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Texas Instruments LM21215MHE/NOPB
- Part No.:
- LM21215MHE/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM21215MHE/NOPB.pdf
- Description:
- IC REG BUCK ADJ 15A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,281
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Product details
Overview
LM21215MHE/NOPB from Texas Instruments is a monolithic voltage-mode synchronous buck regulator delivering up to 15 A continuous output current with 0.6 V to VIN adjustable output, integrated 7-mΩ high-side and 4.3-mΩ low-side FETs, fixed 500-kHz switching frequency, and precision enable with hysteresis - deployed in FPGA core power supplies requiring tight regulation and fast transient response.
For engineers reviewing the LM21215MHE/NOPB datasheet, LM21215MHE/NOPB pinout, LM21215MHE/NOPB application, or LM21215MHE/NOPB equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal and protection behavior, and real-world implementation constraints for point-of-load designs on 3.3-V/5-V buses.
Technical Context
The LM21215MHE/NOPB implements voltage-mode control with trailing-edge PWM modulation, enabling stable operation across all output voltages (0.6 V–VIN) and compatibility with any output capacitance type. Its wide-bandwidth error amplifier (95 dB open-loop gain, 11 MHz GBW) supports aggressive compensation for high-speed load transients.
It integrates programmable overcurrent protection via ILIM pin (resistor-set rising limit from 3.8 A to 23.5 A), dual-level current sensing (ICLR/ICLF), thermal shutdown at 165°C with 10°C hysteresis, and comprehensive fault monitoring including OVP/UVP on FB (±2% thresholds), UVLO on AVIN (2.7 V typ), and open-drain PGOOD with deglitch timing (15 µs low pulse).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.95 V to 5.5 V - supports direct regulation from standard 3.3-V and 5-V system rails without pre-regulation. |
| Output Current | Up to 15 A continuous - enables single-chip core supply for high-performance FPGAs and ASICs. |
| Switching Frequency | 500 kHz ±25 kHz - balances efficiency, inductor size, and EMI filtering requirements. |
| High-Side RDS(on) | 7 mΩ max at 12 A - reduces conduction loss and thermal stress in high-current paths. |
| Low-Side RDS(on) | 4.3 mΩ max at 12 A - minimizes synchronous rectification losses during freewheeling phase. |
| Reference Accuracy | ±1% over temperature - ensures output voltage stability under varying thermal and load conditions. |
| Soft-Start Ramp | Internally sourced 2 µA current into external CSS capacitor - enables controlled output ramp rate and prebias-safe startup. |
Pinout & Package
LM21215MHE/NOPB uses a thermally enhanced 20-pin HTSSOP package (6.50 mm × 4.40 mm) with exposed pad electrically and thermally connected to PGND. The exposed pad must be soldered to PCB ground plane for optimal thermal performance (θJA = 24°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (ILIM) | Current limit programming input | Resistor-to-ground sets rising current limit (ICLR) from 3.8 A to 23.5 A; shorting to AGND selects maximum limit. |
| 2 (SS/TRK) | Soft-start and tracking control | 2-µA internal current source charges external capacitor for soft-start; also accepts external reference for output voltage tracking. |
| 3 (EN) | Enable input with hysteresis | Active-high logic threshold (1.35 V typ, 110 mV hysteresis); internal 2-µA pullup allows open-circuit use. |
| 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 switch input | 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 high di/dt switch currents; separate from AGND to prevent noise injection into analog circuitry. |
| 11–16 (SW) | Switch node outputs | Six parallel pins connect to inductor; require local copper tie and minimal trace inductance to limit ringing and EMI. |
| 17 (PGOOD) | Open-drain power-good flag | Asserts high when VFB is within 2% of 0.6 V; pulls low on OVP/UVP, EN disable, or prebiased startup failure. |
| 18 (COMP) | Error amplifier output | Connects to external compensation network (CC1/CC2/CC3); sink/source capability supports Type II/III compensation. |
