SP6641A_05

® SP6641A/6641B 500mA Alkaline DC/DC Boost Regulator in SOT-23 ■ Ultra Low Quiescent Current: 10µA ■ Wide Input Voltage Range: 0.9V to 4.5V ■ 90mA IOUT at 1.3V Input (SP6641A-3.3V) ■ 500mA IOUT at 2.6V Input (SP6641B-3.3V) ■ 100mA IOUT at 2.0V Input (SP6641A-5.0V) ■ 500mA IOUT at 3.3V Input (SP6641B-5.0V) ■ Fixed 3.3V or 5.0V Output Voltage ■ Up to 87% Efficiency ■ 0.3Ω NFET RDSon ■ Startup Voltage Guaranteed at 0.9V ■ 0.33A Inductor Current Limit (SP6641A) ■ 1A Inductor Current Limit (SP6641B) ■ Logic Shutdown Control ■ SOT-23-5 Package LX 1 5 VBATT SP6641 GND 2 5 Pin SOT-23 VOUT 3 4 SHDN APPLICATIONS ■ PDA's ■ DSC's ■ CD/MP3 Players ■ Pagers ■ Digital Cameras ■ Portable Handheld Medical Devices Now Available in Lead Free Packaging 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 1nA 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 (mA) 4 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. 700 650 600 550 500 450 400 350 300 250 200 150 100 50 0 1.0 SP6641B, 1.0A, 3.3V SP6641B, 1.0A, 5V SP6641A, 0.33A, 3.3V SP6641A, 0.33A, 5V 1.5 2.0 2.5 3.0 3.5 4.0 4.5 VIN (V) Figure 1. Typical Application Schematic Rev. 5/26/05, *Patent Pending Figure 2. Maximum Load Current in Operation © Copyright 2002 Sipex Corporation SP6641A/6641B 500mA Alkaline DC/DC Boost Regulator in SOT-23 1 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. LX, VOUT, SHDN, VBATT to GND pin ....... -0.3 to 6.0V LX Current .......................................................... 1.5A Reverse VBATT Current ................................... 220mA Storage Temperature ........................ -65°C to 150°C Operating Temperature ..................... -40°C to +85°C Lead Temperature (Soldering, 10 sec) .......... 300 °C ELECTRICAL SPECIFICATIONS VBATT = VSHDN = 1.3V, ILOAD = 0mA, -40°C