RENESAS ISL78214ARZ-T

The ISL78214 is a highly efficient monolithic synchronous buck DC/DC converter capable of delivering up to 4A of continuous output current from a 2.8V to 5.5V input supply. It uses a current-mode control architecture to achieve very low duty cycle operation at high frequencies, offering fast transient response and excellent loop stability. The converter integrates a pair of low on-resistance P-channel and N-channel internal MOSFETs to maximize efficiency and minimize external component count. 100% duty cycle operation allows less than 400mV of dropout at 4A output current. The PWM switching frequency of up to 1MHz can be synchronized to an external clock up to 4MHz, allowing small external components to be used, and the SYNC input enables multiple ICs to be synchronized out of phase to reduce ripple and eliminate beat frequency. The ISL78214 is configurable for discontinuous or forced continuous operation at light loads. Forced continuous operation reduces noise and RFI, while discontinuous mode provides high efficiency by reducing switching losses at light loads. Fault protection is provided by an internal hiccup-mode current limit, output overvoltage comparator, and over-temperature monitoring circuit. A power good output voltage monitor indicates when the output is in regulation. The ISL78214 is offered in a space-saving 4x4 QFN lead-free package with an exposed pad leadframe for low thermal resistance. It provides a 1ms power good (PG) timer at startup. During shutdown, the ISL78214 discharges the output capacitor. Additional features include internal soft-start, internal compensation, overcurrent protection, and thermal shutdown. The ISL78214 is available in a 16-pin 4mm×4mm QFN package with a maximum height of 1mm. The total converter footprint is less than 0.4 square inches. The ISL78214 is AEC-Q100 qualified for the automotive temperature range of -40°C to +105°C.

• High-efficiency synchronous buck regulator, up to 97% efficiency
• Power Good (PG) output with 1ms delay
• 2.8V to 5.5V supply voltage
• 2% output accuracy over temperature/load/line variations
• 4A output current
• Pin-compatible with ISL78213
• Startup with pre-biased output
• Internal soft-start — 1ms
• Soft-stop output discharge when disabled
• 35µA quiescent supply current in PFM mode
• Selectable forced PWM mode and PFM mode
• External synchronization up to 4MHz
• Logic-controlled shutdown current less than 1µA
• 100% maximum duty cycle
• Internal current-mode compensation
• Peak current limiting and hiccup-mode short-circuit protection
• Over-temperature protection
• Small 16-pin 4mm×4mm QFN package
• Lead-free (RoHS compliant)
• AEC-Q100 compliant

• Automotive Power Supply
• DC/DC Point-of-Load Modules
• MCU/MPU, FPGA, and DSP Power Supply