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Texas Instruments LM2623ALD/NOPB
- Part No.:
- LM2623ALD/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LM2623ALD/NOPB.pdf
- Description:
- IC REG BOOST ADJ 2.2A 14WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,360
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Product details
Overview
LM2623ALD/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, features 0.17 Ω internal N-channel MOSFET, and achieves up to 90% efficiency in handheld power management applications.
For engineers reviewing the LM2623ALD/NOPB datasheet, LM2623ALD/NOPB pinout, LM2623ALD/NOPB application, or LM2623ALD/NOPB equivalent, key selection criteria include start-up voltage (1.1 V), shutdown current (<2.5 µA), programmable switching frequency (300 kHz–2 MHz), and compatibility with 2-cell alkaline or lithium-ion battery inputs.
Technical Context
The LM2623ALD/NOPB implements pulse frequency modulation (PFM) via a gated oscillator architecture that skips switching cycles upon regulation limit reach-enabling high efficiency across wide load ranges. Its duty cycle is programmable using external RC components on the FREQ pin, allowing dynamic adaptation to input/output voltage ratios.
It integrates an internal 0.17 Ω N-channel MOSFET switch, peak current limiting (2.85 A typical), thermal shutdown (~160°C), and dual ground separation (PGND and SGND) to minimize noise coupling in sensitive analog 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/lithium batteries and post-regulated supplies. |
| Start-up Voltage | 1.1 V - enables operation from deeply discharged 2-cell alkaline or 1-cell Li-ion sources. |
| Output Voltage Range | 1.24 V to 14 V - set by external resistor divider on FB pin; reference accuracy ±2.2% over temperature. |
| Switching Frequency | 300 kHz to 2 MHz - externally programmed via resistor on FREQ pin; higher frequencies enable smaller magnetics. |
| Peak Switch Current Limit | 2.85 A typical - protects internal MOSFET during overload or short-circuit conditions. |
| Quiescent Current | 80 µA typical - ensures minimal battery drain during active operation in portable devices. |
| Shutdown Current | <2.5 µA - extends battery life in standby mode; controlled by active-low EN pin. |
| RDS(on) | 0.17 Ω - reduces conduction loss and improves efficiency at high load currents. |
Pinout & Package
LM2623ALD/NOPB is packaged in an 8-pin VSSOP (DGK) package measuring 3.0 mm × 3.0 mm with 1.09-mm height, optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 2) | Active-low enable input | Logic-low (<0.15×VDD) disables regulator and reduces supply current to <2.5 µA. |
| FREQ (Pin 3) | Frequency programming node | External resistor sets switching frequency; optional capacitor enables duty-cycle tuning. |
| FB (Pin 4) | Feedback input | Monitors output via resistive divider; regulates output to 1.24 V reference at this pin. |
| VDD (Pin 5) | Internal circuit power supply | Must be 3–5 V; can be bootstrapped from output to sustain operation below 0.8 V input. |
| BOOT (Pin 6) | Bootstrap gate drive supply | Provides gate voltage for internal N-MOSFET; requires external 100 pF capacitor to SW. |
| SW (Pin 7) | Switch node | Drain of internal MOSFET; connects to inductor and Schottky diode anode; handles high dv/dt. |
| PGND (Pin 8) | Power ground | High-current return path for MOSFET and diode; must be shorted to SGND at single point. |
| SGND (Pin 1) | Signal ground | Reference for FB, EN, FREQ; isolated from PGND to prevent noise injection into feedback loop. |
Key Features
| Feature | Design Value |
|---|---|
| Gated-oscillator PFM control | Delivers >87% efficiency across 1 mA–2 A loads without requiring external compensation. |
| Programmable frequency & duty cycle | Enables optimization for EMI, size, and efficiency via R/C on FREQ pin-no additional controller needed. |
| Ultra-low shutdown current | <2.5 µA ensures multi-month shelf life in battery-powered devices with infrequent wake-up cycles. |
| Integrated 0.17 Ω N-MOSFET | Eliminates external high-side switch; reduces BOM count and layout complexity in boost topologies. |
| Dual ground separation (PGND/SGND) | Minimizes switching noise coupling into feedback and enable circuits-critical for stable light-load regulation. |
| Thermal and current protection | Auto-recovery thermal shutdown (~160°C) and cycle-by-cycle current limiting prevent damage under fault conditions. |
Applications
| Camera Power Supply | White LED Backlight Driver |
|---|---|
Use Scenario: Boosting 2-cell alkaline (2.0–3.2 V) to 5 V for digital camera flash and sensor bias rails. IC Role / Device Role / Timing Role: Primary step-up regulator providing regulated 5 V with fast transient response to pulsed flash loads. Use Value: 1.1 V start-up enables operation even after extended storage; 2.85 A current limit sustains flash capacitor charging without latch-up. | Use Scenario: Driving parallel white LEDs from single-cell Li-ion (3.0–4.2 V) in smartphone displays. IC Role / Device Role / Timing Role: Constant-voltage boost stage supplying 5.5 V to LED driver ICs with tight output ripple. Use Value: 80 µA quiescent current minimizes standby drain; programmable frequency avoids audible noise in display power domain. |
| Handheld Instrument Power | TFT LCD Bias Supply |
Use Scenario: Generating +12 V and –5 V rails (with external inverter) from 3.3 V system supply in portable test equipment. IC Role / Device Role / Timing Role: High-efficiency positive boost converter feeding downstream charge pumps or LDOs. Use Value: 0.17 Ω RDS(on) maintains >85% efficiency at 150 mA load; 14 V max output supports wide range of analog front-end requirements. | Use Scenario: Providing AVDD (10–12 V) and VGH (15–20 V) for TFT panel gate drivers in industrial HMIs. IC Role / Device Role / Timing Role: Primary boost stage delivering stable high-voltage bias with low output ripple. Use Value: Dual ground isolation prevents switching noise from corrupting sensitive analog timing signals in display interface paths. |
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 3.5 A current limit; fixed 500 kHz frequency; no FREQ pin for duty-cycle tuning. | Better suited for higher-current, fixed-frequency designs where simplicity outweighs programmability. | Select LM2622MM/NOPB when peak load exceeds 2 A or when layout constraints favor fixed-frequency EMI filtering. |
| LM27313XMF/NOPB | Lower 1.2 A current limit; integrated Schottky diode; 1.6 MHz fixed frequency; smaller SOT-23-6 package. | Ideal for ultra-compact, low-power applications where board area is more critical than peak current capability. | Choose LM27313XMF/NOPB for space-constrained wearables or sensors needing <1 A output with minimal external components. |
Compared with LM2622MM/NOPB and LM27313XMF/NOPB, LM2623ALD/NOPB uniquely balances programmable frequency/duty cycle, 2.85 A current capability, and 8-pin VSSOP footprint-making it optimal for mid-power portable systems requiring design flexibility and proven reliability.
