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Texas Instruments LM21215AMHE-1/NOPB
- Part No.:
- LM21215AMHE-1/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM21215AMHE-1/NOPB.pdf
- Description:
- IC REG BUCK ADJ 15A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:429
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Product details
Overview
LM21215AMHE-1/NOPB from Texas Instruments is a voltage-mode synchronous buck DC/DC converter delivering up to 15 A output current with adjustable 0.6 V to VIN output voltage, operating from 2.95 V to 5.5 V input, featuring 300 kHz–1.5 MHz frequency synchronization and integrated 7-mΩ PMOS/4.3-mΩ NMOS power switches-used in FPGA core supplies and high-efficiency point-of-load conversion.
For engineers reviewing the LM21215AMHE-1/NOPB datasheet, LM21215AMHE-1/NOPB pinout, LM21215AMHE-1/NOPB application, or LM21215AMHE-1/NOPB equivalent, key selection considerations include its HTSSOP-20 thermal performance (RθJB = 0.3°C/W), ±1% internal reference accuracy, monotonic pre-biased startup, diode emulation mode for light-load efficiency, and open-drain PGOOD with 12 µs deglitch timing.
Technical Context
The LM21215AMHE-1/NOPB implements voltage-mode PWM control with a wide-bandwidth error amplifier (GBW = 11 MHz, open-loop gain = 95 dB) and trailing-edge modulation, enabling stable operation with any output capacitor type. Its precision enable pin (1.35 V threshold, 110 mV hysteresis) and AVIN UVLO (2.7 V typical, 200 mV hysteresis) support tight sequencing in multi-rail systems.
It integrates cycle-by-cycle overcurrent protection with rising-edge HS limit (ICLR = 20 A typ) and falling-edge LS limit (ICLF = 14 A), plus OVP/UVP on FB (±12.5% thresholds), thermal shutdown at 165°C with 10°C hysteresis, and zero-cross detection for accurate current sensing during dead-time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.95 V to 5.5 V - supports direct regulation from common 3.3 V and 5 V system rails without pre-regulation. |
| Output Current | 15 A continuous - enables single-chip core supply for mid-range FPGAs and DSPs without parallel devices. |
| Feedback Reference | 0.6 V ±1% - allows precise low-voltage outputs (e.g., 1.2 V @ ±12 mV) critical for modern logic cores. |
| Switching Frequency | 300 kHz to 1.5 MHz (sync-capable) - permits optimization of inductor size vs. efficiency and avoids beat frequencies in multi-converter systems. |
| HS/LS RDS(on) | 7 mΩ / 4.3 mΩ (25°C) - minimizes conduction loss at full load; thermally tracked RDS(on) ensures consistent current limiting across temperature. |
| Soft-Start Time | Internally fixed 500 µs or externally adjustable via SS/TRK pin - limits inrush current into large output capacitors (e.g., >1000 µF) during cold start. |
| Thermal Resistance | RθJB = 0.3°C/W - achieved via exposed pad soldered to PCB ground plane, enabling high-power density without forced air. |
Pinout & Package
LM21215AMHE-1/NOPB is housed in a thermally enhanced 20-pin HTSSOP package (6.50 mm × 4.40 mm) with an exposed thermal pad electrically and thermally connected to PGND. The pad must be soldered to a dedicated PCB ground plane for optimal thermal performance (RθJB = 0.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SYNC) | Frequency sync input | Accepts external clock (300 kHz–1.5 MHz); forces SW edge alignment to SYNC falling edge for EMI control. |
| 2 (SS/TRK) | Soft-start & tracking control | 2-µA current source charges external cap for ramp control; also accepts external voltage for output tracking during sequencing. |
| 3 (EN) | Precision enable input | 1.35 V turn-on threshold with 110 mV hysteresis; internal pullup allows open-circuit default enable. |
| 4 (AVIN) | Analog bias supply | Powers internal reference and error amp; must be filtered from PVIN to reduce noise coupling into feedback loop. |
| 5–7 (PVIN) | Power switch input | Three parallel pins minimize IR drop and inductance to high-side/low-side MOSFETs; connect directly to bulk input cap. |
| 8–10 (PGND) | Power ground return | Low-inductance return path for switch currents; tie locally to PVIN and SW pins before connecting to system ground. |
| 11–16 (SW) | Switch node | Six parallel pins reduce switching node impedance; connect directly to inductor; critical for EMI and efficiency. |
