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Texas Instruments LM2623LD/NOPB
- Part No.:
- LM2623LD/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LM2623LD/NOPB.pdf
- Description:
- IC REG BOOST ADJ 2.2A 14WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,077
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Product details
Overview
LM2623LD/NOPB from Texas Instruments is a gated-oscillator-based DC-DC boost converter IC designed for low-input-voltage battery systems. It operates from 0.8 V to 14 V input, delivers adjustable output from 1.24 V to 14 V, supports up to 2 A load at low output voltages, integrates a 0.17 Ω N-channel MOSFET switch, and achieves up to 90% efficiency in handheld power management applications.
For engineers reviewing the LM2623LD/NOPB datasheet, LM2623LD/NOPB pinout, LM2623LD/NOPB application, or LM2623LD/NOPB equivalent, key selection criteria include start-up voltage (1.1 V), shutdown current (<2.5 µA), programmable switching frequency (300 kHz–2 MHz), FB reference accuracy (1.24 V ±3%), and thermal performance in the 8-pin VSSOP package.
Technical Context
The LM2623LD/NOPB implements pulse-frequency modulation (PFM) via a gated oscillator architecture that skips switching cycles upon regulation, enabling high efficiency across ultra-light to full loads. Its duty cycle is programmable using external RC components on the FREQ pin, allowing dynamic adaptation to input/output voltage ratios.
It features an internal 0.17 Ω N-channel MOSFET switch, cycle-by-cycle current limiting (1.2 A typical), thermal shutdown (~160°C), and dual ground separation (PGND and SGND) to minimize noise coupling in sensitive feedback paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.8 V to 14 V - supports single- to multi-cell alkaline/Li-ion batteries and maintains regulation below 1 V after startup. |
| Output Voltage Range | 1.24 V to 14 V - set via external resistor divider on FB pin; 1.24 V reference enables precise output programming. |
| Switching Frequency | 300 kHz to 2 MHz - externally programmed via resistor on FREQ pin; higher frequencies enable smaller magnetics and compact layouts. |
| Peak Switch Current Limit | 1.2 A - protects against overload and short-circuit; ensures safe operation without external current-sense circuitry. |
| Start-up Voltage | 1.1 V - enables reliable boot from nearly depleted 2-cell alkaline or 1-cell Li-ion sources. |
| Quiescent Current | 80 µA typical - minimizes standby power loss in always-on portable devices. |
| Shutdown Current | <2.5 µA - extends battery life during system sleep modes with active-low EN control. |
| MOSFET RDS(on) | 0.17 Ω - reduces conduction losses and improves efficiency at moderate load currents. |
Pinout & Package
The LM2623LD/NOPB is housed in an 8-pin VSSOP package (3.00 mm × 3.00 mm, 1.09-mm height), optimized for space-constrained portable designs. Thermal performance is enhanced by exposed PGND pads and tight layout requirements for SW, BOOT, and PGND nodes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PGND) | Power Ground | Primary return path for high-current switch node; must be low-inductance and tied directly to PCB ground plane. |
| 2 (EN) | Enable Input | Active-low logic control; pulls below 0.15×VDD to enter shutdown mode with <2.5 µA supply current. |
| 3 (FREQ) | Frequency Adjustment | Analog input for external resistor; sets oscillator frequency from 300 kHz to 2 MHz to optimize size/efficiency trade-offs. |
| 4 (FB) | Voltage Feedback | Monitors output via resistive divider; 1.24 V reference enables accurate output regulation across temperature. |
| 5 (SGND) | Signal Ground | Reference for FB, EN, and FREQ pins; isolated from PGND to prevent noise injection into feedback path. |
| 6 (VDD) | Internal Supply | 3–5 V bias rail; can be bootstrapped from output to sustain operation below 0.8 V input after startup. |
| 7 (BOOT) | Bootstrap Supply | Drives gate of internal N-MOSFET; requires external capacitor between BOOT and SW to maintain high-side drive. |
| 8 (SW) | Switch Node | Drain of internal power MOSFET; connects to inductor and Schottky diode anode; handles high dv/dt and peak currents. |
Key Features
| Feature | Design Value |
|---|---|
| Gated Oscillator PFM Control | Skips switching cycles instead of modulating pulse width - delivers >87% efficiency from 1 mA to 500 mA load without external compensation. |
| Low-Voltage Start-up | Operates from 1.1 V input - enables use in deeply discharged 2-cell alkaline or 1-cell Li-ion systems before regulation begins. |
| Dual Ground Separation | Independent PGND (pins 1, 3) and SGND (pin 5) - isolates high-current return paths from precision analog references to reduce noise-induced regulation error. |
| Integrated Power Switch | 0.17 Ω N-channel MOSFET - eliminates external switch, reduces BOM count, and simplifies layout while maintaining thermal safety margin. |
| Programmable Frequency & Duty Cycle | FREQ pin + external R/C allows tuning of both switching frequency and adaptive duty cycle - optimizes efficiency across varying input/output conditions. |
| Thermal & Current Protection | Auto-shutdown at ~160°C junction temperature and cycle-by-cycle current limit - prevents damage under overload or poor heatsinking. |
Applications
| Camera Flash Power Supply | White LED Backlight Driver |
|---|---|
Use Scenario: Boosts 2-cell alkaline (2.4 V nominal) to 5 V for xenon flash capacitor charging in compact digital cameras. IC Role / Device Role / Timing Role: Primary step-up regulator with gated-oscillator PFM control; manages burst-mode energy delivery without audible noise. Use Value: 1.1 V start-up enables flash operation even with weak batteries; 90% efficiency extends usable shot count per battery set. |
Use Scenario: Powers parallel white LEDs (3.2–3.6 V forward) from single Li-ion cell (3.0–4.2 V) in smartphone displays. IC Role / Device Role / Timing Role: Adjustable-output boost controller; FB pin sets constant current via LED string resistor or external current sense. Use Value: Programmable frequency avoids AM radio band interference; low quiescent current preserves standby battery life. |
