My Inquiry
My Account
Texas Instruments LM2660MX
- Part No.:
- LM2660MX
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2660MX.pdf
- Description:
- IC REG CHRG PUMP INV 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,885
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2660MX from Texas Instruments is a CMOS switched-capacitor voltage converter configured as an unregulated inverter or doubler, delivering up to 100 mA output current with 6.5 Ω typical output resistance and 88% conversion efficiency at full load. It operates from 1.5 V to 5.5 V input, supports selectable 10 kHz/80 kHz oscillator frequency via FC pin, and is used in portable medical instruments and operational amplifier dual-rail power supplies.
For engineers reviewing the LM2660MX datasheet, LM2660MX pinout, LM2660MX application, or LM2660MX equivalent, key selection criteria include its SOIC-8 package compatibility, LV pin configuration for low-voltage operation (≤3.5 V), OSC pin flexibility for external clocking (inverter mode only), and parallel/cascading capability for higher current or extended voltage range.
Technical Context
The LM2660MX implements a four-switch charge-pump topology with CMOS internal switches driven by an adjustable oscillator. Its functional modes-voltage inversion (V+ → −V+) and voltage doubling (GND → +2×VIN)-are determined by external pin connections, not internal register settings. The FC pin selects nominal oscillator frequencies of 10 kHz (open) or 80 kHz (tied to V+), directly controlling switching frequency (fSW = fOSC/2) and thus output impedance and ripple performance.
In inverter mode, the OSC pin accepts external clocks up to 150 kHz or external capacitors for frequency trimming; in doubler mode, OSC cannot be externally driven. The LV pin enables low-voltage operation below 3.5 V by bypassing internal regulation circuitry-when LV = GND, minimum V+ drops to 1.5 V; when LV = OUT, V+ must be ≥2.5 V for doubling operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5 V to 5.5 V (LV = GND); enables single-cell Li-ion or alkaline battery operation without boost stage |
| Output Current | 100 mA (TA ≤ 85°C); sufficient for dual-rail op-amp biasing or interface level-shifting loads |
| Oscillator Frequency | 10 kHz or 80 kHz (FC-selectable); higher frequency allows smaller external capacitors and lower output impedance |
| Output Resistance | 6.5 Ω typical (IL = 100 mA); defines voltage drop under load and limits maximum usable current |
| Conversion Efficiency | 88% typical at 100 mA; reduces thermal load and extends battery life in portable systems |
| Quiescent Current | 120 µA typical (FC = open); critical for always-on or low-power standby circuits |
| Package | SOIC-8 (4.90 mm × 3.91 mm); industry-standard footprint compatible with automated assembly and legacy designs |
Pinout & Package
LM2660MX is packaged in an 8-pin SOIC (D) body measuring 4.90 mm × 3.91 mm, with standard JEDEC-compliant lead finish (Sn) and MSL Level-1 rating for unlimited reflow exposure.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - FC | Oscillator frequency control input | Open = 10 kHz; tied to V+ = 80 kHz; no effect when OSC is externally driven |
| 2 - CAP+ | Positive flying capacitor terminal | Connects to positive plate of charge-transfer capacitor C1; carries high-frequency switching current |
| 3 - GND | Power supply ground reference | Primary return path for input, output, and internal oscillator; must be low-inductance connection |
| 4 - CAP− | Negative flying capacitor terminal | Connects to negative plate of C1; forms charge-transfer loop with CAP+ and internal switches |
| 5 - OUT | Inverter output / Doubler ground | In inverter mode: negative voltage output (−V+); in doubler mode: connected to system ground |
| 6 - LV | Low-voltage enable input | Tie to GND for V+ ≥1.5 V operation; leave open or tie to GND for V+ ≥3.5 V; must tie to OUT in doubler mode |
| 7 - OSC | Oscillator control input | Accepts external clock (≤150 kHz, inverter mode only) or external capacitor for frequency adjustment |
| 8 - V+ | Positive supply input / Doubler output | In inverter mode: positive input rail; in doubler mode: positive output rail (+2×VIN) |
Key Features
