The LTC®4355 is a positive voltage ideal diode-OR controller that drives two external N-channel MOSFETs. Forming the diode-OR with N-channel MOSFETs instead of Schottky diodes reduces power consumption, heat dissipation and
PC board area. With the LTC4355, power sources can easily be ORed together to increase total system reliability. The LTC4355 can diode-OR two positive supplies or the return paths of two negative supplies, such as in a –48V system.

In the forward direction the LTC4355 controls the voltage drop across the MOSFET to ensure smooth current transfer from one path to the other without oscillation. If a power source fails or is shorted, fast turnoff minimizes
reverse current transients. Power fault detection indicates if the input supplies are not in regulation, the inline fuses are blown, or the voltages across the MOSFETs are greater than the fault threshold.

The TPS73118DBVT is a 1.8V fixed output low-dropout (LDO) Linear Regulator with reverse current protection uses a new topology, an NMOS pass element in a voltage-follower configuration. This topology is stable using output capacitors with low equivalent series resistance (ESR) and even allows operation without a capacitor. The device also provides high reverse blockage (low reverse current) and ground pin current that is nearly constant over all values of output current. The device uses an advanced BiCMOS process to yield high precision while delivering very low-dropout (LDO) voltages and low ground pin current. Current consumption, when not enabled, is less than 1µA and ideal for portable applications. The extremely low output noise is ideal for powering VCOs. These devices are protected by thermal shutdown and fold-back current limit.

• Stable with or without capacitors of all types
• Excellent load transient response-with or without optional output capacitor
• New NMOS topology provides low reverse leakage current
• 30µVrms Low noise (10kHz to 100kHz)
• 0.5% Initial accuracy
• 1% Overall accuracy over line, load and temperature
• <1µA Quiescent current (IQ) in shutdown mode
• Thermal shutdown and specified minimum and maximum current limit protection
• Green product and no Sb/Br

The LM337IMP is a three terminal adjustable negative voltage regulator in 4 pin SOT-223 package. This regulator is exceptionally easy to apply and requires only two external resistors to set output voltage and one output capacitor for frequency compensation. The circuit design has been optimized for excellent regulation and low thermal transients. The LM137 features internal current limiting, thermal shut down and safe area compensation by making them virtually blowout proof against overloads. This positive voltage regulator is used in wide variety of applications including local on-card regulation, programmable output voltage regulation or precision current regulation.

• Adjustable output voltage from -1.2V to -37V
• 1.5A output current
• Input voltage range from -4.2V to -50V
• Line regulation is typically 0.01%/V
• Load regulation is typically 0.3%
• Excellent thermal regulation of 0.002%/W
• Ripple rejection ratio of 77dB
• Output is short circuit protected
• Operating temperature range -40°C to 125°C
• 50ppm/°C temperature coefficient