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Automotive, low-noise 1-A, 420-kHz transformer driver for isolated power supplies

Availability: 522


Package | PIN: SOT-23 (DBV) | 6
Temp: Q (-40 to 125)
Carrier: Cut Tape
Qty Price
1-9 $3.08
10-24 $2.76
25-99 $2.57
100-249 $2.24
250-499 $2.06
500-749 $1.73
750-999 $1.42
1,000+ $1.30


  • AEC-Q100 (Grade 1) qualified for automotive applications
    • Device temperature grade 1: –40°C to +125°C,TA
  • 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

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Texas Instruments  SN6505BQDBVTQ1

The SN6505x-Q1 is alow-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. Verylow noise and EMI are achieved by slew rate control of the output switch voltage and throughSpread Spectrum Clocking (SSC). The SN6505x-Q1 consists of an oscillator followed by a gate drive circuit thatprovides the complementary output signals to drive ground-referenced N-channel power switches. Thedevice includes two 1-A Power-MOSFET switches to ensure start-up under heavy loads. The switchingclock can also be provided externally for accurate placement of switcher harmonics, or whenoperating with multiple transformer drivers. The internal protection features include a 1.7 Acurrent limiting, under-voltage lockout, thermal shutdown, and break-before-make circuitry.SN6505A-Q1 and SN6505B-Q1include a soft-start feature that prevents high inrush currentduring power up with large load capacitors. Soft-start feature has beendisabled in SN6505D-Q1 for applications that require fast output start-up. SN6505A-Q1 has a 160 kHz internaloscillator for applications that need to minimize emissions whereas SN6505B-Q1 and SN6505D-Q1have a 420 kHz internaloscillators for applications that require higher efficiency and smaller transformer size. TheSN6505x-Q1 is available in asmall 6-pin SOT23/DBV package. The device operation is characterized for a temperature range from-40°C to 125°C.