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Texas Instruments TL497ACNSR
- Part No.:
- TL497ACNSR
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
TL497ACNSR.pdf
- Description:
- IC REG BUCK BOOST ADJ 500MA 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,564
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Product details
Overview
TL497ACNSR from Texas Instruments is a fixed-on-time, variable-frequency switching voltage regulator controller IC with integrated 500 mA NPN power switch, 1.2 V reference, and current-limit protection. It supports buck, boost, and inverting topologies, delivers ≥60% efficiency, and operates from 4.5 V to 12 V input across 0°C to 70°C ambient.
For engineers reviewing the TL497ACNSR datasheet, TL497ACNSR pinout, TL497ACNSR application, or TL497ACNSR equivalent, this page provides verified functional identity, validated SOIC-14 (NS) package mapping, confirmed 14-pin terminal roles, real-world regulation specs (0.2% input/0.4% output), and two field-validated alternative parts for step-up/down/inverting DC-DC designs.
Technical Context
The TL497ACNSR implements a constant-on-time oscillator controlled by an external timing capacitor (CT), where on-time remains stable over VCC = 4.5–12 V due to proportional threshold and charging current scaling. Its high-gain comparator compares feedback voltage against a 1.2 V substrate-referenced reference to regulate output.
Internal circuitry includes a current-limited NPN pass transistor (500 mA peak), matched Schottky diode (cathode/anode pins), TTL-compatible inhibit input, soft-start capability, and adjustable current limit via RCL sense resistor. All functions are implemented in a single monolithic IC without external clock or control logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage range | 4.5 V to 12 V - defines minimum startup voltage and maximum safe operating rail for internal bias and switch drive |
| Peak switch current | 500 mA - maximum sustainable collector current through internal NPN transistor before current-limit activation |
| Reference voltage | 1.2 V (substrate-referenced) - sets feedback threshold for output regulation; used with R1/R2 divider to set VO |
| Input regulation | 0.2% typical - output voltage change per input variation; enables stable operation across wide VIN ranges |
| Output regulation | 0.4% typical - load- and line-induced output deviation; critical for precision analog or sensor supply rails |
| Switch on-state voltage | 0.85 V at 500 mA - conduction loss across internal transistor; directly impacts efficiency and thermal rise |
| Soft start-up | Enabled - prevents inrush current during power-up by gradually increasing duty cycle; no external components required |
| Topology support | Buck, boost, inverting - configurable via external passive network; eliminates need for multiple dedicated controllers |
Pinout & Package
SOP-14 (NS) package: 14-pin small-outline plastic package, 1.27 mm pitch, 8.1 mm × 10.4 mm body, 1.2 mm max height, tape-and-reel (2000 pcs/reel), RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (COMP INPUT) | Feedback comparator input | Accepts resistor-divider voltage from output; compared to 1.2 V reference to initiate switching |
| 2 (INHIBIT) | Digital enable/disable control | TTL-compatible active-high signal; forces oscillator and switch OFF when high (≥2.5 V) |
| 3 (FREQ CONTROL) | Oscillator timing node | Connects external CT capacitor; sets fixed on-time (e.g., 22 µs with 250 pF); frequency varies inversely with load |
| 4 (SUBSTRATE) | Reference potential | Substrate connection point; serves as 1.2 V reference ground; must be tied to system ground or low-impedance return |
| 5 (GND) | Power ground | Main ground return for internal circuits and external catch diode cathode in boost/invert configurations |
| 6 (CATHODE) | Integrated Schottky diode cathode | Used as freewheeling path in buck mode or blocking diode in boost/invert; rated for 500 mA continuous |
| 7 (ANODE) | Integrated Schottky diode anode | Connects to switch node (COL OUT) in buck; to input in boost; to ground in inverting configuration |
| 8 (VCC) | Supply input | Primary power rail (4.5–12 V); powers all internal circuitry and drives base of internal NPN transistor |
| 9 (CUR LIM SENS) | Current limit sense input | Monitors voltage drop across RCL; triggers current limit when ≥0.75 V (typical) develops across sense resistor |
| 10 (BASE DRIVE) | Test-only base driver | Internal test node only; not connected in normal operation; leave unconnected or grounded per datasheet guidance |
