• Electrically Screened to DSCC SMD 5962-09225
• QML Qualified per MIL-PRF-38535 Requirements
• Full Mil-Temp Range Operation (T_A = -55°C to +125°C)
• Radiation Hardness
  • Total Dose [50-300rad(Si)/s]: 100krad(Si) min
• SEE Hardness
  • SEL and SEB LETeff: 86.4MeV/mg/cm² min
  • SEFI X-section (LET_eff = 86.4MeV/mg/cm²) 1.4 x 10^-6 cm² max
  • SET LET_eff (< 1 Pulse Perturbation) 86.4MeV/mg/cm² min
• High Efficiency > 90%
• Fixed 1MHz Operating Frequency
• Operates from 3V to 5.5V Supply
• ±1% Reference Voltage over Line, Load, Temperature and Radiation
• Adjustable Output Voltage
  • Two External Resistors Set V_OUT from 0.8V to ~85% of V_IN
• Excellent Dynamic Response
• Bi-directional SYNC Pin Allows Two Devices to be Synchronized 180° Out-of-Phase
• Device Enable with Comparator Type Input
• Power-Good Output Voltage Monitor
• Adjustable Analog Soft-Start
• Input Undervoltage, Output Undervoltage and Output Overcurrent Protection
• Starts Into Pre-Biased Load

The ISL70001SRH is a radiation hardened and SEE hardened high efficiency monolithic synchronous buck regulator with integrated MOSFETs. This single chip power solution operates over an input voltage range of 3V to 5.5V and provides a tightly regulated output voltage that is externally adjustable from 0.8V to ~85% of the input voltage. Output load current capacity is 6A for T_J < +145°C.

The ISL70001SRH utilizes peak current-mode control with integrated compensation and switches at a fixed frequency of 1MHz. Two ISL70001SRH devices can be synchronized 180° out-of-phase to reduce input RMS ripple current. These attributes reduce the number and size of external components required, while providing excellent output transient response. The internal synchronous power switches are optimized for high efficiency and good thermal performance.

The chip features a comparator type enable input that provides flexibility. It can be used for simple digital on/off control or, alternately, can provide undervoltage lockout capability by precisely sensing the level of an external supply voltage using two external resistors. A power-good signal indicates when the output voltage is within ±11% typical of the nominal output voltage.

Regulator start-up is controlled by an analog soft-start circuit, which can be adjusted from approximately 2ms to 200ms using an external capacitor.

The ISL70001SRH incorporates fault protection for the regulator. The protection circuits include input undervoltage, output undervoltage and output overcurrent.

High integration makes the ISL70001SRH an ideal choice to power many of todays small form factor applications. Two devices can be synchronized to provide a complete power solution for large scale digital ICs, like field programmable gate arrays (FPGAs), that require separate core and I/O voltages.

Specifications for Rad Hard QML devices are controlled by the Defense Supply Center in Columbus (DSCC). The SMD numbers listed in the Ordering Information Table on page 2 must be used when ordering.

Detailed Electrical Specifications for these devices are contained in SMD 5962-09225. A link is provided on our website for downloading.

• FPGA, CPLD, DSP, CPU Core or I/O Voltages
• Low-Voltage, High-Density Distributed Power Systems