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Texas Instruments LM21212MHX-1/NOPB
- Part No.:
- LM21212MHX-1/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM21212MHX-1/NOPB.pdf
- Description:
- IC REG BUCK ADJ 12A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,048
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Product details
Overview
LM21212MHX-1/NOPB from Texas Instruments is a monolithic synchronous buck regulator delivering up to 12 A continuous output current with 0.6 V to VIN adjustable output, ±1% reference accuracy, integrated 7-mΩ high-side and 4.3-mΩ low-side FETs, and voltage-mode control optimized for 2.95–5.5 V input rails in FPGA/ASIC point-of-load applications.
For engineers reviewing the LM21212MHX-1/NOPB datasheet, LM21212MHX-1/NOPB pinout, LM21212MHX-1/NOPB application, or LM21212MHX-1/NOPB equivalent, key selection considerations include its 300 kHz–1.5 MHz frequency synchronization capability, prebiased startup support, output voltage tracking via SS/TRK pin, and thermally enhanced HTSSOP-20 exposed-pad package for high-current DC/DC conversion.
Technical Context
The LM21212MHX-1/NOPB implements voltage-mode PWM control with trailing-edge modulation, enabling stable operation across wide output voltage ranges and compatibility with any output capacitance type. 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 (15–19 A rising HS limit), thermal shutdown at 165°C with 10°C hysteresis, and precision power-good monitoring with 15 µs deglitching. The SYNC pin synchronizes switching to an external clock's falling edge, while the SS/TRK pin supports both soft-start ramp control and external voltage rail tracking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 12 A continuous - supports high-power FPGA, ASIC, and microprocessor core rails without external current sharing. |
| Input Voltage Range | 2.95 V to 5.5 V - compatible with standard 3.3 V and 5 V intermediate distribution buses. |
| Output Voltage Accuracy | ±1% at FB pin - ensures tight regulation of low-voltage outputs (e.g., 0.85 V, 1.0 V, 1.2 V) critical for digital logic stability. |
| Switching Frequency | 300 kHz to 1.5 MHz (SYNC-controlled) - enables optimization of inductor size, efficiency, and EMI profile per system requirements. |
| High-Side RDS(on) | 7 mΩ max - minimizes conduction loss at full load, supporting >90% peak efficiency at 12 A with 5 V input / 1.2 V output. |
| Low-Side RDS(on) | 4.3 mΩ max - reduces synchronous rectification losses and improves light-load efficiency via diode emulation mode. |
| Reference Voltage | 0.6 V ±1% - sets minimum programmable output; used with external resistor divider to configure target VOUT. |
| Thermal Resistance θJA | 24 °C/W - achieved with HTSSOP-20 exposed pad soldered to PCB ground plane; enables 12 A operation without forced air. |
Pinout & Package
LM21212MHX-1/NOPB is housed in a thermally enhanced HTSSOP-20 package (6.50 mm × 4.40 mm) with exposed pad electrically and thermally connected to PGND. The exposed pad must be soldered to a PCB ground plane for optimal thermal dissipation and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SYNC) | Frequency synchronization input | Accepts external clock (300 kHz–1.5 MHz); forces HS switch turn-on on falling edge - eliminates beat frequencies in multi-rail systems. |
| 2 (SS/TRK) | Soft-start and tracking control | 2 µA internal current source charges external capacitor for controlled VOUT ramp; also accepts external voltage for supply sequencing. |
| 3 (EN) | Enable input with hysteresis | Active-high logic threshold (1.35 V typ., 110 mV hysteresis); internal pull-up allows floating for always-on operation. |
| 4 (AVIN) | Analog bias supply | Powers internal reference and error amplifier; requires RC filter from PVIN to suppress noise coupling into control loop. |
| 5–7 (PVIN) | Power input to internal FETs | Three parallel pins reduce IR drop and inductance; must be tied together near device with low-ESR input capacitors. |
| 8–10 (PGND) | Power ground return | Low-impedance path for switch currents; separate from AGND to prevent noise injection into analog circuitry. |
| 11–16 (SW) | Switch node connection | Six parallel pins connect to inductor; minimize trace inductance to reduce ringing and improve efficiency at high dI/dt. |
| 17 (PGOOD) | Open-drain power-good flag | Asserts high when VFB is within 82–120% of 0.6 V; requires external pull-up; deglitched for robust fault reporting. |
