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Texas Instruments LM21215AMH-1/NOPB
- Part No.:
- LM21215AMH-1/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM21215AMH-1/NOPB.pdf
- Description:
- IC REG BUCK ADJ 15A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:471
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Product details
Overview
LM21215AMH-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 frequency synchronization (300 kHz–1.5 MHz), integrated 7-mΩ PMOS high-side and 4.3-mΩ NMOS low-side switches, and ±1% internal reference - deployed in FPGA core supplies and telecom POL applications.
For engineers reviewing the LM21215AMH-1/NOPB datasheet, LM21215AMH-1/NOPB pinout, LM21215AMH-1/NOPB application, or LM21215AMH-1/NOPB equivalent, key selection considerations include its HTSSOP-20 thermal pad package, monotonic pre-biased startup, diode emulation mode for light-load efficiency, PGOOD open-drain indicator, and voltage-mode loop stability across ceramic capacitor types.
Technical Context
The LM21215AMH-1/NOPB implements voltage-mode PWM control with a wide-bandwidth error amplifier (11 MHz GBW, 95 dB open-loop gain) and trailing-edge modulation, enabling stable regulation with any output capacitor type. Its high-gain loop supports ultra-fast line/load transient response and narrow minimum on-time (140 ns).
It integrates cycle-by-cycle overcurrent protection with rising-edge high-side limit (ICLR = 20 A typ) and falling-edge low-side limit (ICLF = 14 A), plus OVP/UVP (±2% hysteresis), thermal shutdown (165°C), and UVLO (2.7 V with 200 mV hysteresis) - all coordinated through a single analog control block with precision enable (1.35 V threshold, 110 mV hysteresis).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.95 V to 5.5 V - supports direct regulation from 3.3 V and 5 V system rails without intermediate stages. |
| Max Output Current | 15 A continuous - enabled by dual integrated MOSFETs (7 mΩ HS / 4.3 mΩ LS) and thermally enhanced HTSSOP-20 package. |
| Output Voltage Range | 0.6 V to VIN - precise ±1% internal reference enables sub-1 V core supplies for modern FPGAs and DSPs. |
| Switching Frequency | 300 kHz to 1.5 MHz (sync-capable); default 500 kHz - allows optimization of inductor size vs. efficiency and EMI. |
| Efficiency Peak | 98% at 12 A, 1.2 V out, 5 V in - achieved via synchronous rectification and low RDS(on) power switches. |
| Soft-Start Time | Internally fixed 500 µs or externally adjustable via SS/TRK pin - limits inrush current into large output capacitors. |
| Thermal Resistance | RθJB = 0.3 °C/W - exposed pad soldered to PCB ground plane enables high-power operation without heatsink. |
Pinout & Package
LM21215AMH-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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SYNC) | Frequency sync input | Accepts external clock (300 kHz–1.5 MHz) to synchronize switching; no clock defaults to 500 kHz. |
| 2 (SS/TRK) | Soft-start & tracking control | 2-µA current source charges external capacitor for controlled ramp-up; also enables output voltage tracking. |
| 3 (EN) | Precision enable input | Active-high with 1.35 V threshold and 110 mV hysteresis; internal pullup allows open-circuit use. |
| 4 (AVIN) | Analog bias supply | Powers internal reference and error amp; must be filtered from PVIN to reduce noise coupling. |
| 5–7 (PVIN) | Power input for switches | Three parallel pins minimize IR drop and inductance; require local low-ESR input capacitance. |
| 8–10 (PGND) | Power ground return | Low-impedance path for switch currents; separate from AGND to avoid noise injection into analog circuitry. |
| 11–16 (SW) | Switch node | Six parallel pins connect to inductor; must be tied locally with minimal trace inductance. |
| 17 (PGOOD) | Open-drain power-good output | Signals valid output (VFB within ±2% of 0.6 V) after deglitch delay; requires external pullup. |
| 18 (COMP) | Error amplifier output | Connects to RC compensation network; drives voltage loop stability and transient response. |
| 19 (FB) | Voltage feedback input | Resistor divider connects here to set output voltage; 1 nA bias current enables high-resistance dividers. |
| 20 (AGND) | Analog ground reference | Quiet ground for reference, error amp, and feedback; must be separated from PGND and joined at single point. |
| EP (Exposed Pad) | Thermal & electrical ground | Must be soldered to PCB ground plane to achieve RθJB = 0.3 °C/W and ensure thermal reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Switches | 7-mΩ PMOS high-side + 4.3-mΩ NMOS low-side eliminate external MOSFETs and Schottky diodes. |
| Diode Emulation Mode | Enables discontinuous conduction at light loads, improving efficiency below ~1 A without burst-mode noise. |
| Monotonic Pre-Biased Startup | Guarantees controlled output ramp even when output capacitor is pre-charged - critical for multi-rail sequencing. |
| Voltage-Mode Control Loop | High-gain error amplifier (11 MHz GBW) ensures stable operation with ceramic, polymer, or electrolytic output caps. |
| Comprehensive Protection | OCP (cycle-by-cycle), OVP/UVP (±2% hysteresis), UVLO (2.7 V), thermal shutdown (165°C), and PGOOD fault reporting. |
Applications
| Telecom Infrastructure Power | FPGA Core Voltage Supply |
|---|---|
Use Scenario: Point-of-load conversion in 48 V backplane systems using intermediate 5 V or 3.3 V rails. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering stable 1.0 V or 1.2 V to FPGA core logic under dynamic load transients. Use Value: 98% peak efficiency and ultra-fast transient response maintain voltage within ±1% during 10 A step changes. |
Use Scenario: Powering Xilinx or Intel FPGA core domains requiring tightly regulated sub-1 V supplies with sequencing control. IC Role / Device Role / Timing Role: Core voltage regulator with monotonic pre-biased startup and SS/TRK tracking for safe multi-rail power-up. Use Value: ±1% reference accuracy and 0.6 V minimum output support advanced 7 nm/5 nm FPGA core requirements. |
| High-Efficiency Server POL | Embedded Computing Power |
