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TK65025 Datasheet(PDF) 1 Page - TOKO, Inc |
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TK65025 Datasheet(HTML) 1 Page - TOKO, Inc |
1 / 12 page 2 February, 1997 Toko, Inc. Page 1 TK65025 VIN VOUT CONT ROL CIRCUIT GND RC OSC. IND RESET VREF UVLO 1 3 4 6 2,5 BLOCK DIAGRAM TK65025M Tape/Reel Code TAPE/REEL CODE BX : Bulk/Bag TL : Tape Left ORDERING INFORMATION DESCRIPTION The TK65025 Low Power Step-Up DC-DC converter is designed for portable battery-powered systems, capable of operating from a single battery cell down to 0.9 V. The TK65025 provides the power switch and the control circuit for a boost converter. The converter takes a DC input and boosts it up to 3 volts. This regulated 3 volt output is typically used to supply power to a microprocessor-con- trolled system. The output voltage is laser-trimmed to 3.0 V. An internal detector monitors the output voltage and provides an active-low microprocessor reset signal whenever the output voltage falls below an internally preset limit. An internal undervoltage lockout circuit is utilized to prevent the inductor switch from remaining in the "ON" mode when the battery voltage is too low to permit normal operation. Pulse burst modulation (PBM) is used to regulate the voltage at the VOUT pin at the IC. PBM is the process in which an oscillator signal is gated or not gated to the switch drive each period. The decision is made just before the start of each cycle and is based on comparing the output voltage to an internally-generated bandgap reference. The decision is latched, so the duty ratio is not modulated within a cycle. The average duty ratio is effectively modulated by the "bursting" and skipping of pulses which can be seen at the IND pin of the IC. Special care has been taken to achieve high reliability through the use of Oxide, double Nitride passivation. The TK65025 is available in a very small plastic surface mount package. (SOT-23L) Customized levels of accuracy in oscillator frequency and output voltage are available. TK65025M 1 3 6 4 2 5 VIN IND GND GND RESET VOUT M25 STEP-UP VOLTAGE CONVERTER WITH VOLTAGE MONITOR APPLICATIONS s Battery Powered Systems s Cellular Telephones s Pagers s Personal Communications Equipment s Portable Instrumentation s Portable Consumer Equipment s Radio Control Systems FEATURES s Guaranteed 0.9 V Operation s Very Low Quiescent Current s Internal Bandgap Reference s High Efficiency MOS Switching s Low Output Ripple s Microprocessor Reset Output s Laser-Trimmed Output Voltage s Laser-Trimmed Oscillator s Undervoltage Lockout s Regulation by Pulse Burst Modulation (PBM) |
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