LTC3111EDHD Datasheet, PDF (1/6 Pages) Linear Technology – 15V, 1.5A Synchronous Buck-Boost DC/DC Converter

DEMO MANUAL DC1999A
LTC3111EDHD
15V, 1.5A Synchronous
Buck-Boost DC/DC Converter
DESCRIPTION
Demonstration circuit 1999A is a fixed frequency syn-
chronous buck-boost converter with an extended input
and output range. The unique 4-switch, single inductor
architecture provides low noise and seamless operation
from input voltages above, below, or equal to the output
voltage.
The LTC^®3111 features selectable PWM or Burst Mode^®
operation, and an easily synchronizable oscillator. Jumper
JP1 is provided to enable the converter. The demo board
is configured for 800kHz. A jumper, JP2, is provided to
select PWM, or Burst Mode operation. A clock signal can
also be applied to JP2 if synchronization is desired.
The LTC3111 operates with a 2.5V to 15V input voltage
range and a V_OUT range from 2.5V to 15V. The demon-
stration board has been designed to operate with V_IN
from 2.5V to 15V and an output current up to 1.5A. For
V_IN < 5V, I_OUT capability is reduced. V_OUT is set to 5.0V.
Typical demo board efficiency is shown in Figure 2 for
several loads. The demo board has the provision to set an
accurate run threshold. Consult the LTC3111data sheet for
more information. The transient response of the converter
to a 100mA to 600mA transient at input voltages of 3.5V
and 12V are presented in Figures 3 and 4.
The LTC3111 data sheet has detailed information about
the operation, specifications, and applications of the part.
The data sheet should be read in conjunction with this
Quick Start Guide.
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.
PERFORMANCE SUMMARY
Specifications are at T_A = 25°C
INPUT VOLTAGE RANGE
2.5V to 15V
V_OUT
5V
I_OUT
1.5A for V_IN > 5V
dc1999af
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