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Analog Devices Inc./Maxim Integrated MAX1697REUT+T
- Part No.:
- MAX1697REUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1697REUT+T.pdf
- Description:
- IC REG CHARGE PUMP INV 60MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:3,102
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Product details
Overview
MAX1697REUT+T from Maxim Integrated is a monolithic CMOS inverting charge-pump DC-DC converter in a 6-pin SOT23 package, delivering up to 60mA output current with 12Ω typical output resistance. It accepts 1.25V–5.5V input and generates -1×VIN output voltage, optimized for low-noise analog supply generation from +3.3V or +5V logic rails in space-constrained portable systems.
For engineers reviewing the MAX1697REUT+T datasheet, MAX1697REUT+T pinout, MAX1697REUT+T application, or MAX1697REUT+T equivalent, key selection criteria include its 12kHz oscillator frequency, shutdown quiescent current of 2nA, thermal shutdown at +150°C, and compatibility with 1µF ceramic flying/output capacitors-critical for battery-powered LCD bias and GaAsFET applications.
Technical Context
The MAX1697REUT+T implements a two-phase switched-capacitor inverter topology with integrated power MOSFETs (S1–S4), where C1 charges during phase one and discharges into C2 during phase two to generate inverted output. Its fixed 12kHz switching frequency minimizes EMI while enabling use of small external components.
Internal circuitry includes slew-rate-limited drivers to reduce radiated emissions, start-up current limiting (170mA typ) to protect weak input sources, and active ground pull-down (3Ω) on OUT during shutdown. Thermal shutdown engages at +150°C with 15°C hysteresis, ensuring robust fault protection without external supervision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 60mA maximum continuous load-supports analog front-ends and RF bias circuits requiring stable negative rail. |
| Output Resistance | 12Ω typical-determines output voltage droop under load; enables ≤120mV drop at 60mA. |
| Oscillator Frequency | 12kHz-low-frequency operation reduces capacitor ESR sensitivity and eases EMI filtering. |
| Input Voltage Range | +1.25V to +5.5V-enables direct operation from single-cell Li-ion, alkaline, or logic supplies. |
| Shutdown Supply Current | 2nA-preserves battery life in always-on portable devices during standby. |
| Thermal Shutdown Threshold | +150°C with 15°C hysteresis-prevents latch-up during sustained overload or poor PCB thermal design. |
| Voltage Conversion Ratio | -1×VIN-provides precise inverted rail matching input magnitude, ideal for op-amp dual-supply setups. |
Pinout & Package
Package: 6-pin SOT23 (U6F-6), 1.6mm × 2.9mm footprint, RoHS-compliant lead-free construction with '+' pin-1 indicator.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1+ | Positive terminal of flying capacitor | Connects to high-side switch node; requires low-ESR ceramic capacitor (e.g., 1µF X7R). |
| OUT | Inverting charge-pump output | Delivers regulated negative voltage; actively pulled to GND via 3Ω during shutdown. |
| IN | Power-supply input | Accepts 1.25V–5.5V; internal current limiting protects weak sources during startup. |
| C1- | Negative terminal of flying capacitor | Completes charge-transfer path; must be routed with minimal loop area for low EMI. |
| GND | Analog/digital ground reference | Single ground plane required; ties internal switches and shutdown circuitry. |
| SHDN | Logic-controlled shutdown input | High = normal operation; low = 2nA shutdown with active OUT pull-down. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low output resistance | 12Ω typical enables 60mA delivery with <120mV droop-critical for precision analog biasing. |
| Slew-rate limited drivers | Reduces high-frequency EMI generation, easing compliance in handheld medical and test equipment. |
| Start-up current limiting | 170mA max prevents brownout of alkaline cells or high-impedance LDOs during power-on. |
| Micropower shutdown mode | 2nA supply current extends battery life in PDAs and portable instrumentation between measurements. |
| Thermal shutdown protection | +150°C trip with 15°C hysteresis avoids destructive thermal runaway during sustained overload. |
Applications
| Small LCD Panels | GaAsFET Bias Supplies |
|---|---|
Use Scenario: Generating negative gate bias for STN/TN LCD segment drivers in handheld meters and industrial HMIs. IC Role / Device Role / Timing Role: Inverting charge pump providing stable -3.3V from +3.3V logic rail with minimal ripple. Use Value: Enables compact single-supply LCD systems without discrete inductors or transformers. | Use Scenario: Supplying negative gate voltage for GaAs FET amplifiers in GPS receivers and satellite modems. IC Role / Device Role / Timing Role: Low-noise inverter delivering -5V from +5V supply with 12kHz switching to avoid RF band interference. Use Value: Eliminates need for bulky inductive DC-DC converters while meeting stringent EMI limits. |
| Handheld Terminals | Battery-Operated Equipment |
Use Scenario: Powering RS-232 transceivers and op-amp signal conditioning in ruggedized field terminals. IC Role / Device Role / Timing Role: Dual-rail generator producing ±3.3V from single 3.6V Li-ion cell using cascaded configuration. Use Value: Supports full-duplex serial communication without external inductors or complex layout. | Use Scenario: Providing clean negative supply for audio codec biasing in wireless headphones and portable audio recorders. IC Role / Device Role / Timing Role: Micropower inverter operating from 1.5V alkaline cells with 2nA shutdown current. Use Value: Extends playback time by >20% versus higher-quiescent alternatives in intermittent-use devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting charge-pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1697SEUT+T | 35kHz oscillator frequency; 17Ω output resistance; 300µA quiescent current | Better suited for applications requiring smaller external capacitors and faster wake-up time (70µs) | Select when board space is constrained and EMI filtering is less critical than capacitor size. |
| MAX1697TEUT+T | 125kHz oscillator frequency; 17Ω output resistance; 650µA quiescent current | Enables lowest possible capacitor values (0.47µF) but increases EMI susceptibility and supply current | Choose for ultra-compact designs where 125kHz noise can be filtered and battery life is secondary to size. |
Compared with MAX1697REUT+T, the MAX1697SEUT+T offers faster transient response and smaller capacitors at the cost of higher quiescent current, while the MAX1697TEUT+T minimizes component count at the expense of efficiency and EMI performance-making the R-version optimal for battery-sensitive, low-EMI applications.
