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Texas Instruments LM20242MHX/NOPB
- Part No.:
- LM20242MHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM20242MHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,465
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Product details
Overview
LM20242MHX/NOPB from Texas Instruments is a 36V, 2A synchronous buck regulator with current-mode control, 1.5% output voltage accuracy, integrated 130 mΩ/110 mΩ MOSFETs, and resistor-programmable switching frequency up to 1 MHz. It delivers regulated power in high-voltage industrial and communications systems requiring tight output tracking and pre-biased startup capability.
For engineers reviewing the LM20242MHX/NOPB datasheet, LM20242MHX/NOPB pinout, LM20242MHX/NOPB application, or LM20242MHX/NOPB equivalent, key selection criteria include its 4.5–36V input range, 0.8V adjustable output, PGOOD monitoring, soft-start/tracking dual-function pin, and HTSSOP-20 exposed-pad thermal performance.
Technical Context
The LM20242MHX/NOPB implements peak current mode control with non-linear (parabolic) slope compensation to maintain stability across all output voltages-unlike fixed linear ramp schemes. Its error amplifier features 515 µmho transconductance and 7 MHz gain-bandwidth, enabling stable loop compensation with only two external components.
It integrates OVP (110% VFB threshold), UVLO (3.9V turn-on with 200 mV hysteresis), thermal shutdown (170°C), and cycle-by-cycle current limiting (3.7A typical peak). The SS/TRK pin supports both programmable soft-start via external capacitor and monotonic voltage tracking of higher-rail supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous; supports full load without derating at TJ ≤ 125°C in HTSSOP-20 with proper PCB copper |
| Input Voltage Range | 4.5V to 36V; enables direct regulation from 12V/24V/36V industrial buses without pre-regulation |
| Feedback Reference | 0.8V ±1.5%; sets minimum output voltage and defines RFB1/RFB2 divider ratio |
| Switching Frequency | Programmable 100 kHz–1 MHz via RT-to-AGND resistor; allows optimization of size vs. efficiency |
| Quiescent Current | 3 mA typical at full load; enables low-power standby operation without disabling regulator |
| PGOOD Accuracy | ±2% hysteresis around 95% VFB; provides reliable power sequencing and fault detection |
| Thermal Resistance | θJA = 30°C/W (0 LFM); requires ≥200 mm² exposed pad copper for full 2A rating |
Pinout & Package
LM20242MHX/NOPB uses a thermally enhanced HTSSOP-20 package with exposed pad (EP), optimized for high-current DC/DC conversion in space-constrained industrial and telecom applications. The exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SS/TRK | Soft-start/Tracking control | 5 µA internal current source charges external capacitor; also accepts external voltage ramp for rail tracking |
| 2 FB | Feedback input | Connects to resistor divider; referenced to precise 0.8V internal bandgap; bias current <50 nA |
| 3 PGOOD | Open-drain power-good flag | Asserts high-Z when VOUT within ±5% of target; requires external 10–100 kΩ pull-up |
| 4 COMP | Error amplifier output | Interface point for Type II/III compensation network between COMP and AGND |
| 5,6,15,16 VIN | Main input supply | Accepts 4.5–36V; multiple pins reduce trace resistance and improve high-current handling |
| 7,8,13,14 SW | Switch node | Drain of high-side NMOS + source of low-side NMOS; connects to inductor and bootstrap capacitor |
| 9,10,11 GND | Power ground | Common return for MOSFETs and high-current paths; separate from AGND |
| 12 AGND | Analog ground | Reference for feedback, error amp, and control circuitry; must be star-connected to minimize noise |
| 17 BOOT | Bootstrap supply | Charged via internal diode from VCC; powers high-side gate driver; requires 0.1 µF ceramic to SW |
| 18 VCC | Internal LDO output | Regulated ~5.5V output (up to 7.2V input); powers internal logic; requires local 0.1–1 µF decoupling |
| 19 EN | Enable/UVLO input | 1.25V threshold with 50 mV hysteresis; internal 2 µA pull-up enables default-on operation |
| 20 RT | Oscillator frequency set | Bias voltage 550 mV; resistor to AGND programs fSW from 100 kHz to 1 MHz |
| EP | Exposed pad | Internally connected to GND; mandatory thermal and electrical connection to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Non-linear slope compensation | Parabolic ramp adapts to output voltage, eliminating sub-harmonic oscillation across full VOUT range without manual tuning |
| Pre-biased startup support | Prevents sinking current during startup if VOUT > 0V-critical for FPGA/DSP multi-rail sequencing |
| Diode emulation mode | Disables low-side FET at zero inductor current to avoid reverse conduction, improving light-load efficiency below 100 mA |
| Adjustable soft-start & tracking | Single SS/TRK pin enables either timed ramp-up or synchronized voltage ramp with external rail-no extra ICs required |
| Integrated protection suite | OVP, UVP, thermal shutdown, cycle-by-cycle current limit, and UVLO ensure robust operation under fault conditions |
Applications
| Industrial PLC Power Rails | Automotive Infotainment Core Supply |
|---|---|
Use Scenario: Regulating 3.3V or 5V from 12V/24V vehicle battery with load transients up to 1.5A. IC Role / Device Role / Timing Role: Primary synchronous buck controller delivering clean, sequenced core voltage to SoC and display drivers. Use Value: Diode emulation mode maintains >88% efficiency at 50 mA load; PGOOD enables safe boot sequencing with MCU. | Use Scenario: Generating 1.2V for FPGA I/O banks while tracking a 3.3V auxiliary rail during cold start. IC Role / Device Role / Timing Role: Adjustable-frequency buck regulator operating in tracking mode via SS/TRK pin. Use Value: SS/TRK pin accepts external ramp from 3.3V rail, ensuring monotonic 1.2V rise without undershoot or reverse current. |
