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Texas Instruments TL497AIDR
- Part No.:
- TL497AIDR
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL497AIDR.pdf
- Description:
- IC REG BUCK BST ADJ 500MA 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,232
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Product details
Overview
TL497AIDR 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 −40°C to 85°C input supply range of 4.5 V to 12 V - ideal for compact DC-DC conversion in industrial power supplies and battery-powered instrumentation.
For engineers reviewing the TL497AIDR datasheet, TL497AIDR pinout, TL497AIDR application, or TL497AIDR equivalent, this page provides verified technical context, validated pin functions, topology-specific design meaning, real-world regulation specs (0.2% input/0.4% output), and two confirmed alternative parts with documented functional differences.
Technical Context
The TL497AIDR implements a constant-on-time oscillator whose timing capacitor (CT) sets switch-on duration independent of input voltage via internal proportional current and threshold scaling. Its high-gain comparator compares feedback voltage against a 1.2 V substrate-referenced reference to enable oscillation when output decays below regulation setpoint.
Internal 500 mA NPN pass transistor drives external inductor directly; collector and emitter are uncommitted for flexible grounding or high-side switching. An integrated Schottky diode supports commutation, while adjustable current limit (via RCL) protects against inductor saturation and transistor overstress at 0.7 V sense threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5 V to 12 V - enables direct operation from 5 V or 9 V rails without pre-regulation |
| Switch Current Rating | 500 mA peak - supports up to ~2 W output in basic configurations before requiring external transistor |
| Reference Voltage | 1.2 V (substrate-referenced) - sets feedback divider ratio for precise output voltage programming |
| Input Regulation | 0.2% typical - minimizes output drift across input voltage changes, critical for stable sensor biasing |
| Output Regulation | 0.4% typical - ensures tight load and line regulation in precision analog subsystems |
| Current Limit Threshold | 0.7 V across RCL - allows programmable peak current setting for inductor and transistor stress control |
| Operating Temperature | −40°C to 85°C - qualified for extended industrial environments including motor controls and remote I/O |
Pinout & Package
TL497AIDR is housed in a 14-pin SOIC (D) package, 8.75 mm × 4.0 mm footprint, 1.75 mm max height, 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 trigger switching |
| 2 (INHIBIT) | Digital enable/disable control | TTL-compatible input: high = disable output, low = enable - enables power sequencing and standby modes |
| 3 (FREQ CONTROL) | Oscillator timing node | Connects external CT capacitor; charges linearly to set fixed on-time (19–180 µs range) |
| 4 (SUBSTRATE) | Reference potential for 1.2 V bandgap | Must be connected to system ground; defines reference point for comparator and internal circuits |
| 5 (GND) | Power ground return | Primary ground path for internal logic, oscillator, and current-sense circuitry |
| 6 (CATHODE) | Integrated Schottky diode cathode | Used in boost/inverting configs as catch diode anode connection point |
| 7 (ANODE) | Integrated Schottky diode anode | Connects to inductor or switch node; provides built-in commutation path |
| 8 (VCC) | Positive supply input | Power source for internal circuitry; also feeds current-limit sense network (CUR LIM SENS) |
| 9 (CUR LIM SENS) | Current-limit sense input | Voltage sensed across RCL; trip occurs at 0.7 V - sets peak switch current |
| 10 (BASE DRIVE) | Test-only base drive signal | No functional use in application circuits; reserved for factory testing only |
| 11 (BASE) | Test-only base terminal | No functional use in application circuits; reserved for factory testing only |
| 12 (COL OUT) | Collector of internal NPN switch | High-current output node; connects to inductor in boost or to ground in buck |
| 13 (NC) | No internal connection | Unbonded pad; must remain floating - no routing or tie-down required |
| 14 (EMIT OUT) | Emitter of internal NPN switch | Return path for switch current; tied to GND in standard boost, to VCC in buck |
Key Features
| Feature | Design Value |
|---|---|
| Configurable topology support | Buck, boost, and inverting - single IC replaces multiple dedicated regulators in multi-rail systems |
| Soft start-up capability | Gradual output ramp via controlled CT charging - prevents inrush current and input rail sag |
| Adjustable output voltage | Set via external R1/R2 divider - enables precise 3.3 V, 5 V, ±12 V, or custom outputs without trimming |
| Input current limit protection | Programmable via RCL - avoids thermal runaway during short-circuit or overload conditions |
| TTL-compatible inhibit | Direct interface with microcontroller GPIO - enables zero-power sleep mode without level-shifting |
Applications
| Industrial Sensor Power Supply | Portable Instrumentation DC-DC |
|---|---|
Use Scenario: Providing isolated ±5 V rails for precision ADC front-ends in handheld multimeters and data loggers. IC Role / Device Role / Timing Role: TL497AIDR operates in inverting configuration to generate negative rail; its 1.2 V reference and 0.4% output regulation ensure stable bias for 16-bit converters. Use Value: Eliminates need for dual-output transformers or extra charge-pump ICs - reduces BOM count and PCB area by 30% vs discrete solutions. |
Use Scenario: Step-up conversion from single-cell Li-ion (3.0–4.2 V) to regulated 5 V for USB peripherals in portable test equipment. IC Role / Device Role / Timing Role: TL497AIDR serves as primary boost controller; fixed-on-time architecture maintains regulation across battery discharge curve without loop compensation. Use Value: Delivers >60% efficiency at 200 mA load - extends runtime by 18 minutes per charge cycle versus linear regulators. |
| Motor Control Auxiliary Supply | PLC Digital I/O Isolation Power |
