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Texas Instruments TL497ACDR
- Part No.:
- TL497ACDR
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL497ACDR.pdf
- Description:
- IC REG BUCK BST ADJ 500MA 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,688
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Product details
Overview
TL497ACDR from Texas Instruments is a fixed-on-time, variable-frequency switching voltage regulator controller IC with integrated 500 mA NPN power switch and matched Schottky diode. It supports buck, boost, and inverting topologies, delivers ≥60% efficiency, features adjustable output voltage via external resistor ladder, and includes input current limit protection and TTL-compatible inhibit control - used in compact DC-DC converters for portable instrumentation and industrial sensors.
For engineers reviewing the TL497ACDR datasheet, TL497ACDR pinout, TL497ACDR application, or TL497ACDR equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, topology-specific use cases, and two confirmed alternative parts with documented functional differences.
Technical Context
The TL497ACDR implements a constant-on-time oscillator whose switch duration is set by an external capacitor (CT) charged by an internal current source proportional to VCC, ensuring stable on-time across 4.5 V–12 V input range. Its high-gain comparator compares feedback voltage against a 1.2 V reference (relative to substrate) to regulate output voltage.
It integrates a current-limited NPN pass transistor (peak 500 mA), uncommitted collector/emitter terminals, and an on-chip Schottky diode for commutation. Current limiting is set by a sense resistor (RCL) that triggers at 0.7 V drop, and external gating is enabled via TTL-compatible INHIBIT pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching topology support | Buck, boost, and inverting configurations - enables single-IC solution for multiple voltage conversion needs without redesigning core control logic. |
| Integrated switch current rating | 500 mA peak - sufficient for low-to-moderate power DC-DC stages (e.g., 5 V → 12 V @ 200 mA) without external transistor. |
| Reference voltage | 1.2 V (vs. substrate) - sets feedback threshold; used with R1/R2 divider to precisely program output voltage in all configurations. |
| Input regulation | 0.2% typical - minimizes output drift over VCC variation, critical for stable operation when input supply has ripple or sag. |
| Output regulation | 0.4% typical - ensures tight load/line regulation in closed-loop feedback, supporting precision analog or sensor bias rails. |
| Soft start-up | Internal soft-start capability - prevents inrush current and output overshoot during power-up, improving system reliability. |
| Operating temperature | 0°C to 70°C - qualified for commercial-grade embedded systems including test equipment and industrial controllers. |
Pinout & Package
TL497ACDR 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, tape-and-reel packaging (2500 units/reel).
| 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 cycle when output sags. |
| 2 (INHIBIT) | Enable/disable control input | TTL-compatible digital gate: high = disable output, low = enable - allows microcontroller-based power sequencing. |
| 3 (FREQ CONTROL) | Oscillator timing node | Connects external CT capacitor; controls fixed on-time (19–180 µs) and thus switching frequency inversely. |
| 4 (SUBSTRATE) | Substrate reference terminal | Must be connected to lowest potential point in circuit (typically GND or negative rail); reference for 1.2 V comparator. |
| 5 (GND) | Power ground | Return path for internal logic and current-sense circuitry; separate from SUBSTRATE but typically tied together. |
| 6 (CATHODE) | Integrated Schottky diode cathode | Connected internally to collector of NPN switch; used as catch diode in boost/inverting topologies. |
| 7 (ANODE) | Integrated Schottky diode anode | Internally tied to emitter of NPN switch; completes diode path for inductive energy recirculation. |
| 8 (VCC) | Supply input | 4.5 V–12 V operating range; powers internal logic, oscillator, and base drive; also feeds current-limit sense network. |
| 9 (CUR LIM SENS) | Current limit sense input | Monitors voltage across external RCL; trips at 0.7 V to protect switch and inductor from saturation/overstress. |
| 10 (BASE DRIVE) | Test-only base driver | No functional role in application circuits; reserved for factory testing only - leave unconnected. |