Availability
MAX1697REUT+T is available at Aetrix Electronics and suitable for handheld terminals, battery-operated medical sensors, and small LCD panel designs requiring stable component supply with guaranteed long-term availability.
Supply support for MAX1697REUT+T 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
Maxim Integrated (now part of Analog Devices) is a U.S.-based semiconductor company specializing in high-performance analog and mixed-signal ICs for power management, interface, and sensing applications.
The MAX1697 series was designed specifically for ultra-compact, low-noise negative voltage generation in portable electronics-emphasizing micropower shutdown, EMI reduction, and compatibility with ceramic capacitors.
FAQ
What is the exact oscillator frequency of the MAX1697REUT+T?
The MAX1697REUT+T features a factory-trimmed fixed oscillator frequency of 12kHz, as confirmed by the 'R' suffix in the part number and electrical characteristics tables. This low frequency reduces electromagnetic interference and allows use of cost-effective 1µF ceramic capacitors while maintaining 60mA output capability. The 12kHz operation is fully characterized across -40°C to +85°C and does not require external timing components.
Does the MAX1697REUT+T require external diodes or inductors?
No, the MAX1697REUT+T is a fully integrated capacitive charge pump requiring only two external 1µF ceramic capacitors (C1 and C2) and optionally an input bypass capacitor. It contains all necessary power MOSFET switches, oscillator, and control logic on-die. Unlike inductive DC-DC converters, it eliminates magnetic components, reducing solution size, cost, and EMI concerns-making it ideal for space-constrained portable designs.
How does the shutdown function work on the MAX1697REUT+T?
When the SHDN pin is driven low, the MAX1697REUT+T enters micropower shutdown mode drawing only 2nA supply current, halting internal switching, and actively pulling the OUT pin to ground through a 3Ω internal resistor. Driving SHDN high resumes operation with a controlled start-up sequence that limits inrush current to 170mA typical. This behavior is verified across temperature and ensures safe, predictable state transitions in battery-powered systems.
What is the maximum output current capability of the MAX1697REUT+T?
The MAX1697REUT+T delivers up to 60mA continuous output current into a resistive load, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. This rating assumes proper thermal management (≤+85°C ambient), 1µF low-ESR ceramic capacitors, and input voltage within 1.25V–5.5V. Short-circuit current is 170mA, and thermal shutdown activates at +150°C junction temperature to protect against overload conditions.
Can the MAX1697REUT+T be used to generate voltages other than -1×VIN?
The MAX1697REUT+T is designed exclusively as a -1×VIN inverter and cannot produce doubler (+2×VIN) or fractional outputs without external circuitry. However, multiple MAX1697REUT+T units can be cascaded to achieve -2×VIN or -3×VIN (Figure 4), or combined with diode-capacitor networks for hybrid topologies. Such configurations require careful derating of output current and verification of startup sequencing per the Applications Information section.
MAX1697REUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- 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:
- 60mA
- Frequency - Switching:
- 6kHz ~ 21kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX1697REUT+T FAQ
1.How can I place an order for MAX1697REUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1697REUT+T 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 MAX1697REUT+T reliable?
The price and inventory of MAX1697REUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1697REUT+T is usually 5 days.
3.What payment methods are accepted for MAX1697REUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1697REUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1697REUT+T?
MAX1697REUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1697REUT+T 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 MAX1697REUT+T?
For technical support, including MAX1697REUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1697REUT+T requirements.
6.How does Aetrix verify that MAX1697REUT+T is sourced from the original manufacturer or authorized distributors?
All MAX1697REUT+T 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 MAX1697REUT+T meets industry standards.
7.What is the process for return or replacement of MAX1697REUT+T?
All MAX1697REUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1697REUT+T, 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 MAX1697REUT+T part is unused and in its original packaging.
Return procedure for MAX1697REUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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