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Texas Instruments LM2665M6
- Part No.:
- LM2665M6
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6
- Datasheet:
-
LM2665M6.pdf
- Description:
- IC REG CHARGE PUMP 2VIN SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,617
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Product details
Overview
LM2665M6 from Texas Instruments is a CMOS switched-capacitor voltage converter configured as a voltage doubler or voltage divider, operating from 2.5 V to 5.5 V input (doubler mode) or 1.8 V to 11 V (splitter mode), delivering up to 40 mA output current with 90% typical conversion efficiency and 12-Ω typical output impedance - used in portable instrumentation and interface power rails.
For engineers reviewing the LM2665M6 datasheet, LM2665M6 pinout, LM2665M6 application, or LM2665M6 equivalent, key selection criteria include its dual-mode operation (doubling/splitting), 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 LM2665M6 implements a four-switch CMOS charge-pump topology with internal MOSFETs having 3.5 Ω typical RDS(on) sum, operating at 160-kHz oscillator frequency (80-kHz switching frequency). Its functional modes are controlled via the SD pin: grounded for normal operation, >40% of V+ to enter shutdown.
In voltage-doubler configuration, it charges C1 to V+, then stacks V+ + VC1 to generate ~2×V+ at OUT; in voltage-splitter mode, it reconfigures terminals to divide input across OUT–GND, enabling higher input range (up to 11 V) without startup diode dependency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range (Doubler) | 2.5 V to 5.5 V - defines minimum battery voltage support (e.g., single Li-ion or 3×AA) and maximum safe rail for portable systems. |
| Input Voltage Range (Splitter) | 1.8 V to 11 V - enables use with higher-voltage rails like industrial sensors or legacy logic supplies without external regulators. |
| Output Current | Up to 40 mA - sufficient for powering op-amps, RS-232 transceivers, or small LCD bias rails in handheld devices. |
| Oscillator Frequency | 160 kHz typical - balances low EMI against capacitor size; reduces output ripple and allows use of 3.3-µF OS-CON capacitors. |
| Shutdown Current | 1 µA typical - extends battery life in sleep-mode applications such as pagers or blood pressure monitors. |
| Output Impedance | 12 Ω typical at 40 mA - determines load regulation error (e.g., 480 mV drop at full load); impacts stability when driving capacitive loads. |
| Conversion Efficiency | 90% typical at 40 mA - minimizes thermal rise in confined SOT-23-6 package; avoids need for heatsinking in thin-profile designs. |
Pinout & Package
SOT-23-6 (DBV) package, 2.90 mm × 1.60 mm body size, 1.45 mm max height, JEDEC MO-178 compliant, tape-and-reel packaged (3000 pcs/reel for LM2665M6X/NOPB.B).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - V+ | Power input (doubler) / Output (splitter) | Primary supply connection in doubler mode; becomes output node in splitter configuration - must be decoupled with low-ESR ceramic capacitor. |
| 2 - GND | Ground reference | Common return for oscillator, switches, and load - requires low-inductance layout tie to CIN and COUT ground pads. |
| 3 - CAP− | Flying capacitor negative terminal | Connects to negative side of external flying capacitor (C1); critical path for charge transfer - short wide trace required. |
| 4 - SD | Shutdown control input | Logic-level enable: <0.8 V (typ.) disables device; >2 V (typ.) activates - pulled low via resistor or direct GND tie in active operation. |
| 5 - OUT | Output (doubler) / Power input (splitter) | Delivers doubled voltage in doubler mode; accepts high-voltage input in splitter mode - drives load directly or feeds LDO for regulation. |
| 6 - CAP+ | Flying capacitor positive terminal | Connects to positive side of C1; alternately charged/discharged with CAP− - forms core energy-transfer loop with internal switches. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-mode operation | Single IC supports both voltage doubling (2.5–5.5 V → ~2×V+) and precision voltage splitting (1.8–11 V → V+/2), reducing BOM count in multi-rail portable systems. |
| No-inductor design | Eliminates magnetic components and associated EMI, enabling ultra-thin PCB layouts in space-constrained applications like PDAs and handheld medical devices. |
| Low-quiescent-current shutdown | 1 µA shutdown current enables >1-year battery shelf life in always-on monitoring devices (e.g., fire detection units) without manual power cycling. |
| Integrated 160-kHz oscillator | Fixed-frequency operation ensures predictable capacitor sizing and ripple behavior - avoids external timing components or frequency drift over temperature. |
| Robust output drive | 40 mA continuous output with 12 Ω typical source impedance supports direct driving of analog front-ends, level shifters, and small display bias circuits. |
Applications
| Portable Medical Instrumentation | Interface Power Supply |
|---|---|
|
Use Scenario: Blood pressure monitor requiring ±5 V rails for analog signal conditioning and ADC reference. IC Role / Device Role / Timing Role: LM2665M6 generates +5 V from 3.3 V main rail; paired with inverting charge pump (e.g., LM2662) for negative rail - no inductors needed. Use Value: Enables compact, low-EMI dual-rail supply in handheld enclosure where board area and noise sensitivity constrain inductor-based solutions. |
Use Scenario: RS-232 transceiver in industrial handheld radio needing ±12 V from single 5 V supply. IC Role / Device Role / Timing Role: LM2665M6 doubles 5 V to ~10 V; cascaded stage or LDO regulation achieves stable ±12 V - SD pin enables dynamic power gating during idle. Use Value: Reduces component count versus transformer-based isolated supplies while maintaining interoperability with legacy serial interfaces. |
| Handheld Test Equipment | Low-Power Sensor Interface |
|
