RH1959

PRODUCTION

Radiation Hardened 4.5A, 500kHz Step-Down Switching Regulator

Data Sheet (Rev. A) Product Selection Table

Part Models: 3
1ku List Price: Starting From $553.47

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Overview

MIL-PRF-38535 Class V Compatible Dice*
Operates with Input as Low as 4V
Output Voltages Down to 1.21V
Constant 500kHz Switching Frequency
Synchronizable to 1MHz
Internal Slope Compensation
Cycle-by-Cycle Current Limiting
Integrated 4.5A Switch
Current Mode Control

Radiation Performance*

Total Ionizing Dose (TID) Tolerance, per TM1019.8, MIL-STD-883:
- 100kRad (Si), per condition A at 50Rads(Si)/sec
- 50kRad (Si), per condition D at 10mRads(Si)/sec
- ELDRS Pass 50kRad(Si)
Displacement Damage Defect (DDD) up to 1E12 Neutrons/cm²
Single Event Performance up to an LET of at least 80 MeVcm²/mg

* Radiation and Qualification completed on the packaging vendor’s assembled unit.

The RH1959 is a 500kHz monolithic buck mode switching regulator with a 4.5A integrated switch that will operate down to 1.21V. High switching frequency allows a considerable reduction in the size of external components. The topology is current mode for fast transient response and good loop stability.

A special high speed bipolar process and new design techniques achieve high efficiency at high switching frequency. Efficiency is maintained over a wide output current range by keeping quiescent supply current near 3.3mA and by utilizing a supply boost capacitor to saturate the power switch.

Full cycle-by-cycle short-circuit protection and thermal shutdown are provided. Standard surface mount external parts are used, including the inductor and capacitors. Optional shutdown and synchronization functions are available. Implementing shutdown reduces supply current to 30μA. Synchronization allows an external logic level signal to increase the internal oscillator from 580kHz to 1MHz.

Applications

POL Regulator Applications
Satellite System Power Supply
Microprocessor, FPGA Power Source
High Efficiency Low Voltage Subsystem Power Supply

Part Models: 3
1ku List Price: Starting From $553.47

Documentation

Data Sheet 2

RH1959: MILDICE 4.5A, 500KHz Step-Down Switching Regulator Data Sheet 08/29/2014

RH1959: 4.5A, 500kHz Step-Down Switching Regulator Data Sheet (Rev.A) 10/03/2024

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
RH1959MILDICE	DIE	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
RH1959MW	FLATPACK	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
RH1959MW-EMX	FLATPACK	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Oct 30, 2020 - 20_0325 ADI Philippines as an assembly plant to replace ADI Hillview for Radiation Hardened products in TO5 packages and die sales.
		PCN20_0325_Form Material_Report Qualification Results Summary
RH1959MILDICE	PRODUCTION
Aug 30, 2022 - 22_0196 Test Site Transfer of RH, SMD, Class-S, Special Flow, MIL-STD-883 Products from Analog Devices Milpitas to ADGT
		PCN22_0196_Form Material_Report Qualification Results Summary Qualification Results Summary Qualification Results Summary Test Correlation Report Test Correlation Report Test Correlation Report Other
RH1959MW	PRODUCTION
RH1959MW-EMX	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

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