My Inquiry
My Account
Texas Instruments LMR14203XMKE/NOPB
- Part No.:
- LMR14203XMKE/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LMR14203XMKE/NOPB.pdf
- Description:
- IC REG BUCK ADJ 300MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:2,074
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMR14203XMKE/NOPB from Texas Instruments is a PWM synchronous step-down DC/DC regulator IC with 4.5V–42V input range, fixed 1.25 MHz switching frequency, 0.765V feedback reference, 0.3A output current capability, and internal 0.9Ω high-side MOSFET. It delivers regulated 1.2V or 3.3V outputs in space-constrained industrial power meters and portable instrumentation.
For engineers reviewing the LMR14203XMKE/NOPB datasheet, LMR14203XMKE/NOPB pinout, LMR14203XMKE/NOPB application, or LMR14203XMKE/NOPB equivalent, key selection criteria include input voltage range (4.5–42V), output current limit (525 mA peak), thermal shutdown behavior (175°C trip), soft-start implementation via SHDN pin, and SOT-23-6 package compatibility with high-density PCB layouts.
Technical Context
The LMR14203XMKE/NOPB implements current-mode PWM control with an integrated high-side N-channel MOSFET and internal compensation. Its 1.25 MHz fixed-frequency operation enables compact external components while maintaining low output ripple under dynamic load conditions.
It features dedicated protection circuitry including input UVLO (4.4V turn-on, 3.5V turn-off), gate-drive under-voltage lockout, cycle-by-cycle current limiting (525 mA typical), and thermal shutdown (175°C trip, 155°C release). The FB pin uses a precise 0.765V reference to set output voltage via external resistor divider.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 42V - supports direct regulation from 5V, 12V, 24V, and 36V unregulated rails without pre-regulation. |
| Output Current | Up to 0.3A continuous - sufficient for powering microcontrollers, sensors, and analog front-ends in portable equipment. |
| Switching Frequency | 1.25 MHz (±25%) - enables use of small 10–22 µH inductors and ceramic capacitors for minimal board area. |
| Feedback Reference | 0.765V ±1.5% - allows accurate output setting from 0.765V to 34V using standard resistor values (100Ω–10kΩ). |
| Quiescent Current | 16 µA typical in shutdown - extends battery life in always-on monitoring systems. |
| Thermal Shutdown | 175°C trip temperature - protects device during overload or poor heatsinking; auto-recovery at 155°C. |
| Max Duty Cycle | 87% - supports high step-down ratios (e.g., 12V→1.2V) while maintaining stable regulation. |
Pinout & Package
SOT-23-6 thin package (DDC0006A), 2.97 mm × 1.65 mm × 1.0 mm, RoHS-compliant, SN lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CB | Bootstrap capacitor connection | Provides gate drive voltage for internal high-side FET; requires 0.15 µF ceramic cap between CB and SW. |
| GND | Power ground reference | Return path for internal circuits and external feedback network; must connect directly to system ground plane at COUT. |
| FB | Feedback input | Monitors output via resistor divider; regulates VOUT to 0.765V × (1 + R1/R2); bias current <1 µA minimizes divider error. |
| SHDN | Logic-level enable/disable | Pull ≥2.3V to enable; ≤0.9V to disable; supports RC soft-start by modulating current limit during startup. |
| VIN | Main power input | Accepts 4.5–42V; requires local 2.2–10 µF low-ESR ceramic bypass cap placed adjacent to pin. |
| SW | Switch node output | Drives external inductor and Schottky diode; connects to CBOOT and L1; voltage swings from GND to VIN. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated control loop | Eliminates need for external compensation components - reduces BOM count and layout sensitivity. |
| Short-circuit protected | Current-limit protection engages at 525 mA - prevents damage during output fault without requiring external current-sense circuitry. |
| Soft-start via SHDN pin | RC network on SHDN pin tailors startup dV/dt - suppresses inrush current and avoids output overshoot in sensitive loads. |
| Low-profile SOT-23-6 package | 1.0 mm max height - enables integration into ultra-thin handheld instruments and stacked PCB assemblies. |
| WEBENCH® Power Designer enabled | Fully supported in TI's online design tool - provides validated component selection, efficiency simulation, and thermal analysis. |
Applications
| Industrial Power Meters | Portable Hand-Held Instruments |
|---|---|
Use Scenario: Metering modules powered from 24V DC distribution bus with strict size constraints and battery backup. IC Role / Device Role / Timing Role: Primary point-of-load regulator converting 24V to 3.3V for MCU, ADC, and RF transceiver. Use Value: 85% typical efficiency at 200 mA load reduces thermal load in sealed enclosures; 1.25 MHz switching avoids audible noise. | Use Scenario: Battery-powered multimeter with dual-rail analog front-end requiring stable 1.2V and 3.3V supplies. IC Role / Device Role / Timing Role: Single-chip buck converter delivering regulated 1.2V core voltage and 3.3V I/O rail from single Li-ion cell (3.0–4.2V) with boost pre-regulator. Use Value: 16 µA shutdown current extends shelf life; 0.765V FB reference enables precise low-voltage output without trimming. |
| Battery-Powered Equipment | Industrial Distributed Power |
Use Scenario: Remote sensor node operating from 3.6V primary lithium battery with 10-year field life requirement. IC Role / Device Role / Timing Role: Efficient step-down regulator supplying 1.8V to ultra-low-power microcontroller and 3.3V to wireless transceiver. Use Value: High light-load efficiency (>80% at 10 mA) preserves battery capacity; thermal shutdown prevents failure during intermittent high-current transmission bursts. | Use Scenario: DIN-rail mounted PLC module receiving 24V or 48V DC input with multiple isolated sub-systems. IC Role / Device Role / Timing Role: Non-isolated local regulator generating 5V for logic and 12V for analog signal conditioning from common 24V rail. Use Value: Wide 4.5–42V input range accommodates brownout and surge conditions; 87% max duty cycle supports 24V→12V conversion without dropout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMR14003XMK/NOPB | 40V max input, same 0.3A rating and SOT-23-6 package but lower 0.765V FB reference and 1.25 MHz frequency. | Identical functional scope; differs only in absolute maximum VIN rating (40V vs 42V) and minor thermal specs. | Select when 40V input ceiling is sufficient and cost optimization is prioritized over marginal 2V headroom. |
| TPS62130ARGTR | 6V max input, 3A output, 2.5MHz switching, QFN-16 package - higher performance but incompatible voltage range and footprint. | Not suitable for 24V/36V input systems; intended for low-input, high-current applications like FPGA core rails. | Choose only if system operates below 6V and requires >0.3A output; not a drop-in replacement for LMR14203XMKE/NOPB. |
Compared with LMR14203XMKE/NOPB, LMR14003XMK/NOPB offers identical functionality with slightly reduced input voltage margin, while TPS62130ARGTR targets fundamentally different input voltage and current requirements - making LMR14003XMK/NOPB the only viable alternative for 4.5–42V, 0.3A applications in SOT-23-6.
