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Texas Instruments LM2623MMX/NOPB
- Part No.:
- LM2623MMX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM2623MMX/NOPB.pdf
- Description:
- IC REG BOOST ADJ 2.2A 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,424
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Product details
Overview
LM2623MMX/NOPB from Texas Instruments is a general-purpose, gated-oscillator-based DC-DC boost converter IC designed for battery-powered systems. It accepts 0.8–14 V input, delivers 1.24–14 V adjustable output, integrates a 0.17 Ω N-channel MOSFET switch, supports up to 2 MHz switching frequency, and operates down to 1.1 V start-up voltage - enabling use in single- or dual-cell alkaline/Li-ion portable devices such as handheld instruments and white LED backlighting.
For engineers reviewing the LM2623MMX/NOPB datasheet, LM2623MMX/NOPB pinout, LM2623MMX/NOPB application, or LM2623MMX/NOPB equivalent, key selection criteria include its gated-oscillator PFM control architecture, programmable frequency via external resistor, duty-cycle tuning capability using C3 capacitor, and thermal/overcurrent protection features critical for compact, low-quiescent-power boost designs.
Technical Context
The LM2623MMX/NOPB implements a pulse-frequency-modulated (PFM) gated-oscillator topology with cycle-by-cycle current limiting and thermal shutdown. Its regulation relies on skipping switching cycles when the FB pin reaches 1.24 V threshold, enabling high efficiency across wide load ranges without requiring external compensation.
Frequency is set by an external resistor (R3) between VIN and FREQ pin (300 kHz–2 MHz range), while duty cycle is dynamically adjusted via C3 capacitor to match input/output voltage ratio - a "ratio-adaptive" behavior that reduces output ripple and improves light-load efficiency compared to fixed-frequency PWM converters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.8 V to 14 V - supports operation below 1 V after startup, enabling deep battery discharge utilization in 1–4 cell systems. |
| Output Voltage Range | 1.24 V to 14 V - adjustable via resistive divider on FB pin; reference accuracy ±2.2% over −40°C to 85°C ensures stable regulation. |
| Switching Frequency | 300 kHz to 2 MHz - externally programmable with R3; higher frequencies allow smaller magnetics and capacitors in space-constrained layouts. |
| Peak Switch Current Limit | 1.2 A typical - internal cycle-by-cycle current limit prevents MOSFET damage during overload or short-circuit conditions. |
| Quiescent Current | 80 µA typical - enables >1000-hour standby in battery-powered applications; drops to <2.5 µA in shutdown mode. |
| MOSFET RDS(on) | 0.17 Ω - low conduction loss improves efficiency at medium loads; increases to 0.26 Ω max over temperature range. |
| Start-up Voltage | 1.1 V - allows reliable boot from nearly depleted batteries; internal charge pump enables continued operation down to 0.8 V once running. |
Pinout & Package
LM2623MMX/NOPB 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 thermally constrained portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 2) | Active-low enable input | Pulls device into <2.5 µA shutdown when voltage <0.15×VDD; logic-high >0.7×VDD required for normal operation. |
| FREQ (Pin 5) | Frequency programming node | Resistor-connected to VIN sets oscillator frequency; optional C3 capacitor enables duty-cycle adaptation for PFM optimization. |
| FB (Pin 6) | Feedback input | Monitors output via resistive divider; regulates when voltage = 1.24 V; tolerance affects output accuracy and line/load regulation. |
| VDD (Pin 10) | Internal circuit power supply | Must be 3–5 V; typically bootstrapped from output; ripple >200 mV degrades efficiency and stability. |
| BOOT (Pin 11) | Bootstrap gate drive supply | Charges internal bootstrap capacitor to drive N-MOSFET gate above SW voltage; requires low-ESR ceramic capacitor. |
| SW (Pins 12 & 13) | Switch node | Drain of internal N-MOSFET; carries high di/dt switching current; layout must minimize parasitic inductance to prevent voltage spikes. |
| PGND (Pins 2 & 3) | Power ground | High-current return path for MOSFET and inductor; must be shorted together and connected to low-impedance ground plane. |
| SGND (Pin 9) | Signal ground | Reference for FB, EN, FREQ; isolated from PGND to avoid noise coupling into feedback loop. |
Key Features
| Feature | Design Value |
|---|---|
| Gated-oscillator PFM control | Enables >87% efficiency across 1 mA–500 mA loads without external compensation components. |
| Programmable switching frequency | 300 kHz–2 MHz via single external resistor - balances EMI, size, and efficiency for specific application needs. |
| Duty-cycle adaptability | C3 capacitor enables dynamic duty-cycle adjustment to match input/output voltage ratio, reducing output ripple and improving light-load stability. |
| Low-voltage start-up | 1.1 V minimum start-up voltage extends usable battery life in 1–2 cell alkaline/Li-ion systems. |
| Integrated protection | Cycle-by-cycle current limit (1.2 A typ.) and thermal shutdown (>160°C) prevent failure under fault conditions without external circuitry. |
Applications
| Camera Flash Power Supply | White LED Backlight Driver |
|---|---|
Use Scenario: Boosting 2.4–3.6 V Li-ion battery voltage to 5–6 V for xenon flash capacitor charging in compact digital cameras. IC Role / Device Role / Timing Role: Primary step-up regulator providing regulated high-current pulses; gated-oscillator PFM ensures minimal quiescent draw between flashes. Use Value: 87% efficiency at 500 mA enables faster flash recharge times and reduced thermal stress in sealed camera housings. | Use Scenario: Driving parallel strings of white LEDs (3.0–3.6 V forward) from a single 1.5–3.0 V alkaline or NiMH cell in portable media players. IC Role / Device Role / Timing Role: Constant-voltage boost converter with adjustable output; FB pin feedback maintains consistent LED brightness across battery discharge. Use Value: 1.1 V start-up and <2.5 µA shutdown current extend runtime by >20% versus higher-threshold alternatives. |
| Handheld Instrument Power Rail | TFT LCD Bias Supply |
