Single/Dual Alkaline Cell DC-DC Regulator


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.

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  • 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


Design Tools

Technical Library


Pkg Code Details Quantities Dimensions PDF
  • JEDEC Reference: MO-220
  • MSL Pb-Free: L1 @ 260°C
  • MSL SnPb Eutectic:
  • ThetaJA: 163
  • Bulk Pack Style: Tube
  • Quantity per Bulk Pack:
  • Quantity per Reel: 2500
  • Quantity per Tube: 50
  • Quantity per Tray: n/a
  • Reel Size (Dia. x Width x Pitch): 330x12x8
  • Tape & Reel Unit Orientation: Quadrant 1
  • Dimensions: mm
  • Length: 3
  • Width: 3
  • Thickness: 0.85
  • Lead Pitch: 0.65

Parts & Purchasing

Part Number Pkg Code RoHS Min Temp Max Temp Status Buy Now Order Samples
SP6644EU MSOP8 -40 85 OBS
SP6644EU/TR MSOP8 -40 85 OBS
SP6644EU-L MSOP8 -40 85 OBS Suggested:
SP6644EU-L/TR MSOP8 -40 85 OBS Suggested:
Show obsolete parts
Part Status Legend
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.
Distribution Date Description File
07/20/2015 Product discontinuation notification PDN_15-0105-01-1033.pdf
02/28/2007 Product Obsolescence Letter and Discontinuation Notification. Discontinued. POL_022807-1033.pdf