Single/Dual Alkaline Cell DC-DC Regulator
Data Sheets OBS (Obsolete)


# of Outputs
Peak Switch Current (A)
Startup Voltage (V)
IQ (µA)
Frequency (kHz)
Efficiency (%)
Operating Temperature (°C)
Special Features
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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

Type Title Version Date File Size
Data Sheets SP6644/6645 Single/Dual Alkaline Cell, High Efficiency Boost DC-DC Regulator 1.0.0 November 2004 209.6 KB
Application Notes ANP-28, Filter Design in Continuous Conduction Mode (CCM) of Operation; Part 2 Boost Regulator A March 2006 285.9 KB
Product Brochures Power Management Brochure October 2020 2.4 MB
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Parts & Purchasing

Part Number Pkg Code Min Temp Max Temp Status Suggested Replacement PDN
SP6644EU MSOP8 -40 85 OBS
SP6644EU-L MSOP8 -40 85 OBS SP6648EU-L
SP6644EU-L/TR MSOP8 -40 85 OBS SP6648EU-L/TR
SP6644EU/TR MSOP8 -40 85 OBS
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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.


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: 50
  • 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: 1.1
  • Lead Pitch: 0.65


Distribution Date Description File
07/20/2015 Product discontinuation notification
02/28/2007 Product Obsolescence Letter and Discontinuation Notification. Discontinued.

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