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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 CHARGE PUMP INV 60MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:1,758
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Product details
Overview
The MAX1697SEUT+T from Maxim Integrated is a monolithic CMOS inverting charge-pump DC-DC converter delivering -1×VIN output with 60mA load capability, 125kHz fixed switching frequency, and ultra-low 12Ω output resistance. It operates from +1.25V to +5.5V input, features logic-controlled shutdown, and targets analog supply generation in space-constrained portable systems.
For engineers reviewing the MAX1697SEUT+T datasheet, MAX1697SEUT+T pinout, MAX1697SEUT+T application, or MAX1697SEUT+T equivalent, key selection criteria include its SOT23-6 package footprint, 125kHz oscillator frequency, 12Ω output impedance at 60mA, shutdown current of ≤2nA, and compatibility with only two 1µF ceramic capacitors for minimal BOM count.
Technical Context
The MAX1697SEUT+T implements a four-switch flying-capacitor topology with integrated power MOSFETs to invert input voltage without inductors. Its internal oscillator runs at a fixed 125kHz, balancing efficiency and external capacitor size while minimizing EMI through slew-rate limiting.
It includes thermal shutdown (trip at +150°C, 15°C hysteresis), start-up current limiting (170mA typ), and active pull-down of OUT to GND via 3Ω during shutdown. The device uses low-ESR ceramic capacitors and requires no external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 60mA continuous - supports moderate analog loads such as op-amp rails or LCD bias without derating. |
| Output Resistance | 12Ω - ensures <100mV drop at 60mA load, critical for stable negative rail regulation. |
| Switching Frequency | 125kHz - enables use of compact 1µF ceramic flying/output capacitors while maintaining low ripple. |
| Input Voltage Range | +1.25V to +5.5V - compatible with single-cell Li-ion, alkaline, and logic-supply rails (3.3V/5V). |
| Shutdown Current | ≤2nA - preserves battery life in always-on portable devices during deep sleep modes. |
| Efficiency | Up to 99% at light loads - minimizes quiescent loss when driving low-current analog circuitry. |
| Operating Temp | -40°C to +85°C - qualified for industrial and automotive cabin applications. |
Pinout & Package
Package: 6-pin SOT23 (U6F-6), 1.6mm × 2.9mm footprint, RoHS-compliant lead-free construction with '+' pin-1 marker.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1+ | Flying capacitor positive terminal | Connects to high-side plate of flying capacitor C1; switches between IN and OUT nodes during charge/discharge phases. |
| OUT | Inverted output terminal | Delivers regulated -VIN voltage; actively pulled to GND via 3Ω during shutdown. |
| IN | Positive input supply | Accepts +1.25V to +5.5V; supplies energy to charge pump; must be bypassed with ≥1µF capacitor. |
| C1- | Flying capacitor negative terminal | Connects to low-side plate of flying capacitor C1; referenced to GND during charging phase. |
| GND | Power ground reference | Return path for all internal switches and external capacitors; requires low-impedance PCB plane connection. |
| SHDN | Logic-controlled enable | High = normal operation; low = shutdown mode with 2nA supply current and OUT forced to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low output resistance | 12Ω enables 60mA output with <720mV dropout, supporting precision analog rails. |
| Fixed 125kHz oscillator | Optimizes capacitor size vs. efficiency trade-off; eliminates external timing components. |
| Two-capacitor operation | Requires only two 1µF ceramic capacitors (C1, C2) - reduces BOM cost and board area. |
| Slew-rate limited switching | Reduces conducted EMI, easing EMC compliance in noise-sensitive portable designs. |
| Thermal shutdown protection | Auto-recovery at +135°C prevents latch-up or damage during overload or poor heatsinking. |
Applications
| Negative Supply Generation | Small LCD Bias |
|---|---|
Use Scenario: Generating -3.3V from a +3.3V microcontroller supply to power op-amps or ADC reference buffers in handheld medical sensors. IC Role / Device Role / Timing Role: Inverting charge-pump voltage converter providing isolated negative rail without inductors. Use Value: Eliminates need for bulky inductors and dual-output regulators, reducing solution size by >40% versus inductive alternatives. | Use Scenario: Supplying -10V bias to segment drivers in monochrome STN LCD modules used in industrial HMIs. IC Role / Device Role / Timing Role: High-efficiency inverter delivering stable negative voltage under pulsed load conditions. Use Value: Maintains <5% output deviation across 0–60mA load range, ensuring consistent contrast and grayscale fidelity. |
