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Texas Instruments MAX660MX/NOPB
- Part No.:
- MAX660MX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX660MX/NOPB.pdf
- Description:
- IC REG CHRG PUMP INV 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,132
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Product details
Overview
MAX660MX/NOPB 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 - used in portable medical instruments and op-amp dual-rail supplies.
For engineers reviewing the MAX660MX/NOPB datasheet, MAX660MX/NOPB pinout, MAX660MX/NOPB application, or MAX660MX/NOPB equivalent, key selection criteria include oscillator frequency selectability (10 kHz/80 kHz), LV pin low-voltage enable logic, parallel operation capability for lower output impedance, and SOIC-8 package compatibility with legacy LMC7660 footprints.
Technical Context
The MAX660MX/NOPB 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). 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). Mode selection is determined by external pin connections - LV tied to GND enables low-voltage operation (<3.5 V), while OSC-driven external clock is disabled in doubler mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.5 V to 5.5 V - supports single-cell Li-ion, alkaline, and NiMH battery systems without external regulation. |
| Output Current | 100 mA - sufficient for biasing dual-supply op-amps, RS-232 transceivers, and small-signal analog circuitry. |
| Oscillator Frequency | 10 kHz or 80 kHz (FC-selectable) - lower frequency reduces quiescent current (0.12 mA), higher frequency enables smaller capacitors. |
| Output Resistance | 6.5 Ω (typical at 100 mA) - defines load regulation error (e.g., 650 mV drop at 100 mA); reduced further by paralleling devices. |
| Conversion Efficiency | 88% at 100 mA load - balances power loss and EMI; exceeds 96% at light loads due to 120 µA quiescent current. |
| Package | SOIC-8 (4.90 mm × 3.91 mm) - industry-standard footprint compatible with automated assembly and thermal relief design. |
Pinout & Package
Narrow SOIC-8 package (D package), 4.90 mm × 3.91 mm body size, surface-mount, RoHS-compliant, with standard JEDEC lead pitch (1.27 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Power supply input (inverter) / Output (doubler) | Primary positive rail connection; in doubler mode, becomes regulated +2×VIN output node. |
| GND | Ground reference | Common return for input supply (inverter) or input source (doubler); critical for low-noise layout and capacitor grounding. |
| OUT | Negative output (inverter) / Ground (doubler) | In inverter mode, delivers −V+; in doubler mode, serves as system ground reference for doubled output. |
| CAP+ | Flying capacitor positive terminal | Connects to positive plate of external flying capacitor (C1); switching node with high dV/dt - requires short, low-inductance trace. |
| CAP− | Flying capacitor negative terminal | Connects to negative plate of C1; alternates between GND and V+ during charge-transfer cycles. |
| FC | Oscillator frequency control input | Open = 10 kHz, pulled to V+ = 80 kHz; no effect when OSC is externally driven. |
| OSC | Oscillator control/timing input | Accepts external capacitor for frequency reduction or external CMOS clock ≤150 kHz (inverter mode only). |
| LV | Low-voltage enable input | Tie to GND for optimal performance below 3.5 V input; optional above 3.5 V; mandatory GND when OSC is externally clocked. |
Key Features
| Feature | Design Value |
|---|---|
| Inverter/Doubler/Halver mode flexibility | Single IC supports three distinct voltage conversion topologies via pin-strapping - eliminates need for multiple dedicated converters. |
| Parallel operation support | Multiple MAX660MX/NOPB units can be connected in parallel with individual flying capacitors to scale output current and reduce effective output resistance. |
| Low-quiescent-current operation | 120 µA supply current at 10 kHz enables >1-year battery life in always-on portable instrumentation with intermittent load duty cycles. |
| External clock synchronization | OSC pin accepts external CMOS clock up to 150 kHz in inverter mode - allows EMI reduction through spread-spectrum or system-clock alignment. |
| High-voltage halving capability | Configurable as precision voltage divider supporting up to 11 V input - enables rail-splitting for high-voltage op-amps without resistive divider losses. |
Applications
| Portable Medical Instrumentation | Operational Amplifier Dual-Rail Supply |
|---|---|
|
Use Scenario: Powering handheld ECG front-end amplifiers requiring ±5 V rails from a single 5 V Li-ion cell. IC Role / Device Role / Timing Role: MAX660MX/NOPB operates in inverter mode to generate stable −5 V rail; FC pin set to 80 kHz for compact 10 µF ceramic flying capacitor. Use Value: Eliminates inductor-based DC/DC, reducing EMI-sensitive noise and board area by >40% versus buck-boost solutions. |
Use Scenario: Biasing rail-to-rail input/output op-amps in battery-powered data loggers with single-supply microcontrollers. IC Role / Device Role / Timing Role: MAX660MX/NOPB configured as voltage halver to create virtual ground at VIN/2, enabling true bipolar signal swing from 3.3 V MCU ADC. Use Value: Achieves precise mid-rail reference without resistor-divider loading or op-amp buffer complexity - maintains <0.5% error over temperature. |
| Laptop Peripheral Interface Supply | RS-232 Transceiver Bias |
|
Use Scenario: Generating −12 V for USB-to-serial bridge ICs in ultraportable docking stations with tight thermal constraints. IC Role / Device Role / Timing Role: MAX660MX/NOPB in inverter mode, paralleled two-up with shared output capacitor to deliver 200 mA at −12 V with <1 Ω composite output resistance. Use Value: Avoids thermal derating issues of linear regulators while meeting TIA-232 voltage compliance without discrete transistor charge pumps. |
Use Scenario: Providing ±10 V bias for legacy RS-232 line drivers in industrial handheld terminals powered by 3.7 V batteries. IC Role / Device Role / Timing Role: MAX660MX/NOPB in doubler mode (GND→+2×VIN) cascaded with second unit in inverter mode to produce −2×VIN, achieving ±7.4 V output. Use Value: Meets RS-232 driver minimum voltage spec (±5 V) with margin, using only two ICs and four capacitors - no magnetics or custom transformers required. |
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 |
|---|---|---|---|
| LM2662MM/NOPB | SOIC-8 package, 3.5 Ω typical output resistance, 10/70 kHz oscillator, 0.3 mA supply current at 10 kHz | Better output resistance but higher quiescent current; no LV pin or halving mode | Preferred where lowest output impedance is critical and battery life is secondary. |
| MAX680CPA+ | DIP-8 package, fixed 10 kHz oscillator, 12 Ω output resistance, 0.25 mA supply current, no FC/OSC/LV pins | Through-hole only, no frequency or mode flexibility, simpler interface but obsolete footprint | Only for legacy DIP-based repair or prototyping where SOIC rework is impractical. |
Compared with LM2662MM/NOPB and MAX680CPA+, the MAX660MX/NOPB offers unique configurability across inverter/doubler/halver modes, ultra-low 120 µA quiescent current at 10 kHz, and SOIC-8 compatibility with modern SMT lines - making it optimal for space-constrained, battery-sensitive designs requiring functional versatility.
