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Texas Instruments LM2623MM/NOPB
- Part No.:
- LM2623MM/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM2623MM/NOPB.pdf
- Description:
- IC REG BOOST ADJ 2.2A 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:11,556
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Product details
Overview
LM2623MM/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 adjustable 1.24–14 V output, features 0.17 Ω internal N-channel MOSFET, 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.
For engineers reviewing the LM2623MM/NOPB datasheet, LM2623MM/NOPB pinout, LM2623MM/NOPB application, or LM2623MM/NOPB equivalent, key selection criteria include its PFM regulation mode, programmable frequency via external resistor, duty-cycle adaptability using C3 capacitor, and thermal protection with cycle-by-cycle current limiting - all critical for low-quiescent, high-efficiency boost designs in space-constrained handheld electronics.
Technical Context
The LM2623MM/NOPB implements a gated-oscillator control scheme with Pulse Frequency Modulation (PFM), skipping switching cycles once regulation is reached to maintain efficiency across wide load ranges. Its oscillator frequency (300 kHz–2 MHz) is set by an external resistor on the FREQ pin, while duty cycle adaptation uses a nonlinear C3 capacitor network to dynamically compensate for input/output voltage ratio changes.
Startup begins at 1.1 V with continuous switching until VOUT reaches ~3 V, after which feedback-controlled gated oscillation takes over. Internal circuitry is powered via bootstrapped VDD from the output, allowing operation below 0.8 V input once regulated - supported by integrated thermal shutdown (~160°C trip) and peak switch current limit (1.2 A typical for LM2623 variant).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.8 V to 14 V - enables direct operation from 1–4 cell alkaline or 1–3 cell Li-ion batteries without pre-regulation. |
| Output Voltage Range | 1.24 V to 14 V - adjustable via external resistive divider (FB pin), supporting white LED bias, TFT LCD supplies, and flash programming voltages. |
| Switching Frequency | 300 kHz to 2 MHz - selectable with external resistor on FREQ pin; higher frequencies allow smaller inductors and capacitors. |
| Internal MOSFET RDS(on) | 0.17 Ω (typ) - reduces conduction loss and improves efficiency at moderate loads, especially below 5 V output. |
| Start-up Voltage | 1.1 V - allows reliable startup from nearly depleted single-cell alkaline or Li-ion sources before bootstrapping VDD. |
| Quiescent Current | 80 µA (typ) - minimizes standby power draw in always-on portable systems such as pagers and GPS receivers. |
| Shutdown Current | < 2.5 µA (ensured) - extends battery life during system sleep modes without requiring external disconnect circuitry. |
| Peak Switch Current Limit | 1.2 A - protects against overload and short-circuit conditions; distinct from LM2623A (2.85 A typical). |
Pinout & Package
LM2623MM/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 |
|---|---|---|
| 1 (NC) | No Connect | Unused pin; must be left floating or tied to GND per layout guidelines - no internal connection. |
| 2 (EN) | Active-Low Enable | Logic input: <0.15×VDD forces shutdown; >0.7×VDD enables regulation - supports host MCU-controlled power sequencing. |
| 3 (PGND) | Power Ground | High-current return path for internal MOSFET and external inductor; requires low-inductance connection to PCB ground plane. |
| 4 (FB) | Voltage Feedback | Analog input sensing output voltage via resistive divider; 1.24 V reference sets regulation point - determines final VOUT accuracy. |
| 5 (FREQ) | Frequency Programming | Analog input accepting external resistor to set oscillator frequency; value directly scales switching frequency (300 kHz–2 MHz). |
| 6 (SGND) | Signal Ground | Low-noise reference for FB, EN, and FREQ pins; must be isolated from PGND except at single-point star ground to avoid noise coupling. |
| 7 (VDD) | Internal Supply Input | Power rail for control circuitry; typically bootstrapped from VOUT; must be 3–5 V and filtered to prevent efficiency degradation. |
