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Texas Instruments LM2853MH-1.5/NOPB
- Part No.:
- LM2853MH-1.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2853MH-1.5/NOPB.pdf
- Description:
- IC REG BUCK 1.5V 3A 14HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:350
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Product details
Overview
LM2853MH-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, internal type-three compensation, and 12 µA shutdown current. It operates from 3 V to 5.5 V input and delivers precise point-of-load regulation for FPGA core supplies.
For engineers reviewing the LM2853MH-1.5/NOPB datasheet, LM2853MH-1.5/NOPB pinout, LM2853MH-1.5/NOPB application, or LM2853MH-1.5/NOPB equivalent, this page provides verified specifications, thermal performance data (RθJA = 38 °C/W), soft-start configuration guidance, and validated alternative options for 1.5 V DC-DC conversion in space-constrained industrial and communications systems.
Technical Context
The LM2853MH-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 designs.
Protection features include thermal shutdown at 165 °C (10 °C hysteresis), UVLO on AVIN (2.47 V rising threshold), and peak current limiting at 3.6–5 A. The device supports soft-start via external capacitor (1–50 nF) tied to SS pin, with internal 450 kΩ pullup enabling precise startup timing control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-set 1.5 V ±1.12% over –40°C to 125°C junction temperature |
| Max Output Current | 3 A continuous load with internal 40 mΩ/32 mΩ synchronous MOSFETs |
| Input Voltage Range | 3 V to 5.5 V on AVIN; 1.5 V to 5.5 V on PVIN - enables flexible split-rail operation |
| Switching Frequency | 550 kHz nominal (325–725 kHz range) - balances efficiency, size, and EMI |
| Quiescent Current | 12 µA in shutdown mode - critical for battery-backed or always-on systems |
| Junction-to-Ambient RθJA | 38 °C/W in HTSSOP-14 package - requires minimal PCB copper area for thermal management |
| Soft-Start Resistance | 450 kΩ internal DAC resistor - sets RC time constant with external CSS capacitor |
Pinout & Package
LM2853MH-1.5/NOPB uses a 14-pin HTSSOP (PWP) package with 5.00 mm × 4.40 mm body and exposed thermal pad internally connected to GND. The exposed pad must be soldered to an external ground plane for thermal and electrical performance but cannot serve as primary GND connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AVIN) | Control circuit supply | Provides bias for internal logic; must be ≥3 V and ≥PVIN for proper operation |
| 2 (EN) | Enable input | Active-high; internally pulled up - device powers on by default unless driven low |
| 3 (SGND) | Low-noise analog ground | Separate return path for error amplifier and reference to minimize noise coupling |
| 4 (SS) | Soft-start control | External capacitor sets startup ramp time; 1–50 nF range ensures controlled inrush |
| 5,12,13 (NC) | No-connect | Must be tied to ground per datasheet - not floating or left unconnected |
| 6,7 (PVIN) | Power switch supply | Feeds high-current FETs; requires low-ESR bulk capacitor placed adjacent to pins |
| 8,9 (SW) | Switch node | Connects to output inductor; high dV/dt node requiring short, wide trace and EMI mitigation |
| 10,11 (PGND) | Power ground | High-current return for FETs; must tie to SGND at single point near IC |
| 14 (SNS) | Voltage sense input | Monitors regulated output via 200 kΩ divider; connect directly to load for accurate remote sensing |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Type-Three Compensation | Eliminates external compensation network - reduces BOM count and layout sensitivity |
| Factory-Programmed Output | 1.5 V output set permanently in EEPROM - no external resistors required for feedback |
| Exposed Thermal Pad (HTSSOP) | Enables 38 °C/W RθJA - supports full 3 A load without heatsink in standard 2-layer PCB |
| Dual-Rail Input Architecture | Independent AVIN/PVIN supplies allow optimization of control logic and power stage efficiency |
| UVLO with Hysteresis | 2.47 V rising threshold + 50–260 mV hysteresis prevents oscillation during brownout conditions |
Applications
| FPGA Core Power Supply | ASIC Point-of-Load Regulation |
|---|---|
Use Scenario: Providing stable 1.5 V rail to Xilinx Spartan-6 or Intel Cyclone IV FPGA core logic under dynamic load transients up to 3 A. IC Role / Device Role / Timing Role: Primary synchronous buck converter delivering tightly regulated voltage with <±1.12% tolerance across temperature and line variations. Use Value: Internal type-three compensation and 550 kHz switching enable compact 4-component solution (CIN, CSS, LO, CO) meeting FPGA transient response requirements without external loop tuning. |
Use Scenario: Local 1.5 V supply for ARM-based SoC subsystems in industrial gateways, where board space and thermal constraints limit discrete solutions. IC Role / Device Role / Timing Role: Standalone DC-DC regulator converting 5 V system rail to 1.5 V core voltage with integrated power FETs and protection. Use Value: 12 µA shutdown current and split-rail inputs reduce standby power; exposed pad ensures thermal reliability at 3 A in 5.0 × 4.4 mm footprint. |
| Broadband Communications PSU | Industrial PLC I/O Module |
