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Texas Instruments LM2619MTC/NOPB
- Part No.:
- LM2619MTC/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM2619MTC/NOPB.pdf
- Description:
- IC REG BUCK ADJ 500MA 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,406
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Product details
Overview
LM2619MTC from Texas Instruments (formerly National Semiconductor) is a 500mA synchronous step-down DC-DC converter optimized for single-cell Li-ion battery-powered systems. It regulates input voltages from 2.8V to 5.5V down to adjustable outputs of 1.5V–3.6V, features ±2% feedback voltage precision, 600kHz fixed-frequency PWM mode, and supports three power modes-PWM, PFM, and shutdown-for mobile RF applications like cellular handsets.
For engineers reviewing the LM2619MTC datasheet, LM2619MTC pinout, LM2619MTC application, or LM2619MTC equivalent, key selection considerations include its 14-pin TSSOP package, external compensation capability, 160µA typical quiescent current in PFM mode, 0.02µA shutdown current, and internal synchronous rectification enabling up to 95% efficiency at 200mA load.
Technical Context
The LM2619MTC employs a current-mode buck architecture with internal PFET/NFET synchronous rectification. Its error amplifier output (EAOUT) and inverting input (EANEG) support external compensation networks to stabilize loop response across varying loads and output voltages.
Operating mode is digitally controlled via the SYNC/MODE pin: high for 600kHz PWM, low for hysteretic PFM, or driven by an external 500kHz–1MHz clock for synchronization. The EN pin provides Schmitt-trigger enable/disable control with soft-start activation on enable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.8V to 5.5V - supports full discharge range of single Li-ion cell without dropout below 2.8V. |
| Output Voltage Range | 1.5V to 3.6V - set externally via resistor divider; 1.5V internal reference enables precise regulation. |
| Max Output Current | 500mA - sustained in PWM mode; limited by internal PFET RDSON (630mΩ typ) and thermal design. |
| Feedback Voltage Precision | ±2% - ensures tight DC output regulation critical for RF circuitry and baseband processors. |
| PWM Quiescent Current | 600µA typ - minimizes standby loss while maintaining fast transient response and low-noise operation. |
| PFM Quiescent Current | 160µA typ - extends battery life during idle/standby states in portable devices. |
| Shutdown Current | 0.02µA typ - reduces system-level leakage during deep sleep or power-off sequencing. |
| Switching Frequency | 600kHz (PWM), variable (PFM) - enables compact 10µH inductors and 22µF ceramic output capacitors. |
Pinout & Package
LM2619MTC is housed in a 14-pin Thin Shrink Small Outline Package (TSSOP) with exposed pad (NSC drawing MTC14), optimized for thermal performance and board space efficiency in handheld RF designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable Input | Schmitt-trigger digital input; must be held low during power-up until VIN ≥ 2.8V to prevent erratic startup. |
| SYNC/MODE | Mode Control & Sync Input | Selects PWM (high), PFM (low), or external sync (500kHz–1MHz clock); slew rate >5V/100µs required. |
| EAOUT | Error Amplifier Output | Connects to external compensation network (R3/C4) to tailor loop bandwidth and transient response. |
| EANEG | Error Amplifier Inverting Input | Reference node for external compensation; ties to FB through feedback divider and C5 for noise immunity. |
| FB | Feedback Input | Analog input sensing output voltage via resistor divider; bias current <100nA enables high-impedance dividers. |
| SGND | Analog Ground | Reference for control circuitry and error amplifier; must be separated from PGND in layout to avoid noise coupling. |
| VDD | Analog Supply | Power for internal bias and control blocks; requires local 0.1µF ceramic decoupling to SGND. |
| PVIN | Power Input | High-current path to internal PFET switch; connects directly to input filter capacitor with low-inductance routing. |
| SW | Switch Node | Connection to internal PFET drain and NFET source; drives external inductor; high dv/dt node requiring careful layout. |
| PGND | Power Ground | Return path for high-current switching elements; must be tied to SGND at single point near device. |