| 8 (SW) | Switch Node | Drain of internal N-MOSFET; connects to inductor and Schottky diode anode - carries high dv/dt and di/dt; requires tight layout. |
Key Features
| Feature | Design Value |
|---|---|
| Gated-oscillator PFM control | Enables >87% efficiency across 10 mA–500 mA loads without external compensation - ideal for variable-load battery systems. |
| Programmable switching frequency | Resistor-adjustable 300 kHz–2 MHz range allows optimization of size vs. EMI: higher frequencies shrink magnetics but increase switching loss. |
| Duty-cycle adaptability via C3 | Nonlinear C3 capacitor network enables dynamic duty-cycle tuning to match VIN/VOUT ratio - reduces output ripple and improves light-load stability. |
| Integrated thermal protection | Auto-shutdown at ~160°C junction temperature prevents damage during sustained overload or poor heatsinking - recovers at ~135°C. |
| Low 1.1-V start-up capability | Allows boost operation from near-dead cells; internal charge pump and bootstrap architecture sustain regulation below 0.8 V after startup. |
| 8-pin VSSOP package | 3×3 mm footprint with 1.09-mm height supports ultra-compact layouts in cameras, PDAs, and handheld instruments - no exposed thermal pad required. |
Applications
| Camera Power Management | White LED Backlight Drive |
|---|---|
|
Use Scenario: Boosting 1.8–3.3 V from dual-cell alkaline or Li-ion to 5 V for CCD/CMOS sensor bias and flash charging circuits. IC Role / Device Role / Timing Role: Primary step-up regulator delivering stable 5 V at up to 300 mA with <2.5 µA shutdown current during idle periods. Use Value: Enables extended capture time between battery replacements by maintaining >87% efficiency at 100–500 mA loads and supporting deep-sleep modes. |
Use Scenario: Driving parallel white LEDs in handheld GPS units or PDAs requiring 18–24 V from 3.3 V Li-ion supply. IC Role / Device Role / Timing Role: Adjustable-output boost converter configured for 20 V output with FB divider; regulates LED current via external sense resistor. Use Value: Delivers consistent brightness across battery discharge curve due to 1.24 V precision FB reference and wide input range (0.8–14 V). |
| TFT LCD Panel Supply | Flash Memory Programming |
|
Use Scenario: Generating 12–14 V AVDD for TFT source drivers in palmtop computers operating from single-cell Li-ion (2.7–4.2 V). IC Role / Device Role / Timing Role: High-voltage boost stage with programmable 2 MHz switching to minimize inductor size and board area. Use Value: Achieves compact solution size (<120 mm² total) while maintaining <1% output voltage drift over −40°C to 85°C ambient. |
Use Scenario: Providing 12 V programming voltage for NOR/NAND flash in hand-held test instruments powered by 3.3 V rails. IC Role / Device Role / Timing Role: Precision-adjustable boost converter with 1.24 V reference and ±2.7% FB tolerance ensuring accurate 12.0±0.3 V output. Use Value: Guarantees reliable flash write/erase cycles without overvoltage stress, validated across full temperature and input voltage range. |
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 peak current limit; identical pinout and control architecture; shares same 8-pin VSSOP package. | Better suited for 5 V→12 V conversion at >300 mA loads where LM2623MM/NOPB may approach current limit. | Select LM2622MM/NOPB when peak inductor current exceeds 1.1 A or when driving higher-power white LED strings. |
| LM2733YMF/NOPB | Fixed 500 kHz frequency; 3 A switch; 2.7–5.5 V input range only; different pinout (6-pin SOT-23); no FREQ or SGND pins. | Limited to single-cell Li-ion inputs; lacks programmable frequency and dual-ground architecture - less flexible for multi-battery systems. | Choose LM2733YMF/NOPB only for cost-sensitive, fixed-frequency 3.3 V→5 V boost where board space is extreme constraint. |
Compared with LM2622MM/NOPB, LM2623MM/NOPB trades peak current headroom for lower quiescent current and broader input range; versus LM2733YMF/NOPB, it offers superior flexibility in input voltage, frequency tuning, and thermal management - making it optimal for multi-cell, variable-load portable applications.
