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Texas Instruments LM2853MHX-1.5/NOPB
- Part No.:
- LM2853MHX-1.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2853MHX-1.5/NOPB.pdf
- Description:
- IC REG BUCK 1.5V 3A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,173
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Product details
Overview
LM2853MHX-1.5/NOPB from Texas Instruments is a 3-A, 550-kHz synchronous buck regulator with factory-programmed 1.5 V output, 40 mΩ high-side and 32 mΩ low-side MOSFETs, input voltage range of 3 V to 5.5 V, and internal type-three compensation - designed for FPGA/DSP core power delivery in space-constrained industrial and networking systems.
For engineers reviewing the LM2853MHX-1.5/NOPB datasheet, LM2853MHX-1.5/NOPB pinout, LM2853MHX-1.5/NOPB application, or LM2853MHX-1.5/NOPB equivalent, this page delivers verified specifications, thermal performance data (RθJA = 38 °C/W), soft-start configuration guidance, and real-world layout considerations for stable 1.5 V/3 A point-of-load conversion.
Technical Context
The LM2853MHX-1.5/NOPB implements voltage-mode control with fixed 550 kHz switching frequency and integrated PWM controller, power switches, and type-three compensation network - eliminating external compensation components. Its dual-rail capability allows independent AVIN (3–5.5 V) and PVIN (1.5–5.5 V) supplies, enabling optimized efficiency in split-rail architectures.
Protection features include thermal shutdown at 165 °C (10 °C hysteresis), current-limit threshold of 3.6–5 A, and UVLO on AVIN with 2.47 V rising threshold and 50–260 mV hysteresis. The device achieves ≤1.5337 V output tolerance over –40 °C to 125 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-set 1.5 V ±1.5% (1.4663–1.5337 V) over full temperature range - ensures precise core rail compliance for 1.5 V FPGA I/O or DSP logic. |
| Max Output Current | 3 A continuous - supports high-current digital loads without external current sharing or derating at 125 °C ambient with proper PCB copper. |
| Input Voltage Range | 3 V to 5.5 V on AVIN; 1.5 V to 5.5 V on PVIN - enables flexible supply sourcing including single 3.3 V or 5 V rails, or split-rail optimization. |
| Switching Frequency | 550 kHz (±35%) - balances EMI filtering complexity and inductor size; supports compact 4.7–6.8 µH output inductors per TI-recommended design. |
| RDS(ON) | 40 mΩ (high-side), 32 mΩ (low-side) - minimizes conduction loss at 3 A, enabling >90% peak efficiency at mid-load with 5 V input. |
| Quiescent Current | 12 µA in shutdown - critical for battery-backed or always-on subsystems requiring ultra-low standby power. |
| Thermal Resistance | RθJA = 38 °C/W (HTSSOP-14 with exposed pad soldered to ground plane) - defines maximum power dissipation limit (~2.1 W at ΔT = 80 °C). |
Pinout & Package
LM2853MHX-1.5/NOPB uses a 14-pin HTSSOP (PWP) package with 5.00 mm × 4.40 mm body and thermally enhanced exposed pad (EP), internally connected to GND but requiring external soldering to a PCB ground plane for optimal thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AVIN) | Control circuit supply | Powers internal bias, reference, and logic; must be ≥3 V and stable before enable - decoupling with 1 µF ceramic near pin improves transient response. |
| 2 (EN) | Enable input | Active-high; internally pulled up - tie to GND to disable; requires ≥75% of AVIN to assert, <25% to deassert; 1.5 µA pullup current. |
| 3 (SGND) | Analog ground | Low-noise return for feedback and sensing circuitry - must be separated from PGND and joined at single point near EP to avoid noise coupling. |
| 4 (SS) | Soft-start capacitor node | Controls ramp rate of output voltage; 450 kΩ internal DAC resistor sets timing - 2.2 nF yields ~3 ms startup; restrict to 1–50 nF for fault recovery. |
| 5, 12, 13 (NC) | No-connect | Must be tied to GND per datasheet - not floating; provides mechanical stability and thermal path when grounded. |
| 6, 7 (PVIN) | Power FET supply | High-current input for MOSFETs; accepts 1.5–5.5 V - place 47 µF ceramic capacitor within 2 mm for low-impedance path and RMS current handling. |
| 8, 9 (SW) | Switch node | Drives external inductor; experiences full VIN-to-GND swing at 550 kHz - keep trace short and wide to minimize EMI and voltage spikes. |
| 10, 11 (PGND) | Power ground | High-current return for MOSFETs and inductor - connect directly to EP and bulk capacitor ground; separate from SGND except at star point. |
| 14 (SNS) | Voltage sense input | Monitors regulated output via 200 kΩ divider; connects to load-side of output filter - routing must avoid SW node and high-dV/dt paths to prevent regulation error. |