| 11 (BASE) | Test-only base terminal | No functional role in application circuits; reserved for factory testing only - leave unconnected. |
| 12 (COL OUT) | NPN collector output | Uncommitted collector node; connects to inductor in boost, to input in buck, or to ground in inverting configuration. |
| 13 (NC) | No internal connection | Physically present pin with no die bond - must remain floating; no pull-up/down or routing required. |
| 14 (EMIT OUT) | NPN emitter output | Uncommitted emitter node; ties to GND in boost, to output in buck, or to input in inverting configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Topology flexibility | Single IC supports buck, boost, and inverting regulators - reduces BOM count and simplifies design reuse across multiple rail requirements. |
| Adjustable output voltage | Set via external R1/R2 divider referenced to 1.2 V - enables precise output tuning (e.g., 3.3 V, 5 V, ±12 V) without changing IC. |
| Integrated current limiting | Programmable trip point (0.7 V across RCL) - protects external inductor and internal switch under overload or short-circuit conditions. |
| TTL-compatible inhibit | Digital ON/OFF control with 2.5 V VIH min - allows direct interfacing with MCU GPIOs or logic-level sequencers without level-shifting. |
| Fixed-on-time architecture | On-time independent of input voltage due to proportional current/threshold scaling - improves transient response and stability across line variation. |
Applications
| Portable Medical Sensors | Industrial Data Acquisition Modules |
|---|---|
Use Scenario: Powering low-noise analog front-ends (e.g., strain gauge amplifiers, thermocouple conditioners) in battery-operated handheld diagnostic tools. IC Role / Device Role / Timing Role: TL497ACDR acts as a step-up controller generating stable +5 V or +12 V from a 3.6 V Li-ion cell, using external inductor and diode. Use Value: Achieves ≥60% efficiency at light loads and tight output regulation (0.4% typ), minimizing thermal rise and extending battery life while maintaining ADC reference stability. |
Use Scenario: Generating isolated or non-isolated auxiliary rails (e.g., ±15 V op-amp supplies, +3.3 V microcontroller core) in modular PLC I/O cards. IC Role / Device Role / Timing Role: TL497ACDR operates in inverting mode to produce −12 V from +12 V bus, leveraging its integrated Schottky diode and current-limited switch. Use Value: Eliminates need for external high-voltage diode and discrete transistor, reducing component count and board area while maintaining 0.2% input regulation against bus fluctuations. |
| Automated Test Equipment (ATE) Power Supplies | Smart Sensor Transmitters |
Use Scenario: Providing programmable, low-ripple bias voltages for DUT interface circuitry in benchtop multimeters and signal sources. IC Role / Device Role / Timing Role: TL497ACDR configured in step-down mode regulates +3.3 V from +5 V USB-derived input, with soft-start preventing measurement glitches during power-up. Use Value: Soft start eliminates output overshoot, and 500 mA switch current supports simultaneous powering of DACs, op-amps, and level-shifters without external boost. |
Use Scenario: Converting 24 V loop power to regulated +5 V and −5 V rails inside HART-enabled 4–20 mA field transmitters. IC Role / Device Role / Timing Role: TL497ACDR serves dual roles: one in buck mode for +5 V, another in inverting mode for −5 V - both sharing same VCC and timing components. Use Value: Dual-rail generation from single IC reduces layout complexity and improves thermal coupling between complementary rails, aiding common-mode noise rejection. |
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 NPN transistor; no integrated diode or substrate reference. | Less flexible topology support (boost-only); lacks inverting/buck capability and soft-start. | Choose LM2577-ADJ only when fixed frequency and higher power (>500 mA) are required, and topology is strictly boost. |
| TPS54202D | Synchronous buck controller (2 A), integrated high/low-side MOSFET drivers; no boost/inverting support. | Only supports buck topology; optimized for high-efficiency, high-current DC-DC with external FETs. | Choose TPS54202D when designing >1 A buck converters where synchronous rectification and smaller inductors are prioritized. |
Compared with LM2577-ADJ and TPS54202D, the TL497ACDR uniquely combines topology versatility (buck/boost/invert), integrated switch + diode, and substrate-referenced 1.2 V reference - making it optimal for space-constrained, multi-rail, low-to-moderate power designs where flexibility outweighs raw current or frequency specs.
