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Texas Instruments LM20242MH/NOPB
- Part No.:
- LM20242MH/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM20242MH/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:214
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Product details
Overview
LM20242MH/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 stable point-of-load regulation for FPGA, DSP, and ASIC core supplies in industrial and automotive systems.
For engineers reviewing the LM20242MH/NOPB datasheet, LM20242MH/NOPB pinout, LM20242MH/NOPB application, or LM20242MH/NOPB equivalent, key selection criteria include its 4.5–36V input range, pre-biased startup capability, diode emulation mode for light-load efficiency, and HTSSOP-20 exposed-pad thermal performance.
Technical Context
The LM20242MH/NOPB implements peak current-mode control with non-linear (parabolic) slope compensation to maintain stability across output voltages from 0.8V to VIN−2V. Its externally compensated error amplifier uses two components to set crossover frequency and optimize transient response.
It integrates dual N-channel MOSFETs (130 mΩ high-side, 110 mΩ low-side), precision 0.8V reference, programmable soft-start via SS/TRK pin, and PGOOD with 20 µs deglitching. Protection includes cycle-by-cycle current limiting (3.7A typical), thermal shutdown at 170°C, OVP (110% VFB), and UVLO with 3.9V threshold and 200 mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous; supports high-current digital loads without external MOSFETs. |
| Input Voltage Range | 4.5V to 36V; enables direct regulation from 12V/24V industrial or automotive buses. |
| Feedback Reference | 0.8V ±1.5%; allows precise output setting down to 0.8V using standard resistor dividers. |
| Switching Frequency | Programmable 100 kHz–1 MHz via RT-to-AGND resistor; balances size (inductor/capacitor) vs. efficiency. |
| Quiescent Current | 3 mA typical at full load; maintains high efficiency across wide load range. |
| Thermal Resistance | θJA = 30°C/W (0 LFM); enabled by HTSSOP-20 exposed pad for PCB heat sinking. |
| Current Limit | 3.7A peak (typical); provides robust short-circuit protection while supporting 2A steady-state operation. |
Pinout & Package
LM20242MH/NOPB is housed in a thermally enhanced HTSSOP-20 package with exposed pad (EP), requiring solder connection to PCB ground plane for optimal thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SS/TRK | Soft-start/Tracking control | 5 µA internal current source charges external capacitor; enables monotonic startup or rail tracking. |
| 2 FB | Feedback input | Connects to resistor divider; referenced to internal 0.8V bandgap for output voltage regulation. |
| 3 PGOOD | Open-drain power-good indicator | Asserts high when VOUT is within ±5% of target; requires external pull-up for system sequencing. |
| 4 COMP | Error amplifier output / PWM input | Interface 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 IR drop and improve high-current routing. |
| 7,8,13,14 SW | Switch node | Drain of high-side FET and source of low-side FET; connects directly to inductor and bootstrap capacitor. |
| 9,10,11 GND | Power ground | Reference for internal power MOSFETs; tied to EP for thermal conduction. |
| 12 AGND | Analog ground | Reference for control circuitry (error amp, oscillators, comparators); must be star-connected to minimize noise. |
| 17 BOOT | Bootstrap supply | Charged via internal diode from VCC; powers high-side gate driver (SW-to-BOOT capacitor required). |
| 18 VCC | Internal LDO output | Regulated ~5.5V output (up to 7.2V input); powers internal logic and gate drivers; requires 0.1–1 µF decoupling. |
| 19 EN | Enable with hysteresis | 1.25V enable threshold with 50 mV hysteresis; supports precise UVLO via external resistor divider. |
| 20 RT | Oscillator frequency adjust | Bias voltage fixed at 550 mV; sets fSW via resistor to AGND (e.g., 49.9 kΩ → ~750 kHz). |
| EP | Exposed thermal pad | Weakly connected to GND; must be soldered to large PCB copper area for θJA ≤30°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Diode emulation mode | Disables reverse current conduction at light loads (<100 mA), eliminating negative inductor current and improving efficiency. |
| Pre-biased startup support | Prevents output sinking during startup when VOUT > 0V; essential for multi-rail FPGA/ASIC systems with parasitic coupling. |
| Non-linear slope compensation | Parabolic ramp adapts to output voltage level, ensuring stable current-mode control across full VOUT range (0.8V–34V). |
| Programmable soft-start | External capacitor on SS/TRK sets ramp time; avoids input inrush and enables controlled power sequencing with PGOOD. |
| Integrated protection suite | Includes OVP (110% VFB), thermal shutdown (170°C), cycle-by-cycle current limit, and UVLO - no external ICs needed. |
Applications
| Industrial PLC Power Rails | FPGA Core Supply |
|---|---|
Use Scenario: Regulating 1.2V/1.8V core rails from 24V factory bus in programmable logic controllers. IC Role / Device Role / Timing Role: Primary synchronous buck converter delivering 2A continuous current with tight transient response. Use Value: Diode emulation mode sustains >88% efficiency at 100 mA load; HTSSOP-20 EP reduces board temperature rise by 22°C vs. non-exposed packages. |
Use Scenario: Powering Xilinx Artix-7 or Intel Cyclone V FPGA cores requiring monotonic 1.0V startup with pre-bias tolerance. IC Role / Device Role / Timing Role: Point-of-load regulator with SS/TRK tracking and PGOOD sequencing for configuration-safe power-up. Use Value: Pre-biased startup prevents damage from parasitic backfeed; 1.5% VOUT accuracy ensures reliable I/O voltage margining. |
| Automotive ADAS Camera Modules | Telecom Baseband Processors |
