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PDF ISL6421 Data sheet ( Hoja de datos )
| Número de pieza | ISL6421 | |
| Descripción | Single Output LNB Supply and Control Voltage Regulator with I2C Interface for Advanced Satellite Set-top Box Designs | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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®
Data Sheet
November 2003
ISL6421
FN9130
Single Output LNB Supply and Control
Voltage Regulator with I2C Interface for
Advanced Satellite Set-top Box Designs
The ISL6421 is a highly integrated solution for supplying
power and control signals from advanced satellite set-top
box (STB) modules to the low noise block (LNB). This device
is comprised of a current-mode boost PWM and a low-noise
linear regulator, along with the circuitry required for I2C
device interfacing and for providing DiSEqCTM standard
control signals to the LNB.
A regulated output voltage is available at the output terminal
(VOUT) to support the operation of the antenna port in
advanced satellite STB applications. The regulated output
may be set to either 13V or 18V by use of the voltage select
command (VSEL) through the I2C bus. Additionally, to
compensate for the voltage drop in the coaxial cable, the
voltage may be increased by 1V with the line length
compensation (LLC) feature. An enable command sent on
the I2C bus provides standby mode control for the PWM and
linear combination, disabling the output to conserve power.
A current-mode boost converter provides the linear regulator
with an input voltage that is set to the required output
voltage, plus 1.2V (typ.) to insure minimum power
dissipation. This maintains a constant voltage drop across
the linear pass element, while permitting an adequate
voltage range for tone injection.
The device is capable of providing 450mA (typ.).
Ordering Information
TEMP. RANGE
PART NUMBER
(oC)
PACKAGE
PKG.
DWG. #
ISL6421ER
-20 to 85 32 Ld 5x5 QFN L32.5x5
Features
• Switch-Mode Power Converter for Lowest Dissipation
- Boost PWM with >92% Efficiency
- Selectable 13V or 18V Outputs
- Digital Cable Length Compensation (1V)
• External Pin to Select 13V/18V Options
• I2C Compatible Interface for Remote Device Control
- Registered Slave Address 0001 00XX
- Fully Functional 3.3V, 5V Operation up to 400kHz
• Built-In Tone Oscillator Factory Trimmed to 22kHz
- Facilitates DiSEqC (EUTELSAT) Encoding
• Internal Over-Temperature Protection and Diagnostics
• Internal Overload and Overtemp Flags (Visible on I2C)
• LNB Short-Circuit Protection and Diagnostics
• QFN Package
- Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat
No Leads - Product Outline
- Near Chip-Scale Package Footprint
Applications
• LNB Power Supply and Control for Satellite Set-Top Box
References
• Tech Brief 389 (TB389) - “PCB Land Pattern Design and
Surface Mount Guidelines for QFN Packages”; Available
on the Intersil website, www.intersil.com
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2003. All Rights Reserved
1 page  
ISL6421
Electrical Specifications
VCC
ENT
=
=
12V, TA = -20oC to
L, DCL = L, DSQIN
+85oC, unless otherwise noted. Typical values are at TA = 25oC. EN
= L, IOUT = 12mA, unless otherwise noted. See software description
= H, LLC = L,
section for I2C
access to the system. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNITS
LINEAR REGULATOR
Drop-out Voltage
Iout = 450mA (Note 4)
- 1.2 -
V
DSQIN PIN
DSQIN pin logic Low
-
- 1.5V
V
DSQIN pin Logic HIGH
3.5 -
-
V
DSQIN pin Input Current
- 1 - µA
CURRENT SENSE
Current Limiting Threshold (max. input)
150 200 250
mV
Input Bias Current
Over Current Threshold
IBIAS
Static current mode, DCL = H
- 700 -
325 400 500
nA
mV
ERROR AMPLIFIER
Open Loop Voltage Gain
Gain Bandwidth Product
PWM
AOL (Note 4)
GBP (Note 4)
70 88
-
dB
10 -
- MHz
Maximum Duty Cycle
90 93
-
%
Minimum Pulse Width
(Note 4)
- 20 -
ns
OSCILLATOR
Oscillator Frequency
THERMAL PROTECTION
fo Fixed at (10)(ftone)
200 220 240
kHz
Thermal Shutdown
Temperature Shutdown Threshold
(Note 4)
- 150 -
Temperature Shutdown Hysteresis
(Note 4)
- 20 -
NOTES:
3. Internal Digital Soft-start
4. Voltage programming signals VSEL and LLC are implemented via the I2C bus.
IO = 450mA.
5. Guaranteed by Design.
5
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