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Texas Instruments LM2611AMF/S7002213
- Part No.:
- LM2611AMF/S7002213
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2611AMF/S7002213.pdf
- Description:
- IC REG CUK ADJ SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:14,010
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Product details
Overview
LM2611AMF/S7002213 from Texas Instruments (formerly National Semiconductor) is a current-mode PWM inverting Cuk converter IC designed for high-efficiency positive-to-negative voltage conversion. It operates from 2.7V to 14V input, delivers up to −36V + VIN output, features 1.4MHz switching frequency, 1.2A switch current limit (Grade A), and 0.5Ω RDS(ON), enabling compact bias supplies for CCD, LCD, and GaAs FET applications.
For engineers reviewing the LM2611AMF/S7002213 datasheet, LM2611AMF/S7002213 pinout, LM2611AMF/S7002213 application, or LM2611AMF/S7002213 equivalent, this page provides verified technical context, validated pin functions, real-world design constraints for Cuk topology implementation, and confirmed alternatives for negative-bias power supply designs requiring low ripple and small magnetics.
Technical Context
The LM2611AMF/S7002213 implements a fixed-frequency (1.0–1.8MHz) current-mode PWM controller optimized for Cuk topology, using an internal 1.23V reference and cycle-by-cycle peak-current limiting. Its architecture requires separate input and output inductors to achieve continuous input/output current waveforms and ultra-low RMS ripple-distinct from buck-boost or flyback inverters.
It integrates a low-RDS(ON) DMOS FET (0.5Ω typical), shutdown control with <1µA ISHDN, and internal compensation tuned for 10–22µH inductors. Thermal shutdown activates at 163°C and recovers at 155°C, with θJA = 256°C/W in SOT23-5 package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Cuk inverter: enables simultaneous low-input-ripple and low-output-ripple operation with continuous conduction on both sides. |
| Input Voltage Range | 2.7V to 14V: supports single-cell Li-ion, USB, and industrial 12V rails without external LDO pre-regulation. |
| Switch Current Limit | 1.2A (Grade A): sets maximum load capability; peak switch current = iL1 + iL2, constraining inductor sizing and thermal design. |
| RDS(ON) | 0.5Ω (typ): directly determines conduction loss and efficiency at high load; lower than Grade B (0.7Ω). |
| Output Ripple | 1mVp-p: achieved via dual-inductor filtering; enables noise-sensitive analog biasing without post-regulation. |
| Shutdown Current | <1µA: extends battery life in portable systems during standby; SHDN pin active-high with 1.5V threshold. |
| Reference Voltage | −1.23V (NFB pin): sets output via resistor divider; allows precise adjustment of negative output (e.g., −5V, −12V). |
Pinout & Package
LM2611AMF/S7002213 is housed in a 5-lead SOT-23 package (NS Package Number MF05A, Package ID S40A), with exposed pad not connected internally. The package supports surface-mount reflow and fits ≤10mm² board area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Internal switch drain node | Connects to junction of input inductor (L1) and Cuk capacitor (CCUK); carries high di/dt; requires tight layout and ground plane return. |
| 2 - GND | Analog and power ground | Single-point connection for feedback, shutdown, and power return; must tie to low-impedance ground plane under IC body. |
| 3 - NFB | Negative feedback input | Senses regulated output via resistor divider; −1.23V reference enables output programming (e.g., R1/R2 = 3.27kΩ/10kΩ for −5V). |
| 4 - SHDN | Shutdown control | Active-high logic input; ≥1.5V enables regulation; grounded disables switching and reduces IQ to <1µA. |
| 5 - VIN | Power input | Accepts 2.7–14V; requires local 0.1µF ceramic bypass within 0.2 inches to suppress HF noise and stabilize regulation. |
Key Features
| Feature | Design Value |
|---|---|
| 1.4MHz fixed-frequency PWM | Enables use of sub-3mm × 3mm inductors and 10µF ceramic output capacitors-reducing solution size by >40% vs. 500kHz converters. |
| Integrated 0.5Ω DMOS FET (Grade A) | Eliminates external MOSFET and gate driver; achieves >85% efficiency at 300mA (5V→−5V) without heatsinking. |
| Hysteretic light-load mode | Automatically transitions from PWM to pulse-skipping below ~50mA, reducing no-load IQ to 270µA while maintaining regulation. |
| Internal compensation | Tuned for 10–22µH inductors; removes need for external compensation network-simplifies design and improves production yield. |
| Thermal shutdown with hysteresis | Shuts down at 163°C and resumes at 155°C; prevents damage during overload or poor PCB thermal design. |
Applications
| MR Head Bias | Digital Camera CCD Bias |
|---|---|
|
Use Scenario: Providing stable, low-noise −12V bias to magnetoresistive (MR) read heads in HDD preamplifiers. IC Role / Device Role / Timing Role: Inverting DC-DC regulator generating precise negative rail from 3.3V or 5V system supply. Use Value: 1mVp-p output ripple ensures signal integrity in high-sensitivity analog front-end; 1.4MHz operation avoids interference with servo control frequencies. |
Use Scenario: Supplying −8V to −15V bias for CCD image sensors in compact digital cameras and camcorders. IC Role / Device Role / Timing Role: Compact, high-efficiency inverter delivering regulated negative voltage with minimal board space. Use Value: SOT23-5 footprint and 10–22µH inductors enable integration into <15mm × 15mm camera modules; low shutdown current extends battery runtime. |
| LCD Panel Bias | GaAs FET Bias |
|
Use Scenario: Generating −5V to −10V VEE supply for TFT-LCD source driver ICs in automotive and industrial displays. IC Role / Device Role / Timing Role: Negative voltage generator supporting wide input range (6–14V vehicle battery) and extended temperature operation. Use Value: −40°C to +125°C operating range and 14V absolute max input ensure reliability in under-hood display systems; low EMI due to continuous current waveforms. |
