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Texas Instruments LM2623AMM/NOPB
- Part No.:
- LM2623AMM/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM2623AMM/NOPB.pdf
- Description:
- IC REG BOOST ADJ 2.2A 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:19,337
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Product details
Overview
LM2623AMM/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 A load at low output voltages, features 0.17 Ω internal N-channel MOSFET, and achieves up to 90% efficiency in handheld instrumentation and multi-cell alkaline/Li-ion power rails.
For engineers reviewing the LM2623AMM/NOPB datasheet, LM2623AMM/NOPB pinout, LM2623AMM/NOPB application, or LM2623AMM/NOPB equivalent, key selection criteria include start-up voltage (1.1 V), shutdown current (<2.5 µA), programmable switching frequency (300 kHz–2 MHz), FB reference accuracy (±2.2% over −40°C to 85°C), and VSSOP-8 thermal performance (RθJA = 152.5°C/W).
Technical Context
The LM2623AMM/NOPB implements pulse-frequency modulation (PFM) via a gated oscillator architecture that skips switching cycles upon regulation limit attainment-enabling high efficiency across ultra-light to full loads. Its duty cycle is programmable using external RC components on the FREQ pin, allowing dynamic adaptation to input/output voltage ratio changes.
It integrates an internal 0.17 Ω N-channel MOSFET switch, cycle-by-cycle peak current limiting (2.85 A typical), thermal shutdown (~160°C), and dual ground separation (PGND and SGND) to minimize noise coupling. The VDD pin accepts 3–5 V supply and can be bootstrapped from the regulated output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.8 V to 14 V - supports single- to four-cell alkaline and one- to three-cell Li-ion battery stacks without external LDO pre-regulation. |
| Start-up Voltage | 1.1 V - enables reliable cold-start from partially discharged batteries in portable devices. |
| Output Voltage Range | 1.24 V to 14 V - adjustable via external resistor divider on FB pin; 1.24 V reference tolerance ±2.2% over temperature ensures stable setpoint accuracy. |
| Switching Frequency | 300 kHz to 2 MHz - externally set via resistor on FREQ pin; higher frequencies enable smaller magnetics and compact PCB layout. |
| Peak Switch Current Limit | 2.85 A typical - protects against overload and short-circuit while supporting ≥2 A continuous output at low VOUT. |
| Quiescent Current | 80 µA typical - minimizes standby power loss in always-on subsystems like real-time clocks or sensor wake logic. |
| Shutdown Current | <2.5 µA - extends battery life during deep-sleep modes in pagers, GPS units, and handheld instruments. |
| MOSFET RDS(on) | 0.17 Ω - reduces conduction loss and improves efficiency at high load currents, especially below 5 V output. |
Pinout & Package
LM2623AMM/NOPB 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 characterized by RθJA = 152.5°C/W, requiring careful PCB copper pour under PGND/SGND pins for heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Internally unconnected; must remain floating or tied to GND per layout best practice-no functional role. |
| 2 (EN) | Active-Low Enable | Shuts down regulator when pulled below 0.15×VDD; enables operation above 0.7×VDD-supports host-controlled power sequencing. |
| 3 (PGND) | Power Ground | Return path for high-current switch node; must be low-inductance connection to minimize SW node ringing and EMI. |
| 4 (FB) | Voltage Feedback Input | Monitors output via resistive divider; 1.24 V reference sets regulation point-accuracy directly determines output stability. |
| 5 (FREQ) | Frequency Adjustment | Analog input for external resistor; sets oscillator frequency and influences duty cycle-enables optimization for efficiency vs. size trade-offs. |
| 6 (SGND) | Signal Ground | Reference for FB, EN, FREQ, and VDD; isolated from PGND to prevent noise coupling into feedback loop. |
| 7 (VDD) | Internal Supply Input | Accepts 3–5 V; powers control circuitry-can be bootstrapped from VOUT to sustain operation below 0.8 V input after startup. |
