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Texas Instruments LM2621MM/NOPB
- Part No.:
- LM2621MM/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM2621MM/NOPB.pdf
- Description:
- IC REG BST SEPIC ADJ 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:979
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Product details
Overview
LM2621MM/NOPB from Texas Instruments is a high-efficiency, low-input-voltage step-up DC-DC converter IC with an integrated 0.17-Ω N-channel MOSFET power switch. It operates from 1.2 V to 14 V input and delivers adjustable regulated output from 1.24 V to 14 V at up to 1 A load current, achieving up to 90% efficiency in handheld battery-powered systems such as PDAs and cellular phones.
For engineers reviewing the LM2621MM/NOPB datasheet, LM2621MM/NOPB pinout, LM2621MM/NOPB application, or LM2621MM/NOPB equivalent, key selection considerations include its gated-oscillator topology for ultra-low quiescent current (80 µA typical), shutdown supply current (<2.5 µA), 300 kHz–2 MHz programmable switching frequency, and VSSOP-8 package compatibility with space-constrained portable designs.
Technical Context
The LM2621MM/NOPB implements a constant-duty-cycle gated oscillator control scheme with 70% fixed on-time, using hysteresis-based regulation (30 mV window) to maintain output voltage without continuous PWM. Its internal N-channel MOSFET switch enables self-bootstrapped operation when VOUT is 2.5–5.0 V, reducing external bias requirements.
Startup capability begins at 1.1 V input, and operational input range extends down to 0.65 V once running. Thermal protection disables the switch above ~160°C junction temperature, and cycle-by-cycle peak current limiting is set at 2.85 A typical to safeguard against overload and short-circuit conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.2 V to 14 V - supports single-cell Li-ion, two/three alkaline/NiMH, and wide industrial input sources |
| Output Voltage Range | 1.24 V to 14 V - adjustable via external resistor divider; FB pin reference is 1.24 V ±2.2% |
| Switching Frequency | 300 kHz to 2 MHz - set by external resistor on FREQ pin; enables use of sub-10-mm surface-mount inductors |
| Peak Switch Current Limit | 2.85 A typical - provides overcurrent protection without requiring external sensing components |
| Quiescent Current | 80 µA typical - enables extended battery standby time in always-on portable devices |
| Shutdown Current | <2.5 µA - reduces system leakage during sleep modes; EN pin active-low logic control |
| Efficiency | 87% at 3.6 VIN/5 VOUT/500 mA - achieved using BiCMOS process and low-RDS(on) 0.17-Ω internal MOSFET |
| Operating Temperature | –40°C to +85°C - qualified for commercial and industrial portable equipment environments |
Pinout & Package
VSSOP-8 (DGK) package: 3.00 mm × 3.00 mm body, 1.09 mm height, 0.5 mm lead pitch - occupies half the PCB area of standard SOIC-8 and supports ultra-thin mobile designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND (Pin 1) | Power Ground | High-current return path for MOSFET switch; must be connected to low-impedance ground plane near SW and BOOT |
| EN (Pin 2) | Active-Low Enable | Pulls below 0.15×VDD to enter shutdown; pulls above 0.7×VDD to enable regulation |
| FREQ (Pin 3) | Frequency Adjust | Resistor-to-VDD sets oscillator frequency; open circuit defaults to ~300 kHz |
| FB (Pin 4) | Voltage Feedback | Monitors output via resistive divider; 1.24 V reference triggers hysteresis-based gated oscillation |
| SGND (Pin 5) | Signal Ground | Low-noise reference for FB, EN, and FREQ; isolated from PGND to prevent feedback corruption |
| VDD (Pin 6) | Internal Bias Supply | Accepts 2.5–5 V; can be bootstrapped from VOUT or supplied externally for non-5 V outputs |
| BOOT (Pin 7) | Bootstrap Capacitor Terminal | Drives gate of internal MOSFET; requires 10–22 nF ceramic capacitor between BOOT and SW |
