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Texas Instruments LM20323MHE/NOPB
- Part No.:
- LM20323MHE/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 20-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM20323MHE/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 20HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:177
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Product details
Overview
LM20323MHE/NOPB from Texas Instruments is a 36V, 3A synchronous buck regulator with fixed 500 kHz switching frequency, integrated 130 mΩ high-side and 110 mΩ low-side MOSFETs, and precision 0.8 V ±1.5% feedback reference-designed for point-of-load regulation in FPGA, DSP, and ASIC power supplies.
For engineers reviewing the LM20323MHE/NOPB datasheet, LM20323MHE/NOPB pinout, LM20323MHE/NOPB application, or LM20323MHE/NOPB equivalent, key selection considerations include input voltage range (4.5–36 V), peak current limit (5.2 A), soft-start programmability, PGOOD signaling, and thermal shutdown at 170°C.
Technical Context
The LM20323MHE/NOPB implements peak current mode control with non-linear slope compensation to maintain stability across output voltages from 0.8 V to VIN−2 V. Its externally compensated error amplifier (gm = 515 µmho, GBW = 7 MHz) interfaces via COMP and AGND pins for loop tuning with RC/CC networks.
It integrates OVP (110% VFB threshold), UVLO (4.25 V rising, 350 mV hysteresis), and precision enable (1.25 V threshold, 50 mV hysteresis) for robust sequencing. The SS/TRK pin supports both capacitor-programmed soft-start and external voltage tracking without sinking pre-biased outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 36 V - supports wide industrial and automotive bus rails without external step-down. |
| Output Current | 3 A continuous - delivers full rated load without derating up to +125°C junction temperature. |
| Switching Frequency | 500 kHz (±6%) - enables compact 2.2–5.6 µH inductors while maintaining >93% peak efficiency. |
| Feedback Accuracy | ±1.5% at 0.8 V - ensures tight output regulation for low-voltage logic cores (e.g., 1.2 V, 0.85 V). |
| Current Limit | 5.2 A peak - allows use of smaller inductors with lower saturation current ratings. |
| Thermal Shutdown | 170°C with 20°C hysteresis - provides fail-safe protection during overload or poor heatsinking. |
| PGOOD Threshold | 95% VFB rising / 2% hysteresis - enables reliable power sequencing with <20 µs deglitch timing. |
Pinout & Package
LM20323MHE/NOPB uses a thermally enhanced 20-pin HTSSOP package with exposed pad (PWP0020A), requiring PCB ground plane connection for θJA = 27°C/W (0 LFM airflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SS/TRK | Soft-start/Tracking control | 4.5 µA internal current source charges external capacitor; also accepts external ramp for rail tracking. |
| 2 FB | Feedback input | Connects to resistor divider; referenced to precise 0.8 V internal bandgap (±1.5%). |
| 3 PGOOD | Open-drain power-good flag | Sinks ≥0.6 mA when VOUT within ±5% of target; requires external 10–100 kΩ pull-up. |
| 4 COMP | Error amplifier output | Interface for Type II/III compensation network between COMP and AGND. |
| 5,6,15,16 VIN | Main input supply | Accepts 4.5–36 V; multiple pins reduce IR drop and improve high-current routing. |
| 7,8,13,14 SW | Switch node | Drain of HS-FET / source of LS-FET; connects to external inductor and bootstrap capacitor. |
| 9,10,11 GND | Power ground | Common return for MOSFETs; separate from AGND to minimize noise coupling. |
| 12 AGND | Analog ground | Reference for FB, COMP, EN, SS/TRK; must be star-connected to avoid control-loop instability. |
| 17 BOOT | Bootstrap supply | Charged via internal diode from VCC; requires 10–100 nF ceramic cap from BOOT to SW. |
| 18 VCC | Bias regulator output | Regulated ~5.5 V (up to 7.2 V VIN); powers gate drivers; requires 0.1–1 µF decoupling. |
| 19 EN | Enable with UVLO | 1.25 V threshold enables operation; 50 mV hysteresis prevents chatter; internal 2 µA pull-up if floating. |
| 20 NC | No connection | Must be connected to GND per datasheet recommendation. |
| EP | Exposed pad | Internally weakly tied to GND; soldered to PCB ground plane for thermal conduction (θJC = 5.6°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | 130 mΩ HS + 110 mΩ LS MOSFETs eliminate external switches and reduce BOM count. |
| Pre-biased Startup | Non-sinking behavior prevents damage to FPGA/ASIC outputs when VOUT > 0 at startup. |
| Programmable Soft-start | External capacitor on SS/TRK sets monotonic rise time; avoids input inrush and output overshoot. |
| Non-linear Slope Compensation | Parabolic ramp adapts to output voltage, ensuring stable current-mode control across 0.8–32 V VOUT. |
| Robust Protection Suite | OVP, UVP, cycle-by-cycle current limit, thermal shutdown, and PGOOD provide system-level fault coverage. |
Applications
| FPGA Core Supply | DSP I/O Rail |
|---|---|
Use Scenario: Powers 1.2 V core of Xilinx Artix-7 FPGA with dynamic current demand up to 2.8 A. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering tightly regulated, low-noise DC from 12 V intermediate bus. Use Value: 0.8 V reference accuracy and 500 kHz switching enable <15 mV ripple at 3 A, meeting FPGA core voltage tolerance. | Use Scenario: Supplies 3.3 V I/O bank for TI C66x DSP in telecom baseband processing. IC Role / Device Role / Timing Role: Secondary buck converter tracking main core rail during power-up sequencing. Use Value: SS/TRK pin enables monotonic 3.3 V ramp synchronized to 1.0 V core, preventing I/O latch-up. |
| Automotive Infotainment SoC | Industrial PLC CPU Module |
