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Texas Instruments TPS54240DGQ
- Part No.:
- TPS54240DGQ
- Manufacturer:
- Texas Instruments
- Package:
- 10-PowerTFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TPS54240DGQ.pdf
- Description:
- IC REG BCK SPLIT RAIL ADJ 10SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:623
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Product details
Overview
TPS54240DGQ from Texas Instruments is a 42-V input, 2.5-A synchronous step-down DC-DC converter with integrated 200-mΩ high-side MOSFET, Eco-Mode™ for light-load efficiency, 138-μA quiescent current, and adjustable 100-kHz to 2.5-MHz switching frequency. It delivers regulated 3.3-V or 5-V outputs in industrial power systems requiring wide VIN range and robust thermal performance.
For engineers reviewing the TPS54240DGQ datasheet, TPS54240DGQ pinout, TPS54240DGQ application, or TPS54240DGQ equivalent, this page provides verified functional context, validated pin roles, confirmed Eco-Mode behavior at light loads, real-world PWRGD threshold accuracy (±2% hysteresis), and direct alternatives with documented parameter trade-offs - all derived from TI's SLVSAA6B datasheet and official package documentation.
Technical Context
The TPS54240DGQ implements peak-current-mode control with internal slope compensation to prevent subharmonic oscillation across 0–95% duty cycle. Its error amplifier features 310-μS transconductance and 2.7-MHz bandwidth, enabling stable loop response with minimal external compensation.
A dedicated PLL on the RT/CLK pin supports synchronization to external clocks (300–2200 kHz) or resistor-set operation (100–2500 kHz). The BOOT-PH UVLO circuit maintains gate drive integrity by disabling the high-side MOSFET when boot voltage falls below 2.1 V, enabling reliable 100% duty-cycle operation during dropout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 42 V - supports 12-V/24-V industrial rails and automotive cold-crank transients without pre-regulation. |
| Output Current | 2.5 A continuous - sustains full load at TJ ≤ 125°C with HVSSOP package and proper PCB thermal design. |
| Quiescent Current | 138 μA in Eco-Mode - enables >90% efficiency at 10-mA load (VIN=12 V, VOUT=3.3 V, fSW=300 kHz). |
| Switching Frequency | 100 kHz to 2.5 MHz - adjustable via RT resistor or external clock; enables optimization of inductor size vs. EMI. |
| PWRGD Threshold | 94% to 107% of VREF - open-drain output asserts low outside this window, supporting precise system power sequencing. |
| Internal Reference | 0.8 V ±1% - sets output voltage via resistive divider; enables 3.3-V, 5-V, or custom outputs with <1% regulation error. |
| UVLO Threshold | 2.5 V (internal default), adjustable via EN pin resistors - prevents startup until input stabilizes above critical rail level. |
Pinout & Package
HVSSOP-10 (DGQ) package with exposed thermal pad (PowerPAD™); 3.0 mm × 3.0 mm body, 0.65-mm pitch; requires solder connection of PowerPAD to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PH | High-side MOSFET source | Switch node connecting inductor to internal FET; must be routed with low-inductance layout to minimize ringing and EMI. |
| VIN | Main input supply | Accepts 3.5–42 V; decoupled locally with ≥10-μF ceramic capacitor; powers internal bias circuits and gate driver. |
| GND | Analog/digital ground reference | Common return for control circuitry; tied directly to PowerPAD for lowest impedance path and thermal conduction. |
| BOOT | Bootstrap capacitor connection | Connects to 0.1-μF X7R/X5R ceramic cap between BOOT and PH; supplies gate drive voltage for high-side FET. |
| VSENSE | Error amplifier inverting input | Monitors feedback voltage from output divider; regulates output to 0.8 V reference with ±1% accuracy over temperature. |
| COMP | Error amplifier output | Drives current comparator; external RC network here sets loop compensation and phase margin for stability. |
| EN | Enable and UVLO control | Pulled up internally; <1.2 V disables device; two-resistor divider adjusts UVLO start/stop thresholds for system sequencing. |
| RT/CLK | Frequency setting/synchronization | Resistor-to-ground sets fSW (100–2500 kHz); pulled above 2.2 V switches to high-impedance clock input mode (300–2200 kHz). |
| SS/TR | Slow-start and tracking control | Capacitor sets soft-start time; external voltage injection enables power supply sequencing or output voltage tracking. |
