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Texas Instruments LM2623AMM
- Part No.:
- LM2623AMM
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM2623AMM.pdf
- Description:
- IC REG BOOST ADJ 2.2A 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,071
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Product details
Overview
LM2623AMM 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 MHz switching frequency, features 0.17 Ω internal N-channel MOSFET, and achieves up to 90% efficiency in handheld power management applications.
For engineers reviewing the LM2623AMM datasheet, LM2623AMM pinout, LM2623AMM application, or LM2623AMM equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters (including 1.1 V start-up, 80 µA quiescent current, and 2.85 A peak switch current limit), and real-world implementation guidance for battery-powered step-up regulation.
Technical Context
The LM2623AMM implements a pulse-frequency-modulated (PFM) gated-oscillator control scheme with cycle-by-cycle current limiting and thermal shutdown. Its oscillator frequency (300 kHz–2 MHz) is resistor-programmable via the FREQ pin, while duty cycle adaptability is enabled by external C3 capacitor coupling - enabling ratio-adaptive regulation across varying VIN/VOUT conditions.
It integrates an N-channel MOSFET switch (RDS(on) = 0.17 Ω typ), bootstrap gate drive (BOOT pin), dual ground separation (PGND and SGND), and precision 1.24 V feedback reference (FB pin). Startup occurs at 1.1 V, and operation sustains down to 0.8 V via VDD bootstrapping from regulated output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 0.8 V to 14 V - supports single- to quad-cell alkaline and 1–3-cell Li-ion battery inputs 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 resistive divider on FB pin; 1.24 V reference ensures ±2.2% accuracy over temperature. |
| Switching frequency | 300 kHz to 2 MHz - set by resistor on FREQ pin; higher frequencies allow smaller magnetics and compact PCB layout. |
| Peak switch current limit | 2.85 A (typ) - protects internal MOSFET during overload or short-circuit; prevents thermal runaway in high-current boost stages. |
| Quiescent current | 80 µA (typ) - minimizes standby power loss in always-on subsystems like camera flash or sensor bias rails. |
| Shutdown current | <2.5 µA - extends battery life in sleep modes of pagers, GPS units, and handheld instruments. |
| MOSFET RDS(on) | 0.17 Ω (typ) - reduces conduction loss at high load currents, supporting up to 2 A output at low VOUT. |
Pinout & Package
LM2623AMM is housed in an 8-pin VSSOP package (3.00 mm × 3.00 mm, 1.09 mm height), optimized for space-constrained portable designs. The package includes exposed thermal pad (DAP) for enhanced heat dissipation when soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Unbonded die pad; must be left floating or tied to GND per layout guidelines - no electrical function. |
| 2 (EN) | Active-Low Enable | Logic input: below 0.15×VDD forces shutdown; above 0.7×VDD enables regulation - supports host-controlled power sequencing. |
| 3 (PGND) | Power Ground | High-current return path for MOSFET switch and Schottky diode; must be low-inductance connection to minimize SW node ringing. |
| 4 (FB) | Voltage Feedback Input | Monitors output via resistive divider; internal 1.24 V reference sets regulation point - determines final VOUT accuracy. |
| 5 (FREQ) | Frequency Programming | Analog input for external resistor; sets oscillator frequency and influences duty cycle behavior - enables EMI optimization and size reduction. |
| 6 (SGND) | Signal Ground | Reference for FB, EN, FREQ, and VDD circuits; isolated from PGND to prevent noise coupling into sensitive analog nodes. |
| 7 (VDD) | Internal Supply Rail | 3–5 V supply for control circuitry; bootstrapped from output during operation - eliminates need for auxiliary bias supply. |
| 8 (SW) | Switch Node | Drain of internal N-MOSFET; connects to inductor and Schottky anode - carries high di/dt pulses requiring tight layout and low parasitic inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Gated-oscillator PFM control | Delivers >87% efficiency across 10 mA–500 mA loads without external compensation - ideal for variable-load battery systems. |
| Dual ground separation (PGND/SGND) | Reduces noise coupling between high-current switching paths and precision feedback circuitry - improves output voltage stability and ripple performance. |
| Programmable frequency & adaptive duty cycle | Enables optimization for EMI, size, and efficiency: e.g., 2 MHz operation allows 2.2 µH inductors and 10 µF ceramic output caps in <100 mm² footprint. |
| Integrated 0.17 Ω N-MOSFET | Eliminates external high-side switch and associated gate driver - reduces BOM count, layout complexity, and thermal hotspots. |
| Thermal shutdown & cycle-by-cycle current limit | Protects against sustained overloads and PCB-level thermal failures - triggers at ~160°C junction temp and resets at ~135°C. |
| 1.1 V start-up capability | Permits operation from weak or aging batteries in legacy alkaline-powered devices - avoids premature system shutdown. |
Applications
| Camera Flash Power Supply | Handheld GPS Receiver Bias |
|---|---|
|
Use Scenario: Boosting 2-cell alkaline (2.4 V nominal) to 5 V for xenon flash capacitor charging in digital cameras. IC Role / Device Role / Timing Role: Primary step-up regulator with programmable frequency to minimize EMI near RF front-end; EN pin synchronized to shutter trigger. Use Value: 2.85 A peak current limit safely handles flash charge surges; 80 µA quiescent current preserves battery during standby between shots. |
Use Scenario: Generating stable 3.3 V rail from 1–2 cell Li-ion (3.0–4.2 V) for GPS baseband processor and RF transceiver. IC Role / Device Role / Timing Role: Efficient mid-range boost converter; FREQ pin adjusted to 1.2 MHz to avoid GPS L1 band interference (1.575 GHz). Use Value: Dual ground isolation (PGND/SGND) prevents switching noise from corrupting GPS signal integrity and position lock time. |
