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Texas Instruments LM2623LDX
- Part No.:
- LM2623LDX
- Manufacturer:
- Texas Instruments
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LM2623LDX.pdf
- Description:
- IC REG BOOST ADJ 2.2A 14WSON
- Quantity:
- Payment:
- Shipping:
Inventory:4,022
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Product details
Overview
LM2623LDX 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 MHz switching frequency, features a 0.17 Ω internal N-channel MOSFET, and achieves up to 90% efficiency in handheld power management applications.
For engineers reviewing the LM2623LDX datasheet, LM2623LDX pinout, LM2623LDX application, or LM2623LDX equivalent, key selection criteria include its 1.1 V start-up voltage, programmable frequency via external resistor, PFM regulation mode, thermal protection, and compatibility with 2-cell alkaline or lithium-ion sources.
Technical Context
The LM2623LDX implements a gated-oscillator control scheme with pulse frequency modulation (PFM), enabling high efficiency across ultra-light to full loads by skipping switching cycles upon regulation. Its 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 integrates an internal 0.17 Ω N-channel MOSFET switch, peak current limit (1.2 A typical), thermal shutdown (~160°C), and active-low EN pin with 0.15×VDD shutdown threshold. The device uses bootstrapped VDD operation to sustain regulation below 0.8 V after startup.
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 post-regulated rails. |
| Start-up Voltage | 1.1 V - enables reliable cold-start from nearly-dead 2-cell alkaline or 1-cell Li-ion sources. |
| Output Voltage Range | 1.24 V to 14 V - adjustable via external feedback divider; 1.24 V reference ensures ±2.2% accuracy over temperature. |
| Switching Frequency | 300 kHz to 2 MHz - set by external resistor on FREQ pin; higher frequencies enable smaller magnetics and capacitors. |
| Internal MOSFET RDS(on) | 0.17 Ω (typ) - reduces conduction loss at high load currents; supports up to 2 A at low VOUT. |
| Quiescent Current | 80 µA (typ) - minimizes standby drain in always-on portable devices; drops to <2.5 µA in shutdown. |
| Peak Switch Current Limit | 1.2 A (LM2623 variant) - protects against overload and short-circuit; differs from LM2623A (2.2 A). |
| Thermal Shutdown Threshold | ~160°C - disables switch until junction cools to ~135°C; prevents permanent damage during sustained overload. |
Pinout & Package
LM2623LDX is packaged in an 8-pin VSSOP (DGK) package measuring 3.0 mm × 3.0 mm with 1.09-mm height - half the footprint of standard SOIC-8 and optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 2) | Active-low enable input | Pulls below 0.15×VDD to enter <2.5 µA shutdown; must exceed 0.7×VDD for normal operation. |
| FREQ (Pin 5) | Frequency programming node | Resistor-to-VIN sets oscillator frequency (300 kHz–2 MHz); used with C3 for duty-cycle tuning. |
| FB (Pin 6) | Feedback input | Monitors output via resistive divider; regulates to 1.24 V reference; determines final VOUT. |
| VDD (Pin 10) | Internal circuit supply | Must be 3–5 V; typically bootstrapped from VOUT; powers control logic and gate driver. |
| BOOT (Pin 11) | Bootstrap supply for MOSFET gate | Charged via internal diode/capacitor network; enables full enhancement of N-channel switch. |
| SW (Pins 12 & 13) | Switch node | Drain of internal N-MOSFET; connects to inductor and Schottky anode; handles high dV/dt transitions. |
| PGND (Pins 2 & 3) | Power ground | High-current return path for switch and inductor; must be shorted to SGND at single point for noise control. |
| SGND (Pin 9) | Signal ground | Reference for FB, EN, FREQ, and internal analog circuits; isolated from PGND except at star point. |
Key Features
| Feature | Design Value |
|---|---|
| Gated-oscillator PFM control | Delivers >87% efficiency from 10 mA to 500 mA load without requiring external compensation. |
| Programmable switching frequency | 300 kHz–2 MHz via single external resistor - enables optimization of size, EMI, and efficiency trade-offs. |
| Ultra-low start-up voltage | 1.1 V - allows operation from weak or partially discharged batteries where other boosters fail to start. |
| Integrated thermal protection | Auto-shutdown at ~160°C junction temperature - prevents failure under sustained overload or poor PCB cooling. |
| Bootstrapped VDD operation | Enables continuous regulation down to 0.8 V input after startup - extends usable battery life in low-VIN phase. |
| Low quiescent current | 80 µA operating / <2.5 µA shutdown - preserves battery capacity in standby and sleep modes. |
Applications
| Camera Power Supply | White LED Backlight Driver |
|---|---|
Use Scenario: Boosting 2-cell alkaline (2.0–3.2 V) to 5 V for CCD/CMOS sensor bias and flash charging. IC Role / Device Role / Timing Role: Primary step-up regulator supplying stable 5 V rail with fast transient response to burst-mode imaging loads. Use Value: 1.1 V start-up ensures functionality even with depleted batteries; 90% efficiency minimizes heat in compact camera modules. |
Use Scenario: Driving parallel white LEDs (3.0–3.6 V forward) from single Li-ion cell (2.8–4.2 V). IC Role / Device Role / Timing Role: Constant-voltage boost converter regulating LED string voltage; PFM mode maintains efficiency at dimmed (low-current) settings. Use Value: Programmable frequency avoids audible noise in sensitive audio-visual devices; low IQ extends playback time between charges. |
| TFT LCD Bias Generation | Flash Memory Programming |
Use Scenario: Generating +12 V and –6 V rails for TFT source/gate drivers using dual-output discrete charge-pump stages. IC Role / Device Role / Timing Role: High-efficiency primary boost stage delivering regulated 12 V to downstream inverting charge pump. Use Value: 14 V max output supports wide TFT panel voltage requirements; thermal shutdown prevents latch-up during display initialization surges. |
Use Scenario: Providing 12 V programming voltage for NOR/NAND flash in handheld instruments and embedded controllers. IC Role / Device Role / Timing Role: On-demand boost converter activated only during write/erase cycles to minimize system power draw. Use Value: Active-low EN pin enables precise timing control; <2.5 µA shutdown current eliminates leakage during idle periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2622MMX | Same gated-oscillator architecture but rated for 2.2 A peak switch current; higher RDS(on) (0.22 Ω) and 1.24 V reference tolerance ±1.5%. | Better suited for higher-current loads (e.g., multi-LED strings); less optimal for ultra-low-IQ battery standby. | Select LM2622MMX when peak load exceeds 1.2 A and tighter VFB tolerance is required. |
| LM2733YMF/NOPB | Fixed-frequency PWM (1.6 MHz), 0.15 Ω RDS(on), 2.1 A current limit, no FREQ pin; requires external compensation. | Delivers lower output ripple and predictable EMI profile; lacks PFM efficiency at light loads and 1.1 V start-up. | Choose LM2733YMF/NOPB for noise-sensitive applications needing consistent switching frequency and higher peak current. |
Compared with LM2623LDX, LM2622MMX offers higher current capability at the cost of slightly lower light-load efficiency and larger solution size, while LM2733YMF/NOPB trades PFM flexibility for deterministic PWM behavior and improved heavy-load performance - neither is pin-compatible, and all require board-level redesign.