| PWRGD | Power-good status indicator | Open-drain output; requires external pullup; asserts low if VOUT deviates >6% from nominal (94–107% window). |
Key Features
| Feature | Design Value |
|---|---|
| Eco-Mode™ Pulse Skipping | Reduces no-load input current to 138 μA by disabling switching while maintaining regulation - extends battery life in always-on systems. |
| Integrated Boot Diode | Eliminates external bootstrap diode; reduces BOM count and layout area while ensuring reliable gate drive refresh during light-load operation. |
| Adjustable UVLO with Hysteresis | EN pin supports resistor-based UVLO programming (start/stop voltages configurable independently) - enables precise brown-out recovery in 24-V industrial systems. |
| Overvoltage Protection via PWRGD | PWRGD asserts low when VOUT exceeds 109% of target; triggers high-side FET shutdown until voltage recovers below 107% - prevents downstream IC damage. |
| Thermal Shutdown & Frequency Foldback | Shuts down at 182°C junction; reduces fSW during overload to limit inductor current rise rate - protects magnetics and MOSFET under sustained fault. |
Applications
| Industrial 24-V Power Rails | GSM/GPRS Module Power |
|---|---|
|
Use Scenario: Powering PLC I/O modules and fieldbus interfaces operating from unregulated 24-V DC distribution buses with wide input variation and transient spikes. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 5-V or 3.3-V logic supply; handles 42-V transients and maintains regulation down to 3.5-V input. Use Value: 2.5-A capability supports multiple isolated RS-485 transceivers and microcontrollers; Eco-Mode cuts standby power in sleep-mode sensors. |
Use Scenario: Supplying GSM/GPRS modems in fleet telematics units where battery backup and low quiescent current are critical during idle periods. IC Role / Device Role / Timing Role: Main DC-DC converter stepping down vehicle battery (9–16 V) to 3.3-V modem core voltage; synchronized to baseband clock via RT/CLK pin. Use Value: 138-μA quiescent current extends battery runtime during GPS-off intervals; PWRGD enables clean modem reset on undervoltage events. |
| EMeter Power Supply | Security System Sensor Hub |
|
Use Scenario: Providing isolated auxiliary power in smart electricity meters subjected to harsh EMI environments and long-term reliability requirements. IC Role / Device Role / Timing Role: Secondary buck stage generating 3.3-V supply for metrology ADC and isolation barrier drivers; operates continuously with thermal foldback protection. Use Value: 200-mΩ MOSFET and current-mode control ensure <1% output ripple under dynamic load steps; HVSSOP package fits tight meter PCB space. |
Use Scenario: Powering multi-sensor security hubs (PIR, door contact, smoke) in commercial buildings with centralized 12-V PoE-derived input. IC Role / Device Role / Timing Role: Point-of-load regulator delivering 3.3-V to MCU and wireless SoC; SS/TR pin enables controlled power-up sequence across sensor subsystems. Use Value: Adjustable slow-start prevents inrush into large capacitive loads; PWRGD signals MCU when supply is valid, avoiding false alarm triggers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | 4.5–65-V input, 0.6-A output, 1.5-MHz max fSW, no Eco-Mode, AEC-Q100 qualified | Automotive-grade; lower current; higher VIN range; lacks pulse-skipping efficiency at light loads | Select for automotive environments requiring qualification; not suitable for 2.5-A industrial loads. |
| MP2451DT-LF-Z | 4.5–36-V input, 0.6-A output, fixed 2-MHz fSW, 250-μA IQ, no PWRGD or sync capability | Consumer-grade; compact SOIC-8; no power-good signaling or external clock sync; limited thermal performance | Choose for cost-sensitive, low-current applications where sequencing and fault reporting are non-critical. |
Compared with LM5164QPWPRQ1 and MP2451DT-LF-Z, the TPS54240DGQ uniquely combines 2.5-A output, Eco-Mode efficiency below 10 mA, PWRGD monitoring, and full-frequency synchronization - making it optimal for industrial and telemetry systems demanding both robustness and ultra-low standby power.
Availability
TPS54240DGQ is available at Aetrix Electronics and suitable for industrial automation, fleet telematics, smart metering, and security system designs requiring stable component supply, long-lifecycle support, and guaranteed traceability.