Use Scenario: Digital multimeter with auto-ranging analog front-end requiring programmable gain amplifier bias at ±2.5 V. IC Role / Device Role / Timing Role: LM2665M6 splits 5 V supply to generate precise 2.5 V reference rail; GND-referenced output simplifies layout vs. floating regulators. Use Value: Provides accurate, low-noise mid-supply reference without trimming resistors or dedicated voltage references - improves measurement linearity. |
Use Scenario: Fire detection sensor node powered by coin-cell battery, needing 3.3 V logic and 5 V analog sensing rail. IC Role / Device Role / Timing Role: LM2665M6 doubles 3.3 V to 6.6 V, regulated down to 5 V via LP2980-5.0 LDO - SD pin synchronizes with MCU sleep cycles. Use Value: Extends battery runtime by minimizing quiescent loss during 99%+ duty-cycle sleep periods while retaining fast wake-up capability. |
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; 20 mA output; ±5 V dual-output capable; requires two flying caps per rail. | Better suited for dual-rail generation (±V) in low-current analog systems; lacks voltage-splitting mode. | Select MAX680ESA+ when generating symmetric bipolar supplies is primary requirement and 20 mA suffices. |
| TPS60403DBVR | 1-MHz switching; 60 mA output; integrated soft-start; 2.7–6 V input; 94% peak efficiency. | Higher efficiency and output current ideal for modern low-voltage microcontrollers; no voltage-splitting function. | Choose TPS60403DBVR for newer designs prioritizing efficiency and load headroom over legacy voltage-splitting flexibility. |
Compared with MAX680ESA+ and TPS60403DBVR, the LM2665M6 uniquely supports both voltage doubling and splitting in one device, operates at lower frequency for reduced EMI in noise-sensitive analog systems, and maintains proven reliability in long-lifecycle portable instrumentation.
Availability
LM2665M6 is available at Aetrix Electronics and suitable for portable medical instrumentation, interface power supplies, handheld test equipment, and low-power sensor interfaces requiring stable component supply across extended production lifecycles.
Supply support for LM2665M6 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and digital signal technologies for industrial, automotive, and consumer markets.
The LM2665 belongs to TI's legacy linear power management portfolio, designed specifically for low-noise, inductorless DC-DC conversion in battery-powered portable electronics where size, EMI, and simplicity are critical.
FAQ
What is the maximum input voltage the LM2665M6 can handle in voltage-splitter mode?
The LM2665M6 supports an input voltage range of 1.8 V to 11 V in voltage-splitter configuration, where the input is applied between OUT and GND. This higher limit (versus 5.5 V in doubler mode) arises because internal switches see only half the input voltage, reducing stress on the CMOS array. The absolute maximum rating for OUT-to-GND is 11.6 V, confirming safe operation within the 11 V specification.
Does the LM2665M6 require an external diode in all configurations?
The LM2665M6 requires an external Schottky diode (e.g., 1N5817) only in voltage-doubler mode for startup - it charges the OUT node to >1.8 V to enable the internal oscillator. In voltage-splitter mode, the oscillator is powered directly from OUT–GND, eliminating the need for D1. This simplifies bill-of-materials when using the device solely as a precision divider.
Can multiple LM2665M6 devices be paralleled to increase output current?
Yes, multiple LM2665M6 devices can be paralleled to reduce effective output resistance and increase total output current beyond 40 mA. Each unit requires its own flying capacitor (C1), but a shared output capacitor (C2) suffices. The composite output resistance follows ROUT_total = ROUT / N, where N is the number of paralleled devices - verified in TI's Application Report SNVA229.
What is the purpose of the SD pin on the LM2665M6, and how should it be interfaced?
The SD (Shutdown) pin on the LM2665M6 controls device enable: tying SD to GND enables normal operation; applying >40% of V+ disables the oscillator and reduces supply current to 1 µA typical. For MCU-controlled power gating, connect SD to a GPIO with pull-down resistor - no external level-shifting is needed since the threshold scales with V+.
Is the LM2665M6 RoHS-compliant and suitable for lead-free reflow assembly?
Yes, the LM2665M6X/NOPB.B is RoHS-compliant (lead finish: Sn) and rated for MSL Level-1 at 260°C peak reflow, making it fully compatible with standard lead-free soldering processes. Its SOT-23-6 package has been qualified per JEDEC J-STD-020, and TI provides full reflow profile guidance in the LM2665 packaging addendum.
LM2665M6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
LM2665M6 FAQ
1.How can I place an order for LM2665M6 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2665M6 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 LM2665M6 reliable?
The price and inventory of LM2665M6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2665M6 is usually 5 days.
3.What payment methods are accepted for LM2665M6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2665M6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2665M6?
LM2665M6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2665M6 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 LM2665M6?
For technical support, including LM2665M6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2665M6 requirements.
6.How does Aetrix verify that LM2665M6 is sourced from the original manufacturer or authorized distributors?
All LM2665M6 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 LM2665M6 meets industry standards.
7.What is the process for return or replacement of LM2665M6?
All LM2665M6 units undergo pre-shipment inspection (PSI). If there is an issue with LM2665M6, 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 LM2665M6 part is unused and in its original packaging.
Return procedure for LM2665M6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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