1
dc1883Af
DEMO MANUAL DC1883A
Description
LTC3103EDD
1.8µA Quiescent Current, 15V,
300mA Synchronous Step-Down
DC/DC Converter
Demonstration Circuit 1883A features the LTC
®
3103, a high
efficiency, monolithic synchronous step-down converter
using a current mode architecture capable of supplying
300mA of output current. The IC operates with a fixed
frequency oscillator at 1.2MHz.
The LTC3103 has two user selectable (JP2) operating
modes: Burst Mode
®
operation and forced continuous
operation (fixed frequency PWM). The IC has internal
compensation and an accurate programmable RUN pin.
The LTC3103 operates with a 2.5V to 15V input voltage
range. The demo board has been designed with a main
output set to 1.8V. Since the LTC3103 is a buck converter,
as V
IN
approaches V
OUT
, the output will start dropping out
of regulation. Consult the data sheet for information on
the minimum V
IN
to V
OUT
differential for regulation. The
regulation range is also a function of the load current.
Typical demo board efficiency is shown in Figures 1 and 2.
The LTC3103 data sheet has detailed information about
the operation, specification and applications of the part.
The data sheet should be read in conjunction with this
Quick Start Guide.
Design files for this circuit board are available at
http://www.linear.com/demo
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
(T
A
= 25°C)
PARAMETER
CONDITIONS
TYPICAL VALUE
Input Voltage Range
(See Note 1)
2.5V to 15V
V
OUT
(See Note 1)
1.8V
I
OUT
300mA
Note 1. The demo board can operate with V
IN
less than V
OUT
, however V
OUT
will drop out of regulation. The regulation range is a function of I
OUT
. Please
refer to the data sheet for more information.
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