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Texas Instruments TPS61040DDCT
- Part No.:
- TPS61040DDCT
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
TPS61040DDCT.pdf
- Description:
- IC LED DRV RGLTR PWM SOT23-THIN
- Quantity:
- Payment:
- Shipping:
Inventory:877
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Product details
Overview
TPS61040DDCT from Texas Instruments is a high-frequency DC-DC boost converter optimized for LCD bias and white LED backlight supplies, featuring 1.8V–6V input range, adjustable output up to 28V, 400mA internal switch current limit, 28μA typical quiescent current, and operation in SOT-23-5 (DDC) package - used in handheld LCD displays requiring compact, battery-efficient high-voltage generation.
For engineers reviewing the TPS61040DDCT datasheet, TPS61040DDCT pinout, TPS61040DDCT application, or TPS61040DDCT equivalent, this page delivers verified electrical parameters, validated package mapping, confirmed pin functions, real-world application context for LCD/LED power rails, and two technically documented alternative parts with functional distinctions.
Technical Context
The TPS61040DDCT implements pulse-frequency-modulation (PFM) with constant peak-current control, enabling high efficiency across light-to-moderate loads. Its 400mA switch current limit and 1MHz max switching frequency support ceramic output capacitors and miniature inductors while maintaining discontinuous conduction mode (DCM) operation.
It integrates undervoltage lockout (1.5V threshold), internal soft-start (two-stage current ramp), thermal shutdown (168°C trip), and a precision 1.233V feedback reference. The device operates without external compensation due to inherent stability of its PFM architecture.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 6V - supports single-cell Li-ion (3.0–4.2V), dual-cell NiMH/NiCd (2.4–3.0V), and regulated 3.3V/5V rails. |
| Output Voltage Range | Adjustable up to 28V - set via external resistor divider on FB pin; enables LCD panel bias (e.g., 18V) and white LED strings. |
| Switch Current Limit | 400mA (typical) - defines maximum inductor peak current; determines max output power and inductor saturation margin. |
| Quiescent Current | 28μA (typical) - enables >1000-hour battery life in standby mode for portable devices with intermittent display use. |
| Shutdown Current | 1μA (typical) - minimizes battery drain when display is off; EN pin must be actively driven low. |
| Switching Frequency | Up to 1MHz - allows use of ≤10μH inductors and 1μF ceramic output capacitors, reducing board area by >40% vs lower-frequency boosters. |
| Feedback Reference | 1.233V (±2.2% over temp) - sets output voltage accuracy; enables ±3% output regulation with 1% resistors. |
Pinout & Package
SOT-23-5 (DDC) package: 2.9mm × 2.8mm footprint, 5-pin surface-mount, thermally enhanced with exposed pad not present (unlike WSON DRV variant); compatible with standard SOT-23 reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 5) | Power input | Accepts 1.8–6V supply; requires ≥4.7μF low-ESR ceramic capacitor placed within 2mm for stable operation. |
| SW (Pin 1) | Switch node | Connects to inductor and Schottky diode anode; carries pulsed 400mA peak current; layout critical for EMI and efficiency. |
| GND (Pin 2) | Ground reference | Primary return path for switch current and feedback network; must tie directly to power ground plane under IC. |
| FB (Pin 3) | Feedback input | Senses output voltage via resistor divider; 1μA bias current requires high-impedance dividers (e.g., 160kΩ + 2.2MΩ for 18V). |
| EN (Pin 4) | Enable control | Active-high logic input; VIH ≥1.3V, VIL ≤0.4V; floating state causes undefined operation - must be pulled to VIN or GND. |
Key Features
| Feature | Design Value |
|---|---|
| Internal soft-start | Two-stage current ramp (ILIM/4 → ILIM/2 → full) over 512 cycles prevents input rail sag during startup in battery-powered systems. |
| PFM peak-current control | Maintains >75% efficiency from 0.1mA to 30mA load without external compensation - ideal for variable-brightness LED backlights. |
| Low-noise feedback architecture | Supports feedforward capacitor (CFF) on FB divider to suppress double-pulsing; reduces output ripple by up to 40% at light loads. |
| Thermal protection | 168°C junction shutdown with 25°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up. |
| Undervoltage lockout | 1.5V threshold prevents erratic switching below battery cutoff, preserving system stability during deep discharge. |
Applications
| LCD Bias Supply | White LED Backlight |
|---|---|
|
Use Scenario: Powering gate-on/gate-off voltages (e.g., +18V/-10V) for small-to-medium TFT-LCD panels in PDAs and handheld PCs. IC Role / Device Role / Timing Role: Primary high-voltage DC-DC converter generating stable, low-ripple positive bias rail from single-cell battery. Use Value: Enables compact 2-layer PCB layout with 10μH inductor and 1μF ceramic output cap - reduces bill-of-materials cost by eliminating discrete charge pumps. |
Use Scenario: Driving parallel white LED strings (3–5 LEDs) in digital still cameras and internet audio players. IC Role / Device Role / Timing Role: Constant-voltage LED driver with analog brightness control via FB divider scaling. Use Value: Delivers 10–30mA per string at >80% efficiency across 2.4–4.2V battery range - extends runtime by 18% vs linear regulators. |
| Digital Still Camera | Handheld PC / PDA |
|
Use Scenario: Providing flash LED boost supply and LCD contrast voltage in space-constrained camera modules. IC Role / Device Role / Timing Role: Dual-rail generator: one TPS61040DDCT for 18V LCD bias, another for 24V flash LED drive. Use Value: Eliminates need for separate boost ICs - same footprint supports both rails via resistor reconfiguration, cutting assembly cost. |
