nN | LTC1044CS8 TECHNOLOGY FEATURES # Plug-In Compatible with 7660 with These Additional Features: e Guaranteed Operation to 9V, with No External Diode, Over Full Temperature Range e Boost Pin (Pin 1) for Higher Switching Frequency e Lower Quiescent Power e Efficient Voltage Doubler @ 200nA Max. No Load Supply Current at 5V # 97% Min. Open Circuit Voltage Conversion Efficiency = 95% Min. Power Conversion Efficiency = Wide Operating Supply Voltage Range, 1.5V to 9V m Easy to Use = Commercial Device Guaranteed Over 40C to 85C Temperature Range APPLICATIONS = Conversion of +5V to +5V Supplies w Precise Voltage Division, Vour =Vin /2 + 20ppm # Voltage Multiplication, Vout = + nVin = Supply Splitter, Vour = +Vs/2 switched Capacitor Voltage Converter DESCRIPTION The LTC1044 is a monolithic CMOS switched capacitor voltage converter which is manufactured using Linear Technologys enhanced LTCMOS silicon gate process. The LTC1044 provides several voltage conversion func- tions: the input voltage can be inverted (Vout = Vin), doubled (VouT = 2Vin), divided (Vout =Vin / 2) or multi- plied (VouT = +nVin). Designed to be pin-for-pin and functionally compatible with the popular 7660, the LTC 1044 provides significant features and improvements over earlier 7660 designs. These improvements include: full 1.5V to 9V supply op- eration over the entire operating temperature range, with- out the need for external protection diodes; 2 times lower quiescent current for greater power conversion effi- ciency; and a boost function which is available to raise the internal oscillator frequency to optimize performance in specific applications. Although the LTC1044 provides significant design and performance advantages over the earlier 7660 device, it still maintains its compatibility with existing 7660 designs. LTCMOS is a trademark of Linear Technology Corp. Generating CMOS Logic Supply from 2 Mercury Batteries Supply Current vs Supply Voltage 400 360 320 280 RL = 00 21.2V ae CELLS TT C1 ead. oT 240 200 160 GUARANTEED SUPPLY CURRENT Ig = 3pA = 3 z NO LOAD INPUT CURRENT, Ig 11} 120 POINT TYPICAL p 3 o 6 o 012 3 4 5 67 8 910 SUPPLY VOLTAGE, V+ (V) LI We 5-21 LTC1044CS8 ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Notes 1 and 2) ORDER Supply Voltage ......0.0.0 00. eee eee eee 9.5V ToP VIEW PART NUMBER Input Voltage on Pins 1, 6 and 7 ra] v+ (Note 2)... 0... ee. ~0.3V