Linear Technology 1215 Quick Start Manual

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 1215
5A, 15V, MONOLITHIC SYNCHRONOUS STEP-DOWN REGULATOR
DESCRIPTION DESCRIPTION DESCRIPTION DESCRIPTION
Demonstration circuit 1215 is a step-down con-
verter, using the LTC3605 monolithic synchronous
buck regulator. The DC1215A has a maximum input
voltage 15V, and is capable of delivering up to 5A of
output current at a minimum input voltage of 4V.
The output voltage of the DC1215A can be set as
low as 0.6V, the reference voltage of the LTC3605.
At low load currents, the DC1215A operates in dis-
continuous mode, and during shutdown, it con-
sumes less than 10 uA of quiescent current. In
continuous mode operation, the DC1215A is a high
efficiency circuit - over 80%. The LTC3605 has
phase lock circuits, allowing high current multi-
phase operation of several DC1215As in parallel.
Table 1. Performance Summary (T A = 25°C)
PARAMETER
Minimum Input Voltage
Maximum Input Voltage
Run/Shutdown
Output Voltage V OUT Regulation
Typical Output Ripple V OUT
Discontinuous Mode
Nominal Switching Frequency
CONDITIONS
V IN = 4V to 15V, I OUT = 0A to 5A
V IN = 4.5V to 15V, I OUT = 0A to 5A
V IN = 6.4V to 15V, I OUT = 0A to 5A
V IN = 12V, V OUT = 2.5V, I OUT = 2.5A (20 MHz BW)
V IN = 12V, V OUT = 2.5V
R T = 162k
The DC1215A can also track another voltage with
the LTC3605 track function. Because of the high
switching frequency of the LTC3605, which is pro-
grammable up to 4 MHz, the DC1215A uses low
profile surface mount components. All these fea-
tures make the DC1215A an ideal circuit for use in
industrial applications and distributed power sys-
tems. Gerber files for this circuit are available.
Call the LTC Factory.
Design files for this circuit are available. Call
the LTC Factory.
LTC is a trademark of Linear Technology Corporation
LTC3605
VALUE
4V
15V
GND = Shutdown
V IN = Run
2.5V ±4% (2.4V – 2.6V)
3.3V ±4% (3.168V – 3.432V)
5V ±4% (4.8V – 5.2V)
< 40mV P–P
< 2A
1 MHz
1