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LTC3448 Datasheet(PDF) 6 Page - Linear Technology |
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LTC3448 Datasheet(HTML) 6 Page - Linear Technology |
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6 / 20 page  6 LTC3448 3448f TYPICAL PERFOR A CE CHARACTERISTICS (From Figure 1a Except for the Resistive Divider Resistor Values) Load Step External Mode Control (Constant 1mA Load) PI FU CTIO S VFB (Pin 1): Feedback Pin. This pin receives the feedback voltage from an external resistive divider across the output. VOUT (Pin 2): Output Pin. This pin connects to an external resistor divider and the linear regulator output. Connect externally to the inductor and the output capacitor. The internal linear regulator will supply current up to the ILDO(OFF) current. Load currents above that are supplied by the buck regulator. Internal circuitry automatically enables the buck switching regulator at load currents higher than the ILDO(OFF). The minimum required capacitance on this pin is 2 µF. MODE (Pin 3): Linear Regulator Control. Grounding this pin turns off the linear regulator. Setting this pin to VIN turns on the linear regulator regardless of the load current. Tying this pin midrange (i.e., to VOUT) will place the linear regulator in auto mode, where turn on/off is a function of the load current. In applications where MODE is externally driven high or low, this pin should be held low for 50 µs after the RUN pin is pulled high. VIN (Pin 4): Main Supply Pin. This pin must be closely decoupled to GND with a 2.2 µF or greater ceramic capacitor. SW (Pin 5): Switch Node Connection to Inductor. This pin connects to the drains of the internal main and synchro- nous power MOSFET switches. FREQ (Pin 6): Frequency Select. Switching frequency is set to 1.5MHz when FREQ = 0V and to 2.25MHz when FREQ = VIN. Do not float this pin. SYNC (Pin 7): External Synchronization Pin. The oscilla- tion frequency can be synchronized to an external oscilla- tor applied to this pin. For external frequencies above 2.2MHz, pull FREQ high. RUN (Pin 8): Run Control Input. Forcing this pin above 1.5V enables the part. Forcing this pin below 0.3V shuts down the device. In shutdown, all functions are disabled drawing <1 µA supply current. Do not leave RUN floating. Exposed Pad (Pin 9): Ground. This pin must be soldered to PCB. VOUT 100mV/DIV AC COUPLED IL 500mA/DIV ILOAD 250mA/DIV VIN = 3.6V VOUT = 1.5V ILOAD = 100mA TO 600mA 10 µs/DIV 3448 G18 VOUT 20mV/DIV AC COUPLED MODE PIN 2V/DIV VOUT = 1.5V TA = 25°C 200 µs/DIV 3448 G19 SWITCHER SWITCHER LDO |
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