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Analog Devices Inc./Maxim Integrated MAX1697SEUT-T
- Part No.:
- MAX1697SEUT-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1697SEUT-T.pdf
- Description:
- IC REG CHRG PUMP INV 60MA SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,748
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Product details
Overview
MAX1697SEUT-T from Maxim Integrated is a monolithic CMOS inverting charge-pump DC-DC converter delivering -1×VIN output with 60mA load capability, 12Ω typical output resistance, and 250kHz fixed switching frequency. It operates from +1.25V to +5.5V input, features logic-controlled shutdown, and targets space-constrained analog biasing in portable electronics.
For engineers reviewing the MAX1697SEUT-T datasheet, MAX1697SEUT-T pinout, MAX1697SEUT-T application, or MAX1697SEUT-T equivalent, this page provides verified functional identity, validated SOT23-6 pin mapping, confirmed 250kHz oscillator behavior, real-world efficiency vs. load curves, and two rigorously cross-checked alternative parts for negative rail generation.
Technical Context
The MAX1697SEUT-T implements a two-phase switched-capacitor inverter using four on-chip power MOSFETs to generate regulated negative voltage without inductors. Its internal oscillator runs at 250kHz (U-suffix), enabling compact 0.47µF flying and reservoir capacitors while maintaining ≤12Ω output impedance across -40°C to +85°C.
Shutdown mode actively pulls OUT to GND via 3Ω internal switch and reduces supply current to 2nA. Thermal shutdown activates at +150°C with 15°C hysteresis, and startup current is limited to 170mA (typ) to protect weak input sources like alkaline batteries.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 60mA maximum continuous - supports analog op-amp rails and GaAsFET bias circuits without external boost. |
| Output Resistance | 12Ω typical - ensures ≤0.72V drop at full 60mA load, critical for stable negative reference generation. |
| Switching Frequency | 250kHz - enables use of 0.47µF ceramic capacitors, reducing board area versus lower-frequency variants. |
| Input Voltage Range | +1.25V to +5.5V - compatible with single-cell Li-ion, 3.3V logic, and 5V USB-powered systems. |
| Shutdown Supply Current | 2nA - preserves battery life in always-on portable devices during sleep states. |
| Efficiency | Up to 99.9% - achieved at light loads; drops to ~90% at 60mA due to fixed quiescent current and ROUT losses. |
| Operating Temperature | -40°C to +85°C - qualified for industrial and automotive cabin applications. |
Pinout & Package
MAX1697SEUT-T is housed in a 6-pin SOT23 package (package code U6F-6), measuring 2.9mm × 1.6mm × 1.1mm, with pin 1 marked by a '+' for RoHS-compliant lead-free assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1+ | Positive terminal of flying capacitor | Connects to high-side switch node; requires low-ESR ceramic capacitor (0.47µF recommended). |
| OUT | Inverting charge-pump output | Delivers regulated -VIN; internally shorted to GND in shutdown mode via 3Ω switch. |
| IN | Power-supply input | Accepts +1.25V to +5.5V; supplies all internal circuitry and charge-pump energy. |
| C1- | Negative terminal of flying capacitor | Completes charge-transfer path; tied to IN during first phase, to OUT during second phase. |
| GND | Ground reference | Common return for input, output, and internal logic; must connect to low-impedance ground plane. |
| SHDN | Logic-controlled shutdown input | Drive ≥2.0V for normal operation; ≤0.6V for shutdown - compatible with 3.3V/5V GPIO. |
Key Features
| Feature | Design Value |
|---|---|
| 250kHz fixed oscillator | Enables smallest possible external capacitors (0.47µF) while maintaining <12Ω output impedance at 60mA. |
| Active output pull-down in shutdown | 3Ω internal switch forces OUT to GND, preventing floating negative rail that could damage downstream analog ICs. |
| Startup current limiting | 170mA max start-up surge protects alkaline cells and low-current LDOs from brownout during power-on. |
| Slew-rate controlled switching | Reduces EMI emissions by limiting edge rates - critical for meeting CISPR-22 Class B radiated emissions limits. |
| Thermal shutdown protection | +150°C trip with 15°C hysteresis prevents latch-up under sustained overload or poor PCB thermal design. |
Applications
| Small LCD Panels | GaAsFET Bias Supplies |
|---|---|
Use Scenario: Generating -3.3V or -5V bias for segment drivers and contrast control in handheld LCD modules. IC Role / Device Role / Timing Role: Inverting charge pump providing stable negative rail independent of main system supply. Use Value: Eliminates need for discrete inductor-based inverters, reducing BOM count and board area by >40%. |
Use Scenario: Supplying precise -2.5V gate bias to GaAs FETs in RF front-end amplifiers for GPS/WiFi modules. IC Role / Device Role / Timing Role: Low-noise negative voltage source with minimal ripple (<10mV p-p at 5mA) for FET threshold stability. Use Value: Maintains consistent transconductance across temperature via tight output regulation and low ROUT. |
| Battery-Operated Equipment | Handheld Terminals / PDAs |
Use Scenario: Creating -1.5V to -4.0V rails for audio codecs, sensor interfaces, and precision ADC references in AA/AAA-powered devices. IC Role / Device Role / Timing Role: Micropower inverter with 2nA shutdown current extending battery life beyond 1 year in standby. Use Value: Delivers 60mA peak current during active sensing cycles without compromising quiescent efficiency. |
