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Texas Instruments LM21212MHE-2/NOPB
- Part No.:
- LM21212MHE-2/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM21212MHE-2/NOPB.pdf
- Description:
- IC REG BUCK ADJ 12A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:266
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Product details
Overview
LM21212MHE-2/NOPB from Texas Instruments is a monolithic voltage-mode synchronous buck regulator delivering up to 12 A continuous output current with 0.6 V to VIN adjustable output, integrated 7-mΩ high-side and 4.3-mΩ low-side MOSFETs, 300 kHz–1.55 MHz resistor-adjustable switching frequency, and ±1% reference accuracy - used for point-of-load regulation in FPGA and ASIC power supplies.
For engineers reviewing the LM21212MHE-2/NOPB datasheet, LM21212MHE-2/NOPB pinout, LM21212MHE-2/NOPB application, or LM21212MHE-2/NOPB equivalent, key selection criteria include input voltage range (2.95 V–5.5 V), thermal performance in HTSSOP-20 with exposed pad, startup into prebiased loads, PGOOD monitoring, and voltage tracking via SS/TRK pin.
Technical Context
The LM21212MHE-2/NOPB implements voltage-mode control with trailing-edge PWM modulation, enabling stable operation across wide output voltage ranges and compatibility with all output capacitor types. Its error amplifier delivers 95 dB open-loop gain and 11 MHz gain-bandwidth product for fast transient response.
Internal protection includes cycle-by-cycle overcurrent detection with 17 A rising threshold (ICLR) and 12 A falling threshold (ICLF), programmable soft-start via external capacitor on SS/TRK, precision enable with 1.35 V turn-on threshold and 110 mV hysteresis, and open-drain PGOOD with 15 µs deglitch timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 12 A continuous - supports high-power FPGAs and microprocessors without external current sharing. |
| Input Voltage Range | 2.95 V to 5.5 V - compatible with standard 3.3 V and 5 V intermediate bus architectures. |
| Output Voltage Range | 0.6 V to VIN - enables low-voltage core rails (e.g., 1.2 V, 0.85 V) and 100% duty-cycle operation for LDO-like dropout. |
| Switching Frequency | 300 kHz to 1.55 MHz - adjustable via FADJ resistor; higher frequencies allow smaller inductors and faster transient response. |
| Reference Accuracy | ±1% at TJ = −40°C to +125°C - ensures tight output regulation under full temperature and load conditions. |
| HS/LS RDS(on) | 7 mΩ / 4.3 mΩ at 12 A - minimizes conduction losses and enables >95% peak efficiency at 5 VIN/1.2 VOUT. |
| Thermal Shutdown | 165°C with 10°C hysteresis - protects die during sustained overload or poor PCB thermal design. |
Pinout & Package
LM21212MHE-2/NOPB is housed in a thermally enhanced 20-pin HTSSOP package (6.50 mm × 4.40 mm) with an exposed pad electrically and thermally connected to PGND. The exposed pad must be soldered to the PCB ground plane to achieve θJA = 24°C/W and sustain full 12 A output current.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FADJ | Frequency adjust input | Connects to AGND via resistor to set switching frequency between 300 kHz and 1.55 MHz. |
| 2 SS/TRK | Soft-start and tracking control | Charged by 2 µA internal current source; enables controlled ramp-up or external rail tracking. |
| 3 EN | Enable input | Active-high logic input with 1.35 V threshold and 110 mV hysteresis; internally pulled up if left floating. |
| 4 AVIN | Analog supply input | Powers internal bias circuitry; should be filtered from PVIN to reduce noise coupling into control loop. |
| 5–7 PVIN | Power switch input | High-current input pins tied together near device; require low-ESR bulk capacitance for stability. |
| 8–10 PGND | Power ground return | Low-impedance return path for high-side/low-side switch currents; separate from AGND to minimize noise. |
| 11–16 SW | Switch node outputs | Connect directly to inductor; multiple pins reduce trace inductance and improve thermal spreading. |
| 17 PGOOD | Open-drain power-good flag | Asserts low on OVP/UVP, EN deactivation, or prebiased startup; requires external pullup to monitored rail. |
