www.DataSheet4U.com
19-0659; Rev 0; 10/06
KIT ATION EVALU E L B AVAILA
4V to 72V Input LDOs with Boost Preregulator
G...
www.DataSheet4U.com
19-0659; Rev 0; 10/06
KIT ATION EVALU E L B AVAILA
4V to 72V Input LDOs with Boost Pre
regulator
General Description
The MAX5092A/MAX5092B/MAX5093A/MAX5093B lowquiescent-current, low-dropout (LDO)
regulators contain simple boost pre
regulators operating at a high frequency. The devices seamlessly provide a preset 3.3V (MAX5092A/MAX5093A) or 5V (MAX5092B/MAX5093B) LDO output voltage from an automotive cold-crank through load-dump (3.5V to 80V) input voltage conditions. The MAX5092_/MAX5093_ deliver up to 250mA with excellent load and line regulation. During normal operation, when the battery is healthy, the boost pre
regulator is completely turned off, reducing quiescent current to 65µA (typ). This makes the devices suitable for always-on power supplies. The buck-boost operation achieved by this combination of LDO and boost pre
regulator offers the advantage of using a single off-the-shelf inductor in place of the multiple-winding custom magnetics needed in typical single-ended primary inductor converter (SEPIC) and transformer-based flyback topologies. The high operating frequency of the boost
regulator significantly reduces component size. The MAX5092_ integrates a blocking diode to further reduce the external component count. The boost pre
regulator output voltage is preset to 7V. Both LDO and boost output voltages are programmable using external resistors. The boost pre
regulator output voltage is adjustable up to 11V (MAX5092_), or up to 12V (MAX5093_). T...