SP6641A
DESCRIPTION
The SP6641 is an ultra-low quiescent current, high efficiency, DC-DC boost converter designed for single and dual cell alkaline, or Li-ion battery applications found in PDA’s, MP3 players, and other handheld portable devices. The SP6641 features a 10µA quiescent current, a 0.3Ω Nchannel charging switch, 0.9V input startup, and a 0.33A or 1.0A inductor current limiting feature
. The SP6641 is offered in a 5 pin SOT-23 package and provides an extremely small power supply footprint optimized for portable applications. The SP6641 is preset to 3.3V and can be controlled by a 1n A active LOW shutdown pin.
L1
0.9V to 4.5V VBATT VBATT 5
®
1 LX D1 2 GND 3 VOUT R1 C3
C1
U1 SP6641A SHDN SHDN
IOUT (m A)
C2
VOUT +3.3V or 5V
SP6641A 3.3V & 5V: C1 = C2 = 22µF Ceramic, L1 = 22µH CDRH5D28, D1 = MBR0520, C3 = Open, R1 = Shorted. SP6641B 3.3V & 5V: C1 = C2 = 100µF POSCAP, L1 = 10µH CDRH5D28, D1 = ZHCS2000, C3 = 1µF Ceramic, R1 = 10Ω.
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