| 18 COMP | Error amplifier output | Connects to external RC compensation network to stabilize voltage loop across operating conditions. |
| 19 FB | Feedback input | Monitors output via resistive divider; referenced to precise 0.6 V internal bandgap voltage. |
| 20 AGND | Analog ground reference | Quiet ground for reference, error amp, and bias circuits; must be isolated from noisy PGND planes. |
| EP | Exposed thermal pad | Electrically tied to PGND; mandatory connection to PCB ground plane for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated power stage | 7-mΩ HS and 4.3-mΩ LS MOSFETs eliminate external gate drivers and reduce BOM count and layout complexity. |
| Prebias startup capability | Does not sink current during startup - prevents output voltage collapse when powering already-charged rails. |
| Voltage tracking support | SS/TRK pin enables coordinated sequencing with other regulators via external voltage ramp or reference. |
| Comprehensive fault protection | OVP, UVP, OCP, UVLO, OTP, and short-circuit reset ensure robust operation in mission-critical systems. |
| WEBENCH® integration | Fully supported in TI's WEBENCH Power Designer for automated schematic generation, efficiency simulation, and BOM export. |
Applications
| High-Performance FPGA Power | ASIC Core Voltage Regulation |
|---|---|
|
Use Scenario: Powers Xilinx Kintex or Intel Stratix FPGA core rails requiring 1.2 V @ 10–12 A with tight transient response. IC Role / Device Role / Timing Role: Primary synchronous buck converter delivering regulated core voltage; operates in CCM with 500 kHz–1 MHz switching. Use Value: Integrated 7-mΩ/4.3-mΩ FETs and wide bandwidth error amplifier enable <5% output deviation during 6-A step transients. |
Use Scenario: Supplies 0.85 V core voltage to multi-core SoCs in networking processors with strict power sequencing requirements. IC Role / Device Role / Timing Role: Point-of-load regulator with SS/TRK pin configured for voltage tracking during power-up/down sequences. Use Value: Precision enable threshold (1.35 V) and UVLO hysteresis (200 mV) ensure deterministic, glitch-free rail activation. |
| 5 V Bus to 3.3 V/2.5 V Conversion | Industrial Embedded System PMU |
|
Use Scenario: Converts 5 V intermediate bus to 3.3 V I/O rail in industrial PLC modules with space-constrained PCB layouts. IC Role / Device Role / Timing Role: High-efficiency buck regulator operating at 1.2 MHz to minimize inductor size and footprint. Use Value: 300 kHz–1.55 MHz frequency adjustability allows optimization for EMI compliance while maintaining >92% efficiency at full load. |
Use Scenario: Serves as main DC-DC stage in ruggedized edge computing gateway requiring long-term reliability and thermal resilience. IC Role / Device Role / Timing Role: Primary power converter with PGOOD monitoring feeding system supervisor IC for fault logging and recovery. Use Value: Thermal shutdown (165°C) and 125°C max junction rating support operation in sealed enclosures up to 85°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS544B20RHLT | 4.5–18 V input range; 15 A rated; uses current-mode control; no integrated tracking function. | Better suited for higher-input industrial buses; lacks SS/TRK-based voltage tracking capability. | Select when input exceeds 5.5 V or when current-mode control is preferred for multi-phase synchronization. |
| MP2315GJ-Z | 2.5–16 V input; 12 A rated; fixed 500 kHz frequency; no FADJ or SS/TRK pins; smaller QFN-12 package. | Limited flexibility in frequency tuning and sequencing; lower thermal performance due to smaller package and no exposed pad. | Choose for cost-sensitive, space-constrained designs where adjustable frequency and tracking are unnecessary. |
Compared with TPS544B20RHLT and MP2315GJ-Z, the LM21212MHE-2/NOPB uniquely combines 2.95–5.5 V input compatibility, resistor-adjustable frequency, analog voltage tracking, and thermally optimized HTSSOP-20 packaging - making it optimal for low-voltage, high-current, sequenced FPGA/ASIC power delivery.
