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Texas Instruments LM21215AMHX-1/NOPB
- Part No.:
- LM21215AMHX-1/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM21215AMHX-1/NOPB.pdf
- Description:
- IC REG BUCK ADJ 15A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,058
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Product details
Overview
LM21215AMHX-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, and supporting 300 kHz–1.5 MHz frequency synchronization - used in FPGA core supplies and high-efficiency point-of-load (POL) conversion.
For engineers reviewing the LM21215AMHX-1/NOPB datasheet, LM21215AMHX-1/NOPB pinout, LM21215AMHX-1/NOPB application, or LM21215AMHX-1/NOPB equivalent, key selection considerations include its integrated 7-mΩ PMOS high-side switch, 4.3-mΩ NMOS low-side switch, ±1% internal reference, monotonic pre-biased startup, and HTSSOP-20 thermal pad layout requirements.
Technical Context
The LM21215AMHX-1/NOPB implements voltage-mode PWM control with a wide-bandwidth error amplifier (11 MHz GBW, 95 dB open-loop gain), enabling stable regulation across ceramic, polymer, and electrolytic output capacitors without external compensation complexity. Its trailing-edge modulation and high gain-bandwidth loop deliver ultra-fast line/load transient response.
It integrates cycle-by-cycle overcurrent protection (ICLR = 20 A typ, ICLF = 14 A), OVP/UVP on FB (±2% hysteresis), thermal shutdown at 165°C with 10°C hysteresis, and precision enable (1.35 V threshold, 110 mV hysteresis), all coordinated via analog control logic - not digital state machines or firmware.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.95 V to 5.5 V - supports direct connection to 3.3 V and 5 V system rails without pre-regulation. |
| Output Current | Up to 15 A continuous - enables single-chip power delivery for mid-tier FPGAs and DSPs. |
| Output Voltage Range | 0.6 V to VIN - supports sub-1 V core voltages with ±1% reference accuracy (0.6 V ±6 mV). |
| Switching Frequency | 300 kHz to 1.5 MHz (sync-capable) - allows EMI optimization and inductor size reduction. |
| High-Side RDS(on) | 7 mΩ (typ) at TJ = 25°C - minimizes conduction loss at high load, enabling >94% efficiency at 12 A/1.2 V. |
| Low-Side RDS(on) | 4.3 mΩ (typ) at TJ = 25°C - eliminates need for external Schottky diode, reducing BOM count and thermal stress. |
| Soft-Start Time | Internally fixed 500 µs or externally adjustable via SS/TRK capacitor - prevents inrush current damage to input caps and upstream converters. |
| Thermal Resistance | RθJB = 0.3°C/W - achieved via exposed pad soldered to PCB ground plane, enabling high-power operation in compact layouts. |
Pinout & Package
LM21215AMHX-1/NOPB uses a thermally enhanced 20-pin HTSSOP package (6.50 mm × 4.40 mm) with exposed thermal pad electrically and thermally connected to PGND. The pad must be soldered to a large PCB copper area for optimal junction-to-board thermal performance (RθJB = 0.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SYNC | Frequency sync input | Accepts external 300 kHz–1.5 MHz clock; falling edge triggers HS switch turn-on - critical for multi-rail EMI alignment. |
| 2 SS/TRK | Soft-start & tracking control | Sinks 1.9 µA to set ramp rate; also accepts external voltage for output voltage tracking during sequencing. |
| 3 EN | Precision enable input | 1.35 V threshold with 110 mV hysteresis - enables tight power-up sequencing without external comparators. |
| 4 AVIN | Analog bias supply | Must be RC-filtered from PVIN to isolate control circuitry from power rail noise and ripple. |
| 5–7 PVIN | Power input to switches | Three dedicated pins reduce IR drop and improve thermal distribution for 15 A operation. |
| 8–10 PGND | Power ground return | Separate low-impedance path for switch currents - prevents noise coupling into analog ground. |
| 11–16 SW | Switch node outputs | Six parallel pins minimize trace inductance and voltage spikes at the inductor connection point. |
| 17 PGOOD | Open-drain status indicator | Asserts low on OVP/UVP/EN deassertion; requires external pullup - used for supply sequencing and fault reporting. |
