ISL73847SLH中文资料Radiation Hardened Single/Dual Phase Current Mode PWM Controller数据手册Renesas规格书

描述 Description

The ISL73847SLH is a synchronous buck controller that can operate as a single or dual-phase controller. It works with the ISL71441SLH (half-bridge GaN FET driver) to generate point-of-load voltage rails for commercial space applications.

It accepts an input voltage range of 4.5V to 19V with a programmable PWM output switching frequency between 250kHz and 1.5MHz with a single resistor. The output can regulate a voltage upwards of 600mV and is limited on the top end by the minimum off time and selected switching frequency.

The wide input voltage range makes it a suitable power supply option for a high-current FPGA core and other general-purpose power solutions. The ISL73847SLH uses current mode modulation, which simplifies loop compensation and provides excellent power supply rejection. Additionally, the output is remotely sensed to compensate for any voltage drop in the load conditions. Together, these features result in a robust power supply solution that requires minimal components while achieving high current density.

The ISL73847SLH also features a tri-level output that provides excellent protection against faults by driving a mid-scale voltage to signal the power stage to enter a Hi-Z condition.

The ISL73847SLH operates across the military temperature range from -55 °C to +125 °C and is available in a 24 Ld WSOIC plastic package.

特性 Features

• Qualified to Renesas rad hard QML-P equivalent screening and QCI flow (R34TB0005EU)
• All screening and QCI is in accordance with MIL-PRF-38535L Class-P

• Wide operating voltage range:
• Input: 4.5V to 19V
• Output: 0.6V to VPWR_STAGE×((TSW-120ns)/TSW)

• Programmable PWM output switching frequency
• 250kHz to 1.5MHz

• Optional Droop regulation
• Current mode control provides
• Excellent power supply rejection
• Simplified control scheme

• Output differential remote sensing
• Programmable soft-start
• Enable control
• Power-good indicator
• TID rad hard assurance (RHA) wafer-by-wafer testing
• LDR (0.01rad(Si)/s): 75krad(Si)

• SEE characterization
• No DSEE with VDD = 25V and 86MeV•cm2/mg
• SEFI

应用 Application

• High current DC/DC Point-of-Load (POL) for FPGA and DSP supply rails
• 5V or 12V input to sub-1V output POL regulation
• Combine with ISL71441SLH GaN FET Driver for a complete DC/DC solution