MP8125
550mA, 8-14V Input, LNB Power Supply
and Control Voltage Regulator
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The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP8125 is a voltage regulator designed to
provide efficient, low noise power to the
Satellite receiver’s RF LNB (Low Noise Block)
converter via coaxial cable through a DiSEqC
1.x compatible link that receives instructions
from a dedicated controller.
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The MP8125 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 down converted to the receiver.
The tracking linear regulator protects the output
against overload or short.
The MP8125 provides a number of features
described in the European EUTELSAT
specification (DiSEqC) including: voltage
selection of horizontal or vertical polarization
directions of LNB and a selectable VOUT
compensation for voltage drop on the long
coaxial cable. In accordance with DiSEqC
standard, a tone signal of 22kHz is generated
by an internal oscillator and can be activated or
deactivated onto output by EXTM pin.
DiSEqC 1.x Compatibility
Up to 550mA Output Current
8V to 14V Input Voltage
Boost Converter with Internal Switch
Low Noise LDO Output
Built-in 22kHz Tone Signal Generator
Programmable Current Limit
1V Line Drop Compensation
Adjustable Soft-start Time
POK Indicator
Short Circuit Protection
Over Temperature Protection
TSSOP16 Exposed Pad and 24-pin QFN (4
x 4mm) 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 MPS website under Quality Assurance. “MPS” and “The
Future of Analog IC Technology” are Registered Trademarks of Monolithic
Power Systems, Inc.
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The MP8125 is available in thermally enhanced
TSSOP16 and 24-pin QFN (4 x 4mm) packages.
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TYPICAL APPLICATION
MP8125 Rev. 1.11
5/9/2013
www.MonolithicPower.com
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© 2013 MPS. All Rights Reserved.
1
MP8125 – LNB POWER SUPPLY AND CONTROL VOLTAGE REGULATOR
ORDERING INFORMATION
Top Marking
MP8125EF*
Package
TSSOP-16
Free Air Temperature (TA)
MP8125
-20°C to +85°C
MP8125DR
QFN24(4x4mm)
MP8125
-40°C to +85°C
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Part Number
* For Tape & Reel, add suffix –Z (e.g. MP8125EF–Z).
For RoHS compliant packaging, add suffix –LF (e.g. MP8125EF–LF–Z)
PACKAGE REFERENCE
14
BST
COMP
4
13
VBOOST
EN
5
12
VOUT
LINEDROP
6
11
ILIMIT
POK
7
10
TCAP
13V/18V
8
9
EXTM
TSSOP-16
ABSOLUTE MAXIMUM RATINGS (1)
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VDD ................................................-0.3V to 16V
VOUT, SW, VBOOST ....................-0.3V to 25V
BST ....................................................... VSW +7V
All Other Pins ................................-0.3V to 6.5 V
Continuous Power Dissipation.….(TA=+25°C) (2)
TSSOP-16……………………………………2.8W
QFN24(4x4mm)………………………………2.9W
Junction Temperature ...............................150°C
Lead Temperature ....................................260°C
Storage Temperature................. -65°C to 150°C
Recommended Operating Conditions (3)
Supply Voltage VIN ..............................8V to 14V
Output Voltage VOUT ............... 13V/14V/18V/19V
Maximum Junction Temp. (TJ) ...............+125°C
MP8125 Rev. 1.11
5/9/2013
SW
3
24
23
22
21
20
19
NC
1
18 NC
VDD
2
17 BST
NC
3
COMP
4
EN
5
14 VOUT
LINEDROP
6
13 VOUT
16 VBOOST
EXPOSED PAD
CONNECT TO GND
7
8
15 VBOOST
9
10
11
12
ILIMIT
VDD
PGND
SW
TCAP
15
PGND
2
EXTM
BYPASS
SGND
PGND
NC
16
13V/18V
1
POK
SGND
BYPASS
TOP VIEW
BYPASS
TOP VIEW
QFN24
Thermal Resistance (4)
θJA
θJC
TSSOP-16...............................45 ....... 8 .... °C/W
QFN24(4x4mm) ......................42 ....... 9 .... °C/W
Notes:
1) Exceeding these ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature TJ(MAX), the junction-toambient thermal resistance θJA, and the ambient temperature
TA. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by PD(MAX)=(TJ(MAX)TA)/ θJA. Exceeding the maximum allowable power dissipation
will cause excessive die temperature, and the regulator will go
into thermal shutdown. Internal thermal shutdown circuitry
protects the device from permanent damage.
