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Texas Instruments LM2665M6X/NOPB
- Part No.:
- LM2665M6X/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6
- Datasheet:
-
LM2665M6X/NOPB.pdf
- Description:
- IC REG CHARGE PUMP 2VIN SOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM2665M6X/NOPB from Texas Instruments is a CMOS switched-capacitor voltage converter operating as either a voltage doubler (2.5 V–5.5 V input → up to 11 V output) or precision voltage divider (1.8 V–11 V input → half-voltage output), delivering up to 40 mA with 90% typical conversion efficiency and 12-Ω output impedance - used in portable instrumentation, interface power rails, and op-amp dual-supply generation.
For engineers reviewing the LM2665M6X/NOPB datasheet, LM2665M6X/NOPB pinout, LM2665M6X/NOPB application, or LM2665M6X/NOPB equivalent, key selection criteria include its dual-mode operation (doubler/splitter), shutdown current of 1 µA, 160-kHz oscillator frequency, SOT-23-6 package compatibility, and absence of inductor requirements for compact DC-DC solutions.
Technical Context
The LM2665M6X/NOPB integrates four CMOS switches controlled by an internal 160-kHz oscillator to implement charge-pump voltage doubling or halving. Its functional modes are determined solely by external pin configuration - no mode-select pin or register programming is required.
In voltage-doubler mode, it uses two external capacitors and one startup Schottky diode (e.g., 1N5817); in voltage-splitter mode, it operates without the diode and accepts inputs up to 11 V across OUT–GND, leveraging the same internal switch array with reversed terminal roles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range (Doubler) | 2.5 V to 5.5 V - supports single-cell Li-ion, alkaline, or NiMH battery-powered systems without LDO pre-regulation. |
| Input Voltage Range (Splitter) | 1.8 V to 11 V - enables direct use with higher-voltage rails like 3.3 V, 5 V, or 9 V supplies for precision mid-rail generation. |
| Oscillator Frequency | 160 kHz (typical) - balances low EMI, minimal capacitor size (3.3 µF recommended), and reduced output ripple vs lower-frequency pumps. |
| Output Current Capability | 40 mA (max) - sufficient for powering op-amps, RS-232 transceivers, or small logic rails without thermal derating at TA ≤ 85°C. |
| Shutdown Current | 1 µA (typical) - extends battery life in sleep-mode portable devices such as blood pressure monitors or handheld radios. |
| Output Impedance | 12 Ω (typical at 40 mA) - defines load regulation error (e.g., 480 mV drop at 40 mA); dominated by MOSFET RDS(on) and capacitor ESR. |
| Conversion Efficiency | 90% (typical at 40 mA) - exceeds inductor-based boost converters at light-to-moderate loads while eliminating magnetic components. |
Pinout & Package
SOT-23-6 (DBV) package, 2.90 mm × 1.60 mm body, 1.45 mm max height, JEDEC MO-178 compliant, tape-and-reel (3000 pcs/reel), RoHS-compliant Sn lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - V+ | Power Input (Doubler) / Power Output (Splitter) | In doubler mode: main supply input; in splitter mode: positive output node - role flips based on external connection topology. |
| 2 - GND | Ground Reference | Common return for supply, oscillator, and output circuits; must be low-impedance for stable switching and minimal noise coupling. |
| 3 - CAP− | Flying Capacitor Negative Terminal | Connects to negative side of external flying capacitor (C1); forms charge-transfer path during both doubler and splitter phases. |
| 4 - SD | Shutdown Control Input | Active-low enable: tie to GND for normal operation; >40% of V+ forces shutdown, reducing supply current to 1 µA. |
| 5 - OUT | Power Output (Doubler) / Power Input (Splitter) | In doubler mode: regulated 2×V+ output; in splitter mode: high-side input rail - same pin serves inverted function in each mode. |
| 6 - CAP+ | Flying Capacitor Positive Terminal | Connects to positive side of external flying capacitor (C1); alternately charges/discharges with CAP− to transfer energy between rails. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode topology (doubler/splitter) | Single IC replaces two discrete charge-pump designs - reduces BOM count and PCB area without sacrificing flexibility. |
| No-inductor operation | Enables ultra-thin, EMI-quiet power conversion using only ceramic capacitors - ideal for space-constrained handheld instruments. |
| 160-kHz fixed-frequency oscillator | Guarantees predictable ripple spectrum and simplifies EMI filtering; eliminates need for external timing components or frequency tuning. |
| 1-µA shutdown current | Supports <1 µA system-level standby power when paired with microcontroller-controlled SD pin assertion. |
| Internal CMOS switch array | Four matched, low-RDS(on) switches (3.5 Ω typ. sum) minimize conduction loss and maximize efficiency at 40 mA load. |
Applications
| Portable Medical Instrumentation | Low-Power Interface Power |
|---|---|
|
Use Scenario: Generating ±5 V rails from a single 5 V supply in handheld blood pressure monitors for analog front-end op-amps and ADC drivers. IC Role / Device Role / Timing Role: Voltage splitter providing precise mid-rail (2.5 V) reference and doubled (10 V) bias for sensor excitation and signal conditioning. Use Value: Eliminates need for dual-output DC-DC or transformer-based isolated supplies - reduces cost, size, and qualification effort for Class II medical devices. |
Use Scenario: Powering RS-232 line drivers in industrial handheld radios where only a 3.3 V main rail is available. IC Role / Device Role / Timing Role: Voltage doubler converting 3.3 V to 6.6 V, meeting minimum ±5 V requirement for legacy serial interface compliance. Use Value: Achieves RS-232 voltage compliance without inductors or high-voltage charge pumps - improves reliability and reduces board-level EMI susceptibility. |
| Op-Amp Dual-Supply Generation | Battery-Powered Test Equipment |
|
Use Scenario: Creating symmetric ±3.3 V supplies from a single 3.3 V Li-ion cell in portable oscilloscope front-ends. IC Role / Device Role / Timing Role: Splitter generating 1.65 V reference and doubler generating 6.6 V, then regulated down to ±3.3 V via LDOs. Use Value: Enables true bipolar operation of rail-to-rail op-amps with <100 ppm offset drift - critical for high-fidelity signal acquisition. |