| 18 (COMP) | Error amplifier compensation | Connects to external RC network to set loop bandwidth and phase margin - enables stability with diverse output capacitors. |
| 19 (FB) | Voltage feedback input | Monitors resistive divider output; internal 0.6 V reference sets VOUT = 0.6 V × (1 + R1/R2). |
| 20 (AGND) | Analog ground reference | Quiet ground for reference, error amp, and bias circuits; must be star-connected to PGND at single point under exposed pad. |
| EP (Exposed Pad) | Thermal and electrical ground | Electrically tied to PGND; mandatory solder connection to PCB ground plane for thermal management and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-FET power stage | 7-mΩ HS and 4.3-mΩ LS MOSFETs eliminate external switch selection and gate drive design effort. |
| Prebiased output startup | Prevents reverse current flow during start-up into existing VOUT - essential for hot-swap and multi-rail sequencing. |
| Output voltage tracking | SS/TRK pin accepts external ramp or voltage to coordinate power-up/down with other rails - simplifies complex supply sequencing. |
| Wide bandwidth error amplifier | 11 MHz GBW and 95 dB gain enable fast transient response (<10 µs recovery) for processor load steps. |
| Comprehensive protection suite | OVP/UVP (±12.5% FB window), OCP (15–19 A), OTP (165°C), UVLO (2.7 V), and short-circuit reset - reduces need for external supervision ICs. |
| Diode emulation mode | Disables LS FET at light loads to prevent reverse inductor current - maintains >85% efficiency down to 100 mA output. |
Applications
| Telecom Baseband Processing | FPGA Core Power Delivery |
|---|---|
Use Scenario: Powering multi-core baseband processors in 4G/5G remote radio units requiring tight voltage tolerance and dynamic load response. IC Role / Device Role / Timing Role: Primary point-of-load regulator converting 5 V bus to 0.85 V/12 A core supply with synchronized switching to avoid interference with RF front-end clocks. Use Value: 12 A capability and 11 MHz error amplifier bandwidth ensure sub-10 µs transient recovery during burst-mode processing, maintaining signal integrity. | Use Scenario: Supplying configurable logic blocks and DSP slices in high-end Xilinx/Intel FPGAs where voltage margin and sequencing are critical. IC Role / Device Role / Timing Role: Core voltage regulator with SS/TRK pin tracking auxiliary I/O bank supplies during power-up to meet FPGA vendor sequencing requirements. Use Value: ±1% output accuracy and programmable soft-start prevent configuration errors; tracking eliminates need for external sequencer ICs. |
| Industrial PLC CPU Modules | AI Accelerator Board Power |
Use Scenario: Delivering reliable 1.0 V/10 A power to ARM Cortex-A series CPUs in ruggedized programmable logic controllers operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Main DC/DC converter with thermal shutdown (165°C) and UVLO (2.7 V) ensuring fail-safe operation during brownouts or overheating events. Use Value: HTSSOP-20 exposed pad and 24 °C/W θJA enable full 12 A rating without heatsink - reducing BOM cost and board space in compact enclosures. | Use Scenario: Providing 0.75 V/12 A core voltage to edge AI inference accelerators (e.g., Google Coral, NVIDIA Jetson modules) with strict efficiency targets. IC Role / Device Role / Timing Role: High-efficiency buck regulator using diode emulation mode to sustain >88% efficiency at 200 mA idle current while delivering full power on demand. Use Value: Integrated 4.3-mΩ LS FET and light-load pulse-skipping reduce quiescent power - extending battery life in portable AI devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS544B25RQFT | 40-A capable, D-CAP3 control, 1.5-V to 16-V input, QFN-22 package | Higher current, wider input range, but larger footprint and higher complexity for lower-current designs | Choose TPS544B25RQFT only if >12 A output or >5.5 V input is required; LM21212MHX-1/NOPB offers simpler layout and lower cost for ≤12 A, ≤5.5 V use cases. |
| MP2315GJ-Z | 12-A rated, 4.5–28-V input, 500-kHz fixed frequency, QFN-12 package | Higher input voltage range but no SYNC, no tracking, and no prebias startup support | MP2315GJ-Z suits industrial 12–24 V systems; LM21212MHX-1/NOPB is preferred for 3.3/5 V bus systems needing synchronization, sequencing, and robust startup behavior. |
Compared with TPS544B25RQFT and MP2315GJ-Z, LM21212MHX-1/NOPB provides superior integration for low-voltage, high-current point-of-load applications - including dedicated tracking, prebias startup, and 300 kHz–1.5 MHz synchronization - in a compact HTSSOP-20 package with proven thermal performance at 12 A.
