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MAX689CSA Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX689CSA Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 12 page _______________General Description The MAX687/MAX688/MAX689 low-dropout linear regula- tors operate with an input-to-output voltage differential lim- ited only by an external PNP transistor. Outputs are fixed at 3.3V (MAX687/MAX688) or 3.0V (MAX689). The only external components required are a PNP pass transistor and output, compensation, and bypass capacitors. Base drive to the external transistor is at least 10mA, permitting output currents to exceed 1A when using high-gain tran- sistors ( β > 100). Output current limiting is implemented by limiting the external transistor’s base current. Output voltage monitoring and shutdown functions are included. The 3.3V MAX687 automatically shuts down whenever the output voltage drops below 2.96V. An internal power-fail comparator also monitors the output and pro- vides an early warning of low output voltage before the device shuts down. When shut down, the output is latched off until the ON input is pulsed. Turning off the power supply in this way prevents battery damage due to excessive discharge or cell-reversal. Typical applica- tions include portable telephones and other battery-pow- ered equipment where the power supply must be disabled when the battery voltage is low. The MAX688 and MAX689 do not have an automatic shutdown function, and are identical except for their output voltages. Each device has an active-low shut- down-control input, used to turn its output on or off at any time. As SHDN falls, the device enters a standby mode before fully shutting down. When in standby, the reference and comparators are fully operational, per- mitting the transition from normal mode to standby mode to occur at a precise voltage level on SHDN. ________________________Applications High-Efficiency Linear Regulator Battery-Powered Devices Portable Instruments Portable Telephones Power Supply or Backup Supply for Memory ____________________________Features o Fixed Outputs: 3.3V (MAX687/MAX688) 3.0V (MAX689) o Directly Drives External PNP Transistor o 10mA Min Base-Current Drive for >1A Output o Low Dropout Voltage: 100mV Dropout at 650mA Output (FZT749) 40mV Dropout at 200mA Output (FZT749) 0.8V Dropout at 4A Output o Power-Fail Output Monitors the Output Voltage o Automatic, Latched Shutdown when Output Falls Out of Regulation (MAX687) o Precision Threshold Shutdown Control (MAX688/MAX689) o Low Supply Current: 150µA Operating <1µA Shutdown o 2.7V to 11.0V Supply Range o 8-Pin DIP/SO/µMAX Packages o <2mV Line Transient with 3.4V to 3.6V Input o Output Accuracy <±2% ______________Ordering Information Ordering Information continued at end of data sheet. High-Accuracy, Low-Dropout Linear Regulators ________________________________________________________________ Maxim Integrated Products 1 MAX687 Q1 FZT749 RB 12 Ω BASE GND C1 2.2 µF IN BLIM OUT POWER-FAIL OUTPUT 3.3V @ 500mA PFO CC +3.5V to +5V INPUT ON C3 10nF ON GND C2 68 µF __________Typical Operating Circuit 1 2 3 4 8 7 6 5 CC BASE BLIM OUT GND PFO (ON) SHDN IN MAX687 MAX688 MAX689 DIP/SO/ µMAX TOP VIEW ( ) ARE FOR MAX687 __________________Pin Configuration Call toll free 1-800-998-8800 for free samples or literature. 19-0329; Rev 0; 12/94 PART MAX687CPA MAX687CSA MAX687CUA 0°C to +70°C 0°C to +70°C 0°C to +70°C TEMP. RANGE PIN-PACKAGE 8 Plastic DIP 8 SO 8 µMAX EVALUATION KIT MANUAL FOLLOWS DATA SHEET MAX687EPA MAX687ESA -40°C to +85°C -40°C to +85°C 8 Plastic DIP 8 SO |
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