LTC3026 Using a Single Boost Converter to Drive Multiple Linear Regulators
The LTC3026 is a very low dropout (VLDO™) linear regulator that can operate at input voltages down to 1.14V. The device is capable of supplying 1.5A of output current with a typical dropout voltage of only 100mV. To allow operation at low input voltages the LTC3026 includes a boost converter that provides the necessary headroom for the internal LDO circuitry.
The boosted output voltage of one LTC3026 can supply the boost voltage for other LTC3026s, thus requiring a single inductor for multiple LDOs. A single LTC3026 boost converter can be used to drive multiple bootstrapped LTC3026s with the internal boost converters disabled. Thus a single inductor can be used to power two (or possibly more) functioning LTC3026s. In cases where all LTC3026s have the same input supply (IN) the internal boost converters of the bootstrapped LTC3026s can be disabled by floating the SW pin. If the LTC3026s are not all connected to the same input supply then the internal boost converters of the bootstrapped LTC3026s are disabled by floating the SW pin.
A user supplied boost voltage can be used eliminating the need for an inductor altogether.
Software
LTspice
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