| 17 (PGOOD) | Open-drain status output | Asserts low when VFB exceeds VOVP (112.5%) or falls below VUVP (90%); requires external pullup to monitored rail. |
| 18 (COMP) | Error amplifier output | Connects to compensation network (RC/CC); sets loop stability; sink/source capability supports Type II/III compensation. |
| 19 (FB) | Voltage feedback input | High-impedance (1 nA bias) node tied to resistor divider; senses output voltage for regulation at 0.6 V reference. |
| 20 (AGND) | Analog ground reference | Quiet ground for reference and error amp; separate from PGND to avoid noise injection into regulation loop. |
| EP (Exposed Pad) | Thermal & electrical ground | Must be soldered to PCB thermal pad connected to solid ground plane; primary path for heat dissipation (RθJB = 0.3°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 7-mΩ PMOS + 4.3-mΩ NMOS switches | Eliminates external MOSFETs and gate drivers; enables compact 15-A POL design with <10 mm² footprint. |
| Diode emulation mode (DEM) | Disables low-side switch at light load to prevent reverse inductor current, improving efficiency below ~1 A without requiring external control. |
| Monotonic pre-biased startup | Prevents output voltage undershoot or overshoot when enabled into a pre-charged rail-critical for hot-swap and multi-phase sequencing. |
| Ultra-fast transient response | Wide-bandwidth error amplifier (11 MHz GBW) and voltage-mode control deliver <10 µs recovery from 50% load steps at 1.2 V output. |
| Tracking capability via SS/TRK pin | Enables coordinated ramp-up/down with other regulators using external voltage source-supports DDR memory VDDQ/VTT sequencing. |
Applications
| Telecom Baseband Processing | DSP Core Supply |
|---|---|
Use Scenario: Powering multi-core baseband processors in 4G/LTE remote radio units where thermal density and board space are constrained. IC Role / Device Role / Timing Role: Primary 1.0 V/12 A core regulator with synchronized switching to avoid interference with RF front-end clocks. Use Value: 96% peak efficiency at 12 A (VIN = 5 V) and RθJB = 0.3°C/W enable passive cooling in sealed enclosures. | Use Scenario: Delivering tightly regulated 1.2 V to TI C6000 DSPs in industrial vision systems requiring low-noise, fast transient response. IC Role / Device Role / Timing Role: Synchronous buck controller with monotonic pre-biased startup ensuring clean power-up when DSP resets while system remains powered. Use Value: ±1% reference accuracy and 11 MHz error amplifier GBW maintain <±15 mV output deviation during 6-A/µs load transients. |
| FPGA I/O Bank Supply | Server Memory Subsystem |
Use Scenario: Generating 1.8 V for Spartan-7 FPGA I/O banks in edge AI inference accelerators with strict sequencing requirements. IC Role / Device Role / Timing Role: Tracking regulator using SS/TRK pin to follow main core rail (VCCINT) during power-up/down sequences. Use Value: External voltage tracking eliminates need for dedicated sequencer IC, reducing BOM count and layout complexity. | Use Scenario: Providing 1.35 V DDR4 VDDQ in compact server mezzanine cards where multiple converters operate in close proximity. IC Role / Device Role / Timing Role: Frequency-synchronized buck converter locked to system clock to suppress beat-frequency noise in sensitive analog memory interfaces. Use Value: SYNC pin operation from 300 kHz–1.5 MHz avoids audible noise and reduces EMI filter size by 40% vs. free-running designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS543C20RTWR | Current-mode control; 3.0–16 V input; 15 A max; no integrated high-side MOSFET (external driver required) | Requires external high-side FET and gate driver; higher component count but supports wider input range | Select when input exceeds 5.5 V or when current-mode control is preferred for multi-phase interleaving. |
| ISL91211BIIZ-T | Voltage-mode control; 2.5–5.5 V input; dual-output (2×6 A); smaller 3.5 mm × 3.5 mm QFN package | Provides two independent outputs in same footprint; lower per-output current rating but saves board area | Select for space-constrained dual-rail applications like LPDDR5 VDD/VDDQ where shared thermal budget exists. |
Compared with TPS543C20RTWR and ISL91211BIIZ-T, the LM21215AMHE-1/NOPB offers superior thermal performance (RθJB = 0.3°C/W vs. ≥2.0°C/W), integrated power stage simplicity, and tighter reference accuracy (±1% vs. ±1.5%), making it optimal for single-rail, high-current, thermally demanding POL designs.