Key Features
| Feature | Design Value |
|---|---|
| Three selectable operating modes | PWM (low-noise, full-load), PFM (ultra-low IQ), and shutdown (0.02µA) - enables dynamic power management in mobile SoC subsystems. |
| Internal synchronous rectification | Integrated NFET replaces external Schottky diode - eliminates forward voltage drop, improves efficiency at low VOUT, and reduces BOM count. |
| External compensation | EAOUT/EANEG pins allow tuning of loop stability for diverse output capacitors, inductors, and load conditions - essential for robust performance across production variance. |
| 100% duty cycle capability | Enables lowest possible dropout - maintains regulation even when VIN approaches VOUT, critical for end-of-battery-life operation. |
| Overvoltage protection (OVP) | Auto-skips pulses if VOUT exceeds regulation threshold by ~100mV - prevents damage to downstream logic or RF ICs during light-load PWM operation. |
| Thermal shutdown & current limit | Protects against sustained overload or poor heatsinking; trips at 150°C junction, recovers at 130°C with soft-start - avoids latch-up and enables fault-tolerant design. |
Applications
| Mobile Handset Power Rail | RF Front-End Bias Supply |
|---|---|
Use Scenario: Powers baseband processor core voltage (e.g., 1.8V) from a single Li-ion cell in GSM/UMTS handsets during active call and data transmission. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering stable, low-noise 500mA output with fast load transient response to handle CPU burst currents. Use Value: Enables use of compact 10µH inductors and 22µF ceramic caps; 600kHz switching avoids IF band interference while sustaining >93% efficiency at 200mA. | Use Scenario: Supplies clean 2.5V bias to PA driver stages and LNA modules in 2.4GHz WLAN or Bluetooth radio cards. IC Role / Device Role / Timing Role: Low-ripple, low-noise power source with PFM mode active during receive standby to minimize RX chain noise floor degradation. Use Value: 5mV typical output ripple (COUT = 22µF) and 160µA PFM IQ preserve RF sensitivity; external compensation allows optimization for low-ESR polymer caps. |
| Hand-Held Radio Baseband | Wireless PC Card Core Logic |
Use Scenario: Generates 1.5V core voltage for digital signal processor (DSP) in professional two-way radios operating across wide temperature ranges. IC Role / Device Role / Timing Role: High-reliability buck converter with thermal shutdown and current limiting - withstands intermittent high-current bursts during voice encoding/decoding. Use Value: 125°C max junction rating and 110°C/W θJA allow operation in sealed enclosures; 100% duty cycle sustains regulation down to 2.9V input. | Use Scenario: Provides regulated 3.3V supply to FPGA configuration logic and USB interface controllers in mini-PCI wireless LAN cards. IC Role / Device Role / Timing Role: System power manager with EN-controlled sequencing - coordinates power-up with host controller reset assertion and firmware initialization. Use Value: Soft-start prevents inrush current on shared 3.3V bus; SYNC input allows synchronization to host clock domain to suppress beat frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 3-MHz fixed-frequency operation, 300mA output, integrated compensation, smaller 6-pin WSON package. | Better suited for space-constrained, ultra-low-IQ (<10µA) applications but lacks PFM/PWM mode flexibility and external compensation. | Select when board area is critical and load current ≤300mA; not suitable for 500mA RF PA bias or custom loop tuning. |
| MAX8640YETA+ | 2.25-MHz switching, 600mA output, I²C programmable output (1.0V–3.3V), no PFM mode, 10-pin µMAX package. | Offers digital voltage control for dynamic scaling but higher quiescent current (25µA) and no low-noise PFM option for RF receivers. | Choose for systems requiring firmware-adjustable VDD; avoid where analog PFM mode is needed for RF sensitivity optimization. |
Compared with TPS62231DRVR and MAX8640YETA+, the LM2619MTC uniquely balances 500mA capability, dual-mode operation (PWM/PFM), external compensation, and 0.02µA shutdown - making it optimal for legacy mobile RF designs requiring analog power management granularity and proven thermal robustness in TSSOP form factor.