Availability
LM21212MHX-1/NOPB is available at Aetrix Electronics and suitable for telecom infrastructure, FPGA-based embedded systems, and industrial automation equipment requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM21212MHX-1/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 LM21212MHX-1/NOPB belongs to TI's point-of-load buck regulator product line, engineered specifically for high-current, low-voltage digital supply applications in networking, computing, and industrial systems where efficiency, thermal performance, and feature integration are critical.
FAQ
What is the recommended input capacitor configuration for LM21212MHX-1/NOPB?
TI recommends placing low-ESR ceramic capacitors totaling ≥47 µF directly across the PVIN and PGND pins (pins 5–7 and 8–10), with at least three 22-µF 0805 X5R/X7R devices distributed near the package edges. This minimizes high-frequency switching noise and ensures stable operation under 12-A load transients. The LM21212MHX-1/NOPB datasheet specifies that input capacitance must be located as close as possible to the PVIN pins to reduce loop inductance and prevent voltage overshoot.
Does LM21212MHX-1/NOPB support output voltage tracking, and how is it implemented?
Yes, LM21212MHX-1/NOPB supports output voltage tracking via the SS/TRK pin (pin 2). When an external voltage ramp is applied to this pin, the FB node follows it until reaching the programmed output voltage, enabling coordinated power-up with other rails. Tracking accuracy is specified as ±20 mV (VSS – VFB) across 0–0.55 V range. This function is confirmed in the LM21212MHX-1/NOPB datasheet Section 8.3.2 and Figure 20.
What is the maximum junction temperature and thermal shutdown behavior of LM21212MHX-1/NOPB?
The LM21212MHX-1/NOPB triggers thermal shutdown at 165°C (typical) with 10°C hysteresis, resuming normal operation once junction temperature falls to ~155°C. This protects against catastrophic failure during sustained overload or poor PCB thermal design. The device's HTSSOP-20 exposed pad must be soldered to a thermal pad on the PCB to achieve the specified 24 °C/W θJA, as documented in LM21212MHX-1/NOPB Thermal Information Table 7.4.
Can LM21212MHX-1/NOPB start up into a prebiased output, and what happens during this condition?
Yes, LM21212MHX-1/NOPB supports prebiased startup: when VOUT is already present at power-on, the device does not sink current from the output, allowing smooth voltage ramping past the prebias level. During this event, PGOOD is pulled low (per Section 8.3.7), signaling the condition to system controllers. This behavior is explicitly verified in LM21212MHX-1/NOPB Figure 18 and described in Section 5 of the datasheet.
What are the absolute maximum ratings for the SW pin of LM21212MHX-1/NOPB?
The SW pin (pins 11–16) of LM21212MHX-1/NOPB has an absolute maximum rating of –1 V for 4 ns and +9 V for 6 ns during normal switching transients, as stated in Section 7.1 Absolute Maximum Ratings. Exceeding these limits risks permanent damage. Layout best practices - including minimizing SW node area and using ground planes - are essential to contain voltage spikes, and these values are validated in LM21212MHX-1/NOPB characterization testing.
LM21212MHX-1/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:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
LM21212MHX-1/NOPB FAQ
1.How can I place an order for LM21212MHX-1/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM21212MHX-1/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 LM21212MHX-1/NOPB reliable?
The price and inventory of LM21212MHX-1/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM21212MHX-1/NOPB is usually 5 days.
3.What payment methods are accepted for LM21212MHX-1/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM21212MHX-1/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM21212MHX-1/NOPB?
LM21212MHX-1/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM21212MHX-1/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 LM21212MHX-1/NOPB?
For technical support, including LM21212MHX-1/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM21212MHX-1/NOPB requirements.
6.How does Aetrix verify that LM21212MHX-1/NOPB is sourced from the original manufacturer or authorized distributors?
All LM21212MHX-1/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 LM21212MHX-1/NOPB meets industry standards.
7.What is the process for return or replacement of LM21212MHX-1/NOPB?
All LM21212MHX-1/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM21212MHX-1/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 LM21212MHX-1/NOPB part is unused and in its original packaging.
Return procedure for LM21212MHX-1/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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