Availability
LMR14203XMKE/NOPB is available at Aetrix Electronics and suitable for industrial power meters, portable hand-held instruments, battery-powered equipment, industrial distributed power systems, and power metering applications requiring stable component supply across extended product lifecycles.
Supply support for LMR14203XMKE/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 DC/DC conversion solutions.
The LMR14203XMKE/NOPB belongs to TI's SIMPLE SWITCHER® family - engineered for ease-of-use, minimal external component count, and robust operation in industrial and instrumentation environments where input voltage variation and space constraints dominate design priorities.
FAQ
What is the maximum input voltage rating for the LMR14203XMKE/NOPB?
The LMR14203XMKE/NOPB has an absolute maximum input voltage rating of +45V, with normal operating range specified from 4.5V to 42V. Operation above 42V risks exceeding safe operating area limits and may trigger internal protection circuits. The 42V upper limit ensures reliable performance across automotive, industrial, and telecom power rails without derating.
Does the LMR14203XMKE/NOPB require external compensation components?
No, the LMR14203XMKE/NOPB features an internally compensated control loop. This eliminates the need for external compensation capacitors or resistors, simplifying design, reducing bill-of-materials count, and improving layout robustness - especially critical in high-density portable and industrial applications where board space is constrained.
How is soft-start implemented on the LMR14203XMKE/NOPB?
Soft-start on the LMR14203XMKE/NOPB is implemented using the SHDN pin with an external RC network. Applying a ramped voltage to SHDN modulates the cycle-by-cycle current limit from zero up to 525 mA, controlling output voltage rise time and suppressing inrush current. A typical implementation uses a 100 kΩ resistor and 10 nF capacitor tied to VIN and SHDN.
What is the purpose of the CB pin on the LMR14203XMKE/NOPB?
The CB (Charge Boot) pin on the LMR14203XMKE/NOPB provides gate drive voltage for the internal high-side N-channel MOSFET. It must be connected to a 0.15 µF or larger ceramic capacitor between CB and SW to generate the required ~7V bootstrap voltage above SW potential. Failure to properly configure CBOOT results in insufficient gate drive and increased RDSON losses.
Can the LMR14203XMKE/NOPB operate with an output voltage lower than 0.765V?
No - the LMR14203XMKE/NOPB's feedback reference is fixed at 0.765V, and the minimum regulated output voltage equals this reference (achieved when R2 = 0 and R1 omitted). Output voltages below 0.765V are not supported; for sub-0.765V regulation, a different regulator with adjustable reference or external error amplifier is required.
LMR14203XMKE/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- 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):
- 42V
- Voltage - Output (Min/Fixed):
- 0.765V
- Voltage - Output (Max):
- 34V
- Current - Output:
- 300mA
- Frequency - Switching:
- 1.25MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
LMR14203XMKE/NOPB FAQ
1.How can I place an order for LMR14203XMKE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR14203XMKE/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 LMR14203XMKE/NOPB reliable?
The price and inventory of LMR14203XMKE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR14203XMKE/NOPB is usually 5 days.
3.What payment methods are accepted for LMR14203XMKE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR14203XMKE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR14203XMKE/NOPB?
LMR14203XMKE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR14203XMKE/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 LMR14203XMKE/NOPB?
For technical support, including LMR14203XMKE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR14203XMKE/NOPB requirements.
6.How does Aetrix verify that LMR14203XMKE/NOPB is sourced from the original manufacturer or authorized distributors?
All LMR14203XMKE/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 LMR14203XMKE/NOPB meets industry standards.
7.What is the process for return or replacement of LMR14203XMKE/NOPB?
All LMR14203XMKE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMR14203XMKE/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 LMR14203XMKE/NOPB part is unused and in its original packaging.
Return procedure for LMR14203XMKE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMR14203XMKE/NOPB Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
