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Texas Instruments LM2623LD
- Part No.:
- LM2623LD
- Manufacturer:
- Texas Instruments
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LM2623LD.pdf
- Description:
- IC REG BOOST ADJ 2.2A 14WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,938
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Product details
Overview
LM2623LD 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, features a 0.17 Ω internal N-channel MOSFET, and achieves up to 90% efficiency in handheld power management applications.
For engineers reviewing the LM2623LD datasheet, LM2623LD pinout, LM2623LD application, or LM2623LD equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply support details for production deployment in portable electronics.
Technical Context
The LM2623LD implements a pulse-frequency-modulated (PFM) gated-oscillator control scheme with cycle-by-cycle current limiting and thermal shutdown. Its regulation relies on skipping switching cycles when the FB pin reaches 1.24 V, enabling high efficiency across ultra-light to full loads without requiring external compensation.
It integrates an internal 0.17 Ω N-channel MOSFET switch, bootstrap gate drive (BOOT pin), dual ground separation (PGND and SGND), and programmable frequency via external resistor on FREQ pin - supporting 300 kHz to 2 MHz operation while maintaining stable start-up from as low as 1.1 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.8 V to 14 V - enables direct operation from 1–4 alkaline or 1–3 Li-ion cells without pre-regulation. |
| Output Voltage Range | 1.24 V to 14 V - set by external resistive divider on FB pin; 1.24 V reference ensures ±2.2% accuracy over temperature. |
| Switching Frequency | 300 kHz to 2 MHz - selected via resistor on FREQ pin; higher frequencies allow smaller inductors and capacitors. |
| Peak Switch Current Limit | 1.2 A (LM2623 variant) - protects against overload; actual limit varies with temperature and package type. |
| Quiescent Current | 80 µA typical - minimizes battery drain during active operation; drops to <2.5 µA in shutdown mode. |
| Start-up Voltage | 1.1 V - allows reliable boot from nearly depleted single-cell batteries before transitioning to bootstrap-powered operation. |
| MOSFET RDS(on) | 0.17 Ω - reduces conduction loss and improves efficiency at high load currents, especially below 5 V output. |
Pinout & Package
LM2623LD is packaged in an 8-pin VSSOP (DGK) package measuring 3.00 mm × 3.00 mm with 1.09-mm height, optimized for space-constrained portable designs. Thermal performance is characterized by RθJA = 152.5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 2) | Active-low enable input | Pulls below 0.15×VDD to enter shutdown; draws <2.5 µA in shutdown - critical for system-level power sequencing. |
| FREQ (Pin 5) | Frequency programming node | Accepts external resistor to set oscillator frequency; enables dynamic duty-cycle tuning for PFM optimization. |
| FB (Pin 6) | Feedback voltage sense | Monitors output via resistive divider; regulates to precise 1.24 V reference - determines final output accuracy and stability. |
| VDD (Pin 10) | Internal circuit power supply | Must be supplied 3–5 V; can be bootstrapped from output - eliminates need for separate bias rail in many designs. |
| BOOT (Pin 11) | Bootstrap gate drive supply | Provides elevated voltage to drive internal N-MOSFET gate above SW node - essential for high-side switch operation. |
| SW (Pin 12/13) | Switch node | Drain of internal MOSFET; carries high di/dt switching current - requires tight layout to minimize EMI and voltage spikes. |
| PGND (Pins 2 & 3) | Power ground return | Low-impedance path for high-current switch return; must be shorted to SGND at single point near device for noise isolation. |
| SGND (Pin 9) | Signal ground reference | Reference for FB, EN, FREQ, and VDD - separates sensitive analog circuitry from noisy power return paths. |
Key Features
| Feature | Design Value |
|---|---|
| Gated-oscillator PFM control | Delivers >87% efficiency across 10 mA–500 mA loads without external compensation - ideal for variable-load battery systems. |
| Ultra-low start-up voltage | 1.1 V start-up enables operation from weak single-cell sources; sustains regulation down to 0.8 V using bootstrap VDD. |
| Dual-ground architecture | Separate PGND and SGND pins reduce noise coupling between power switching and feedback circuits - improves output ripple & stability. |
| Integrated current limit & thermal protection | 1.2 A peak switch current limit and automatic thermal shutdown at ~160°C prevent damage during fault conditions. |
| Programmable frequency & duty cycle | External R on FREQ pin sets base frequency; optional C adds non-linear duty-cycle adjustment - enables ripple and size optimization. |
Applications
| Camera Power Supply | White LED Backlight Driver |
|---|---|
|
Use Scenario: Boosting single-cell alkaline (1.5 V) or Li-ion (3.0–3.7 V) to 5 V for digital camera flash and sensor logic rails. IC Role / Device Role / Timing Role: Primary step-up regulator providing stable 5 V rail with fast transient response to burst-mode flash demands. Use Value: 90% peak efficiency and 80 µA quiescent current extend battery life; 1.1 V start-up ensures functionality even with aging batteries. |
Use Scenario: Driving parallel white LEDs in PDAs or GPS devices requiring constant-current source with 3.3–5 V output. IC Role / Device Role / Timing Role: Constant-voltage boost stage feeding external LED driver IC or resistor-limited strings. Use Value: Adjustable output (1.24–14 V) accommodates varying LED forward voltages; low output ripple (<20 mVpp) prevents visible flicker. |
| Flash Memory Programming | Hand-Held Instrument Power |
|
