IS-1845ASRH
®
Data Sheet
October 2003
FN9001.3
Single Event Radiation Hardened
High Speed, Current Mode PWM
Features
• Electrically Screened to DSCC SMD # 5962-01509
• QML Qualified per MIL-PRF-38535 Requirements
The IS-1845ASRH is designed to be
used in switching power supplies
operating in current-mode. The
rising edge of the on-chip oscillator
TM
• Radiation Environment
- Total Dose . . . . . . . . . . . . . . . . . . . . 300 krad(SI) (Max)
- SEL Immune. . . . . . . . . . . . . . . . . Dielectrically Isolated
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.
2
- SEU Immune . . . . . . . . . . . . . . . . . . . . 35MeV/mg/cm
2
-6
2
- SEU Cross-Section at 89MeV/mg/cm . . . . 5 x 10 cm
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.
• Low Start-up Current . . . . . . . . . . . . . . . . . . . 100µA (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)
Detailed Electrical Specifications for these devices are
contained in SMD 5962-01509. A “hot-link” is provided on
our website for downloading the SMD.
Applications
• Current-Mode Switching Power Supplies
• Control of High Current FET Drivers
• Motor Speed and Direction Control
Pinouts
IS7-1845ASRH (CDIP2-T8 SBDIP)
TOP VIEW
Ordering Information
COMP
VFB
1
2
3
4
8
7
6
5
VREF
VCC
OUT
GND
INTERNAL
TEMP. RANGE
o
ORDERING NUMBER
5962F0150901VPC
5962F0150901QPC
5962F0150901VXC
5962F0150901QXC
IS7-1845ASRH/Proto
IS9-1845ASRH/Proto
MKT. NUMBER
( C)
ISENSE
RTCT
IS7-1845ASRH-Q
IS7-1845ASRH-8
IS9-1845ASRH-Q
IS9-1845ASRH-8
IS1-1845ASRH/Proto
IS9-1845ASRH/Proto
-50 to 125
-50 to 125
-50 to 125
-50 to 125
-50 to 125
-50 to 125
IS9-1845ASRH (FLATPACK)
TOP VIEW
NC
COMP
VFB
1
2
3
4
5
6
7
8
9
NC
18
17
VREF
VCC
VC
16
15
14
13
12
11
10
NC
NC
OUT
NC
NC
ISENSE
RTCT
NC
GND
OSCGND
NC
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.
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1
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