| Telecom Line Card Bias | Test Equipment Point-of-Load |
Use Scenario: Providing isolated 2.5V/1.8V supplies on dense line cards with strict thermal limits and EMI constraints. IC Role / Device Role / Timing Role: High-efficiency, high-frequency (600 kHz) buck converter minimizing inductor size and conducted noise. Use Value: 1 MHz capability allows 2.2 µH inductor; θJA = 30°C/W enables full 2A output with 4-layer board copper pour. | Use Scenario: Programmable bench supply module requiring stable 0.8–5V output with remote sensing and status reporting. IC Role / Device Role / Timing Role: Adjustable-output buck regulator with precision enable, PGOOD, and soft-start for system integration. Use Value: 1.5% VREF accuracy and 50 mV EN hysteresis allow repeatable voltage setting and glitch-immune power sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM25088MHX/NOPB | Wider 4.5–40V input, lower 1.5A rating, no PGOOD, no tracking pin | Suitable for cost-sensitive 12V/24V systems where rail sequencing is not required | Select when input exceeds 36V or PGOOD is unnecessary; verify thermal margin at 1.5A |
| TPS54240DGQR | 4.5–40V input, 2A rating, integrated soft-start, but no SS/TRK dual function or diode emulation | Better for fixed-frequency designs needing fast transient response over wide temperature range | Choose when simplified layout (single SS cap) outweighs tracking flexibility; confirm loop stability without parabolic slope |
Compared with LM20242MHX/NOPB, LM25088MHX/NOPB trades tracking and PGOOD for extended input range, while TPS54240DGQR offers tighter thermal specs but lacks the adaptive slope compensation and pre-bias safety critical for FPGA power.
Availability
LM20242MHX/NOPB is available at Aetrix Electronics and suitable for industrial automation, automotive infotainment, and telecom infrastructure applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM20242MHX/NOPB 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 decades of expertise in high-reliability power conversion ICs.
The LM20242MHX/NOPB belongs to TI's PowerWise® synchronous buck regulator family, engineered for high-voltage industrial and communications systems demanding precision regulation, robust protection, and flexible sequencing.
FAQ
What is the minimum output voltage supported by the LM20242MHX/NOPB?
The LM20242MHX/NOPB supports an adjustable output voltage down to 0.8V, set by the internal 0.8V feedback reference voltage and external resistor divider. This enables direct generation of low-core voltages for modern FPGAs and microprocessors without additional post-regulation stages. The 1.5% reference accuracy ensures tight tolerance across temperature and line variations.
Does the LM20242MHX/NOPB support pre-biased output startup?
Yes, the LM20242MHX/NOPB supports pre-biased startup: it will not sink current from a pre-charged output, preventing damage to downstream loads like FPGAs during multi-rail power-up. The device waits until the internal soft-start ramp exceeds the FB pin voltage before enabling switching, preserving load integrity without external circuitry.
How is switching frequency programmed on the LM20242MHX/NOPB?
Switching frequency on the LM20242MHX/NOPB is set by connecting an external resistor (RRT) between the RT pin and AGND. The RT pin is biased at 550 mV; typical values range from 24.9 kΩ (≈325 kHz) to 49.9 kΩ (≈750 kHz). Equation 8 in the datasheet provides exact calculation, and the oscillator remains stable across input voltage and temperature.
What thermal design considerations apply to the LM20242MHX/NOPB in HTSSOP-20 package?
The LM20242MHX/NOPB HTSSOP-20 package requires the exposed pad (EP) to be soldered to a minimum 200 mm² PCB copper area tied to GND for thermal performance. With θJA = 30°C/W (0 LFM), full 2A operation at 125°C junction temperature demands adequate copper and airflow. Thermal shutdown triggers at 170°C with 20°C hysteresis, allowing safe recovery.
Can the LM20242MHX/NOPB operate in discontinuous conduction mode (DCM)?
Yes, the LM20242MHX/NOPB automatically enters diode emulation mode in light-load DCM to prevent negative inductor current, improving efficiency below ~100 mA. At very light loads, it further reduces effective switching frequency via pulse-skipping-enabling >85% efficiency at 10 mA while maintaining regulation and PGOOD integrity.
LM20242MHX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- PowerWise®
- Package/Case:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 32.4V
- Current - Output:
- 2A
- Frequency - Switching:
- 100kHz ~ 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
LM20242MHX/NOPB FAQ
1.How can I place an order for LM20242MHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM20242MHX/NOPB 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 LM20242MHX/NOPB reliable?
The price and inventory of LM20242MHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM20242MHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM20242MHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM20242MHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM20242MHX/NOPB?
LM20242MHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM20242MHX/NOPB 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 LM20242MHX/NOPB?
For technical support, including LM20242MHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM20242MHX/NOPB requirements.
6.How does Aetrix verify that LM20242MHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM20242MHX/NOPB 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 LM20242MHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM20242MHX/NOPB?
All LM20242MHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM20242MHX/NOPB, 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 LM20242MHX/NOPB part is unused and in its original packaging.
Return procedure for LM20242MHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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