LSM2-T MURATA [Murata Manufacturing Co., Ltd.], LSM2-T Datasheet - Page 5

• Manufacturer Part Number: LSM2-T
• Description: DOSA-SMT, 30A POL DC/DC Converters
• Manufacturer: MURATA [Murata Manufacturing Co., Ltd.]

Specification Notes continued:
(7) If Sense is connected remotely at the load, up to 0.5 Volts difference is allowed between the
(8) Output noise may be further reduced by adding an external filter. See I/O Filtering and Noise Reduc-
tion.
(9) All models are fully operational and meet published specifications, including “cold start” at –40° C.
(10) Regulation specifications describe the deviation as the line input voltage or output load current
(11) Other input or output voltage ranges will be reviewed under scheduled quantity special order.
(12) Maximum continuous power requires that all on-board components not exceed +128°C pack-
(13) Do not exceed maximum power specifications when adjusting the output trim.
(14) The “R” option includes extra ground pads. These pads offer two important features. In addition
(15) The maximum output capacitive loads depend on the the Equivalent Series Resistance (ESR)
(16) Do not use Pre-bias startup and sequencing together. If you do not use the track function, leave
(17) After short circuit shutdown, if the load is partially removed such that the load still exceeds the
(18) Output current limiting is disabled at start up to avoid overcurrent shutdown while charging
Output Adjustments
The LSM2-T/30-D12 series includes a special output voltage trimming fea-
ture which is fully compatible with competitive units. The output voltage may
be varied using a single trim resistor from the Trim Input to Power Common.
the converter with short leads. Be aware that the voltage accuracy is ±1.5%
(typical) therefore adjust this resistance to achieve your desired output.
Use a precision, low-tempco resistor (±100 ppm/
Sense and +V
age drop may cause the converter to exceed maximum power dissipation.
is varied from a nominal midpoint value to either extreme.
age temperature.
to carrying extra current, they also help dissipate additional heat. MPS strongly recommends
soldering the “R” pads to a thick ground plane with sizable area. The Operating Temperature
specification listed above assumes that these additional ground pads are connected to
a substantial ground plane below the converter ( at least several square inches).
of the external output capacitor. Larger caps will reduce output noise but may slow transient
response.
the seq/trk pin open.
overcurrent (OC) detection, the converter will remain in hiccup restart mode.
external bypass capacitors.
out
pins to compensate for ohmic voltage drop in the power lines. A larger volt-
Figure 1. Trim Resistor Connections
www.murata-ps.com
ο
C) mounted close to
The fixed trim resistors to set the output voltage are:
Voltage Trim
The LSM2 Series may also be trimmed using an external low-noise voltage
applied between the Trim input and Output Common. Be aware that the inter-
nal “load” impedance looking into Trim pin is below 1000 Ohms and includes
factors from the output voltage. Therefore, use a low impedance source
resistance in your external voltage reference.
The fixed trim voltages to set the output voltage are:
V
Rtrim (Ohms)
V
Rtrim (Ohms)
V
Vtrim (Volts)
V
Vtrim (Volts)
out
out
out
out
(typ.)
(typ.)
R
TRIM
LSM2-T/30-D12 Series
Technical enquiries email: [e-mail], tel:
0.90 KΩ
0.720V.
0.80V.
(in Ohms) =
Open
Open
2.0 V.
0.8V.
2.0V.
Figure 2. Voltage Trim Connections
Resistor Trim Equation
DOSA-SMT, 30A POL DC/DC Converters
5.90 KΩ
0.787V.
0.687V.
605 Ω
1.0V.
2.5V.
1.0V.
2.5V.
MDC_LSM2_T30_D12 Series.B11 Page 5 of 12
---------------------
V
OUT
2.90 KΩ
1200
0.773V.
0.633V.
380 Ω
1.2V.
3.3V.
1.2V.
3.3V.
– 0.8
Voltage Reference,
0.753V.
0.520V.
185.71
1.614
1.5V.
5.0V.
1.5V.
5.0V.
KΩ
-100
Ω
[phone]
1.10 KΩ
0.733V
1.8V.
1.8V.