Texas Instruments LM5165 | Demoboard LM5165EVM-HD-C50X EVM

Description

The LM5165EVM-HD-C50X high density EVM is designed to use a regulated or non-regulated highvoltageinput rail ranging from 3 V to 65 V to produce a tightly regulated output voltage of 5 V at loadcurrents up to 150 mA. The wide input voltage range (“wide VIN”) DC/DC solution offers outsized voltagerating and operating margin to deal with supply rail transient voltages. The output voltage is fixed at 5Vusing the LM5165's integrated high-resistance feedback divider to reduce circuit footprint, improve noiseimmunity, and achieve a lower no-load supply current. The power train passive components selected forthis EVM, including filter inductor and ceramic input and output capacitors, are available with AEC-Q200qualification for automotive applications.

Features

Tightly-regulated output voltage of 5 V with 2% setpoint accuracy

• Wide input voltage operating range of 3 V to 65 V
• Full load current of 150 mA
• Ultra-high power conversion efficiency across wide load current range– Full load efficiency of 91% and 88.5% at VIN = 12 V and 24 V, respectively– Greater than 85% efficiency at load currents above 1 mA, VIN = 12 V
• 12-μA no-load supply current at VIN = 24 V
• Constant on-time (COT) control architecture provides fast load transient response– Low component count – no loop compensation components– Almost-constant switching frequency set by resistor– Natural, automatic duty cycle extension to 100% to maintain regulation in low-dropout applications
• Integrated high-side and low-side power MOSFETs– 2-Ω PMOS buck switch supports 100% duty cycle for low dropout voltage– 1-Ω NMOS synchronous rectifier eliminates external Schottky diode
• Peak inductor current limit set to 240 mA (ILIM pin tied to GND)
• Monotonic pre-bias output voltage startup
• User-adjustable soft-start ramp time set to 6 ms by 47-nF capacitor at the SS pin– Option for internal 0.9-ms soft-start time by leaving SS open circuit– Option for no soft-start for fast startup capability using 100-kΩ resistor connected from SS to GND
• ENABLE and PGOOD terminals with 10-MΩ and 10-kΩ pullups to VIN and VOUT, respectively
• Resistor-programmable input UVLO with customizable hysteresis for applications with wide turn-on /turn-off voltage difference– Input UVLO internally set to turn on and off at 2.75 V and 2.45 V, respectively
• Input circuit shunt RC damping accommodates high-Q inductive supply lines
• Fully assembled, tested and proven PCB layout with 15-mm x 12-mm total footprint

Typical applications

• General-purpose bias supplies
• Process control
• Building automation and HVAC systems
• High voltage LDO replacement
• 2-/3-/4-wire sensor power
• Automotive and battery powered equipment

More information

• Datasheet
• IC product information