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UC1845A-SP

ACTIVE

Radiation-tolerant QMLV, 30-V input, 1-A single-output 500-kHz PWM controller, 50% duty cycle

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Data sheet

UC1845A-SP

ACTIVE
Data sheet Order now

Product details

Vin (max) (V) 25 Operating temperature range (°C) -55 to 125 Control mode Current Topology Boost, Flyback, Forward Rating Space Features Error amplifier, Fixed frequency, Multi-topology Duty cycle (max) (%) 50
Vin (max) (V) 25 Operating temperature range (°C) -55 to 125 Control mode Current Topology Boost, Flyback, Forward Rating Space Features Error amplifier, Fixed frequency, Multi-topology Duty cycle (max) (%) 50
CDIP (JG) 8 64.032 mm² 9.6 x 6.67 CFP (HKU) 10 45.4896 mm² 7.02 x 6.48 LCCC (FK) 20 79.0321 mm² 8.89 x 8.89
  • QML Class V (QMLV) Qualified, SMD 5962-86704
  • 5962P8670411Vxx: (1)
    • Radiation Hardness Assurance (RHA) up to
      30-krad(Si) Total Ionizing Dose (TID)
    • Passes Functional and Specified Post-Radiation Parametric Limits at 45 krad at LDR (10 mrad(Si)/s) per 1.5× Over Test as Defined in MIL-STD-883 Test Method 1019.9 Paragraph 3.13.3.b
    • Exhibits Low Dose Rate Sensitivity (2) but Remains Within the Pre-Radiation Electrical Limits at 30-krad Total Dose Level, as Allowed by MIL-STD-883, TM1019
  • Optimized for DC-to-DC Converter Applications
  • Low Start-Up Current (< 0.5 mA)
  • Trimmed Oscillator Discharge Current
  • Automatic Feed Forward Compensation
  • Pulse-by-Pulse Current Limiting
  • Enhanced Load Response Characteristics
  • Undervoltage Lockout (UVLO) With Hysteresis
  • Double-Pulse Suppression
  • High-Current Totem-Pole Output
  • Internally-Trimmed Bandgap Reference
  • 500-kHz Operation
  • Low RO Error Amplifier
  • Qualified Over the Military Temperature Range (–55°C to 125°C)

(1)Improved TID radiation performance only applies to RHA device type 11.

(2)The affected parameter Reference Output Voltage, VREF Radiation Drift Curve (see VREF Radiation Drift Curve).

  • QML Class V (QMLV) Qualified, SMD 5962-86704
  • 5962P8670411Vxx: (1)
    • Radiation Hardness Assurance (RHA) up to
      30-krad(Si) Total Ionizing Dose (TID)
    • Passes Functional and Specified Post-Radiation Parametric Limits at 45 krad at LDR (10 mrad(Si)/s) per 1.5× Over Test as Defined in MIL-STD-883 Test Method 1019.9 Paragraph 3.13.3.b
    • Exhibits Low Dose Rate Sensitivity (2) but Remains Within the Pre-Radiation Electrical Limits at 30-krad Total Dose Level, as Allowed by MIL-STD-883, TM1019
  • Optimized for DC-to-DC Converter Applications
  • Low Start-Up Current (< 0.5 mA)
  • Trimmed Oscillator Discharge Current
  • Automatic Feed Forward Compensation
  • Pulse-by-Pulse Current Limiting
  • Enhanced Load Response Characteristics
  • Undervoltage Lockout (UVLO) With Hysteresis
  • Double-Pulse Suppression
  • High-Current Totem-Pole Output
  • Internally-Trimmed Bandgap Reference
  • 500-kHz Operation
  • Low RO Error Amplifier
  • Qualified Over the Military Temperature Range (–55°C to 125°C)

(1)Improved TID radiation performance only applies to RHA device type 11.

(2)The affected parameter Reference Output Voltage, VREF Radiation Drift Curve (see VREF Radiation Drift Curve).

The UC1845A-SP control IC is a radiation hardened pin-for-pin compatible version of the UC184x family. It is primarily suited for Satellites and other harsh environment applications. Providing the necessary characteristics to control current-mode switched-mode power supplies, this device has improved features. Start-up current is specified to be less than 0.5 mA and oscillator discharge is trimmed to 8.3 mA. During UVLO, the output stage can sink at least 10 mA at less than 1.2 V for VCC over 5 V.

The Device Comparison Table shows the difference between members of this family. Reference the individual product data sheets for ordering the radiation-improved version if available.

The UC1845A-SP control IC is a radiation hardened pin-for-pin compatible version of the UC184x family. It is primarily suited for Satellites and other harsh environment applications. Providing the necessary characteristics to control current-mode switched-mode power supplies, this device has improved features. Start-up current is specified to be less than 0.5 mA and oscillator discharge is trimmed to 8.3 mA. During UVLO, the output stage can sink at least 10 mA at less than 1.2 V for VCC over 5 V.

The Device Comparison Table shows the difference between members of this family. Reference the individual product data sheets for ordering the radiation-improved version if available.
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Technical documentation

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Type Title Date
* Data sheet UC1845A-SP QML class V, radiation hardened current-mode PWM controller datasheet (Rev. A) PDF | HTML 21 Feb 2019
* Radiation & reliability report UC1845A-SP Neutron Displacement Damage Characterization Test Report 05 May 2021
* SMD UC1845A-SP SMD 5962-86704 08 Jul 2016
* Radiation & reliability report UC1845A-SP TID Radiation Test Report 19 May 2015
Application brief DLA Approved Optimizations for QML Products (Rev. B) PDF | HTML 23 Oct 2024
Selection guide TI Space Products (Rev. J) 12 Feb 2024
More literature TI Engineering Evaluation Units vs. MIL-PRF-38535 QML Class V Processing (Rev. A) 31 Aug 2023
Application note QML flow, its importance, and obtaining lot information (Rev. C) 30 Aug 2023
Application note Heavy Ion Orbital Environment Single-Event Effects Estimations (Rev. A) PDF | HTML 17 Nov 2022
Application note Single-Event Effects Confidence Interval Calculations (Rev. A) PDF | HTML 19 Oct 2022
Application brief Controlling Input Power for Present and Next-Generation Power Controllers PDF | HTML 14 Dec 2020
Application note DLA Standard Microcircuit Drawings (SMD) and JAN Part Numbers Primer 21 Aug 2020
Application note Hermetic Package Reflow Profiles, Termination Finishes, and Lead Trim and Form PDF | HTML 18 May 2020
E-book Radiation Handbook for Electronics (Rev. A) 21 May 2019
Technical article Power Tips: Calculate an R-C snubber in seven steps PDF | HTML 05 May 2016

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Simulation model

UC1845A-SP TINA-TI Transient Reference Design

SLUM676.TSC (6353 KB) - TINA-TI Reference Design
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Simulation model

UC1845A-SP TINA-TI Transient Spice Model

SLUM677.ZIP (19 KB) - TINA-TI Spice Model
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Simulation model

UC1845A-SP Unencrypted PSpice Transient Model

SLUM665.ZIP (3 KB) - PSpice Model
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Package Pins CAD symbols, footprints & 3D models
CDIP (JG) 8 Ultra Librarian
CFP (HKU) 10 Ultra Librarian
LCCC (FK) 20 Ultra Librarian
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