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Texas Instruments LM20134QMHX/NOPB
- Part No.:
- LM20134QMHX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM20134QMHX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 4A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,840
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Product details
Overview
LM20134QMHX/NOPB from Texas Instruments is an AEC-Q100 qualified 4A synchronous buck regulator in HTSSOP-16EP package, operating from 2.95V–5.5V input, delivering adjustable output down to 0.8V with peak efficiency of 97%, used for powering FPGAs, DSPs, and ASICs in automotive and industrial power rails.
For engineers reviewing the LM20134QMHX/NOPB datasheet, LM20134QMHX/NOPB pinout, LM20134QMHX/NOPB application, or LM20134QMHX/NOPB equivalent, key selection criteria include its 410 kHz internal oscillator (synchronizable to 500 kHz–1.5 MHz), precision enable with 1.18 V threshold and 66 mV hysteresis, pre-bias startup capability, and integrated OVP/UVLO/thermal shutdown protection.
Technical Context
The LM20134QMHX/NOPB implements peak current mode control with nonlinear parabolic slope compensation-dynamically adjusted per output voltage-to ensure stability across full duty-cycle and output-voltage ranges without external tuning. Its dual-function SS/TRK pin supports either programmable soft-start via external capacitor or voltage tracking of higher rail sources.
It integrates 32 mΩ low-side and 36 mΩ high-side MOSFETs, features diode emulation at light loads to suppress negative inductor current, and includes a dedicated SYNC pin that locks high-side switch turn-on to rising edges of external clock signals-enabling phase-shifted multi-converter operation and EMI reduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 4 A continuous-supports high-current digital loads like FPGAs without external current boosting. |
| Input Voltage Range | 2.95 V to 5.5 V-compatible with standard 3.3 V and 5 V system buses. |
| Feedback Reference | 0.8 V ±12 mV-enables precise regulation down to sub-1 V outputs with minimal resistor divider error. |
| Switching Frequency | 410 kHz internal; synchronizable from 500 kHz to 1.5 MHz-allows EMI band avoidance and inductor size optimization. |
| Current Limit Threshold | 6.4 A typical-minimizes required inductor saturation current rating while maintaining robust short-circuit protection. |
| Quiescent Current | 6 mA typical in active mode-reduces standby power loss in always-on subsystems. |
| Thermal Shutdown | 160 °C with 10 °C hysteresis-prevents permanent damage during sustained overload or poor heatsinking. |
Pinout & Package
LM20134QMHX/NOPB uses a 16-pin HTSSOP package with exposed thermal pad (Package Number PWP0016A), requiring PCB ground plane connection for thermal performance. Pin count and layout match industry-standard 16-pin HTSSOP footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SS/TRK | Soft-start/Tracking control | 5 µA internal current source charges external capacitor for monotonic startup; also accepts external voltage for rail tracking. |
| 2 FB | Feedback input | Connects to resistor divider; regulates output by comparing against internal 0.8 V reference. |
| 3 PGOOD | Open-drain power-good indicator | Sinks current when VOUT deviates >6% from target-requires 10–100 kΩ pull-up for system sequencing. |
| 4 COMP | Compensation node | External RC network sets loop crossover frequency and phase margin-only two components needed for stable design. |
| 5 NC | No-connect | Must be tied to AGND for proper biasing and noise immunity. |
| 6,7 PVIN | Main power input | High-current path to internal FETs; requires local low-ESR bulk capacitance near pins. |
| 8,9 SW | Switch node | Drives external inductor; exhibits fast-edge ringing during diode emulation-may need RC snubber. |
| 10,11 PGND | Power ground return | Separate from AGND to isolate high di/dt switching currents from sensitive analog circuitry. |
| 12 EN | Precision enable input | Turns device on at 1.18 V (±0.1 V); 66 mV hysteresis prevents chatter during slow-rising VIN. |
| 13 VCC | Internal 2.7 V regulator output | Bypass with 1 µF ceramic capacitor to stabilize gate drive and internal logic supply. |
| 14 AVIN | Analog supply input | Connected to VIN through RC filter to reduce noise coupling into error amplifier and reference. |
