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LTC1261 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1261 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page 1 LTC1261 S FEATURE DESCRIPTIO s Regulated Negative Voltage from a Single Positive Supply s Can Provide Regulated – 5V from a 3V Supply s REG Pin Indicates Output is in Regulation s Low Output Ripple: 5mV Typ s Supply Current: 600 µA Typ s Shutdown Mode Drops Supply Current to 5 µA s Up to 15mA Output Current s Adjustable or Fixed Output Voltages s Requires Only Three or Four External Capacitors s Available in SO-8 Packages The LTC ®1261 is a switched-capacitor voltage inverter designed to provide a regulated negative voltage from a single positive supply. The LTC1261CS operates from a single 3V to 8V supply and provides an adjustable output voltage from –1.25V to – 8V. An on-chip resistor string allows the LTC1261CS to be configured for output volt- ages of – 3.5V, – 4V, – 4.5V or – 5V with no external components. The LTC1261CS8 is optimized for applica- tions which use a 5V or higher supply or which require low output voltages. It requires a single external 0.1 µF capacitor and provides adjustable and fixed output voltage options in 8-pin SO packages. The LTC1261CS requires one or two external 0.1 µF capacitors, depending on input voltage. Both versions require additional external input and output bypass capacitors. An optional compensation capacitor at ADJ/COMP can be used to reduce the output voltage ripple. Each version of the LTC1261 will supply up to 12mA output current with guaranteed output regulation of 5%. The LTC1261 includes an open-drain REG output which pulls low when the output is within 5% of the set value. Output ripple is typically as low as 5mV. Quiescent current is typically 600 µA when operating and 5µA in shutdown. The LTC1261 is available in a 14-pin narrow body SO package and an 8-pin SO package. Switched Capacitor Regulated Voltage Inverter s GaAs FET Bias Generators s Negative Supply Generators s Battery-Powered Systems s Single Supply Applications S APPLICATI TYPICAL APPLICATION – 4V Generator with Power Valid , LTC and LT are registered trademarks of Linear Technology Corporation. 1 2 3 4 8 7 6 5 LTC1261-4 SHDN REG OUT COMP VCC C1+ C1– GND C2 0.1 µF LTC1261 • TA01 C4 3.3 µF VOUT = –4V AT 10mA POWER VALID 5V C1 1 µF 5V 10k C3* 100pF *OPTIONAL Waveforms for – 4V Generator with Power Valid 0V OUT –4V 5V SHDN 0V 5V POWER VALID 0V 0.2mS/DIV LTC1261 • TAO2 |
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