Availability
LM2619MTC is available at Aetrix Electronics and suitable for mobile handset power rails, RF front-end bias supplies, hand-held radio baseband circuits, and wireless PC card core logic requiring stable component supply across extended product lifecycles.
Supply support for LM2619MTC 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 acquired National Semiconductor in 2011 and maintains its high-performance analog portfolio, including legacy power management ICs designed for reliability and manufacturability in volume consumer electronics.
The LM2619MTC belongs to National's mobile power management product line, engineered specifically for battery-powered RF systems demanding low-noise regulation, multi-mode efficiency optimization, and robust fault protection in compact handheld form factors.
FAQ
What is the minimum input voltage required for stable operation of the LM2619MTC?
The LM2619MTC requires a minimum input voltage of 2.8V for guaranteed operation. Below this threshold, the device may not regulate correctly or initiate soft-start reliably. The EN pin must be held low during system power-up until VIN reaches 2.8V to prevent erratic behavior - a requirement explicitly defined in the Absolute Maximum Ratings and Device Information sections of the datasheet. This ensures proper turn-on sequencing in Li-ion-powered mobile systems.
Does the LM2619MTC support external synchronization, and what frequency range is acceptable?
Yes, the LM2619MTC supports external synchronization via the SYNC/MODE pin. When driven by an external clock, it operates in PWM mode and locks to the rising edge of the input signal across a frequency range of 500kHz to 1MHz. The clock must have a duty cycle between 30% and 70%, with overshoot/undershoot limited to ±100mV relative to GND or VDD. This capability allows noise-sensitive systems to align switching harmonics away from critical IF bands.
How does the LM2619MTC implement overvoltage protection, and when is it active?
The LM2619MTC implements overvoltage protection (OVP) using an internal comparator that monitors the FB pin. When the output voltage rises approximately 100mV above the regulation threshold (e.g., 1.6V for a 1.5V output), the OVP circuit inhibits PWM pulses until the output returns to regulation. This feature activates only in PWM mode under light-load conditions and prevents damage to downstream logic or RF components. The OVP threshold scales with the feedback resistor divider ratio.
Can the LM2619MTC operate with 100% duty cycle, and what is the practical benefit?
Yes, the LM2619MTC supports 100% duty cycle operation, allowing the internal PFET switch to remain continuously on when input voltage approaches the regulated output voltage. This capability minimizes dropout and sustains regulation down to VIN ≈ VOUT + IOUT × (RDSON_P + RDC_IND), which is critical for maintaining system functionality during end-of-battery-life conditions in portable devices powered by single Li-ion cells.
What type of inductor is recommended for use with the LM2619MTC, and why?
A 10µH shielded or toroidal inductor with saturation current rating exceeding the LM2619MTC's peak switch current (≥850mA) and DC resistance <0.3Ω is recommended. Shielded types reduce EMI coupling into adjacent RF circuits, while low DCR preserves efficiency. The datasheet explicitly lists part numbers (e.g., DO1608C-103, ELL6SH100M) and warns against unshielded inductors in noise-critical applications - a direct consequence of the device's 600kHz switching frequency and RF-sensitive target use cases.
LM2619MTC/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.5V
- Voltage - Output (Max):
- 3.6V
- Current - Output:
- 500mA
- Frequency - Switching:
- 640kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -25°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
LM2619MTC/NOPB FAQ
1.How can I place an order for LM2619MTC/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2619MTC/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 LM2619MTC/NOPB reliable?
The price and inventory of LM2619MTC/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2619MTC/NOPB is usually 5 days.
3.What payment methods are accepted for LM2619MTC/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2619MTC/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2619MTC/NOPB?
LM2619MTC/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2619MTC/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 LM2619MTC/NOPB?
For technical support, including LM2619MTC/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2619MTC/NOPB requirements.
6.How does Aetrix verify that LM2619MTC/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2619MTC/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 LM2619MTC/NOPB meets industry standards.
7.What is the process for return or replacement of LM2619MTC/NOPB?
All LM2619MTC/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2619MTC/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 LM2619MTC/NOPB part is unused and in its original packaging.
Return procedure for LM2619MTC/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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