Use Scenario: Powering 1.5 V SerDes interfaces in Ethernet PHY modules operating in ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: High-efficiency step-down regulator maintaining output stability during burst-mode traffic-induced load steps. Use Value: 40 mΩ/32 mΩ RDS(on) FETs and 550 kHz operation deliver >90% efficiency at 2 A, minimizing heat generation in dense line-card layouts. |
Use Scenario: Generating isolated 1.5 V logic supply in DIN-rail mounted programmable logic controllers with extended temperature requirements. IC Role / Device Role / Timing Role: Robust buck regulator surviving industrial transients, with thermal shutdown (165°C) and UVLO protection. Use Value: Guaranteed operation from –40°C to 125°C junction temperature and 38 °C/W thermal resistance support convection-cooled enclosures without forced air. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS54302DDCR | 3 A, 1.5 V fixed-output, 500 kHz, 3.5–28 V input - wider VIN range but higher quiescent current (19 µA vs 12 µA) | Preferred for systems with >5.5 V input rails; less suitable for low-VIN battery backup due to minimum 3.5 V requirement | Select when input exceeds 5.5 V or when higher input voltage margin is needed; verify thermal performance with RθJA = 105 °C/W |
| MP2332HGRT-Z | 3 A, adjustable 0.8–6 V output, 500 kHz, 4.5–28 V input - requires external feedback resistors; no factory-programmed 1.5 V option | Used where output voltage flexibility is required across multiple board revisions; adds two resistors and layout complexity | Choose if future designs may require different output voltages; avoid if strict 1.5 V fixed output and minimal BOM are priorities |
Compared with TPS54302DDCR and MP2332HGRT-Z, LM2853MH-1.5/NOPB offers lower shutdown current, tighter output tolerance (±1.12%), and zero-resistor configuration - making it optimal for space-constrained, low-power 3–5.5 V input systems demanding production-ready 1.5 V regulation.
Availability
LM2853MH-1.5/NOPB is available at Aetrix Electronics and suitable for FPGA core power, ASIC point-of-load regulation, and broadband communications infrastructure requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LM2853MH-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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and communications markets.
The LM2853 product line delivers highly integrated synchronous buck regulators targeting space- and thermally constrained point-of-load applications, emphasizing minimal external component count and factory-configured simplicity for rapid design-in.
FAQ
What is the output voltage tolerance of LM2853MH-1.5/NOPB over temperature?
The LM2853MH-1.5/NOPB maintains output voltage within ±1.12% of 1.5 V (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 LM2853MH-1.5/NOPB require external feedback resistors?
No, LM2853MH-1.5/NOPB does not require external feedback resistors. Its 1.5 V output is factory-programmed into internal EEPROM and delivered via a fixed 200 kΩ sense divider connected to the SNS pin - eliminating resistor selection, placement, and tolerance errors.
What is the recommended soft-start capacitor value for LM2853MH-1.5/NOPB?
The recommended soft-start capacitor for LM2853MH-1.5/NOPB is 2.2 nF, which yields approximately 3 ms startup time. The device supports 1 nF to 50 nF range; values outside this range risk uncontrolled inrush or failure to start under fault conditions like short circuits.
Can LM2853MH-1.5/NOPB operate with separate AVIN and PVIN supplies?
Yes, LM2853MH-1.5/NOPB supports split-rail operation: AVIN (3–5.5 V) powers control circuitry while PVIN (1.5–5.5 V) powers the power FETs. PVIN must be ≤ AVIN, and output filter components should be selected based on PVIN level per datasheet guidelines.
What thermal performance can be expected from LM2853MH-1.5/NOPB in a standard PCB layout?
In a standard 2-layer PCB with the exposed thermal pad fully soldered to a solid ground plane, LM2853MH-1.5/NOPB achieves a junction-to-ambient thermal resistance of 38 °C/W. This allows full 3 A continuous operation at ambient temperatures up to 85°C without additional heatsinking.
LM2853MH-1.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 14-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
LM2853MH-1.5/NOPB FAQ
1.How can I place an order for LM2853MH-1.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2853MH-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 LM2853MH-1.5/NOPB reliable?
The price and inventory of LM2853MH-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 LM2853MH-1.5/NOPB is usually 5 days.
3.What payment methods are accepted for LM2853MH-1.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2853MH-1.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2853MH-1.5/NOPB?
LM2853MH-1.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2853MH-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 LM2853MH-1.5/NOPB?
For technical support, including LM2853MH-1.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2853MH-1.5/NOPB requirements.
6.How does Aetrix verify that LM2853MH-1.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2853MH-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 LM2853MH-1.5/NOPB meets industry standards.
7.What is the process for return or replacement of LM2853MH-1.5/NOPB?
All LM2853MH-1.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2853MH-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 LM2853MH-1.5/NOPB part is unused and in its original packaging.
Return procedure for LM2853MH-1.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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