| 15 AGND | Analog ground | Quiet reference return for FB, COMP, and internal bias-must be star-connected to minimize offset. |
| 16 SYNC | Frequency synchronization input | Accepts external clock (500 kHz–1.5 MHz); if open, defaults to ~410 kHz internal oscillator. |
| EP | Exposed thermal pad | Electrically connected to PGND; soldering to PCB ground plane reduces θJA from 38 °C/W to <25 °C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Pre-biased load startup | Starts without sinking current-even if VOUT > 0 V-protecting FPGA/ASIC I/O from reverse conduction damage. |
| Nonlinear slope compensation | Parabolic ramp adapts to output voltage level, eliminating need for manual compensation adjustment across 0.8–5 V output range. |
| Integrated OVP + UVLO + thermal shutdown | Single-chip protection stack eliminates discrete fault-detection circuitry and reduces BOM count. |
| Diode emulation mode | Disables low-side FET when inductor current reaches zero-reducing light-load losses and enabling >90% efficiency at 100 mA. |
| Adjustable soft-start with tracking | One pin (SS/TRK) serves both functions: capacitor-based ramp for controlled rise time or resistor-based ratio for coordinated multi-rail sequencing. |
Applications
| Automotive ADAS Power Rail | FPGA Core Voltage Regulation |
|---|---|
|
Use Scenario: Supplies 1.2 V core voltage to radar processor SoC in vehicle front camera module, operating from 5 V battery-derived bus under cold-crank conditions. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing regulated, sequenced, and monitored 1.2 V output with pre-bias tolerance and thermal foldback. Use Value: AEC-Q100 qualification ensures reliability over −40°C to +125°C junction; 410 kHz base frequency avoids AM radio band; PGOOD enables safe boot sequencing. |
Use Scenario: Powers Xilinx Artix-7 FPGA core in industrial PLC controller, requiring monotonic 1.0 V startup with tight ±2% regulation and fast transient response. IC Role / Device Role / Timing Role: High-current DC-DC converter with adjustable soft-start and tracking for synchronized multi-supply ramp-up. Use Value: SS/TRK pin enables voltage tracking of auxiliary 3.3 V rail; 6.4 A current limit supports FPGA dynamic current spikes; COMP pin allows loop tuning for <10 µs load-step recovery. |
| Optical Line Card Bias Supply | Industrial DSP Signal Chain |
|
Use Scenario: Generates stable 2.5 V bias for transimpedance amplifiers and laser drivers in 10Gbps SFP+ modules, where EMI must stay below CISPR-22 Class B limits. IC Role / Device Role / Timing Role: Synchronized buck regulator locked to system clock to eliminate beat frequencies and narrowband EMI peaks. Use Value: SYNC pin accepts 625 MHz reference (divided to 1.25 MHz) for deterministic switching edge placement; HTSSOP-EP package enables compact layout with low-inductance GND paths. |
Use Scenario: Delivers 1.8 V to TI C6748 DSP in medical ultrasound beamformer, requiring ultra-low noise, no reverse current, and graceful shutdown during brownout. IC Role / Device Role / Timing Role: Low-noise, high-PoL regulator with precision enable and UVLO hysteresis for clean power sequencing and fault isolation. Use Value: AVIN/AGND separation minimizes PSRR degradation; EN pin's 1.18 V threshold aligns with system supervisor IC thresholds; thermal shutdown prevents latch-up during probe overheating events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54332DR | 3 A rated, 2.95–6.0 V input, fixed 500 kHz frequency, no SYNC or tracking pin | Lacks frequency synchronization and voltage tracking-unsuitable for multi-converter EMI control or rail sequencing | Select when cost sensitivity outweighs need for advanced control features and AEC-Q100 compliance is not required. |
| LM2678SX-5.0/NOPB | 5 A rated, 8–40 V input, external MOSFETs, no integrated compensation or PGOOD | Requires external FETs, compensation network, and power-good comparator-higher design complexity and board area | Choose only for high-input-voltage (>6 V) industrial applications where LM20134QMHX/NOPB's 5.5 V max input is insufficient. |
Compared with TPS54332DR and LM2678SX-5.0/NOPB, LM20134QMHX/NOPB uniquely combines AEC-Q100 qualification, 4 A output, SYNC capability, and single-pin soft-start/tracking-making it optimal for space-constrained, thermally demanding, and EMI-sensitive automotive and industrial point-of-load designs.