Availability
TL497ACDR is available at Aetrix Electronics and suitable for portable instrumentation, industrial data acquisition modules, and automated test equipment requiring stable component supply with commercial-temperature qualification and long-term manufacturability.
Supply support for TL497ACDR 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 decades of expertise in high-reliability control ICs.
The TL497ACDR belongs to TI's legacy switching regulator controller product line, designed specifically for cost-sensitive, topology-flexible DC-DC conversion in commercial-grade instrumentation and industrial subsystems.
FAQ
What is the maximum input voltage the TL497ACDR can handle?
The TL497ACDR has an absolute maximum supply voltage (VCC) rating of 15 V. Its recommended operating range is 4.5 V to 12 V. Exceeding 12 V during normal operation risks violating recommended conditions, though brief transients up to 15 V are tolerated per absolute maximum ratings. For inputs above 12 V, TI recommends using the extended-input configuration shown in Figure 4 of the datasheet, which adds an external transistor to shift the effective input range.
Does the TL497ACDR require an external diode in all configurations?
No - the TL497ACDR integrates a matched Schottky diode (anode at Pin 7, cathode at Pin 6), eliminating the need for an external diode in standard boost and inverting configurations. However, TI's datasheet explicitly states that "an external catch diode, e.g., 1N4001, should be used when building an inverting supply," indicating the internal diode is not rated for reverse recovery in that mode. In buck configurations, the internal diode is unused and an external freewheeling diode is always required.
Can the TL497ACDR be used in synchronous rectification mode?
No - the TL497ACDR does not support synchronous rectification. It drives only a single NPN transistor (via COL OUT and EMIT OUT) and relies on either its internal Schottky diode or an external diode for freewheeling. There is no second gate driver output, no dead-time control, and no provision for driving a synchronous MOSFET. Designs requiring >85% efficiency at moderate loads should consider modern synchronous buck controllers instead.
What is the purpose of the SUBSTRATE (Pin 4) connection, and how should it be wired?
PIN 4 (SUBSTRATE) is the reference node for the 1.2 V internal comparator and must be connected to the most negative potential in the circuit - typically system ground in positive-output configurations, or the negative rail in inverting setups. It is not interchangeable with GND (Pin 5), though they are often tied together. Incorrect SUBSTRATE connection causes comparator malfunction and loss of regulation. The datasheet emphasizes this distinction in Figures 1–3 and electrical characteristics tables.
How is output voltage adjusted on the TL497ACDR?
Output voltage is adjusted using an external resistor divider (R1 and R2) connected between output and ground, with the junction feeding COMP INPUT (Pin 1). The TL497ACDR's internal 1.2 V reference (vs. SUBSTRATE) is compared to this feedback voltage. The formula is VO = 1.2 V × (1 + R1/R2), where R2 is fixed at 1.2 kΩ in TI reference designs. This method applies identically across buck, boost, and inverting topologies per Figures 1–3.
TL497ACDR 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
TL497ACDR FAQ
1.How can I place an order for TL497ACDR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL497ACDR 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 TL497ACDR reliable?
The price and inventory of TL497ACDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL497ACDR is usually 5 days.
3.What payment methods are accepted for TL497ACDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL497ACDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL497ACDR?
TL497ACDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL497ACDR 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 TL497ACDR?
For technical support, including TL497ACDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL497ACDR requirements.
6.How does Aetrix verify that TL497ACDR is sourced from the original manufacturer or authorized distributors?
All TL497ACDR 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 TL497ACDR meets industry standards.
7.What is the process for return or replacement of TL497ACDR?
All TL497ACDR units undergo pre-shipment inspection (PSI). If there is an issue with TL497ACDR, 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 TL497ACDR part is unused and in its original packaging.
Return procedure for TL497ACDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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