| 19 (FB) | Feedback input | High-impedance (1 nA bias) node referenced to 0.6 V; forms resistive divider with RFB1/RFB2 to set output voltage. |
| 20 (AGND) | Analog ground reference | Quiet ground for reference and error amplifier; must be separated from PGND and joined at single point near AVIN/AGND decoupling. |
| EP | Exposed thermal pad | Electrically tied to PGND; requires ≥12 thermal vias to inner/outer ground planes for effective heat dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high- and low-side FETs | Eliminates external MOSFET selection and gate drive design; reduces BOM count and layout complexity for 12–15 A PoL applications. |
| Adjustable output voltage (0.6 V–VIN) | Supports core voltages down to sub-1 V for modern processors/FPGAs while maintaining 100% duty cycle capability for LDO-like dropout. |
| Start-up into prebiased loads | Prevents reverse current flow during startup when output is already biased; avoids bus contention and inrush-induced system reset. |
| Output voltage tracking | Enables coordinated power sequencing with other rails using SS/TRK pin as slave input - critical for multi-rail SoC and memory interfaces. |
| Integrated protection suite | OVP/UVP on FB, AVIN UVLO with hysteresis, thermal shutdown, and short-circuit reset recovery - reduces need for external supervision ICs. |
Applications
| High-Performance FPGA Core Supply | ASIC I/O and Auxiliary Rail |
|---|---|
Use Scenario: Powering Xilinx Kintex or Intel Stratix core logic at 0.85 V/12 A with <100 mV transient droop under 8-A step load. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing tightly regulated core voltage with fast transient response and precise sequencing. Use Value: Integrated 7-mΩ/4.3-mΩ FETs and wide-bandwidth error amplifier achieve <50-µs recovery time and >92% peak efficiency at 12 A. |
Use Scenario: Generating 1.8-V I/O rail for FPGA banks with tracking to match core voltage ramp during power-up. IC Role / Device Role / Timing Role: Slave regulator synchronized via SS/TRK pin to track master core rail during startup and shutdown sequences. Use Value: SS/TRK pin accuracy (±20 mV) ensures <±1% tracking error between core and I/O rails, preventing latch-up or timing violations. |
| Networking Processor Point-of-Load | Industrial Embedded Microcontroller Supply |
Use Scenario: Delivering 1.1 V/10 A to Marvell ARMADA or Broadcom BCM58xx processors in 1U telecom equipment with strict thermal limits. IC Role / Device Role / Timing Role: High-current DC/DC converter operating from 5-V backplane with thermal foldback and PGOOD monitoring for system health reporting. Use Value: Exposed-pad HTSSOP package and 24°C/W θJA enable full 15-A operation without heatsink in 60°C ambient environments. |
Use Scenario: Regulating 3.3-V supply for TI Sitara AM62x or NXP i.MX 8M Mini in fanless industrial HMIs with extended temperature range. IC Role / Device Role / Timing Role: Robust buck converter with AVIN UVLO hysteresis (200 mV) and junction temp monitoring (−40°C to +125°C) for unattended operation. Use Value: Precision enable (1.35 V threshold, 110 mV hysteresis) allows clean power-on sequencing from battery-backed supervisor circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS543C20RTWR | 4.5–18-V input, 30-A capability, current-mode control, smaller 3.5-mm × 3.5-mm QFN package | Requires higher input voltage; better suited for 12-V intermediate bus vs. 5-V direct PoL | Select when input exceeds 5.5 V or higher current (>15 A) is needed; not drop-in due to different control architecture and pinout. |
| MP2315GJ-Z | 4.5–28-V input, 15-A rating, integrated compensation, no external ILIM or SS/TRK configuration | Lacks programmable current limit and voltage tracking; simpler but less flexible for multi-rail sequencing | Choose for cost-sensitive, single-rail 5-V-to-3.3-V conversion where advanced features like prebias startup or tracking are unnecessary. |
Compared with TPS543C20RTWR and MP2315GJ-Z, LM21215MHE/NOPB uniquely supports 2.95-V minimum input, prebias-safe startup, and resistor-programmable current limiting - making it the only option among the three qualified for low-voltage, multi-rail, high-reliability FPGA/ASIC core supplies.