| 8 (SW) | Switch Node | Drain of internal N-MOSFET; connects to inductor and Schottky diode anode-high dV/dt node requiring tight layout and minimal trace length. |
Key Features
| Feature | Design Value |
|---|---|
| Gated Oscillator PFM Control | Skips switching cycles instead of modulating pulse width-maintains >85% efficiency from 1 mA to 2 A load without external compensation. |
| Programmable Duty Cycle | Enabled via C3 capacitor on FREQ pin-allows dynamic adjustment to match input/output voltage ratio, reducing output ripple and inductor stress. |
| Dual Ground Separation | Independent PGND (power return) and SGND (signal reference) pins-prevents switching noise from corrupting FB and EN signals. |
| Low-Voltage Start-up | 1.1 V minimum-enables operation from weak or aging batteries in medical sensors and remote controls before regulation begins. |
| Integrated Thermal Protection | Auto-shutdown at ~160°C junction temperature with hysteresis-prevents damage during sustained overload or poor heatsinking. |
| Ultra-Low Shutdown Current | <2.5 µA over temperature-reduces annual battery drain to <22 µAh, critical for 10-year shelf-life applications like smoke detectors. |
Applications
| Handheld Medical Sensors | Multi-Cell Alkaline Power Rails |
|---|---|
|
Use Scenario: Portable blood glucose meters and pulse oximeters powered by two AA alkaline cells with declining voltage over time. IC Role / Device Role / Timing Role: Step-up regulator maintaining stable 3.3 V rail for MCU, ADC, and display backlight as cell voltage drops from 3.2 V to 1.6 V. Use Value: 1.1 V start-up and 0.8 V operational minimum ensure full device functionality across entire battery discharge curve without brownouts. |
Use Scenario: PDAs and barcode scanners using 3-cell alkaline packs (4.5 V nominal) requiring 5 V for USB peripherals and memory interfaces. IC Role / Device Role / Timing Role: Boost converter generating regulated 5 V output from variable 3.0–4.8 V input, synchronized to system power-on reset timing. Use Value: 90% peak efficiency and 80 µA quiescent current extend runtime by >18% versus legacy charge-pump solutions in intermittent-use devices. |
| Lithium-Ion Powered GPS Receivers | TFT LCD Backlight Drivers |
|
Use Scenario: Automotive-grade GPS modules powered by single-cell Li-ion (2.7–4.2 V) needing clean 3.3 V for RF front-end and baseband processor. IC Role / Device Role / Timing Role: Primary DC-DC regulator supplying low-noise 3.3 V rail with fast transient response to burst-mode GNSS signal acquisition. Use Value: Dual-ground isolation (PGND/SGND) and PFM operation suppress switching noise below −75 dBc, preventing RF desensitization. |
Use Scenario: Industrial handheld terminals with 3.5-inch TFT displays requiring 18–22 V for LED backlight strings driven from 3.7 V Li-ion battery. IC Role / Device Role / Timing Role: High-voltage boost stage delivering up to 22 V at 120 mA, controlled via PWM dimming signal applied to EN pin. Use Value: 2.85 A peak current limit and 0.17 Ω RDS(on) support high-duty-cycle backlight operation without thermal derating or output sag. |
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 | Lower peak current limit (1.2 A), same 8-pin VSSOP package and 1.24 V FB reference. | Targeted at ≤1 A loads (e.g., low-power sensors); lacks C3-based duty-cycle programming capability. | Select LM2622MM/NOPB only when output current demand is ≤1 A and design does not require adaptive duty cycle tuning. |
| LM2733YMF/NOPB | Higher switching frequency (up to 3 MHz), 0.25 Ω RDS(on), 1.215 V FB reference, SOT-23-6 package. | Better suited for ultra-compact layouts with small inductors; lower max output current (1.2 A) and reduced thermal margin. | Choose LM2733YMF/NOPB when board area is constrained and load current stays below 1.2 A-avoid for high-current or thermally limited designs. |
Compared with LM2622MM/NOPB and LM2733YMF/NOPB, LM2623AMM/NOPB uniquely combines 2.85 A peak current capability, programmable duty cycle via FREQ/C3, and dual-ground architecture-making it the only option among the three capable of sustaining 2 A loads with low-noise regulation in battery-powered instrumentation.
