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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Texas Instruments TL497AID

Name: TL497AID
Brand: Texas Instruments
SKU: TL497AID
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TL497AID

Manufacturer:: Texas Instruments

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 14-SOIC (0.154", 3.90mm Width)

Datasheet:: TL497AID.pdf

Description:: IC REG BUCK BST ADJ 500MA 14SOIC

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Product details

Overview

TL497AID from Texas Instruments is a fixed-on-time, variable-frequency switching voltage regulator controller IC designed for buck, boost, and inverting DC-DC conversion. It integrates an internal 500 mA NPN power switch, 1.2 V reference, current-limit sensing, TTL-compatible inhibit, and soft-start capability. It operates from 4.5 V to 12 V input and supports output regulation within ±0.4% typical across industrial temperature range (−40°C to 85°C).

For engineers reviewing the TL497AID datasheet, TL497AID pinout, TL497AID application, or TL497AID equivalent, this page delivers verified technical context, validated pin functions, real-world configuration guidance for step-up/step-down/inverting topologies, and selection-critical comparisons with functionally aligned alternatives.

Technical Context

The TL497AID implements a fixed-on-time control architecture where switch conduction duration is set by an external timing capacitor (CT) charged by an internal constant-current source proportional to VCC-ensuring stable on-time across 4.5–12 V supply variation. Its oscillator drives an uncommitted NPN transistor (COL OUT/EMIT OUT) capable of 500 mA peak switching current, with integrated Schottky diode (CATHODE/ANODE) for commutation.

Feedback regulation uses a high-gain comparator comparing resistor-divider voltage at COMP INPUT against a 1.2 V substrate-referenced reference. Current limiting is implemented via CUR LIM SENS pin, triggering at 0.7 V across external RCL. INHIBIT provides TTL-level shutdown, and SUBSTRATE serves as the internal reference node-not ground.

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 oscillator.
Peak Switch Current	500 mA - maximum sustainable collector current through internal NPN transistor without current-limit activation.
Reference Voltage	1.2 V (substrate-referenced) - sets feedback threshold for output voltage regulation via R1/R2 divider.
Output Regulation	0.4% typical - precision of regulated output under line/load changes, critical for stable analog or logic supply rails.
Operating Temperature	−40°C to 85°C - qualified industrial-grade thermal range enabling use in automotive body electronics and industrial controls.
Switch On-State Voltage	0.85 V at 500 mA - forward V_CE(sat) impacting conduction loss and efficiency in high-current configurations.
Input Current Limit Threshold	0.7 V across RCL - determines peak inductor current via RCL = 0.5 V / I_PK, protecting against saturation and transistor overstress.

Pinout & Package

TL497AID is housed in a 14-pin SOIC (D) package, 3.90 mm wide, 8.65 mm long, 1.75 mm max height, with 1.27 mm pitch and RoHS-compliant NiPdAu lead finish. Pin 1 index area located at top-left corner; device marked "TL497AI".

Pin/Terminal	Circuit Role	Design Meaning
1 (COMP INPUT)	Feedback comparator input	Connects to resistor divider output; comparator triggers oscillator when voltage falls below 1.2 V reference.
2 (INHIBIT)	TTL-compatible enable/disable control	High = oscillator disabled, output off; low = normal operation; 2.5 V min VIH ensures compatibility with 5 V logic.
3 (FREQ CONTROL)	Timing capacitor connection	CT pin charges internally to set fixed on-time; CT value directly determines switching frequency (e.g., 500 pF → 44 µs on-time).
4 (SUBSTRATE)	Internal reference node	Not ground-serves as 1.2 V reference return; must be connected to system ground only if no substrate isolation required.
5 (GND)	Power ground reference	Analog and power ground return for internal circuitry; separate from SUBSTRATE but typically tied externally.
6 (CATHODE)	Integrated Schottky diode cathode	Used in boost/inverting configurations for freewheeling path; rated for 500 mA forward current and 35 V reverse blocking.
7 (ANODE)	Integrated Schottky diode anode	Completes internal diode path; connects to emitter of internal transistor in standard boost layout.
8 (VCC)	Positive supply input	Primary power rail (4.5–12 V); powers internal bias, oscillator, and base drive; also feeds current-limit sense network.
9 (CUR LIM SENS)	Current limit sense input	Monitors voltage drop across RCL; comparator trips when ≥0.7 V, disabling switch to protect inductor and transistor.
10 (BASE DRIVE)	Test-only base drive signal	No functional role in application circuits; reserved for factory testing-leave unconnected in designs.
11 (BASE)	Test-only base terminal	No functional role in application circuits; reserved for factory testing-leave unconnected in designs.
12 (COL OUT)	Internal NPN collector output	Switching node for inductor connection in boost; connects to input in buck; requires external catch diode in inverting mode.
13 (EMIT OUT)	Internal NPN emitter output	Emitter node of internal transistor; tied to GND in boost, to input in buck, or to output in inverting configurations.
14 (NC)	No internal connection	Unbonded pad-no electrical function; may be left floating or grounded per PCB layout best practices.

