My Inquiry
My Account
Texas Instruments LM20125MHE/NOPB
- Part No.:
- LM20125MHE/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM20125MHE/NOPB.pdf
- Description:
- IC REG BUCK ADJ 5A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:185
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM20125MHE/NOPB from Texas Instruments is a 5A, 500 kHz synchronous buck regulator in HTSSOP-16 with exposed pad, featuring peak current mode control, adjustable 0.8V–5.5V output, integrated 32 mΩ/36 mΩ FETs, and pre-biased start-up-designed for FPGA, DSP, and ASIC core voltage regulation from 3.3V/5V rails.
For engineers reviewing the LM20125MHE/NOPB datasheet, LM20125MHE/NOPB pinout, LM20125MHE/NOPB application, or LM20125MHE/NOPB equivalent, key selection considerations include soft-start tracking capability, ±10 mV SS/TRK accuracy, 7.4 A current limit tolerance, 97% efficiency at 500 kHz, and thermal shutdown at 160°C with 10°C hysteresis.
Technical Context
The LM20125MHE/NOPB implements nonlinear parabolic slope compensation to maintain stability across output voltages from 0.8V to 5.5V, eliminating sub-harmonic oscillation without external tuning. Its peak current mode architecture supports stable operation with ceramic, SP, or OSCON output capacitors using only two external compensation components (RC1, CC1).
Internal 2.7V VCC regulator powers bias circuitry; AVIN requires RC filtering from VIN to suppress noise on analog reference paths. The SS/TRK pin provides dual-mode functionality: internal 1 ms soft-start when open, or precise voltage tracking via external resistor network-enabling coordinated power sequencing in multi-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 5 A continuous - supports high-current digital loads including FPGA I/O banks and processor cores without external current sharing. |
| Switching Frequency | 440–560 kHz - fixed-frequency operation enables predictable EMI filtering and compact 1.5 µH inductor selection. |
| Feedback Voltage | 0.788–0.810 V - tight 2.5% tolerance enables accurate output regulation down to 0.8 V for low-voltage logic rails. |
| Current Limit Threshold | 6.7–8.1 A - factory-trimmed over temperature ensures reliable short-circuit protection while enabling smaller-saturation-current inductors. |
| High-Side RDS(on) | 36–55 mΩ - low conduction loss improves full-load efficiency and reduces thermal stress in HTSSOP-16 package. |
| Soft-Start Source Current | 2–7 µA - precise 5 µA typical current enables predictable ramp rate with external capacitor for monotonic startup. |
| PGOOD Accuracy | ±2% hysteresis - ensures clean power-good assertion/deassertion during line/load transients without false triggering. |
Pinout & Package
LM20125MHE/NOPB uses a 16-pin HTSSOP package with exposed thermal pad (Package Number PWP0016A), requiring solder connection to PCB ground plane for optimal thermal performance (θJA = 38°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SS/TRK | Soft-start/Tracking control | 5 µA internal current source sets ramp rate; <800 mV input overrides FB reference for rail tracking-critical for multi-supply sequencing. |
| 2 FB | Feedback input | Connects to resistor divider; 800 mV internal reference sets regulated output-accuracy directly determines VOUT tolerance. |
| 3 PGOOD | Open-drain power-good indicator | Asserts low when VOUT is within ±6% of target; requires 10–100 kΩ pull-up for system monitoring and enable coordination. |
| 4 COMP | Compensation node | External RC network (RC1, CC1) stabilizes control loop-supports wide capacitor types without redesign. |
| 5,16 NC | No-connect | Must be tied to AGND for proper internal biasing-floating pins cause functional instability. |
| 6,7 PVIN | Main power input | High-current path for switch supply; parallel routing and local 22 µF X5R ceramic minimize input ripple and ESR losses. |
| 8,9 SW | Power switch node | Drives external inductor; high dv/dt requires minimized trace area and optional RC snubber for ringing suppression. |
| 10,11 PGND | Power ground return | Separate from AGND; must connect to low-impedance ground plane under exposed pad to handle 5 A switching currents. |
| 12 EN | Precision enable input | 1.08–1.28 V turn-on threshold with 66 mV hysteresis-enables accurate input-voltage sequencing via resistor divider from PVIN. |