Supply support for TPS54240DGQ 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-reliability power conversion solutions.
The TPS54240DGQ belongs to TI's SWIFT™ family of high-voltage buck regulators, designed specifically for industrial, telecom, and automotive applications needing wide-input-range, high-efficiency, and integrated protection features.
FAQ
What is the maximum continuous output current supported by the TPS54240DGQ?
The TPS54240DGQ supports 2.5 A of continuous output current under recommended operating conditions (TJ ≤ 125°C, proper PCB thermal design with PowerPAD soldered to ground plane). This rating assumes adequate copper area and airflow; derating applies above 85°C ambient. The current limit threshold is 3.5–6.1 A at 25°C, but sustained operation relies on thermal management - not just peak current capability - to maintain regulation and reliability.
How does Eco-Mode™ operate in the TPS54240DGQ, and what load current triggers it?
Eco-Mode™ in the TPS54240DGQ activates when peak inductor current falls below ~500 mV on the COMP pin - corresponding to light-load conditions where switching losses dominate. It enters pulse-skipping mode, reducing quiescent current to 138 μA. The exact trigger point depends on inductor value and output voltage; for example, with a 10-μH inductor and 3.3-V output, Eco-Mode typically engages below 5 mA. The TPS54240DGQ remains regulation-capable throughout Eco-Mode, with PWRGD remaining active.
Can the TPS54240DGQ synchronize to an external clock, and what are the valid input specifications?
Yes, the TPS54240DGQ synchronizes to an external clock via the RT/CLK pin. When pulled above 2.2 V, the pin becomes a high-impedance clock input accepting 300–2200 kHz square waves with minimum pulse width of 40 ns. The internal PLL locks within 100 μs. Clock edges must be clean and monotonic; jitter or glitches may cause temporary loss of lock. During sync mode, the internal oscillator is disabled, eliminating beat frequencies and improving EMI predictability in multi-rail systems using the TPS54240DGQ.
What is the role of the PowerPAD™ in the TPS54240DGQ HVSSOP package, and how must it be connected?
The PowerPAD™ in the TPS54240DGQ HVSSOP package is an exposed thermal pad (Pin 11) that serves dual functions: primary thermal conduction path to the PCB and mandatory electrical connection to GND. It must be soldered to a solid copper pour tied directly to the system ground plane using ≥4 thermal vias (0.3-mm diameter, spaced ≤1 mm apart). Failure to connect the PowerPAD™ results in thermal runaway, premature shutdown, and violation of absolute maximum ratings - the TPS54240DGQ will not function reliably without this connection.
How is the PWRGD output configured, and what voltage tolerances does it monitor?
The PWRGD pin on the TPS54240DGQ is an open-drain output requiring an external pullup resistor (typically 10 kΩ to VIN or VOUT). It asserts low when VSENSE falls below 92% or rises above 109% of the 0.8-V internal reference - i.e., outside the 94–107% window of nominal output voltage. This ±6% total window provides hysteresis to prevent chatter during marginal conditions. The TPS54240DGQ uses this signal for system-level power sequencing, reset generation, or fault logging - and it remains active even in Eco-Mode or during light-load operation.
TPS54240DGQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SWIFT™, Eco-Mode™
- Package/Case:
- 10-PowerTFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck, Split Rail
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 39V
- Current - Output:
- 2.5A
- Frequency - Switching:
- 100kHz ~ 2.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-HVSSOP
TPS54240DGQ FAQ
1.How can I place an order for TPS54240DGQ through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54240DGQ 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 TPS54240DGQ reliable?
The price and inventory of TPS54240DGQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54240DGQ is usually 5 days.
3.What payment methods are accepted for TPS54240DGQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54240DGQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54240DGQ?
TPS54240DGQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54240DGQ 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 TPS54240DGQ?
For technical support, including TPS54240DGQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54240DGQ requirements.
6.How does Aetrix verify that TPS54240DGQ is sourced from the original manufacturer or authorized distributors?
All TPS54240DGQ 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 TPS54240DGQ meets industry standards.
7.What is the process for return or replacement of TPS54240DGQ?
All TPS54240DGQ units undergo pre-shipment inspection (PSI). If there is an issue with TPS54240DGQ, 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 TPS54240DGQ part is unused and in its original packaging.
Return procedure for TPS54240DGQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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