Linear Technology DC627A-A Quick Start Manual

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 627

DESCRIPTION

Demonstration circuit 627 features the LT3461 /
LT3461A in a 12.0V output boost converter which
operates from an input voltage of 3V to 6V. The
maximum output current is 70mA when powered
from a 5.0V input and 40mA when powered from a
3.3V input. A soft-start option is provided by the
SHDN pin and can be configured with an on-board RC
filter.
The internal schottky of the LT3461 / LT3461A re-
duces part count and the high switching frequency
allows the use of a small SMT inductor and output
capacitors. The small size of the circuit makes it ideal
for space-sensitive applications.
Table 1. Performance Summary (T
PARAMETER
LT Part
Minimum Input Voltage
Maximum Input Voltage
Output Voltage V
OUT
Maximum Output Current
Typical Efficiency
Typical Output Voltage Ripple
(20MHz BW)
Nominal Switching Frequency

QUICK START PROCEDURE

Demonstration circuit 627 is easy to set up to evalu-
ate the performance of the LT3461 or LT3461A. Refer
to Figure 1 for the proper measurement equipment
setup and follow the procedure below:
Place jumper JP1 in the "ON" position if not al-
1.
ready done.
= 25°C)
A
CONDITION
V = 3V to 6V
IN
V = 3.3V
IN
V = 5.0V
IN
V = 3.3V, I = 40mA
IN OUT
V = 5.0V, I = 70mA
IN OUT
V = 3.3V, I = 40mA
IN OUT
V = 5.0V, I = 70mA
IN OUT
The DC627A comes in two versions. The "-A" version
uses the LT3461 and the "-B" version uses the
LT3461A.
Design files for this circuit board are available. Call
the LTC factory.
LT is a trademark of Linear Technology Corporation
DC627A-A
VALUE
LT3461ES6
3V
6V
12V ±4%
40mA
70mA
79%
83%
20mV
P–P
28mV
P–P
1.3MHz
With power off, connect the input power supply.
2.
Turn on the input power source and set it to 3.3V.
3.
The output should be 12.0V ±4% at no load.
Connect the load from VOUT to GND and set to
4.
40mA. The output should still be 12.0V ±4%.
BOOST CONVERTER
LT3461 / LT3461A
DC627A-B
VALUE
LT3461AES6
3V
6V
12V ±4%
40mA
70mA
76%
81%
9mV
P–P
12mV
P–P
3.0MHz
1