RHP51002

The EVAL-RHP51002-CSLZ features the RHP51002, an ultralow noise, ultrahigh power supply rejection ratio (PSRR) negative low dropout (LDO) regulator. EVAL-RHP51002-CSLZ operates over an input range of –3.8V to –20V and can deliver up to 500mA output current. It features ultralow noise (0.8μV_RMS from 10Hz to 100kHz) and very high PSRR (75dB at 1MHz).

The RHP51002 enable function (EN/UVLO pin) is bidirectional and can be controlled with either a positive or a negative voltage. The RHP51002 also offers programmable current limit functionality by connecting a resistor from ILIM to GND. Current monitoring is also achieved by sensing the I_LIM pin voltage. The V_IOC tracking function controls an upstream switching converter to maintain a constant voltage across the regulator and, hence, minimize power dissipation. The power good feedback (PGFB) pin sets a programmable power good threshold and activates the fast start-up circuitry. To use the power good function, connect an external voltage source at V_EXT. If power good and fast start-up functionality are not needed, tie PGFB to IN.

Built-in protection includes reverse battery protection, reverse current protection, internal current limit with foldback, and thermal limit with hysteresis.

For a complete description of the RHP51002, including operating details and application information, refer to the RHP51002 data sheet. The data sheet must be read in conjunction with this valuation board user guide for EVAL-RHP51002-CSLZ. The RHP51002 is assembled in a 12-lead micro small outline Package (MSOP) and 3mm × 3mm dual flat no-lead (DFN) packages with an exposed pad on the bottom side of the device. Proper board layout is essential for maximum thermal performance.