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

Inventory: 10,160  

Quality information

RoHS Yes
Lead finish / Ball material NIPDAU
MSL rating / Peak reflow Level-1-260C-UNLIM
Quality, reliability
& packaging information

Information included:

  • RoHS
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
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Packaging information

Package | Pins Package qty | Carrier: Operating temperature range (℃)
SOT-23 (DBV) | 6 250 | SMALL T&R
-55 to 125
Package | Pins SOT-23 (DBV) | 6
Package qty | Carrier: 250 | SMALL T&R
Operating temperature range (℃) -55 to 125
View TI packaging information

Features for the SN6505A

  • 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
  • Ultra-low EMI
  • Spread spectrum clocking
  • Precision internal oscillator options: 160 kHz (SN6505A) and 420 kHz (SN6505B)
  • Synchronization of multiple devices with external clock input
  • Slew-rate control
  • 1.7 A Current-limit
  • Low shutdown current: <1 µA
  • Thermal shutdown
  • Wide temperature range: –55°C to 125°C
  • Small 6-Pin SOT23 (DBV) package
  • Soft-start to reduce In-rush current

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Description for the SN6505A

The SN6505x 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. Ultra-low noise and EMI are achieved by slew rate control of the output switch voltage and throughSpread Spectrum Clocking (SSC). The SN6505x 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.SN6505xincludes a soft-start feature that prevents high inrush currentduring power up with large load capacitors. SN6505A has a 160 kHz internaloscillator for applications that need to minimize emissions whereas SN6505Bhas a 420 kHz internaloscillators for applications that require higher efficiency and smaller transformer size. TheSN6505x is available in asmall 6-pin SOT23/DBV package. The device operation is characterized for a temperature range from–55°C to 125°C.


Qty Price (USD)
1-99 1.825
100-249 1.488
250-999 1.17
1,000+ 0.992

Additional package qty | carrier options

Package qty | Carrier 3,000 | LARGE T&R
Inventory 33,262
Qty | Price (USD) 1ku | 0.862 1-99 1.586 100-249 1.293 250-999 1.016 1,000+ 0.862
Custom reel may be available