1

Rad Hard and SEE Hard 6A Synchronous Buck Regulator

ISL70001ASEH

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

The ISL70001ASEH utilizes 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.

Applications

• FPGA, CPLD, DSP, CPU Core or I/O Voltages

• Low-Voltage, High-Density Distributed Power Systems

Related Literature

• ISL70001ASEHEV1Z Evaluation Board, AN1842

Features

• ±1% Reference Voltage Over Line, Load, Temperature and

Radiation

• Current Mode Control for Excellent Dynamic Response

• 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

• Bi-directional SYNC Pin Allows Two Devices to be Synchronized

• 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 Hardness

- Total Dose [50-300rad(Si)/s] . . . . . . . . . . . . . . 100krad(Si)

- Total Dose [<10mrad(Si)/s] . . . . . . . . . . . . . . 100krad(Si)*

* Product capability established by initial characterization. The

EH version is acceptance tested on a wafer-by-wafer basis to

50krad(Si) at low dose rate.

• SEE Hardness

max

FIGURE 1. TYPICAL APPLICATION

ISL70001ASEH

ISL75051SEH

ISL70001ASEH

5V Supply

CORE

AUX

I/O

RAD TOLERANT

FPGA

SYNCH

SYNCH

LOAD CURRENT (A)

70

75

80

85

90

95

0123

6

100

45

1.5V

1.2V

1.8V

2.5V

3.3V

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774

Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.

All other trademarks mentioned are the property of their respective owners.

May 22, 2013

FN8365.0