| EP | Exposed thermal pad | Internally tied to GND; mandatory solder connection to large PCB ground plane - accounts for >50% of thermal dissipation and improves load regulation stability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Type-Three Compensation | Eliminates external compensation network - reduces BOM count by ≥3 components and removes tuning dependency on output capacitor ESR/ESL. |
| Factory-Programmed Output | Fixed 1.5 V output set during wafer test - avoids external resistor dividers, improves accuracy vs. adjustable regulators, and guarantees monotonic startup. |
| Internal 40 mΩ / 32 mΩ MOSFETs | Enables self-contained 3 A solution with no external switches - simplifies layout, reduces footprint, and ensures matched gate drive timing. |
| Split-Rail Input Architecture | Independent AVIN and PVIN pins allow 3.3 V control logic with 1.8 V power input - improves efficiency in multi-rail systems and reduces AVIN dropout stress. |
| Thermal Shutdown with Hysteresis | 165 °C trip with 10 °C hysteresis prevents thermal runaway - allows safe recovery after overload without manual reset or system intervention. |
Applications
| FPGA Core Power | DSP Local Regulation |
|---|---|
|
Use Scenario: Powering 1.5 V I/O banks or auxiliary logic in Xilinx Artix-7 or Intel MAX 10 FPGAs where tight voltage tolerance and fast load transient response are required. IC Role / Device Role / Timing Role: Primary DC-DC converter delivering regulated 1.5 V at up to 3 A with <1.5% output error across temperature and line variations. Use Value: Enables reliable configuration and operation of FPGA I/O without external supervision, leveraging internal soft-start to prevent inrush-induced rail collapse. |
Use Scenario: Supplying 1.5 V core voltage to TI C674x or Analog Devices SHARC DSPs in audio processing or radar subsystems with strict ripple and noise limits. IC Role / Device Role / Timing Role: Point-of-load regulator with 550 kHz switching synchronized to system clock domains to avoid beat frequencies in sensitive analog sections. Use Value: Delivers <10 mVpp output ripple (with recommended 120–220 µF/70–100 mΩ capacitor) and <2 mV/A load regulation - maintains DSP ADC SNR and PLL jitter specs. |
| Broadband Router SoC Power | Industrial PLC I/O Module |
|
Use Scenario: Generating 1.5 V for Broadcom BCM68xx or Marvell ARMADA SoCs in enterprise routers where thermal density and board area are constrained. IC Role / Device Role / Timing Role: High-efficiency buck stage operating from 3.3 V or 5 V backplane, using HTSSOP-14's exposed pad for passive cooling in fanless enclosures. Use Value: Achieves >92% efficiency at 2 A load (5 V → 1.5 V), reducing heat sink requirements and enabling 25 mm² solution size including magnetics and capacitors. |
Use Scenario: Providing isolated 1.5 V logic supply for RS-485 transceivers and microcontroller peripherals in DIN-rail mounted PLC modules operating at –40 °C to +85 °C. IC Role / Device Role / Timing Role: Industrial-grade DC-DC converter with –40 °C to 125 °C junction rating, UVLO hysteresis, and thermal shutdown for unattended operation. Use Value: Maintains regulation under 100% load at 85 °C ambient (via RθJA = 38 °C/W and 2 oz copper), eliminating need for derating or forced air in sealed 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 |
|---|---|---|---|
| TPS54332DR | 3 A, 28 V max input, adjustable output (0.8–28 V), external compensation, 600 kHz fSW, 115 mΩ/75 mΩ RDS(ON) | Wider input range and adjustable VOUT support multi-rail designs but require external resistors and compensation - increases BOM and layout complexity. | Select when input exceeds 5.5 V or output voltage flexibility is needed; not drop-in due to different pinout and compensation requirements. |
| MP2332HGRT-Z | 3 A, 4.5–28 V input, fixed 1.5 V option, 500 kHz fSW, 60 mΩ/35 mΩ RDS(ON), QFN-10 package | Higher RDS(ON) increases conduction loss; smaller QFN-10 lacks exposed pad thermal mass - requires more aggressive PCB copper for same thermal performance. | Choose for cost-sensitive, lower-power applications where 38 °C/W thermal resistance is not critical; not pin-compatible with HTSSOP-14 layout. |
Compared with TPS54332DR and MP2332HGRT-Z, the LM2853MHX-1.5/NOPB offers superior thermal performance (38 °C/W vs. ≥55 °C/W), tighter factory-set 1.5 V accuracy (±1.5% vs. ±2%), and integrated compensation - making it optimal for space- and thermal-constrained 3 A point-of-load designs where fixed output suffices.
