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Texas Instruments LM2622MM-ADJ
- Part No.:
- LM2622MM-ADJ
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM2622MM-ADJ.pdf
- Description:
- IC REG BOOST ADJ 1A 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,991
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Product details
Overview
LM2622MM-ADJ from Texas Instruments is a current-mode, pin-selectable-frequency step-up DC/DC converter with an integrated 1.6A/0.2Ω MOSFET switch, 1.26V feedback reference, and external compensation (VC) pin. It operates from 2.0V to 12V input and delivers regulated outputs up to 23V-used in TFT display bias supplies requiring 8V, −8V, and 23V rails.
For engineers reviewing the LM2622MM-ADJ datasheet, LM2622MM-ADJ pinout, LM2622MM-ADJ application, or LM2622MM-ADJ equivalent, key selection criteria include adjustable output via FB resistor divider, 600kHz/1.3MHz frequency select (FSLCT), thermal shutdown, over-temperature protection, and VSSOP-8 package compatibility with compact handheld power designs.
Technical Context
The LM2622MM-ADJ implements peak-current-mode PWM control with dual-loop sensing: internal switch current and output voltage feedback. Its error amplifier features 40–290 µmho transconductance and 135 V/V gain, enabling stable regulation across 2.0–12V input and load currents up to 1.65A (typical switch current limit at VIN = 2.7V).
It supports continuous conduction mode (CCM) operation with duty cycle up to 85%, includes undervoltage lockout (UVP on/off thresholds at 1.82–2.0V / 1.7–1.82V), and integrates over-temperature shutdown. The VC pin allows full customization of loop compensation using RC/CC networks to stabilize against right-half-plane zero effects in boost topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.0V to 12V - supports single-cell Li-ion, NiMH, or 3.3V system rail inputs without pre-regulation. |
| Feedback Reference Voltage | 1.26V (±2.5%) - sets output voltage via external RFB1/RFB2 divider; enables precise adjustment from ~2.5V to >23V. |
| Switch Current Limit | 1.65A (typ) at VIN = 2.7V - defines maximum deliverable output current before foldback; limits peak inductor current. |
| Switching Frequency | 600kHz (FSLCT = GND) or 1.3MHz (FSLCT = VIN) - selectable for EMI filtering trade-offs and inductor size optimization (10µH @ 600kHz, 4.7µH @ 1.3MHz). |
| Internal Switch RDS(on) | 0.2Ω (typ) at VIN = 2.7V - determines conduction loss and thermal rise; enables high efficiency (>85% typical at 8V/100mA). |
| Quiescent Current | 2.0mA (typ) when switching, 5–10µA in shutdown - minimizes battery drain in portable standby modes. |
| Thermal Shutdown Threshold | 150°C junction temperature - protects device under overload or poor PCB heat sinking; auto-recovery on cooldown. |
Pinout & Package
LM2622MM-ADJ is housed in an 8-pin VSSOP (DGK) package - low-profile, surface-mount, with 0.5mm pitch and exposed thermal pad (not electrically connected). Pin 8 is NC and must be grounded or left open per layout guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Compensation network connection | Connects to output of internal error amplifier; accepts RC/CC network to set dominant pole-zero pair for loop stability. |
| FB (Pin 2) | Output voltage feedback input | Senses resistive divider output; regulates VOUT to 1.26V reference; high-impedance (≤20nA bias current) minimizes divider error. |
| SHDN (Pin 3) | Shutdown control input | Active-low logic interface; pulls <0.3V to disable switching and reduce IQ to ≤10µA; threshold defined at 0.6V (max). |
| GND (Pin 4) | Analog and power ground | Common return for feedback, control, and power paths; requires low-impedance PCB plane connection for noise immunity. |
| SW (Pin 5) | Power switch node | Drives external inductor; swings from GND to ~VIN + VOUT during operation; handles 1.6A peak current and 18V max voltage. |
| VIN (Pin 6) | Analog power input | Supplies internal circuitry and gate drive; bypass with ≥10µF ceramic capacitor near pin to suppress ripple and EMI. |
| FSLCT (Pin 7) | Frequency select input | Logic-level input: tie to GND for 600kHz, to VIN for 1.3MHz; configures oscillator without external components. |