| TFT LCD Bias Supply | Handheld Instrument Power Rail |
Use Scenario: Generates +12 V and –5 V rails (using charge-pump assist) from 3.3 V system supply for TFT panel gate drivers. IC Role / Device Role / Timing Role: High-voltage boost stage; FREQ pin tuned to 1 MHz for minimal EMI and small 2.2 µH inductor footprint. Use Value: 14 V max output supports wide TFT VGH range; thermal protection prevents latch-up during display initialization surges. |
Use Scenario: Provides stable 5 V rail from 2-cell NiMH (1.8–3.0 V) for microcontroller, sensor, and RF transceiver in portable test equipment. IC Role / Device Role / Timing Role: Main system power converter; EN pin synchronized to MCU sleep/wake signals for zero-power standby. Use Value: <2.5 µA shutdown current enables multi-week battery shelf life; 0.17 Ω RDS(on) sustains 2 A peak for RF transmit bursts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2622MM/NOPB | Higher 2.85 A current limit; same 8-pin VSSOP package; identical pinout and FB reference. | Better suited for 3.3 V → 5 V/1 A applications requiring higher peak current headroom. | Select LM2622MM/NOPB when load transients exceed 1.2 A or when operating near thermal limits with large inductors. |
| LM2731YMF/NOPB | Fixed 1.6 MHz switching frequency; 0.65 Ω RDS(on); lower 0.65 V minimum input; no FREQ pin. | Optimized for ultra-small solutions (0402 inductors); less flexible but simpler layout for fixed 5 V output. | Choose LM2731YMF/NOPB for cost-sensitive, space-constrained designs where programmability is unnecessary and 5 V output suffices. |
Compared with LM2623LD/NOPB, LM2622MM/NOPB offers higher current capability at identical footprint and control interface, while LM2731YMF/NOPB trades programmability for smaller solution size and lower minimum input voltage - making each suitable for distinct trade-offs in efficiency, size, and transient robustness.
Availability
LM2623LD/NOPB is available at Aetrix Electronics and suitable for camera flash power supplies, white LED backlight drivers, TFT LCD bias generation, and handheld instrument power rails requiring stable component supply, long-lifecycle support, and TI-qualified production-grade reliability.
Supply support for LM2623LD/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 delivering analog, embedded processing, and connectivity technologies for industrial, automotive, and personal electronics markets.
The LM2623 belongs to TI's general-purpose DC-DC boost converter product line, engineered specifically for ultra-low-input-voltage battery-powered systems where start-up voltage, quiescent current, and layout simplicity are critical design constraints.
FAQ
What is the minimum input voltage required for LM2623LD/NOPB to start up?
The LM2623LD/NOPB starts up from as low as 1.1 V at 25°C, enabling operation from nearly depleted 2-cell alkaline or 1-cell Li-ion batteries. Once regulation is established, it continues operating down to 0.8 V input due to bootstrapped VDD supply from the output rail.
How does the LM2623LD/NOPB achieve high efficiency across wide load ranges?
The LM2623LD/NOPB uses gated-oscillator PFM control that skips switching cycles under light loads instead of reducing duty cycle. This preserves high gate-drive efficiency and minimizes switching losses, delivering >87% efficiency from 10 mA to 500 mA without external compensation components.
Can the LM2623LD/NOPB be used with a single Li-ion cell?
Yes - the LM2623LD/NOPB accepts input from 0.8 V to 14 V and starts from 1.1 V, making it fully compatible with single Li-ion cells (2.7–4.2 V operational range). Its 1.24 V FB reference and adjustable output allow precise 3.3 V or 5 V generation with standard resistor dividers.
What is the purpose of separate PGND and SGND pins on the LM2623LD/NOPB?
PGND (pins 1 and 3) carries high pulsed switch current, while SGND (pin 5) serves as the quiet reference for FB, EN, and FREQ analog circuits. Separating these grounds prevents noise coupling into the feedback path, ensuring stable regulation and reduced output voltage ripple.
Is the LM2623LD/NOPB pin-compatible with other members of the LM262x family?
The LM2623LD/NOPB shares the same 8-pin VSSOP (DGK) package and pinout with LM2622MM/NOPB, including identical EN, FB, FREQ, VDD, BOOT, SW, PGND, and SGND assignments - enabling direct substitution where current limit and thermal requirements align.
LM2623LD/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.8V
- Voltage - Input (Max):
- 14V
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 14V
- Current - Output:
- 2.2A (Switch)
- Frequency - Switching:
- 300kHz ~ 2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-WSON (4x4)
LM2623LD/NOPB FAQ
1.How can I place an order for LM2623LD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2623LD/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 LM2623LD/NOPB reliable?
The price and inventory of LM2623LD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2623LD/NOPB is usually 5 days.
3.What payment methods are accepted for LM2623LD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2623LD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2623LD/NOPB?
LM2623LD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2623LD/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 LM2623LD/NOPB?
For technical support, including LM2623LD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2623LD/NOPB requirements.
6.How does Aetrix verify that LM2623LD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2623LD/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 LM2623LD/NOPB meets industry standards.
7.What is the process for return or replacement of LM2623LD/NOPB?
All LM2623LD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2623LD/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 LM2623LD/NOPB part is unused and in its original packaging.
Return procedure for LM2623LD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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