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Texas Instruments LM20134MH/NOPB
- Part No.:
- LM20134MH/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM20134MH/NOPB.pdf
- Description:
- IC REG BUCK ADJ 4A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:368
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Product details
Overview
LM20134MH/NOPB from Texas Instruments is a 4A synchronous buck regulator with peak current mode control, 2.95V–5.5V input range, 0.8V adjustable output, and frequency synchronization capability-designed for powering FPGAs, DSPs, and ASICs from 3.3V/5V rails.
For engineers reviewing the LM20134MH/NOPB datasheet, LM20134MH/NOPB pinout, LM20134MH/NOPB application, or LM20134MH/NOPB equivalent, key selection considerations include soft-start tracking, pre-bias startup behavior, integrated 32 mΩ FETs, PGOOD signaling, and thermal shutdown at 160°C.
Technical Context
The LM20134MH/NOPB implements peak current mode control with nonlinear parabolic slope compensation-dynamically adjusted per output voltage to ensure stability across 0.8V–VIN−0.5V range. It integrates high-side and low-side MOSFETs (36 mΩ/32 mΩ typ) and features cycle-by-cycle current limiting with 6.4A typical current limit threshold.
Its oscillator supports internal operation at 410 kHz (±50 kHz) or external synchronization from 500 kHz to 1.5 MHz via SYNC pin. The SS/TRK pin enables either programmable soft-start (via external capacitor) or voltage tracking of an upstream rail, while supporting monotonic startup into pre-biased outputs without sinking current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 4A continuous-supports high-current digital loads without external current sharing. |
| Input Voltage Range | 2.95V to 5.5V-compatible with standard 3.3V and 5V system buses. |
| Feedback Reference | 0.8V ±12 mV-enables precise regulation down to 0.8V with external resistor divider. |
| Switching Frequency | 410 kHz internal or 500 kHz–1.5 MHz synchronized-allows EMI optimization and inductor size reduction. |
| Current Limit Threshold | 6.4A typical-minimizes required inductor saturation current rating. |
| Efficiency | 97% peak-achieved using integrated low-RDS(on) FETs and diode emulation at light load. |
| Thermal Shutdown | 160°C with 10°C hysteresis-protects against sustained overtemperature without latch-up. |
Pinout & Package
The LM20134MH/NOPB is housed in a 16-pin HTSSOP package with exposed thermal pad (Package Number PWP0016A), requiring PCB ground plane connection for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SS/TRK | Soft-Start/Tracking control | 5 µA internal current source sets ramp rate; drives external cap for monotonic startup or tracks reference voltage. |
| 2 FB | Feedback input | Connects to resistor divider; regulates output by comparing to 0.8V internal reference. |
| 3 PGOOD | Open-drain power-good indicator | Sinks current when VOUT is within ±6% of target-requires 10–100 kΩ pull-up for system sequencing. |
| 4 COMP | Compensation node | External RC network stabilizes control loop-two-component compensation enables wide capacitor compatibility. |
| 5 NC | No-connect | Must be tied to AGND for proper operation-no internal connection. |
| 6,7 PVIN | Main power input | High-current path to internal FETs-requires local low-ESR ceramic input capacitance. |
| 8,9 SW | Switch node | Drives external inductor; transitions between PVIN and PGND-critical for layout EMI control. |
| 10,11 PGND | Power ground | Low-impedance return for high-current switching paths-separate from AGND to minimize noise coupling. |
| 12 EN | Precision enable input | 1.18V turn-on threshold with 66 mV hysteresis-supports accurate input-voltage sequencing via resistor divider. |
| 13 VCC | Internal 2.7V bias supply | Bypassed with 1 µF ceramic cap-powers internal logic and gate drivers independently of PVIN. |
