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dc1667afa
DEMO MANUAL DC1667A
DESCRIPTION
LTC3600
16V, 1.5A Synchronous
Step-Down Regulator with
Programmable Reference
Demonstration circuit DC1667A is a step-down DC/
DC converter using LT C
®
3600 monolithic synchronous
buck regulator. DC1667A has an input voltage range of
4.5V to 15V, and is capable of delivering up to 1.5A of
output current. The output voltage of the DC1667 can be
set by a single resistor from 0V to (V
IN
– 0.5)V. At light
load conditions, DC1667 can operate in discontinuous
mode to improve the efficiency. During shutdown mode,
LTC3600 consumes less than 1µA. The switching frequency
of LTC3600 is programmable from 200kHz to 4MHz.
DC1667A uses low profile surface mount components.
PERFORMANCE SUMMARY
These features and the availability of LTC3600 in a 12-lead
DFN/MSOP package, make it ideal for use in point-of-load
power supplies, battery-powered equipments and voltage
tracking systems. The LTC3600 data sheet must be read
in conjunction with this demo manual for working on or
modifying the demo circuit DC1667A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1667A
L, LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
(T
A
= 25°C)
PARAMETER CONDITIONS VALUE
Input Voltage Range 4.5V to 15V
Default Output Voltage V
OUT
V
IN
= 4.5V to 15V, I
OUT
= 0A to 1.5A, JP10: CCM 1.215V ± 2% (1.19V to 1.24V)
Maximum Continuous Output Current 1.5A
Default Operating Frequency 1MHz
Typical Output Voltage Ripple V
IN
= 5V, V
OUT
= 1.2V, I
OUT
= 1.5A, f
SW
= 1MHz <10mV (See Figure 4)
Efficiency V
IN
= 5V, V
OUT
= 1.2V, I
OUT
= 1.5A, f
SW
= 1MHz 78% (See Figure 3)