| 18 COMP | Error amplifier output | Connects to external RC network for loop compensation - sets bandwidth and phase margin. |
| 19 FB | Voltage feedback input | Monitors resistive divider output; referenced to 0.6 V internal bandgap - sets final output voltage. |
| 20 AGND | Analog ground reference | Quiet ground for reference and error amp - must be separated from PGND and tied at single point. |
| EP | Exposed thermal pad | Electrically connected to PGND; soldering pad to PCB plane is mandatory for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual MOSFET power stage | 7-mΩ PMOS HS + 4.3-mΩ NMOS LS - eliminates external FETs and gate drivers, reducing layout complexity and footprint. |
| Automatic diode emulation mode (DEM) | Enables discontinuous conduction at light loads - maintains >85% efficiency down to 100 mA without forced PWM. |
| Monotonic pre-biased startup | Prevents output voltage undershoot or reverse current when powering into an already charged rail - essential for hot-swap and multi-rail systems. |
| Voltage-mode control with high GBW error amp | 11 MHz gain-bandwidth - provides stable loop response with any output capacitor type, simplifying capacitor selection. |
| Open-drain PGOOD with deglitching | 12 µs high-pulse / 15 µs low-pulse filtering - rejects transient glitches while ensuring reliable fault detection and sequencing. |
| Thermally enhanced HTSSOP-20 | RθJB = 0.3°C/W - enables 15 A operation at ambient temperatures up to 85°C with minimal heatsinking. |
Applications
| Telecom Baseband Processing | FPGA Core Power Supply |
|---|---|
Use Scenario: Powers baseband ASICs in 4G/LTE remote radio units requiring tight voltage tolerance and fast transient response under burst traffic loads. IC Role / Device Role / Timing Role: Primary POL regulator delivering 1.0 V @ 12 A with <50 µs load-step recovery and ±1% output accuracy. Use Value: Integrated current limiting and thermal shutdown prevent field failures during RF amplifier transmit bursts. |
Use Scenario: Supplies configurable logic core voltage for Xilinx Artix-7 or Intel Cyclone V FPGAs in industrial controllers. IC Role / Device Role / Timing Role: Synchronous buck converter generating 0.95 V ±1% from 3.3 V rail, with tracking-enabled power-up sequencing. Use Value: SS/TRK pin enables voltage ramp coordination with auxiliary I/O banks, preventing configuration errors during startup. |
| Server Memory Subsystem | Embedded Computing Power |
Use Scenario: Delivers DDR4 memory termination voltage (VTT) and reference voltage (VREF) in compact server DIMM modules. IC Role / Device Role / Timing Role: Dual-output implementation using two LM21215AMHX-1/NOPB devices - one for VTT (1.2 V), one for VREF (0.6 V). Use Value: Frequency synchronization eliminates beat frequencies between memory and CPU power rails, reducing signal integrity noise. |
Use Scenario: Powers ARM Cortex-A53 application processors in edge AI gateways with strict thermal and size constraints. IC Role / Device Role / Timing Role: Main SoC core supply operating at 1.1 V / 10 A with 500 kHz switching to balance efficiency and EMI. Use Value: Exposed thermal pad enables direct thermal coupling to metal chassis, eliminating need for discrete heatsinks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | 12 A max output, 4.5–28 V input range, no SYNC pin, smaller QFN-10 package | Better suited for higher-input industrial rails; lacks frequency synchronization and tracking capability | Select when input exceeds 5.5 V or board space is severely constrained; not suitable for multi-rail sync-critical designs. |
| RTQ2132BGQW | 15 A output, 2.7–5.5 V input, 300 kHz–2.2 MHz sync range, integrated MOSFETs, but no SS/TRK pin | Higher max frequency and wider input range, but lacks voltage tracking for sequenced startups | Choose for EMI-sensitive applications needing >1.5 MHz switching; omit if output voltage tracking during power-up is required. |
Compared with MP2315DJ-LF-Z and RTQ2132BGQW, the LM21215AMHX-1/NOPB uniquely combines 15 A capability, 0.6 V minimum output, SS/TRK-based tracking, and 300 kHz–1.5 MHz synchronization - making it the only option among the three qualified for FPGA core sequencing with multi-rail EMI coordination.
