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Texas Instruments LM2623ALD
- Part No.:
- LM2623ALD
- Manufacturer:
- Texas Instruments
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LM2623ALD.pdf
- Description:
- IC REG BOOST ADJ 2.2A 14WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,118
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Product details
Overview
LM2623ALD from Texas Instruments is a gated-oscillator-based DC-DC boost converter IC designed for battery-powered systems requiring low-input-voltage start-up and high-efficiency voltage step-up. It operates from 0.8 V to 14 V input, delivers adjustable output from 1.24 V to 14 V, supports up to 2 MHz switching frequency, integrates a 0.17 Ω N-channel MOSFET, and delivers up to 2 A load current at low output voltages - ideal for powering white LEDs and TFT LCDs in portable electronics.
For engineers reviewing the LM2623ALD datasheet, LM2623ALD pinout, LM2623ALD application, or LM2623ALD equivalent, key selection considerations include its 1.1 V start-up voltage, programmable frequency via external resistor, PFM regulation mode, thermal shutdown protection, and compatibility with 2-cell alkaline or lithium-ion battery inputs.
Technical Context
The LM2623ALD implements a gated-oscillator control scheme using pulse frequency modulation (PFM), enabling high efficiency across ultra-wide load ranges by skipping switching cycles when regulation is met. Its internal oscillator frequency (300 kHz–2 MHz) and duty cycle (17%–90%) are externally programmable via resistor on FREQ pin and capacitor on C3 node.
It features an integrated 0.17 Ω N-channel power MOSFET switch, cycle-by-cycle current limiting (2.85 A typical), thermal shutdown (~160°C), and dual ground separation (PGND and SGND) to minimize noise coupling. The device starts from 1.1 V and sustains operation down to 0.8 V via bootstrap-powered VDD derived from output voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.8 V to 14 V - enables direct operation from single- or multi-cell alkaline/lithium batteries without pre-regulation. |
| Start-up Voltage | 1.1 V - allows reliable boot from deeply discharged 2-cell alkaline or 1-cell Li-ion sources. |
| Output Voltage Range | 1.24 V to 14 V - adjustable via external resistive divider on FB pin, supporting LED bias, logic rails, and display supplies. |
| Switching Frequency | 300 kHz to 2 MHz - set by external resistor on FREQ pin; higher frequencies enable smaller magnetics and compact PCB layout. |
| Peak Switch Current Limit | 2.85 A (typical) - protects internal MOSFET during overload or short-circuit conditions without external sensing. |
| MOSFET RDS(on) | 0.17 Ω - reduces conduction loss and improves efficiency at high load currents, especially below 5 V output. |
| Quiescent Current | 80 µA (typical) - minimizes standby power draw in always-on portable devices like GPS units and pagers. |
| Shutdown Current | < 2.5 µA - extends battery life during system sleep modes without requiring external disconnect circuitry. |
Pinout & Package
LM2623ALD 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 strict separation of power and signal grounds.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 2) | Active-low enable input | Drives device into <2.5 µA shutdown when pulled below 0.15×VDD; enables normal operation above 0.7×VDD. |
| FREQ (Pin 5) | Frequency programming node | Accepts external resistor to set oscillator frequency between 300 kHz and 2 MHz; determines inductor size and EMI profile. |
| FB (Pin 6) | Feedback reference input | Monitors output voltage via resistive divider; regulates output to 1.24 V reference with ±3% accuracy over temperature. |
| VDD (Pin 10) | Internal circuit supply rail | Must be biased 3–5 V; typically bootstrapped from output to sustain operation below 0.8 V input. |
| BOOT (Pin 11) | Bootstrap gate drive supply | Provides elevated voltage to drive internal N-MOSFET gate; requires external 100 pF ceramic capacitor to SW and BOOT pins. |
| SW (Pins 12 & 13) | Switch node | Drain of internal N-MOSFET; connects to inductor and Schottky diode anode; handles high dv/dt and peak currents up to 2.85 A. |
| PGND (Pins 2 & 3) | Power ground return | Low-impedance path for high-current switching loop; must be shorted together and connected directly to input/output capacitors. |
| SGND (Pin 9) | Signal ground reference | Reference for FB, EN, FREQ, and VDD circuits; isolated from PGND to prevent noise injection into feedback path. |
Key Features
| Feature | Design Value |
|---|---|
| Gated-oscillator PFM control | Delivers >87% efficiency across 10 µA–2 A load range without external compensation components. |
| Programmable switching frequency | Resistor-adjustable 300 kHz–2 MHz operation enables optimization of inductor size, efficiency, and EMI compliance. |
| Dual-ground architecture | Separate PGND and SGND pins reduce noise coupling between high-current switching paths and sensitive analog feedback. |
| Integrated thermal shutdown | Disables MOSFET at ~160°C junction temperature and auto-recovers at ~135°C - prevents permanent damage under sustained overload. |
| Low-voltage bootstrap operation | VDD powered from regulated output allows continuous regulation even as input drops below 0.8 V after startup. |
| Current-limited internal MOSFET | 0.17 Ω RDS(on) with 2.85 A peak limit eliminates need for external current-sense resistor or protection circuitry. |
Applications
| White LED Backlighting | TFT LCD Power Supply |
|---|---|
|
Use Scenario: Driving parallel strings of white LEDs in handheld GPS devices or digital cameras with 2-cell alkaline input. IC Role / Device Role / Timing Role: Step-up regulator providing constant-current LED bias via external current-sense resistor and feedback configuration. Use Value: 1.1 V start-up ensures backlight operation even with partially depleted batteries; 2 MHz capability allows use of 1 µH inductors for minimal board area. |
Use Scenario: Generating 5 V or 12 V rail for TFT LCD panel bias in palmtop computers and industrial HMIs. IC Role / Device Role / Timing Role: Primary DC-DC boost converter supplying stable, low-ripple output to display driver ICs and gate drivers. Use Value: Dual-ground isolation (PGND/SGND) suppresses switching noise on analog display signals; 87% efficiency at 500 mA extends runtime in battery-only operation. |