Availability
LM21215AMHE-1/NOPB is available at Aetrix Electronics and suitable for telecommunications infrastructure, FPGA core supplies, and embedded computing applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM21215AMHE-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 and embedded processing technologies, with decades of expertise in power management ICs and high-reliability industrial solutions.
The LM21215A product line delivers high-current, thermally optimized synchronous buck converters for point-of-load applications in FPGA, DSP, and telecom infrastructure-designed to replace discrete MOSFET+controller solutions with minimal external components.
FAQ
What is the maximum output current capability of the LM21215AMHE-1/NOPB?
The LM21215AMHE-1/NOPB delivers up to 15 A of continuous output current under recommended operating conditions (TJ ≤ 125°C, proper PCB thermal design). This rating assumes adequate heatsinking via the exposed pad soldered to a multilayer ground plane, and operation within the 2.95 V–5.5 V input range. Peak current limit is 20 A (typical) with cycle-by-cycle protection.
Does the LM21215AMHE-1/NOPB support output voltage tracking during power sequencing?
Yes, the LM21215AMHE-1/NOPB supports voltage tracking via the SS/TRK pin. When an external voltage ramp is applied to this pin, the output voltage follows that ramp with ±20 mV accuracy (–40°C to 125°C). This enables precise coordination with other rails-such as DDR memory VDDQ tracking VDD-in systems requiring controlled power-up/down sequences.
What is the purpose of the AVIN and AGND pins on the LM21215AMHE-1/NOPB?
The AVIN pin supplies clean bias voltage to the internal analog circuitry (reference, error amplifier, comparators), and must be filtered from PVIN using an RC network to reject input ripple. AGND is the quiet analog ground reference-separate from noisy PGND-to prevent switching noise from corrupting feedback accuracy. Both pins are essential for achieving ±1% output regulation and low-noise operation.
Can the LM21215AMHE-1/NOPB operate without an external soft-start capacitor?
Yes, the LM21215AMHE-1/NOPB defaults to an internal 500 µs soft-start time when the SS/TRK pin is left open. An external capacitor is optional and used only when a longer, user-defined ramp time is needed-for example, to limit inrush into large output capacitance (>2200 µF). The device cannot start faster than 500 µs, even with zero external capacitance.
How does the PGOOD signal behave during fault conditions on the LM21215AMHE-1/NOPB?
The LM21215AMHE-1/NOPB's open-drain PGOOD pin pulls low during overvoltage (VFB > 112.5% × 0.6 V), undervoltage (VFB < 90% × 0.6 V), EN deactivation, or pre-biased startup (VFB > VSS/TRK). It includes 12 µs deglitch on rising edges and 15 µs on falling edges to reject noise. A pullup resistor to a valid supply (e.g., VIN) is mandatory for proper logic-level interpretation.
LM21215AMHE-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:
- 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
LM21215AMHE-1/NOPB FAQ
1.How can I place an order for LM21215AMHE-1/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM21215AMHE-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 LM21215AMHE-1/NOPB reliable?
The price and inventory of LM21215AMHE-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 LM21215AMHE-1/NOPB is usually 5 days.
3.What payment methods are accepted for LM21215AMHE-1/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM21215AMHE-1/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM21215AMHE-1/NOPB?
LM21215AMHE-1/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM21215AMHE-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 LM21215AMHE-1/NOPB?
For technical support, including LM21215AMHE-1/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM21215AMHE-1/NOPB requirements.
6.How does Aetrix verify that LM21215AMHE-1/NOPB is sourced from the original manufacturer or authorized distributors?
All LM21215AMHE-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 LM21215AMHE-1/NOPB meets industry standards.
7.What is the process for return or replacement of LM21215AMHE-1/NOPB?
All LM21215AMHE-1/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM21215AMHE-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 LM21215AMHE-1/NOPB part is unused and in its original packaging.
Return procedure for LM21215AMHE-1/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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