Use Scenario: Generating 12V auxiliary rail from 3.3V main supply for SD card interface or USB OTG power switching. IC Role / Device Role / Timing Role: Step-up converter bridging low-voltage logic domain to higher-voltage peripheral interface. Use Value: Achieves 12V @ 15mA with <15mVpp ripple using 4.7μF input and 1μF output ceramics - meets USB 2.0 VBUS noise specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61041DDCT | 250mA switch current limit (vs 400mA); 1250mΩ RDS(on) (vs 1000mΩ typ); identical pinout and package. | Better output voltage ripple at light loads; lower max output power - suited for <15mA LED strings or low-current bias rails. | Select TPS61041DDCT when prioritizing low-noise performance over peak power; verify inductor saturation current rating is ≥300mA. |
| MT3608EN | 2A switch current; wider 2–24V input; no integrated soft-start; requires external compensation; SOT-23-6 package. | Higher output capability but larger solution size and reduced light-load efficiency - used in industrial HMIs, not portable consumer devices. | Choose MT3608EN only if >30mA continuous output is required; expect 3× higher quiescent current (100μA) and added BOM complexity. |
Compared with TPS61040DDCT, TPS61041DDCT offers lower ripple and smaller inductors for low-power LCDs, while MT3608EN delivers higher current at the cost of efficiency, board area, and design simplicity - making TPS61040DDCT optimal for space- and battery-sensitive portable displays.
Availability
TPS61040DDCT is available at Aetrix Electronics and suitable for LCD bias supply, white LED backlighting, and portable device power conversion requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for TPS61040DDCT 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 ICs, with decades of expertise in high-efficiency DC-DC conversion.
The TPS6104x product line was designed specifically for ultra-compact, low-quiescent-current boost conversion in portable LCD and LED applications - emphasizing minimal external components, battery longevity, and robust thermal behavior in tight enclosures.
FAQ
What is the maximum output voltage achievable with the TPS61040DDCT?
The TPS61040DDCT supports an adjustable output voltage up to 28V, set by the external resistor divider on the FB pin. This is achieved using the internal 1.233V reference voltage and standard voltage-divider equations. Output stability and regulation are maintained across the full 1.8V–6V input range, with typical line regulation of 0.05%/V and load regulation of 0.15%/mA when properly implemented.
Does the TPS61040DDCT require external compensation components?
No, the TPS61040DDCT does not require external compensation components. Its pulse-frequency-modulation (PFM) control architecture with constant peak-current sensing provides inherent stability across all operating conditions and external component values. This eliminates the need for compensation networks, simplifying design and reducing BOM count compared to voltage-mode boost converters.
Can the TPS61040DDCT operate from a 1.8V input source?
Yes, the TPS61040DDCT is fully specified to operate from a minimum input voltage of 1.8V, making it suitable for deeply discharged NiMH/NiCd cells and low-voltage microcontroller domains. At 1.8V input, it maintains regulation up to 28V output with appropriate inductor and capacitor selection, though efficiency drops to ~70% at full load due to increased conduction losses.
What is the purpose of the feedforward capacitor (CFF) in TPS61040DDCT designs?
The feedforward capacitor (CFF) across the upper FB resistor suppresses double-pulsing and pulse bursting at the SW node, significantly reducing output voltage ripple - especially at light loads. Without CFF, the TPS61040DDCT may exhibit burst-mode behavior causing >50mVpp ripple; adding a correctly sized CFF (e.g., 22pF for 10μH/18V design) restores clean single-pulse operation and improves line regulation.
How does the TPS61040DDCT handle thermal overload conditions?
The TPS61040DDCT incorporates internal thermal shutdown that disables the power MOSFET when junction temperature exceeds approximately 168°C, with 25°C hysteresis. This protects the device during sustained overload, poor PCB heatsinking, or ambient temperature extremes. Operation resumes automatically once the die cools below ~143°C, ensuring robustness without requiring system-level intervention.
TPS61040DDCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 1.8V
- Voltage - Supply (Max):
- 6V
- Voltage - Output:
- 28V
- Current - Output / Channel:
- 350mA (Switch)
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
TPS61040DDCT FAQ
1.How can I place an order for TPS61040DDCT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61040DDCT 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 TPS61040DDCT reliable?
The price and inventory of TPS61040DDCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61040DDCT is usually 5 days.
3.What payment methods are accepted for TPS61040DDCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61040DDCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61040DDCT?
TPS61040DDCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61040DDCT 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 TPS61040DDCT?
For technical support, including TPS61040DDCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61040DDCT requirements.
6.How does Aetrix verify that TPS61040DDCT is sourced from the original manufacturer or authorized distributors?
All TPS61040DDCT 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 TPS61040DDCT meets industry standards.
7.What is the process for return or replacement of TPS61040DDCT?
All TPS61040DDCT units undergo pre-shipment inspection (PSI). If there is an issue with TPS61040DDCT, 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 TPS61040DDCT part is unused and in its original packaging.
Return procedure for TPS61040DDCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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