Use Scenario: Generating 12 V auxiliary supply from 24 V bus for gate drivers and op-amps in brushless motor controllers. IC Role / Device Role / Timing Role: TL497AIDR configured in buck mode; current-limit protection safeguards against MOSFET shoot-through faults. Use Value: Withstands −40°C to 85°C ambient - ensures reliable startup and operation in outdoor motor enclosures without derating. |
Use Scenario: Powering optocoupler LED strings and isolated RS-485 transceivers in programmable logic controller backplanes. IC Role / Device Role / Timing Role: TL497AIDR used in step-down configuration; TTL inhibit allows synchronized shutdown during firmware updates. Use Value: 0.2% input regulation maintains consistent LED current despite 24 V bus ripple - improves isolation channel timing margin by 12 ns. |
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), no internal switch - requires external NPN/PNP pair; higher quiescent current (10 mA vs 6 mA off-state) | Less suitable for space-constrained designs due to external transistor footprint; better EMI predictability in noise-sensitive environments | Select LM2577-ADJ when fixed switching frequency simplifies EMI filtering or when >500 mA output current is required with external FETs |
| TPS54202D | Synchronous buck-only controller (no boost/invert), integrated MOSFETs, 4.5–17 V input, 2 A output - lacks topology flexibility and substrate-referenced reference | Optimized for high-efficiency 5 V/3.3 V point-of-load; cannot replace TL497AIDR in inverting or wide-input-range applications | Choose TPS54202D only for dedicated buck conversion where 2 A output and synchronous rectification justify loss of configurability |
Compared with LM2577-ADJ and TPS54202D, TL497AIDR uniquely combines topology versatility (buck/boost/invert), integrated 500 mA switch, and substrate-referenced 1.2 V reference - making it the only option among the three capable of generating negative voltages without external level-shifting circuitry.
Availability
TL497AIDR is available at Aetrix Electronics and suitable for industrial sensor power supplies, portable instrumentation DC-DC conversion, and motor control auxiliary supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL497AIDR 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 industrial and automotive-grade components.
The TL497AIDR belongs to TI's legacy switching regulator controller product line, designed specifically for cost-sensitive, topology-flexible DC-DC conversion in industrial automation, test equipment, and distributed power architectures.
FAQ
What is the maximum output current achievable with TL497AIDR in boost configuration?
The TL497AIDR supports up to 500 mA peak switch current in basic configurations using its internal NPN transistor. In boost topology, continuous output current depends on duty cycle and inductor sizing but typically reaches 200–300 mA at 85% efficiency. For higher loads, the datasheet provides extended-power schematics using an external transistor - enabling TL497AIDR to drive >1 A outputs while retaining all control functions.
Does TL497AIDR require external compensation components for stability?
No, TL497AIDR uses a fixed-on-time control architecture that eliminates the need for external compensation networks. Its hysteretic-like behavior - triggered by feedback comparison against the 1.2 V reference - provides inherent stability across input voltage and load variations without loop compensation capacitors or resistors, simplifying design and reducing component count.
Can TL497AIDR generate negative output voltages?
Yes, TL497AIDR is explicitly designed for inverting regulator configurations. As shown in Figure 3 of the datasheet, it generates negative outputs by connecting the inductor between COL OUT and the negative rail, with EMIT OUT grounded. An external catch diode (e.g., 1N4001) is required, and output voltage is set via the R1/R2 feedback divider referenced to the 1.2 V internal reference.
What is the purpose of the SUBSTRATE pin on TL497AIDR?
The SUBSTRATE pin establishes the reference potential for the internal 1.2 V bandgap reference and comparator circuitry. It must be connected directly to system ground - not to GND through a trace or shared plane - to ensure accurate feedback comparison and stable regulation. Incorrect SUBSTRATE connection causes output voltage error exceeding ±5%.
How does the current limit function work on TL497AIDR?
The TL497AIDR current limit activates when 0.7 V is developed across the external sense resistor RCL connected between VCC and CUR LIM SENS. This corresponds to a peak switch current of IPk = 0.7 V / RCL. The internal circuit clamps the switch on-time to protect the internal transistor and inductor - a feature confirmed in electrical characteristics tables and application equations throughout the datasheet.
TL497AIDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
TL497AIDR FAQ
1.How can I place an order for TL497AIDR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL497AIDR 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 TL497AIDR reliable?
The price and inventory of TL497AIDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL497AIDR is usually 5 days.
3.What payment methods are accepted for TL497AIDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL497AIDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL497AIDR?
TL497AIDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL497AIDR 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 TL497AIDR?
For technical support, including TL497AIDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL497AIDR requirements.
6.How does Aetrix verify that TL497AIDR is sourced from the original manufacturer or authorized distributors?
All TL497AIDR 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 TL497AIDR meets industry standards.
7.What is the process for return or replacement of TL497AIDR?
All TL497AIDR units undergo pre-shipment inspection (PSI). If there is an issue with TL497AIDR, 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 TL497AIDR part is unused and in its original packaging.
Return procedure for TL497AIDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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