| 14 AVIN | Analog supply input | Filtered via RC network from VIN-provides clean bias for error amplifier and reference circuits. |
| 15 AGND | Analog ground | Quiet reference point for feedback and compensation-must be isolated from noisy PGND planes. |
| 16 SYNC | Frequency sync input | Accepts external clock (500 kHz–1.5 MHz); defaults to ~410 kHz if grounded or floating. |
| EP | Exposed thermal pad | Weakly connected to GND-must be soldered to PCB ground plane for θJA = 38°C/W thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Nonlinear slope compensation | Parabolic ramp adapts to output voltage-ensures stable current-mode control across full 0.8V–4.5V output range without manual tuning. |
| Pre-bias startup support | No output sinking during startup-even with pre-charged VOUT-prevents damage to FPGA/ASIC parasitic paths. |
| Diode emulation mode | Disables reverse inductor current at light load-reduces switching losses and improves efficiency below ~100 mA. |
| Integrated OVP & UVLO | 108% VFB overvoltage trip with 3% hysteresis; 2.7V UVLO with 45 mV hysteresis-enables robust fault handling without external components. |
| Adjustable soft-start | Capacitor-programmable ramp time-delivers controlled inrush current and enables reliable PGOOD-based sequencing. |
Applications
| FPGA Core Power Supply | DSP I/O Rail Regulation |
|---|---|
Use Scenario: Powers Xilinx or Intel FPGA core logic requiring tightly regulated 0.85V–1.2V at up to 4A with strict monotonic startup. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering core voltage; uses SS/TRK pin for voltage tracking during multi-rail sequencing. Use Value: Pre-bias startup prevents current injection into FPGA VCCINT during hot-swap; PGOOD enables safe configuration loading. | Use Scenario: Supplies 1.8V or 2.5V I/O banks for TI C6000 or Analog Devices SHARC DSPs from a shared 3.3V bus. IC Role / Device Role / Timing Role: Secondary buck converter with independent enable control-sequenced after core rail using EN pin resistor divider. Use Value: 97% peak efficiency minimizes thermal load on dense DSP carrier boards; SYNC pin allows interleaving with adjacent rails. |
| Optical Transceiver Bias | Industrial PLC CPU Module |
Use Scenario: Generates stable 3.3V for SFP+ or QSFP transceiver lasers and signal conditioning ICs in telecom line cards. IC Role / Device Role / Timing Role: Point-of-load regulator with tight load regulation (0.08%/A) and fast transient response to handle bursty optical data traffic. Use Value: Integrated 32 mΩ FETs reduce conduction loss; PGOOD confirms regulation before enabling laser driver enable signals. | Use Scenario: Provides 1.2V core voltage for ARM Cortex-A series CPUs in DIN-rail mounted PLC controllers operating from 24V DC input (via intermediate 5V rail). IC Role / Device Role / Timing Role: High-reliability buck stage with thermal shutdown (160°C) and overvoltage protection-meets industrial temperature (-40°C to +125°C junction) requirements. Use Value: HTSSOP exposed pad ensures adequate heat dissipation in sealed enclosures; EN pin supports brown-out recovery sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54428RTQR | 4A, 2.95–6V input, 570 kHz fixed freq, no SYNC pin, smaller 3mm × 3mm QFN | Lacks frequency synchronization and voltage tracking-unsuitable for multi-phase or rail-tracking systems | Choose for space-constrained designs where EMI control via SYNC is not required. |
| MP2307DN-LF-Z | 4A, 4.75–23V input, 500 kHz fixed freq, no PGOOD or SS/TRK, higher RDS(on) | Wider input range but lacks precision enable, tracking, and power-good signaling-limited to basic step-down use cases | Choose only for non-critical 12V-input industrial supplies where sequencing and diagnostics are unnecessary. |
Compared with TPS54428RTQR and MP2307DN-LF-Z, the LM20134MH/NOPB uniquely combines SYNC, SS/TRK, PGOOD, and precision EN in a single 4A buck-making it the only option among the three capable of full power-rail coordination in FPGA/DSP systems.
