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Texas Instruments TPS54240QDRCRQ1
- Part No.:
- TPS54240QDRCRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
TPS54240QDRCRQ1.pdf
- Description:
- IC REG BCK SPLIT RAIL ADJ 10VSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,245
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Product details
Overview
TPS54240QDRCRQ1 from Texas Instruments is an automotive-grade 42-V input, 2.5-A synchronous step-down DC/DC converter with integrated 200-mΩ high-side MOSFET, Eco-mode™ pulse-skipping control, and adjustable 100-kHz to 2.5-MHz switching frequency. It delivers regulated 3.3-V or 5-V outputs in fleet telematics modules and industrial 24-V power supplies with 138-μA quiescent current and 94–107% power-good window.
For engineers reviewing the TPS54240QDRCRQ1 datasheet, TPS54240QDRCRQ1 pinout, TPS54240QDRCRQ1 application, or TPS54240QDRCRQ1 equivalent, key selection criteria include AEC-Q100 Grade 1 qualification (–40°C to 125°C), BOOT-PH UVLO protection, RT/CLK synchronization capability, and SS/TR-controlled soft-start for sequencing in multi-rail automotive systems.
Technical Context
This current-mode buck regulator uses a fixed-frequency PWM architecture with internal slope compensation to prevent subharmonic oscillation across full duty-cycle range. Its transconductance error amplifier (310 μA/V nominal, 70 μA/V during slow-start) compares VSENSE against either 0.8-V internal reference or SS/TR voltage, enabling precise output regulation and tracking.
The device integrates boot capacitor recharge logic, BOOT-PH UVLO (2.1 V threshold), and frequency foldback during overload-ensuring stable operation at up to 100% duty cycle in dropout conditions. The open-drain PWRGD pin asserts low for VSENSE outside 92–109% of nominal, with hysteresis defined by rising/falling thresholds (94%/107%).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 42 V - supports 12-V/24-V automotive and industrial rails without external pre-regulation. |
| Output Current | 2.5 A continuous - enables single-chip power for microcontrollers, CAN transceivers, and sensor interfaces. |
| Switching Frequency | 100 kHz to 2.5 MHz - adjustable via RT resistor or external clock on RT/CLK pin for EMI optimization. |
| Quiescent Current | 138 μA - sustains ultra-low-power sleep mode in always-on automotive modules. |
| Power-Good Window | 94% to 107% of VREF - provides reliable system reset signaling with built-in hysteresis. |
| Reference Voltage | 0.8 V ±2% - sets output via resistor divider; enables 3.3-V, 5-V, and other custom voltages. |
| Shutdown Current | 1.3 μA - minimizes battery drain when disabled in ignition-off states. |
| Thermal Rating | –40°C to 125°C ambient - qualified per AEC-Q100 Grade 1 for under-hood and chassis applications. |
Pinout & Package
TPS54240QDRCRQ1 is housed in a thermally enhanced 10-pin MSOP PowerPAD™ package (DRC) with exposed thermal pad (Pin 11) requiring PCB GND connection for thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOT | Bootstrap supply node | Connects to 0.1-μF ceramic capacitor between BOOT and PH; powers high-side gate driver; monitored for UVLO. |
| COMP | Error amplifier output | Drives PWM comparator; connects to RC compensation network for loop stability. |
| EN | Enable / UVLO adjust input | Pull below 1.25 V to disable; internal 0.9-μA pullup enables floating operation; external resistors set UVLO threshold/hysteresis. |
| GND | Power and signal ground | Common return for VIN, PH, PWRGD, and thermal pad; must be low-impedance. |
| PH | High-side MOSFET source | Switching node; connects to inductor; requires low-inductance layout to minimize ringing. |
| PWRGD | Open-drain power-good output | Asserts low when VSENSE <92% or >109% of nominal; pulled up externally to enable system monitoring. |
| RT/CLK | Frequency setting / sync input | Resistor-to-GND sets fSW (100–2500 kHz); pulled above 2.2 V to accept external clock for synchronization. |
| SS/TR | Slow-start / tracking control | Capacitor sets output ramp time; resistor divider enables sequencing with other rails. |
| VIN | Main input supply | 3.5–42 V input; bypassed with ≥10-μF ceramic capacitor near package. |
| VSENSE | Feedback input | Inverting input of error amplifier; connected to resistor divider from VOUT; senses regulated output voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Eco-mode™ pulse-skipping | Reduces light-load switching losses, achieving 138-μA IQ while maintaining regulation and PLL lock. |