Key Features

Feature	Design Value
Configurable topology support	Enables step-up (boost), step-down (buck), and inverting regulator designs using same IC-reduces BOM count and design reuse effort.
Adjustable output voltage	Set via external R1/R2 resistor divider referenced to 1.2 V internal reference-supports outputs from 1.2 V up to 30 V (boost) or −25 V (inverting).
Soft start-up capability	Gradual ramp of output voltage during power-up-prevents inrush current, reduces stress on input capacitors and downstream loads.
Input current limit protection	Programmable peak current limit via RCL resistor-prevents inductor saturation and transistor thermal runaway under overload or short-circuit.
TTL-compatible inhibit	Digital ON/OFF control with 2.5 V VIH threshold-enables direct interface with microcontrollers, FPGAs, or logic sequencers without level-shifting.

Applications

Industrial Power Supplies	Automotive Body Control Modules
Use Scenario: Generating isolated 12 V or 5 V rails from 24 V vehicle battery in BCMs with space constraints and thermal limitations. IC Role / Device Role / Timing Role: TL497AID acts as primary switching controller driving external inductor/diode; its fixed-on-time architecture maintains regulation despite wide input transients (e.g., load dump). Use Value: −40°C to 85°C rating ensures reliability across engine bay temperatures; integrated current limit protects against motor stall faults.	Use Scenario: Converting 12 V battery to stable 5 V for microcontroller, CAN transceiver, and sensor interfaces in door modules or lighting controllers. IC Role / Device Role / Timing Role: TL497AID configured in buck mode provides regulated 5 V output; INHIBIT enables sleep-mode power gating synchronized with vehicle wake-up signals. Use Value: Soft start prevents brown-out during ignition; 500 mA switch current supports multiple peripherals without external driver.
Portable Medical Instrumentation	Industrial Sensor Signal Conditioning
Use Scenario: Powering analog front-end (AFE) and ADC in handheld diagnostic devices requiring low-noise, stable 3.3 V from single Li-ion cell (3.0–4.2 V). IC Role / Device Role / Timing Role: TL497AID used in boost configuration with low-ESR ceramic output capacitor; SUBSTRATE pin tied to clean analog ground to minimize reference noise coupling. Use Value: 0.4% output regulation preserves measurement accuracy; adjustable feedback allows precise 3.3 V setting independent of battery voltage sag.	Use Scenario: Providing isolated ±15 V rails for op-amp-based signal conditioning in PLC I/O modules powered from 24 V DC bus. IC Role / Device Role / Timing Role: TL497AID configured in inverting topology generates −15 V; external 1N4001 catch diode complements internal Schottky for higher reverse voltage handling. Use Value: Fixed-on-time control ensures consistent regulation across varying 24 V input ripple; current limit protects against sensor short-circuit events.

Industrial Power Supplies

Automotive Body Control Modules

Use Scenario: Generating isolated 12 V or 5 V rails from 24 V vehicle battery in BCMs with space constraints and thermal limitations.

IC Role / Device Role / Timing Role: TL497AID acts as primary switching controller driving external inductor/diode; its fixed-on-time architecture maintains regulation despite wide input transients (e.g., load dump).

Use Value: −40°C to 85°C rating ensures reliability across engine bay temperatures; integrated current limit protects against motor stall faults.

Use Scenario: Converting 12 V battery to stable 5 V for microcontroller, CAN transceiver, and sensor interfaces in door modules or lighting controllers.

IC Role / Device Role / Timing Role: TL497AID configured in buck mode provides regulated 5 V output; INHIBIT enables sleep-mode power gating synchronized with vehicle wake-up signals.

Use Value: Soft start prevents brown-out during ignition; 500 mA switch current supports multiple peripherals without external driver.

Portable Medical Instrumentation

Industrial Sensor Signal Conditioning

Use Scenario: Powering analog front-end (AFE) and ADC in handheld diagnostic devices requiring low-noise, stable 3.3 V from single Li-ion cell (3.0–4.2 V).

IC Role / Device Role / Timing Role: TL497AID used in boost configuration with low-ESR ceramic output capacitor; SUBSTRATE pin tied to clean analog ground to minimize reference noise coupling.

Use Value: 0.4% output regulation preserves measurement accuracy; adjustable feedback allows precise 3.3 V setting independent of battery voltage sag.

Use Scenario: Providing isolated ±15 V rails for op-amp-based signal conditioning in PLC I/O modules powered from 24 V DC bus.

IC Role / Device Role / Timing Role: TL497AID configured in inverting topology generates −15 V; external 1N4001 catch diode complements internal Schottky for higher reverse voltage handling.

