Power Management ICs - PMIC

The LT®3741 and LT3741-1 are fixed frequency synchronous step-down DC/DC controllers designed to accurately regulate the output current at up to 20A. The average currentmode controller will maintain inductor current regulation over a wide output voltage range of 0V to (VIN – 2V). The regulated current is set by an analog voltage on the CTRL pins and an external sense resistor. Due to its unique topology, the LT3741 is capable of sourcing and sinking current. If sinking current is not required, or for parallel applications, use the LT3741-1.

The regulated voltage and overvoltage protection are set with a voltage divider from the output to the FB pin. Soft-Start is provided to allow a gradual increase in the regulated current during startup. The switching frequency is programmable from 200kHz to 1MHz through an external resistor on the RT pin or through the use of the SYNC pin and an external clock signal.

The LTC®4151 is a high side power monitor that operates over a wide voltage range of 7V to 80V. In default operation mode, the onboard 12-bit ADC continuously measures high side current, input voltage and an external voltage. Data is reported through the I2C interface when polled by a host. The LTC4151 can also perform on-demand measurement in a snapshot mode.

The LTC4151 features a dedicated shutdown pin to reduce power consumption. The LTC4151-1/LTC4151-2 feature split I2C data pins to drive opto-isolators. The data out on the LTC4151-1 is inverted while that on the LTC4151-2 is not.

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 LT®6654 is a family of small precision voltage references that offers high accuracy, low noise, low drift, low dropout and low power. The LT6654 operates from voltages up to 36V and is fully specified from –55°C to 125°C. A buffered output ensures ±10mA of output drive with low output impedance and precise load regulation. These features, in combination, make the

LT6654 ideal for portable equipment, industrial sensing and control, and automotive applications. The LT6654 was designed with advanced manufacturing techniques and curvature compensation to provide 10ppm/°C temperature drift and 0.05% initial accuracy. Low thermal hysteresis ensures high accuracy and 1.6ppmP-P noise minimizes measurement uncertainty. Since the LT6654 can also sink current, it can operate as a low power negative voltage reference with the same precision as a positive reference.

The LT6654 references are offered in 6-lead SOT-23 package and an 8-lead LS8 package. The LS8 is a 5mm × 5mm surface mount hermetic package that provides outstanding stability.

The LTC®4357 is a positive high voltage ideal diode controller that drives an external N-channel MOSFET to replace a Schottky diode. When used in diode OR and high current diode applications, the LTC4357 reduces power consumption, heat dissipation, voltage loss and PC board area. The LTC4357 easily ORs power sources to increase total system reliability.

In diode-OR applications, the LTC4357 controls the forward voltage drop across the MOSFET to ensure smooth current transfer from one path to the other without oscillation. If the power source fails or is shorted, a fast turn-off minimizes reverse current transients.

The SM-LP-5001E is a line matching Audio Transformer, 1:1 turn ratio, 600Ω primary/secondary impedance with Sn/Ag/Cu terminal plating and surface mount. This transformer features subminiature in SMT, distortion of 0.015%, vacuum encapsulated. Suitable for modems (V32).

• 7.36mm Seated height
• 24dB at 200 to 4kHz Return loss
• 115Ω ±15% Primary/Secondary DC resistance
• -20 to 85°C Operating temperature range

The EL7202CSZ is a high speed matched dual-channel Power MOSFET Driver improves the operation of the industry standard DS0026 clock driver. The Elantec versions are very high speed drivers capable of delivering peak currents of 2A into highly capacitive loads. The high speed performance is achieved by means of a proprietary Turbo-Driver circuit that speeds up input stages by tapping the wider voltage swing at the output. Improved speed and drive capability are enhanced by matched rise and fall delay times. These matched delays maintain the integrity of input-to-output pulse-widths to reduce timing errors and clock skew problems. This improved performance is accompanied by a 10 fold reduction in supply currents over bipolar drivers, yet without the delay time problems commonly associated with CMOS devices. Dynamic switching losses are minimized with non-overlapped drive techniques.

• Industry standard driver replacement
• Improved response times
• Matched rise and fall times
• Reduced clock skew
• Low output impedance
• Low input capacitance
• High noise immunity
• Improved clocking rate
• Low supply current
• Wide operating range

The DSEI2X121-02A is a dual isolated fast recovery Epitaxial Diode features planar passivated chips, very short recovery time, extremely low switching losses and soft recovery behaviour.

• 250W Total power dissipation
• 2500V Isolation voltage

Audio Transformers / Signal Transformers 100Base-TX SMD PoE 350uH .75Ohms 1-Port

The L5973D013TR is a step-down monolithic power Switching Regulator with a minimum switch current limit of 2.5A so it is able to deliver more than 2A DC current to the load depending on the application conditions. The output voltage can be set from 1.235 to 35V. The device uses an internal P-channel D-MOS transistor (with a typical Rdson of 250mR) as switching element to minimize the size of the external components. An internal oscillator fixes the switching frequency at 250kHz. Having a minimum input voltage of 4V only, it is particularly suitable for 5V bus. Pulse by pulse current limit with the internal frequency modulation offers an effective constant current short-circuit protection.

• Inhibit for zero current consumption
• Internal current limiting
• Protection against feedback disconnection
• Synchronization
• Thermal shutdown
• Voltage feed-forward
• Zero load current operation
• Low dropout operation – 100% duty cycle

The L78M05CDT-TR is a three-terminal positive Voltage Regulator with several fixed output voltages, making it useful in a wide range of applications. This regulator can provide local on-card regulation, eliminating the distribution problems associated with single point regulation. Each type employs internal current limiting, thermal shutdown and safe area protection, resulting it essentially indestructible. If adequate heat sinking is provided, they can deliver over 0.5A output current. Although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltage and currents.

• Thermal Overload Protection
• Short-circuit Protection
• Output Transition SOA Protection
• 4% Output Voltage Tolerance
• Guaranteed in Extended Temperature Range

The VND600SP-E is a monolithic 2-channel high side Solid State Relay intended for driving resistive or inductive loads with one side connected to ground. Active VCC pin voltage clamp protects the device against low energy spikes. Built-in thermal shutdown and outputs current limitation protect the chip from over temperature and short circuit. Device turns-off in case of ground pin disconnections.

• Very low standby current
• CMOS compatible input
• Proportional load current sense
• Current sense disable
• Thermal shutdown protection and diagnosis
• Under voltage shutdown
• Overvoltage clamp
• Load current limitation