LTC3025-1_09 Datasheet, PDF (1/5 Pages) Linear Integrated Systems – QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1283

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1283
500mA VERY LOW DROPOUT LINEAR REGULATOR
LTC3025-1
DESCRIPTION
Demonstration circuit 1283 is an ultra-low dropout volt-
age supply using the LTC3025-1 linear regulator, which
comes in a small 2mm x 2mm 6-Pin DFN package. The
DC1283A has an input voltage range from 0.9V to 5.5V,
an output voltage range between 0.4V and 2.6V, and is
capable of delivering 500 mA max of output current.
The 0.4V reference of the LTC3025-1 allows the
DC1283A to supply power to very low voltage applica-
tions. The DC1283A is also an excellent choice for post
regulation of step-down switching regulators, combining
to create a high efficiency low-noise supply. The
DC1283 comes installed with small ceramic capacitors,
showing the LTC3025-1 ability to maintain stability with
ceramic output capacitors.
Design files for this circuit board are available. Call
the LTC factory.
Table 1.
Performance Summary (TA = 25°C)
PARAMETER
Input Voltage Range
Bias Voltage Range
Output Voltage Regulation
Typical Dropout Voltage
Typical Output Voltage Ripple & Noise
CONDITIONS
V_BIAS ≥ V_OUT + 1.5V
VIN = 2.25V to 5.5V, IOUT = 0A to 500 mA,
VBIAS = 5V
VIN = 1.5V, VBIAS = 2.8V, IOUT = 500mA
VALUE
0.9V to 5.5V
2.5V to 5.5V
0.8V±2%(1.152V to 1.248V)
1.2V±2%(1.152V to 1.248V)
1.5V ±2%(1.44V to 1.56V)
1.8V±2%(1.728V to 1.872V)
75mV
< 10mVP–P
QUICK START PROCEDURE
The DC1283 demonstration board is easy to set
up to evaluate the performance of the LTC3025-
1. For proper measurement equipment configu-
ration, set up the circuit according to the dia-
gram in Figure 2. Before proceeding to test, in-
sert the Vout Enable jumper into the OFF (up-
per) position, connecting the RUN pin to ground
(GND), which shuts down the circuit.
When measuring the input or output ripple or
noise voltage, care must be taken to avoid a
long ground lead on the oscilloscope probe.
Measure the voltages by touching the probe tip
directly across the Vin or Vout and GND termi-
nals. See Figure 1 for proper scope probe tech-
nique. The DC1283 is easy to set up to evalu-
ate the performance of the LTC3025-1. For a
proper measurement equipment configuration,
set up the circuit according to the diagram in
Figure 2.
Please follow the procedure outlined below for
proper operation.
1