Availability
LM20134MH/NOPB is available at Aetrix Electronics and suitable for FPGA power delivery, DSP I/O regulation, optical transceiver biasing, and industrial PLC CPU modules requiring stable component supply across extended temperature and long production lifecycles.
Supply support for LM20134MH/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 broad industrial, automotive, and communications design expertise.
The LM20134MH/NOPB belongs to TI's PowerWise® synchronous buck regulator family-engineered for high-efficiency, low-noise point-of-load conversion in space- and thermally constrained digital systems.
FAQ
What is the recommended input capacitor for LM20134MH/NOPB?
A minimum 47 µF low-ESR ceramic capacitor placed close to PVIN and PGND pins is recommended for LM20134MH/NOPB. TI's design guide specifies ≥100 µF total for optimal ripple suppression and transient response-split across multiple X5R/X7R 0805 or 1206 devices to reduce impedance across frequency bands. The LM20134MH/NOPB's 32 mΩ integrated FETs make input capacitance critical for minimizing voltage droop during high di/dt switching events.
Does LM20134MH/NOPB support forced PWM mode at light load?
No, LM20134MH/NOPB does not support forced PWM mode. It automatically enters diode emulation mode below critical conduction boundary (~100 mA), then skips pulses at very light loads to maximize efficiency. This behavior is fixed in silicon and cannot be disabled-LM20134MH/NOPB lacks a MODE pin or register control for constant-frequency operation across all loads.
Can LM20134MH/NOPB be used with ceramic output capacitors only?
Yes, LM20134MH/NOPB is fully compatible with all-ceramic output capacitor designs. Its type-II compensation architecture and wide gain margin accommodate low-ESR ceramics without instability. TI's typical application circuit uses 100 µF X5R ceramics for COUT, and the LM20134MH/NOPB's 0.08%/A load regulation ensures minimal voltage deviation even with zero-ESR caps.
What is the maximum allowable SYNC signal voltage for LM20134MH/NOPB?
The LM20134MH/NOPB SYNC pin accepts logic-high signals up to 6V (absolute max), but requires VIH ≥ 2.0V and VIL ≤ 0.8V for reliable synchronization across temperature. TI specifies 500 kHz–1.5 MHz locking range with TTL/CMOS-compatible levels-exceeding 6V risks permanent damage per absolute maximum ratings. The LM20134MH/NOPB's internal clamp diodes do not protect against overvoltage on SYNC.
How does LM20134MH/NOPB handle overcurrent faults?
LM20134MH/NOPB implements hiccup-mode overcurrent protection: upon current limit detection (6.4A typ), it terminates the high-side pulse, turns on the low-side FET, decrements the reference voltage, and skips subsequent PWM cycles. During hard short circuits, this results in frequency and voltage foldback-whereas brief overloads trigger temporary current limiting without full shutdown. This dual-stage response is intrinsic to the LM20134MH/NOPB's analog control architecture.
LM20134MH/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- PowerWise®
- Package/Case:
- 16-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):
- 0.8V
- Voltage - Output (Max):
- 4.68V
- Current - Output:
- 4A
- Frequency - Switching:
- 410kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM20134MH/NOPB FAQ
1.How can I place an order for LM20134MH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM20134MH/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 LM20134MH/NOPB reliable?
The price and inventory of LM20134MH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM20134MH/NOPB is usually 5 days.
3.What payment methods are accepted for LM20134MH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM20134MH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM20134MH/NOPB?
LM20134MH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM20134MH/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 LM20134MH/NOPB?
For technical support, including LM20134MH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM20134MH/NOPB requirements.
6.How does Aetrix verify that LM20134MH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM20134MH/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 LM20134MH/NOPB meets industry standards.
7.What is the process for return or replacement of LM20134MH/NOPB?
All LM20134MH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM20134MH/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 LM20134MH/NOPB part is unused and in its original packaging.
Return procedure for LM20134MH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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