Availability
LM2623AMM/NOPB is available at Aetrix Electronics and suitable for handheld medical sensors, multi-cell alkaline power rails, lithium-ion powered GPS receivers, and TFT LCD backlight drivers requiring stable component supply, long-lifecycle availability, and TI-qualified production lots.
Supply support for LM2623AMM/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 experience in battery-efficient power conversion ICs.
The LM2623 belongs to TI's general-purpose boost converter product line, engineered specifically for wide-input, low-quiescent-current applications in portable electronics where battery life, small footprint, and robust start-up behavior are critical.
FAQ
What is the minimum input voltage required for LM2623AMM/NOPB to start up?
The LM2623AMM/NOPB has a guaranteed start-up voltage of 1.1 V at 25°C. Once started, it continues operating down to 0.8 V input due to bootstrap powering from the VDD pin. This allows the LM2623AMM/NOPB to function across the full discharge curve of two alkaline or one Li-ion cell without external assist circuitry.
How does the FREQ pin on LM2623AMM/NOPB affect switching behavior?
The FREQ pin on LM2623AMM/NOPB sets the oscillator frequency via an external resistor (300 kHz–2 MHz range) and enables duty-cycle programming when used with capacitor C3. Unlike fixed-frequency PWM controllers, this configuration allows the LM2623AMM/NOPB to dynamically adapt its on-time to input/output voltage ratios-reducing output ripple and improving light-load efficiency.
Can LM2623AMM/NOPB drive a 5 V, 2 A load from a 3.3 V input?
Yes-the LM2623AMM/NOPB supports up to 2 A output at low output voltages (e.g., 5 V) when input is ≥3.3 V, provided thermal design accommodates power dissipation. Its 0.17 Ω internal MOSFET and 90% peak efficiency enable this performance, but layout must minimize PGND inductance and maximize copper area under the VSSOP-8 package.
What is the purpose of separate PGND and SGND pins on LM2623AMM/NOPB?
LM2623AMM/NOPB uses separate PGND (Pin 3) and SGND (Pin 6) to isolate high-current switching return paths from sensitive analog reference nodes. PGND carries pulsed inductor current, while SGND serves FB, EN, FREQ, and VDD-preventing ground bounce from degrading regulation accuracy or causing false shutdowns in noise-sensitive applications.
Is LM2623AMM/NOPB RoHS-compliant and lead-free?
Yes-LM2623AMM/NOPB is manufactured in TI's RoHS-compliant, lead-free VSSOP-8 package (NOPB suffix denotes "No Pb"), meeting JEDEC J-STD-020 moisture sensitivity level 2a and qualified for reflow soldering per IPC/JEDEC J-STD-020 standards.
LM2623AMM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- 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:
- 8-VSSOP
LM2623AMM/NOPB FAQ
1.How can I place an order for LM2623AMM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2623AMM/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 LM2623AMM/NOPB reliable?
The price and inventory of LM2623AMM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2623AMM/NOPB is usually 5 days.
3.What payment methods are accepted for LM2623AMM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2623AMM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2623AMM/NOPB?
LM2623AMM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2623AMM/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 LM2623AMM/NOPB?
For technical support, including LM2623AMM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2623AMM/NOPB requirements.
6.How does Aetrix verify that LM2623AMM/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2623AMM/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 LM2623AMM/NOPB meets industry standards.
7.What is the process for return or replacement of LM2623AMM/NOPB?
All LM2623AMM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2623AMM/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 LM2623AMM/NOPB part is unused and in its original packaging.
Return procedure for LM2623AMM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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