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Texas Instruments SN6505ADBVR
- Part No.:
- SN6505ADBVR
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- SOT-23-6
- Datasheet:
-
SN6505ADBVR.pdf
- Description:
- IC TRANSFORMER DRIVER 6SOT-23
- Quantity:
- Payment:
- Shipping:
Inventory:6,519
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Product details
Overview
SN6505ADBVR from Texas Instruments is a low-noise, 1-A push-pull transformer driver IC for isolated DC/DC power supplies, operating from 2.25 V to 5.5 V input, featuring 160 kHz internal oscillator, 0.25 Ω max RON at 4.5 V, and spread-spectrum clocking to minimize EMI. It drives center-tapped transformers in compact isolated supplies for industrial communications interfaces.
For engineers reviewing the SN6505ADBVR datasheet, SN6505ADBVR pinout, SN6505ADBVR application, or SN6505ADBVR equivalent, key selection factors include internal oscillator frequency (160 kHz), soft-start timing (1–8 ms), break-before-make dead time (115 ns), thermal shutdown threshold (154–181 °C), and SOT-23-6 package compatibility with space-constrained designs.
Technical Context
The SN6505ADBVR integrates a precision 160 kHz oscillator, divide-by-2 logic, and break-before-make (BBM) control to generate complementary gate-drive signals for external N-channel MOSFETs in push-pull transformer topologies. Its slew-rate control and spread-spectrum clocking directly suppress conducted and radiated EMI.
It features integrated 1.7 A current limiting, under-voltage lockout (2.25 V turn-on, 1.7 V turn-off), thermal shutdown, and soft-start to manage inrush current into large output capacitors-enabling robust startup under heavy loads without external sequencing circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage range | 2.25 V to 5.5 V - supports single-cell Li-ion, 3.3 V, and 5 V rails without external regulators |
| Output drive current | 1 A at 5 V supply - sufficient to drive low-RDS(on) external MOSFETs for up to ~1 W isolated output |
| Internal oscillator frequency | 160 kHz (typical), ±23 kHz over temperature - optimized for low EMI and larger, lower-cost transformers |
| RON (max) | 0.25 Ω at VCC = 4.5 V - minimizes conduction loss and self-heating during high-current switching |
| Break-before-make time | 115 ns - prevents shoot-through in push-pull stage by ensuring both outputs are off before transition |
| Soft-start time | 1–8 ms (10% to 90% VOUT) - limits inrush into ≥40 µF output capacitance, easing input supply stress |
| Thermal shutdown | 154–181 °C trip range with 13–17 °C hysteresis - protects against sustained overload or poor PCB thermal design |
Pinout & Package
SN6505ADBVR is housed in a 6-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D1 | Open-drain output 1 | Drives one outer terminal of center-tapped transformer primary; rated for 1 A peak, requires short PCB trace routing |
| VCC | Power supply input | Accepts 2.25–5.5 V; must be bypassed with ≥4.7 µF low-ESR capacitor near pin to stabilize switching current transients |
| D2 | Open-drain output 2 | Drives opposite outer terminal of center-tapped transformer; complements D1 with BBM timing to avoid cross-conduction |
| GND | Power ground reference | Internal sense node for MOSFET sources; requires low-inductance connection to solid ground plane for current-limit accuracy |
| EN | Enable control input | Logic-high (>0.7×VCC) enables operation; floating or grounded disables all circuitry and reduces quiescent current to <1 µA |
| CLK | External clock input | Accepts 100–600 kHz external clock; if invalid, auto-reverts to internal 160 kHz oscillator within 10–25 µs |
Key Features
| Feature | Design Value |
|---|---|
| Slew-rate control | 48 V/µs voltage slew rate on D1/D2 - reduces high-frequency harmonic content and EMI without external snubbers |
| Spread-spectrum clocking (SSC) | Modulates switching frequency to distribute energy across spectrum - lowers peak EMI by >10 dB compared to fixed-frequency operation |
| 1.7 A current limit | Programmable clamp with 0.65–2.15 A range depending on VCC - protects transformer and MOSFETs during short-circuit or overload |
| Soft-start | Gradually ramps output voltage over 1–8 ms - prevents input rail collapse when charging large isolated output capacitors |
| Thermal shutdown with hysteresis | Turns off at 154–181 °C and re-enables only after cooling by ≥13 °C - avoids thermal oscillation during marginal thermal conditions |
Applications
| Industrial RS-485 Isolation | Medical Sensor Power |
|---|---|
|
Use Scenario: Providing galvanically isolated 3.3 V or 5 V bias to RS-485 transceivers in factory automation networks exposed to ground potential differences and ESD. IC Role / Device Role / Timing Role: SN6505ADBVR drives a miniature center-tapped transformer to generate isolated secondary voltage; its 160 kHz frequency allows use of small, low-cost magnetics while SSC ensures compliance with CISPR 32 Class B emissions limits. Use Value: Enables compact, certified isolated power stage without external gate drivers or complex EMI filtering - reducing BOM count and layout area by >30% versus discrete solutions. |
Use Scenario: Powering isolated analog front-ends in portable ECG or EEG monitors where ultra-low noise and leakage current are critical for patient safety and signal fidelity. IC Role / Device Role / Timing Role: SN6505ADBVR serves as the primary-side driver in a flyback-derived isolated DC/DC stage; its low RON and precise BBM timing minimize switching noise coupling into sensitive analog measurement paths. Use Value: Delivers clean, stable isolated bias with <1 mVpp ripple (with proper filtering), meeting IEC 60601-1 creepage/clearance requirements while supporting –55°C to 125°C operation in sterilizable enclosures. |
| Low-Noise USB Isolation | Process Control Loop Power |
|
Use Scenario: Generating isolated 5 V power for USB-to-RS-422/RS-232 converters used in test equipment interfacing with legacy industrial controllers. IC Role / Device Role / Timing Role: SN6505ADBVR operates in external clock mode synchronized to system master clock - enabling deterministic placement of switching harmonics away from USB 2.0 high-speed bands (480 MHz). Use Value: Eliminates USB packet corruption caused by asynchronous switching noise, achieving >60 dB common-mode rejection without ferrite beads or shielded transformers. |
