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PDF MP8126DF Data sheet ( Hoja de datos )
| Número de pieza | MP8126DF | |
| Descripción | LNB-Power Supply and Control-Voltage Regulator | |
| Fabricantes | MPS | |
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MP8126
550mA, 8V-to-14V Input, LNB-Power Supply
and Control-Voltage Regulator
The Future of Analog IC Technology
DESCRIPTION
The MP8126 is a voltage regulator designed to
provide efficient, low-noise power to a satellite
receiver’s RF LNB (Low Noise Block) converter.
It connects using a coaxial cable through a link
that is compatible with the European
EUTELSAT specification (DiSEqC) 1.x that
receives instructions from a dedicated controller.
The MP8126 integrates a current-mode boost
regulator followed by a tracking linear regulator.
The boost regulator provides a clean and quiet
power source that will not contaminate the low-
noise RF signal as it is down-converted to the
receiver. The tracking linear regulator protects
the output against overloads or shorts.
The MP8126 provides a number of features
described in the DiSEqC, including voltage
selection of horizontal or vertical LNB
polarization directions, and selectable VOUT
compensation for substantial voltage drops on
long coaxial cable. In accordance with DiSEqC,
the part can detect a 22kHz signal and output a
shaped signal.
The MP8126 is available in a thermally-
enhanced TSSOP16EP and 24-pin QFN
(4X4mm) packages.
FEATURES
• DiSEqC 1.x Compatibility
• Up to 550mA Output Current
• Programmable Current Limit
• 8V-to-14V Input Voltage
• Boost Converter with Internal Switch
• Low-Noise LDO Output
• Built-In 22kHz Signal Shaper
• 1V Line-Drop Compensator
• Adjustable Soft-Start Time
• POK Indicator
• Short-Circuit Protection
• Over-Temperature Protection
• TSSOP16 Exposed Pad and 24-pin QFN
(4X4mm) Packages
APPLICATIONS
• LNB Power Supply and Control for Satellite
Set Top Boxes
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit the MPS website under Products, Quality Assurance.
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
MP8126 Rev. 1.03
www.MonolithicPower.com
3/28/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
1
1 page  
MP8126 – LNB POWER SUPPLY AND CONTROL VOLTAGE REGULATOR
PIN FUNCTIONS
Pin #
TSSOP-16
1
2
3
Pin #
QFN24
22
23, 24
2
44
55
66
77
88
9 10
10 11
11 12
12 13, 14
13 15, 16
14 17
15 19
16 20, 21
1, 3, 9, 18
EP
Name Description
SGND Analog ground.
BYPASS Connect a bypass capacitor for the internal regulator.
VDD
Input supply.
COMP
Compensation pin for Boost regulator (47nF& 4.7k & 470pF is
suggested).
Regulator On/Off Control Input. The output is disabled when this pin
EN
goes low. The converter turns on when this pin goes high. Connect EN
to the input source (through a 100kΩ pull-up resistor if VIN > 6V) for
automatic startup. Do not leave EN floating.
VOUT compensation selection. For voltage drops on the long coaxial
LINEDROP cable. The LDO output increases by 1V when LINEDROP is high,. Do
not leave LINEDROP floating.
POK
Power OK. A high output indicates that LDO output is within ±12% of
nominal value. A low output means that LDO output is outside this
window.
13V/18V
Select 13V or 18V. For output voltage. Select logic HIGH for 18V and
LOW for 13V. Do not leave this pin floating.
EXTM
External Modulation Input. For 22kHz signaling that is internally shaped
and transferred to the output. Tie it to ground if not used.
TCAP
Internal voltage reference for LDO output, A soft-start capacitor can be
connected to this pin to set rise time of the output voltage. The
capacitor should be very close to this pin and SGND, and the route
should keeps far away from any noise like SW copper.
ILIMIT
Output Current Limit Set. Sets the LDO output current limit of LDO.
Program using a resistor from ILIMIT to GND.
VOUT Output Voltage.
VBOOST Internal LDO Input.
BST Internal LDO Driver Supply.
SW
Switching Input. Drain of the internal boost-stage MOSFET. Connect
the power inductor and output rectifier to SW.
PGND Power Ground.
NC Not Connect.
Exposed Pad
Heatsink. Not connected internally. Connect to a metal GND pad for
best results. Do not connect to other pins.
MP8126 Rev. 1.03
www.MonolithicPower.com
3/28/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
5
5 Page 
MP8126 – LNB POWER SUPPLY AND CONTROL VOLTAGE REGULATOR
GND
VIN
EN
13V/18V
LINEDROP
Top Layer
Bottom Layer
Figure 3: MP8126DF PCB Layout Guide
L1 D1 B230A L2
C1
R3
100k
R6
100k
C4
C10 0.47nF
R5 C5
4.7k 47nF
R2
100k
R7
100k
1 SGND
PGND 16
2 BYPASS
SW 15
3 VDD
BST 14
4 COMP
13
VBOOST
5 EN
VOUT 12
6 LINEDROP ILIMIT 11
7 POK
10
TCAP
8 13V/18V
EXTM 9
MP8126
C6
R1 10k
C7 22nF
R8
100k
Figure 4: Detailed Application Schematic
D3
B0504
D2
B0540
GND
VOUT
EXTM
MP8126 Rev. 1.03
www.MonolithicPower.com
3/28/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MP8126DF.PDF ] | |
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