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dc1768af
DEMO MANUAL DC1768A
DESCRIPTION
LTC3626EUDC
20V, 2.5A Synchronous Monolithic
Step-Down Regulator with Current
and Temperature Monitoring
Demonstration circuit 1768A is a step-down converter,
using the LTC3626 monolithic synchronous buck regulator,
which has current and temperature monitoring capabilities.
The 1768A has an input voltage range of 3.6V to 20V, and
is capable of delivering up to 2.5A of output current. The
output voltage of the 1768A can be set as low as 0.6V, the
reference voltage of the LTC3626. At light load currents, the
1768A is capable of operating in Burst Mode
™
, which makes
for greater efficiency, and during shutdown, it consumes
less than 2μA of quiescent current. In continuous mode
operation, the 1768A is a high efficiency circuit over 90%.
The 1768A can also track another voltage with the LTC3626
L
, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
PERFORMANCE SUMMARY
track function. Because of the current and temperature
monitoring and limiting capabilities of the LTC3626, the
1768A input or output current, as well as its maximum
temperature can be limited or clamped. The 1768A uses
low profile surface mount components, due to the high
switching frequency capability of the LTC3626, which is
programmable up to 3MHz. All these features make the
1768A an ideal circuit for use in industrial applications.
Design files for this circuit board are available at
http://www.linear.com/demo
PARAMETER
CONDITIONS
VALUE
Input Voltage Range
3.6V –20V
Output Voltage Range
0.6V-6V
Run/Shutdown
GND = Shutdown
V
IN
= Run
Output Voltage Regulation
V
IN
= 3.6V to 20V, I
OUT
= 0A to 2.5A
1.2V ±2% Typ. (1.176V – 1.224V)
V
IN
= 3.6V to 20V, I
OUT
= 0A to 2.5A
1.8V ±2% Typ. (1.764V – 1.836V)
V
IN
= 4V to 20V, I
OUT
= 0A to 2.5A
3.3V ±2% Typ. (3.234V – 3.366V)
Typical Output
Ripple Voltage
V
IN
= 12V, V
OUT
= 1.8V
I
OUT
= 2.5A (20MHz BW)
< 20mV
P-P
Burst Mode-to-Continuous Mode
Transition Current Values
V
IN
= 12V, V
OUT
= 1.2V
I
OUT
< 680mA
V
IN
= 12V, V
OUT
= 1.8V
I
OUT
< 880mA
V
IN
= 12V, V
OUT
= 3.3V
I
OUT
< 1.2A
Mode
Mode Pin = INTV
CC
Burst Mode
Mode = GND
FCM (Forced Continuous Mode)
Mode = Floating
Synchronized or Burst Mode
Nominal Switching Frequency
R
T
= 324k
1MHz ±20%
R
T
connected to INTV
CC
2MHz ±30%