| Feature | Design Value |
|---|---|
| Configurable topology | Hardware-selectable inverter or doubler via pin wiring-no external logic or firmware required |
| Parallel operation support | Multiple LM2660MX units can share one output capacitor while using individual flying capacitors to halve effective output resistance |
| External clock interface | OSC pin accepts CMOS-level external clock up to 150 kHz in inverter mode, enabling synchronization with system timing |
| Low-voltage enable | LV pin allows reliable startup and regulation down to 1.5 V input, eliminating need for auxiliary bias rails |
| Cascadable architecture | Multiple devices can be cascaded to generate −n×V+ or +n×V+ outputs (e.g., −3V+ or +3V+) with predictable composite output resistance |
Applications
| Portable Medical Instrument Power | Op-Amp Dual-Rail Bias Supply |
|---|---|
|
Use Scenario: Powering handheld ECG or glucose meter analog front-ends requiring ±2.5 V rails from a single 3.3 V Li-ion cell. IC Role / Device Role / Timing Role: LM2660MX acts as negative rail generator, inverting 3.3 V to −3.3 V while maintaining low noise and stable regulation under dynamic load. Use Value: Eliminates need for inductor-based DC/DC converters, reducing EMI, board area, and BOM cost in space-constrained medical enclosures. |
Use Scenario: Providing symmetrical ±5 V supplies for precision instrumentation amplifiers in data acquisition modules. IC Role / Device Role / Timing Role: LM2660MX functions as unregulated inverter, generating −5 V from +5 V input; FC pin set to 80 kHz to minimize output impedance. Use Value: Achieves <6.5 Ω output resistance and <100 mV ripple at 50 mA load, enabling stable op-amp common-mode range and PSRR performance. |
| Cellular Phone Interface Power | Laptop Peripheral Rail Generation |
|
Use Scenario: Generating −3 V bias for RF switch control or analog audio codec level-shifting in 3G/4G handset designs. IC Role / Device Role / Timing Role: LM2660MX operates in inverter mode with LV = GND, supporting 2.7 V–3.6 V battery input and delivering clean negative rail during burst transmission. Use Value: 120 µA quiescent current extends standby time; 88% efficiency minimizes thermal impact near sensitive RF sections. |
Use Scenario: Creating isolated −12 V rail for legacy RS-232 transceivers or smart card readers embedded in ultrabook docking stations. IC Role / Device Role / Timing Role: LM2660MX configured in cascaded inverter mode (two units) to generate −12 V from +5 V USB input. Use Value: Cascading yields −10 V at 30 mA with <15 Ω composite output resistance-sufficient for RS-232 driver compliance without discrete regulators. |
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 10 kHz oscillator; no FC pin or external clock option; 120 mA output; 8-pin SOIC package | Less flexible frequency control; no LV pin for sub-3.5 V operation; identical inverter-only functionality | Select MAX680ESA+ when fixed-frequency, lowest-quiescent-current (80 µA) inverter is sufficient and external clock sync is unnecessary |
| TPS60403DBVR | Regulated inverter output (±0.5%); 60 mA max; 5-pin SOT-23; integrated soft-start; 1 MHz switching | Provides regulated output but lower current and no doubler mode; requires different layout and capacitor selection | Select TPS60403DBVR when precise output voltage stability is mandatory and load current ≤60 mA |
Compared with MAX680ESA+ and TPS60403DBVR, the LM2660MX offers unique configurability between inverter/doubler topologies, hardware-selectable oscillator frequency, and support for both low-voltage (1.5 V) and high-current (100 mA) operation-making it optimal for cost-sensitive, multi-rail portable systems where regulation is handled downstream.
Availability
LM2660MX is available at Aetrix Electronics and suitable for portable medical instruments, cellular phone interface power, laptop peripheral rail generation, and operational amplifier dual-rail bias supplies requiring stable component supply across long-lifecycle industrial and consumer programs.
Supply support for LM2660MX 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 and embedded processing technologies, with leadership in power management, signal chain, and high-reliability IC design.
