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Texas Instruments LM2622MM-ADJ/NOPB
- Part No.:
- LM2622MM-ADJ/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM2622MM-ADJ/NOPB.pdf
- Description:
- IC REG BOOST ADJ 1A 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,431
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Product details
Overview
LM2622MM-ADJ/NOPB from Texas Instruments is a pin-selectable 600 kHz / 1.3 MHz current-mode PWM step-up DC/DC converter with a 1.6 A, 0.2 Ω internal MOSFET switch, 1.26 V feedback reference, and adjustable output voltage via external resistor divider. It operates from 2.0 V to 12 V input and delivers stable bias supplies for TFT displays in portable electronics.
For engineers reviewing the LM2622MM-ADJ/NOPB datasheet, LM2622MM-ADJ/NOPB pinout, LM2622MM-ADJ/NOPB application, or LM2622MM-ADJ/NOPB equivalent, key selection criteria include its dual-frequency selectability (FSLCT pin), VC compensation flexibility, thermal shutdown protection, and VSSOP-8 package compatibility with space-constrained handheld designs.
Technical Context
The LM2622MM-ADJ/NOPB implements peak-current-mode control with an internal 1.6 A/0.2 Ω N-channel MOSFET switch and a dedicated VC pin for external loop compensation. Its error amplifier features 135 V/V gain and 40–290 µmho transconductance, enabling stable regulation across wide load and input ranges.
Switching frequency is selected via FSLCT pin: grounded for 600 kHz (±20%), tied to VIN for 1.3 MHz (±25%). The device includes over-temperature protection, undervoltage lockout (UVP on/off thresholds at 1.82–2.0 V / 1.7–1.9 V), and 78–85% maximum duty cycle limiting.
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) and multi-cell alkaline inputs without pre-regulation. |
| Feedback Reference Voltage | 1.26 V (±2.4%) - sets output voltage via RFB1/RFB2 divider; enables precise adjustment from ~2.5 V to >23 V. |
| Switch Current Limit | 1.65 A typical at VIN = 2.7 V - defines maximum deliverable output power before foldback; limits peak inductor current. |
| Switch RDS(on) | 0.2 Ω typical at VIN = 2.7 V, ISW = 1 A - determines conduction loss and thermal rise under load; enables high efficiency at low input voltages. |
| Quiescent Current | 2.0 mA typical (FB = 0 V, not switching) - defines no-load power draw; critical for battery runtime in always-on bias rails. |
| Thermal Shutdown Threshold | 150°C junction temperature - protects against sustained overload or poor PCB thermal design; auto-recovery after cooldown. |
| Operating Junction Temp | −40°C to +125°C - qualified for industrial and automotive cabin-ambient environments without derating. |
Pinout & Package
LM2622MM-ADJ/NOPB is housed in an 8-pin VSSOP (DGK) package - 3.0 mm × 3.0 mm × 1.0 mm body, 0.65 mm pitch - optimized for compact portable layouts with exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VC (Pin 1) | Compensation network connection | Connects to output of internal error amplifier; RC/CC network here sets dominant pole-zero pair for loop stability. |
| FB (Pin 2) | Output voltage feedback input | Senses resistive divider output; regulates VOUT by maintaining 1.26 V at this pin; high-impedance (≤20 nA bias). |
| SHDN (Pin 3) | Shutdown control input | Active-low enable; pulls <0.6 V to disable switching and reduce IQ to 5–10 µA; open-drain compatible with logic-level control. |
| GND (Pin 4) | Analog and power ground | Common return for feedback, control, and power paths; requires low-impedance PCB plane connection to minimize noise coupling. |
| SW (Pin 5) | Power switch node | Drives external inductor; swings from GND to up to 18 V; high di/dt node requiring short, wide traces and local bypassing. |
| VIN (Pin 6) | Analog power input | Supplies internal circuitry and gate drive; must be decoupled with ≥10 µF ceramic capacitor placed adjacent to pin. |
| FSLCT (Pin 7) | Frequency select input | Ground = 600 kHz operation; connect to VIN = 1.3 MHz; selects trade-off between EMI filtering ease and component size. |
