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The boost converter maintains a 6.0V output from the 3V lithium battery. The boost converter
operates at 2.4MHz and provides a well filtered output with minimal switching noise. The boost
converter can provide up to 1.25A to the load and is short circuit protected.
The load bypass switch is power MOSFET that sends the 6V input current directly to the output
when the 6V input is present. If the 6V input is not present, then the load bypass switch turns off
while the boost converter turns on and provides the 6V output.
If the input voltage falls below the low-voltage threshold, the load bypass switch turns off and the
boost converter will turn on. When the voltage rises above the low-voltage threshold, the boost
converter will turn back off and the load switch will turn on to provide current directly from the
power source to the load.
The supervisor circuit contains the switch threshold voltage sensors and the LED status monitors.
The supervisor circuit determines whether or not the boost converter will turn on if the input
voltage is not present. The push-button switch operation toggles between battery power on, or
battery off. With no input voltage present, the push-button switch can toggle the boost converter
to be on. Then when the dc input is applied, the boost converter will turn off and the input power
will go directly to the load and the battery charging circuit. If the input power is removed again, the
boost converter will automatically take over and supply energy from the battery to the load.
Pressing the push-button one more time will toggle the output to off.
2 Electrical Specifications
Input Voltage Range
Output Voltage
Boost converter off
Boost converter on
Output Voltage Noise
Input Current
Maximum Current Charging with Load
Low Voltage Threshold
DC Input and Output Connectors
Output Current
Battery Capacity
Operating Temperature
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Absolute Max
Operational Max
Operational Min
Output voltage will track input voltage -~75mV when input voltage is above
Output voltage will be 6.00V ± 50mV when input voltage is below low-
<20mV pk-pk in 0Hz to 100MHz BW 0.5A load
Maximum Charge
No load Boost off
Hirose DF3A-2P-2DS
Mates with Hirose DF3-2S-2C plug and pre-crimped wire H2BXT-10112-R4
(red) and H2BXT-10112-B4 (black). 20" dc cable s supplied with synthesizer,
additional cables available.
1.25A max
Charging
+10V, -10V
+6.5 charging and load connected
+4.5V charging only (no load connected)
low voltage threshold
voltage threshold.
800mA No external load
2.05A
< 10mA (battery fully charged)
3V
0.5Amps output (6V) for ~ 2hours
0~40 ⁰ C
4
5/13/2016
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