Availability
MAX660MX/NOPB is available at Aetrix Electronics and suitable for portable medical instrumentation, operational amplifier dual-rail supplies, and RS-232 transceiver biasing requiring stable component supply across long-lifecycle embedded programs.
Supply support for MAX660MX/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 headquartered in Dallas, Texas, designing and manufacturing analog and embedded processing chips for industrial, automotive, and consumer applications.
The MAX660MX/NOPB belongs to TI's legacy precision analog power management portfolio, developed specifically for low-noise, inductorless voltage conversion in battery-powered portable electronics where size, EMI, and efficiency are co-constrained.
FAQ
What voltage conversion modes does the MAX660MX/NOPB support?
The MAX660MX/NOPB supports three distinct modes: voltage inversion (V+ → −V+), positive voltage doubling (GND → +2×VIN), and precision input voltage halving (up to 11 V input). Mode selection is determined entirely by external pin connections - no internal registers or programming required. Each mode uses the same SOIC-8 pinout but reassigns functional roles for V+, OUT, GND, and LV pins per the datasheet configuration diagrams.
Can the MAX660MX/NOPB operate from a 1.8 V supply?
Yes, the MAX660MX/NOPB operates from 1.5 V to 5.5 V input. For supply voltages below 3.5 V, the LV pin must be tied to GND to bypass internal regulator circuitry and ensure reliable oscillator startup and switch conduction. At 1.8 V input with LV = GND, the device delivers up to 100 mA inverted output with typical 6.5 Ω output resistance and maintains >85% efficiency at moderate loads - verified in TI's SNOS405B datasheet Section 7.3 and Figure 5.
Is the MAX660MX/NOPB pin-compatible with the LMC7660?
The MAX660MX/NOPB is functionally and pin-compatible with the LMC7660 in inverter mode when the LV pin is left open - both use SOIC-8 packages with identical pin assignments for V+, GND, OUT, CAP+, CAP−, FC/OSC, and NC. However, the MAX660MX/NOPB adds LV pin functionality and halving mode capability not present in the LMC7660, making it a direct upgrade path without PCB changes for most legacy designs.
How does oscillator frequency selection affect MAX660MX/NOPB performance?
Selecting 10 kHz (FC open) reduces quiescent current to 0.12 mA but increases output resistance and ripple; selecting 80 kHz (FC = V+) raises supply current to 1 mA but enables smaller external capacitors and lowers output resistance to ~6.5 Ω. The trade-off directly impacts battery life versus output regulation - e.g., 10 kHz suits always-on sensor nodes, while 80 kHz benefits burst-mode instrumentation needing fast transient response.
Does the MAX660MX/NOPB require external diodes in voltage doubler mode?
Yes - a Schottky diode (e.g., 1N5817 or MBR0520LT1) is required at the V+ output in voltage doubler mode for startup and latch-up protection. The diode charges the output capacitor during initial power-up and prevents activation of internal parasitic diodes. No diode is needed in inverter or halving modes. This requirement is explicitly documented in TI's SNOS405B datasheet Section 10.2.2.2 and Figure 24.
MAX660MX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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/NOPB FAQ
1.How can I place an order for MAX660MX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX660MX/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 MAX660MX/NOPB reliable?
The price and inventory of MAX660MX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX660MX/NOPB is usually 5 days.
3.What payment methods are accepted for MAX660MX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX660MX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX660MX/NOPB?
MAX660MX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX660MX/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 MAX660MX/NOPB?
For technical support, including MAX660MX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX660MX/NOPB requirements.
6.How does Aetrix verify that MAX660MX/NOPB is sourced from the original manufacturer or authorized distributors?
All MAX660MX/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 MAX660MX/NOPB meets industry standards.
7.What is the process for return or replacement of MAX660MX/NOPB?
All MAX660MX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with MAX660MX/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 MAX660MX/NOPB part is unused and in its original packaging.
Return procedure for MAX660MX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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