IS-1845ASRH
S IGN S
EW DE
FOR N
RT
ENDED ACEMENT PA
OMM
C
Data Sheet
REPL
NOT RE
ENDED
H
M
XAR
RECOM
ISL7884
September 25, 2008
FN9001.4
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.
TM
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
- SEU Immune . . . . . . . . . . . . . . . . . . . . 35MeV/mg/cm
2
- SEU Cross-Section at 89MeV/mg/cm
2
. . . . 5 x 10
-6
cm
2
• 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)
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.
Applications
• Current-Mode Switching Power Supplies
• Control of High Current FET Drivers
• Motor Speed and Direction Control
Pinouts
IS7-1845ASRH
(8 LD CDIP2-T8 SBDIP)
TOP VIEW
COMP
VFB
ISENSE
RTCT
1
2
3
4
8
7
6
5
VREF
VCC
OUT
GND
NC
COMP
VFB
NC
NC
NC
ISENSE
RTCT
NC
IS9-1845ASRH
(18 LD FLATPACK)
TOP VIEW
1
2
3
4
5
6
7
8
9
18
17
16
15
14
13
12
11
10
NC
VREF
VCC
VC
OUT
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 C
t
= 3.3nF and R
t
= 10k timing components only.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
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