Use Scenario: Distributed power delivery in rack-mounted servers where thermal density and efficiency are critical. IC Role / Device Role / Timing Role: High-current (15 A) POL converter stepping down 5 V intermediate bus to processor I/O or memory interface voltages. Use Value: HTSSOP-20 exposed pad achieves RθJB = 0.3 °C/W, enabling full 15 A operation without airflow or heatsink. |
Use Scenario: Power management in industrial edge controllers and AI inference modules with space-constrained PCBs. IC Role / Device Role / Timing Role: Compact, thermally robust buck regulator supporting 1.8 V or 2.5 V I/O rails with integrated protection and PGOOD monitoring. Use Value: Integrated OVP/UVP, thermal shutdown, and open-drain PGOOD simplify system-level fault handling and diagnostics. |
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 | Current-mode control; 30-A capability; QFN-22 package; higher quiescent current (4 mA vs. 1.5 mA) | Better suited for higher-current, multi-phase designs; lacks diode emulation mode | Select when >15 A output or multi-phase coordination is required; verify loop compensation due to control architecture difference. |
| MP2315GJ-Z | Fixed 500 kHz frequency; 12-A rating; smaller TSOT23-8 package; no SYNC or tracking capability | Targeted at cost-sensitive, space-constrained applications with simpler sequencing needs | Choose for compact, lower-current designs where frequency flexibility and rail tracking are not required. |
Compared with TPS543C20RTWR and MP2315GJ-Z, the LM21215AMH-1/NOPB uniquely balances 15-A capability, voltage-mode stability with ceramic capacitors, diode emulation for light-load efficiency, and comprehensive sequencing features (SS/TRK, monotonic startup, PGOOD) in a thermally optimized HTSSOP package.
Availability
LM21215AMH-1/NOPB is available at Aetrix Electronics and suitable for telecommunications infrastructure, FPGA core voltage supplies, and high-efficiency server point-of-load applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM21215AMH-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 LM21215A product line delivers high-current, thermally robust synchronous buck regulators for demanding FPGA, ASIC, and telecom POL applications - designed for ease of use, minimal external components, and robust protection across industrial temperature ranges.
FAQ
What is the maximum output current supported by the LM21215AMH-1/NOPB?
The LM21215AMH-1/NOPB supports up to 15 A of continuous output current under recommended operating conditions (TJ ≤ 125°C, proper PCB thermal design). This is enabled by its integrated 7-mΩ high-side and 4.3-mΩ low-side MOSFETs and the HTSSOP-20 package's low 0.3 °C/W junction-to-board thermal resistance. Derating applies above 85°C ambient or with insufficient copper area.
Does the LM21215AMH-1/NOPB support output voltage tracking?
Yes, the LM21215AMH-1/NOPB supports output voltage tracking via its SS/TRK pin. When an external voltage ramp is applied to this pin, the FB node follows it until regulation is established - enabling precise power sequencing with other rails. Tracking accuracy is ±20 mV over temperature, and the pin also serves as the soft-start timing control.
What protection features are integrated into the LM21215AMH-1/NOPB?
The LM21215AMH-1/NOPB integrates cycle-by-cycle overcurrent protection (ICLR = 20 A typ), overvoltage/undervoltage protection (±2% hysteresis), thermal shutdown (165°C with 10°C hysteresis), input UVLO (2.7 V with 200 mV hysteresis), and open-drain PGOOD fault reporting. These operate independently and concurrently to safeguard both the IC and downstream circuitry.
Can the LM21215AMH-1/NOPB operate without an external soft-start capacitor?
Yes, the LM21215AMH-1/NOPB operates with an internally fixed 500 µs soft-start time when the SS/TRK pin is left open. An external capacitor can extend this time linearly (e.g., 100 nF yields ~53 ms), but the device cannot start faster than 500 µs. The internal 1.9-µA current source ensures monotonic, pre-biased-safe ramp-up regardless of configuration.
What is the purpose of separating AVIN and PVIN in the LM21215AMH-1/NOPB?
AVIN powers the analog control circuitry (reference, error amplifier, comparators), while PVIN supplies the power switches. Separating them - with a low-pass RC filter between PVIN and AVIN - prevents high-frequency switching noise from degrading voltage reference accuracy and loop stability. This separation is essential to maintain ±1% output regulation and fast transient response.
LM21215AMH-1/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
LM21215AMH-1/NOPB FAQ
1.How can I place an order for LM21215AMH-1/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM21215AMH-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 LM21215AMH-1/NOPB reliable?
The price and inventory of LM21215AMH-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 LM21215AMH-1/NOPB is usually 5 days.
3.What payment methods are accepted for LM21215AMH-1/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM21215AMH-1/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM21215AMH-1/NOPB?
LM21215AMH-1/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM21215AMH-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 LM21215AMH-1/NOPB?
For technical support, including LM21215AMH-1/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM21215AMH-1/NOPB requirements.
6.How does Aetrix verify that LM21215AMH-1/NOPB is sourced from the original manufacturer or authorized distributors?
All LM21215AMH-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 LM21215AMH-1/NOPB meets industry standards.
7.What is the process for return or replacement of LM21215AMH-1/NOPB?
All LM21215AMH-1/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM21215AMH-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 LM21215AMH-1/NOPB part is unused and in its original packaging.
Return procedure for LM21215AMH-1/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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