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Texas Instruments LM2622MMX-ADJ/NOPB
- Part No.:
- LM2622MMX-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM2622MMX-ADJ/NOPB.pdf
- Description:
- IC REG BOOST ADJ 1A 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,716
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Product details
Overview
LM2622MMX-ADJ/NOPB from Texas Instruments is a pin-selectable 600 kHz / 1.3 MHz current-mode PWM step-up DC/DC converter with an integrated 1.6 A, 0.2 Ω MOSFET switch, 1.26 V feedback reference, and external compensation (VC) for stable operation with low-ESR ceramic output capacitors. It operates from 2.0 V to 12 V input and supports adjustable output voltages up to 23 V - widely used in TFT display bias supplies requiring multiple regulated and unregulated rails.
For engineers reviewing the LM2622MMX-ADJ/NOPB datasheet, LM2622MMX-ADJ/NOPB pinout, LM2622MMX-ADJ/NOPB application, or LM2622MMX-ADJ/NOPB equivalent, key selection criteria include its dual-frequency selectability (FSLCT pin), thermal shutdown protection, 8-pin VSSOP package footprint, and compatibility with compact 10 µH (600 kHz) or 4.7 µH (1.3 MHz) inductors in portable power designs.
Technical Context
The LM2622MMX-ADJ/NOPB implements peak-current-mode control with internal slope compensation, enabling stable operation above 50% duty cycle when paired with properly sized inductors (≥10 µH at 600 kHz). Its error amplifier features 135 V/V gain and 40–290 µmho transconductance, interfacing directly with the VC pin for custom pole-zero placement via RC/CC network.
Switching frequency is selected by FSLCT: grounded for 600 kHz (±20%), tied to VIN for 1.3 MHz (±25%). The device includes undervoltage lockout (UVP thresholds: 1.7–2.0 V turn-on, 1.7–1.9 V turn-off), overtemperature shutdown, and 85% maximum duty cycle limiting - all critical for reliable boost conversion in battery-powered handheld devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.0 V to 12 V - supports single-cell Li-ion (2.7–3.3 V), alkaline, or NiMH battery inputs without pre-regulation. |
| Output Voltage Range | Adjustable via FB resistor divider - minimum ~1.26 V (direct FB tie), scalable to ≥23 V using charge-pump topologies. |
| Switch Current Limit | 1.0 A to 2.3 A (typ. 1.65 A at VIN = 2.7 V) - sets peak inductor current and defines maximum deliverable load power. |
| Feedback Reference Voltage | 1.2285 V to 1.2915 V (typ. 1.26 V) - determines output accuracy and sets resistor-divider ratio for precise voltage setting. |
| Quiescent Current | 1.3 mA (typ.) in active mode; 5–10 µA in shutdown - enables ultra-low standby power in always-on portable systems. |
| Switch RDS(on) | 0.2 Ω (typ.) at VIN = 2.7 V, ISW = 1 A - minimizes conduction loss and improves efficiency at medium loads (e.g., >100 mA). |
| Thermal Shutdown Threshold | ~150 °C junction temperature - protects IC during overload or poor PCB thermal design without external sensing. |
Pinout & Package
LM2622MMX-ADJ/NOPB is housed in an 8-lead plastic VSSOP (DGK) package (2.3 mm × 2.0 mm, 0.5 mm pitch), optimized for space-constrained portable applications. Thermal performance depends on PCB copper area: θJA ranges from 195 °C/W (with 0.076 in² bottom-layer copper + vias) to 235 °C/W (minimal traces).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Compensation node | Connects to error amplifier output; requires RC/CC network to set dominant pole and zero for loop stability. |
| FB (Pin 2) | Voltage feedback input | Senses divided output voltage; regulates output by maintaining 1.26 V at this pin - defines output setpoint. |
| SHDN (Pin 3) | Shutdown control | Active-low logic input; pulls <0.6 V to disable switching and reduce IQ to ≤10 µA - enables system-level power sequencing. |
| GND (Pin 4) | Analog & power ground | Common return for feedback, compensation, and power paths - must be low-impedance and separated from noisy SW node. |
| SW (Pin 5) | Switch node | Drives external inductor/diode; carries high di/dt pulsed current - requires short, wide trace and local CIN decoupling. |
| VIN (Pin 6) | Power input | Supplies internal bias and gate drive; accepts 2.0–12 V - must be bypassed with ≥10 µF low-ESR capacitor near pin. |
| FSLCT (Pin 7) | Frequency select | Ground = 600 kHz; connect to VIN = 1.3 MHz - selects switching frequency to balance efficiency, size, and EMI. |