Use Scenario: Supplying auxiliary voltage rails in handheld multimeters requiring 9 V for LCD bias and 5 V for MCU core logic. IC Role / Device Role / Timing Role: Doubler converting 4.5 V (3×AA) to 9 V for display; splitter generating 2.25 V reference for analog measurement scaling. Use Value: Consolidates three separate voltage functions into one SOT-23-6 IC - cuts component count by 60% versus discrete charge-pump + LDO solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor voltage converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX680ESA+ | Fixed 100-kHz oscillator; requires two flying capacitors; no shutdown pin; 10 mA max output. | Limited to low-current bias generation; unsuitable for 40 mA loads or battery-shutdown optimization. | Select when lowest BOM cost is prioritized over output current and power management features. |
| TPS60403DBVR | 2.5 V–5.5 V input; 60-kHz oscillator; integrated flying caps; 60 mA output; 2.5 µA shutdown current. | Higher output current but lower efficiency (85% typ.) and larger solution size due to integrated caps. | Select when board space allows larger footprint and higher load current outweighs efficiency and external component flexibility. |
Compared with MAX680ESA+ and TPS60403DBVR, the LM2665M6X/NOPB uniquely combines dual-mode operation, 40 mA capability, 1 µA shutdown, and SOT-23-6 footprint - making it optimal for space-constrained, battery-sensitive applications requiring flexible rail generation without inductors.
Availability
LM2665M6X/NOPB is available at Aetrix Electronics and suitable for portable medical instrumentation, low-power interface power, op-amp dual-supply generation, and battery-powered test equipment requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LM2665M6X/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 designing analog ICs, embedded processors, and digital signal solutions for industrial, automotive, and consumer applications.
The LM2665 belongs to TI's switched-capacitor voltage converter product line, engineered specifically for compact, inductorless DC-DC conversion in battery-powered portable electronics where size, efficiency, and simplicity are critical.
FAQ
What is the maximum input voltage the LM2665M6X/NOPB can handle in voltage-splitter mode?
The LM2665M6X/NOPB supports input voltages from 1.8 V to 11 V in voltage-splitter mode, where the full input is applied between the OUT and GND pins. This allows direct use with common 3.3 V, 5 V, or 9 V rails to generate precise mid-rail references without external regulators. The 11 V limit is defined by absolute maximum ratings for OUT-to-GND voltage.
Does the LM2665M6X/NOPB require an external diode in all configurations?
The LM2665M6X/NOPB requires an external Schottky diode (e.g., 1N5817) only in voltage-doubler mode for startup - it ensures reliable oscillator initialization when VOUT begins near 0 V. In voltage-splitter mode, no diode is needed because the internal oscillator runs directly from the OUT–GND rail, which is present at power-on.
Can multiple LM2665M6X/NOPB ICs be paralleled to increase output current?
Yes, multiple LM2665M6X/NOPB ICs can be paralleled to reduce effective output resistance and increase total output current beyond 40 mA. Each device requires its own flying capacitor (C1), but a single shared output capacitor (C2) suffices. The composite output resistance follows ROUT(total) = ROUT/N, where N is the number of paralleled units.
What is the purpose of the SD pin on the LM2665M6X/NOPB, and how is it controlled?
The SD (Shutdown) pin on the LM2665M6X/NOPB is an active-low enable input that disables internal switching and reduces quiescent current to 1 µA typical. It must be tied to GND for normal operation. To enter shutdown, apply a voltage >40% of V+ to SD - no external pull-up is required, and the pin has no internal bias.
How does the LM2665M6X/NOPB achieve voltage doubling without an inductor?
The LM2665M6X/NOPB achieves voltage doubling using a switched-capacitor (charge-pump) architecture: four internal CMOS switches alternate charging and transferring charge between two external capacitors (C1 and C2). During phase one, C1 charges to V+; during phase two, C1's stored charge stacks in series with V+, producing ~2×V+ at the OUT pin - all without magnetic energy storage.
LM2665M6X/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Ratiometric
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2Vin, Vin/2
- Voltage - Output (Max):
- -
- Current - Output:
- 40mA
- Frequency - Switching:
- 80kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
LM2665M6X/NOPB FAQ
1.How can I place an order for LM2665M6X/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2665M6X/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 LM2665M6X/NOPB reliable?
The price and inventory of LM2665M6X/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2665M6X/NOPB is usually 5 days.
3.What payment methods are accepted for LM2665M6X/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2665M6X/NOPB transactions.
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4.How is shipping managed for LM2665M6X/NOPB?
LM2665M6X/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2665M6X/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 LM2665M6X/NOPB?
For technical support, including LM2665M6X/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2665M6X/NOPB requirements.
6.How does Aetrix verify that LM2665M6X/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2665M6X/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 LM2665M6X/NOPB meets industry standards.
7.What is the process for return or replacement of LM2665M6X/NOPB?
All LM2665M6X/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2665M6X/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 LM2665M6X/NOPB part is unused and in its original packaging.
Return procedure for LM2665M6X/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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