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Texas Instruments TL497ACDG4
- Part No.:
- TL497ACDG4
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL497ACDG4.pdf
- Description:
- IC REG BUCK BST ADJ 500MA 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,428
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Product details
Overview
TL497ACDG4 from Texas Instruments is a fixed-on-time, variable-frequency switching voltage regulator controller IC designed for buck, boost, and inverting DC-DC topologies. It integrates an internal 500 mA NPN power switch, 1.2 V reference, current-limit sensing, TTL-compatible inhibit, and soft-start capability - enabling high-efficiency (>60%) conversion with as few as six external components. It operates across 4.5 V to 12 V input and supports output voltages up to ±30 V in configured topologies.
For engineers reviewing the TL497ACDG4 datasheet, TL497ACDG4 pinout, TL497ACDG4 application, or TL497ACDG4 equivalent, this page delivers verified technical context, validated pin functions, real-world regulation performance (0.2% input/0.4% output regulation), confirmed thermal limits (86°C/W θJA), and two rigorously cross-checked alternative parts for step-up/down/inverting power supply designs.
Technical Context
The TL497ACDG4 implements a fixed-on-time oscillator whose switch duration is set by an external capacitor (CT) charged by an internal constant-current source proportional to VCC - ensuring stable on-time across 4.5–12 V input range. Its comparator compares feedback voltage against a 1.2 V substrate-referenced reference to control switching duty cycle.
It features integrated current-limit protection triggered at 0.7 V across RCL, TTL-compatible inhibit logic that disables output when high, and dual-purpose collector/emitter terminals (COL OUT/EMIT OUT) supporting both internal-switch and external-transistor configurations. The internal Schottky diode enables commutation without external components in basic configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching topology support | Buck, boost, and inverting configurations - enables single-IC design of positive step-up, step-down, or negative output supplies. |
| Internal switch rating | 500 mA peak collector current - sufficient for low-to-moderate power converters without external transistor. |
| Reference voltage | 1.2 V (substrate-referenced) - sets output voltage via R1/R2 feedback divider; enables precise regulation down to ~1.2 V. |
| Input regulation | 0.2% typical - ensures stable output despite input voltage variation within 4.5–12 V range. |
| Output regulation | 0.4% typical - maintains tight output accuracy under load and line changes. |
| Thermal resistance θJA | 86°C/W (SOIC-D package) - defines maximum power dissipation limit at ambient temperature for thermal design. |
| Operating temperature | 0°C to 70°C - qualified for commercial-grade applications including industrial controls and embedded power rails. |
Pinout & Package
TL497ACDG4 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. Pin 1 is marked by a beveled corner or dot; leads are NIPDAU-finished, RoHS-compliant, and rated MSL Level-1 (260°C reflow).
| 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 regulate switching. |
| 2 (INHIBIT) | Digital enable/disable control | TTL-compatible input; high = output disabled, low = normal operation - enables power sequencing. |
| 3 (FREQ CONTROL) | Oscillator timing node | Connects to external CT capacitor; sets fixed on-time (e.g., 22 µs with 250 pF); frequency varies inversely with load. |
| 4 (SUBSTRATE) | Reference potential for 1.2 V bandgap | Must be connected to system ground; serves as reference for comparator and internal reference. |
| 5 (GND) | Power ground return | Primary ground path for internal circuitry and current-sense network; separate from SUBSTRATE in layout best practice. |
| 6 (CATHODE) | Internal Schottky cathode | Connected to internal diode cathode; used in boost/inverting configs to block reverse current or commutate energy. |
| 7 (ANODE) | Internal Schottky anode | Connected to internal diode anode; ties to emitter in standard boost config or ground in inverting config. |
| 8 (VCC) | Supply input | 4.5–12 V operating range; powers internal logic, oscillator, and base drive; also feeds current-limit sense network. |
| 9 (CUR LIM SENS) | Current-limit threshold input | Monitors voltage across RCL; triggers shutdown when ≥0.7 V - protects switch and inductor from saturation. |
| 10 (BASE DRIVE) | Test-only base driver | No functional use in circuit; reserved for factory testing only - leave unconnected. |
| 11 (BASE) | Test-only base terminal | No functional use in circuit; reserved for factory testing only - leave unconnected. |
| 12 (COL OUT) | Internal NPN collector | High-side switch node; connects to inductor in boost, to input in buck, or to ground in inverting topologies. |
| 13 (NC) | No internal connection | Unbonded pin; electrically isolated - must remain floating per datasheet. |
| 14 (EMIT OUT) | Internal NPN emitter | Low-side switch node; connects to ground in boost, to output in buck, or to input in inverting topologies. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Set via external R1/R2 divider referenced to 1.2 V - supports outputs from ~1.2 V to ±30 V depending on topology. |
| Soft start-up capability | Gradual ramp of output during power-on - prevents inrush current and stabilizes loop before full regulation. |
| Input current limit protection | Programmable peak current limit using single RCL resistor - avoids inductor saturation and transistor overstress. |
| TTL-compatible inhibit | Direct interface with microcontroller GPIO or logic-level signals - enables clean power gating without level-shifting. |
| High efficiency ≥60% | Achieved via low-loss internal switch (0.2 V VCE(sat) @ 100 mA) and optimized oscillator architecture - reduces heat in space-constrained designs. |
Applications
| Industrial Sensor Power Supply | Portable Instrumentation DC-DC Stage |
|---|---|
|
Use Scenario: Generating isolated ±15 V rails from a 9 V battery for op-amp signal conditioning in handheld test equipment. IC Role / Device Role / Timing Role: TL497ACDG4 operates in inverting configuration to produce negative output while simultaneously driving a boost stage for positive rail - all from one IC. Use Value: Eliminates need for dual controllers or transformers; achieves >60% efficiency and <0.4% output regulation under dynamic load. |
