|# of Outputs
|Peak Switch Current (A)
|VIN MIN (V)
|VIN MAX (V)
|Startup Voltage (V)
|VOUT MIN (V)
|VOUT MAX (V)
|Operating Temperature (°C)
The SP6644/6645 devices are high-efficiency, low-power step-up DC-DC converters ideal for single or dual alkaline cell applications such as pagers, remote controls, pointing devices, medical monitors and other low-power portable end products. Designers can control the SP6644 device with an active low shutdown input. The SP6644 device features an active low output for batteries below +1.0V. The SP6645 device features an active low output for batteries below +2.0V. Both devices contain a 0.8Ω synchronous rectifier, a 0.5Ω N-channel MOSFET power switch, an internal voltage reference, circuitry for pulse-frequency-modulation and an under voltage comparator. The output voltage for the SP6644/6645 devices is preset to +3.3V ± 4% or can be adjusted from +2V to +5.5V by manipulating two external resistors.
- 90mA output current at 1.3V input
- 190mA output current at 2.6V input
- +2V to +5.5V output range
- 0.88V guaranteed start-up
- 92% high efficiency
- 1.6µA quiescent supply current at VBATT
- Reverse battery protection
- Internal synchronous rectifier
- 5nA logic controlled shutdown current from VBATT
- Low-battery detection active LOW output
- Small 8-pin MSOP package
- Flexibility to optimize inductor type with programmable peak current control
- No external FETs
Documentation & Design Tools
|SP6644/6645 Single/Dual Alkaline Cell, High Efficiency Boost DC-DC Regulator
|ANP-28, Filter Design in Continuous Conduction Mode (CCM) of Operation; Part 2 Boost Regulator
|Power Management Brochure
Parts & Purchasing
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs.
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