Radiation Hardened and SEE Hardened 6A
Synchronous Buck Regulator with Integrated MOSFETs
ISL70001SRH
The ISL70001SRH is a radiation hardened and SEE hardened
high efficiency monolithic synchronous buck regulator with
integrated MOSFETs. This single chip power solution operates
over an input voltage range of 3V to 5.5V and provides a tightly
regulated output voltage that is externally adjustable from 0.8V
to ~85% of the input voltage. Output load current capacity is 6A
for T
J
< +145°C
.
The ISL70001SRH utilizes peak current-mode control with
integrated compensation and switches at a fixed frequency of
1MHz. Two ISL70001SRH devices can be synchronized 180°
out-of-phase to reduce input RMS ripple current. These attributes
reduce the number and size of external components required,
while providing excellent output transient response. The
internal synchronous power switches are optimized for high
efficiency and good thermal performance.
The chip features a comparator type enable input that provides
flexibility. It can be used for simple digital on/off control or,
alternately, can provide undervoltage lockout capability by
using two external resistors to precisely sense the level of an
external supply voltage. A power-good signal indicates when the
output voltage is within ±11% typical of the nominal output
voltage.
Regulator start-up is controlled by an analog soft-start circuit,
which can be adjusted from approximately 2ms to 200ms by
using an external capacitor.
The ISL70001SRH incorporates fault protection for the
regulator. The protection circuits include input undervoltage,
output undervoltage, and output overcurrent.
High integration makes the ISL70001SRH an ideal choice to
power many of today’s small form factor applications. Two
devices can be synchronized to provide a complete power
solution for large scale digital ICs, like field programmable gate
arrays (FPGAs), that require separate core and I/O voltages.
Specifications for Rad Hard QML devices are controlled by the
Defense Supply Center in Columbus (DSCC). The SMD numbers
listed in the Ordering Information table on page 2 must be used
when ordering.
This link is also available on the
on the Intersil web site.
Features
• Electrically Screened to DSCC SMD 5962-09225
• QML Qualified per MIL-PRF-38535 Requirements
• Full Mil-Temp Range Operation (T
A
= -55°C to +125°C)
• Radiation Hardness
- Total Dose [50-300rad(Si)/s] . . . . . . . . . . .100krad(Si) min
• SEE Hardness
- SEL and SEB LET
eff
. . . . . . . . . . . . 86.4MeV/mg/cm
2
min
- SEFI X-section (LET
eff
= 86.4MeV/mg/cm
2
) 1.4 x 10
-6
cm
2
max
- SET LET
eff
(< 1 Pulse Perturbation) 86.4MeV/mg/cm
2
min
• High Efficiency > 90%
• Fixed 1MHz Operating Frequency
• Operates from 3V to 5.5V Supply
• ±1% Reference Voltage over Line, Load, Temperature and
Radiation
• Adjustable Output Voltage
- Two External Resistors Set V
OUT
from 0.8V to ~85% of V
IN
• Excellent Dynamic Response
• Bi-directional SYNC Pin Allows Two Devices to be Synchronized
180
°
Out-of-Phase
• Device Enable with Comparator Type Input
• Power-Good Output Voltage Monitor
• Adjustable Analog Soft-Start
• Input Undervoltage, Output Undervoltage and Output
Overcurrent Protection
• Starts Into Pre-Biased Load
Applications
• FPGA, CPLD, DSP, CPU Core or I/O Voltages
• Low-Voltage, High-Density Distributed Power Systems
May 23, 2011
FN6947.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
|
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