Linear Technology LTC3124, Демонстрационное руководство

Страница: 1 / 6

1
dc1859afa
DEMO MANUAL DC1859A
DESCRIPTION
LTC3124
Dual Phase Synchronous
Step-Up DC/DC Converter
Demonstration circuit 1859A is a dual phase single out-
put DC/DC boost converter featuring the LTC
®
3124 . The
DC1859A operates over 1.8V to 5.5V input and generates
12V at up to 1.5A from a 5V input. The maximum output
current for a 1.8V input is 750mA. Also, the LTC3124 has
a 2% precise voltage reference, which can generate an
output voltage with 2.2% tolerance if 0.1% voltage divider
resistors are used. The 1MHz switching frequency opera-
tion results in small and efficient circuit. The converter
operates with only one phase in Burst Mode
®
operation
L
, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
PERFORMANCE SUMMARY
and achieves over 90% efficiency with a 100mA load. The
demonstration circuit can be easily modified to generate
different output voltages.
The DC1859 has small circuit footprint. It is a high perfor-
mance and cost effective solution for generating output
voltages up to 15V from inputs as low as 1.8V.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1859A
Specifications are at T
A
= 25°C
PARAMETER CONDITION MIN TYP MAX UNITS
Minimum Input Voltage I
OUT
= 0A to 0.75A 1.8 V
Maximum Input Voltage I
OUT
= 0A to 1.5A 5.5 V
V
OUT
V
IN
= 1.8V to 5.5V, I
OUT
= 0A 12 V ±4%
Output Voltage Ripple V
IN
= 5V, I
OUT
= 1.5A 100 mV
P-P
Nominal Switching Frequency 1 MHz