| NC (Pin 8) | No-connect terminal | Not internally bonded; recommended to connect to GND plane beneath device or shield from EMI if routing prevents direct grounding. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable switching frequency | 600kHz or 1.3MHz - enables optimization of inductor size, output ripple, and EMI filter complexity without changing IC. |
| External compensation (VC pin) | Full control over loop dynamics via RC/CC network - supports stable operation with low-ESR ceramic capacitors and wide load ranges. |
| Integrated 1.6A/0.2Ω MOSFET switch | Eliminates external switch and driver; reduces BOM count and layout area while maintaining >85% efficiency at moderate loads. |
| Undervoltage lockout (UVP) | Hysteresis-enabled start-up at 1.92V (on) / 1.82V (off) - prevents erratic operation during brown-out or battery discharge. |
| Thermal shutdown with auto-recovery | Triggers at 150°C junction temperature and resumes operation after die cools - protects against sustained overload or poor heatsinking. |
Applications
| TFT Display Bias Supply | Handheld Device Power Rail |
|---|---|
|
Use Scenario: Generating triple-rail bias (8V, −8V, 23V) for active-matrix LCD/TFT panels in portable medical monitors and industrial HMIs. IC Role / Device Role / Timing Role: Primary step-up controller regulating 8V rail; enables charge-pump and inverter stages for unregulated negative and high-voltage rails. Use Value: Single-chip solution replaces discrete boost + inverter + multiplier circuits; reduces component count by >40% and board area by >30%. |
Use Scenario: Boosting 2.7–3.3V battery or system rail to 5V or 8V for USB peripherals, audio codecs, or sensor interfaces in Bluetooth headsets and wearables. IC Role / Device Role / Timing Role: High-efficiency DC/DC converter with shutdown control and low quiescent current for intermittent-load applications. Use Value: Extends battery life via 2.0mA operating IQ and <10µA shutdown current; 600kHz operation balances efficiency and EMI in space-constrained layouts. |
| Digital Camera Flash Driver | GSM/CDMA RF Module Supply |
|
Use Scenario: Providing 23V pulse supply for xenon flash capacitor charging in compact digital cameras and action cams. IC Role / Device Role / Timing Role: High-voltage boost converter operating in discontinuous mode; driven by microcontroller-triggered SHDN pulses. Use Value: Delivers >20V output from 3.3V input using only one inductor and four diodes; avoids need for transformer-based flyback solutions. |
Use Scenario: Generating stable 5V or 8V supply for PA bias, RF synthesizers, or baseband processors in legacy cellular handsets. IC Role / Device Role / Timing Role: Low-noise, thermally robust power stage supporting burst-mode transmission with fast transient response. Use Value: 1.3MHz option minimizes output capacitor size (<22µF) and improves load-step recovery time (<50µs) critical for RF envelope tracking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61040DRVR | Fixed 500kHz frequency; no FSLCT pin; 1.23V FB reference; lower 0.17Ω RDS(on); no UVP. | Lacks pin-selectable frequency and undervoltage lockout; better suited for fixed-frequency, cost-sensitive consumer apps. | Select TPS61040DRVR only when 500kHz operation and absence of UVP are acceptable; not drop-in due to different FB voltage and missing FSLCT. |
| MAX17062ETA+ | 1.225V FB reference; 1.2MHz fixed frequency; integrated soft-start; higher 2.5A switch current limit; no VC pin. | Offers higher current capability and built-in soft-start but lacks external compensation and frequency select flexibility. | Choose MAX17062ETA+ for higher-output-current designs where loop tuning is not required; incompatible pinout and compensation architecture. |
Compared with LM2622MM-ADJ, TPS61040DRVR trades frequency flexibility and UVP for lower RDS(on), while MAX17062ETA+ sacrifices external loop control for higher current and integrated soft-start-neither offers pin-to-pin compatibility or identical feature set.
Availability
LM2622MM-ADJ is available at Aetrix Electronics and suitable for TFT bias supplies, handheld device power rails, digital camera flash drivers, GSM/CDMA RF module supplies, and portable medical instrumentation requiring stable component supply and long-term manufacturability.
Supply support for LM2622MM-ADJ 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 expertise in high-efficiency DC/DC conversion and precision power regulation.