| Integrated boot diode | Eliminates external bootstrap diode, reducing BOM count and improving reliability in high-temp environments. |
| Adjustable UVLO with hysteresis | EN pin supports programmable start-up voltage (e.g., 6 V) and 50-mV hysteresis using two resistors. |
| Overvoltage fault protection | PWRGD OV detection disables high-side MOSFET until VOUT drops below 107%, preventing downstream damage. |
| Thermal shutdown + foldback | 182°C junction shutdown with frequency foldback during overload limits peak inductor current and dissipation. |
| MSOP PowerPAD™ package | 10-pin thermally enhanced footprint with exposed pad (Pin 11) delivering θJA = 57°C/W on custom board. |
Applications
| Fleet Telematics Module | GSM/GPRS Communication Unit |
|---|---|
|
Use Scenario: Powering GPS receiver, cellular modem, and MCU in vehicle tracking hardware operating from 12-V battery with cold-crank transients. IC Role / Device Role / Timing Role: Primary 3.3-V buck regulator supplying core logic and RF circuitry; handles input dips to 4.5 V via 100% duty-cycle capability. Use Value: 138-μA quiescent current extends battery life during parking mode; AEC-Q100 Grade 1 ensures operation at 125°C ambient. |
Use Scenario: Providing stable 5-V rail for GSM transceiver and SIM interface in E-meter security systems deployed in harsh industrial enclosures. IC Role / Device Role / Timing Role: Isolated secondary regulator fed from 24-V bus; synchronized to system clock via RT/CLK to reduce EMI coupling. Use Value: Adjustable UVLO prevents brownout resets during line sags; PWRGD signals host MCU when output deviates >6%. |
| Automotive Body Control Module (BCM) | Industrial 24-V Low-Power System |
|
Use Scenario: Generating 3.3-V supply for CAN FD controller and door-lock actuator drivers in distributed BCM nodes. IC Role / Device Role / Timing Role: Buck converter with SS/TR pin tied to master rail for controlled power-up sequencing across multiple subsystems. Use Value: Slow-start prevents inrush into large capacitive loads; Eco-mode maintains efficiency at standby currents <10 mA. |
Use Scenario: Converting 24-V factory bus to 5-V for embedded PLC I/O modules requiring long-term reliability and thermal margin. IC Role / Device Role / Timing Role: Main DC/DC stage with thermal pad soldered to copper pour; operates continuously at 85°C ambient. Use Value: 200-mΩ MOSFET and 57°C/W θJA enable 2.5-A output without heatsink; frequency foldback protects during short-circuit events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5143AQDGQRQ1 | 42-V, 3-A, dual-channel synchronous buck with spread-spectrum EMI reduction; no Eco-mode; higher IQ (250 μA). | Preferred for noise-sensitive ADAS camera power where EMI compliance is critical; not suitable for ultra-low-IQ always-on use cases. | Select LM5143AQDGQRQ1 only when dual-output capability or EMI suppression outweighs IQ penalty and cost premium. |
| TPS54340QDRCRQ1 | Same family, 3-A output rating; identical pinout, features, and AEC-Q100 Grade 1; higher current limit (4.5 A typ) and RDS(on) (150 mΩ). | Drop-in upgrade path when 2.5-A headroom is insufficient; shares same layout, compensation, and software tool support (SwitcherPro™). | Choose TPS54340QDRCRQ1 if future-proofing for higher load or lower conduction loss is required without redesign. |
Compared with LM5143AQDGQRQ1 and TPS54340QDRCRQ1, the TPS54240QDRCRQ1 offers optimal balance of ultra-low quiescent current, single-channel simplicity, and proven thermal performance in compact MSOP PowerPAD™-making it ideal for cost-sensitive, space-constrained automotive and industrial buck applications where 2.5-A output suffices.
Availability
TPS54240QDRCRQ1 is available at Aetrix Electronics and suitable for automotive telematics, industrial 24-V power supplies, and GSM/GPRS communication units requiring stable component supply with AEC-Q100 compliance and long-lifecycle support.
Supply support for TPS54240QDRCRQ1 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 automotive qualification expertise and broad manufacturing scale.
The TPS54240-Q1 belongs to TI's SWIFT™ family of high-voltage DC/DC converters designed specifically for robust, efficient power conversion in automotive and industrial environments where wide input range and AEC-Q100 reliability are mandatory.
