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LTC1261LCMS8-4 Datasheet(PDF) 5 Page - Linear Technology |
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LTC1261LCMS8-4 Datasheet(HTML) 5 Page - Linear Technology |
5 / 12 page 5 LTC1261L PIN FUNCTIONS VCC (Pin 1): Power Supply. This requires an input voltage between 2.7V and 5.25V. VCC must be bypassed to ground with at least a 1 µF capacitor placed in close proximity to the chip. See the Applications Information section for details. C1+ (Pin 2): C1 Positive Input. Connect a 0.1 µF capacitor between C1+ and C1–. C1– (Pin 3): C1 Negative Input. Connect a 0.1 µFcapacitor from C1+ to C1–. GND (Pin 4): Ground. Connect to a low impedance ground. A ground plane will help to minimize regulation errors. ADJ (COMP for fixed versions) (Pin 5): Output Adjust/ Compensation Pin. For adjustable parts this pin is used to set the output voltage. The output voltage is divided down with an external resistor divider and fed back to this pin to set the regulated output voltage. Typically the resistor string should draw ≥10µA from the output to minimize errors due to the bias current at the adjust pin. Fixed output voltage parts have the internal resistor string connected to this pin inside the package. The pin can be used to trim the output voltage if desired. It can also be used as an optional feedback compensation pin to reduce output ripple on both the adjustable and fixed output voltage parts. See the Applications Information section for more information on compensation and out- put ripple. OUT (Pin 6): Negative Voltage Output. This pin must be bypassed to ground with a 1 µF or larger capacitor. The value of the output capacitor and its ESR have a strong effect on output ripple. See the Applications Information section for more details. REG (Pin 7): This is an open-drain output that pulls low when the output voltage is within 5% of the set value. It will sink 5mA to ground with a 5V supply. The external circuitry must provide a pull-up or REG will not swing high. The voltage at REG may exceed VCC and can be pulled up to 6V above ground without damage. SHDN (Pin 8): Shutdown. When this pin is at ground the LTC1261L operates normally. An internal 5 µA pull-down keeps SHDN low if it is left floating. When SHDN is pulled high, the LTC1261L enters shutdown mode. In shut- down, the charge pump is disabled, the output collapses to 0V and the quiescent current drops to 5 µA typically. TEST CIRCUITS Fixed Output 1 2 3 4 8 7 6 5 SHDN REG OUT COMP VCC C1+ C1– GND 0.1 µF 1261L TCO1 3.3 µF VOUT = – 4V (LTC1261L-4) VOUT = – 4.5V (LTC1261L-4.5) 5V 10 µF + LTC1261L-X Adjustable Output 1 2 3 4 8 7 6 5 SHDN REG OUT ADJ VCC C1+ C1– GND VCC 0.1 µF 1261L TCO2 3.3 µF VOUT LTC1261L |
Similar Part No. - LTC1261LCMS8-4 |
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Similar Description - LTC1261LCMS8-4 |
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