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Texas Instruments LM2611BMF/NOPB
- Part No.:
- LM2611BMF/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2611BMF/NOPB.pdf
- Description:
- IC REG CUK ADJ 900MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,188
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Product details
Overview
LM2611BMF/NOPB from Texas Instruments is a current-mode PWM Cuk converter IC with integrated DMOS FET, designed for high-efficiency negative voltage generation. It operates from 2.7 V to 14 V input, delivers −5 V at 300 mA from 5-V input, features 1.4-MHz fixed switching frequency, 0.7-Ω RDS(ON), and 1-mVp-p output ripple-enabling compact bias supplies in portable imaging and display systems.
For engineers reviewing the LM2611BMF/NOPB datasheet, LM2611BMF/NOPB pinout, LM2611BMF/NOPB application, or LM2611BMF/NOPB equivalent, key selection criteria include its Grade B current limit (0.9 A), SOT-23-5 package constraints, Cuk topology requirements (dual inductors, Cuk capacitor), and NFB-based output voltage programming using external resistors.
Technical Context
The LM2611BMF/NOPB implements a fixed-frequency (1.4 MHz) current-mode control architecture with internal slope compensation and cycle-by-cycle overcurrent protection. Its functional block includes an integrated 0.7-Ω DMOS switch, 1.23-V precision negative feedback reference, and shutdown logic that reduces quiescent current to <1 µA.
This Grade B variant is optimized for −5-V/300-mA operation from 5-V input using Cuk topology-leveraging separate input (L1) and output (L2) inductors to minimize RMS current and voltage ripple on both sides, unlike buck-boost or flyback alternatives.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Cuk inverting DC/DC converter with integrated switch and current-sense circuitry |
| Input Voltage Range | 2.7 V to 14 V - supports single-cell Li-ion, USB, and industrial 5–12-V rails |
| Output Voltage | Adjustable via NFB pin; −5 V typical at 300 mA with RFB1=29.4 kΩ, RFB2=10 kΩ |
| Switch RDS(ON) | 0.7 Ω (typical) - enables >85% efficiency at 300 mA, 5-V input |
| Switch Current Limit | 0.9 A (Grade B) - sets maximum load capability and thermal boundary in SOT-23 package |
| Switching Frequency | 1.4 MHz (±20%) - allows use of sub-22-µH inductors and ceramic capacitors ≤22 µF |
| Feedback Reference | −1.23 V (±25 mV) - defines output setpoint accuracy and temperature drift (±10 ppm/°C) |
Pinout & Package
LM2611BMF/NOPB is housed in a 5-pin SOT-23 (DBV) package measuring 1.60 mm × 2.90 mm, with exposed pad not connected internally. Thermal resistance is RθJA = 163.5°C/W (JEDEC standard layout).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Switch drain node | Connects to L1–CCUK junction; carries peak current up to 0.9 A; requires low-inductance routing |
| 2 - GND | Analog + power ground | Single-point return for feedback, shutdown, and power paths; must tie to PCB ground plane under IC |
| 3 - NFB | Negative feedback input | Senses regulated output via resistor divider; −1.23-V reference sets VOUT = −1.23 × (1 + RFB1/RFB2) |
| 4 - SHDN | Active-high enable | Logic-level input: ≥1.8 V enables regulation; ≤0.5 V forces shutdown (<1 µA IQ) |
| 5 - VIN | Power input | Supplies internal circuitry and switch; requires local 0.1-µF ceramic bypass within 0.2 inches |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Cuk controller + DMOS switch | Eliminates external MOSFET and gate driver; reduces BOM count and layout complexity for inverting supplies |
| 1.4-MHz fixed-frequency PWM | Enables use of small, low-cost 15–22-µH power inductors and X5R/X7R ceramic capacitors ≤22 µF |
| Low-RMS-current Cuk topology | Reduces input/output capacitor stress versus buck-boost; supports stable operation with 10–100-mA RMS ripple |
| Programmable output via NFB pin | Two-resistor divider sets output from −3.3 V to −12 V without external op-amps or references |
| Hysteretic pulse-skipping mode | Maintains regulation at light loads (<50 mA) while reducing switching losses and improving standby efficiency |
Applications
| MR Head Bias | Digital Camera CCD Bias |
|---|---|
Use Scenario: Precision negative bias for magneto-resistive read heads in HDD preamplifiers. IC Role / Device Role / Timing Role: Primary inverting regulator generating stable −5 V from 3.3-V or 5-V system rail. Use Value: Low 1-mVp-p ripple ensures minimal head-positioning noise; 0.9-A current limit supports transient head-current demands. |
Use Scenario: High-stability analog bias for CCD image sensor vertical/horizontal drivers. IC Role / Device Role / Timing Role: Dedicated negative supply delivering −5 V at 300 mA with tight line/load regulation. Use Value: 1.4-MHz switching avoids interference with CCD pixel clock harmonics; Cuk topology minimizes EMI coupling into analog signal paths. |
| LCD Bias Supply | GaAs FET Bias |
Use Scenario: Negative gate drive for active-matrix LCD source/drain drivers requiring −5 V to −10 V. IC Role / Device Role / Timing Role: Compact inverting DC/DC converter mounted adjacent to display driver ICs. Use Value: SOT-23-5 footprint enables placement in space-constrained bezel areas; shutdown pin enables panel power sequencing. |