The LM2622 product line was designed specifically for compact, high-voltage boost applications in portable displays and battery-powered systems-emphasizing integration, thermal resilience, and flexible compensation for real-world layout constraints.
FAQ
What is the function of the VC pin on the LM2622MM-ADJ?
The VC pin on the LM2622MM-ADJ connects to the output of the internal error amplifier and serves as the compensation node for the voltage feedback loop. Engineers use an external RC/CC network tied to VC to place a dominant pole and zero, stabilizing the current-mode boost converter against right-half-plane zero effects-critical for reliable operation with ceramic output capacitors and varying load conditions. This design flexibility is integral to the LM2622MM-ADJ's adaptability across diverse power architectures.
Can the LM2622MM-ADJ generate negative output voltages?
Yes-the LM2622MM-ADJ can generate negative outputs such as −8V using an external diode inverter stage, as demonstrated in the triple-output TFT bias reference design. While the LM2622MM-ADJ itself regulates only the positive rail (e.g., +8V), its SW node switching action drives passive charge-pump and inverter circuits that derive complementary negative and high-voltage rails. The LM2622MM-ADJ does not regulate the negative output directly; regulation relies on the primary +8V rail's stability and external component matching.
What is the minimum input voltage required for the LM2622MM-ADJ to start switching?
The LM2622MM-ADJ begins switching when the input voltage reaches the undervoltage lockout (UVP) turn-on threshold of 1.92V (typical), with hysteresis ensuring stable startup. Operation is fully specified down to 2.0V input, and the device maintains regulation across the full 2.0V–12V range. Below 1.82V, the UVP circuit disables switching to prevent erratic behavior-this behavior is inherent to the LM2622MM-ADJ's internal protection architecture and verified across temperature.
How does the FSLCT pin affect the LM2622MM-ADJ's performance?
The FSLCT pin on the LM2622MM-ADJ selects between two fixed switching frequencies: 600kHz (when pulled to GND) or 1.3MHz (when pulled to VIN). This selection directly impacts inductor size (10µH vs. 4.7µH), output capacitor requirements, EMI profile, and light-load efficiency. At 1.3MHz, the LM2622MM-ADJ achieves faster transient response but slightly lower peak efficiency due to increased switching losses-trade-offs confirmed in TI's SNVS068E characterization data.
Is the LM2622MM-ADJ RoHS-compliant and lead-free?
Yes-the LM2622MM-ADJ is manufactured in a RoHS-compliant, lead-free process and meets JEDEC J-STD-020 moisture sensitivity level 2a (MSL-2a) requirements. Texas Instruments' official packaging documentation confirms Pb-free terminations and halogen-free molding compounds for the VSSOP-8 (DGK) package used by the LM2622MM-ADJ, aligning with global environmental compliance standards for commercial and industrial applications.
LM2622MM-ADJ 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):
- 2V
- Voltage - Input (Max):
- 12V
- Voltage - Output (Min/Fixed):
- 1.26V
- Voltage - Output (Max):
- 12V
- Current - Output:
- 1A (Switch)
- Frequency - Switching:
- 600kHz, 1.3MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
LM2622MM-ADJ FAQ
1.How can I place an order for LM2622MM-ADJ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2622MM-ADJ 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 LM2622MM-ADJ reliable?
The price and inventory of LM2622MM-ADJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2622MM-ADJ is usually 5 days.
3.What payment methods are accepted for LM2622MM-ADJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2622MM-ADJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2622MM-ADJ?
LM2622MM-ADJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2622MM-ADJ 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 LM2622MM-ADJ?
For technical support, including LM2622MM-ADJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2622MM-ADJ requirements.
6.How does Aetrix verify that LM2622MM-ADJ is sourced from the original manufacturer or authorized distributors?
All LM2622MM-ADJ 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 LM2622MM-ADJ meets industry standards.
7.What is the process for return or replacement of LM2622MM-ADJ?
All LM2622MM-ADJ units undergo pre-shipment inspection (PSI). If there is an issue with LM2622MM-ADJ, 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 LM2622MM-ADJ part is unused and in its original packaging.
Return procedure for LM2622MM-ADJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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