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LT1672 Datasheet(PDF) 6 Page - Linear Technology |
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LT1672 Datasheet(HTML) 6 Page - Linear Technology |
6 / 24 page LTC3109 6 3109fa LDO Step Load Response Enable Input and VOUT2 Running on Storage Capacitor PIN FUNCTIONS (QFN/SSOP) VSTORE (Pin 1/Pin 3): Output for the Storage Capacitor or Battery. A large storage capacitor may be connected from this pin to GND for powering the system in the event the input voltage is lost. It will be charged up to the maximum VAUX clamp voltage. If not used, this pin should be left open or tied to VAUX. VAUX (Pin 2/Pin 4): Output of the Internal Rectifier Cir- cuit and VCC for the IC. Bypass VAUX with at least 1μF of capacitance to ground. An active shunt regulator clamps VAUX to 5.25V (typical). VOUT (Pin 3/Pin 5): Main Output of the Converter. The voltage at this pin is regulated to the voltage selected by VS1 and VS2 (see Table 1). Connect this pin to a reservoir capacitor or to a rechargeable battery. Any high current pulse loads must be fed by the reservoir capacitor on this pin. VOUT2 (Pin 4/ Pin 6): Switched Output of the Converter. Connect this pin to a switched load. This output is open until VOUT_EN is driven high, then it is connected to VOUT through a 1Ω PMOS switch. If not used, this pin should be left open or tied to VOUT. VOUT2_EN (Pin 5/Pin 7): Enable Input for VOUT2. VOUT2 will be enabled when this pin is driven high. There is an internal 5M pull-down resistor on this pin. If not used, this pin can be left open or grounded. PGOOD (Pin 6/Pin 8): Power Good Output. When VOUT is within 7.5% of its programmed value, this pin will be pulled up to the LDO voltage through a 1M resistor. If VOUT drops 9% below its programmed value PGOOD will go low. This pin can sink up to 100μA. VLDO (Pin 7/Pin 9): Output of the 2.2V LDO. Connect a 2.2μF or larger ceramic capacitor from this pin to GND. If not used, this pin should be tied to VAUX. GND (Pins 8, 11, 16, Exposed Pad Pin 21/Pins 10, 13, 18): Ground Pins. Connect these pins directly to the ground plane. The exposed pad serves as a ground connection and as a means of conducting heat away from the die. VS2 (Pin 20/Pin 2): VOUT Select Pin 2. Connect this pin to ground or VAUX to program the output voltage (see Table 1). VS1 (Pin 19/Pin 1): VOUT Select Pin 1. Connect this pin to ground or VAUX to program the output voltage (see Table 1). Table 1. Regulated Output Voltage Using Pins VS1 and VS2 VS2 VS1 VOUT GND GND 2.35V GND VAUX 3.3V VAUX GND 4.1V VAUX VAUX 5.0V TYPICAL PERFORMANCE CHARACTERISTICS T A = 25°C, unless otherwise noted. VLDO 20mV/DIV ILDO 5mA/DIV 200μs/DIV 3109 G15 0mA TO 3mA LOAD STEP CLDO = 2.2μF 1ms/DIV 3109 G16 CH2 VOUT2 1V/DIV CH1 VOUT2_EN 1V/DIV 10mA LOAD ON VOUT2 COUT = 220μF 5SEC/DIV 3109 G17 CH2, VOUT 1V/DIV CH1, VIN 50mV/DIV CH3 VSTORE 1V/DIV CH4, VLDO 1V/DIV CSTORE = 470μF VOUT LOAD = 100μA |
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