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Texas Instruments TL497ACPWR
- Part No.:
- TL497ACPWR
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TL497ACPWR.pdf
- Description:
- IC REG BCK BST ADJ 500MA 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,027
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Product details
Overview
TL497ACPWR 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 adjustable output voltage in industrial power supplies requiring >60% efficiency.
For engineers reviewing the TL497ACPWR datasheet, TL497ACPWR pinout, TL497ACPWR application, or TL497ACPWR equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives with functional distinctions, and supply-chain support details specific to the TSSOP-14 package variant.
Technical Context
The TL497ACPWR 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 input range. Its high-gain comparator compares feedback voltage against a 1.2 V (substrate-referenced) reference to regulate output.
It features uncommitted collector/emitter terminals enabling direct use of the internal NPN transistor (500 mA peak) or external transistor drive via BASE DRIVE/BASE pins (test-only), plus integrated Schottky diode for commutation. Current limiting is implemented via a 0.7 V threshold across RCL, and INHIBIT provides TTL-level shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4.5 V to 12 V - Supports standard 5 V and 9 V rails; absolute max 15 V prevents damage during transient overvoltage. |
| Switch Peak Current | 500 mA - Enables direct driving of small inductors in low-to-mid power converters without external pass devices. |
| Reference Voltage | 1.2 V (vs. substrate) - Sets output regulation point; used with R1/R2 divider to configure output from ~1.2 V up to 30 V (boost) or −25 V (inverting). |
| Input Regulation | 0.2% typical - Minimizes output drift due to input voltage variation, critical for battery-powered systems with wide discharge curves. |
| Output Regulation | 0.4% typical - Ensures tight load regulation under dynamic current changes, supporting stable analog or logic rail generation. |
| Soft Start-Up | Internal circuitry - Prevents inrush current and output overshoot during power-up, eliminating need for external RC soft-start networks. |
| Inhibit Input Logic | TTL-compatible - Allows direct interfacing with microcontrollers or logic gates without level-shifting; high = output disabled. |
Pinout & Package
TSSOP-14 package (PW), 5.0 mm × 4.4 mm × 1.2 mm max height, lead pitch 0.65 mm, RoHS-compliant NiPdAu 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 cycle when below threshold. |
| 2 (INHIBIT) | Enable/disable control | Active-high TTL input; drives internal oscillator and switch off when high, reducing quiescent current to ≤11 mA. |
| 3 (FREQ CONTROL) | Timing capacitor connection | Connects external CT (200–2000 pF); sets fixed on-time (19–180 µs) via internal current source proportional to VCC. |
| 4 (SUBSTRATE) | Reference node for 1.2 V reference | Must be connected to system ground or lowest potential point; reference voltage is measured relative to this pin, not GND. |
| 5 (GND) | Power ground | Return path for internal bias currents and sense circuits; separate from SUBSTRATE to avoid noise coupling into reference. |
| 6 (CATHODE) | Integrated Schottky diode cathode | Used in boost/inverting topologies as catch diode anode connection point; rated for 500 mA forward current. |
| 7 (ANODE) | Integrated Schottky diode anode | Connected internally to emitter of NPN switch; enables synchronous rectification or freewheeling path without external diode. |
| 8 (VCC) | Supply input | Primary power input (4.5–12 V); powers all internal circuits and provides current for RCL-based current limit sensing. |
| 9 (CUR LIM SENS) | Current limit sense input | Monitors voltage across RCL; triggers current limit when ≥0.7 V, protecting inductor and internal transistor from saturation/overstress. |
| 10 (BASE DRIVE) | Test-only base drive signal | Not intended for circuit use; used during wafer test to force transistor operation; leave unconnected in application. |
| 11 (BASE) | Test-only base terminal | Not intended for circuit use; used during wafer test; no functional role in normal operation. |
| 12 (COL OUT) | Collector of internal NPN switch | Main high-side switching node; connects to inductor in boost, to input in buck, or to ground in inverting configuration. |
| 13 (NC) | No internal connection | Unbonded pad; electrically isolated; must remain floating or tied to GND per layout best practice to reduce noise coupling. |
| 14 (EMIT OUT) | Emitter of internal NPN switch | Low-side return for internal switch; connects to GND in boost, to output in buck, or to input in inverting configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Triple topology support | Configurable as step-up (boost), step-down (buck), or polarity-inverting regulator using same IC and minimal external components. |
| Adjustable output voltage | Set via two-resistor feedback network (R1/R2); supports outputs from 1.2 V to 30 V (boost) or −25 V (inverting) with 1.2 V reference. |
| Integrated current limit | Programmable via single RCL resistor; trips at 0.7 V drop, enabling precise peak current control without external op-amps or comparators. |
| Internal Schottky diode | Matched to internal transistor characteristics; eliminates need for external catch diode in many boost/inverting designs, saving board space and BOM cost. |
| Fixed-on-time control | Provides inherent line regulation and stable switching frequency vs. input voltage; simplifies loop compensation vs. voltage-mode controllers. |
Applications
| Portable Medical Instrument Power | Industrial Sensor Node Supply |
|---|---|
Use Scenario: Generating stable ±5 V rails from a single 3.7 V Li-ion cell in handheld diagnostic devices. IC Role / Device Role / Timing Role: TL497ACPWR operates in inverting configuration to produce −5 V, while a second instance in boost mode generates +5 V. Use Value: Eliminates need for dual-output isolated DC-DC modules; achieves >60% efficiency at 100 mA load with only six external components per rail. |
Use Scenario: Powering 3.3 V microcontroller, RS-485 transceiver, and analog front-end from a 12 V industrial bus with wide input tolerance. IC Role / Device Role / Timing Role: TL497ACPWR configured as buck regulator steps 12 V down to 3.3 V with adjustable output and soft start. Use Value: Input regulation of 0.2% ensures consistent 3.3 V output despite bus fluctuations; 500 mA switch handles peak MCU + sensor loads without derating. |
