The IS-1845ASRH, IS-1845ASEH are designed to be used in switching power supplies operating in currentmode. The rising edge of the on-chip oscillator turns on the output. Turn-off is controlled by the current sense comparator and occurs when the sensed current reaches a peak controlled by the error amplifier.
Constructed with Intersil’s Rad Hard Silicon Gate (RSG) dielectrically isolated BiCMOS process, these devices are immune to single event latch-up and have been specifically designed to provide a high level of immunity to single event transients. All specified parameters are guaranteed and tested for 300krad(Si) total dose performance at a high dose rate and 50krad(Si) total dose at a low dose rate.
Detailed Electrical Specifications for these devices are contained in the SMD 5962-01509. A “hot-link” is also provided on our website for downloading the SMD.

Features
• Electrically Screened to DSCC SMD # 5962-01509
• QML Qualified per MIL-PRF-38535 Requirements
• Radiation Environment
   - High Dose Rate. . . . . . . . . . . . . . . . . . . . .300 krad(SI) (Max)
   - Low Dose Rate . . . . . . . . . . . . . . . . . . . . . .50 krad(SI) (Max)
   - SEL Immune . . . . . . . . . . . . . . . . . . . . Dielectrically Isolated
   - SEU Immune. . . . . . . . . . . . . . . . . . . . . . . . 35MeV/mg/cm2
   - SEU Cross-Section at 89MeV/mg/cm2. . . . . . 5 x 10-6cm2
• Low Start-up Current . . . . . . . . . . . . . . . . . . . . . . . 100µA (Typ)
• Fast Propagation Delay . . . . . . . . . . . . . . . . . . . . . . . 80ns (Typ)
• Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . . . 12V to 20V
• High Output Drive. . . . . . . . . . . . . . . . . . . . . . . . 1A (Peak, Typ)
• Undervoltage Lockout . . . . . 8.8V Start (Typ), 8.2V Stop (Typ)

Applications
• Current-Mode Switching Power Supplies
• Control of High Current FET Drivers
• Motor Speed and Direction Control

Package 8 LD CDIP2-T8 SBDIP
Package 18 LD FLATPACK