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Texas Instruments LM20242MHE/NOPB
- Part No.:
- LM20242MHE/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM20242MHE/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,360
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Product details
Overview
LM20242MHE/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 power MOSFETs, and resistor-programmable switching frequency up to 1 MHz. It delivers regulated DC-DC conversion for FPGA, DSP, and ASIC core supplies in industrial and communications infrastructure systems.
For engineers reviewing the LM20242MHE/NOPB datasheet, LM20242MHE/NOPB pinout, LM20242MHE/NOPB application, or LM20242MHE/NOPB equivalent, key selection criteria include soft-start programmability via SS/TRK, PGOOD monitoring, pre-biased startup capability, and non-linear slope compensation for stable operation across 0.8V–36V input and wide output voltage ranges.
Technical Context
The LM20242MHE/NOPB implements peak current-mode control with non-linear (parabolic) slope compensation, enabling stable operation at duty cycles >50% without external ramp injection. Its error amplifier features 515 µmho transconductance and 7 MHz gain-bandwidth product, supporting two-component Type II compensation.
It integrates dual N-channel MOSFETs (130 mΩ high-side, 110 mΩ low-side), precision 0.8V reference, programmable UVLO via EN pin, and cycle-by-cycle current limiting with 3.7A typical peak threshold. The device supports diode emulation mode for light-load efficiency and monotonic startup with pre-biased outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous; supports sustained load delivery without thermal derating under typical PCB layout conditions. |
| Input Voltage Range | 4.5V to 36V; enables direct regulation from 5V, 12V, 24V, and 36V industrial buses without pre-regulation. |
| Feedback Reference | 0.8V ±1.5%; sets minimum adjustable output voltage and defines resistor-divider scaling for precise VOUT programming. |
| Switching Frequency | Programmable 100 kHz–1 MHz via RT-to-AGND resistor; allows optimization of inductor size, efficiency, and EMI profile. |
| Current Limit Threshold | 3.7A typical peak; provides robust short-circuit protection while permitting use of smaller-saturation-current inductors. |
| Thermal Shutdown | 170°C with 20°C hysteresis; ensures safe shutdown and automatic recovery without external thermal management circuitry. |
| PGOOD Accuracy | ±5% window around 95% of VFB; enables reliable system power sequencing and fault detection with 20 µs deglitching. |
Pinout & Package
LM20242MHE/NOPB is housed in a thermally enhanced HTSSOP-20 package with exposed pad (EP), optimized for high-power-density layouts and efficient heat transfer to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SS/TRK | Soft-start/Tracking control | 5 µA internal current source charges external capacitor for controlled ramp-up; also accepts external voltage for rail tracking. |
| 2 FB | Feedback input | Connects to resistor divider; referenced to internal 0.8V bandgap; 50 nA bias current minimizes divider error. |
| 3 PGOOD | Open-drain power-good indicator | Asserts low when VOUT deviates >5% from regulation; requires 10 kΩ–100 kΩ pull-up for logic-level interfacing. |
| 4 COMP | Error amplifier output / PWM input | Interface point for external Type II compensation network between COMP and AGND. |
| 5,6,15,16 VIN | Main input supply | Accepts 4.5V–36V; multiple pins reduce trace resistance and improve high-current path integrity. |
| 7,8,13,14 SW | Switch node | Drain of HS-FET / source of LS-FET; high dv/dt node requiring tight layout and minimized loop area. |
| 9,10,11 GND | Power ground | Common return for power MOSFETs; separate from AGND to isolate noise-sensitive analog circuitry. |
| 12 AGND | Analog ground | Reference for error amplifier, reference, and control logic; must be connected to GND at single point near EP. |
| 17 BOOT | Bootstrap supply | Charged via internal diode from VCC; powers HS-FET gate driver; requires 0.1 µF ceramic capacitor to SW. |
| 18 VCC | Internal LDO output | Regulated ~5.5V output (up to 7.2V VIN); powers internal circuitry; requires local 0.1–1 µF decoupling. |
| 19 EN | Enable/UVLO input | 1.25V typical enable threshold with 50 mV hysteresis; supports precision input-voltage sequencing via resistor divider. |
| 20 RT | Oscillator frequency set | Bias voltage fixed at 550 mV; external resistor to AGND programs switching frequency from 100 kHz to 1 MHz. |
| EP | Exposed pad | Internally weakly tied to GND; must be soldered to large PCB ground plane for thermal performance (θJA = 30°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Non-linear slope compensation | Parabolic ramp adapts to output voltage level, eliminating subharmonic oscillation across full VOUT range without manual tuning. |
| Pre-biased startup support | Prevents sinking current during startup when output is already biased; avoids damaging parasitic paths in multi-rail FPGA/ASIC systems. |
| Diode emulation mode | Disables LS-FET at zero inductor current to eliminate reverse conduction loss, improving light-load efficiency below ~100 mA. |
| Programmable soft-start | External capacitor on SS/TRK pin sets monotonic ramp time; default 1 ms internal ramp activates if pin left floating. |
| Integrated OVP & UVP monitoring | Detects overvoltage (110% VFB) and undervoltage (95% VFB) events independently; triggers PGOOD deassertion and FET shutdown. |
Applications
| FPGA Core Supply | DSP Power Management |
|---|---|
Use Scenario: Regulating 1.2V core voltage for Xilinx Artix-7 FPGA with dynamic current demand up to 1.8A. IC Role / Device Role / Timing Role: Primary synchronous buck converter delivering tightly regulated, low-noise DC power with fast transient response. Use Value: Pre-biased startup prevents damage during hot-swap configuration; PGOOD enables FPGA configuration lockstep with system controller. |
Use Scenario: Powering TI C6000 DSP I/O and memory rails in baseband processing units. IC Role / Device Role / Timing Role: Secondary buck regulator tracking main 3.3V rail using SS/TRK pin for synchronized voltage ramp. Use Value: Tracking capability ensures safe power-up sequencing; diode emulation extends battery life in portable test equipment. |