Use Scenario: Generating 1.1V processor supply in 12V automotive camera ECU with wide ambient temperature range. IC Role / Device Role / Timing Role: High-reliability buck regulator operating from cold-crank (4.5V) to load-dump (36V) conditions. Use Value: Integrated OVP/UVLO and thermal shutdown meet AEC-Q100 stress requirements; 125°C junction rating supports under-hood placement. |
Use Scenario: Supplying 1.8V/2.5V rails for LTE baseband SoCs in remote radio units with strict ripple and EMI limits. IC Role / Device Role / Timing Role: Low-noise, high-frequency (800 kHz) buck converter minimizing filter component size. Use Value: Resistor-programmable fSW avoids AM band interference; ceramic-friendly design achieves <5 mVPP ripple at 2A. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM25085QMYX/NOPB | 4.5–42V input, 1.5A output, no integrated low-side FET (external diode required); lacks PGOOD and soft-start. | Suitable for cost-sensitive 12V systems where 1.5A suffices and sequencing is not required. | Select when lower BOM count is prioritized over full integration and advanced features. |
| TPS54240DGQR | 3.5–42V input, 2A output, 500 kHz fixed frequency, no diode emulation or pre-bias startup. | Preferred for designs needing tighter EMI control via fixed fSW, but unable to tolerate pre-biased outputs. | Choose if fixed-frequency operation simplifies EMI filtering and thermal constraints allow non-exposed package. |
Compared with LM20242MH/NOPB, LM25085QMYX/NOPB trades integration for cost and voltage range, while TPS54240DGQR sacrifices adaptive light-load behavior and rail-tracking capability for deterministic EMI profile - neither offers identical combination of pre-bias tolerance, diode emulation, and exposed-pad thermal performance.
Availability
LM20242MH/NOPB is available at Aetrix Electronics and suitable for industrial PLCs, automotive ADAS modules, FPGA power delivery, telecom baseband processors, and embedded computing platforms requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM20242MH/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 DC-DC conversion.
The LM20242MH/NOPB belongs to TI's PowerWise® synchronous buck regulator family, engineered for high-efficiency, multi-rail power delivery in space-constrained industrial and automotive applications where thermal performance and startup robustness are critical.
FAQ
What is the maximum input voltage rating for the LM20242MH/NOPB?
The LM20242MH/NOPB has an absolute maximum input voltage rating of +38V, with recommended operating range from +4.5V to +36V. Operation above 36V risks exceeding safe operating area limits of internal MOSFETs and may trigger overvoltage protection. The device is designed for 24V industrial and 12V automotive systems with load-dump transients.
Does the LM20242MH/NOPB support pre-biased output startup?
Yes, the LM20242MH/NOPB supports pre-biased startup: when VOUT > 0V at power-on, it will not sink current until the soft-start ramp exceeds the FB pin voltage. This prevents damage to downstream loads like FPGAs or ASICs with parasitic conduction paths, making LM20242MH/NOPB suitable for multi-rail sequencing applications.
How is the switching frequency set on the LM20242MH/NOPB?
The LM20242MH/NOPB switching frequency is set by connecting a resistor (RRT) between the RT pin and AGND. With RRT = 49.9 kΩ, fSW ≈ 750 kHz; with RRT = 249 kΩ, fSW ≈ 250 kHz. The RT pin maintains a fixed 550 mV bias, enabling predictable frequency programming across temperature and input voltage.
What thermal performance can be expected from the LM20242MH/NOPB in a standard PCB layout?
With the exposed pad (EP) soldered to a 2-in² internal ground plane and 2 oz copper, the LM20242MH/NOPB achieves θJA ≈ 30°C/W (0 LFM). At 2A load and 12V input, junction temperature rise remains below 60°C - well within the −40°C to +125°C operating range. Thermal derating begins above 100°C junction.
Can the LM20242MH/NOPB operate in discontinuous conduction mode (DCM)?
Yes, the LM20242MH/NOPB automatically enters diode emulation mode in light-load DCM, disabling reverse current flow through the low-side FET. This eliminates negative inductor current and improves efficiency below ~100 mA. At very light loads, pulse-skipping further reduces switching losses while maintaining regulation.
LM20242MH/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- PowerWise®
- Package/Case:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
LM20242MH/NOPB FAQ
1.How can I place an order for LM20242MH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM20242MH/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 LM20242MH/NOPB reliable?
The price and inventory of LM20242MH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM20242MH/NOPB is usually 5 days.
3.What payment methods are accepted for LM20242MH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM20242MH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM20242MH/NOPB?
LM20242MH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM20242MH/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 LM20242MH/NOPB?
For technical support, including LM20242MH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM20242MH/NOPB requirements.
6.How does Aetrix verify that LM20242MH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM20242MH/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 LM20242MH/NOPB meets industry standards.
7.What is the process for return or replacement of LM20242MH/NOPB?
All LM20242MH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM20242MH/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 LM20242MH/NOPB part is unused and in its original packaging.
Return procedure for LM20242MH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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