| TFT LCD Backlight Driver | Flash Memory Programming Voltage |
|
Use Scenario: Providing 12 V from 3.3 V system rail to drive white LED strings in portable medical display panels. IC Role / Device Role / Timing Role: Adjustable-output boost controller; FB divider configured for 12 V; C3 capacitor tuned for minimal output ripple at 100 Hz PWM dimming. Use Value: 1.24 V reference tolerance (±2.2%) ensures consistent LED brightness across temperature; 90% efficiency limits thermal rise in sealed enclosures. |
Use Scenario: Generating 12 V programming voltage for NAND/NOR flash memory in industrial data loggers powered by 2-cell Li-ion. IC Role / Device Role / Timing Role: High-accuracy boost source; FB pin referenced to internal 1.24 V bandgap - maintains ±1% VPROG over full temperature range. Use Value: Shutdown current <2.5 µA prevents battery drain during long-term storage; thermal protection avoids damage during extended write cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2622MM | Lower peak current limit (1.2 A vs 2.85 A); identical 8-pin VSSOP footprint and pinout. | Suited for ≤500 mA loads (e.g., low-power sensors); not recommended for flash or high-brightness LED drivers. | Select LM2622MM only when output current demand is ≤0.6 A and cost sensitivity outweighs headroom requirements. |
| LM2731YMF | Higher 1.6 MHz fixed frequency; 0.55 Ω RDS(on); requires external MOSFET; SOT-23-5 package. | Better suited for ultra-compact, low-cost designs where 1 A max output suffices and board area is critical. | Choose LM2731YMF when footprint minimization is primary and integrated switch is not required - but expect lower efficiency at >300 mA. |
Compared with LM2623AMM, LM2622MM offers identical integration and layout compatibility but reduced current capability, while LM2731YMF trades integration for smaller size and fixed-frequency predictability - making LM2623AMM optimal for 1–2 A, battery-fed boost applications demanding both efficiency and reliability.
Availability
LM2623AMM is available at Aetrix Electronics and suitable for camera flash power supplies, handheld GPS receivers, TFT LCD backlight drivers, and flash memory programming circuits requiring stable component supply, long-lifecycle support, and TI-qualified production-grade silicon.
Supply support for LM2623AMM 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 LM2623AMM belongs to TI's general-purpose DC-DC boost converter product line, engineered specifically for low-voltage, high-efficiency step-up regulation in portable consumer and industrial electronics.
FAQ
What is the minimum input voltage required for LM2623AMM to start switching?
The LM2623AMM starts switching at 1.1 V (typical) on the VDD pin. Once regulation is achieved, it continues operating down to 0.8 V input due to bootstrapping from the output through the VDD pin. This behavior is confirmed in Section 6.5 (Electrical Characteristics) and Section 7.4.2 (Low Voltage Start-Up) of the official SNVS188I datasheet.
Can LM2623AMM replace LM2622AMM in an existing design?
LM2623AMM is not a direct drop-in replacement for LM2622AMM due to its higher 2.85 A peak current limit (vs 1.2 A), different internal current-sense threshold, and distinct C3 capacitor tuning requirements for duty cycle control. Layout may remain compatible, but FB divider, inductor, and output capacitor must be re-validated per LM2623AMM's higher current capability and PFM behavior.
What is the purpose of the separate PGND and SGND pins on LM2623AMM?
PGND (Pin 3) carries high pulsed currents from the internal MOSFET and Schottky diode, while SGND (Pin 6) serves as the quiet reference for FB, EN, FREQ, and VDD circuits. Separating these grounds minimizes noise coupling - a design requirement explicitly called out in Section 10.1 (Layout Guidelines) to maintain output voltage accuracy and stability.
How is the switching frequency set on LM2623AMM?
Switching frequency is set by connecting an external resistor between VIN and the FREQ pin (Pin 5). Values from 121 kΩ (2 MHz) to 1 MΩ (300 kHz) are supported, as shown in Figure 3 (Frequency vs VIN) of the datasheet. Frequency selection directly impacts inductor size, output ripple, and EMI profile - no capacitor is required for basic frequency setting.
Does LM2623AMM include thermal protection?
Yes, LM2623AMM includes an internal thermal protection circuit that disables the MOSFET switch when junction temperature exceeds approximately 160°C. Operation resumes automatically when temperature falls below ~135°C. This feature is documented in Section 7.3.4 (Internal Current Limit And Thermal Protection) and Section 6.4 (Thermal Information) of the SNVS188I datasheet.
LM2623AMM 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:
- Obsolete
- 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 FAQ
1.How can I place an order for LM2623AMM through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2623AMM 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 reliable?
The price and inventory of LM2623AMM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2623AMM is usually 5 days.
3.What payment methods are accepted for LM2623AMM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2623AMM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2623AMM?
LM2623AMM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2623AMM 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?
For technical support, including LM2623AMM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2623AMM requirements.
6.How does Aetrix verify that LM2623AMM is sourced from the original manufacturer or authorized distributors?
All LM2623AMM 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 meets industry standards.
7.What is the process for return or replacement of LM2623AMM?
All LM2623AMM units undergo pre-shipment inspection (PSI). If there is an issue with LM2623AMM, 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 part is unused and in its original packaging.
Return procedure for LM2623AMM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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