Use Scenario: Supplying isolated 12 V or 15 V bias to 4–20 mA loop-powered transmitters in hazardous-area process instrumentation (e.g., pressure, temperature sensors). IC Role / Device Role / Timing Role: SN6505ADBVR drives a custom center-tap transformer with reinforced insulation; its wide –55°C to 125°C temp range and UVLO ensure reliable startup in extreme ambient conditions. Use Value: Supports intrinsic safety (IS) barrier compliance via precise current limiting and thermal protection - enabling direct integration into Ex ia-certified field devices without external supervision circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transformer driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN6505BDGKR | 420 kHz internal oscillator, higher slew rate (152 V/µs), shorter BBM (90 ns), 1.42–2.15 A current limit | Better suited for smaller transformers and higher-efficiency designs; increased EMI risk without careful layout | Select SN6505BDGKR when size reduction and efficiency outweigh EMI sensitivity - not drop-in compatible due to frequency and timing differences |
| MAX256ASA+ | Integrated H-bridge (no external MOSFETs required), 2.7–5.5 V input, 2.5 W typical output, no external clock sync | Higher integration but fixed 2.2 MHz switching; lacks SSC, soft-start, and programmable current limit | Choose MAX256ASA+ for simplified design with lower component count where EMI filtering can be added externally and thermal management is less constrained |
Compared with SN6505ADBVR, SN6505BDGKR offers higher frequency and efficiency at the cost of stricter EMI control, while MAX256ASA+ trades flexibility and low-noise features for integration - making SN6505ADBVR optimal for space-constrained, low-EMI isolated supplies requiring precise startup and protection behavior.
Availability
SN6505ADBVR is available at Aetrix Electronics and suitable for industrial communications isolation, medical sensor biasing, low-noise USB interface power, and process control loop powering requiring stable component supply and long-term manufacturability.
Supply support for SN6505ADBVR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader delivering analog and embedded processing solutions, with deep expertise in power management, signal chain, and isolation technologies since 1930.
The SN6505x family was designed specifically for compact, low-EMI isolated DC/DC conversion in industrial, medical, and communications systems - emphasizing ease of certification, transformer flexibility, and robust protection under real-world load and thermal conditions.
FAQ
What is the function of the CLK pin on the SN6505ADBVR?
The CLK pin on the SN6505ADBVR accepts an external clock signal (100–600 kHz) to synchronize switching frequency across multiple devices or shift harmonics away from sensitive bands. If no valid clock is detected, SN6505ADBVR automatically reverts to its internal 160 kHz oscillator within 10–25 µs - ensuring uninterrupted operation without external intervention.
Does the SN6505ADBVR require external MOSFETs?
Yes, the SN6505ADBVR is a gate driver IC and requires two external N-channel MOSFETs connected to D1 and D2 pins to form the push-pull switch stage. It does not integrate power switches; instead, it provides complementary, break-before-make drive signals with controlled slew rate and current limiting to safely operate discrete MOSFETs driving center-tapped transformers.
How does the soft-start feature of the SN6505ADBVR improve system reliability?
The soft-start feature of the SN6505ADBVR gradually ramps the output voltage over 1–8 ms, limiting inrush current into large output capacitors (e.g., ≥40 µF). This prevents input supply droop, avoids tripping upstream current limits, and reduces mechanical stress on transformer windings - significantly improving startup reliability in systems with high-capacitance isolated outputs.
Can the SN6505ADBVR be used with transformers designed for the SN6505B variant?
No - SN6505ADBVR's 160 kHz nominal frequency differs from SN6505B's 420 kHz, so transformers optimized for SN6505B (e.g., Wurth 750315371) exhibit mismatched impedance, reduced efficiency, and potential saturation when used with SN6505ADBVR. Always select transformers specified for 160 kHz operation, such as Wurth 750315240 or Coilcraft DA2303-AL.
What is the maximum continuous output current capability of the SN6505ADBVR-driven power stage?
The SN6505ADBVR itself delivers up to 1 A per output (D1/D2) at 5 V supply, but actual continuous isolated output current depends on transformer turns ratio, core material, switching frequency, and thermal design. With appropriate magnetics (e.g., Wurth 750315240) and PCB layout, typical designs achieve 250–400 mA at 5 V secondary under full-load, derated above 85°C ambient.
SN6505ADBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Transformer Driver
- Current - Supply:
- 1mA
- Voltage - Supply:
- 2.25V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
SN6505ADBVR FAQ
1.How can I place an order for SN6505ADBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN6505ADBVR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN6505ADBVR reliable?
The price and inventory of SN6505ADBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN6505ADBVR is usually 5 days.
3.What payment methods are accepted for SN6505ADBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN6505ADBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN6505ADBVR?
SN6505ADBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN6505ADBVR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN6505ADBVR?
For technical support, including SN6505ADBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN6505ADBVR requirements.
6.How does Aetrix verify that SN6505ADBVR is sourced from the original manufacturer or authorized distributors?
All SN6505ADBVR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN6505ADBVR meets industry standards.
7.What is the process for return or replacement of SN6505ADBVR?
All SN6505ADBVR units undergo pre-shipment inspection (PSI). If there is an issue with SN6505ADBVR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN6505ADBVR part is unused and in its original packaging.
Return procedure for SN6505ADBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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