Use Scenario: Generating 12 V from 3.3 V system rail to program NAND/NOR flash memory in portable test equipment. IC Role / Device Role / Timing Role: High-voltage boost converter operating in PFM mode to minimize standby power during idle periods. Use Value: 14 V max output meets flash VPP requirements; shutdown current <2.5 µA preserves battery during long storage intervals. |
Use Scenario: Powering mixed-signal circuits (ADC, microcontroller, display) in battery-operated multimeters or data loggers. IC Role / Device Role / Timing Role: Main system power regulator delivering clean, regulated 3.3 V or 5 V from 2-cell alkaline input. Use Value: Dual-ground isolation (PGND/SGND) suppresses switching noise in precision analog sections; small VSSOP footprint saves PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2622 | Higher peak current limit (2.85 A), same 8-pin VSSOP package, but requires external MOSFET - increases BOM count and layout complexity. | Better suited for higher-output-current (>1.5 A) or higher-VOUT (>12 V) applications where internal switch limits of LM2623LD are exceeded. | Select LM2622 only if load current exceeds 1.2 A or if adjustable current limit is required; otherwise LM2623LD offers lower component count and cost. |
| LM2733 | Fixed 5 V output, 2.2 MHz switching frequency, integrated Schottky diode, 0.65 Ω RDS(on) - trades efficiency for simplicity and smaller solution size. | Ideal for fixed 5 V rail generation where board space is critical and efficiency above 80% is acceptable at light loads. | Choose LM2733 for compact, fixed-output designs; LM2623LD remains preferred when adjustable output, higher efficiency, or wider input range is needed. |
Compared with LM2622 and LM2733, the LM2623LD uniquely balances adjustable output, integrated switch, ultra-low start-up voltage, and PFM efficiency across wide load ranges - making it optimal for multi-cell portable systems requiring flexibility and battery longevity.
Availability
LM2623LD is available at Aetrix Electronics and suitable for camera power supplies, white LED backlight drivers, flash memory programming circuits, hand-held instrument power rails, and 1–4 cell alkaline/Li-ion systems requiring stable component supply and long-term lifecycle support.
Supply support for LM2623LD 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 battery-efficient power conversion ICs.
The LM2623LD belongs to TI's general-purpose boost converter product line, engineered specifically for low-input-voltage, high-efficiency portable power applications where small size, low quiescent current, and wide operating range are critical.
FAQ
What is the minimum input voltage required to start up the LM2623LD?
The LM2623LD starts up from as low as 1.1 V at room temperature, enabling operation from nearly depleted single-cell batteries. Once started, it sustains regulation down to 0.8 V input by bootstrapping VDD from the output. This behavior is confirmed in the Electrical Characteristics table under VDD_ST parameter and applies directly to the LM2623LD variant.
Does the LM2623LD include an integrated power switch?
Yes, the LM2623LD integrates a 0.17 Ω N-channel MOSFET power switch rated for up to 1.2 A peak current. This eliminates the need for an external transistor and simplifies the bill of materials. The RDS(on) value is specified in the Electrical Characteristics section and is measured across the SW and PGND terminals.
How is the output voltage set on the LM2623LD?
The LM2623LD uses a resistive feedback divider connected to the FB pin to set output voltage. With a precise 1.24 V internal reference, the formula RF1 = RF2 × ((VOUT/1.24) − 1) determines resistor values. Typical designs use RF2 = 100 kΩ and calculate RF1 accordingly - a method validated in the "Setting The Output Voltage" section of the datasheet.
Can the LM2623LD operate in shutdown mode with ultra-low current draw?
Yes, the LM2623LD draws less than 2.5 µA in shutdown mode when the EN pin is pulled below 0.15×VDD. This guaranteed maximum is specified over −40°C to +85°C and is critical for extending battery life in always-on portable devices. The shutdown state disables all internal regulators and the power switch.
What package options are available for the LM2623LD?
The LM2623LD is offered exclusively in the 8-pin VSSOP (DGK) package, measuring 3.00 mm × 3.00 mm with 1.09-mm height. While the LM2623 family also includes a 14-pin WSON option (NHE), the "LD" suffix specifically denotes the VSSOP variant - confirmed in TI's orderable addendum and device information tables.
LM2623LD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for LM2623LD through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2623LD 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 reliable?
The price and inventory of LM2623LD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2623LD is usually 5 days.
3.What payment methods are accepted for LM2623LD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2623LD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2623LD?
LM2623LD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2623LD 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?
For technical support, including LM2623LD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2623LD requirements.
6.How does Aetrix verify that LM2623LD is sourced from the original manufacturer or authorized distributors?
All LM2623LD 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 meets industry standards.
7.What is the process for return or replacement of LM2623LD?
All LM2623LD units undergo pre-shipment inspection (PSI). If there is an issue with LM2623LD, 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 part is unused and in its original packaging.
Return procedure for LM2623LD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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