Availability
LM20134QMHX/NOPB is available at Aetrix Electronics and suitable for automotive ADAS systems, FPGA power delivery, optical communications infrastructure, and industrial DSP power rails requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LM20134QMHX/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 automotive-grade product development and manufacturing expertise.
The LM20134QMHX/NOPB belongs to TI's PowerWise® synchronous buck regulator family, engineered specifically for high-efficiency, low-voltage point-of-load conversion in safety-critical automotive and ruggedized industrial environments.
FAQ
What is the maximum input voltage rating for LM20134QMHX/NOPB?
The absolute maximum input voltage at PVIN and AVIN pins is +6 V, but the recommended operating range is 2.95 V to 5.5 V per the datasheet. Exceeding 5.5 V may trigger internal overvoltage protection or cause premature failure. The LM20134QMHX/NOPB is designed for 3.3 V and 5 V bus systems-not for wide-input industrial or automotive battery-direct applications.
Does LM20134QMHX/NOPB support start-up into a pre-biased output?
Yes, LM20134QMHX/NOPB supports pre-biased start-up: it will not sink current from the output during soft-start, preventing reverse conduction through load parasitics. This behavior is confirmed in the Operation Description section and validated in Figure 23 (Start-Up Tracking) of the SNVS527G datasheet. The LM20134QMHX/NOPB remains in high-impedance state until the SS/TRK ramp exceeds the FB voltage.
How does the LM20134QMHX/NOPB handle light-load efficiency?
The LM20134QMHX/NOPB improves light-load efficiency via diode emulation mode-disabling the low-side FET when inductor current reaches zero-and pulse-skipping below ~100 mA. These modes reduce switching and conduction losses, enabling >90% efficiency at 100 mA output. The LM20134QMHX/NOPB does not use forced PWM or burst-mode; its behavior is fully automatic and transparent to the user.
Can LM20134QMHX/NOPB be synchronized to an external clock below 500 kHz?
No-LM20134QMHX/NOPB's SYNC pin accepts only 500 kHz to 1.5 MHz external clocks. Attempting synchronization below 460 kHz (minimum specified) results in unstable or uncontrolled operation. If lower frequency is required, the LM20134QMHX/NOPB must operate in free-running mode (~410 kHz), as stated in the Electrical Characteristics table (FOSCL = 460 kHz).
What is the thermal resistance (θJA) of LM20134QMHX/NOPB in standard layout?
The published junction-to-ambient thermal resistance (θJA) for LM20134QMHX/NOPB in a standard 2-layer PCB layout with 1-in² copper pour under the exposed pad is 38 °C/W. This value assumes no additional heatsinking; actual θJA drops significantly with enhanced thermal vias and multilayer ground planes. The LM20134QMHX/NOPB's exposed pad must be soldered to PCB ground for this rating to apply.
LM20134QMHX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- PowerWise®
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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):
- 5V
- Current - Output:
- 4A
- Frequency - Switching:
- 500kHz ~ 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM20134QMHX/NOPB FAQ
1.How can I place an order for LM20134QMHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM20134QMHX/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 LM20134QMHX/NOPB reliable?
The price and inventory of LM20134QMHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM20134QMHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM20134QMHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM20134QMHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM20134QMHX/NOPB?
LM20134QMHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM20134QMHX/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 LM20134QMHX/NOPB?
For technical support, including LM20134QMHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM20134QMHX/NOPB requirements.
6.How does Aetrix verify that LM20134QMHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM20134QMHX/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 LM20134QMHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM20134QMHX/NOPB?
All LM20134QMHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM20134QMHX/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 LM20134QMHX/NOPB part is unused and in its original packaging.
Return procedure for LM20134QMHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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