| NC (Pin 8) | No-connect | Leave open or tie to GND - shielded from EMI if routed near noise sources; no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable switching frequency | 600 kHz or 1.3 MHz - allows optimization of inductor size (10 µH vs. 4.7 µH) and output capacitor ESR requirements. |
| Integrated 1.6 A / 0.2 Ω power switch | Eliminates external MOSFET and driver, reducing BOM count and layout complexity in compact boost designs. |
| External compensation (VC pin) | Enables full control over loop dynamics using RC/CC network - supports stable operation with ceramic COUT down to 10 µF. |
| Current-mode PWM control | Provides inherent cycle-by-cycle current limiting, fast transient response, and simplified loop compensation vs. voltage-mode. |
| Undervoltage lockout (UVP) | Prevents erratic startup below 1.7–2.0 V - ensures clean enable/disable behavior during battery discharge or brownout. |
| Thermal shutdown protection | Automatically disables switching above ~150 °C junction - prevents permanent damage under sustained overload or poor heatsinking. |
Applications
| TFT Display Bias Supply | Handheld Device Power Rail |
|---|---|
|
Use Scenario: Generating +8 V, −8 V, and +23 V rails from a 2.7–3.3 V Li-ion battery for active-matrix LCD biasing in smartphones and tablets. IC Role / Device Role / Timing Role: Primary step-up controller providing regulated +8 V output while enabling unregulated negative and high-voltage outputs via charge-pump topology. Use Value: Single-chip solution replaces multiple discrete regulators; achieves >80% efficiency at 100 mA load with minimal external components (1 inductor, 2 diodes, 5 caps, 2 resistors). |
Use Scenario: Boosting 2.0–3.3 V battery voltage to 5 V or 8 V for USB peripherals, audio codecs, or sensor interfaces in portable medical or IoT devices. IC Role / Device Role / Timing Role: Adjustable-output DC/DC converter operating in 600 kHz mode for optimal efficiency and low EMI in noise-sensitive analog subsystems. Use Value: Delivers up to 350 mW output power with <2.0 mA quiescent current - extends battery life in always-on monitoring applications. |
| GSM/CDMA Phone RF Front-End | Digital Camera Flash Driver Support |
|
Use Scenario: Providing stable 2.8 V or 3.3 V supply to RF power amplifiers and transceivers in cellular handsets with dynamic load current profiles. IC Role / Device Role / Timing Role: High-transient-response boost regulator using 1.3 MHz switching to minimize output voltage droop during PA burst transmission. Use Value: Maintains <±2% output regulation under 100 mA load steps (10–90%) with <5 µs recovery time - meets GSM spectral mask requirements. |
Use Scenario: Supplying 5–8 V to white LED flash drivers or xenon trigger circuits in compact digital cameras and smartphone camera modules. IC Role / Device Role / Timing Role: Compact, thermally robust boost stage delivering short-duration high-current pulses (up to 1.6 A peak) without thermal throttling. Use Value: Integrated 0.2 Ω switch sustains 1.6 A peak current at 2.7 V input - enables rapid capacitor charging for flash timing consistency. |
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 5-V output (non-adjustable); 1.15 MHz fixed frequency; 0.17 Ω RDS(on); no VC pin for external compensation. | Best suited for fixed-rail applications where output voltage never changes; lacks flexibility for multi-output TFT bias. | Select TPS61040DRVR only when 5 V output suffices and board space is extremely constrained - no resistor-divider or compensation tuning needed. |
| MAX17062ETA+ | 2.5–5.5 V input; 2.5–5.5 V output range; 1.2 MHz switching; integrated soft-start; no FSLCT pin - single frequency only. | Targeted at low-input-voltage systems (e.g., single LiFePO₄ cell); not rated for >12 V input or >23 V outputs. | Choose MAX17062ETA+ for sub-5 V systems requiring guaranteed soft-start and tighter output tolerance (±1.5%), but verify max output voltage compliance. |
Compared with LM2622MMX-ADJ/NOPB, TPS61040DRVR offers lower RDS(on) and smaller solution size but sacrifices adjustability and multi-output capability; MAX17062ETA+ provides superior line/load regulation and built-in soft-start yet lacks frequency selection and high-voltage scalability - making LM2622MMX-ADJ/NOPB uniquely suited for flexible, multi-rail TFT bias designs.
