DATASHEET
Radiation Hardened and SEE Hardened 3V to 13.2V, 6A
Buck Regulator
ISL70003SEH
Features
The ISL70003SEH is a radiation and SEE hardened
synchronous buck regulator capable of operating over an
input voltage range of 3.0V to 13.2V. With integrated
MOSFETs, this highly efficient single chip power solution
provides a tightly regulated output voltage that is externally
adjustable from 0.6V to ~90% of the input voltage.
Continuous output load current capability is 6A for
T ≤+125°C and 3A for T ≤ +150°C.
• Acceptance tested to 50krad(Si) (LDR) wafer-by-wafer
• ±1% reference voltage over line, temperature and radiation
• Integrated MOSFETs 31mΩPFET/21mΩ NFET
- 95% peak efficiency
• Externally adjustable loop compensation
• Supports DDR applications (V tracks V
/2)
voltage
TT DDQ
J
J
- Buffer amplifier for generating V
- 3A current sinking capability
REF
The ISL70003SEH uses voltage mode control architecture
with feed-forward and switches at a selectable frequency of
500kHz or 300kHz. Loop compensation is externally
adjustable to allow for an optimum balance between stability
and output dynamic performance. The internal synchronous
power switches are optimized for high efficiency and
excellent thermal performance.
• Grounded lid eliminates charge build up
• IMON pin for output current monitoring
• Adjustable analog soft-start
• Diode emulation for increased efficiency at light loads
• 500kHz or 300kHz operating frequency synch wording
• Monotonic start-up into prebiased load
• Full military temperature range operation
The chip features two logic-level disable inputs that can be
used to inhibit pulses on the phase (LXx) pins in order to
maximize efficiency based on the load current. The
ISL70003SEH also supports DDR applications and contains a
buffer amplifier for generating the V
voltage.
REF
- T = -55°C to +125°C
A
High integration, best in class radiation performance and a
feature filled design make the ISL70003SEH an ideal choice
to power many of todays small form factor applications.
- T = -55°C to +150°C
J
• Radiation tolerance
- High dose rate (50-300rad(Si)/s). . . . . . . . . . . 100krad(Si)
Applications
• FPGA, CPLD, DSP, CPU core and I/O supply voltages
- Low dose rate (0.01rad(Si)/s) . . . . . . . . . . . . 100krad(Si)*
* Limit established by characterization.
• DDR memory supply voltages
• SEE hardness
2
- SEB and SEL LET . . . . . . . . . . . . . . . . 86.4MeV•cm /mg
TH
- SET at LET 86.4MeV•cm /mg . . . . . . . . . . . < ±3% ΔV
• Low-voltage, high-density distributed power systems
2
OUT
Related Literature
• AN1897, ISL70003SEHEV1Z Evaluation Board
2
- SEFI LET . . . . . . . . . . . . . . . . . . . . . . . . . 60MeV•cm /mg
TH
• Electrically screened to DLA SMD 5962-14203
• AN1915, ISL70003SEH iSim:PE Model
• AN1913, Single Event Effects Testing of the ISL70003SEH,
3V to 13.2V, 6A Synchronous Buck Regulator
• AN1924, Total Dose Testing of the ISL70003SEH Radiation
Hardened Point Of Load Regulator
100
95
90
85
9V
80
75
70
5V
2.5V
65
3.3V
60
55
50
0
1
2
3
4
5
6
LOAD CURRENT (A)
FIGURE 1. POWER DISTRIBUTION SOLUTION FOR RAD HARD LOW
POWER FPGA’s
FIGURE 2. EFFICIENCY vs LOAD, V = 12V, f
IN
= 300kHz
SW
ALL OUTPUTS ACTIVE
May 12, 2016
FN8604.5
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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