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TK65431M Datasheet(PDF) 1 Page - TOKO, Inc |
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TK65431M Datasheet(HTML) 1 Page - TOKO, Inc |
1 / 28 page September 1999 TOKO, Inc. Page 1 TK654xx ADVANCED INFORMATION VOUT VIN LBO LBI/SB SW CONTROL CIRCUIT BATTERY MONITOR REF LBO OFF GND FEATURES s Minimum External Component Count (1 coil, 1 cap) s Miniature 6 Pin SOT23L-6 Surface Mount Package s Up To 95% Efficient s Extremely Low Operating Current (24 µA) s Low Quiescent Current (18 µA) s Low Ripple s Fast Transient Response s Linear Dropout Characteristics s Short Circuit Protection s Regulates Down to 1.8 V s Synchronous Rectification s Internal Battery Monitor BLOCK DIAGRAM TK654xxM VOUT LBO VIN SW GND LBI/SB ORDERING INFORMATION TAPE/REEL CODE TL: Tape Left Tape/Reel Code TK654xxM Voltage Code VOLTAGE CODE 18 = 1.8 V 21 = 2.1 V 24 = 2.4 V 25 = 2.5 V 27 = 2.7 V 30 = 3.0 V 33 = 3.3 V ADVANCED INFORMATION APPLICATIONS s Battery Powered Systems s Cellular Telephones s Pagers s Personal Communications Equipment s Radio Controlled Systems s Toys STEP-DOWN CONVERTER WITH BATTERY MONITOR DESCRIPTION The TK654xx low power step-down converter is designed for portable battery systems, capable of operating from a single Li-ion battery cell or multiple alkaline or rechargeable (NiCd or NiMH) battery cells (up to 6 V). The TK654xx provides the power switch, synchronous rectifier, and the control circuit for a buck step-down converter. Only two external components are required to complete the step- down conversion. The TK654xx provides laser-trimmed output voltages ranging from 1.8 V to 3.3 V. The low resistance MOSFET switch and synchronous rectifier allow average currents up to 200 mA, while maintaining peak efficiencies up to 95%. A low-battery threshold and turn-off threshold can be individually programmed by the user, utilizing a single resistor divider connected to the Low Battery Input (LBI) pin. When the resistively-divided supply voltage on the LBI pin drops below approximately 1.22 V, the Low Battery Output (LBO) pin will become asserted. The dual-function LBI pin can alternatively be used as a Standby (SB) pin. Driving the SB pin low will disable the TK654xx and drop the quiescent current on the input supply to approximately 18 µA. Pulse Current Amplitude control is used to regulate the voltage at the V OUT pin of the IC. When the output voltage of the TK654xx drops below the regulation threshold, a current pulse is transferred from the input supply to the output. The TK654xx utilizes a proprietary control scheme, where the average amplitude of the current pulse is varied depending upon the current loads. The proprietary architecture allows fast transient response and minimal ripple while maintaining ease-of-use and low component count. The TK654xx is available in a miniature 6-pin SOT23L-6 surface mount package. |
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