ISL6423B Datasheet PDF - Intersil Corporation
| Part Number | ISL6423B | |
| Description | Single Output LNB Supply and Control Voltage Regulator | |
| Manufacturers | Intersil Corporation | |
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®
Data Sheet
April 10, 2007
ISL6423B
FN6412.1
Single Output LNB Supply and Control
Voltage Regulator with I2C Interface for
Advanced Satellite Set-Top Box Designs
The ISL6423B is a highly integrated voltage regulator and
interface IC, specifically designed for supplying power and
control signals from advanced satellite set-top box (STB)
modules to the low noise blocks (LNBs) of singe antenna
ports. The device consists of a current-mode boost PWM
and a low-noise linear regulator along with the circuitry
required for 22kHz tone generation, modulation and I2C
device interface. The device makes the total LNB supply
design simple, efficient and compact with low external
component count.
The current-mode boost converters provides the linear
regulator with input voltage that is set to the final output
voltages, plus typically 0.8V to insure minimum power
dissipation across each linear regulator. This maintains
constant voltage drop across the linear pass element while
permitting adequate voltage range for tone injection.
The final regulated output voltage is available at output
terminals to support the operation of an antenna port for
single tuners. The outputs for each PWM can be controlled
in two ways, full control from I2C using the VTOP and VBOT
bits or set the I2C to the lower range i.e., 13V/14V, and
switch to higher range i.e., 18V/19V, with the SELVTOP pin.
All the functions on this IC are controlled via the I2C bus by
writing 8 bits words onto the System Registers (SR). The
same register can be read back, and five I2C bits will report
the diagnostic status. Separate enable command sent on the
I2C bus provides for standby mode control for the PWM and
linear combination, disabling the output and forcing a shutdown
mode. The output channel is capable of providing 750mA of
continuous current. The overcurrent limit can be digitally
programmed to four levels.
The External modulation input EXTM can accept a
modulated Diseqc command and transfer it symmetrically to
the output. Alternatively the EXTM pin can be used to
modulate the continuos internal tone.
The FLT pin serves as an interrupt for the processor when
any condition turns OFF the LNB controller (Over
Temperature, Overcurrent, Disabled). The nature of the
Disable can be read of the I2C registers.
Features
• Single Chip Power solution
- Operation for 1-Tuner/1-Dish Applications
- Integrated DC/DC Converter and I2C Interface
• Switch-Mode Power Converter for Lowest Dissipation
- Boost PWMs with >92% Efficiency
- Selectable 13.3V or 18.3V Outputs
- Digital Cable Length Compensation (1V)
- I2C and Pin Controllable Output
• Output Back Bias Capability of 28V
• I2C Compatible Interface for Remote Device Control
• Registered Slave Address 0001 00XX
• 2.5V, 3.3V, 5V Logic Compatible
• External Pin to Toggle Between V and H Polarization
• Built-In Tone Oscillator Factory Trimmed to 22kHz
- Facilitates DiSEqC (EUTELSAT) Encoding
- External Modulation Input
• Internal Over-Temperature Protection and Diagnostics
• Internal OV, UV, Overload and Overtemp Flags
(Visible on I2C)
• FLT signal
• LNB Short-Circuit Protection and Diagnostics
• QFN, EPTSSOP Packages
• Pb-Free Available (RoHS Compliant)
Applications
• LNB Power Supply and Control for Satellite Set-Top Box
Ordering Information
PART
NUMBER*
PART
MARKING
TEMP.
(°C)
PACKAGE
PKG.
DWG. #
ISL6423BERZ 6423BERZ
(Note)
-20 to +85 24 Ld 4x4 QFN L24.4x4D
(Pb-free)
ISL6423BEVEZ ISL6423BEVEZ -20 to +85 28 Ld EPTSSOP M28.173B
(Note)
(Pb-free)
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100% matte
tin plate termination finish, which are RoHS compliant and compatible
with both SnPb and Pb-free soldering operations. Intersil Pb-free
products are MSL classified at Pb-free peak reflow temperatures that
meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
Add “-T” suffix for tape and reel.
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2006, 2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
|
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Absolute Maximum Ratings
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . 8.0V to 18.0V
Logic Input Voltage Range
(SDA, SCL, ENT, DSQIN 1 and 2, SEL18V 1 and 2) . -0.5V to 7V
Thermal Information
Thermal Resistance (Typical, Notes 2, 3) θJA (°C/W) θJC (°C/W)
QFN Package (Notes 2, 3) . . . . . . . . . .
38
4.5
EPTSSOP Package (Notes 2, 3) . . . . .
35
2.5
Maximum Junction Temperature (Note 4) . . . . . . . . . . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . . . -40°C to +150°C
Operating Temperature Range . . . . . . . . . . . . . . . . . -20°C to +85°C
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTES:
2. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
Tech Brief TB379.
3. For θJC, the "case temp" location is the center of the exposed metal pad on the package underside.
4. +150°C max junction temperature is intended for short periods of time to prevent shortening the lifetime. Operation close to +150°C junction may
trigger the shutdown of the device even before +150°C, since this number is specified as typical.
Electrical Specifications
VCC = 12V, TA = -20°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C. EN = H, VTOP
VBOT = L, ENT = L, DCL = L, IOUT = 12mA, unless otherwise noted. See software description section for I2C
access to the system.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNITS
Operating Supply Voltage Range
8 12 14
V
Standby Supply Current
EN = L
- 1.5 3.0 mA
Supply Current
UNDERVOLTAGE LOCKOUT
IIN EN = VTOP = VBOT = ENT = H, No Load
-
4.0 8.0
mA
Start Threshold
7.5 - 7.95 V
Stop Threshold
7.0 - 7.55 V
Start to Stop Hysteresis
350 400 500
mV
SOFT-START
COMP Rise Time (Note 5)
(Note 5)
- 8196 - Cycles
Output Voltage (Note 5)
Line Regulation
Load Regulation
Dynamic Output Current Limiting
VO1
VO1
VO1
VO1
DVO1,
DVO2
DVO1,
DVO2
IMAX
(Refer to Table 1)
(Refer to Table 1)
(Refer to Table 1)
(Refer to Table 1)
VIN = 8V to 14V; VO = 13.3V
VIN = 8V to 14V; VO = 18.3V
IO = 0mA to 350mA
IO = 0mA to 750mA
DCL = 0, ISEL H = 0, ISEL L = 0 (Note 8)
DCL = 0, ISEL H = 0, ISEL L = 1 (Note 8)
13.04 13.3 13.56
14.02 14.3 14.58
17.94 18.3 18.66
19.00 19.3 19.68
- 4.0 40.0
- 4.0 60.0
- 50 80
- 100 200
275 305 345
515 570 630
V
V
V
V
mV
mV
mV
mV
mA
mA
DCL = 0, ISEL H = 1, ISEL L = 0 (Note 8)
635 705 775
mA
DCL = 0, ISEL H = 1, ISEL L = 1 (Note 8)
800 890 980
mA
Dynamic Overload Protection Off Time TOFF DCL = 0, Output Shorted (Note 8)
- 900 -
ms
Dynamic Overload Protection On Time
TON
- 51 -
ms
Static Output Current Limiting
Cable Fault CABF Threshold
IMAX
ICAB
DCL = 1 (Note 8)
EN = 1, VO = 19V, No Tone.
- 1000 -
2 10 20
mA
mA
5 FN6412.1
April 10, 2007
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