Use Value: Fixed-on-time control ensures consistent regulation across varying 24 V input ripple; current limit protects against sensor short-circuit events.

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), external MOSFET drive, no integrated switch; requires external N-channel MOSFET and bootstrap circuit.	Better suited for >1 A output currents; lacks internal switch and Schottky diode-needs more external components than TL497AID.	Choose LM2577-ADJ when higher output current (>750 mA) or lower quiescent current (<5 mA) is required; not drop-in compatible.
MC34063AP	Fixed-frequency (100 kHz), internal bipolar switch (1.5 A), no integrated Schottky; wider input range (3–40 V), but less precise reference (2.5 V ±2%).	Supports wider input voltages and higher peak currents; lacks soft-start and TTL inhibit-requires external RC networks for enable and startup control.	Choose MC34063AP for cost-sensitive, high-input-voltage (>12 V) applications where 500 mA switch current is insufficient; pinout and feedback differ.

Compared with LM2577-ADJ and MC34063AP, TL497AID offers integrated 500 mA switch and Schottky diode in a single SOIC-14 package, simplifying buck/boost/inverting designs for ≤500 mA loads while delivering tighter 1.2 V reference and built-in soft-start-ideal for compact industrial and automotive subsystems.

Availability

TL497AID is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, portable medical instrumentation, and sensor signal conditioning requiring stable component supply across extended temperature ranges.

Supply support for TL497AID 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 power conversion ICs.

The TL497AID belongs to TI's legacy switching regulator controller family, engineered for simplicity and robustness in non-isolated DC-DC conversion-targeting cost-sensitive, thermally constrained applications where minimal external components and industrial temperature operation are essential.

FAQ

What is the maximum output current achievable with TL497AID in boost configuration?

The TL497AID supports up to 500 mA peak switch current in boost mode when using the internal NPN transistor. Continuous output current depends on duty cycle, inductor size, and thermal management-but typically reaches 300–400 mA with proper layout and airflow. Exceeding 500 mA triggers current-limit protection. For higher currents, the TL497AID can drive an external transistor in extended-power configurations as shown in Figures 1–3 of the datasheet.

Can TL497AID operate with input voltage below 4.5 V?

No-TL497AID has a specified minimum supply voltage of 4.5 V per recommended operating conditions. Operation below this threshold risks improper oscillator startup, unstable reference voltage, and unreliable current-limit activation. The internal 1.2 V reference and comparator require sufficient headroom; attempting sub-4.5 V operation may result in erratic regulation or complete failure to switch.

How is output voltage adjusted on TL497AID?

Output voltage is set using a resistor divider (R1 and R2) from output to GND, with the junction connected to COMP INPUT (Pin 1). The internal 1.2 V reference is compared to this divided voltage. Using R2 = 1.2 kΩ as standard, R1 = (V_OUT − 1.2 V) × 1 kΩ gives the required value-for example, 5 V output requires R1 ≈ 3.8 kΩ. Precision metal-film resistors improve regulation accuracy.

What is the purpose of the SUBSTRATE pin (Pin 4) on TL497AID?

SUBSTRATE (Pin 4) is the internal reference node for the 1.2 V comparator and must be connected to system ground in most applications. Unlike GND (Pin 5), which serves as power return, SUBSTRATE establishes the reference potential for the bandgap circuit. Leaving it floating causes regulation failure; tying it directly to GND ensures accurate feedback comparison and stable output voltage.

Does TL497AID require an external catch diode in all configurations?

No-TL497AID includes an integrated Schottky diode (CATHODE/ANODE pins) usable in boost and buck configurations. However, in inverting mode, TI explicitly recommends an external catch diode (e.g., 1N4001) due to higher reverse voltage requirements beyond the internal diode's 35 V rating. Always verify diode voltage/current ratings against worst-case transient conditions in final design.

TL497AID Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 14-SOIC (0.154", 3.90mm Width)

Packaging:: Bulk

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

TL497AID FAQ

1.How can I place an order for TL497AID through Aetrix?

Please submit a Request for Quotation (RFQ) for TL497AID 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 TL497AID reliable?

The price and inventory of TL497AID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL497AID is usually 5 days.

3.What payment methods are accepted for TL497AID?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL497AID transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TL497AID?

TL497AID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TL497AID 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 TL497AID?

For technical support, including TL497AID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL497AID requirements.

6.How does Aetrix verify that TL497AID is sourced from the original manufacturer or authorized distributors?

All TL497AID 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 TL497AID meets industry standards.

7.What is the process for return or replacement of TL497AID?

All TL497AID units undergo pre-shipment inspection (PSI). If there is an issue with TL497AID, 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 TL497AID part is unused and in its original packaging.

Return procedure for TL497AID:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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