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SN6505A-Q1

ACTIVE

Automotive, low-noise, 1-A, 160-kHz transformer driver with soft start for isolated power supplies

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Data sheet

SN6505A-Q1

ACTIVE
Data sheet Order now

Product details

Rating Automotive Vin (max) (V) 5.5 Vin (min) (V) 2.25 Iout (typ) (A) 1 Features Enable, Short-circuit protection, Slew-rate control, Spread spectrum clocking, Thermal shutdown Soft start Yes Operating temperature range (°C) -40 to 125 TI functional safety category Functional Safety-Capable Iout (max) (A) 1.5 Switching frequency (min) (kHz) 138 Switching frequency (max) (kHz) 203 Vout (max) (V) 16 Switch current limit (typ) (A) 2 Vout (min) (V) 0
Rating Automotive Vin (max) (V) 5.5 Vin (min) (V) 2.25 Iout (typ) (A) 1 Features Enable, Short-circuit protection, Slew-rate control, Spread spectrum clocking, Thermal shutdown Soft start Yes Operating temperature range (°C) -40 to 125 TI functional safety category Functional Safety-Capable Iout (max) (A) 1.5 Switching frequency (min) (kHz) 138 Switching frequency (max) (kHz) 203 Vout (max) (V) 16 Switch current limit (typ) (A) 2 Vout (min) (V) 0
SOT-23 (DBV) 6 8.12 mm² (2.9 mm × 2.8 mm)
  • AEC-Q100 (Grade 1) qualified for automotive applications
    • Device temperature grade 1: –40°C to +125°C, TA
  • Functional Safety-Capable
  • Push-pull driver for transformers
  • Wide input voltage range: 2.25 V to 5.5 V
  • High output drive: 1 A at 5 V supply
  • Low RON 0.25 Ω max at 4.5 V supply
  • Reduced conducted and radiated EMI
  • Spread spectrum clocking
  • Precision internal oscillator options: 160 kHz (SN6505A-Q1) and 420 kHz (SN6505B-Q1 and SN6505D-Q1)
  • Synchronization of multiple devices with external clock input
  • Slew-rate control
  • 1.7 A Current-limit
  • Low shutdown current: <1 µA
  • Thermal shutdown
  • Small 6-Pin SOT23 (DBV) package
  • Soft-start enabled (SN6505A-Q1 and SN6505B-Q1) to reduce in-rush current and soft-start disabled (SN6505D-Q1) for fast start-up
  • AEC-Q100 (Grade 1) qualified for automotive applications
    • Device temperature grade 1: –40°C to +125°C, TA
  • Functional Safety-Capable
  • Push-pull driver for transformers
  • Wide input voltage range: 2.25 V to 5.5 V
  • High output drive: 1 A at 5 V supply
  • Low RON 0.25 Ω max at 4.5 V supply
  • Reduced conducted and radiated EMI
  • Spread spectrum clocking
  • Precision internal oscillator options: 160 kHz (SN6505A-Q1) and 420 kHz (SN6505B-Q1 and SN6505D-Q1)
  • Synchronization of multiple devices with external clock input
  • Slew-rate control
  • 1.7 A Current-limit
  • Low shutdown current: <1 µA
  • Thermal shutdown
  • Small 6-Pin SOT23 (DBV) package
  • Soft-start enabled (SN6505A-Q1 and SN6505B-Q1) to reduce in-rush current and soft-start disabled (SN6505D-Q1) for fast start-up

The SN6505x-Q1 is a low-noise, low-EMI push-pull transformer driver, specifically designed for small form factor, isolated power supplies. It drives low-profile, center-tapped transformers from a 2.25 V to 5 V DC power supply. Very low noise and EMI are achieved by slew rate control of the output switch voltage and through Spread Spectrum Clocking (SSC). The SN6505x-Q1 consists of an oscillator followed by a gate drive circuit that provides the complementary output signals to drive ground-referenced N-channel power switches. The device includes two 1-A Power-MOSFET switches to ensure start-up under heavy loads. The switching clock can also be provided externally for accurate placement of switcher harmonics, or when operating with multiple transformer drivers. The internal protection features include a 1.7 A current limiting, under-voltage lockout, thermal shutdown, and break-before-make circuitry. SN6505A-Q1 and SN6505B-Q1 include a soft-start feature that prevents high inrush current during power up with large load capacitors. Soft-start feature has been disabled in SN6505D-Q1 for applications that require fast output start-up.SN6505A-Q1 has a 160 kHz internal oscillator for applications that need to minimize emissions whereas SN6505B-Q1 and SN6505D-Q1havea 420 kHz internal oscillators for applications that require higher efficiency and smaller transformer size. The SN6505x-Q1 is available in a small 6-pin SOT23/DBV package. The device operation is characterized for a temperature range from -40°C to 125°C.

The SN6505x-Q1 is a low-noise, low-EMI push-pull transformer driver, specifically designed for small form factor, isolated power supplies. It drives low-profile, center-tapped transformers from a 2.25 V to 5 V DC power supply. Very low noise and EMI are achieved by slew rate control of the output switch voltage and through Spread Spectrum Clocking (SSC). The SN6505x-Q1 consists of an oscillator followed by a gate drive circuit that provides the complementary output signals to drive ground-referenced N-channel power switches. The device includes two 1-A Power-MOSFET switches to ensure start-up under heavy loads. The switching clock can also be provided externally for accurate placement of switcher harmonics, or when operating with multiple transformer drivers. The internal protection features include a 1.7 A current limiting, under-voltage lockout, thermal shutdown, and break-before-make circuitry. SN6505A-Q1 and SN6505B-Q1 include a soft-start feature that prevents high inrush current during power up with large load capacitors. Soft-start feature has been disabled in SN6505D-Q1 for applications that require fast output start-up.SN6505A-Q1 has a 160 kHz internal oscillator for applications that need to minimize emissions whereas SN6505B-Q1 and SN6505D-Q1havea 420 kHz internal oscillators for applications that require higher efficiency and smaller transformer size. The SN6505x-Q1 is available in a small 6-pin SOT23/DBV package. The device operation is characterized for a temperature range from -40°C to 125°C.

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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet SN6505x-Q1 Low-Noise 1-A Transformer Drivers for Isolated Power Supplies datasheet (Rev. D) PDF | HTML Oct 26, 2020
Technical article Why signal isolation matters in 48-V HEV/EV systems (Rev. A) PDF | HTML Nov 10, 2025
Application note How to Reduce Emissions in Push-Pull Isolated Power Supplies (Rev. A) PDF | HTML Oct 5, 2021
Functional safety information SN6505x-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA PDF | HTML Jun 18, 2020
Third party document Simplify Isolated CAN, Power Interfaces for HEV 48-V Systems Jul 16, 2019

Design & development

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

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Simulation model

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SOT-23 (DBV) 6 Ultra Librarian
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