Use Scenario: Low-noise negative bias for GaAs FET RF amplifiers in portable transceivers. IC Role / Device Role / Timing Role: Local point-of-load regulator isolating sensitive RF stages from noisy digital supplies. Use Value: Dual-inductor Cuk topology suppresses conducted noise on both input and output; <1 µA shutdown current extends battery life. |
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 |
|---|---|---|---|
| LM2611AMF/NOPB | Grade A: 1.2-A switch current limit, 0.5-Ω RDS(ON), same pinout/package | Supports higher output current (up to 400 mA at −5 V) and lower conduction loss | Select when >300 mA load or <0.5-V dropout at full load is required; otherwise LM2611BMF/NOPB suffices |
| MAX738AESA+ | Charge-pump inverter; no inductors; 100-mA max output; ±1.5% initial accuracy | Limited to low-current bias (≤100 mA); higher output ripple (>20 mVp-p) and poorer line regulation | Choose only for ultra-low-cost, ultra-small-footprint designs where 300-mA capability and low ripple are not critical |
Compared with LM2611AMF/NOPB, the LM2611BMF/NOPB trades 300-mA capability and thermal margin for cost-sensitive volume production; versus MAX738AESA+, it delivers 3× higher current and 20× lower ripple at the expense of two external inductors and board area.
Availability
LM2611BMF/NOPB is available at Aetrix Electronics and suitable for MR head bias, CCD imaging, LCD panel drivers, and GaAs FET bias applications requiring stable component supply, long-term manufacturability, and TI-qualified automotive-grade traceability.
Supply support for LM2611BMF/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 company specializing in analog, embedded processing, and power management ICs, with leadership in high-reliability industrial and automotive power solutions.
The LM2611 product line delivers integrated Cuk converter ICs for precision negative-voltage biasing in portable imaging, display, and RF systems-designed to replace discrete inductor-based inverters with simplified, repeatable layouts.
FAQ
What is the maximum output current capability of the LM2611BMF/NOPB?
The LM2611BMF/NOPB supports up to 300 mA continuous output current at −5 V from a 5-V input, limited by its Grade B switch current rating of 0.9 A and thermal dissipation in the SOT-23-5 package. Derating is required above 85°C ambient or with poor PCB copper area; full 300-mA operation assumes 22-µH inductors and proper thermal layout per TI's DBV package guidelines.
How is the output voltage programmed on the LM2611BMF/NOPB?
The LM2611BMF/NOPB uses its NFB pin to sense output voltage via an external resistor divider. With a precise −1.23-V internal reference, VOUT = −1.23 × (1 + RFB1/RFB2). For −5 V, TI recommends RFB1 = 29.4 kΩ and RFB2 = 10 kΩ. Resistor values must be ≤50 kΩ total to minimize NFB pin bias current error.
Does the LM2611BMF/NOPB require external compensation components?
No-LM2611BMF/NOPB features fully internal compensation optimized for 10–22-µH inductors and standard Cuk capacitor values. A feed-forward capacitor (CFF) across RFB1 is optional and used only to improve transient response; it is not required for stability. TI provides design guidance for CFF sizing in SNOS965J Section 7.3.6.
What is the shutdown behavior of the LM2611BMF/NOPB?
When the SHDN pin is pulled below 0.5 V, the LM2611BMF/NOPB enters shutdown mode with quiescent current <1 µA. The internal switch turns off, SW pin floats, and feedback amplifier is disabled. Regulation resumes within microseconds after SHDN rises above 1.8 V. No external discharge path is needed for COUT.
Can the LM2611BMF/NOPB operate from a 12-V input to generate −5 V?
Yes-the LM2611BMF/NOPB supports input voltages up to 14 V. At 12-V input, it delivers −5 V at up to ~375 mA (per Figure 28 in SNOS965J), constrained by thermal limits and switch current rating. Efficiency drops to ~80% due to higher duty cycle; layout must prioritize thermal relief on the GND pad and minimize SW node parasitics.
LM2611BMF/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- 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):
- -32V
- Current - Output:
- 900mA
- 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
LM2611BMF/NOPB FAQ
1.How can I place an order for LM2611BMF/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2611BMF/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 LM2611BMF/NOPB reliable?
The price and inventory of LM2611BMF/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2611BMF/NOPB is usually 5 days.
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4.How is shipping managed for LM2611BMF/NOPB?
LM2611BMF/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2611BMF/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 LM2611BMF/NOPB?
For technical support, including LM2611BMF/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2611BMF/NOPB requirements.
6.How does Aetrix verify that LM2611BMF/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2611BMF/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 LM2611BMF/NOPB meets industry standards.
7.What is the process for return or replacement of LM2611BMF/NOPB?
All LM2611BMF/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2611BMF/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 LM2611BMF/NOPB part is unused and in its original packaging.
Return procedure for LM2611BMF/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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