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Texas Instruments LM2623LDX/NOPB
- Part No.:
- LM2623LDX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LM2623LDX/NOPB.pdf
- Description:
- IC REG BOOST ADJ 2.2A 14WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,288
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Product details
Overview
LM2623LDX/NOPB from Texas Instruments is a gated-oscillator-based DC-DC boost converter IC designed for battery-powered 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, integrates a 0.17 Ω N-channel MOSFET, and achieves up to 90% efficiency in handheld power management applications.
For engineers reviewing the LM2623LDX/NOPB datasheet, LM2623LDX/NOPB pinout, LM2623LDX/NOPB application, or LM2623LDX/NOPB equivalent, key selection criteria include start-up voltage (1.1 V), shutdown current (<2.5 µA), FB reference accuracy (±3%), programmable frequency (300 kHz–2 MHz), and thermal performance in VSSOP-8 package.
Technical Context
The LM2623LDX/NOPB implements Pulse Frequency Modulation (PFM) via a gated oscillator architecture that skips switching cycles upon regulation limit reach-enabling high efficiency across ultra-light to full load. Its duty cycle is programmable via external RC network on FREQ pin, supporting ratio-adaptive control for dynamic VIN/VOUT compensation.
It features an internal 0.17 Ω N-channel MOSFET switch, cycle-by-cycle peak current limiting (1.2 A typical), thermal shutdown (~160°C), and dual ground separation (PGND and SGND) to minimize noise coupling between power and signal 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 low-voltage legacy rails. |
| Start-up Voltage | 1.1 V - enables operation from nearly-dead 2-cell alkaline or 1-cell Li-ion at end-of-discharge. |
| Output Voltage Range | 1.24 V to 14 V - adjustable via external resistor divider; 1.24 V FB reference enables precise regulation. |
| Switching Frequency | 300 kHz to 2 MHz - externally set via resistor on FREQ pin; higher frequencies allow smaller magnetics. |
| Peak Switch Current Limit | 1.2 A - protects internal MOSFET during overload or short-circuit; non-latching, auto-recovering. |
| Quiescent Current | 80 µA - ensures minimal battery drain in active mode; <2.5 µA in shutdown for long standby life. |
| MOSFET RDS(on) | 0.17 Ω - reduces conduction loss at high load; improves efficiency especially below 3.3 V output. |
Pinout & Package
LM2623LDX/NOPB is packaged in an 8-pin VSSOP (DGK) with 3.00 mm × 3.00 mm body size and 1.09-mm height - half the footprint of standard SOIC-8 and optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PGND) | Power Ground | High-current return path for SW node; must be low-inductance connection to PCB ground plane. |
| 2 (EN) | Enable Input | Active-low logic control; <0.15×VDD disables regulator; >0.7×VDD enables normal operation. |
| 3 (FREQ) | Frequency Adjust | Analog input for external resistor; sets oscillator frequency and influences duty cycle programming. |
| 4 (FB) | Voltage Feedback | Monitors output via resistive divider; 1.24 V reference enables accurate output regulation. |
| 5 (SGND) | Signal Ground | Reference for FB, EN, FREQ; isolated from PGND to prevent noise coupling into feedback loop. |
| 6 (VDD) | Internal Supply | 3–5 V supply for control circuitry; can be bootstrapped from regulated output to extend low-VIN operation. |
| 7 (BOOT) | Bootstrap Supply | Provides gate drive voltage for internal N-MOSFET; requires external capacitor to SW and VDD. |
| 8 (SW) | Switch Node | Drain of internal N-MOSFET; connects to inductor and Schottky diode anode; handles high dv/dt. |
Key Features
| Feature | Design Value |
|---|---|
| Gated-oscillator PFM control | Enables >87% efficiency from 10 mA to full load without external compensation components. |
| Dual ground separation (PGND/SGND) | Reduces switching noise injection into feedback and enable circuits, improving regulation stability. |
| Programmable frequency & duty cycle | External R on FREQ pin sets base frequency; C3 capacitor enables ratio-adaptive duty cycle tuning. |
| Low 1.1 V start-up with bootstrap operation | Starts from near-dead batteries; sustains operation down to 0.8 V input using VDD bootstrapped from output. |
| Integrated thermal and current protection | Auto-shutdown at ~160°C junction temp; cycle-by-cycle current limit prevents MOSFET failure under fault. |
Applications
| White LED Backlighting | TFT LCD Power Supply |
|---|---|
|
Use Scenario: Driving parallel white LEDs in portable media players requiring stable 18–24 V from 2-cell alkaline. IC Role / Device Role / Timing Role: Step-up regulator providing constant-current source interface via external LED driver IC. Use Value: 1.1 V start-up ensures backlight remains functional until battery depletion; 90% efficiency extends playback time. |
Use Scenario: Generating 5 V and 12 V rails for TFT LCD bias and gate drivers in GPS handhelds. IC Role / Device Role / Timing Role: Primary boost converter supplying intermediate rail to secondary LDOs or charge pumps. Use Value: Programmable 2 MHz switching allows use of 1 µH inductors and 4.7 µF ceramic caps, minimizing board area. |
| Flash Memory Programming | Hand-Held Instrument Power |
|
Use Scenario: Providing 12 V programming voltage for NAND/NOR flash in field-programmable test tools. IC Role / Device Role / Timing Role: High-efficiency boost stage delivering short-duration, high-current pulses. Use Value: 1.2 A peak current limit and fast transient response ensure reliable programming voltage without overshoot. |