Use Scenario: Powers quad-core ARM Cortex-A53 SoC (1.1 V @ 2.5 A) in vehicle head unit with 9–16 V battery input. IC Role / Device Role / Timing Role: High-input-voltage buck regulator with UVLO set to 9.5 V via EN resistor divider. Use Value: 4.5–36 V input range and 170°C thermal shutdown ensure reliable operation under cold-crank and load-dump conditions. | Use Scenario: Generates 2.5 V for ARM-based PLC controller operating in 0–70°C ambient with 24 V DC field supply. IC Role / Device Role / Timing Role: Isolated point-of-load regulator with PGOOD enabling watchdog reset and firmware boot validation. Use Value: PGOOD delay (<20 µs) and 95% VFB threshold allow deterministic power-on reset assertion before CPU initialization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM20323MHX/NOPB | Tape-and-reel packaging variant; identical electrical specs and pinout. | No functional difference; selected for automated SMT assembly vs. sample evaluation. | Choose LM20323MHX/NOPB for volume production; LM20323MHE/NOPB for prototyping or small-batch builds. |
| TPS54332DR | 3.5 A rating, 1.5–28 V input, 570 kHz fSW, no PGOOD, different pinout (14-pin SOIC). | Lacks rail tracking, PGOOD, and pre-bias startup; requires redesign of compensation and layout. | Select only if cost sensitivity outweighs feature requirements and board rework is acceptable. |
Compared with LM20323MHX/NOPB, the LM20323MHE/NOPB offers identical performance in tube packaging for flexibility in low-volume design-in; versus TPS54332DR, it provides critical features-PGOOD, SS/TRK, and pre-bias startup-for complex multi-rail systems without layout changes.
Availability
LM20323MHE/NOPB is available at Aetrix Electronics and suitable for FPGA power delivery, DSP I/O regulation, and automotive infotainment SoC supplies requiring stable component supply and long-term industrial availability.
Supply support for LM20323MHE/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 LM20323 product line delivers fully integrated, easy-to-design synchronous buck regulators optimized for high-voltage input (up to 36 V) and medium-current (up to 3 A) point-of-load applications in industrial, automotive, and communications infrastructure.
FAQ
What is the maximum input voltage rating for LM20323MHE/NOPB?
The absolute maximum input voltage for LM20323MHE/NOPB is +38 V, but the recommended operating range is +4.5 V to +36 V. Exceeding 36 V may trigger overvoltage protection or cause reliability degradation. The device's internal OVP circuit activates at 110% of the feedback reference (i.e., ~0.88 V at FB), corresponding to ~110% of the programmed output voltage.
Does LM20323MHE/NOPB support pre-biased output startup?
Yes, LM20323MHE/NOPB supports pre-biased startup: when the output voltage is non-zero at power-on, the device will not sink current from the output until the soft-start ramp exceeds the FB pin voltage. This prevents reverse current flow through load parasitics-critical for powering FPGAs and ASICs sharing supply rails.
What is the purpose of the SS/TRK pin on LM20323MHE/NOPB?
The SS/TRK pin on LM20323MHE/NOPB serves dual functions: (1) soft-start control via an external capacitor that sets monotonic output voltage ramp time, and (2) voltage tracking by accepting an external ramp signal to synchronize startup with another power rail. An internal 4.5 µA current source enables simple capacitor-based timing.
How does the non-linear slope compensation in LM20323MHE/NOPB improve stability?
LM20323MHE/NOPB uses a parabolic (non-linear) slope compensation ramp that scales with output voltage-providing more compensation at high VOUT and less at low VOUT. This maintains optimal phase margin across the full 0.8–32 V output range, eliminating need for manual compensation adjustment when changing output voltage.
Can LM20323MHE/NOPB be used without an external compensation network?
No, LM20323MHE/NOPB requires an external RC/CC network connected between COMP and AGND for loop stability. The error amplifier is intentionally un-compensated internally; typical designs use a Type II network (e.g., 32.4 kΩ + 4.7 nF for 3.3 V/12 V input) to achieve >60° phase margin and adequate transient response.
LM20323MHE/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-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):
- 4.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 25.2V
- Current - Output:
- 3A
- Frequency - Switching:
- 520kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-HTSSOP
LM20323MHE/NOPB FAQ
1.How can I place an order for LM20323MHE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM20323MHE/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 LM20323MHE/NOPB reliable?
The price and inventory of LM20323MHE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM20323MHE/NOPB is usually 5 days.
3.What payment methods are accepted for LM20323MHE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM20323MHE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM20323MHE/NOPB?
LM20323MHE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM20323MHE/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 LM20323MHE/NOPB?
For technical support, including LM20323MHE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM20323MHE/NOPB requirements.
6.How does Aetrix verify that LM20323MHE/NOPB is sourced from the original manufacturer or authorized distributors?
All LM20323MHE/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 LM20323MHE/NOPB meets industry standards.
7.What is the process for return or replacement of LM20323MHE/NOPB?
All LM20323MHE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM20323MHE/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 LM20323MHE/NOPB part is unused and in its original packaging.
Return procedure for LM20323MHE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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