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DC502A

Description
board eval for lt1767ems8e
CategoryDevelopment board/suite/development tools   
File Size205KB,7 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance  
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board eval for lt1767ems8e

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 502
LT1767
DESCRIPTION
Demonstration
circuit
502
is
a
1.25MHz 1.5A monolithic step-down
DC/DC switching converter using the
LT1767 buck regulator. With its fast
switching speed, 1.5A internal power
switch, and wide input voltage range,
the LT1767 is a very versatile and
powerful IC for DC/DC converters that
require compact space and a wide va-
riety of input voltage ranges. The
constant 1.25MHz switching frequency
allows all of the components to be
very small, surface mount devices.
The current-mode control topology
creates fast transient response and
good loop stability with a minimum
number of external compensation com-
ponents and ceramic input and output
capacitors. The low resistance inter-
nal power switch (0.22Ω) maintains
high efficiencies >80% and up to 90%.
The SHDN pin and 6uA shutdown current
extends battery life. The wide V
IN
range of the LT1767 allows step-down
configurations from 3Vin up to 25Vin.
Synchronization of switching frequen-
cies up to 2MHz is possible.
Demonstration Circuit 502 is a step-
down converter using the LT1767EMS8E.
The circuit is designed for 6.6-25V
Table 1. Typical Performance Summary
PARAMETER
Input Voltage Range
Input Voltage Range
V
out
V
out
Maximum Output Current
Typical Switching Frequency
Typical Efficiency
CONDITION
V
out
= 5V (Jumper Selection)
V
out
= 3.3V (Jumper Selection)
V
out
= 5V (Jumper Selection)
V
out
= 3.3V (Jumper Selection)
VALUE
6.6V–25V
4.5V–18V
5V ±3%
3.3V ±3%
1A
1.25MHz
V
in
= 12V, V
out
= 5V, I
out
= 1A 84%
1.25MHZ WIDE INPUT RANGE STEP DOWN DC/DC CONVERTER
input to 5.0V output @1A or for 4.5-
25V
input to 3.3V output @1A for ca-
ble modem, handheld, automotive, and
desktop computer applications. The
output voltage is jumper selectable
(5V or 3.3V). This board was designed
for wide input voltage range applica-
tions where simplicity, small circuit
size, and low component count are im-
portant as well as up to 1A of load
current. The use of ceramic capaci-
tors not only demonstrates small size
and low cost, but the advantage of
current-mode control in step-down ap-
plications with a simple compensation
network and a place-holder for a
feedforward capacitor for more rugged
stability and optimal transient re-
sponse if required.
Design files for this circuit board
are available. Call the LTC factory.
Higher input voltages may pulse-skip due to
minimum on-time restrictions. Compensation
component changes may be necessary to opti-
mize pulse-skipping during high-temperature,
high-voltage conditions and maintain control
of switch current.
1
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