Data Sheet
Austin MicroLynxTM II SIP Non-isolated Power Modules:
June 24, 2008
2.4 – 5.5Vdc input; 0.75Vdc to 3.63Vdc Output; 6A output current
electrical specification. The POL Programming Tool,
Feature Descriptions (continued)
available at www.lineagepower.com under the Design
Tools section, helps determine the required external trim
resistor needed for a specific output voltage.
Output Voltage Programming
The output voltage of the Austin MicroLynxTM II SIP can
be programmed to any voltage from 0.75 Vdc to 3.3 Vdc
by connecting a single resistor (shown as Rtrim in Figure
30) between the TRIM and GND pins of the module.
Without an external resistor between TRIM pin and the
ground, the output voltage of the module is 0.7525 Vdc.
To calculate the value of the resistor Rtrim for a particular
output voltage Vo, use the following equation:
Voltage Margining
Output voltage margining can be implemented in the
Austin MicroLynxTM II modules by connecting a
resistor, Rmargin-up, from the Trim pin to the ground pin
for margining-up the output voltage and by connecting
a resistor, Rmargin-down, from the Trim pin to the Output
pin for margining-down. Figure 31 shows the circuit
configuration for output voltage margining. The POL
Programming Tool, available at
21070
⎡
⎤
Rtrim =
−5110 Ω
⎢
⎥
Vo − 0.7525
⎣
⎦
www.lineagepower.com under the Design Tools
section, also calculates the values of Rmargin-up and
For example, to program the output voltage of the Austin
MicroLynxTM II module to 1.8 Vdc, Rtrim is calculated is
follows:
Rmargin-down for a specific output voltage and % margin.
Please consult your local Lineage Power technical
representative for additional details.
21070
⎡
⎤
Rtrim =
− 5110
⎢
⎣
⎥
⎦
Vo
1.8 − 0.7525
Rmargin-down
Rtrim =15.004kΩ
Austin Lynx or
Lynx II Series
Vout
VIN(+)
VO(+)
Q2
Trim
ON/OFF
LOAD
TRIM
Rmargin-up
R
Rtrim
trim
GND
Q1
Figure 30. Circuit configuration to program output
voltage using an external resistor.
GND
Figure 31. Circuit Configuration for margining
Output voltage.
Table 1 provides Rtrim values required for some common
output voltages.
Table 1
VO, set (V)
0.7525
1.2
Rtrim (KΩ)
Open
41.973
23.077
15.004
6.947
1.5
1.8
2.5
3.3
3.160
By using a 1% tolerance trim resistor, set point
tolerance of ±2% is achieved as specified in the
LINEAGE POWER
13
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