Availability
LM2622MMX-ADJ/NOPB is available at Aetrix Electronics and suitable for TFT display bias supplies, handheld device power rails, and GSM/CDMA phone RF front-end applications requiring stable component supply across long production lifecycles.
Supply support for LM2622MMX-ADJ/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 ICs, with decades of expertise in high-efficiency DC/DC conversion and precision power solutions.
The LM2622 product line was designed specifically for portable display biasing and low-input-voltage boost applications - emphasizing small solution size, wide input range, and robust thermal protection in space- and power-constrained environments.
FAQ
What is the recommended inductor value for LM2622MMX-ADJ/NOPB at 600 kHz operation?
The recommended inductor value for LM2622MMX-ADJ/NOPB at 600 kHz is 10 µH, as specified in TI's SNVS068E datasheet and validated in the triple-output TFT bias reference design (Figure 19). This value ensures stable continuous-conduction-mode operation above 50% duty cycle and avoids right-half-plane zero instability. Using a lower value may cause subharmonic oscillation or excessive ripple.
Can LM2622MMX-ADJ/NOPB generate negative output voltages?
Yes, LM2622MMX-ADJ/NOPB can generate negative outputs - such as −8 V - using an external diode inverter configuration, as demonstrated in the triple-output TFT bias circuit (Figure 19). The IC itself does not produce negative voltage internally; it enables the topology by driving the inductor and SW node, allowing passive charge inversion with Schottky diodes and flying capacitors.
What is the purpose of the VC pin on LM2622MMX-ADJ/NOPB?
The VC pin on LM2622MMX-ADJ/NOPB is the voltage-compensation node connecting to the output of the internal error amplifier. It enables external loop compensation via an RC/CC network to place poles and zeros that stabilize the current-mode control loop - essential for maintaining phase margin with low-ESR ceramic output capacitors and varying load conditions.
Does LM2622MMX-ADJ/NOPB support true shutdown with near-zero current draw?
Yes, LM2622MMX-ADJ/NOPB supports true shutdown: when SHDN is pulled low (<0.6 V), quiescent current drops to 5–10 µA (typ.), effectively disabling switching and minimizing battery drain. This is confirmed in the Electrical Characteristics table (IQ = 5–10 µA, VSHDN = 0 V) and is critical for long-term storage or sleep modes in portable electronics.
How is output voltage adjusted on LM2622MMX-ADJ/NOPB?
Output voltage on LM2622MMX-ADJ/NOPB is adjusted using a resistor divider between VOUT and GND, feeding the FB pin. With a fixed 1.26 V internal reference, VOUT = 1.26 V × (1 + RFB1/RFB2). For example, RFB1 = 40.2 kΩ and RFB2 = 7.5 kΩ yields ~8 V output - values verified in TI's typical application circuit (Figure 19).
LM2622MMX-ADJ/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):
- 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
LM2622MMX-ADJ/NOPB FAQ
1.How can I place an order for LM2622MMX-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2622MMX-ADJ/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 LM2622MMX-ADJ/NOPB reliable?
The price and inventory of LM2622MMX-ADJ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2622MMX-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2622MMX-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2622MMX-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2622MMX-ADJ/NOPB?
LM2622MMX-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2622MMX-ADJ/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 LM2622MMX-ADJ/NOPB?
For technical support, including LM2622MMX-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2622MMX-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2622MMX-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2622MMX-ADJ/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 LM2622MMX-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2622MMX-ADJ/NOPB?
All LM2622MMX-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2622MMX-ADJ/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 LM2622MMX-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2622MMX-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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