| Flash Memory Programming | Hand-Held Instrumentation |
|
Use Scenario: Providing 12 V programming voltage for NAND/NOR flash in portable data loggers or firmware-upgrade tools. IC Role / Device Role / Timing Role: High-voltage boost stage delivering regulated 12 V output from 3.3 V system rail or 2-cell input. Use Value: Adjustable output up to 14 V supports wide range of flash technologies; thermal shutdown prevents overheating during extended write cycles. |
Use Scenario: Powering mixed-signal circuits (ADCs, op-amps, microcontrollers) in portable multimeters or environmental sensors. IC Role / Device Role / Timing Role: Primary power conversion IC generating clean, stable supply rails from primary battery source. Use Value: 80 µA quiescent current preserves battery life during measurement standby; PFM mode maintains regulation stability across varying sensor load profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2622MM | Same gated-oscillator architecture but rated for 1.2 A peak switch current and 0.35 Ω RDS(on); no WSON option. | Better suited for lower-current, cost-sensitive applications where 2 A capability is unnecessary. | Select LM2622MM when load current remains ≤1.2 A and thermal budget permits higher conduction loss. |
| LM2733YMF | Fixed-frequency PWM controller (1.6 MHz), 0.25 Ω RDS(on), 1.6 A current limit; requires external compensation. | Offers tighter output voltage regulation and lower ripple than PFM-based LM2623ALD, but higher light-load quiescent current (100 µA). | Choose LM2733YMF when consistent switching frequency and low output ripple are prioritized over ultra-low standby power. |
Compared with LM2622MM and LM2733YMF, the LM2623ALD uniquely balances ultra-low start-up voltage (1.1 V), high peak current (2.85 A), and sub-µA shutdown - making it optimal for deeply discharged battery systems demanding both high efficiency and robust fault protection.
Availability
LM2623ALD is available at Aetrix Electronics and suitable for white LED backlighting, TFT LCD power supplies, flash memory programming, and hand-held instrumentation requiring stable component supply and long-term manufacturability.
Supply support for LM2623ALD 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 solutions, with leadership in power management ICs for portable and industrial applications.
The LM2623 product line delivers high-efficiency, low-voltage boost conversion for battery-powered consumer electronics - engineered to maximize runtime, minimize board space, and simplify design through integrated MOSFETs and adaptive PFM control.
FAQ
What is the minimum input voltage required for LM2623ALD to start up?
The LM2623ALD starts up from a minimum input voltage of 1.1 V at 25°C. This low start-up threshold enables reliable operation from nearly depleted 2-cell alkaline or 1-cell lithium-ion batteries. Once started, the device sustains regulation down to 0.8 V input by bootstrapping VDD from the output rail, ensuring uninterrupted power delivery during battery discharge.
How is the switching frequency set on the LM2623ALD?
The LM2623ALD switching frequency is programmed using an external resistor connected between VIN and the FREQ pin (Pin 5). A resistor value of 300 kΩ sets approximately 300 kHz, while 100 kΩ yields ~1 MHz - per TI's Figure 3 in the datasheet. The frequency range spans 300 kHz to 2 MHz, allowing trade-offs between inductor size, efficiency, and EMI performance.
Does the LM2623ALD require an external MOSFET?
No, the LM2623ALD integrates a 0.17 Ω N-channel power MOSFET switch, eliminating the need for external switching transistors. This integration reduces BOM count, simplifies layout, and improves reliability. The internal MOSFET supports up to 2.85 A peak current and includes cycle-by-cycle current limiting and thermal shutdown protection.
What is the purpose of separate PGND and SGND pins on the LM2623ALD?
The LM2623ALD uses separate PGND (Pins 2 & 3) and SGND (Pin 9) to isolate high-current switching return paths from sensitive analog reference circuits. PGND carries pulsed inductor current and diode return current, while SGND serves as the quiet reference for FB, EN, FREQ, and VDD. This separation minimizes noise coupling and improves regulation accuracy and stability.
Can the LM2623ALD regulate output voltage below 1.24 V?
No, the LM2623ALD has a fixed internal reference voltage of 1.24 V at the FB pin, and its output voltage is set by the equation VOUT = 1.24 V × (1 + RF1/RF2). Therefore, the lowest achievable regulated output is 1.24 V. Output voltages below this threshold cannot be achieved using standard feedback configuration and require external regulation or alternative topology.
LM2623ALD 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)
LM2623ALD FAQ
1.How can I place an order for LM2623ALD through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2623ALD 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 LM2623ALD reliable?
The price and inventory of LM2623ALD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2623ALD is usually 5 days.
3.What payment methods are accepted for LM2623ALD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2623ALD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2623ALD?
LM2623ALD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2623ALD 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 LM2623ALD?
For technical support, including LM2623ALD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2623ALD requirements.
6.How does Aetrix verify that LM2623ALD is sourced from the original manufacturer or authorized distributors?
All LM2623ALD 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 LM2623ALD meets industry standards.
7.What is the process for return or replacement of LM2623ALD?
All LM2623ALD units undergo pre-shipment inspection (PSI). If there is an issue with LM2623ALD, 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 LM2623ALD part is unused and in its original packaging.
Return procedure for LM2623ALD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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