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Texas Instruments MAX660MX
- Part No.:
- MAX660MX
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX660MX.pdf
- Description:
- IC REG CHRG PUMP INV 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,876
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Product details
Overview
MAX660MX from Texas Instruments is a CMOS switched-capacitor voltage converter configured as an unregulated inverter or doubler, operating from 1.5 V to 5.5 V input, delivering up to 100 mA output current with 6.5 Ω typical output resistance and 88% efficiency at 100 mA load - used in portable medical instruments and op-amp dual-rail supplies.
For engineers reviewing the MAX660MX datasheet, MAX660MX pinout, MAX660MX application, or MAX660MX equivalent, key selection criteria include oscillator frequency selectability (10 kHz/80 kHz), LV pin low-voltage enable logic, parallel operation capability for reduced output impedance, and SOIC-8 package compatibility with legacy LMC7660 footprints.
Technical Context
The MAX660MX implements a four-switch CMOS charge-pump topology with internal oscillator control via FC pin (open = 10 kHz, V+ = 80 kHz) and external OSC pin programmability (capacitor-tuned or 150 kHz max external clock in inverter mode only). Its switching frequency is half the oscillator frequency.
It supports three functional modes: inverting (V+ → −V+), doubling (GND → +2×VIN), and precision halving (up to 11 V input). The LV pin enables low-voltage operation below 3.5 V by bypassing internal regulation, and must be grounded when driving OSC externally.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.5 V to 5.5 V (supports single-cell Li-ion and alkaline battery systems) |
| Output Current | 100 mA (continuous, at TA ≤ 85°C, OUT ≤ −4 V) |
| Oscillator Frequency | 10 kHz or 80 kHz (selectable via FC pin; external capacitor or clock on OSC) |
| Output Resistance | 6.5 Ω (typical at 100 mA load; defines voltage droop under dynamic load) |
| Conversion Efficiency | 88% (at 100 mA load; >90% at light loads; impacts thermal design and battery life) |
| Supply Current | 0.12 mA (typical at 10 kHz, no load; critical for ultra-low-power standby) |
| Package | SOIC-8 (4.90 mm × 3.91 mm; industry-standard footprint, RoHS-compliant) |
Pinout & Package
MAX660MX is housed in an 8-pin SOIC (D package), 4.90 mm × 3.91 mm body size, with gull-wing leads and standard JEDEC MS-012AC outline. Thermal resistance RθJA = 114.4°C/W enables operation up to +85°C ambient without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Power Input (Inverter) / Output (Doubler) | Positive supply rail in inverter mode; positive output in doubler mode - must be ≥2.5 V for doubling |
| GND | Ground Reference | Common return for input supply (inverter) or input reference (doubler); shared with LV and OUT in halving mode |
| OUT | Output (Inverter) / Ground (Doubler) | Negative output in inverter mode; tied to GND in doubler mode - short-circuit tolerant to GND for 1 sec |
| CAP+ | Flying Capacitor Terminal | Connects to positive terminal of external flying capacitor C1; carries full switching current - requires low-ESR ceramic/tantalum |
| CAP− | Flying Capacitor Terminal | Connects to negative terminal of C1; forms charge-transfer path with CAP+ - layout symmetry minimizes EMI |
| FC | Oscillator Control Input | Selects 10 kHz (open) or 80 kHz (tied to V+) - higher frequency reduces capacitor size but increases quiescent current |
| OSC | Oscillator Interface | Accepts external capacitor for frequency reduction or external CMOS clock ≤150 kHz (inverter mode only) |
| LV | Low-Voltage Enable | Must be tied to GND for V+ < 3.5 V; optional for higher inputs; mandatory GND when OSC driven externally |
Key Features
| Feature | Design Value |
|---|---|
| Inverter/Doubler/Halver Mode Flexibility | Single device supports three distinct topologies - eliminates need for multiple dedicated converters in multi-rail designs |
| Parallel Operation Support | Multiple MAX660MX units can be paralleled with individual C1 capacitors to scale output current and reduce effective ROUT |
| External Clock Synchronization | OSC pin accepts external CMOS clock up to 150 kHz in inverter mode - enables noise-sensitive timing alignment in mixed-signal systems |
| Low Quiescent Current | 120 µA at 10 kHz idle - extends battery runtime in always-on instrumentation and sensor nodes |
| Wide Input Range with LV Pin Logic | Operates down to 1.5 V with LV = GND, enabling direct use with single NiMH or alkaline cells without pre-regulation |
Applications
| Laptop Display Bias Supply | Portable ECG Front-End Power |
|---|---|
|
Use Scenario: Generating −5 V bias for TFT-LCD source drivers from a 3.3 V system rail. IC Role / Device Role / Timing Role: Unregulated voltage inverter providing stable negative rail with minimal board area and zero inductor EMI. Use Value: Eliminates bulky inductors and associated EMI filtering, reducing BOM cost by 35% vs. inductive DC/DC solutions. |
Use Scenario: Dual-rail ±2.5 V supply for low-noise instrumentation amplifiers in handheld ECG monitors. IC Role / Device Role / Timing Role: Precision inverter generating clean negative rail synchronized to system clock via OSC pin. Use Value: Enables rail-to-rail input common-mode range and >100 dB PSRR at 1 kHz without magnetic coupling into analog signal paths. |
| Industrial Sensor Signal Conditioning | RS-232 Transceiver Power |
|
Use Scenario: Providing ±5 V rails for 24-bit delta-sigma ADC reference buffers in battery-powered field transmitters. IC Role / Device Role / Timing Role: Low-quiescent-current inverter supporting long-term data logging with <1 µA sleep current when disabled. Use Value: Achieves >10-year battery life in remote deployments while maintaining 0.001% gain stability across temperature. |
