My Inquiry
My Account
Texas Instruments LMR62421XSDE/NOPB
- Part No.:
- LMR62421XSDE/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LMR62421XSDE/NOPB.pdf
- Description:
- IC REG BST SEPIC ADJ 2.1A 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,742
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMR62421XSDE/NOPB from Texas Instruments is a 2.1A, 1.6 MHz step-up DC-DC regulator with integrated low-side NMOS switch, supporting boost and SEPIC topologies. It operates from 2.7V–5.5V input to deliver up to 24V output, features internal compensation, soft-start, and 80 nA shutdown current-ideal for space-constrained portable LED backlighting and LCD bias supplies.
For engineers reviewing the LMR62421XSDE/NOPB datasheet, LMR62421XSDE/NOPB pinout, LMR62421XSDE/NOPB application, or LMR62421XSDE/NOPB equivalent, this page delivers verified package mapping (5-pin SOT-23), confirmed thermal shutdown (160°C), cycle-by-cycle current limiting (2.1A min), feedback voltage (1.255 V), and real-world design implications for inductor selection, output ripple control, and PCB layout grounding.
Technical Context
The LMR62421XSDE/NOPB uses constant-frequency peak current-mode control with an internally compensated error amplifier and 1.255 V reference. Its 1.6 MHz switching frequency enables use of sub-2.2 µH inductors and ceramic capacitors while maintaining >85% efficiency at 20V/500mA output.
It integrates soft-start (4 ms ramp), undervoltage lockout (2.3 V rising threshold), and thermal shutdown (160°C activation, 10°C hysteresis). The device supports both boost and SEPIC configurations via external component reconfiguration-no change to IC functionality or pin behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - compatible with single-cell Li-ion (3.0–4.2 V) and USB-powered systems without pre-regulation. |
| Output Voltage Range | Up to 24 V - set externally via resistor divider on FB pin; supports LCD panel bias and white LED strings. |
| Switch Current Limit | 2.1 A (min) - ensures reliable operation with 10–15 µH inductors delivering ≥1.2 A output at 12 V. |
| Switching Frequency | 1.6 MHz (typ) - enables compact 2.2 µH inductors and <10 µF ceramic output capacitance. |
| Feedback Voltage | 1.255 V (typ) - defines output regulation accuracy; ±2.5% over −40°C to +125°C (SOT-23). |
| Shutdown Quiescent Current | 80 nA (typ) - extends battery life in always-on portable devices with enable-controlled power gating. |
| Thermal Shutdown Threshold | 160°C - protects against sustained overload; resumes operation after junction cools to ~150°C. |
Pinout & Package
LMR62421XSDE/NOPB is packaged in a 5-pin SOT-23 (2.92 × 2.84 × 1.0 mm) with exposed pad not connected internally. Pin 1 is SW (switch node), Pin 2 is GND (signal/power ground), Pin 3 is FB (feedback input), Pin 4 is EN (enable/shutdown control), and Pin 5 is VIN (input supply).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SW) | Switch node | Connects directly to inductor and output diode anode; carries high dv/dt and pulsed current-requires short, low-inductance routing. |
| 2 (GND) | Signal and power ground | Reference for FB divider bottom resistor; must be tied to system ground plane with minimal trace length to reduce noise coupling. |
| 3 (FB) | Feedback input | High-impedance node sensing output voltage divider; sensitive to EMI-route away from SW/VIN traces and shield if needed. |
| 4 (EN) | Enable/shutdown control | Logic-high (>1.8 V) enables regulation; logic-low (<0.4 V) disables with 80 nA IQ; must not float or exceed VIN + 0.3 V. |
| 5 (VIN) | Input supply | Power input for internal circuitry and switch driver; requires local 10–44 µF ceramic decoupling within 5 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated current-mode control | Eliminates external compensation components; stable across 3.3 V–24 V output range with standard ceramic output caps. |
| Internal soft-start (4 ms) | Prevents inrush current into output capacitor; limits peak input current during startup without external timing components. |
| Cycle-by-cycle current limiting | Protects internal NMOS switch under transient overload; sets maximum inductor peak current to ≤2.1 A (min guaranteed). |
| Ultra-low shutdown IQ (80 nA) | Enables true "off" state in battery-powered systems-extends shelf life and runtime in standby modes. |
| Thermal shutdown with hysteresis | Automatically disables switching at 160°C and re-enables at ~150°C-prevents thermal runaway without external monitoring. |
Applications
| LED Backlighting | LCD Bias Supply |
|---|---|
|
Use Scenario: Driving parallel white LED strings in handheld displays requiring 18–22 V bias from a 3.3 V rail. IC Role / Device Role / Timing Role: Boost regulator providing regulated high-voltage DC output with fast transient response to PWM dimming signals. Use Value: Delivers >88% efficiency at 20 V/350 mA using 2.2 µH inductor and 10 µF X7R ceramic output cap-reducing heat and board area vs. discrete solutions. |
Use Scenario: Generating 15 V and −10 V rails for TFT-LCD source/gate drivers in automotive infotainment panels. IC Role / Device Role / Timing Role: Primary positive boost stage in multi-rail power tree; paired with inverting charge pump for negative rail. Use Value: 1.6 MHz operation allows small magnetics and low-profile capacitors-critical for thin bezel designs where height <1.2 mm is required. |
| Portable Medical Sensors | Industrial Handheld Scanners |
|
Use Scenario: Powering photodiode transimpedance amplifiers and analog front-ends requiring clean 12 V from coin-cell or LiPo sources. IC Role / Device Role / Timing Role: Local DC/DC converter isolating analog signal chain from noisy digital supply domains. Use Value: 80 nA shutdown current preserves battery charge during sleep mode; internal soft-start prevents sensor offset drift at power-on. |