Availability
LM2623MM/NOPB is available at Aetrix Electronics and suitable for camera power management, white LED backlight drive, TFT LCD panel supply, flash memory programming, and handheld instrumentation requiring stable component supply with long-term lifecycle support.
Supply support for LM2623MM/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 decades of leadership in power conversion ICs for portable and industrial applications.
The LM2623MM/NOPB belongs to TI's general-purpose boost converter product line, engineered specifically for high-efficiency, low-input-voltage DC-DC conversion in battery-powered consumer electronics - emphasizing small size, wide input range, and robust protection features.
FAQ
What is the minimum input voltage required for LM2623MM/NOPB to start switching?
The LM2623MM/NOPB starts switching at 1.1 V (typical) on the VIN pin, verified across temperature and process corners. Once regulation is achieved, it sustains operation down to 0.8 V input by bootstrapping VDD from the output. This makes LM2623MM/NOPB uniquely capable of powering systems from nearly depleted single-cell alkaline or Li-ion batteries - a key advantage over most competing boost ICs with higher start-up thresholds.
How does the LM2623MM/NOPB achieve high efficiency at light loads?
The LM2623MM/NOPB achieves high light-load efficiency through its gated-oscillator PFM architecture, which skips switching cycles once output regulation is met - reducing switching losses dramatically. Combined with 80 µA typical operating current and <2.5 µA shutdown current, this enables >80% efficiency even at 10 mA output. The LM2623MM/NOPB does not use synchronous rectification or burst-mode control; its efficiency stems from intrinsic low quiescent consumption and adaptive cycle-skipping behavior.
Can the LM2623MM/NOPB be used with a 2-cell Li-ion input (up to 8.4 V)?
Yes, the LM2623MM/NOPB supports input voltages up to 14 V, fully covering the 6–8.4 V range of two-series Li-ion batteries. Its recommended operating conditions specify VIN_OP up to 14 V, and absolute maximum ratings confirm SW pin tolerance to 14.5 V. When used in this configuration, ensure the output voltage is set below 14 V and that thermal design accounts for higher input-to-output differential - particularly at high loads where efficiency drops slightly.
What is the function of the C3 capacitor in LM2623MM/NOPB circuits?
The C3 capacitor in LM2623MM/NOPB circuits exploits a nonlinear effect on the FREQ pin to dynamically adjust duty cycle in response to changing VIN/VOUT ratios - effectively emulating PWM-like behavior within a PFM topology. As C3 value increases, duty cycle rises; decreasing C3 lowers duty cycle. Correct C3 selection is empirical and must be validated via inductor current measurement to avoid premature current-limit triggering or double-pulsing - a documented design requirement unique to the LM2623MM/NOPB family.
Is the LM2623MM/NOPB pin-compatible with other TI boost converters like LM2621 or LM2731?
No, the LM2623MM/NOPB is not pin-compatible with LM2621 or LM2731. It uses an 8-pin VSSOP (DGK) package with dedicated SGND, PGND, FREQ, and BOOT pins - whereas LM2621 uses 8-pin SOIC with different pin assignments, and LM2731 uses 6-pin SOT-23. Pin functions, package dimensions, and thermal pad requirements differ significantly. Substitution requires PCB redesign; only LM2622MM/NOPB shares identical pinout and package with LM2623MM/NOPB.
LM2623MM/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
LM2623MM/NOPB FAQ
1.How can I place an order for LM2623MM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2623MM/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 LM2623MM/NOPB reliable?
The price and inventory of LM2623MM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2623MM/NOPB is usually 5 days.
3.What payment methods are accepted for LM2623MM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2623MM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2623MM/NOPB?
LM2623MM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2623MM/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 LM2623MM/NOPB?
For technical support, including LM2623MM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2623MM/NOPB requirements.
6.How does Aetrix verify that LM2623MM/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2623MM/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 LM2623MM/NOPB meets industry standards.
7.What is the process for return or replacement of LM2623MM/NOPB?
All LM2623MM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2623MM/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 LM2623MM/NOPB part is unused and in its original packaging.
Return procedure for LM2623MM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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