Use Scenario: Generating stable 5 V or 12 V rails from 2-cell alkaline (2.0–3.2 V) for microcontroller, sensor, and display subsystems in field test equipment. IC Role / Device Role / Timing Role: General-purpose boost regulator with programmable frequency; EN pin enables system-level power sequencing and sleep-mode control. Use Value: 0.17 Ω internal MOSFET and 80 µA quiescent current support >1000-hour battery life in always-on monitoring modes. | Use Scenario: Providing positive and negative bias voltages (e.g., +10 V / −5 V) for TFT LCD gate drivers in portable navigation devices using dual-cell Li-ion input. IC Role / Device Role / Timing Role: Core boost stage feeding external inverting charge pump; FREQ pin allows EMI optimization near sensitive RF sections. Use Value: 2 MHz max switching frequency permits use of 1 µH inductors and 4.7 µF ceramic capacitors, minimizing board area in tight bezel designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2622MMX/NOPB | Higher peak switch current (2.85 A typ.), same 8-pin VSSOP package, identical pinout and control architecture. | Better suited for 3.3 V → 5 V conversion at >1 A loads; improved thermal margin due to higher current rating. | Select LM2622MMX/NOPB when output current exceeds 1 A or when operating near thermal limits with high ambient temperatures. |
| LM2733YMF/NOPB | Fixed 1.6 MHz switching frequency, integrated Schottky diode, 5-pin SOT-23 package, lower 0.6 V start-up voltage. | Smaller solution size but less flexible frequency/duty-cycle tuning; no external FREQ or C3 configuration options. | Choose LM2733YMF/NOPB for ultra-compact, cost-sensitive designs where fixed-frequency operation and integrated diode simplify BOM. |
Compared with LM2622MMX/NOPB, the LM2623MMX/NOPB offers lower cost and sufficient current capability for sub-1 A applications, while LM2733YMF/NOPB trades configurability for miniaturization - making LM2623MMX/NOPB optimal for mid-complexity portable boost designs requiring balance of flexibility, efficiency, and footprint.
Availability
LM2623MMX/NOPB is available at Aetrix Electronics and suitable for camera flash power supplies, white LED backlight drivers, handheld instrument power rails, and TFT LCD bias supplies requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2623MMX/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 delivering analog and embedded processing solutions, with decades of expertise in power management IC design and manufacturing.
The LM2623 belongs to TI's general-purpose DC-DC boost converter product line, engineered specifically for battery-powered portable electronics requiring high efficiency across wide load ranges, low quiescent current, and robust start-up from weak cells.
FAQ
What is the minimum input voltage required for LM2623MMX/NOPB to start up?
The LM2623MMX/NOPB has a guaranteed start-up voltage of 1.1 V at 25°C. Once started, it continues regulating down to 0.8 V input due to bootstrapping from the output through the VDD pin. This enables reliable operation from deeply discharged alkaline or lithium cells, extending usable battery capacity in portable systems.
How does the FREQ pin on LM2623MMX/NOPB affect switching behavior?
The FREQ pin on LM2623MMX/NOPB sets the oscillator frequency via an external resistor to VIN, supporting 300 kHz–2 MHz operation. Adding a capacitor (C3) between FREQ and ground introduces non-linear duty-cycle adaptation, allowing the LM2623MMX/NOPB to dynamically adjust on-time to match input/output voltage ratios - a key feature for optimizing PFM efficiency and ripple performance.
Can LM2623MMX/NOPB drive multiple white LEDs in series?
Yes - the LM2623MMX/NOPB can drive series-connected white LEDs by setting the output voltage via the FB resistive divider to match the total forward voltage (e.g., 3.0–3.6 V per LED × number of LEDs). Its 1.24–14 V adjustable range and 1.2 A peak switch current support common configurations like 3–4 LEDs at ~20 mA, provided thermal design accommodates power dissipation.
What is the purpose of separating PGND and SGND pins on LM2623MMX/NOPB?
LM2623MMX/NOPB separates PGND (pins 2 & 3) and SGND (pin 9) to isolate high-current power return paths from sensitive analog reference nodes. PGND carries pulsed inductor current and MOSFET switching return, while SGND serves as quiet reference for FB, EN, and FREQ. Proper separation minimizes noise coupling into the feedback loop, ensuring stable regulation and reduced output ripple.
Does LM2623MMX/NOPB include built-in protection features?
Yes - LM2623MMX/NOPB integrates cycle-by-cycle peak current limiting (1.2 A typical), thermal shutdown (>160°C junction), and under-voltage lockout. These protections operate autonomously without external components, safeguarding the IC and external circuitry during overload, short-circuit, or overheating events - critical for unattended portable equipment.
LM2623MMX/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
LM2623MMX/NOPB FAQ
1.How can I place an order for LM2623MMX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2623MMX/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 LM2623MMX/NOPB reliable?
The price and inventory of LM2623MMX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2623MMX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2623MMX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2623MMX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2623MMX/NOPB?
LM2623MMX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2623MMX/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 LM2623MMX/NOPB?
For technical support, including LM2623MMX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2623MMX/NOPB requirements.
6.How does Aetrix verify that LM2623MMX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2623MMX/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 LM2623MMX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2623MMX/NOPB?
All LM2623MMX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2623MMX/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 LM2623MMX/NOPB part is unused and in its original packaging.
Return procedure for LM2623MMX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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