ISL70002SEH

Radiation Hardened and SEE Hardened 12A Synchronous Buck Regulator with Current Sharing

Product Status: Mass Production

OVERVIEW

The ISL70002SEH 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 capability is primarily determined by PVIN voltage with up to 22A for a single IC at PVIN ≤ 5.5V for TJ ≤ +125°C. Two ISL70002SEH devices, configured to current share, can provide up to 38A of total output current at PVIN ≤ 5.5V for TJ ≤ +125°C assuming ±27% worst-case current share accuracy.

The ISL70002SEH uses peak current-mode control with integrated error amp compensation and pin-selectable slope compensation. Switching frequency is also pin selectable to either 1MHz or 500kHz. Two devices can be synchronized 180° out-of-phase to reduce input RMS ripple current.

High integration makes the ISL70002SEH an ideal choice to power 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

    • DLA SMD 5962-12202
    • Maximum output current for a single device: Up to 22A
    • Maximum output current for two current sharing devices based on 27% worst case current share mismatch: Up to 38A
    • Available in a thermally enhanced heat spreader package (R64.C)
    • 1MHz or 500kHz switching frequency
    • 3V to 5.5V supply voltage range
    • ±1% reference voltage (line, load, temperature, and rad)
    • Redundancy/junction isolation: exceptional SET performance
    • Excellent transient response
    • High efficiency >90%
    • Two ISL70002SEH synchronization, inverted-phase
    • Comparator input for enable and power-good
    • Input undervoltage, output undervoltage, and adjustable output overcurrent protection
    • QML qualified per MIL-PRF-38535
    • Full military temperature range operation (-55°C to +125°C)
    • Radiation environment
      • High dose 100krad(Si)
      • ELDRS 100krad(Si)*
        *Level assured by characterization; “EH” version is production tested to 50krad(Si).
    • SEE hardness
      • SEL and SEB LETTH 86.4MeV/mg/cm2
      • SEFI LETTH 43MeV/mg/cm2
      • SET LETTH 86.4MeV/mg/cm2

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL70002SEH
Basic Information
Production Status
Mass Production
# 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]
12
Switching Freq. (max) (MHz)
1
Switching Freq. (min) (MHz)
0.5
Max Duty Cycle (%)
90
Peak Efficiency (%)
92
POR
Yes
SYNCH Capability
Yes
Control Type
Current Mode
Switching Frequency Range (MHz)
0.5, 1.0
Class
V, /PROTO
DLA SMD
5962-12202
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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