Availability
LM2623ALD/NOPB is available at Aetrix Electronics and suitable for camera power supplies, white LED backlight drivers, handheld instrument power rails, TFT LCD bias generation, and 2-cell alkaline/lithium-ion battery systems requiring stable component supply and long-term manufacturability.
Supply support for LM2623ALD/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 company specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in energy-efficient electronics.
The LM2623ALD/NOPB belongs to TI's general-purpose DC-DC boost converter product line, engineered specifically for battery-powered portable electronics demanding low start-up voltage, high light-load efficiency, and compact integration.
FAQ
What is the minimum input voltage required for LM2623ALD/NOPB to start up?
The LM2623ALD/NOPB has a guaranteed start-up voltage of 1.1 V at 25°C. This allows reliable operation from partially discharged 2-cell alkaline or 1-cell lithium-ion batteries. Once started, the device can continue regulating down to 0.8 V input by bootstrapping VDD from the output rail-ensuring uninterrupted power delivery during battery depletion. The LM2623ALD/NOPB achieves this via internal charge-pump circuitry tied to the BOOT and VDD pins.
How does the FREQ pin on LM2623ALD/NOPB affect switching behavior?
The FREQ pin on LM2623ALD/NOPB sets the oscillator frequency via an external resistor (300 kHz–2 MHz range) and enables duty-cycle tuning when paired with a capacitor (C3). This "ratio adaptive gated oscillator" dynamically adjusts on-time to match input/output voltage ratios-reducing output ripple and improving efficiency across varying battery states. Incorrect C3 selection may cause premature current-limit triggering or double-pulsing, so empirical validation is required per application. The LM2623ALD/NOPB datasheet provides guidance on C3 selection based on VIN/VOUT combinations.
Can LM2623ALD/NOPB drive a 2-A load continuously?
The LM2623ALD/NOPB supports up to 2 A load current at low output voltages (e.g., 3.3 V out from 2-cell input) under proper thermal conditions-verified in TI's typical application circuits. Sustained 2 A operation requires adequate PCB copper area for PGND/SGND, use of recommended 4.7 µH inductor and Schottky diode, and ambient temperature ≤60°C. At higher output voltages or elevated temperatures, derating applies due to power dissipation limits. The LM2623ALD/NOPB internal 0.17 Ω MOSFET and thermal shutdown (~160°C) protect against overload, but continuous 2 A should be validated with thermal imaging in final layout.
What is the purpose of separating PGND and SGND on LM2623ALD/NOPB?
LM2623ALD/NOPB separates PGND (power ground) and SGND (signal ground) to isolate high-current switching return paths from sensitive analog nodes (FB, EN, FREQ). PGND carries pulsed inductor current and diode reverse-recovery current, which induces noise via parasitic inductance. Routing PGND and SGND separately-and connecting them at a single point near the IC-prevents this noise from modulating the 1.24 V feedback reference or causing false shutdowns. This separation is essential for stable regulation, especially at light loads where PFM skipping edges are susceptible to ground bounce. The LM2623ALD/NOPB pinout enforces this best practice through dedicated pins.
Does LM2623ALD/NOPB require an external Schottky diode?
Yes, LM2623ALD/NOPB requires an external Schottky diode connected between the SW pin and output capacitor. The internal MOSFET serves only as the high-side switch; the diode provides the current path during off-time to charge the output capacitor and supply the load. TI specifies Schottky type due to its low forward voltage and fast recovery-critical for minimizing conduction loss and preventing efficiency collapse at high frequencies. Standard rectifier diodes introduce excessive recovery losses and voltage spikes. The LM2623ALD/NOPB datasheet recommends diodes rated ≥1.5× peak input current and ≥1.2× output voltage, such as the SS34 or similar.
LM2623ALD/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)
LM2623ALD/NOPB FAQ
1.How can I place an order for LM2623ALD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2623ALD/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 LM2623ALD/NOPB reliable?
The price and inventory of LM2623ALD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2623ALD/NOPB is usually 5 days.
3.What payment methods are accepted for LM2623ALD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2623ALD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2623ALD/NOPB?
LM2623ALD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2623ALD/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 LM2623ALD/NOPB?
For technical support, including LM2623ALD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2623ALD/NOPB requirements.
6.How does Aetrix verify that LM2623ALD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2623ALD/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 LM2623ALD/NOPB meets industry standards.
7.What is the process for return or replacement of LM2623ALD/NOPB?
All LM2623ALD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2623ALD/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 LM2623ALD/NOPB part is unused and in its original packaging.
Return procedure for LM2623ALD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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