Availability
LM21215MHE/NOPB is available at Aetrix Electronics and suitable for high-performance FPGA core supplies, ASIC auxiliary rails, and networking processor point-of-load applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM21215MHE/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 company specializing in analog, embedded processing, and power management technologies, with leadership in high-efficiency DC/DC conversion and system power architecture solutions.
LM21215MHE/NOPB belongs to TI's high-current synchronous buck regulator product line, designed specifically for demanding point-of-load applications in FPGA, ASIC, and microprocessor systems where low-voltage precision, thermal robustness, and sequencing flexibility are critical.
FAQ
What is the minimum input voltage supported by the LM21215MHE/NOPB?
The LM21215MHE/NOPB supports a minimum input voltage of 2.95 V, enabling direct regulation from low-voltage system rails such as 3.3-V buses without requiring a boost pre-regulator. This specification is guaranteed across the full operating temperature range (−40°C to +125°C) and is validated per TI's recommended operating ratings.
Does the LM21215MHE/NOPB support start-up into a prebiased output?
Yes, the LM21215MHE/NOPB supports safe start-up into a prebiased output. When the FB voltage exceeds the SS/TRK voltage at startup, the device disables sinking current from the output, allowing the voltage to rise smoothly past the prebias level without causing bus contention or damaging downstream components.
How is overcurrent protection configured on the LM21215MHE/NOPB?
Overcurrent protection on the LM21215MHE/NOPB is configured via an external resistor (RILIM) connected between the ILIM pin and AGND. This resistor sets the rising current limit (ICLR) from 3.8 A to 23.5 A; for example, a 16.5-kΩ resistor configures ICLR to 16.5–23.5 A depending on temperature and process variation.
What thermal performance can be expected from the LM21215MHE/NOPB in a standard PCB layout?
In a standard 4-layer PCB layout with twelve 8-mil vias under the exposed pad and proper copper pour, the LM21215MHE/NOPB achieves a junction-to-ambient thermal resistance (θJA) of 24°C/W. This allows full 15-A operation at up to 60°C ambient without forced airflow, assuming adequate input/output voltage margins and proper layout per TI's SNVS625G layout guidelines.
Can the LM21215MHE/NOPB be used for output voltage tracking in multi-rail systems?
Yes, the LM21215MHE/NOPB supports output voltage tracking via its SS/TRK pin. When an external voltage ramp is applied to this pin, the device regulates its output to follow that ramp with ±20 mV accuracy, enabling precise power sequencing between core and I/O rails in FPGAs and SoCs without additional supervisory ICs.
LM21215MHE/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:
- 15A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
LM21215MHE/NOPB FAQ
1.How can I place an order for LM21215MHE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM21215MHE/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 LM21215MHE/NOPB reliable?
The price and inventory of LM21215MHE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM21215MHE/NOPB is usually 5 days.
3.What payment methods are accepted for LM21215MHE/NOPB?
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Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM21215MHE/NOPB?
LM21215MHE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM21215MHE/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 LM21215MHE/NOPB?
For technical support, including LM21215MHE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM21215MHE/NOPB requirements.
6.How does Aetrix verify that LM21215MHE/NOPB is sourced from the original manufacturer or authorized distributors?
All LM21215MHE/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 LM21215MHE/NOPB meets industry standards.
7.What is the process for return or replacement of LM21215MHE/NOPB?
All LM21215MHE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM21215MHE/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 LM21215MHE/NOPB part is unused and in its original packaging.
Return procedure for LM21215MHE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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