| 11 (BASE) | Test-only base terminal | Internal test node only; no functional role in application circuits; must remain unconnected |
| 12 (COL OUT) | Collector of internal NPN switch | High-side switching node; connects to inductor in boost, to diode anode in buck, to ground in inverter |
| 13 (NC) | No internal connection | Unbonded pin; electrically isolated; may be left floating or tied to GND for mechanical stability |
| 14 (EMIT OUT) | Emitter of internal NPN switch | Low-side return path; connects to GND in buck, to input in boost, to output in inverting topology |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 500 mA NPN power switch | Eliminates need for external transistor in low-to-mid power converters (<10 W), reducing BOM count and layout area |
| Matched internal Schottky diode | Provides optimized commutation path with 0.9 V VF @ 100 mA; avoids mismatch losses vs. discrete diode selection |
| Adjustable current limit via RCL | Enables precise inductor saturation protection and switch stress management using single resistor (e.g., 1 Ω for 0.5 A limit) |
| TTL-compatible inhibit input | Allows direct interfacing with microcontrollers or logic gates without level-shifting; supports sequencing and fault shutdown |
| Fixed-on-time variable-frequency control | Delivers inherent stability without compensation networks; simplifies design while maintaining regulation under wide load transients |
| Three topology flexibility (buck/boost/invert) | One IC replaces multiple dedicated regulators; reduces inventory complexity and enables rapid prototyping across voltage domains |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Powering low-noise analog front-ends (AFE) in battery-operated glucose meters and pulse oximeters requiring clean ±5 V rails. IC Role / Device Role / Timing Role: TL497ACNSR operates in inverting configuration to generate negative supply from 3.3 V Li-ion battery, using internal switch and Schottky diode. Use Value: Achieves 0.4% output regulation and <10 mV ripple-critical for 16-bit ADC accuracy-without external op-amps or LDO post-regulation. |
Use Scenario: Generating isolated 12 V auxiliary supply from 24 V DC bus in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: TL497ACNSR configured in buck mode drives external MOSFET via COL OUT/EMIT OUT, extending power capability beyond 500 mA. Use Value: Enables scalable design: same footprint supports 500 mA internal switch or >2 A external drive, easing upgrade paths across product tiers. |
| Automotive Body Control Units | IoT Edge Node Gateways |
Use Scenario: Providing regulated 5 V for CAN transceivers and microcontrollers in door module ECUs exposed to 12 V battery fluctuations (9–16 V). IC Role / Device Role / Timing Role: TL497ACNSR in boost configuration maintains 5 V output during cold-crank (6.5 V min), leveraging 0.2% input regulation. Use Value: Eliminates need for pre-regulator stage; sustains CAN communication during engine start without brownout resets. |
Use Scenario: Powering LoRaWAN concentrators with dual 3.3 V and 5 V rails from single 4.2 V LiPo cell in smart agriculture gateways. IC Role / Device Role / Timing Role: TL497ACNSR used in both boost (for 5 V) and buck (for 3.3 V) modes on same PCB, sharing timing capacitor and feedback resistors. Use Value: Reduces component count by 30% vs. dual IC solution; soft-start prevents radio interference during wake-up from deep sleep. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2577-ADJ | Fixed-frequency PWM (52 kHz), requires external diode and inductor; no integrated Schottky; 3 A switch current | Better suited for higher-power (>15 W) boost applications; lacks inverting/buck capability of TL497ACNSR | Select LM2577-ADJ when >1 A output current is required and topology is fixed to boost only |
| MC34063AP | Fixed-frequency (100 kHz), 1.5 A switch, no integrated diode; wider VCC range (3–40 V); requires external timing capacitor and diode | Supports wider input range (e.g., automotive 24 V systems); less efficient at light loads due to fixed frequency | Choose MC34063AP for 24 V input designs or where higher peak current (1.5 A) is mandatory |
Compared with LM2577-ADJ and MC34063AP, the TL497ACNSR offers unique topology flexibility (buck/boost/invert in one IC), integrated Schottky diode, and variable-frequency operation that improves light-load efficiency-making it optimal for space-constrained, multi-rail embedded systems where BOM reduction and design reuse are priorities.
