1

®

FN9001.3

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143

Copyright © Intersil Americas Inc. 2003. All Rights Reserved.

All other trademarks mentioned are the property of their respective owners.

IS-1845ASRH

Single Event Radiation Hardened

High Speed, Current Mode PWM

The IS-1845ASRH is designed to be

used in switching power supplies

operating in current-mode. 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.

Detailed Electrical Specifications for these devices are

contained in SMD 5962-01509. A “hot-link” is provided on

our website for downloading the SMD.

Pinouts

IS7-1845ASRH (CDIP2-T8 SBDIP)

TOP VIEW

IS9-1845ASRH (FLATPACK)

TOP VIEW

NOTES:

1. Grounding the Comp pin does not inhibit the output. The output

may be inhibited by applying >1.2V to the ISENSE pin.

2. This part should be operated with CT=3.3nF and RT=10k timing

components only.

Features

• Electrically Screened to DSCC SMD # 5962-01509

• QML Qualified per MIL-PRF-38535 Requirements

• Radiation Environment

- Total Dose . . . . . . . . . . . . . . . . . . . . 300 krad(SI) (Max)

- SEL Immune. . . . . . . . . . . . . . . . . Dielectrically Isolated

• Low Start-up Current . . . . . . . . . . . . . . . . . . . 100

µA (Typ)

• Fast Propagation Delay . . . . . . . . . . . . . . . . . . 80ns (Typ)

• Supply Voltage Range . . . . . . . . . . . . . . . . . . . 12V to 20V

• High Output Drive. . . . . . . . . . . . . . . . . . . . 1A (Peak, Typ)

• Under Voltage 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

TM

COMP

VFB

ISENSE

RTCT

1

2

3

4

8

7

6

5

VREF

VCC

OUT

GND

COMP

VFB

NC

NC

NC

ISENSE

RTCT

NC

3

4

5

6

7

8

9

217

16

15

14

13

12

11

10

VREF

VCC

VC

OUT

NC

GND

OSCGND

NC

NC

1

18

NC

Ordering Information

ORDERING NUMBER

INTERNAL

MKT. NUMBER

TEMP. RANGE

5962F0150901VPC

IS7-1845ASRH-Q

-50 to 125

5962F0150901QPC

IS7-1845ASRH-8

-50 to 125

5962F0150901VXC

IS9-1845ASRH-Q

-50 to 125

5962F0150901QXC

IS9-1845ASRH-8

-50 to 125

IS7-1845ASRH/Proto

IS1-1845ASRH/Proto

-50 to 125

IS9-1845ASRH/Proto

IS9-1845ASRH/Proto

-50 to 125

Data Sheet

October 2003