FAQ
What is the minimum input voltage required for TPS54240QDRCRQ1 to start switching?
The TPS54240QDRCRQ1 has an internal undervoltage lockout threshold of 2.5 V, below which the device remains disabled. When enabled via the EN pin, startup occurs once VIN exceeds this threshold. For applications requiring higher start voltage-such as 6-V battery systems-external resistors on the EN pin can raise the effective UVLO point while adding hysteresis to prevent chatter during input sags. The TPS54240QDRCRQ1 datasheet specifies that EN pin pullup current is 0.9 μA, enabling precise resistor-based adjustment.
How does the Eco-mode™ control scheme in TPS54240QDRCRQ1 improve light-load efficiency?
The TPS54240QDRCRQ1 enters Eco-mode™ when output current drops low enough that peak switch current falls below ~500 mV COMP voltage threshold-typically around 5 mA for standard 3.3-V designs. In this state, the high-side MOSFET is inhibited, reducing switching and gate-drive losses. The device draws only 138 μA quiescent current while maintaining regulation, and resumes switching synchronously with the internal oscillator or external clock upon voltage droop. This behavior is confirmed in Figure 50 of the TPS54240QDRCRQ1 datasheet and enables extended battery life in always-on automotive modules.
Can TPS54240QDRCRQ1 operate at 100% duty cycle, and what limits this capability?
Yes, the TPS54240QDRCRQ1 supports 100% duty cycle operation during dropout-when VIN approaches VOUT-to maintain regulation. This capability depends on BOOT-PH voltage remaining above 2.1 V, as monitored by an internal UVLO circuit. If BOOT-PH falls below this threshold, the high-side MOSFET turns off to allow the low-side path to recharge the boot capacitor. Therefore, sustained 100% duty cycle requires sufficient inductor current to refresh the boot capacitor during each off-cycle, limiting practical use to moderate load levels and well-designed layouts with low parasitic resistance.
What is the function of the SS/TR pin on TPS54240QDRCRQ1, and how is it used for power sequencing?
The SS/TR (Slow-Start/Tracking) pin on TPS54240QDRCRQ1 controls output voltage ramp rate during startup and enables voltage tracking across multiple rails. Connecting a capacitor to ground sets soft-start time; tying SS/TR to another regulator's feedback node allows the TPS54240QDRCRQ1 output to follow that rail's rise profile. During faults or disable events, the SS/TR pin is actively discharged to ensure repeatable restart behavior. This functionality is essential for sequencing sensitive digital loads like FPGAs or multi-core MCUs where uncontrolled inrush or out-of-order power-up could cause latch-up or configuration errors.
Is TPS54240QDRCRQ1 pin-compatible with other devices in the TPS54x40-Q1 family?
Yes, the TPS54240QDRCRQ1 shares identical pinout, package (DRC), and functional interface with TPS54340QDRCRQ1 and TPS54540QDRCRQ1-all members of the same SWIFT™ automotive buck family. Differences lie solely in current rating (2.5 A, 3 A, 5 A), MOSFET RDS(on) (200 mΩ, 150 mΩ, 90 mΩ), and current-limit threshold. This enables direct layout reuse and simplified BOM scaling across product tiers. No changes to PCB footprint, compensation network, or control logic are needed when upgrading within the family.
TPS54240QDRCRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Eco-Mode™
- Package/Case:
- 10-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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 ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-VSON (3x3)
TPS54240QDRCRQ1 FAQ
1.How can I place an order for TPS54240QDRCRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS54240QDRCRQ1 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 TPS54240QDRCRQ1 reliable?
The price and inventory of TPS54240QDRCRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS54240QDRCRQ1 is usually 5 days.
3.What payment methods are accepted for TPS54240QDRCRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS54240QDRCRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS54240QDRCRQ1?
TPS54240QDRCRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS54240QDRCRQ1 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 TPS54240QDRCRQ1?
For technical support, including TPS54240QDRCRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS54240QDRCRQ1 requirements.
6.How does Aetrix verify that TPS54240QDRCRQ1 is sourced from the original manufacturer or authorized distributors?
All TPS54240QDRCRQ1 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 TPS54240QDRCRQ1 meets industry standards.
7.What is the process for return or replacement of TPS54240QDRCRQ1?
All TPS54240QDRCRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TPS54240QDRCRQ1, 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 TPS54240QDRCRQ1 part is unused and in its original packaging.
Return procedure for TPS54240QDRCRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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