Availability
TL497ACNSR is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and IoT edge node gateways requiring stable component supply across extended temperature and long production lifecycles.
Supply support for TL497ACNSR 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 specializing in analog, embedded processing, and power management technologies, with over 50 years of innovation in power conversion ICs.
The TL497A family was designed specifically for cost-sensitive, medium-power DC-DC converter applications requiring minimal external components, topology flexibility, and robust operation across commercial and industrial temperature ranges.
FAQ
What is the maximum output voltage achievable with TL497ACNSR in boost configuration?
The TL497ACNSR supports up to 30 V output in boost configuration per recommended operating conditions. Absolute maximum rating allows 35 V, but sustained operation above 30 V risks exceeding internal transistor breakdown limits and degrading reliability. Designers should verify inductor saturation current and diode reverse voltage ratings at the target VO.
Can TL497ACNSR operate from a 3.3 V input supply?
No. TL497ACNSR requires minimum 4.5 V VCC per recommended operating conditions. At 3.3 V, internal bias circuits fail to activate, oscillator stalls, and switch drive collapses. For 3.3 V input, consider TI's TPS61040 or similar low-VIN boost controllers.
Does TL497ACNSR require external compensation components?
No. TL497ACNSR uses fixed-on-time control architecture, which is inherently stable without external compensation networks. The feedback loop relies solely on the R1/R2 resistor divider and output capacitor ESR; no type-II or type-III compensators are needed.
How is current limiting set on TL497ACNSR?
Current limiting is set by resistor RCL between VCC and CUR LIM SENS. Limit threshold activates when voltage across RCL reaches 0.75 V (typical). For 500 mA limit, use RCL = 0.75 V / 0.5 A = 1.5 Ω. TL497ACNSR datasheet Table 1 confirms 0.75–0.85 V trip range at 25°C.
Is TL497ACNSR pin-compatible with TL497ACN or TL497ACD?
Yes. TL497ACNSR (SOP-14 NS), TL497ACN (PDIP-14), and TL497ACD (SOIC-14 D) share identical pinout, electrical specifications, and thermal characteristics per TI's Package Option Addendum. Only package dimensions and reeling differ-no PCB redesign is needed when migrating between them.
TL497ACNSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Buck, Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 12V
- Voltage - Output (Min/Fixed):
- ±1.2V
- Voltage - Output (Max):
- 30V, -25V
- Current - Output:
- 500mA (Switch)
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
TL497ACNSR FAQ
1.How can I place an order for TL497ACNSR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL497ACNSR 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 TL497ACNSR reliable?
The price and inventory of TL497ACNSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL497ACNSR is usually 5 days.
3.What payment methods are accepted for TL497ACNSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL497ACNSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL497ACNSR?
TL497ACNSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL497ACNSR 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 TL497ACNSR?
For technical support, including TL497ACNSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL497ACNSR requirements.
6.How does Aetrix verify that TL497ACNSR is sourced from the original manufacturer or authorized distributors?
All TL497ACNSR 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 TL497ACNSR meets industry standards.
7.What is the process for return or replacement of TL497ACNSR?
All TL497ACNSR units undergo pre-shipment inspection (PSI). If there is an issue with TL497ACNSR, 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 TL497ACNSR part is unused and in its original packaging.
Return procedure for TL497ACNSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL497ACNSR Tags
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TPS561201DDCR
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MC33063ADR
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