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7 4-layer PCB
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© 2013 MPS. All Rights Reserved.
2
MP8125 – LNB POWER SUPPLY AND CONTROL VOLTAGE REGULATOR
ELECTRICAL CHARACTERISTICS
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VIN = 12V, TA = 25°C, unless otherwise noted.
Parameter
Symbol Condition
General
Input Voltage Range
Input Supply Current (5)
Under Voltage Lockout
UVLO Hysteresis
VIN
IIN
UVLO
VEN_High
VEN_Low
13V/18V
Input
Logic V13/18_High
Threshold
V13/18_Low
LINEDROP
Input
Logic VLD_High
Threshold
VLD_Low
TCAP pin current
ICHA
Output Backward Leakage
IBKLK
Current (6)
Voltage on BYPASS pin
VBYP
SWITCHING REGULATOR
Boost Switch On Resistance
RDSON
(5)
R
Boost Frequency
LINEAR REGULATOR
Dropout Voltage (5)
OUTPUT
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Output Line Regulation
Output Load Regulation (5)
MP8125 Rev. 1.11
5/9/2013
Typ
Max
Units
8
12
5
14
V
mA
V
mV
V
V
V
V
V
V
μA
7
8
350
EN Input Logic Threshold
Output Voltage
EN=High, no load
VIN rising
Min
VEN rising
VEN falling
V13V/18V rising
V13V/18V falling
VLINEDROP rising
VLINEDROP falling
TCAP capacitor charging
EN=Low, VOUT is clamped to
24V, VBOOST is float
2
0.8
2
0.8
2
0.8
7
0.7
IOUT =500mA
VBOOST-VOUT, IOUT=500mA
VOUT
LINEDROP=Low,
13V/18V=Low, IOUT =10-100mA
LINEDROP=Low,
13V/18V=High, IOUT =10-100mA
LINEDROP=High,
13V/18V=Low, IOUT =10-100mA
LINEDROP=High,
13V/18V=High, IOUT =10-100mA
8V≤VIN≤14V; IOUT=100mA
10mA≤IOUT≤500mA,
13V/18V=Low
10mA≤IOUT≤500mA,
13V/18V=High
1
mA
5
V
500
mΩ
352
kHz
0.9
V
12.8
13.2
13.6
V
17.6
18.14
18.7
V
13.72
14.2
14.58
V
18.57
19.14
19.73
V
4
40
mV
20
mV
30
mV
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© 2013 MPS. All Rights Reserved.
3
MP8125 – LNB POWER SUPPLY AND CONTROL VOLTAGE REGULATOR
ELECTRICAL CHARACTERISTICS (continued)
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VIN = 12V, TA = 25°C, unless otherwise noted.
Parameter
TONE Signal
Symbol Condition
Tone Signal Frequency
fTONE
TA = 25°C
VEXTM_High VEXTM rising
EXTM Input Logic Threshold
VEXTM_Low VEXTM falling
Delay Time of Tone Signal
Activated or Deactivated (5)
Peak-to-Peak Amplitude
Rise and Fall Time
Over-Current Protection
Output Current Limit
Dynamic Overload
Protection Off Time
Dynamic Overload
Protection On Time
POK
POK Upper Trip Threshold
(5)
POK Lower Trip Threshold
POK Output Lower Voltage
Thermal Protection
Over Temperature
Shutdown (5)
OTP Hysteresis
tDELAY
Min
Typ
Max
Units
20
22
24
kHz
2
V
V
0.8
1.5
fTONE
Delay time after EXTM goes
high or low
VPP
ILOAD = 0 to 100mA
RL=1kΩ, CL=0.1μF
0.55
0.65
8
0.9
V
μs
ILIMIT
RLIMIT=10kΩ
600
850
1100
mA
TOFF
Time of attempt to restart
2
s
TON
Time to onset of shutdown
50
ms
VFB with Respect to Nominal
12
%
VFB with Respect to Nominal
ISINK = 5mA
-12
0.3
%
V
150
°C
20
°C
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Note:
5) Guaranteed by design.
