ISL70001ASEH

Radiation Hardened and SEE Hardened 6A Synchronous Buck Regulator

Product Status: Mass Production

OVERVIEW

The ISL70001ASEH 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 TJ < +145°C.

The ISL70001ASEH uses peak current-mode control for excellent output load transient response and features integrated compensation and switches at a fixed frequency of 1MHz to reduce component size and count. In application where two POLs are needed, two ISL70001ASEH devices can be synchronized 180° out-of-phase to reduce the overall input RMS ripple current. The internal synchronous power switches are optimized for high efficiency and good thermal performance

The ISL70001ASEH incorporates fault protection for the regulator. The protection circuits include input undervoltage, output undervoltage, and output overcurrent.

High integration and class leading radiation tolerance makes the ISL70001ASEH 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.

KEY FEATURES

  • ±1% reference voltage over line, load, temperature and radiation
  • Current mode control for excellent dynamic response
  • Full mil-temp range operation (TA = -55°C to +125°C)
  • 50% lower shutdown supply current than the ISL70001SEH
  • Available in a thermally enhanced heatsink package - R48.B
  • Highly efficient: 94% peak efficiency
  • Operates from 3V to 5.5V supply
  • Adjustable output voltage
    • Two external resistors set VOUT from 0.8V to ~85% of VIN
  • Bidirectional SYNC pin allows two devices to be synchronized 180° out-of-phase
  • Power-good output voltage monitor
  • Adjustable analog soft-start
  • Input undervoltage, output undervoltage and output overcurrent protection
  • Electrically screened to DLA SMD 5962-09225
  • QML qualified per MIL-PRF-38535 requirements
  • Radiation acceptance testing
    • HDR [50-300rad(Si)/s]: 100krad(Si)
    • LDR [<10mrad(Si)/s]: 50krad(Si)
  • SEE hardness (see SEE report for details)
    • SEL and SEB LETeff: 86.4MeV/mg/cm2 min
    • SEFI X-section (LETeff = 86.4MeV/mg/cm2): 1.4 x 10-6 cm2 max
    • SET LETeff (< 1 pulse perturbation): 86.4MeV/mg/cm2 min
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    APPLICATIONS

  • FPGA, CPLD, DSP, CPU Core or I/O voltages
  • Low-voltage, high-density distributed power systems

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL70001ASEH
Basic Information
Production Status
Mass Production
iSim Model
YES
# of Outputs
1
Topology [Rail 1]
Buck
Input Voltage Min (V) [Rail 1]
3
Input Voltage Max (V) [Rail 1]
5.5
Output Voltage Min (V) [Rail 1]
0.6
Output Voltage Max (V) [Rail 1]
85% x VIN
Output Current Max (A) [Rail 1]
6
Switching Freq. (max) (MHz)
1
Switching Freq. (min) (MHz)
1
Max Duty Cycle (%)
90
Peak Efficiency (%)
94
POR
Yes
SYNCH Capability
Yes
Control Type
Current Mode
Switching Frequency Range (MHz)
1 to 1
Class
V, /PROTO
DLA SMD
5962-09225
High Dose Rate (HDR) krad (Si)
100
Low Dose Rate (ELDRS) krad (Si)
100
SEL (MeV/mg/cm2)
86.4
SMD URL
Qualification Level
QML Class V (space)
Temperature Range
-55 to +125

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