This PV has the same inline voltage regulator as my 2 button Multi
volt Detonator. Accept it only works at 5 volts with 2 CR2's
The regulator does not allow CR2 batteries to discharge below 2.5 Volts.
Rapid Discharge of CR2 batteries is not good for the battery and may lead to battery venting.
I liked the 2 button design- but was worried my Fiance might discharge the CR2's too far. With the regulator only allowing the batteries to go down to 2.5 volts rapid discharge or battery venting issues are eliminated.
Although care must still be taken while charging CR2's
These are the specs on the regulator- I use the 3 lead version.
Product Information Features
- Precision Positive Linear Series Pass Voltage Regulation
- 0.45 V Dropout at 3 A
- 50 mV Dropout at 10 mA
- Quiescent Current Under 650 µA Irrespective of Load
- Adjustable (5-Lead) Output Voltage Version
- Fixed (3-Lead) Versions for 3.3-V and 5-V Outputs
- Logic Shutdown Capability
- Short-Circuit Power Limit of (3% × VIN × ISHORT)
- Low VOUT to VIN Reverse Leakage
- Thermal Shutdown
Description
The XXX–3/–5/–ADJ family of positive linear series pass voltage regulators are tailored for low-drop-out applications where low quiescent power is important. Fabricated with a BiCMOS technology ideally suited for low input-to-output differential applications, the XXX–5 passes 3 A while requiring only 0.45 V of typical input voltage headroom (ensured 0.6-V dropout).
These regulators include reverse voltage sensing that prevents current in the reverse direction. Quiescent current is always less than 650 µA. These devices have been internally compensated in such a way that the need for a minimum output capacitor has been eliminated.
XXX–3 and XXX–5 versions are in 3-lead packages and have preset outputs at 3.3 V and 5.0 V respectively. The output voltage is regulated to 1.5% at room temperature. The XXX–ADJ version, in a 5-lead package, regulates the output voltage programmed by an external resistor ratio.
Short-circuit current is internally limited. The device responds to a sustained overcurrent condition by turning off after a tON time delay. The device then stays off for a period, tOFF, that is 32 times the tON delay. The device then begins pulsing on and off at the tON/(tON +tOFF) duty cycle of 3%. This drastically reduces the power dissipation during short-circuit and means heat sinks need only accommodate normal operation. On the 3-leaded versions of the device tON is fixed at 750 µs, on the adjustable 5-leaded versions an external capacitor sets the on time. The off time is always 32 × tON. The external timing control pin, CT, on the 5-leaded versions also serves as a shutdown input when pulled low.
Internal power dissipation is further controlled with thermal overload protection circuitry. Thermal shutdown occurs if the junction temperature exceeds 165°C. The chip remains off until the temperature has dropped 20°C.
The XXX series is specified for operation over the industrial range of –40°C to 85°C, and the XXXseries is specified from 0°C to 70°C. These devices are available in 3- and 5-pin TO–220 and TO–263 power packages.
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Not much bigger that a Bic lighter.
Power Lock Out- For carrying in pocket.
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