6) Shall withstand the back voltage for an indefinite period of time. On removal of the fault condition the device returns to normal operation
MP8125 Rev. 1.11
5/9/2013
www.MonolithicPower.com
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© 2013 MPS. All Rights Reserved.
4
MP8125 – LNB POWER SUPPLY AND CONTROL VOLTAGE REGULATOR
PIN FUNCTIONS
Pin #
QFN24
Name
1
2
3
4
22
23, 24
2
4
SGND
BYPASS
VDD
COMP
5
EN
6
LINEDROP
7
POK
8
13V/18V
10
EXTM
11
TCAP
12
ILIMIT
13, 14
15, 16
17
VOUT
VBOOST
BST
19
SW
20, 21
1, 3, 9, 18
PGND
NC
5
6
7
8
9
10
11
R
12
13
14
15
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16
Description
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Pin #
TSSOP-16
MP8125 Rev. 1.11
5/9/2013
Analog ground.
Connect a bypass capacitor for the internal regulator.
Input supply pin.
Compensation pin for Boost regulator (47nF & 19.6kΩ is suggested).
Regulator On/Off Control Input. When this pin is low, the output is
disabled. A high level at EN turns on the converter. Connect EN to the
input source (through a 100kΩ pull-up resistor if VIN > 6V) for
automatic startup. EN cannot be left floating.
This pin provides selectable VOUT compensation for voltage drop on the
long coaxial cable. When the LINEDROP is high, the LDO output is 1V
increased. LINEDROP cannot be left floating.
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.
Select 13V or 18V for output voltage. High level for 18V while low level
for 13V. This pin cannot be left floating.
External modulation input for 22kHz signaling. A high level at EXTM
turns on 22kHz signal and a low level disables it. EXTM cannot be left
floating.
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.
The ILIMIT is used to set the value of the output current limit of LDO. A
resistor from ILIMIT to GND programs the limit.
Output voltage.
Input of the internal LDO.
Supply for the internal LDO driver.
SW is the drain of the internal MOSFET switch of Boost stage.
Connect the power inductor and output rectifier to SW.
Power ground.
Not Connect.
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5
MP8125 – LNB POWER SUPPLY AND CONTROL VOLTAGE REGULATOR
TYPICAL PERFORMANCE CHARACTERISTICS
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Performance waveforms are tested on the evaluation board of the DESIGN EXAMPLE section.
VIN =12V, VLINEDROP=5V, VEXTM=0V, TA = +25ºC, unless otherwise noted.
MP8125 Rev. 1.11
5/9/2013
www.MonolithicPower.com
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© 2013 MPS. All Rights Reserved.
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MP8125 – LNB POWER SUPPLY AND CONTROL VOLTAGE REGULATOR
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TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Performance waveforms are tested on the evaluation board of the DESIGN EXAMPLE section.
VIN =12V, VLINEDROP=5V, VEXTM=0V, IOUT=0.55A, TA = +25ºC, unless otherwise noted.
MP8125 Rev. 1.11
5/9/2013
www.MonolithicPower.com
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© 2013 MPS. All Rights Reserved.
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MP8125 – LNB POWER SUPPLY AND CONTROL VOLTAGE REGULATOR
BLOCK DIAGRAM
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8~14V Vin
VDD
TCAP
COMP
SW
EN
Internal
Regulator
BYPASS
VBOOST
Boost
Driver
PGND
Vref
Charge
Pump
BST
13V / 18V
Switch
13V/18V
SGND
VOUT
13V/18V
+1V Offset
LINEDROP
Frequency
Divider
POK
22kHz
Shaper
POK
Current
Limit
ILIMIT
EXTM
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Figure 1—Internal Function Block Diagram
MP8125 Rev. 1.11
5/9/2013
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8
MP8125 – LNB POWER SUPPLY AND CONTROL VOLTAGE REGULATOR
OPERATION
The MP8125 has an integrated boost converter
that, from a single supply source between 8V
and 14V, generates the voltage to enable the
linear post-regulator to work at a minimum
dissipated power.
