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Texas Instruments TL499ACPS
- Part No.:
- TL499ACPS
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
TL499ACPS.pdf
- Description:
- IC REG BOOST ADJ 1A 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,840
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Product details
Overview
TL499ACPS from Texas Instruments is a wide-range dual-mode power-supply controller integrating internal series-pass and step-up switching regulator circuits. It delivers adjustable regulated output from 2.9 V to 30 V, supports 4.5–32 V series input and 1.1–10 V switching input, and provides up to 100 mA continuous output current. It enables backup power during AC-line failure in microprocessor memory systems.
For engineers reviewing the TL499ACPS datasheet, TL499ACPS pinout, TL499ACPS application, or TL499ACPS equivalent, key selection criteria include its dual-regulation architecture (series + boost), externally controlled switching current, no-external-rectifier operation, thermal performance in PS package (θJA = 95°C/W), and –20°C to 85°C industrial temperature rating.
Technical Context
The TL499ACPS implements a hybrid regulation architecture: one path operates as a linear series regulator using SERIES IN1 and OUTPUT pins, while the other functions as a step-up switching regulator using SW REG IN2, SW IN, and SW CURRENT CTRL. Startup blocking diode and integrated current-sense circuitry enable automatic mode transition between AC-line-powered and battery-backed operation.
Its reference voltage is internally trimmed to 1.26 V (±0.06 V) with <10 mV/V temperature drift, and output regulation relies on external resistor dividers for precise VO adjustment. The device uses internal power switch capable of 500 mA peak current, with external RCL resistor setting switching current limit - enabling design flexibility across input/output combinations per Tables 1–5.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage range | 2.9 V to 30 V - set by two external resistors; enables single IC to serve multiple rail requirements. |
| Series regulator input range | 4.5 V to 32 V - accepts unregulated DC after transformer/bridge rectification for primary power path. |
| Switching regulator input range | 1.1 V to 10 V - compatible with NiCd/NiMH/alkaline batteries for seamless backup operation. |
| Continuous output current | 100 mA - sufficient for SRAM retention, real-time clocks, and low-power microcontrollers during outage. |
| Reference voltage | 1.26 V ±0.06 V - high-precision internal bandgap reference ensures stable feedback across temperature. |
| Operating temperature | –20°C to 85°C - qualified for industrial environments without derating under recommended conditions. |
| Package thermal impedance | 95°C/W (PS SOIC-8) - defines maximum power dissipation limit at given ambient; requires heatsinking above ~300 mW. |
Pinout & Package
TL499ACPS is housed in an 8-pin plastic small-outline (SO) package (PS), RoHS-compliant, tape-and-reel packaged (TL499ACPSR). Dimensions: 4.9 mm × 3.9 mm × 1.75 mm, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SERIES IN1) | Linear regulator input | Primary DC input for series regulation; must be ≥ VO + dropout (1.8 V min) for linear mode operation. |
| 2 (REF) | Internal reference node | Connects to resistor divider midpoint; sets output via VREF = 1.26 V; sensitive to noise - bypass with 0.1 µF. |
| 3 (SW REG IN2) | Boost regulator input | Battery or low-voltage source input for switching mode; reverse-blocking diode required externally if shared source. |
| 4 (SW CURRENT CTRL) | Switching current limit | Current-sense node tied to RCL resistor; sets peak inductor current - determines max output power in boost mode. |
| 5 (OUTPUT) | Regulated output | Main power rail output; feeds load and feedback divider; requires ≥100 µF bulk capacitance for stability. |
| 6 (GND (PWR)) | Power ground | Common return for series regulator, reference, and output stage; separate from signal ground in mixed-layout designs. |
| 7 (SW IN) | Switching power input | Drives internal NPN switch; connects to inductor; current path during boost cycle - layout critical for EMI control. |
| 8 (GND) | Signal ground | Reference and feedback ground; should be star-connected to GND (PWR) near device to minimize offset errors. |
Key Features
| Feature | Design Value |
|---|---|
| Dual regulation architecture | Single IC performs both series linear and step-up switching regulation - eliminates need for separate backup controller IC. |
| No external rectifier required | Integrated blocking diode prevents backfeed from OUTPUT to SW REG IN2 - simplifies battery-backup path and reduces BOM count. |
| Externally programmable switching current | RCL resistor sets peak inductor current from 150 Ω to 1 kΩ - allows optimization of efficiency vs. size for specific VO/VIN combinations. |
| Voltage deviation ≤30 mV/V | Minimal output perturbation (<30 mV per volt) when transitioning between series and switching modes - preserves system stability during AC failure. |
| Industrial temperature grade | Specified from –20°C to 85°C - validated for use in telecom line cards, industrial PLCs, and embedded controllers without derating. |
Applications
| Microprocessor Memory Backup | Industrial Power Sequencing |
|---|---|
|
Use Scenario: Maintaining SRAM or RTC power during AC mains interruption in embedded controllers. IC Role / Device Role / Timing Role: Dual-mode regulator providing uninterrupted 5 V or 3.3 V rail from battery when main supply fails. Use Value: Eliminates need for discrete OR-ing diodes and separate boost IC - reduces footprint and improves reliability of backup path. |
Use Scenario: Generating sequenced auxiliary rails (e.g., 12 V → 5 V → 3.3 V) in programmable logic controllers. IC Role / Device Role / Timing Role: Primary regulator for intermediate rail; series mode supplies clean 5 V, switching mode handles brownout recovery. Use Value: Enables single-chip solution for fault-tolerant power where input voltage may dip below nominal during motor startup or surge events. |
| Telecom Line Card Power | Portable Test Equipment |
|
