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Texas Instruments LM20146MH/NOPB
- Part No.:
- LM20146MH/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM20146MH/NOPB.pdf
- Description:
- IC REG BUCK ADJ 6A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:550
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Product details
Overview
LM20146MH/NOPB from Texas Instruments is a synchronous buck DC-DC regulator delivering up to 6A continuous output current, operating from 2.95V–5.5V input, with adjustable switching frequency (250–750 kHz), integrated 16mΩ/20mΩ FETs, and precision 0.8V feedback reference-used in FPGA, ASIC, and DSP core power rails.
For engineers reviewing the LM20146MH/NOPB datasheet, LM20146MH/NOPB pinout, LM20146MH/NOPB application, or LM20146MH/NOPB equivalent, key selection considerations include pre-biased startup capability, peak current mode control with nonlinear slope compensation, PGOOD open-drain signaling, soft-start/tracking dual-function pin, and thermal shutdown at 160°C.
Technical Context
The LM20146MH/NOPB implements peak current mode control with parabolic slope compensation to maintain stability across 0.8V–5.5V output ranges and duty cycles >50%. Its error amplifier features 510 µmho transconductance and 2000 V/V gain, compensated externally via COMP pin with RC network.
It integrates dual N-channel MOSFETs (16mΩ low-side, 20mΩ high-side), internal 2.7V VCC regulator, analog bias rail (AVIN) with RC filtering, and precision enable with 1.18V turn-on threshold and 66mV hysteresis-enabling tight supply sequencing and monotonic start-up into pre-biased loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 6A continuous-supports high-current digital loads without external current sharing. |
| Input Voltage Range | 2.95V to 5.5V-compatible with 3.3V and 5V system buses. |
| Feedback Reference | 0.8V ±1.5%-enables precise low-voltage regulation down to sub-1V core supplies. |
| Switching Frequency | 250 kHz to 750 kHz-adjustable via RT-to-GND resistor for EMI optimization and inductor size trade-off. |
| Current Limit Threshold | 7.35A to 9.35A-tight ±10% tolerance over temperature minimizes inductor saturation margin. |
| Peak Efficiency | 97%-achieved with low RDS(on) FETs and diode emulation mode at light load. |
| Thermal Shutdown | 160°C with 10°C hysteresis-protects against sustained overload or poor PCB thermal design. |
Pinout & Package
LM20146MH/NOPB uses a 16-pin HTSSOP package with exposed thermal pad (EP), requiring solder connection to PCB ground plane for effective heat dissipation and stable operation at full 6A load.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SS/TRK | Soft-start or voltage tracking input | 5 µA internal current source charges external capacitor for controlled ramp; also accepts external voltage for rail tracking. |
| FB | Feedback sense node | Connects to resistor divider; regulates output by maintaining 0.8V at this pin. |
| PGOOD | Open-drain power-good indicator | Asserts low when VOUT is within ±6% of target; requires 10–100 kΩ pull-up. |
| COMP | Error amplifier compensation node | External RC network sets loop crossover and phase margin for stability with any output capacitor type. |
| PVIN, PGND (x2 each) | Power input and ground terminals | High-current paths for switch node; must be routed with low-inductance, wide copper areas. |
| SW | Switch node | Drives external inductor; exhibits fast edges and ringing-requires careful layout and optional snubber. |
| EN | Precision enable input | Turns device on at 1.18V (typical); hysteresis prevents chatter during slow-rising supplies. |
| RT | Oscillator frequency set | Resistor to ground selects switching frequency; 49.9 kΩ yields ~750 kHz, 249 kΩ yields ~260 kHz. |
| VCC | Internal 2.7V bias supply | Bypass with 1 µF ceramic capacitor close to pin; powers internal logic and gate drivers. |
| AVIN / AGND | Analog supply and quiet ground | Must connect AVIN to PVIN via RC filter; AGND isolated from PGND to reduce noise coupling into error amp. |
Key Features
| Feature | Design Value |
|---|---|
| Pre-biased startup | Starts without pulling down existing VOUT, preventing damage to downstream logic in multi-rail systems. |
| Nonlinear slope compensation | Parabolic ramp adapts to output voltage-ensures stability across full 0.8V–5.5V range without manual tuning. |
| Diode emulation mode | Disables reverse inductor current at light load, eliminating body-diode conduction loss and improving efficiency below 100 mA. |
| Integrated OVP/UVP/OTP | Overvoltage protection triggers at 108% of VFB; under-voltage lockout activates at 2.7V with 45 mV hysteresis. |
| Adjustable soft-start | External capacitor on SS/TRK sets ramp time; default 1 ms internal ramp if unconnected. |
Applications
| Processor Core Supply | FPGA I/O Bank Regulation |
|---|---|
Use Scenario: Powering ARM Cortex-A series or Intel Atom processor cores requiring tightly regulated 0.85V–1.2V at up to 6A. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing dynamic voltage scaling (DVS) support via FB divider and EN sequencing. Use Value: 0.8V reference accuracy ±1.5% and <0.08%/A load regulation ensure voltage stays within CPU VID tolerance across full load range. | Use Scenario: Delivering clean, sequenced 1.8V or 2.5V to FPGA I/O banks with strict rail-ordering requirements. IC Role / Device Role / Timing Role: Secondary regulator tracking a higher-voltage rail (e.g., 3.3V) using SS/TRK pin for synchronized ramp-up. Use Value: Voltage tracking capability eliminates need for external tracking ICs and ensures monotonic startup without bus contention. |
| ASIC Memory Interface | Optical Transceiver Bias |