| 13 VCC | Internal 2.7 V regulator output | Bypass with 1 µF ceramic capacitor; supplies internal logic-decoupling prevents UVLO false triggering. |
| 14 AVIN | Analog supply input | Must be filtered from PVIN via RC network (RF, CF); isolates noise-sensitive reference and error amplifier circuits. |
| 15 AGND | Analog ground reference | Quiet ground for FB, COMP, EN-must be star-connected to PGND at single point near IC to avoid coupling noise into control loop. |
| EP | Exposed thermal pad | Electrically weakly tied to GND; soldering to PCB ground plane reduces junction-to-ambient thermal resistance by >30%. |
Key Features
| Feature | Design Value |
|---|---|
| Nonlinear slope compensation | Parabolic ramp adapts to output voltage-ensures stable current-mode control across 0.8V–5.5V range without manual compensation adjustment. |
| Pre-biased start-up | SW remains high-impedance until soft-start ramp exceeds FB voltage-prevents reverse current flow into pre-charged outputs (e.g., FPGA VCCIO). |
| Diode emulation mode | Disables low-side FET at zero inductor current-eliminates reverse conduction losses and improves light-load efficiency below 100 mA. |
| Integrated OVP + UVP | 105–111% VFB overvoltage trip with 2–3% hysteresis; 92–96% VFB undervoltage detection-provides autonomous fault response without external supervision. |
| Adjustable soft-start | Capacitor-programmable ramp time (1 ms default)-controls inrush current and enables monotonic startup in cascaded regulator systems. |
Applications
| FPGA Core Power Supply | DSP/ASIC Point-of-Load Regulation |
|---|---|
Use Scenario: Regulating 1.2 V core voltage for Xilinx Artix-7 FPGA with 4 A dynamic load steps. IC Role / Device Role / Timing Role: Primary synchronous buck controller delivering tightly regulated, low-noise DC output with fast transient response. Use Value: 97% efficiency at 500 kHz reduces thermal load on dense BGA packages; pre-bias start-up avoids damage during hot-plug configuration. |
Use Scenario: Generating 1.8 V I/O supply for TI C66x DSP with strict 2% output tolerance. IC Role / Device Role / Timing Role: Precision feedback-controlled buck regulator with 0.8 V reference and ±10 mV SS/TRK tracking accuracy. Use Value: 0.788–0.810 V FB tolerance ensures ≤18 mV output deviation; PGOOD timing (16 µs deglitch) enables reliable boot sequencing. |
| Optical Transceiver Bias Supply | Industrial PLC Digital I/O Power |
Use Scenario: Providing 3.3 V bias for SFP+ laser driver with EMI-sensitive analog front-end. IC Role / Device Role / Timing Role: Low-noise, fixed-frequency buck converter with separate AVIN/AGND paths and RC-filtered analog supply. Use Value: AVIN RC filtering (RF, CF) suppresses switching noise on reference circuitry; 440–560 kHz frequency avoids critical RF bands. |
Use Scenario: Powering isolated digital I/O modules in DIN-rail PLCs operating from 24 V DC bus with 5 V intermediate rail. IC Role / Device Role / Timing Role: Robust industrial-grade buck regulator with thermal shutdown (160°C), UVLO (2.45 V), and automotive-qualified variant (LM20125Q). Use Value: −40°C to +125°C junction rating and 2.6 W power dissipation support extended temperature operation; exposed pad enhances reliability in convection-cooled enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54560RGTT | Wider 3.5–60 V input range; 5.5 A current limit; requires external compensation; no SS/TRK tracking pin. | Better suited for industrial 24 V input systems; lacks rail-tracking capability for multi-supply sequencing. | Select when input voltage exceeds 5.5 V or when higher input voltage range is required-LM20125MHE/NOPB preferred for 3.3 V/5 V bus-derived supplies with tracking needs. |
| MP2315DJ-LF-Z | 4 A rated output; 2.5–36 V input; integrated compensation; no PGOOD or SS/TRK; 30 mΩ/50 mΩ FETs. | Limited to simpler point-of-load use cases; missing precision enable, power-good, and voltage tracking functions. | Choose for cost-sensitive, non-sequenced applications where 5 A output and rail coordination are not required-LM20125MHE/NOPB retains design flexibility for complex power architectures. |
Compared with TPS54560RGTT and MP2315DJ-LF-Z, the LM20125MHE/NOPB uniquely combines 5 A output, 0.8 V–5.5V adjustability, SS/TRK tracking, and PGOOD in a thermally optimized HTSSOP package-making it the optimal choice for FPGA/DSP core supplies requiring coordinated multi-rail startup and high efficiency at 500 kHz.