| Automotive Infotainment | Industrial PLC I/O Module |
Use Scenario: Converting 12V vehicle battery to 1.8V for ARM-based multimedia SoC in head-unit design. IC Role / Device Role / Timing Role: High-reliability DC-DC stage operating across -40°C to +125°C junction temperature range. Use Value: 36V max input withstands load-dump transients; thermal shutdown with 20°C hysteresis prevents latch-up during extended high-temp operation. |
Use Scenario: Generating isolated 5V logic supply from 24V industrial bus in DIN-rail mounted controller. IC Role / Device Role / Timing Role: Input-stage buck regulator feeding downstream isolated DC-DC converters. Use Value: Wide 4.5V–36V input range accommodates brownout and surge conditions; HTSSOP-EP package enables compact, fanless enclosure design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM20243MHE/NOPB | Higher 3A output rating; identical pinout and feature set; shares same compensation architecture and protection schemes. | Required where peak load currents exceed 2A or long-term reliability margin is critical above 1.8A continuous. | Select LM20243MHE/NOPB when future-proofing for higher current or when operating near thermal limits of LM20242MHE/NOPB. |
| TPS54240DGQ | 4.5V–42V input, 2A output; uses voltage-mode control; no pre-biased startup or diode emulation; different pinout and compensation method. | Suitable for cost-sensitive designs where light-load efficiency is secondary and simpler compensation is preferred. | Choose TPS54240DGQ only when board redesign is acceptable and pre-bias/startup sequencing is not required. |
Compared with LM20242MHE/NOPB, LM20243MHE/NOPB offers higher current headroom with drop-in compatibility, while TPS54240DGQ trades advanced features like pre-bias support and adaptive slope compensation for lower BOM cost and simpler loop design-making it viable only in non-sequencing, non-prebiased applications.
Availability
LM20242MHE/NOPB is available at Aetrix Electronics and suitable for FPGA core supplies, DSP power management, automotive infotainment systems, and industrial PLC I/O modules requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM20242MHE/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 ICs, with decades of expertise in high-reliability power conversion solutions.
The LM20242MHE/NOPB belongs to TI's PowerWise® synchronous buck regulator family, engineered for high-efficiency, low-noise point-of-load regulation in space-constrained industrial, automotive, and communications systems.
FAQ
What is the maximum input voltage rating for LM20242MHE/NOPB?
The absolute maximum input voltage for LM20242MHE/NOPB is +38V, but its specified operating range is +4.5V to +36V. Operation within this 4.5V–36V range ensures guaranteed performance across temperature and load conditions per the datasheet's Electrical Characteristics table. Exceeding 36V may trigger internal OVP or cause reliability degradation even if below the 38V absolute limit.
Does LM20242MHE/NOPB support pre-biased output startup?
Yes, LM20242MHE/NOPB supports pre-biased startup: it will not sink current from a pre-charged output until the internal soft-start ramp exceeds the FB pin voltage. This behavior protects downstream loads-such as FPGAs or ASICs-with parasitic conduction paths during power-up, and is explicitly confirmed in the Operation Description section of the SNVS534E datasheet.
How is the switching frequency programmed on LM20242MHE/NOPB?
The switching frequency of LM20242MHE/NOPB is set by an external resistor (RRT) connected between the RT pin and AGND. With RRT = 49.9 kΩ, typical frequency is 750 kHz; with RRT = 249 kΩ, it drops to 250 kHz. Equation 8 in the datasheet defines the exact relationship: fSW (kHz) ≈ 1.1 × 10⁶ / RRT (kΩ), enabling precise selection from 100 kHz to 1 MHz.
What is the purpose of the SS/TRK pin on LM20242MHE/NOPB?
The SS/TRK pin on LM20242MHE/NOPB serves dual functions: soft-start control and voltage tracking. As SS, it accepts an external capacitor to set monotonic output ramp time; as TRK, it follows an external voltage ramp for coordinated power sequencing. The internal 5 µA current source and low-impedance input make it compatible with both modes without additional active circuitry.
Can LM20242MHE/NOPB operate in discontinuous conduction mode (DCM)?
Yes, LM20242MHE/NOPB automatically enters diode emulation mode-functionally equivalent to DCM-at light loads, disabling the low-side FET when inductor current reaches zero. This eliminates reverse conduction losses and improves efficiency below ~100 mA. The transition is seamless and does not require external control, as confirmed in the Light Load Operation section of the datasheet.
LM20242MHE/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
LM20242MHE/NOPB FAQ
1.How can I place an order for LM20242MHE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM20242MHE/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 LM20242MHE/NOPB reliable?
The price and inventory of LM20242MHE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM20242MHE/NOPB is usually 5 days.
3.What payment methods are accepted for LM20242MHE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM20242MHE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM20242MHE/NOPB?
LM20242MHE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM20242MHE/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 LM20242MHE/NOPB?
For technical support, including LM20242MHE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM20242MHE/NOPB requirements.
6.How does Aetrix verify that LM20242MHE/NOPB is sourced from the original manufacturer or authorized distributors?
All LM20242MHE/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 LM20242MHE/NOPB meets industry standards.
7.What is the process for return or replacement of LM20242MHE/NOPB?
All LM20242MHE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM20242MHE/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 LM20242MHE/NOPB part is unused and in its original packaging.
Return procedure for LM20242MHE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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