Use Scenario: Delivering −3V to −5V gate bias for GaAs FET RF amplifiers in wireless infrastructure and test equipment. IC Role / Device Role / Timing Role: Low-noise, fast-transient inverter powering critical RF bias nodes. Use Value: Internal compensation and optional feed-forward capacitor (CFF) support stable operation under dynamic RF load steps; 0.5Ω RDS(ON) minimizes thermal drift in bias voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2612AMF | Same Cuk architecture but Grade B: 0.9A current limit, 0.7Ω RDS(ON), identical pinout and package. | Lower max output current and higher conduction loss; suitable only for ≤200mA loads where thermal margin is sufficient. | Select LM2612AMF only when cost sensitivity outweighs performance needs and load current remains below 200mA. |
| TPS60403DBVR | Charge-pump inverter (no inductors); 60mA max output; 500kHz switching; ±1.5% line regulation. | Cannot match LM2611AMF/S7002213's 300mA+ capability, low ripple, or wide input range; limited to low-power logic bias. | Choose TPS60403DBVR only for space-constrained, ultra-low-power applications where inductor-free design is mandatory and load ≤60mA. |
Compared with LM2612AMF and TPS60403DBVR, LM2611AMF/S7002213 delivers higher current, lower ripple, and wider input range-making it the only option among the three capable of driving MR heads or CCDs at full specification without derating or external components.
Availability
LM2611AMF/S7002213 is available at Aetrix Electronics and suitable for MR head bias, CCD imaging, LCD panel bias, and GaAs FET bias applications requiring stable component supply, long-term lifecycle assurance, and guaranteed traceable sourcing.
Supply support for LM2611AMF/S7002213 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 full technical support, datasheet archives, and product continuity for legacy parts including the LM2611 series.
The LM2611 belongs to TI's precision inverting DC-DC converter product line, engineered specifically for analog biasing applications demanding low noise, high efficiency, and minimal external component count in space-constrained systems.
FAQ
What is the maximum output voltage magnitude achievable with LM2611AMF/S7002213?
The LM2611AMF/S7002213 can produce a regulated negative output voltage up to −(36 − VIN(MAX)). With its 14V absolute maximum input rating, the largest magnitude output is −22V (i.e., −(36 − 14)). This limit arises from internal switch voltage stress and is confirmed in Absolute Maximum Ratings. Exceeding −22V risks damage even if input is reduced.
Does LM2611AMF/S7002213 require external compensation components?
No, LM2611AMF/S7002213 features fully internal compensation optimized for 10–22µH input/output inductors. External compensation is unnecessary for standard Cuk designs. However, a feed-forward capacitor (CFF) may be added across the top feedback resistor to improve transient response-this is optional and does not replace internal compensation.
Can LM2611AMF/S7002213 operate with input voltages below 2.7V?
No. The LM2611AMF/S7002213 has a specified minimum input voltage of 2.7V per Operating Conditions. Below this, startup fails and regulation is not guaranteed. The internal reference and gate drive circuitry require ≥2.7V to function correctly; attempting operation at 2.5V results in erratic switching or no output.
How does the shutdown functionality affect quiescent current in LM2611AMF/S7002213?
When SHDN is pulled low, LM2611AMF/S7002213 enters shutdown mode with total supply current reduced to 0.024–1µA (typical 0.1µA). This is verified in Electrical Characteristics under ISHDN at VSHDN = 0V. The internal oscillator, driver, and reference are disabled-only leakage paths remain active.
Is LM2611AMF/S7002213 pin-compatible with LM2612AMF?
Yes, LM2611AMF/S7002213 and LM2612AMF share identical pinout, package (SOT23-5), and terminal functions. They differ only in Grade A (1.2A/0.5Ω) vs. Grade B (0.9A/0.7Ω) specifications. No PCB changes are required for substitution-but output current and thermal performance must be re-verified for the target load.
LM2611AMF/S7002213 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Negative
- Topology:
- Cuk
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 14V
- Voltage - Output (Min/Fixed):
- -1.23V
- Voltage - Output (Max):
- -14V
- Current - Output:
- -
- Frequency - Switching:
- 1.4MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM2611AMF/S7002213 FAQ
1.How can I place an order for LM2611AMF/S7002213 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2611AMF/S7002213 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 LM2611AMF/S7002213 reliable?
The price and inventory of LM2611AMF/S7002213 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2611AMF/S7002213 is usually 5 days.
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LM2611AMF/S7002213 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2611AMF/S7002213 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 LM2611AMF/S7002213?
For technical support, including LM2611AMF/S7002213 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2611AMF/S7002213 requirements.
6.How does Aetrix verify that LM2611AMF/S7002213 is sourced from the original manufacturer or authorized distributors?
All LM2611AMF/S7002213 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 LM2611AMF/S7002213 meets industry standards.
7.What is the process for return or replacement of LM2611AMF/S7002213?
All LM2611AMF/S7002213 units undergo pre-shipment inspection (PSI). If there is an issue with LM2611AMF/S7002213, 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 LM2611AMF/S7002213 part is unused and in its original packaging.
Return procedure for LM2611AMF/S7002213:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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