| SW (Pin 8) | Switch Node | Drain of internal N-MOSFET; connects to inductor and bootstrap capacitor; high dv/dt node requiring tight layout |
Key Features
| Feature | Design Value |
|---|---|
| Gated Oscillator Topology | Delivers 80 µA quiescent current and >87% efficiency across 10 µA–1 A load range without external compensation |
| Integrated 0.17-Ω N-Channel MOSFET | Eliminates external high-side switch and associated gate drive complexity; reduces BOM count and footprint |
| 1.1-V Minimum Start-Up Voltage | Enables operation from nearly-dead batteries; sustains regulation down to 0.65 V after startup |
| Programmable 300 kHz–2 MHz Switching | Allows optimization of inductor size vs. efficiency; 2 MHz operation fits <3 mm² total solution area |
| Thermal & Current Protection | Auto-recovering thermal shutdown (~160°C trip) and cycle-by-cycle current limit (2.85 A typical) ensure robust field reliability |
| VSSOP-8 Low-Profile Package | 3.0 mm × 3.0 mm × 1.09 mm footprint enables integration into slim handhelds, memory cards, and GPS modules |
Applications
| Handheld GPS Receivers | Flash Memory Programming Circuits |
|---|---|
Use Scenario: Powering GPS RF front-end and baseband ICs from single-cell lithium polymer battery (2.7–4.2 V). IC Role / Device Role / Timing Role: Step-up regulator generating stable 3.3 V or 5 V rail for sensitive analog/RF sections and digital logic. Use Value: 87% efficiency at 200 mA preserves battery runtime; <2.5 µA shutdown current prevents drain during satellite acquisition standby. | Use Scenario: Providing 12 V programming voltage for NAND/NOR flash memory in embedded test fixtures and card readers. IC Role / Device Role / Timing Role: Boost converter generating precise, ripple-controlled high-voltage rail from 3.3 V system supply. Use Value: Adjustable output up to 14 V meets flash VPP requirements; gated oscillator minimizes noise coupling into data lines during write cycles. |
| TFT-LCD Bias Supplies | PCMCIA/CardBus Power Management |
Use Scenario: Generating AVDD (10–12 V) and VGH (15–20 V) rails for small-format TFT displays in palmtop computers and medical handhelds. IC Role / Device Role / Timing Role: Primary boost stage feeding charge-pump or LDO post-regulators for display voltage domains. Use Value: 1.24 V feedback reference enables accurate output setting; 2 MHz switching allows miniature 4.7 µH inductors to fit tight bezel margins. | Use Scenario: Converting 3.3 V CardBus supply to 5 V required by legacy PCMCIA peripherals in industrial data loggers. IC Role / Device Role / Timing Role: Compact, low-noise DC-DC converter meeting PCMCIA 5 V ±5% tolerance and transient response specs. Use Value: VSSOP-8 package fits within 54 mm × 43 mm PCMCIA Type II form factor; 70% fixed duty cycle ensures predictable transient behavior during card insertion. |
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 |
|---|---|---|---|
| TPS61022DRCT | Higher 2.5-A switch current limit; 0.55-V minimum start-up; integrated soft-start; 2.5-MHz max frequency | Better suited for higher-current loads (>700 mA) and ultra-low-input scenarios (coin cell) | Select TPS61022DRCT when >1 A output or sub-1-V start-up is required; not pin-compatible with LM2621MM/NOPB |
| MAX17062ETA+ | Fixed 5-V output; 1.8-V min input; 1.2-MHz fixed frequency; smaller 2 mm × 2 mm TDFN package | Optimized for cost-sensitive, fixed-output consumer applications with minimal external components | Select MAX17062ETA+ for simplified 5-V-only designs where adjustability and wide VIN range are unnecessary |
Compared with TPS61022DRCT and MAX17062ETA+, the LM2621MM/NOPB offers broader output adjustability (1.24–14 V), lower quiescent current (80 µA vs. 100 µA), and proven thermal robustness in compact VSSOP-8 - making it optimal for multi-rail, battery-life-critical portable systems where design flexibility outweighs fixed-feature simplification.