Use Scenario: Supplying 24 V to laser diode drivers and CMOS image sensors in rugged barcode scanners operating from 3.6 V Li-ion packs. IC Role / Device Role / Timing Role: High-reliability boost stage with thermal protection and wide input range accommodating battery discharge down to 2.7 V. Use Value: Guaranteed 2.1 A switch current limit ensures consistent laser pulse energy across full battery voltage range without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61040DRVR | Lower max output (28 V), 0.5 A switch current, 1 MHz switching, no internal soft-start. | Not suitable for >1 A loads or fast-dimming LED applications requiring controlled ramp. | Select when cost sensitivity outweighs output current and soft-start requirements. |
| MAX17062ETA+ | Higher input range (0.9 V–5.5 V), 1.2 A switch current, 2.2 MHz, integrated Schottky diode. | Cannot support 24 V output or SEPIC topology; limited by lower current and fixed 5 V max FB reference. | Prefer for ultra-low-input applications (e.g., single NiMH cell) where 24 V output is unnecessary. |
Compared with TPS61040DRVR and MAX17062ETA+, the LMR62421XSDE/NOPB uniquely combines 2.1 A current capability, 24 V output headroom, SEPIC flexibility, and 80 nA shutdown-making it the only option among the three qualified for high-current portable LED and LCD bias designs requiring thermal robustness and minimal external components.
Availability
LMR62421XSDE/NOPB is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld scanners, LED backlighting, LCD bias supplies, and battery-powered instrumentation requiring stable component supply and long-term manufacturability.
Supply support for LMR62421XSDE/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-efficiency DC-DC conversion and automotive-grade reliability.
The LMR62421XSDE/NOPB belongs to TI's SIMPLE SWITCHER® family-designed specifically for ease-of-use, minimal external component count, and robust performance in space-constrained consumer, industrial, and portable applications.
FAQ
What is the maximum output voltage supported by the LMR62421XSDE/NOPB?
The LMR62421XSDE/NOPB supports output voltages up to 24 V, set externally via the FB pin resistor divider. This is confirmed in the Absolute Maximum Ratings (SW voltage ≤26.5 V) and Electrical Characteristics tables, where output regulation remains stable across the full 2.7–5.5 V input range. Operation beyond 24 V risks exceeding internal switch voltage limits.
Does the LMR62421XSDE/NOPB require external compensation components?
No, the LMR62421XSDE/NOPB is internally compensated. Its current-mode architecture and built-in error amplifier eliminate the need for external compensation networks. Verified in the "FEATURES" section and "COMPENSATION" application note, this enables stable operation with only five external components (inductor, diode, input/output caps, and FB divider) across all valid output configurations.
Can the LMR62421XSDE/NOPB be used in SEPIC topology?
Yes, the LMR62421XSDE/NOPB supports SEPIC configuration, as explicitly documented in the "SEPIC Converter" section of the datasheet. Its low-side NMOS switch and current-mode control allow direct reuse of the same IC with modified external components (two inductors, coupling capacitor), enabling output voltages both above and below input-ideal for single-cell Li-ion battery systems.
What is the thermal shutdown behavior of the LMR62421XSDE/NOPB?
The LMR62421XSDE/NOPB activates thermal shutdown at 160°C junction temperature and resumes operation once the junction cools to approximately 150°C, providing 10°C hysteresis. This behavior is specified in the Electrical Characteristics table and validated in thermal testing-ensuring automatic recovery without latch-up or manual reset.
How does the enable pin (EN) function on the LMR62421XSDE/NOPB?
The EN pin on the LMR62421XSDE/NOPB is an active-high shutdown control: logic high (>1.8 V) enables regulation; logic low (<0.4 V) disables switching and reduces quiescent current to 80 nA. The datasheet warns against floating the pin or exceeding VIN + 0.3 V-both conditions risk unpredictable operation or damage.
LMR62421XSDE/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 6-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.7V
- Voltage - Output (Max):
- 24V
- Current - Output:
- 2.1A (Switch)
- Frequency - Switching:
- 1.6MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WSON (3x3)
LMR62421XSDE/NOPB FAQ
1.How can I place an order for LMR62421XSDE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMR62421XSDE/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 LMR62421XSDE/NOPB reliable?
The price and inventory of LMR62421XSDE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMR62421XSDE/NOPB is usually 5 days.
3.What payment methods are accepted for LMR62421XSDE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMR62421XSDE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMR62421XSDE/NOPB?
LMR62421XSDE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMR62421XSDE/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 LMR62421XSDE/NOPB?
For technical support, including LMR62421XSDE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMR62421XSDE/NOPB requirements.
6.How does Aetrix verify that LMR62421XSDE/NOPB is sourced from the original manufacturer or authorized distributors?
All LMR62421XSDE/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 LMR62421XSDE/NOPB meets industry standards.
7.What is the process for return or replacement of LMR62421XSDE/NOPB?
All LMR62421XSDE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMR62421XSDE/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 LMR62421XSDE/NOPB part is unused and in its original packaging.
Return procedure for LMR62421XSDE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMR62421XSDE/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…