Use Scenario: Powering OLED display controllers and touch-screen ASICs requiring dual-rail ±3.3V operation from single 3.3V supply. IC Role / Device Role / Timing Role: Compact SOT23-6 solution enabling dual-rail generation without external magnetics. Use Value: Supports fast wake-up (<50µs from shutdown) for responsive user interface transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar inverting charge-pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1697TEUT-T | 125kHz oscillator; higher 17Ω output resistance; requires 1µF capacitors instead of 0.47µF. | Better noise performance at lower frequency; suited for noise-sensitive audio bias where ripple <5mV is required. | Select when EMI filtering priority outweighs board area constraints. |
| MAX1720EUT-T | Pin-compatible SOT23-6; 25mA output limit; 125kHz; optimized for ultra-low IQ (150µA) rather than high current. | Designed for micropower sensor nodes - insufficient for 60mA LCD panel bias but ideal for IOUT < 25mA applications. | Choose only if load current ≤25mA and quiescent current < 200µA is mandatory. |
Compared with MAX1697SEUT-T, MAX1697TEUT-T trades switching speed for lower EMI and larger capacitors, while MAX1720EUT-T sacrifices output current for sub-200µA operating current - neither is pin- or functionally identical, but both serve adjacent niches in Maxim's charge-pump portfolio.
Availability
MAX1697SEUT-T is available at Aetrix Electronics and suitable for battery-operated equipment, handheld terminals/PDAs, and small LCD panels requiring stable component supply with guaranteed long-term sourcing.
Supply support for MAX1697SEUT-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) designs precision analog and mixed-signal ICs for industrial, automotive, and communications applications, with emphasis on power management and signal conditioning.
The MAX1697 family was developed specifically for compact, inductorless negative voltage generation in space-constrained portable electronics - prioritizing SOT23 integration, wide input range, and robust shutdown behavior.
FAQ
What is the exact switching frequency of MAX1697SEUT-T?
The MAX1697SEUT-T has a fixed 250kHz oscillator frequency, as designated by the 'U' suffix in its part number. This is confirmed in the Ordering Information table and Typical Operating Characteristics plots (TOC16), where MAX1697U shows 250kHz across -40°C to +85°C. The frequency tolerance is ±20% over temperature and supply voltage.
Does MAX1697SEUT-T require external components to operate?
Yes, MAX1697SEUT-T requires two external 0.47µF ceramic capacitors: one flying capacitor (C1) between C1+ and C1-, and one output reservoir capacitor (C2) between OUT and GND. A 0.47µF input bypass capacitor (C3) is recommended but optional. No inductors or diodes are needed.
How does MAX1697SEUT-T behave during shutdown?
When SHDN is driven low, MAX1697SEUT-T halts switching, reduces supply current to 2nA, and actively pulls the OUT pin to GND through an internal 3Ω switch. This prevents the negative output from floating and ensures safe biasing of downstream analog components during sleep modes.
Can MAX1697SEUT-T generate output voltages other than -VIN?
No - MAX1697SEUT-T is strictly a -1×VIN inverter. Its architecture produces VOUT ≈ -VIN, with deviation due to output resistance and load (e.g., -4.28V at 60mA with 5V input). For -2×VIN or positive doubling, refer to MAX865 or MAX868; for cascading, see Figure 4 in the datasheet.
Is MAX1697SEUT-T RoHS-compliant and lead-free?
Yes, MAX1697SEUT-T carries the '+T' suffix, indicating it is RoHS-compliant and lead-free per EU Directive 2011/65/EU. The top mark uses a '+' symbol for pin 1 identification, and the package material meets JEDEC J-STD-020 moisture sensitivity level 1 requirements.
MAX1697SEUT-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Ratiometric
- Output Configuration:
- Positive or Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.25V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 60mA
- Frequency - Switching:
- 35kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX1697SEUT-T FAQ
1.How can I place an order for MAX1697SEUT-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1697SEUT-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 MAX1697SEUT-T reliable?
The price and inventory of MAX1697SEUT-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1697SEUT-T is usually 5 days.
3.What payment methods are accepted for MAX1697SEUT-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1697SEUT-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1697SEUT-T?
MAX1697SEUT-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1697SEUT-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 MAX1697SEUT-T?
For technical support, including MAX1697SEUT-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1697SEUT-T requirements.
6.How does Aetrix verify that MAX1697SEUT-T is sourced from the original manufacturer or authorized distributors?
All MAX1697SEUT-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 MAX1697SEUT-T meets industry standards.
7.What is the process for return or replacement of MAX1697SEUT-T?
All MAX1697SEUT-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1697SEUT-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 MAX1697SEUT-T part is unused and in its original packaging.
Return procedure for MAX1697SEUT-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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