| Automotive Aftermarket Display Backlight | Legacy Equipment Voltage Translation |
Use Scenario: Driving white LED strings requiring 24 V from a 12 V vehicle battery in infotainment displays. IC Role / Device Role / Timing Role: TL497ACPWR in boost configuration controls inductor current and regulates 24 V output with current limit protection. Use Value: Integrated 500 mA switch and Schottky diode simplify layout; 0.4% output regulation maintains consistent LED brightness across temperature. |
Use Scenario: Replacing obsolete 78L05 linear regulators in aging test equipment needing 5 V from 9 V wall adapters. IC Role / Device Role / Timing Role: TL497ACPWR replaces linear regulator in step-down configuration, reducing thermal load and improving efficiency. Use Value: Achieves >80% efficiency vs. <45% for linear solution at 100 mA, eliminating heatsinks and enabling compact rework of legacy PCBs. |
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), higher peak current (3 A), requires external diode; no integrated Schottky or substrate-referenced reference. | Better suited for higher-power (>500 mA) boost applications; lacks inverting capability and soft-start; needs more external components. | Select LM2577-ADJ when output current exceeds 500 mA or fixed switching frequency is required for EMI control. |
| TPS61040DRVR | Current-mode boost controller (500 kHz), 28 V max output, integrated 0.5 Ω FET, no inverting/buck modes; reference is 1.24 V (VDD-referenced). | Optimized for compact, high-frequency boost only; cannot replace TL497ACPWR in buck or inverting topologies or where substrate-referenced feedback is needed. | Choose TPS61040DRVR for space-constrained, high-efficiency boost-only designs with >1 MHz switching and lower quiescent current. |
Compared with LM2577-ADJ and TPS61040DRVR, the TL497ACPWR uniquely supports buck, boost, and inverting configurations with a single IC, leverages substrate-referenced feedback for improved noise immunity, and integrates both switch and Schottky diode-reducing component count and layout complexity in multi-rail or legacy-replacement designs.
Availability
TL497ACPWR is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial sensor nodes, automotive display backlighting, and legacy equipment voltage translation requiring stable component supply and long-term manufacturability.
Supply support for TL497ACPWR 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 precision analog ICs and power conversion solutions.
The TL497A product line was designed to provide flexible, low-component-count switching regulator control for cost-sensitive and space-constrained applications across industrial, medical, and automotive sectors-emphasizing topology versatility and ease of implementation.
FAQ
What is the operating temperature range for the TL497ACPWR?
The TL497ACPWR is characterized for operation from 0°C to 70°C ambient temperature. This commercial-grade rating aligns with its TL497AC suffix and is validated per the SLVS009F datasheet. The device uses thermal metrics including θJA = 113°C/W (TSSOP-PW package) to ensure reliable performance within this range under specified load and airflow conditions. TL497ACPWR must not be operated outside this range without derating analysis.
Can the TL497ACPWR be used in a buck (step-down) configuration?
Yes, the TL497ACPWR supports buck configuration as explicitly shown in Figure 2 of the SLVS009F datasheet. In this mode, COL OUT connects to input voltage, EMIT OUT connects to output, and the inductor bridges between them. Output voltage is regulated via the COMP INPUT feedback network, with minimum output limited to Vref (1.2 V) and maximum to VI − 1 V per recommended operating conditions.
What is the purpose of the SUBSTRATE pin on the TL497ACPWR?
The SUBSTRATE pin on the TL497ACPWR serves as the reference node for the internal 1.2 V comparator reference voltage. Unlike standard ground-referenced references, this voltage is defined relative to SUBSTRATE-not GND-so it must be connected to the lowest potential point in the circuit (typically system ground) to ensure accurate regulation. Misconnection causes output voltage error or instability.
Does the TL497ACPWR require an external catch diode in boost configuration?
No, the TL497ACPWR does not require an external catch diode in basic boost configuration because it integrates a matched Schottky diode between ANODE and CATHODE pins. This internal diode handles freewheeling current during switch-off periods. However, external diodes may still be added for higher current or reliability margin beyond the 500 mA rating.
How is current limiting set on the TL497ACPWR?
Current limiting on the TL497ACPWR is set by a single external resistor RCL connected between VCC and CUR LIM SENS. The internal circuit trips when 0.7 V is developed across RCL, so RCL = 0.7 V / IPK. For example, to limit peak switch current to 400 mA, RCL = 0.7 V / 0.4 A = 1.75 Ω. This threshold is specified in electrical characteristics and remains stable across temperature.
TL497ACPWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm 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-TSSOP
TL497ACPWR FAQ
1.How can I place an order for TL497ACPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL497ACPWR 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 TL497ACPWR reliable?
The price and inventory of TL497ACPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL497ACPWR is usually 5 days.
3.What payment methods are accepted for TL497ACPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL497ACPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL497ACPWR?
TL497ACPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL497ACPWR 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 TL497ACPWR?
For technical support, including TL497ACPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL497ACPWR requirements.
6.How does Aetrix verify that TL497ACPWR is sourced from the original manufacturer or authorized distributors?
All TL497ACPWR 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 TL497ACPWR meets industry standards.
7.What is the process for return or replacement of TL497ACPWR?
All TL497ACPWR units undergo pre-shipment inspection (PSI). If there is an issue with TL497ACPWR, 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 TL497ACPWR part is unused and in its original packaging.
Return procedure for TL497ACPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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