Availability
LM2623LDX is available at Aetrix Electronics and suitable for camera power supplies, white LED backlighting, TFT LCD bias generation, and flash memory programming requiring stable component supply, long-lifecycle support, and TI-qualified automotive-grade traceability.
Supply support for LM2623LDX 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 over 50 years of innovation in energy-efficient electronics.
The LM2623 belongs to TI's general-purpose DC-DC boost converter product line, engineered specifically for ultra-low-voltage battery-powered systems where start-up reliability, wide load efficiency, and minimal board area are critical design constraints.
FAQ
What is the minimum input voltage required for LM2623LDX to start switching?
The LM2623LDX starts switching at 1.1 V (typical) on the VDD pin - verified per Section 6.5 of the SNVS188I datasheet. This low start-up threshold enables operation from nearly exhausted 2-cell alkaline or 1-cell Li-ion batteries. Once started, the device sustains regulation down to 0.8 V input via bootstrapped VDD operation. The LM2623LDX datasheet specifies this value under "VDD_ST" with test condition ILOAD = 0 mA at TJ = 25°C.
Does LM2623LDX support adjustable switching frequency, and how is it configured?
Yes, LM2623LDX supports programmable switching frequency from 300 kHz to 2 MHz using an external resistor connected between VIN and the FREQ pin (Pin 5). The resistance value directly sets the oscillator frequency, as shown in Figure 3 of the SNVS188I datasheet. No capacitor is required for basic frequency setting - though adding C3 enables duty-cycle tuning. This resistor-based configuration simplifies layout and avoids trimming components in production.
What is the function of the C3 capacitor in LM2623LDX circuits, and why is its value determined empirically?
The C3 capacitor on the FREQ pin enables non-linear duty-cycle adjustment by dumping charge to manipulate the internal oscillator's on-time. As stated in Section 8.2.2.2 of the LM2623 datasheet, the correct C3 value cannot be calculated analytically due to dependence on input/output voltage ratios and parasitic effects - it must be selected via empirical testing while monitoring inductor peak current to avoid premature current-limit tripping or double-pulsing. This behavior is unique to the LM2623LDX among TI's boost converters.
How does LM2623LDX achieve high efficiency at very light loads?
LM2623LDX achieves high light-load efficiency through pulse frequency modulation (PFM), where the gated oscillator skips switching cycles once output regulation is met - reducing average switching losses. With only 80 µA typical operating current and <2.5 µA shutdown current, it minimizes static loss. This PFM behavior, combined with low RDS(on) (0.17 Ω) and optimized gate drive, enables >85% efficiency even at 10 mA load - confirmed in Figure 10 of the LM2623LDX datasheet.
Is LM2623LDX pin-compatible with other members of the LM262x family, such as LM2623MM or LM2623MFX?
No, LM2623LDX is not pin-compatible with LM2623MM (WSON-14) or LM2623MFX (VSSOP-8 with different pin mapping). While all share the same functional block diagram and electrical specifications, LM2623LDX uses the DGK (VSSOP-8) package with specific pin assignments defined in Section 5 of SNVS188I - notably EN on Pin 2, FREQ on Pin 5, FB on Pin 6, and VDD on Pin 10. Substituting packages requires PCB redesign and layout verification per TI's AN-1187 guidelines.
LM2623LDX 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)
LM2623LDX FAQ
1.How can I place an order for LM2623LDX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2623LDX 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 LM2623LDX reliable?
The price and inventory of LM2623LDX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2623LDX is usually 5 days.
3.What payment methods are accepted for LM2623LDX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2623LDX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2623LDX?
LM2623LDX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2623LDX 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 LM2623LDX?
For technical support, including LM2623LDX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2623LDX requirements.
6.How does Aetrix verify that LM2623LDX is sourced from the original manufacturer or authorized distributors?
All LM2623LDX 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 LM2623LDX meets industry standards.
7.What is the process for return or replacement of LM2623LDX?
All LM2623LDX units undergo pre-shipment inspection (PSI). If there is an issue with LM2623LDX, 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 LM2623LDX part is unused and in its original packaging.
Return procedure for LM2623LDX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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