Use Scenario: Supplying DDR3/DDR4 memory termination and interface circuitry in networking switches with bursty load profiles. IC Role / Device Role / Timing Role: High-transient-response buck converter managing rapid 0→4A load steps while maintaining <±1.5% output deviation. Use Value: Peak current mode control with 100 ns minimum on-time and fast PGOOD deglitch (16 µs) enables reliable response to nanosecond-scale load changes. | Use Scenario: Generating stable 3.3V bias for SFP+ or QSFP optical modules where EMI-sensitive analog circuits coexist with digital logic. IC Role / Device Role / Timing Role: Low-noise, frequency-adjustable regulator operating at 450 kHz to avoid interference with 10G serial data bands. Use Value: Adjustable RT pin allows EMI tuning; AVIN/AGND separation and 1.18V precision EN minimize supply-induced jitter in laser driver circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54620RGYT | Higher 6.5A current rating; 2.95–17V input; fixed 600 kHz or adjustable 200–1600 kHz; no pre-bias startup. | Supports wider input range and higher current but lacks pre-biased startup and has looser 0.804V FB tolerance. | Choose for industrial 12V-input systems needing higher headroom; avoid where pre-bias is mandatory. |
| MP2315DJ-LF-Z | 4A rated; 4.5–26V input; fixed 500 kHz; smaller 8-pin SOIC; no SS/TRK or tracking function. | Lacks soft-start adjustment, voltage tracking, and PGOOD-suited only for simple point-of-load with fixed output. | Select for cost-sensitive, low-complexity 5V-to-3.3V conversion; not suitable for FPGA/DSP sequencing or dynamic VOUT. |
Compared with TPS54620RGYT and MP2315DJ-LF-Z, the LM20146MH/NOPB uniquely combines pre-biased startup, dual-function SS/TRK pin, and ±1.5% FB accuracy-making it optimal for tightly sequenced, low-voltage digital power where output monotonicity and precision regulation are critical.
Availability
LM20146MH/NOPB is available at Aetrix Electronics and suitable for FPGA core power, ASIC memory interface, and optical transceiver bias applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM20146MH/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 power conversion ICs.
The LM20146MH/NOPB belongs to TI's high-current synchronous buck regulator product line, designed specifically for low-voltage, high-efficiency point-of-load power in space-constrained digital systems such as communications infrastructure and programmable logic.
FAQ
What is the minimum recommended output voltage for LM20146MH/NOPB?
The LM20146MH/NOPB supports an adjustable output voltage down to 0.8V, set by the feedback resistor divider connected to the FB pin. This 0.8V reference is accurate to ±1.5% over temperature and line, enabling stable regulation for modern sub-1V processor cores. Operation below 0.8V is not supported, as the internal error amplifier reference is fixed at that value.
Does LM20146MH/NOPB support startup into a pre-biased output?
Yes, the LM20146MH/NOPB explicitly supports pre-biased startup: when VOUT is non-zero at enable, the device will not sink current or pull the output low. Instead, it waits until the SS/TRK voltage exceeds the FB voltage before initiating switching-preventing damage to downstream logic in multi-rail FPGA or ASIC systems.
How is switching frequency adjusted on LM20146MH/NOPB?
Switching frequency on the LM20146MH/NOPB is set by connecting a resistor from the RT pin to ground. A 49.9 kΩ resistor yields ~750 kHz (typ), while 249 kΩ yields ~260 kHz (typ). The relationship is approximately linear across 250–750 kHz, and the RT pin draws negligible current-allowing precise EMI tuning without affecting bias networks.
What thermal management is required for LM20146MH/NOPB at 6A load?
At 6A continuous load, the LM20146MH/NOPB requires the exposed thermal pad (EP) to be soldered to a solid PCB ground plane with ≥4 thermal vias. With proper layout on a 2-layer board, θJA is 25°C/W; junction temperature must stay ≤125°C. Derating is advised above 60°C ambient, and thermal shutdown activates at 160°C with 10°C hysteresis.
Can LM20146MH/NOPB operate with ceramic output capacitors only?
Yes, the LM20146MH/NOPB is fully compatible with all-ceramic output capacitor designs. Its peak current mode control and external COMP compensation allow stable operation with low-ESR ceramics. Typical designs use 100 µF X5R/X7R MLCCs; ESR-related ripple is minimized, and transient response improves due to faster loop bandwidth achievable with ceramic-only COUT.
LM20146MH/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- 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:
- 6A
- Frequency - Switching:
- 260kHz ~ 750kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM20146MH/NOPB FAQ
1.How can I place an order for LM20146MH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM20146MH/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 LM20146MH/NOPB reliable?
The price and inventory of LM20146MH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM20146MH/NOPB is usually 5 days.
3.What payment methods are accepted for LM20146MH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM20146MH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM20146MH/NOPB?
LM20146MH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM20146MH/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 LM20146MH/NOPB?
For technical support, including LM20146MH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM20146MH/NOPB requirements.
6.How does Aetrix verify that LM20146MH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM20146MH/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 LM20146MH/NOPB meets industry standards.
7.What is the process for return or replacement of LM20146MH/NOPB?
All LM20146MH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM20146MH/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 LM20146MH/NOPB part is unused and in its original packaging.
Return procedure for LM20146MH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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