
-
nA
325
450
500
mV
Open Loop Voltage Gain
A_OL
Gain Bandwidth Product
GBP
PWM
-
88
-
dB
-
14
-
MHz
Maximum Duty Cycle
90
93
-
%
Minimum Pulse Width
-
20
-
ns
OSCILLATOR
Oscillator Frequency
f_o
Fixed at (20)(f_tone)
396
440
484
kHz
6
FN9191.2
December 5, 2008