Analog Devices DC2585A Manual

DESCRIPTION
Demonstration circuit 2585A contains two circuits fea-
turing the LTC 3290. The top LTC3290 circuit operates
®
as a high voltage boost by using the power from two
input supplies to create a higher output voltage. The bot-
tom LTC3290 circuit operates as a V
using the power from an auxiliary supply input (V
regulating a voltage above the V
V /V range allows two voltages to be used together
IN AUX
to efficiently create a third voltage, boost from a single
supply to boost, or regulate above a variable input voltage
like a battery.
The high efficiency boost circuit has three selectable out-
puts, 15V, 24V, or 42V. If a different output is desired then
the top resistor, R2, and/or the bottom resistor, R6, can
be changed to provide a different output voltage. Refer
to the LTC3290 data sheet and demo board schematic
for more information on how to set the output voltage
for the LTC3290.
PERFORMANCE SUMMARY
SYMBOL PARAMETER
V V Input Voltage Range
IN IN
V V Input Voltage Range
AUX AUX
V +V Sum of Input Voltage Range
IN AUX
V V Output Voltage Range
OUT1 OUT
(High Efficiency Boost Circuit)*
V V Output Voltage Range
OUT2 OUT
(V Tracking Circuit)*
IN
*R is the effective open loop resistance and is typically about 65Ω. Refer to the Available Output Current section of the LTC3290 data sheet for more
OL
information about this.
High Voltage Boost Charge Pump
tracking supply by
IN
) and
AUX
supply input. The wide
IN
Specifications are at T
CONDITIONS
V + V ≥ 15V + R
IN1 AUX1 OL
V + V ≥ 24V + R
IN1 AUX1 OL
V + V ≥ 42V + R
IN1 AUX1 OL
V ≥ 5V + R • I , JP4 = V
AUX2 OL OUT
V ≥ 10V + R • I , JP4 = V
AUX2 OL OUT
V ≥ 15V + R • I , JP4 = V
AUX2 OL OUT
DEMO MANUAL DC2585A
The V tracking circuit also has three selectable outputs,
IN
V + 5V, V + 10V, and V
IN2 IN2
voltage is desired, then R9 and/or R13 can be changed
to set a different output. Refer to the LTC3290 data sheet
for more information on how to set the output voltage in
V tracking mode.
IN
The LTC3290 can use two separate supplies or a single
supply connected to both inputs for either circuit. This
can be useful to boost or track a battery voltage with a
regulated output.
The LTC3290 data sheet gives a complete description of
the device, operation and application information. The data
sheet must be read in conjunction with this demo manual.
Design files for this circuit board are
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= 25°C
A
MIN
4.5
4.5
9
• I , JP1 = 15V 14.5
OUT
• I , JP1 = 24V 23.3
OUT
• I , JP1 = 42V 40.8
OUT
+ 5V V + 4.80
IN2 IN2
+ 10V V + 9.7
IN2 IN2
+ 15V V + 14.55
IN2 IN2
LTC3290
+ 15V. If a different output
IN2
available.
TYP MAX UNITS
50.5
50.5
55
15 15.5
24 24.7
42 43.2
V + 5 V + 5.15
IN2 IN2
V + 10 V + 10.3
IN2 IN2
V + 15 V + 15.45
IN2 IN2
V
V
V
V
V
V
V
V
V
Rev. 0
1