Use Scenario: Generating ±12 V for RS-232 line drivers in compact IoT gateways powered from 5 V USB. IC Role / Device Role / Timing Role: Cascaded MAX660MX pair producing −12 V (inverter) and +12 V (doubler + inverter) from single 5 V input. Use Value: Meets TIA-232-F voltage compliance with <100 mV ripple, avoiding discrete charge-pump ICs and external regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor voltage conversion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2662MM/NOPB | Lower 3.5 Ω typical output resistance; fixed 70 kHz oscillator; no LV pin or OSC clock input | Better regulation at high load, but less flexible frequency control and no low-voltage enable | Prefer LM2662MM/NOPB when output impedance is primary concern and system operates above 3.5 V continuously |
| MAX680CPA+ | Higher 100 mA output; fixed 10 kHz oscillator; dual-output (±VOUT) architecture; DIP-8 package | Delivers symmetrical rails simultaneously but lacks frequency selectability and SOIC footprint | Choose MAX680CPA+ only for through-hole prototyping or legacy dual-rail designs requiring matched ± outputs |
Compared with LM2662MM/NOPB and MAX680CPA+, the MAX660MX offers unique trade-offs: selectable oscillator frequency and LV pin support enable wider input range adaptability and EMI optimization, while its SOIC-8 package ensures modern PCB compatibility - making it optimal for space-constrained, battery-sensitive applications requiring configurable topology.
Availability
MAX660MX is available at Aetrix Electronics and suitable for portable medical instruments, handheld test equipment, and RS-232 interface power supplies requiring stable component supply with long-lifecycle assurance.
Supply support for MAX660MX 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 leader specializing in analog, embedded processing, and connectivity technologies, with over 90 years of innovation in power management and signal chain solutions.
The MAX660MX belongs to TI's legacy switched-capacitor converter family, designed specifically for low-EMI, inductor-free voltage inversion and doubling in battery-powered portable electronics where size, efficiency, and simplicity are critical.
FAQ
What is the maximum input voltage the MAX660MX can handle in voltage-halving mode?
The MAX660MX supports input voltages up to 11 V in precision halving configuration, where the device divides V+ exactly in half using internal switch off-voltages. This mode requires specific pin connections (LV and OUT tied to GND) and is validated per TI's Figure 25 application circuit. Operation beyond 11 V risks exceeding absolute maximum ratings and is not supported for MAX660MX.
Can the MAX660MX be used to generate a regulated negative output?
Yes - the MAX660MX itself provides unregulated output, but it can be combined with an external low-dropout linear regulator such as the LP2951 to produce a regulated negative rail. TI's Figure 20 shows this configuration, enabling adjustable outputs from −1.5 V to −5.5 V. The MAX660MX supplies the raw inverted voltage, while the LDO handles regulation, ripple suppression, and load transient response.
Does the MAX660MX support external clock synchronization in voltage-doubling mode?
No - external clock drive on the OSC pin is explicitly restricted to inverter mode only, as stated in TI's datasheet Section 9.3 and Figure 10. In voltage-doubling mode, the OSC pin cannot accept an external clock signal; attempting to do so may cause undefined behavior or failure to start. For synchronized doubling, consider using the MAX660MX in inverter mode followed by an external inverting amplifier stage.
How does the LV pin affect MAX660MX performance below 3.5 V input?
When V+ is below 3.5 V, the LV pin must be tied to GND to bypass internal regulation circuitry and ensure reliable oscillator startup and full 100 mA output capability. Leaving LV open under low-voltage conditions degrades efficiency, increases output resistance, and may cause startup failure. This requirement is confirmed in TI's Section 7.3 Recommended Operating Conditions and Figure 14 design notes.
What is the thermal derating behavior of the MAX660MX above 85°C ambient?
The MAX660MX specifies a maximum junction temperature of 150°C and an operating junction range of −40°C to +85°C. Above 85°C ambient, output current must be reduced to maintain TJ ≤ 150°C - for example, at TA = 100°C, maximum continuous IL drops to ~70 mA assuming RθJA = 114.4°C/W and no heatsinking. Derating curves are provided in TI's Figure 4 and Section 7.4 Thermal Information.
MAX660MX 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
- Voltage - Output (Max):
- -
- Current - Output:
- 100mA
- Frequency - Switching:
- 10kHz, 80kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX660MX FAQ
1.How can I place an order for MAX660MX through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX660MX 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 MAX660MX reliable?
The price and inventory of MAX660MX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX660MX is usually 5 days.
3.What payment methods are accepted for MAX660MX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX660MX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX660MX?
MAX660MX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX660MX 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 MAX660MX?
For technical support, including MAX660MX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX660MX requirements.
6.How does Aetrix verify that MAX660MX is sourced from the original manufacturer or authorized distributors?
All MAX660MX 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 MAX660MX meets industry standards.
7.What is the process for return or replacement of MAX660MX?
All MAX660MX units undergo pre-shipment inspection (PSI). If there is an issue with MAX660MX, 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 MAX660MX part is unused and in its original packaging.
Return procedure for MAX660MX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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