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LTC1844ES5-BYP Datasheet(PDF) 5 Page - Linear Technology |
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LTC1844ES5-BYP Datasheet(HTML) 5 Page - Linear Technology |
5 / 12 page 5 LTC1844 Series 1844ia IN(Pin 1): Power for LTC1844 and Load. Power is supplied to the device through the IN pin. The IN pin should be locally bypassed to ground if the LTC1844 is more than a few inches away from another source of bulk capacitance. In general, the output impedance of a battery rises with frequency, so it is usually adviseable to include an input bypass capacitor in battery-powered circuits. A capacitor in the range of 0.1 µF to 1µF is usually sufficient. The LTC1844 is designed to withstand reverse voltages on the IN pin with respect to both ground and the output pin. In the case of a reversed input, which can happen if a battery is plugged in backwards, the LTC1844 will act as if there is a large resistor in series with its input with only a small amount of current flow. GND (Pin 2): Ground and Heat Sink. Solder to a ground plane or large pad to maximize heat dissipation. SHDN (Pin 3, Fixed and SD Devices): Shutdown, Active Low. This pin is used to put the LTC1844 into shutdown. The SHDN pin current is typically less than 10nA. The SHDN pin cannot be left floating and must be tied to the input pin if not used. If reverse-battery protection is desired, the SHDN pin must be tied to the input pin through a large value resistor (10k to 1M). PI FU CTIO S ADJ (Pin 4, Adjustable Devices): Output Adjust. For the adjustable versions of the LTC1844, this is the input to the error amplifier. It has a typical bias current of 30nA flowing into the pin. The ADJ pin reference voltage is 1.25V referenced to ground. The output voltage range is 1.25V to 6V and is typically set by connecting ADJ to a resistor divider from OUT to GND. See Figure 2. BYP (Pin 4, Fixed/Pin 3, BYP Devices): Noise Bypass. The BYP pin is used to augment the internal noise filter to improve low noise performance. A small low leakage bypass capacitor from this pin to ground will filter the input of the error amplifier to lower the output voltage noise. Any value may be used; larger values will result in lower output noise, but will increase initial power-up time. Shutdown exit delay time after a brief shutdown (<10ms) will not be affected. If not used, this pin must be left unconnected. OUT (Pin 5): Voltage Regulated Output. The OUT pin supplies power to the load. A minimum output capacitor of 1 µFisrequiredtoensurestability.Largeroutputcapacitors may be required for applications with large transient loads to limit peak voltage transients. See the Applications Information section for more information on output capacitance. |
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