Boost Converter/Linear Regulator
The boost converter is a fixed frequency, nonsynchronous voltage regulator with peak
current mode control. The operating frequency
is 352kHz typically, which is 16 times the 22kHz
internal tone frequency.
To reduce power dissipation, the boost
converter operates in a pulse-skipping mode at
light load.
The output voltage of boost converter tracks the
requested output voltage to allow the linear
regulator to work with minimum drop-out
voltage.
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13V/18V Switching
With the logic input pin 13V/18V, the output
voltage can be set to 13V or 18V to select
different polarization directions of LNB. A logic
high level on this pin will set the output to 18V
while a low level set it to 13V.
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LINEDROP Control
In order to compensate the excess of voltage
drop along the coaxial cable, a voltage
compensation function is integrated. If set a
high level on LINEDROP pin, the output voltage
can be increased by 1 V. A low level will disable
the function.
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Current Limit
The output current is limited dynamically and
the threshold can be programmed by an
external resistor connected to the ILIMIT pin
according to the following formula:
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The MP8125 is a single output voltage regulator
for providing both supply voltage and control
signal from satellite set-top box modules to LNB
(low noise block) of the antenna port.
Soft Start
Soft start is implemented via external capacitor
(CSS). With the required slew rate (k) of the
output voltage, the value of CSS can be obtained
using the following formula:
CSS = (15 × ICHA ) / k
ILIMIT = 8500 / RLIMIT
When an overload is detected, the output
current will be regulated at the current limit level
for 50 ms. After this time period, if the overload
is still detected, the output will be shut down for
2s before the output is resumed.
For the boost converter, it integrates cycle-bycycle over current limit function, which can
guarantee the part works with full load.
Power Good (POK)
POK is connected to an internally open-drain
device. When output voltage is out of +/- 12% of
normal value, POK will be pulled down.
Otherwise, it will be pulled high.
Tone Generation
In accordance with DiSEqC standards, a tone
signal of 22kHz is generated by an internal
oscillator and activated/deactivated by EXTM
pin. A high level on EXTM activates the internal
tone signal and modulates it onto the output to
provide the LNB control information. A low level
will deactivate the 22kHz signal.
The tone signal will be activated or deactivated
onto the output within 1.5 periods after EXTM
goes high or low. Please refer to the Figure 2 (T
is the period of tone signal.).
1.5T
EXTM
Tone
Output
1.5T
Figure 2—Tone Signal on Output
Thermal Protection
When the junction temperature exceeds
+150°C, the part will be shut down. Once the
junction temperature is cooled enough, typically
130°C, the part will re-start automatically.
Where ICHA is 7 μA typ.
MP8125 Rev. 1.11
5/9/2013
www.MonolithicPower.com
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© 2013 MPS. All Rights Reserved.
9
MP8125 – LNB POWER SUPPLY AND CONTROL VOLTAGE REGULATOR
APPLICATION INFORMATION
Selecting the Inductor of Boost Converter
An inductor with a DC current rating of at least
25% higher than the maximum load current is
recommended. For most designs, the inductance
value can be derived from the following equation.
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COMPONENT SELECTION
Selecting the Input Capacitor
The input capacitor (C1) is required to maintain
the DC input voltage. Ceramic capacitors with
low ESR/ESL types are recommended. The input
voltage ripple can be estimated by the below
formula. Typically, a 10μF X7R ceramic capacitor
is recommended.
ΔVIN =
⎛
VIN
V ⎞
⋅ ⎜ 1 − IN ⎟
2
8fs ⋅ L ⋅ C1 ⎝ VOUT ⎠
Setting the Output Capacitor of Boost
Converter
The output current to the step-up converter is
discontinuous, therefore a capacitor is essential
to supply the AC current to the load. Use low
ESR capacitors for the best performance. The
output voltage ripple can be estimated by the
below formula.
ΔVOUT =
⎛
VOUT
V ⎞
⋅ ⎜ 1 − IN ⎟
fs ⋅ RL ⋅ C2 ⎝ VOUT ⎠
Where RL is the value of load resistor.
