Linear Technology DC1737A Demo Manual

DESCRIPTION
Demonstration circuit 1737A is a current-mode inverting
DC/DC converter featuring the
The board operates from an input range of 4.5V to 16V,
and provides a –5.2V, 1.7A output or a –12V, 1A output
(jumper selectable). It operates at 400kHz and may be
synchronized to an external clock. A soft-start feature
controls output voltage slew rate at start-up, reducing
current surge and voltage overshoot. Burst Mode
tion that improves efficiency at light loads can be enabled
with a jumper. A power good output signal is provided.
The demonstration board has options for larger MOSFET
and diode packages on the back of the board for higher
output current requirements.
PERFORMANCE SUMMARY
SYMBOL PARAMETER
V Input Supply Range
IN
V Output Voltage
OUT
I Output Current Range, Continuous
OUT
f Switching (Clock) Frequency
SW
V Output Ripple
OUT P-P
V Output Regulation
REG
P /P Efficiency (See Figure 3)
OUT IN
Approximate Size
LTC 3863.
®
opera-
®
Specifications are at T
CONDITIONS
Free Air
V = 12V, V = –12V, I
IN OUT
Line and Load (4.5V
V = 12V, V = –12V, I
IN OUT
Component Area × Top Component Height
DEMO MANUAL DC1737A
DC/DC Converter
This board is suitable for a wide range of automotive,
telecom, industrial, and other applications. The LTC3863
is available in small 12-pin thermally enhanced MSOP and
DFN Packages. For other output requirements, see the
LTC3863 data sheet or contact the LTC factory.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
= 25°C
A
= 1A (20MHz BW)
OUT
to 16V , –12V , 0A to 1A Out)
IN IN OUT
= 1A
OUT
LTC3863
Low I Inverting
Q
MIN TYP MAX
4.5 16
–5.2V/–12V
0 –1.7/1.0
400
30
±0.1
89.3
0.9 × 0.8 × 0.18
UNITS
V
V
A
kHz
mV
P-P
%
%
Inches
dc1737af
1