Availability
LM21212MHE-2/NOPB is available at Aetrix Electronics and suitable for high-performance FPGA power, ASIC core regulation, and industrial embedded system PMU applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM21212MHE-2/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 over 50 years of innovation in high-reliability power conversion solutions.
The LM21212MHE-2/NOPB belongs to TI's LM21212 family of monolithic synchronous buck regulators designed specifically for high-current, low-voltage point-of-load applications in communications infrastructure, computing, and industrial automation.
FAQ
What is the maximum continuous output current supported by the LM21212MHE-2/NOPB?
The LM21212MHE-2/NOPB supports up to 12 A of continuous output current when properly heatsinked using the exposed pad and adhering to recommended PCB layout guidelines. This rating assumes operation within the specified input voltage range (2.95 V–5.5 V), junction temperature limit (−40°C to +125°C), and thermal resistance (θJA = 24°C/W). Derating applies above 85°C ambient.
Does the LM21212MHE-2/NOPB support startup into a prebiased output?
Yes, the LM21212MHE-2/NOPB supports startup into prebiased outputs. During startup, it does not sink current from the output rail, allowing the voltage to rise smoothly past the precharged level without causing a dip or oscillation. This behavior is confirmed in the datasheet's Figure 14 and Section 8.3.4, and is enabled by internal control logic that disables low-side conduction until the feedback voltage crosses the soft-start threshold.
How is the switching frequency adjusted on the LM21212MHE-2/NOPB?
The switching frequency of the LM21212MHE-2/NOPB is adjusted using an external resistor connected between the FADJ pin and AGND. The frequency scales inversely with resistance: 95.3 kΩ sets ~500 kHz, while 22.6 kΩ sets ~1.55 MHz. The full range is 300 kHz to 1.55 MHz, and the relationship is characterized in Section 7.4 of the datasheet with typical values provided for common resistor values.
What protection features are integrated into the LM21212MHE-2/NOPB?
The LM21212MHE-2/NOPB integrates overvoltage protection (OVP), undervoltage protection (UVP), overcurrent protection (OCP) with rising/falling thresholds, thermal shutdown (165°C), input undervoltage lockout (UVLO), and short-circuit reset functionality. All protections are fully autonomous and do not require external components - for example, OCP triggers a soft-start reset after tRESETSS (~110 µs), and PGOOD asserts low during any fault condition.
Can the LM21212MHE-2/NOPB be used in voltage-tracking configurations?
Yes, the LM21212MHE-2/NOPB supports voltage tracking via its SS/TRK pin. When configured with an external ramp generator or connected to another regulator's reference, it synchronizes its output voltage ramp during startup/shutdown. Tracking accuracy is specified as ±20 mV (VSS − VFB) across temperature, enabling precise sequencing in multi-rail systems such as those powering FPGAs with auxiliary and core supplies.
LM21212MHE-2/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- 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):
- 2.95V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 12A
- Frequency - Switching:
- 300kHz ~ 1.55MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
LM21212MHE-2/NOPB FAQ
1.How can I place an order for LM21212MHE-2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM21212MHE-2/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 LM21212MHE-2/NOPB reliable?
The price and inventory of LM21212MHE-2/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM21212MHE-2/NOPB is usually 5 days.
3.What payment methods are accepted for LM21212MHE-2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM21212MHE-2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM21212MHE-2/NOPB?
LM21212MHE-2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM21212MHE-2/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 LM21212MHE-2/NOPB?
For technical support, including LM21212MHE-2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM21212MHE-2/NOPB requirements.
6.How does Aetrix verify that LM21212MHE-2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM21212MHE-2/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 LM21212MHE-2/NOPB meets industry standards.
7.What is the process for return or replacement of LM21212MHE-2/NOPB?
All LM21212MHE-2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM21212MHE-2/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 LM21212MHE-2/NOPB part is unused and in its original packaging.
Return procedure for LM21212MHE-2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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