TC962 High Current Charge Pump DC-to-DC Converter Features: General Description: Pin Compatible With TC7662/ICL7662/SI7661 The TC962 is an advanced version of the industry standard TC7662 high voltage DC-to-DC converter. High Output Current 80 mA Using improved design techniques and CMOS No External Diodes Required construction, the TC962 can source as much as 80 mA Wide Operating Range 3V to 18V versus the 7662s 20 mA capability. Low Output Impedance 28 Typ. As an inverter, the TC962 can put out voltages as high No Low Voltage Terminal Required as 18V and as low as 3V without the need for external Application Zener On-Chip diodes. The output impedance of the device is a low OSC Frequency Doubling Pin Option for Smaller 28 (with the proper capacitors), voltage conversion Output Capacitors efficiency is 99.9%, and power conversion efficiency is 97%. Applications: The low voltage terminal (pin 6) required in some TC7662 applications has been eliminated. Grounding Laptop Computers this terminal will double the oscillator frequency from 12 Disk Drives kHz to 24 kHz. This will allow the use of smaller Process Instrumentation capacitors for the same output current and ripple, in P-Based Controllers most applications. Only two external capacitors are required for inverter applications. In the event an external clock is needed to drive the TC962 (such as Device Selection Table paralleling), driving this pin directly will cause the Operating Part internal oscillator to sync to the external clock. Package Temp. Number Pin 1, which is used as a test pin on the 7662, is a Range voltage reference Zener on the TC962. This Zener (6.4V TC962COE 16-Pin SOIC Wide 0C to +70C at 5 mA) has a dynamic impedance of 12and is TC962CPA 8-Pin Plastic DIP 0C to +70C intended for use where the TC962 is supplying current to external regulator circuitry and a reference is needed for TC962EPA 8-Pin Plastic DIP -40C to +85C the regulator circuit. (See Section 3.0 Applications TC962IJA 8-Pin CERDIP -25C to +85C Information Applications Information). TC962MJA 8-Pin CERDIP -55C to +125C The TC962 is compatible with the LTC1044, SI7661 and ICL7662. It should be used in designs that require greater power and/or less input to output voltage drop. It offers superior performance over the ICL7660S. Package Type 16-Pin SOIC Wide Zener 1 16 V DD Cathode 8-Pin DIP 8-Pin CERDIP 2 15 NC NC + Zener C 3 14 C OSC V 1 8 DD Cathode NC 4 13 NC + TC962CPA C C 2 7 OSC TC962COE TC962EPA GND 5 12 FREQ x 2 3 6 GND FREQ x 2 TC962IJA 6 11 NC NC C 4 5 V TC962MJA OUT C 7 10 V OUT 8 9 NC NC 2001-2012 Microchip Technology Inc. DS21484D-page 1TC962 Functional Block Diagram 8 V DD 6 I I FREQ x 2 TC962 7 OSC/C Timing Level P SW1 Shift Q 2 + + F/F CAP C Q Level + N SW4 Shift C P Comparator External with Hysteresis 3 GND 1 Zener V Cathode REF 6.4V + OUT C R Level N SW2 EXT Shift 4 CAP R L Level N SW3 Shift 5 V OUT DS21484D-page 2 2001-2012 Microchip Technology Inc.