VIN (VOUT − VIN )
fs ⋅ VOUT ⋅ ΔIL
Where ∆IL is the inductor ripple current. Choose
inductor ripple current to be approximately 30%
of the maximum load current.
Selecting the
Converter
Rectifier
Diode
of
Boost
The high switching frequency demands highspeed
rectifiers.
Schottky
diodes
are
recommended for most applications because of
the fast recovery time and low forward voltage.
Typically, a 2A Schottky diode is recommended
for the boost converter.
DESIGN EXAMPLE
Below is a design example following the
application guidelines for the specifications:
VIN
12V
VOUT
19V
The detailed application schematic is shown in
Figure 3. The typical performance and circuit
waveforms have been shown in the Typical
Performance Characteristics section. For more
possible applications of this device, please refer
to related Evaluation Board Data Sheet.
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Ceramic capacitors with X7R dielectrics are
highly recommended because of their low ESR
and small temperature coefficient. Typically, a
22μF X7R ceramic capacitor is recommended.
L=
MP8125 Rev. 1.11
5/9/2013
www.MonolithicPower.com
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© 2013 MPS. All Rights Reserved.
10
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MP8125 – LNB POWER SUPPLY AND CONTROL VOLTAGE REGULATOR
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Figure 3—Detailed Application Schematic
MP8125 Rev. 1.11
5/9/2013
www.MonolithicPower.com
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© 2013 MPS. All Rights Reserved.
11
MP8125 – LNB POWER SUPPLY AND CONTROL VOLTAGE REGULATOR
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PACKAGE INFORMATION
TSSOP16
4.20
TYP
0.40
TYP
4.90
5.10
16
0.65
BSC
9
1.60
TYP
4.30
4.50
PIN 1 ID
1
6.20
6.60
3.30
TYP
5.80
TYP
8
TOP VIEW
RECOMMENDED LAND PATTERN
0.80
1.05
1.20 MAX
SEATING PLANE
0.19
0.30
0.65 BSC
0.00
0.15
0.09
0.20
SEE DETAIL "A"
SIDE VIEW
FRONT VIEW
GAUGE PLANE
0.25 BSC
R
3.65
4.15
0o-8o
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DETAIL “A”
2.80
3.30
BOTTOM VIEW
MP8125 Rev. 1.11
5/9/2013
0.45
0.75
NOTE:
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH
,
PROTRUSION OR GATE BURR.
3) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD FLASH
OR PROTRUSION.
4) LEAD COPLANARITY(BOTTOM OF LEADS AFTER FORMING)
SHALL BE 0.10 MILLIMETERS MAX.
5) DRAWING CONFORMS TO JEDEC MO-153, VARIATION ABT.
6) DRAWING IS NOT TO SCALE.
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© 2013 MPS. All Rights Reserved.
12
MP8125 – LNB POWER SUPPLY AND CONTROL VOLTAGE REGULATOR
QFN24 (4X4mm)
3.90
4.10
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2.50
2.80
19
PIN 1 ID
MARKING
18
3.90
4.10
PIN 1 ID
INDEX AREA
1
0.50
BSC
2.50
2.80
0.18
0.30
6
13
0.35
0.45
TOP VIEW
12
7
BOTTOM VIEW
PIN 1 ID OPTION A
0.30x45º TYP.
0.20 REF
PIN 1 ID
SEE DETAIL A
24
PIN 1 ID OPTION B
R0.25 TYP.
0.80
1.00
0.00
0.05
DETAIL A
SIDE VIEW
3.90
NOTE:
2.70
R
0.70
T
0.25
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH.
3) LEAD COPLANARITY SHALL BE 0.10 MILLIMETER MAX.
4) DRAWING CONFIRMS TO JEDEC MO-220, VARIATION VGGD.
5) DRAWING IS NOT TO SCALE.
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0.50
RECOMMENDED LAND PATTERN
NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.
Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS
products into any application. MPS will not assume any legal responsibility for any said applications.
MP8125 Rev. 1.11
5/9/2013
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© 2013 MPS. All Rights Reserved.
13
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