Availability
LM2621MM/NOPB is available at Aetrix Electronics and suitable for handheld instrumentation, GPS receivers, and flash programming systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2621MM/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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The LM2621MM/NOPB belongs to TI's low-input-voltage DC-DC converter product line, engineered specifically for space- and power-constrained portable devices needing high efficiency across wide load ranges without external MOSFETs or complex compensation.
FAQ
What is the minimum input voltage required to start up the LM2621MM/NOPB?
The LM2621MM/NOPB starts up from as low as 1.1 V input under no-load conditions. Once started, it continues regulating down to 0.65 V input due to bootstrapped VDD operation. This capability allows reliable operation from nearly depleted single-cell batteries, making LM2621MM/NOPB ideal for long-life portable applications where deep discharge tolerance is critical.
How does the gated oscillator control scheme in the LM2621MM/NOPB improve light-load efficiency?
The LM2621MM/NOPB uses a hysteresis-based gated oscillator that stops switching entirely when output voltage reaches the upper threshold (1.24 V + 15 mV), eliminating switching losses during idle periods. This results in 80 µA typical operating current and >85% efficiency even at 100 µA loads - significantly outperforming conventional PWM regulators in battery standby modes. The LM2621MM/NOPB thus extends usable battery life in intermittently active devices like pagers and memory cards.
Can the LM2621MM/NOPB generate a 12-V output from a 3.3-V input?
Yes, the LM2621MM/NOPB supports output voltages up to 14 V, including 12 V, using an external feedback resistor divider. With VFB = 1.24 V, a standard divider (e.g., 150 kΩ + 13.7 kΩ) sets 12 V output. The device maintains regulation at 12 V with up to 1 A load when input is ≥3.3 V, provided thermal design accommodates power dissipation - confirming LM2621MM/NOPB suitability for TFT-LCD bias and flash programming applications.
What is the purpose of separate PGND and SGND pins on the LM2621MM/NOPB?
The LM2621MM/NOPB separates PGND (Pin 1) for high-current MOSFET return and SGND (Pin 5) for low-noise analog reference to prevent switching noise from corrupting the 1.24 V feedback comparator. PGND must connect directly to the inductor and output capacitor ground plane, while SGND ties only to FB, EN, and FREQ traces. This isolation ensures stable regulation and prevents false shutdown or output drift - a critical layout requirement explicitly validated in LM2621MM/NOPB application notes.
Is the LM2621MM/NOPB RoHS compliant and lead-free?
Yes, the LM2621MM/NOPB is RoHS compliant and lead-free, as indicated by the "/NOPB" suffix in its orderable part number. Texas Instruments certifies this variant meets JEDEC J-STD-020 moisture sensitivity level 2a and qualifies for lead-free reflow soldering per IPC/JEDEC J-STD-020. Full compliance documentation, including material declarations and test reports, is accessible via TI's official product page for LM2621MM/NOPB.
LM2621MM/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, Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Boost, SEPIC
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.2V
- Voltage - Input (Max):
- 14V
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 14V
- Current - Output:
- 2.85A (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
LM2621MM/NOPB FAQ
1.How can I place an order for LM2621MM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2621MM/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 LM2621MM/NOPB reliable?
The price and inventory of LM2621MM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2621MM/NOPB is usually 5 days.
3.What payment methods are accepted for LM2621MM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2621MM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2621MM/NOPB?
LM2621MM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2621MM/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 LM2621MM/NOPB?
For technical support, including LM2621MM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2621MM/NOPB requirements.
6.How does Aetrix verify that LM2621MM/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2621MM/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 LM2621MM/NOPB meets industry standards.
7.What is the process for return or replacement of LM2621MM/NOPB?
All LM2621MM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2621MM/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 LM2621MM/NOPB part is unused and in its original packaging.
Return procedure for LM2621MM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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