SP6644EU-L

® SP6644/6645 Single/Dual Alkaline Cell, High Efficiency Boost DC-DC Regulator ■ 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 V B AT 1 B AT T L 0 2 RLIM 3 SHDN 4 SP6644 SP6645 8 Pin MSOP 8 V OUT 7 LX 6 GND 4 FB Now Available in Lead Free Packaging ■ Small 8 Pin MSOP Package ■ No External FETs ■ Flexibility to Optimize Inductor Type with Programmable Peak Current Control DESCRIPTION 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 pulsefrequency-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 TYPICAL APPLICATION CIRCUIT 22µH 0.7A 0.88V to 3.3V Input VBATT 47µF LX VOUT RLIM +3.3VOUT SP6644 SP6645 47µF BATTLO SHDN FB GND Date: 11/30/04 SP6644/6645 High Efficiency Boost Regulator 1 © Copyright 2004 Sipex Corporation ABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. VBATT to GND.............................................-0.3 to 6.0V VOUT to GND..............................................-0.3 to 6.0V LX, SHDN, FB, BATTLO, to GND.............-0.3 to 6.0V Reverse battery Current, TAMB=+25˚C.............220mA (NOTE 1) VBATT forward current............................................0.5A VOUT, LX current......................................................1A Storage Temperature Range............-65˚C to +165˚C Lead Temperature (soldering 10s)..................+300˚C Operating Temperature.......................-40˚C to +85˚C Power Dissipation Per Package 8-pin µSOIC (derate 4.85mW/OC above +70OC)..........390mW ELECTRICAL CHARACTERISTICS o VBATT = VSHDN = 1.3V, ILOAD = 0mA, FB = GND, TAMB = -40 C to +85 C, and typical values are at TAMB = +25oC unless otherwise noted. PARAMETER MIN. o TYP. Maximum Operating Input Voltage, VBATT(MAX) Start-Up Input Voltage, VBATT 0.82 Start-Up Input Voltage, VBATT Temperature Coefficient -1 SHDN Input Voltage VIL VIH MAX. UNITS ♦ 3.3 V ♦ 1.1 V ♦ CONDITIONS RL = 3kΩ, mVºC 15 % % of VBATT % of VBATT 80 SHDN Input Current 1 10 0 nA ♦ FB Input Current 1 10 0 nA ♦ VFB =1.3V, FB Set Voltage, VFB 1.215 1.262 1.309 V ♦ external feedback BATTLO Falling Trip Voltage 0.94 1.88 1.00 2.00 1.06 2.12 V ♦ SP6644, VOUT = 3.3V SP6645, VOUT = 3.3V Output Voltage, VOUT 3.16 3.30 3.44 V ♦ VFB