Use Scenario: Providing regulated 3.3 V or 5 V from –48 V telecom supply with local battery hold-up. IC Role / Device Role / Timing Role: Series regulator fed from isolated DC-DC converter; switching regulator engages during upstream converter fault. Use Value: Meets GR-63 short-term hold-up requirements (≥100 ms) using compact inductor/capacitor values per Table 1 (RCL = 150 Ω). |
Use Scenario: Powering analog front-end and MCU in handheld multimeters or signal generators with alkaline battery input. IC Role / Device Role / Timing Role: Step-up regulator converting 1.5 V × 2 AA cells to stable 3.3 V or 5 V; series mode unused or disabled. Use Value: Delivers >65 mA at 30 V output from 1.5 V input (RCL = 150 Ω), extending battery life versus fixed-output boost converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-mode power-supply controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576-ADJ | Fixed-frequency PWM buck controller only; no series regulator; requires external diode and transistor for boost. | Cannot provide seamless AC-failure switchover; lacks integrated linear path for low-noise output. | Choose LM2576-ADJ only when pure step-down is sufficient and backup capability is handled externally. |
| TPS61040 | High-efficiency 28-V boost converter with 0.5-A switch; no linear regulator; no dual-mode operation. | Higher efficiency (>85%) in boost-only use cases but cannot regulate from high-input sources like rectified AC. | Use TPS61040 where input is always low-voltage (≤6 V) and high-current boost is needed - not for AC/DC hybrid systems. |
Compared with TL499ACPS, LM2576-ADJ requires additional components for backup functionality and lacks integrated series regulation, while TPS61040 offers superior boost efficiency but no linear mode - making TL499ACPS uniquely suited for applications demanding automatic failover between AC-derived and battery-derived power with minimal external parts.
Availability
TL499ACPS is available at Aetrix Electronics and suitable for microprocessor memory backup, industrial PLC power, telecom line card hold-up, and portable test equipment requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for TL499ACPS 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 company founded in 1930, specializing in analog, embedded processing, and power management ICs with broad industrial and automotive portfolio coverage.
The TL499A family was designed specifically for wide-input-range, dual-mode power conversion in systems requiring uninterrupted operation during AC-line disturbances - targeting memory retention, instrumentation, and telecom infrastructure.
FAQ
What is the maximum output voltage achievable with TL499ACPS?
The TL499ACPS supports an adjustable regulated output voltage from 2.9 V to 30 V, set by external resistor divider connected to the REF pin. This range is guaranteed over the full –20°C to 85°C operating temperature range and applies directly to the TL499ACPS in both series and switching modes.
Can TL499ACPS operate solely in switching mode without using the series regulator?
Yes, TL499ACPS can operate exclusively in step-up switching mode by connecting only SW REG IN2, SW IN, SW CURRENT CTRL, OUTPUT, and grounds - leaving SERIES IN1 unconnected or tied to OUTPUT. The series regulator path remains inactive unless SERIES IN1 exceeds VO by ≥1.8 V, allowing flexible single-mode deployment.
What is the purpose of the two separate ground pins (GND and GND (PWR)) on TL499ACPS?
TL499ACPS separates signal ground (Pin 8) and power ground (Pin 6) to minimize noise coupling from switching currents into the precision reference and feedback circuitry. Pin 6 carries high pulsed currents from SW IN and OUTPUT; Pin 8 serves REF and sensing nodes - proper star grounding at the device improves regulation accuracy and transient response.
How does TL499ACPS handle transitions between series and switching regulation modes?
TL499ACPS automatically switches modes based on input conditions: series regulation activates when SERIES IN1 > VO + dropout (~1.8 V); switching regulation engages when SW REG IN2 is present and SERIES IN1 drops below threshold. Voltage deviation during transition is limited to ≤30 mV/V, ensuring stable output for sensitive loads like SRAM during AC failure.
Is TL499ACPS pin-compatible with earlier TL499 versions such as TL499ACP?
Yes, TL499ACPS shares identical pinout and electrical specifications with TL499ACP (PDIP-8), differing only in package type (SOIC-8 vs. PDIP-8) and thermal characteristics (θJA = 95°C/W vs. 85°C/W). All external circuitry, resistor values, and layout guidelines apply interchangeably - enabling drop-in replacement in space-constrained designs.
TL499ACPS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1V
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 2.9V
- Voltage - Output (Max):
- 30V
- Current - Output:
- 1A (Switch)
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
TL499ACPS FAQ
1.How can I place an order for TL499ACPS through Aetrix?
Please submit a Request for Quotation (RFQ) for TL499ACPS 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 TL499ACPS reliable?
The price and inventory of TL499ACPS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL499ACPS is usually 5 days.
3.What payment methods are accepted for TL499ACPS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL499ACPS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL499ACPS?
TL499ACPS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL499ACPS 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 TL499ACPS?
For technical support, including TL499ACPS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL499ACPS requirements.
6.How does Aetrix verify that TL499ACPS is sourced from the original manufacturer or authorized distributors?
All TL499ACPS 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 TL499ACPS meets industry standards.
7.What is the process for return or replacement of TL499ACPS?
All TL499ACPS units undergo pre-shipment inspection (PSI). If there is an issue with TL499ACPS, 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 TL499ACPS part is unused and in its original packaging.
Return procedure for TL499ACPS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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