The LM2660MX belongs to TI's legacy switched-capacitor converter product line, engineered for low-EMI, inductorless DC/DC conversion in battery-powered portable electronics where size, cost, and simplicity are critical.
FAQ
What is the minimum input voltage supported by the LM2660MX?
The LM2660MX supports a minimum input voltage of 1.5 V when the LV pin is tied to GND. This configuration bypasses internal regulation circuitry, enabling direct operation from single-cell alkaline or lithium primary batteries. At input voltages above 3.5 V, the LV pin may be left open or grounded without affecting functionality. The LM2660MX datasheet specifies this behavior under Recommended Operating Conditions, with guaranteed 100 mA output current down to 1.5 V input.
Can the LM2660MX be used as a voltage doubler, and what are the pin requirements?
Yes, the LM2660MX can operate as a voltage doubler by reconfiguring pin connections: GND becomes the input node (2.5 V–5.5 V), V+ becomes the positive output, OUT and LV are tied to GND, and CAP+ and CAP− retain their flying capacitor roles. In this mode, the unloaded output is +2×VIN, and the OSC pin cannot accept external clock signals. A Schottky diode (e.g., 1N5817) is required at startup to ensure reliable oscillator initialization. This configuration is explicitly documented in Section 9.2.2 of the LM2660MX datasheet.
Does the LM2660MX support external clock synchronization, and under what conditions?
The LM2660MX supports external clock synchronization only in voltage inverter mode, applied to the OSC pin. The external clock must swing within 100 mV of V+ and GND, be CMOS-compatible, and not exceed 150 kHz. The LV pin must be tied to GND during external clock operation. This capability is disabled in voltage doubler mode per datasheet Section 8.3.1. External clocking enables timing alignment with system clocks or noise spectrum shaping-critical in mixed-signal portable devices where switching harmonics must avoid sensitive bands.
How does paralleling multiple LM2660MX devices affect output performance?
Paralleling multiple LM2660MX devices reduces composite output resistance proportionally: two units yield ~3.25 Ω typical, three units ~2.17 Ω, assuming matched components and proper layout. Each device requires its own flying capacitor (C1), while a single shared output capacitor (C2) suffices. This technique maintains 100 mA per unit capability while increasing total available current and improving load regulation. The LM2660MX datasheet confirms this behavior in Section 9.2.1.2.2, noting that paralleling preserves efficiency and does not require inter-device synchronization.
What is the role of the FC pin on the LM2660MX, and how does it affect efficiency?
The FC pin on the LM2660MX selects the internal oscillator frequency: open = 10 kHz (typ), tied to V+ = 80 kHz (typ). Higher frequency reduces output impedance and ripple but increases quiescent current from 120 µA to 1 mA. At 100 mA load, 80 kHz operation improves voltage regulation (lower drop) but slightly reduces peak efficiency (88% vs. 92% at light loads). The trade-off is explicit in Electrical Characteristics Table 6.5 and Typical Characteristics Figures 2 and 6, making FC a key design lever for balancing output fidelity versus battery runtime.
LM2660MX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Ratiometric
- Output Configuration:
- Positive or Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin, Vin/2
- Voltage - Output (Max):
- -
- Current - Output:
- 100mA
- Frequency - Switching:
- 5kHz, 40kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM2660MX FAQ
1.How can I place an order for LM2660MX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2660MX 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 LM2660MX reliable?
The price and inventory of LM2660MX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2660MX is usually 5 days.
3.What payment methods are accepted for LM2660MX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2660MX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2660MX?
LM2660MX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2660MX 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 LM2660MX?
For technical support, including LM2660MX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2660MX requirements.
6.How does Aetrix verify that LM2660MX is sourced from the original manufacturer or authorized distributors?
All LM2660MX 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 LM2660MX meets industry standards.
7.What is the process for return or replacement of LM2660MX?
All LM2660MX units undergo pre-shipment inspection (PSI). If there is an issue with LM2660MX, 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 LM2660MX part is unused and in its original packaging.
Return procedure for LM2660MX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2660MX Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