| NC (Pin 8) | No-connect terminal | Not internally bonded; recommended to tie directly to GND plane beneath device or shield from EMI if left floating. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-selectable switching frequency | 600 kHz or 1.3 MHz via single FSLCT pin - enables layout optimization: lower frequency for easier EMI filtering, higher frequency for smaller L/C components. |
| Internal 1.6 A, 0.2 Ω MOSFET | Eliminates external switch and driver; reduces BOM count and board area while delivering >85% efficiency at 3.3 V → 8 V conversion. |
| Adjustable output via resistor divider | 1.26 V reference allows precise VOUT setting from 2.5 V to 23 V - supports triple-output TFT bias (e.g., +8 V, −8 V, +23 V) without additional ICs. |
| External compensation (VC pin) | Enables full control over loop dynamics using RC/CC network - accommodates varied output capacitance (ceramic, polymer, tantalum) and load transient requirements. |
| Integrated protection functions | Includes thermal shutdown, undervoltage lockout (UVP), and current limit - ensures robust operation during cold start, brownout, or short-circuit events. |
Applications
| TFT Display Bias Supply | Handheld Device Power Management |
|---|---|
|
Use Scenario: Generating regulated +8 V, unregulated −8 V, and +23 V rails for active-matrix LCD/TFT panel gate/source drivers. IC Role / Device Role / Timing Role: Primary step-up controller managing all three outputs from a single 2.7–3.3 V battery source; FSLCT set to 600 kHz for optimal ripple/noise balance. Use Value: Eliminates need for multiple discrete converters; achieves >82% efficiency at 100 mA load per rail with minimal external components (1 inductor, 4 diodes, 7 caps, 2 resistors). |
Use Scenario: Providing stable 5 V or 8 V auxiliary supply from a single Li-ion cell in Bluetooth headsets or portable medical sensors. IC Role / Device Role / Timing Role: High-efficiency boost regulator operating in discontinuous conduction mode at light loads; SHDN pin enables microcontroller-controlled power gating. Use Value: Delivers 150 mA at 8 V from 2.8 V input with <2.0 mA quiescent current in shutdown - extends battery life beyond 72 hours in sleep mode. |
| GSM/CDMA Phone RF Front-End | Digital Camera Flash Charging |
|
Use Scenario: Supplying 2.8 V bias to PA driver stages and 5 V to RF transceiver ICs in dual-band cellular handsets. IC Role / Device Role / Timing Role: Dual-rail generator using split feedback networks; FSLCT set to 1.3 MHz to minimize inductor size (<4.7 µH) and meet tight PCB height constraints. Use Value: Maintains ±2% output regulation across 10–200 mA load steps; VC compensation ensures <50 µs recovery time from 50% load transients. |
Use Scenario: Charging high-voltage capacitor (300–400 V) for xenon flash tubes in compact digital cameras. IC Role / Device Role / Timing Role: First-stage boost converter stepping 3.3 V battery to intermediate 8 V rail; feeds charge-pump multiplier stage; operates at 600 kHz for low EMI near image sensor. Use Value: Enables full flash capacitor charge in <1.2 s using only 10 µH inductor and 22 µF ceramic output cap - no audible coil whine due to fixed-frequency operation. |
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 28 V output; no FB pin; 1.15 MHz fixed frequency; 0.5 A switch; no VC pin. | Only suitable for fixed-output applications; lacks adjustability and compensation control needed for multi-rail TFT bias. | Select LM2622MM-ADJ/NOPB when output voltage tuning, thermal management, or custom loop response is required. |
| MAX17062ETA+ | 1.2 MHz fixed frequency; 2 A switch; integrated soft-start; no FSLCT or VC pins; 2.5 V min input. | Better suited for high-current single-output rails; lacks pin-selectable frequency and external compensation flexibility. | Choose LM2622MM-ADJ/NOPB for designs needing frequency trade-offs, ultra-low input operation (2.0 V), or precision stability tuning. |
Compared with TPS61040DRVR and MAX17062ETA+, the LM2622MM-ADJ/NOPB uniquely combines pin-selectable frequency, adjustable output, and full external compensation - making it the only option among the three capable of stable triple-output TFT bias generation with minimal external parts.