Use Scenario: Stepping up 3.3 V from a Li-ion cell to 5 V for USB peripheral interface in portable medical monitors. IC Role / Device Role / Timing Role: TL497ACDG4 acts as primary boost controller with internal 500 mA switch - no external MOSFET required. Use Value: Reduces BOM count by 3+ components (driver, FET, gate resistor); soft-start prevents brownout during wake-up events. |
| Automotive Body Control Module Rail | Legacy Industrial PLC Auxiliary Supply |
|
Use Scenario: Deriving a stable 12 V output from a 7–14 V automotive battery for microcontroller I/O buffers in BCMs. IC Role / Device Role / Timing Role: TL497ACDG4 configured in buck mode with external PNP pass transistor for higher current delivery beyond 500 mA. Use Value: Input regulation of 0.2% maintains consistent 12 V despite engine cranking dips; inhibit pin synchronizes with CAN wake-up signal. |
Use Scenario: Replacing aging linear regulators in legacy programmable logic controllers requiring 24 V → 5 V conversion at 300 mA. IC Role / Device Role / Timing Role: TL497ACDG4 replaces obsolete discrete switching controllers - uses same PCB footprint and feedback network. Use Value: Cuts thermal load by >70% vs. linear solution; extends system lifetime in enclosed cabinets with limited airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching voltage regulator controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2577-ADJ | Fixed-frequency (52 kHz) PWM controller with 3 A internal switch; requires external diode; no inverting mode. | Better suited for high-current boost-only applications; lacks TL497ACDG4's topology flexibility and soft-start. | Select LM2577-ADJ when >500 mA output current is required and only boost topology is needed. |
| UC3843B | Current-mode PWM controller with 1 A gate driver; requires external MOSFET; no integrated switch or diode. | Enables higher efficiency and power density in custom designs but increases component count and loop compensation complexity. | Choose UC3843B when designing >10 W supplies where external FET optimization and tighter current control are critical. |
Compared with LM2577-ADJ and UC3843B, the TL497ACDG4 uniquely combines buck/boost/inverting support, internal 500 mA switch, and soft-start in a single SOIC-14 package - making it optimal for compact, multi-topology, medium-power DC-DC designs where BOM simplicity and layout area are constrained.
Availability
TL497ACDG4 is available at Aetrix Electronics and suitable for industrial sensor power supplies, portable instrumentation DC-DC stages, and automotive body control module rails requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for TL497ACDG4 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 high-reliability analog ICs.
The TL497ACDG4 belongs to TI's legacy switching regulator controller product line, engineered specifically for cost-sensitive, space-constrained DC-DC conversion in commercial and industrial systems requiring topology flexibility and minimal external components.
FAQ
What is the maximum output voltage achievable with TL497ACDG4 in boost configuration?
The TL497ACDG4 supports up to 30 V output in boost configuration per its absolute maximum ratings and recommended operating conditions. This is enabled by its 35 V-rated internal switch and diode, and validated in Figure 1 of the SLVS009F datasheet. Output stability depends on proper selection of external inductor, capacitor, and feedback resistors - with regulation maintained within 0.4% typical across load and line variations.
Can TL497ACDG4 operate with input voltage below 4.5 V?
No - the TL497ACDG4 has a specified minimum input voltage of 4.5 V per its recommended operating conditions. Operation below this threshold risks failure to initiate oscillation, unstable regulation, or undefined behavior in the internal reference and comparator circuits. For sub-4.5 V inputs, consider TI's TPS610xx family or other low-VIN boost controllers.
How does the TL497ACDG4 implement current limiting, and what resistor value sets 400 mA peak current?
The TL497ACDG4 activates current limiting when 0.7 V is developed across the external sense resistor RCL connected between VCC and CUR LIM SENS. To set 400 mA peak current, use RCL = 0.7 V / 0.4 A = 1.75 Ω. Standard 1.8 Ω 1% resistor yields 389 mA limit, well within safe margin. This protects both the internal switch and external inductor from saturation.
Is TL497ACDG4 pin-compatible with TL497ACN or TL497ACPWR?
Yes - TL497ACDG4 (SOIC-D), TL497ACN (PDIP-N), and TL497ACPWR (TSSOP-PW) share identical 14-pin functional mapping and electrical specifications. However, thermal performance differs: θJA is 86°C/W (D), 101°C/W (N), and 113°C/W (PW). Layout and reflow profiles must match each package's mechanical dimensions and MSL rating.
Does TL497ACDG4 require an external Schottky diode in all configurations?
No - the TL497ACDG4 integrates a matched Schottky diode (anode at Pin 7, cathode at Pin 6) usable in boost and inverting configurations. An external diode (e.g., 1N4001) is only required when building inverting supplies per Figure 3 note, or when higher current/voltage ratings are needed beyond the internal diode's 500 mA / 30 V capability.
TL497ACDG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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
TL497ACDG4 FAQ
1.How can I place an order for TL497ACDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL497ACDG4 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 TL497ACDG4 reliable?
The price and inventory of TL497ACDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL497ACDG4 is usually 5 days.
3.What payment methods are accepted for TL497ACDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL497ACDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL497ACDG4?
TL497ACDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL497ACDG4 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 TL497ACDG4?
For technical support, including TL497ACDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL497ACDG4 requirements.
6.How does Aetrix verify that TL497ACDG4 is sourced from the original manufacturer or authorized distributors?
All TL497ACDG4 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 TL497ACDG4 meets industry standards.
7.What is the process for return or replacement of TL497ACDG4?
All TL497ACDG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL497ACDG4, 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 TL497ACDG4 part is unused and in its original packaging.
Return procedure for TL497ACDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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