DC1209A - Demo Manual

DEMO CIRCUIT 1209
QUICK START GUIDE
LT3060EDC
100mA Micropower Low Dropout Linear Regulator
DESCRIPTION
Demonstration circuit 1209A is a Micropower, low
dropout linear regulator featuring LT®3060, which
comes in an 8-lead TSOT23 or 2mmX2mm DFN
package. The DC1209A has an input voltage range
from 2.1V to 45V, and is capable of delivering up to
100mA output current. An external capacitor at
REF/BYP pin provides low noise reference and programmable output soft-start functionality. The
LT3060’s quiescent current is merely 40uA and provides fast transient response with a minimum 2.2uF
output capacitor. The DC1209A is ideal for supplying
power to battery-powered systems, automotive, in-
dustrial, avionic power supplies and portable instruments.
The LT3060 datasheet gives a complete description
of the part, operation and application information.
The datasheet should be read in conjunction with this
quick start guide for working on or modifying the
demo circuit 1209A.
Design files for this circuit board are available.
Call the LTC factory.
, LTC, LTM, LT and uModule are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Table 1. Performance Summary ( TA = 25oC )
PARAMETER
CONDITION
VALUE
Minimum Input Voltage
2.1V
Maximum Input Voltage
45V
Output Voltage
Vin=20V, Iout=100mA
1.2V ±3%
Vin=20V, Iout=100mA
1.5V±3%
Vin=20V, Iout=100mA
1.8V±3%
Vin=20V, Iout=100mA
2.0V±3%
Vin=20V, Iout=100mA
2.5V±3%
Vin=20V, Iout=100mA
3.3V±3%
Vin=20V, Iout=100mA
5.0V±3%
Maximum Output Current
Quiescent Current
100mA
VSHDN=0V
<1µA
1
QUICK START PROCEDURE
The DC1209A is easy to set up to evaluate the performance of the LT3060. Refer to Figure 1. for proper
measurement equipment setup and following the
procedures below:
2.
Apply 2.1V across Vin (to Gnd). Insert
jumper JP7 into the ON position. Draw
100mA of load current. The measured Vout
should be 1.2V ± 3% (1.164V to 1.236V).
1.
3.
Vary the input voltage from 2.1V to 45V and
the load current from no load to 100mA. Vout
should measure 1.2V ± 3% (1.164V to
1.236V).
Before proceeding to test, insert jumper JP7
into the OFF position, and use VOUT Select
jumper JP1 for the desired output voltage
1.2V, 1.8V, 2.0V, 2.5V, 3.3V or 5.0V. If the
output voltage is different from the above values, use the USER option and install a resistor
R8. Select R8 according to the following
equation: R8 =  VOUT −1 ⋅124K .
 0.6V

Assume 1.2V is the desired output for the following evaluations.
Note: Make sure the power dissipation is limited below the thermal limit. Maximum junction temperature also limits the operation conditions. For instance, the junction temperature reaches 125C at
room temperature with 2.5W dissipation on demo
board 1209A.
Figure 1. Proper Measurement Equipment Setup
2
3
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