Availability
LM21215AMHX-1/NOPB is available at Aetrix Electronics and suitable for telecommunications infrastructure, FPGA core voltage supplies, and high-efficiency POL conversion requiring stable component supply across long production cycles.
Supply support for LM21215AMHX-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 IC design and manufacturing.
The LM21215A product line delivers high-current, low-voltage synchronous buck regulators optimized for FPGA, DSP, and processor core supplies where efficiency, thermal performance, and precise sequencing are critical.
FAQ
What is the maximum output current supported by the LM21215AMHX-1/NOPB?
The LM21215AMHX-1/NOPB supports up to 15 A of continuous output current under recommended operating conditions (TJ ≤ 125°C, proper PCB thermal design). This rating assumes use of the exposed thermal pad soldered to a ≥4 cm² copper area and adequate airflow. Derating applies above 85°C ambient.
Does the LM21215AMHX-1/NOPB require external compensation components?
Yes, the LM21215AMHX-1/NOPB requires external RC components on the COMP pin for loop compensation. Its voltage-mode architecture relies on user-defined compensation to achieve stability across varying output capacitance and load conditions - typical networks use 1–10 nF capacitors and 1–10 kΩ resistors based on application-specific gain/phase targets.
Can the LM21215AMHX-1/NOPB operate with a pre-biased output voltage?
Yes, the LM21215AMHX-1/NOPB features monotonic pre-biased startup. When enabled into a pre-charged output, it avoids reverse current flow and output voltage undershoot by controlling the high-side switch turn-on timing - confirmed in Figure 19 of the official datasheet.
What is the purpose of the SS/TRK pin on the LM21215AMHX-1/NOPB?
The SS/TRK pin on the LM21215AMHX-1/NOPB serves dual functions: (1) soft-start control - an internal 1.9 µA current source charges an external capacitor to set output voltage ramp time; (2) voltage tracking - accepts an external ramp signal to coordinate startup with another regulator's output, ensuring safe sequencing in multi-rail systems.
Is the LM21215AMHX-1/NOPB pin-compatible with the LM21215A-1 or LM21215A-2 variants?
No, the LM21215AMHX-1/NOPB is not pin-compatible with LM21215A-1 or LM21215A-2. While all share the same HTSSOP-20 package and core functionality, the -1 and -2 suffixes denote fixed-output versions (1.0 V and 1.2 V respectively) with different internal feedback networks and pin configurations - the LM21215AMHX-1/NOPB is the adjustable version with FB/COMP pins exposed.
LM21215AMHX-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
LM21215AMHX-1/NOPB FAQ
1.How can I place an order for LM21215AMHX-1/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM21215AMHX-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 LM21215AMHX-1/NOPB reliable?
The price and inventory of LM21215AMHX-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 LM21215AMHX-1/NOPB is usually 5 days.
3.What payment methods are accepted for LM21215AMHX-1/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM21215AMHX-1/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM21215AMHX-1/NOPB?
LM21215AMHX-1/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM21215AMHX-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 LM21215AMHX-1/NOPB?
For technical support, including LM21215AMHX-1/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM21215AMHX-1/NOPB requirements.
6.How does Aetrix verify that LM21215AMHX-1/NOPB is sourced from the original manufacturer or authorized distributors?
All LM21215AMHX-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 LM21215AMHX-1/NOPB meets industry standards.
7.What is the process for return or replacement of LM21215AMHX-1/NOPB?
All LM21215AMHX-1/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM21215AMHX-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 LM21215AMHX-1/NOPB part is unused and in its original packaging.
Return procedure for LM21215AMHX-1/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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