Use Scenario: Powering microcontroller, sensor front-end, and display in portable multimeters or data loggers. IC Role / Device Role / Timing Role: Main system supply converting 1.5–3.0 V battery stack to stable 3.3 V rail. Use Value: <2.5 µA shutdown current enables multi-year shelf life; VSSOP-8 footprint fits compact 2-layer PCBs. |
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; WSON-14 package only; no VSSOP option. | Better suited for 3.3 V → 5 V/1 A loads; less optimal for ultra-low-VIN start-up due to 1.25 V min start. | Select when higher output current or better thermal performance is required; not pin-compatible with LM2623LDX/NOPB. |
| LM2733YMF/NOPB | Fixed 500 kHz frequency; 3 A switch; 0.14 Ω RDS(on); requires external compensation. | Designed for fixed-frequency PWM operation; lacks gated-oscillator PFM efficiency at light loads. | Prefer for noise-sensitive applications needing predictable EMI spectrum; requires additional compensation design effort. |
Compared with LM2623LDX/NOPB, LM2622MM/NOPB offers higher current capability but sacrifices low-VIN start-up and package compatibility, while LM2733YMF/NOPB trades PFM efficiency for EMI predictability and higher peak current-making LM2623LDX/NOPB optimal for battery runtime-critical, space-constrained, wide-input-range designs.
Availability
LM2623LDX/NOPB is available at Aetrix Electronics and suitable for handheld instrumentation, portable display power, and flash memory programming requiring stable component supply, long-term manufacturability, and TI-qualified automotive-grade traceability.
Supply support for LM2623LDX/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 technologies, with decades of expertise in battery-efficient power conversion ICs.
The LM2623 belongs to TI's general-purpose boost converter product line, engineered specifically for ultra-low-input-voltage, high-efficiency DC-DC conversion in space- and energy-constrained portable electronics.
FAQ
What is the minimum input voltage required for LM2623LDX/NOPB to start up?
The LM2623LDX/NOPB starts up from as low as 1.1 V at room temperature, enabling operation from nearly depleted 2-cell alkaline or 1-cell lithium systems. Once started, it continues regulating down to 0.8 V input by bootstrapping VDD from its own output, making LM2623LDX/NOPB ideal for deep-discharge battery applications.
How does the LM2623LDX/NOPB achieve high efficiency across wide load ranges?
The LM2623LDX/NOPB uses a gated-oscillator PFM architecture that skips switching cycles under light load instead of reducing duty cycle, minimizing switching losses. Combined with an ultra-low 80 µA quiescent current and 0.17 Ω internal MOSFET, LM2623LDX/NOPB maintains >87% efficiency from 10 mA to full load without external compensation.
Can the switching frequency of LM2623LDX/NOPB be adjusted, and how?
Yes - the LM2623LDX/NOPB switching frequency is set by an external resistor connected between VIN and the FREQ pin, supporting 300 kHz to 2 MHz. A higher value resistor lowers frequency (reducing switching loss), while a lower value raises it (enabling smaller passive components). The LM2623LDX/NOPB datasheet provides a lookup table correlating R3 value to target frequency.
What is the role of the C3 capacitor in LM2623LDX/NOPB circuits?
The C3 capacitor on the FREQ pin enables duty cycle programming via a non-linear effect, allowing ratio-adaptive control that dynamically adjusts for changing VIN/VOUT conditions. As C3 value increases, duty cycle increases - critical for optimizing efficiency and preventing premature current-limit tripping. Selection requires empirical tuning per application, as no closed-form equation exists for C3.
Is LM2623LDX/NOPB pin-compatible with other TI boost converters like LM2622 or LM2733?
No - LM2623LDX/NOPB uses an 8-pin VSSOP (DGK) package with unique pin functions including separate PGND and SGND pins and FREQ-adjust capability. LM2622 is WSON-14 only; LM2733YMF/NOPB uses SOT-23-6 with different pinout and control architecture. Direct replacement requires PCB redesign; LM2623LDX/NOPB is not a drop-in substitute.
LM2623LDX/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)
LM2623LDX/NOPB FAQ
1.How can I place an order for LM2623LDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2623LDX/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 LM2623LDX/NOPB reliable?
The price and inventory of LM2623LDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2623LDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2623LDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2623LDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2623LDX/NOPB?
LM2623LDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2623LDX/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 LM2623LDX/NOPB?
For technical support, including LM2623LDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2623LDX/NOPB requirements.
6.How does Aetrix verify that LM2623LDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2623LDX/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 LM2623LDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2623LDX/NOPB?
All LM2623LDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2623LDX/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 LM2623LDX/NOPB part is unused and in its original packaging.
Return procedure for LM2623LDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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