Linear Technology DC1587 Demo Manual

DESCRIPTION
Demonstration circuit 1587A is a boost converter op-
timized for relatively high impedance, very low voltage
input power sources. It allows a user to quickly evaluate
the LTC3105 boost converter and LDO regulator. Capable
of operating with an input voltage as low as 250mV and
as high as 5V, the circuit features maximum power point
control (MPPC). Jumpers on the circuit board allow the
user to select several MPPC voltages, three boost output
voltages and three LDO regulator output voltages. Also
included are jumpers for shutdown and for selecting an
external pull-up voltage for the power good status output.
Terminals are provided for input and output connections,
PERFORMANCE SUMMARY
PARAMETER
Start-Up Input Voltage
Input Voltage Range
Maximum Boost Output Current
1.8V Boost Output Voltage
3.3V Boost Output Voltage
5V Boost Output Voltage
1.5V LDO Output Voltage
2.2V LDO Output Voltage
3V LDO Output Voltage
QUICK START PROCEDURE
Equipment required to evaluate the LTC3105 demonstration
circuit include a low voltage bench power supply, digital
voltmeters and suitable load resistors. Refer to Figure 1
for proper measurement equipment setup and follow the
procedure below.
Arrow.com.
Downloaded from
DC/DC Converter with Power
Point Control and LDO Regulator
power good output and external power good supply input,
shutdown input, and provisions for external MPPC resistor
and MPPC diode input.
This demonstration board is especially designed for low
power solar cell applications. The LTC3105 data sheet
gives a complete description of the part, operation and
application information. The data sheet must be read in
conjunction with this demo manual.
Design fi les for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
(T = 25°C)
A
CONDITION
No Load, R = 22k, Supply ESR = 0.5Ω, See Section 3
MPPC
After Start-Up
V = 2V, V = 5V, MPPC = 2V, Resistive Load
IN OUT
V = 1.5V, 100Ω Load
IN
V = 1.5V, 100Ω Load
IN
V = 1.5V, 100Ω Load
IN
V = 1.5V, 500Ω Load
IN
V = 1.5V, 500Ω Load
IN
V = 1.5V, 500Ω Load
IN
1. Begin by placing jumpers in the following positions.
PGOOD
VPGOOD
DEMO MANUAL DC1587
LTC3105EDD: Step-Up
VALUE
250mV Typical
0.2V to 5V
125mA
1.8V ±3%
3.3V ±3%
5V ±3%
1.5V ±3%
2.2V ±2%
3V ±3%
JP4 JP1 JP3
BOOST LDO
5V 3V
JP2 JP5
SHDN
MPPC
0.4V OFF
dc1587f
1