ISL6424 Datasheet, PDF (6/12 Pages) Intersil Corporation – Dual Output LNB Supply and Control Voltage Regulator with I2C Interface for Advanced Satellite Set-Top Box Designs

ISL6424
Electrical Specifications
V_CC = 12V, T_A = -20°C to +85°C, unless otherwise noted. Typical values are at T_A = 25°C. EN1 = EN2 = H,
LLC1 = LLC2 = L, ENT1 = ENT2 = L, DCL = L, DSQIN1 = DSQIN2 = L, Iout = 12mA, unless otherwise noted.
See software description section for I²C access to the system. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
22kHz TONE SECTION
Tone Frequency
Tone Amplitude
Tone Duty Cycle
Tone Rise or Fall Time
LINEAR REGULATOR
f_tone
V_tone
dc_tone
T_r, T_f
ENT1/2 = H
ENT1/2 = H
ENT1/2 = H
ENT1/2 = H
20.0
22.0
24.0
kHz
500
680
800
mV
40
50
60
%
5
8
14
µs
Drop-out Voltage
Iout = 750mA (Note 6)
-
1.2
-
V
DSQIN PIN 1&2, SEL18V 1&2 INPUT PINs (Note 11)
Asserted LOW
-
-
0.8
V
Asserted HIGH
1.7
-
-
V
Input Current
-
1
-
µA
CURRENT SENSE
Input Bias Current
Over Current 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 6)
GBP
(Note 6)
70
88
-
dB
10
-
-
MHz
Maximum Duty Cycle
90
93
-
%
Minimum Pulse Width
(Note 6)
-
20
-
ns
OSCILLATOR
Oscillator Frequency
THERMAL SHUTDOWN
f_o
Fixed at (10)(f_tone)
200
220
240
kHz
Temperature Shutdown Threshold
(Note 6)
-
150
-
Temperature Shutdown Hysteresis
(Note 6)
-
20
-
NOTES:
4. Internal digital soft-start.
5. VO1 for LNB1, VO2 for LNB2. Voltage programming signals VSEL1, VSEL2, LLC1, and LLC2 are implemented via the I²C bus.
IO1 = IO2 = 350mA/750mA.
6. Guaranteed by design.
7. Unused DSQIN 1&2 pins should be connected to GND. SEL18V1&2 pins have 200K internal pulldown resistors.
6
FN9175.3
September 13, 2005