Linear Technology DC1516A Manual

DESCRIPTION
Demonstration circuit 1516A is a 1.5V/15A synchronous
buck converter operating with a switching frequency of
300kHz over an input voltage range of 4.5V to 24V. The
demo board comes in two versions. The -A version uses
inductor DCR current sensing with an iron powder inductor
for highest efficiency. The -B version uses a 2.5mΩ/1%
sense resistor for accurate current sensing with a low
DCR ferrite inductor. The fixed on-time valley current
®
mode control of the LTC
response (see Figures 4 and 5). The load step response
can be tested with the on-board load step circuit and a
bench pulse generator.
PERFORMANCE SUMMARY
PARAMETER
Minimum Input Voltage
Maximum Input Voltage
Output Voltage
Switching Frequency
Efficiency
DCR SENSE Version (-A)
R Version (-B)
SENSE
3833 allows for a fast load step
(T = 0°C to 85°C)
A
CONDITIONS/NOTES
I = 0A to 15A
OUT
V = 12V, V
IN OUT
See Figures 2 and 3
DEMO MANUAL DC1516A
High Efficiency Step-Down
Other features of the board include a MODE jumper to
program either DCM or CCM with light or no load, a PLLIN
input for synchronizing the converter to an external clock,
a TRACK/SS pin, a PGOOD pin and an EXTV
The demo board uses a high density, two-sided drop-in
layout. The entire converter, excluding the bulk output and
input capacitors, fits within a compact 1.25" × 0.5" area
on the board. The package style for the LTC3833EFE is a
20-lead TSSOP with an exposed ground pad.
Design files for this circuit board are available at
http://www.linear.com/demo
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.
= 1.5V, I = 15A
OUT
LTC3833EFE
Wide Input Range,
DC/DC Converter
VALUE
4.5V
24V
1.5V ±2%
300kHz
89.4%
87.8%
pin.
CC
dc1516af
1