Availability
LM2622MM-ADJ/NOPB is available at Aetrix Electronics and suitable for TFT display bias supplies, handheld device power management, and GSM/CDMA phone RF front-end applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2622MM-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 portable power solutions.
The LM2622 product line was designed specifically for compact, high-efficiency boost conversion in battery-powered visual interfaces - emphasizing low-input-voltage operation, flexible output configuration, and robust thermal behavior in thin-profile packages.
FAQ
What is the minimum input voltage supported by the LM2622MM-ADJ/NOPB?
The LM2622MM-ADJ/NOPB supports a minimum input voltage of 2.0 V, verified across the full operating temperature range (−40°C to +125°C). This enables direct operation from partially discharged single-cell Li-ion batteries or two-series alkaline cells, making the LM2622MM-ADJ/NOPB suitable for deep-discharge portable applications where input may dip below 2.5 V.
How does the FSLCT pin affect switching frequency in the LM2622MM-ADJ/NOPB?
The FSLCT pin on the LM2622MM-ADJ/NOPB selects between two fixed frequencies: grounding the pin configures 600 kHz operation (typical 600 kHz, range 480–720 kHz), while connecting it to VIN selects 1.3 MHz (typical 1.3 MHz, range 1.0–1.5 MHz). This pin does not support analog or variable-frequency control - it is strictly a binary selection for optimizing inductor size versus EMI filter complexity.
Can the LM2622MM-ADJ/NOPB generate negative output voltages?
Yes - the LM2622MM-ADJ/NOPB can generate negative outputs such as −8 V using external diode-capacitor charge-pump topologies, as demonstrated in the official triple-output TFT bias reference design (Figure 19). The IC itself provides only positive step-up conversion, but its SW node and timing control enable reliable inverter and cascade charge-pump stages without additional controllers.
What is the purpose of the VC pin on the LM2622MM-ADJ/NOPB?
The VC pin on the LM2622MM-ADJ/NOPB connects to the output of the internal error amplifier and serves as the point for external compensation network attachment (typically RC and CC in series). This allows designers to tailor loop stability, phase margin, and transient response for specific output capacitors (e.g., ceramic vs. polymer) and load conditions - a capability absent in fixed-compensation boost ICs.
Does the LM2622MM-ADJ/NOPB include thermal protection?
Yes - the LM2622MM-ADJ/NOPB integrates thermal shutdown protection that disables switching when the junction temperature reaches approximately 150°C. Operation resumes automatically once the die cools below the hysteresis threshold (~140°C). This protection is independent of ambient temperature and load current, ensuring reliability under sustained overload or inadequate PCB heat sinking.
LM2622MM-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
LM2622MM-ADJ/NOPB FAQ
1.How can I place an order for LM2622MM-ADJ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2622MM-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 LM2622MM-ADJ/NOPB reliable?
The price and inventory of LM2622MM-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 LM2622MM-ADJ/NOPB is usually 5 days.
3.What payment methods are accepted for LM2622MM-ADJ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2622MM-ADJ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2622MM-ADJ/NOPB?
LM2622MM-ADJ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2622MM-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 LM2622MM-ADJ/NOPB?
For technical support, including LM2622MM-ADJ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2622MM-ADJ/NOPB requirements.
6.How does Aetrix verify that LM2622MM-ADJ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2622MM-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 LM2622MM-ADJ/NOPB meets industry standards.
7.What is the process for return or replacement of LM2622MM-ADJ/NOPB?
All LM2622MM-ADJ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2622MM-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 LM2622MM-ADJ/NOPB part is unused and in its original packaging.
Return procedure for LM2622MM-ADJ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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