Availability
LM2853MHX-1.5/NOPB is available at Aetrix Electronics and suitable for FPGA core power, DSP local regulation, and broadband networking infrastructure requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for LM2853MHX-1.5/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 LM2853 family was engineered for high-density, low-voltage point-of-load applications in communications, computing, and industrial systems - emphasizing integration, thermal robustness, and ease of implementation without external compensation.
FAQ
What is the output voltage tolerance of the LM2853MHX-1.5/NOPB over temperature?
The LM2853MHX-1.5/NOPB has a guaranteed output voltage tolerance of ±1.5% (1.4663 V to 1.5337 V) across the full operating junction temperature range of –40 °C to 125 °C, as specified in the Electrical Characteristics table under VOUT parameter for the 1.5 V option.
Does the LM2853MHX-1.5/NOPB require external compensation components?
No, the LM2853MHX-1.5/NOPB integrates a complete type-three compensation network - eliminating the need for external capacitors or resistors in the feedback loop. This reduces component count, saves board space, and removes compensation tuning dependencies on output capacitor ESR or ESL.
How should the exposed thermal pad (EP) of the LM2853MHX-1.5/NOPB be connected?
The exposed pad of the LM2853MHX-1.5/NOPB must be soldered to a solid PCB ground plane using ≥9 thermal vias (0.3 mm diameter) connecting to inner or bottom-layer ground planes. It is internally tied to GND but cannot serve as the primary GND connection - improper soldering degrades thermal performance and regulation stability.
Can the LM2853MHX-1.5/NOPB operate with different voltages on AVIN and PVIN?
Yes, the LM2853MHX-1.5/NOPB supports split-rail operation: AVIN may be supplied from 3–5.5 V (e.g., 3.3 V for control logic), while PVIN can be as low as 1.5 V (e.g., 1.8 V for power stage), provided PVIN ≤ AVIN. This configuration improves efficiency and reduces dropout stress on the control supply.
What is the recommended soft-start capacitor value for the LM2853MHX-1.5/NOPB?
A 2.2 nF ceramic capacitor on the SS pin yields approximately a 3 ms startup time for the LM2853MHX-1.5/NOPB. The datasheet restricts CSS to 1–50 nF to ensure proper fault recovery - values outside this range may impair short-circuit or UVLO restart behavior.
LM2853MHX-1.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 3A
- Frequency - Switching:
- 550kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-HTSSOP
LM2853MHX-1.5/NOPB FAQ
1.How can I place an order for LM2853MHX-1.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2853MHX-1.5/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 LM2853MHX-1.5/NOPB reliable?
The price and inventory of LM2853MHX-1.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2853MHX-1.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM2853MHX-1.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2853MHX-1.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2853MHX-1.5/NOPB?
LM2853MHX-1.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2853MHX-1.5/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 LM2853MHX-1.5/NOPB?
For technical support, including LM2853MHX-1.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2853MHX-1.5/NOPB requirements.
6.How does Aetrix verify that LM2853MHX-1.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2853MHX-1.5/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 LM2853MHX-1.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM2853MHX-1.5/NOPB?
All LM2853MHX-1.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2853MHX-1.5/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 LM2853MHX-1.5/NOPB part is unused and in its original packaging.
Return procedure for LM2853MHX-1.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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