Availability
LM20125MHE/NOPB is available at Aetrix Electronics and suitable for FPGA core power, DSP point-of-load regulation, optical transceiver biasing, and industrial PLC digital I/O requiring stable component supply across automotive, telecom, and embedded computing markets.
Supply support for LM20125MHE/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 technologies, with decades of expertise in high-reliability DC-DC conversion solutions.
The LM20125MHE/NOPB belongs to TI's PowerWise® synchronous buck regulator family, engineered for high-efficiency, low-noise point-of-load conversion in space-constrained digital systems-from portable devices to infrastructure equipment.
FAQ
What is the minimum output voltage supported by the LM20125MHE/NOPB?
The LM20125MHE/NOPB supports an adjustable output voltage down to 0.8 V, set by the feedback resistor divider connected to the FB pin. Its internal 0.8 V reference (with ±2.5% tolerance) enables precise regulation for modern low-voltage logic rails such as 1.2 V FPGA cores and 1.8 V DSP I/O, and the device maintains stability across this full range using nonlinear slope compensation.
Does the LM20125MHE/NOPB support pre-biased start-up, and how does it behave?
Yes, the LM20125MHE/NOPB supports pre-biased start-up: when the output is already biased above 0 V at power-on, the device will not sink current through the low-side FET until the soft-start ramp on the SS/TRK pin exceeds the voltage at the FB pin. This prevents reverse current flow through parasitic load paths-critical for safe powering of FPGAs and ASICs in hot-plug or multi-rail systems.
What is the purpose of the AVIN and AGND pins on the LM20125MHE/NOPB?
The AVIN pin supplies the analog bias circuitry and must be connected to PVIN through an RC filter (RF, CF) to reject switching noise; AGND is the quiet ground reference for the error amplifier, FB, and COMP pins. Separating AVIN/AGND from PVIN/PGND minimizes noise coupling into the feedback loop-ensuring stable regulation and accurate PGOOD assertion even under high dv/dt conditions at the SW node.
How does the LM20125MHE/NOPB achieve high efficiency at light loads?
The LM20125MHE/NOPB achieves high light-load efficiency via diode emulation mode: when inductor current reaches zero, the low-side FET turns off, preventing reverse conduction and associated losses. At very light loads (<100 mA), it further skips pulses to reduce switching losses-enabling >85% efficiency at 10 mA output while maintaining regulation accuracy and fast transient recovery.
Can the LM20125MHE/NOPB be used in automotive applications?
Yes-the automotive-qualified LM20125Q variant is AEC-Q100 Grade 1 qualified (−40°C to +125°C) and manufactured on an automotive-grade process flow. While the LM20125MHE/NOPB is the commercial version, its identical electrical specifications, thermal shutdown (160°C), and robust protection features (OVP, UVP, current limit) make it suitable for non-certified automotive subsystems such as infotainment displays and body control modules where full qualification is not mandated.
LM20125MHE/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- PowerWise®
- Package/Case:
- 16-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):
- 0.8V
- Voltage - Output (Max):
- 4.68V
- Current - Output:
- 5A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM20125MHE/NOPB FAQ
1.How can I place an order for LM20125MHE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM20125MHE/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 LM20125MHE/NOPB reliable?
The price and inventory of LM20125MHE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM20125MHE/NOPB is usually 5 days.
3.What payment methods are accepted for LM20125MHE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM20125MHE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM20125MHE/NOPB?
LM20125MHE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM20125MHE/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 LM20125MHE/NOPB?
For technical support, including LM20125MHE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM20125MHE/NOPB requirements.
6.How does Aetrix verify that LM20125MHE/NOPB is sourced from the original manufacturer or authorized distributors?
All LM20125MHE/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 LM20125MHE/NOPB meets industry standards.
7.What is the process for return or replacement of LM20125MHE/NOPB?
All LM20125MHE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM20125MHE/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 LM20125MHE/NOPB part is unused and in its original packaging.
Return procedure for LM20125MHE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM20125MHE/NOPB Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