| GaAsFET Bias Supply | Handheld Terminal Power |
Use Scenario: Providing -5V gate bias for GaAsFET RF amplifiers in portable spectrum analyzers operating from single 3.7V Li-ion cells. IC Role / Device Role / Timing Role: Low-noise inverting regulator with EMI-slew control to avoid interference with sensitive RF front-ends. Use Value: Output ripple <15mVpp at 5mA load enables clean biasing without degrading amplifier NF or gain flatness. | Use Scenario: Creating -5V rail from +5V USB power in ruggedized handheld terminals for barcode scanning and wireless comms. IC Role / Device Role / Timing Role: Robust inverter with thermal shutdown and start-up current limiting for unregulated input sources. Use Value: Survives repeated hot-plug events and brownouts; maintains functionality during battery swap without system reset. |
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 | 12kHz oscillator frequency; higher output impedance (17Ω); lower quiescent current (150µA) | Better suited for ultra-low-power, low-noise applications where capacitor size is secondary to supply current | Select when prioritizing micropower operation over output current capability or ripple performance |
| MAX1697UEUT+T | 250kHz oscillator frequency; lowest output impedance (8Ω); higher quiescent current (300µA) | Optimized for high-current, low-ripple applications requiring minimal capacitor ESR sensitivity | Select when driving dynamic loads up to 60mA with tight voltage regulation and fast transient response |
Compared with MAX1697SEUT+T, the MAX1697TEUT+T trades switching speed for lower IQ and higher output impedance, while the MAX1697UEUT+T delivers lower ROUT and faster regulation at the cost of higher supply current - enabling precise selection based on load profile and power budget.
Availability
MAX1697SEUT+T is available at Aetrix Electronics and suitable for battery-operated equipment, small LCD panels, GaAsFET bias supplies, and handheld terminals requiring stable component supply and long-term production continuity.
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, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX1697 family delivers ultra-small, high-efficiency inverting charge pumps targeting space-constrained portable electronics needing clean, inductorless negative rails.
FAQ
What is the exact switching frequency of the MAX1697SEUT+T?
The MAX1697SEUT+T has a fixed internal oscillator frequency of 125kHz, as confirmed by the 'T' suffix in its ordering code and verified in the Electrical Characteristics table. This frequency is factory-trimmed and not adjustable externally. It enables optimal balance between capacitor size (allowing use of 1µF ceramics) and conversion efficiency across the full input voltage range of +1.25V to +5.5V. The MAX1697SEUT+T does not require external timing components.
Does the MAX1697SEUT+T require external diodes or inductors?
No, the MAX1697SEUT+T is a fully integrated inverting charge pump that requires no external diodes or inductors. Its four internal MOSFET switches implement the flying-capacitor inversion topology. Only two external ceramic capacitors (C1 and C2, typically 1µF each) and an optional input bypass capacitor (C3) are needed. This eliminates magnetic components, reduces EMI, and simplifies layout - a key advantage of the MAX1697SEUT+T over inductive DC-DC solutions.
How does the shutdown function work on the MAX1697SEUT+T?
When the SHDN pin of the MAX1697SEUT+T is driven low, the device enters ultra-low-power shutdown mode: switching halts, supply current drops to ≤2nA, and the OUT pin is actively pulled to GND through a 3Ω internal resistor. Driving SHDN high resumes operation, with startup time dependent on oscillator frequency and capacitor values. This behavior is specified across -40°C to +85°C and ensures reliable rail collapse and recovery in battery-powered systems using the MAX1697SEUT+T.
What is the maximum output current capability of the MAX1697SEUT+T?
The MAX1697SEUT+T delivers up to 60mA continuous output current into a resistive load while maintaining regulation within datasheet limits. Short-circuit current is rated at 170mA (typical), and the device includes start-up current limiting to protect weak input sources. Output voltage droop remains below 720mV at 60mA due to its 12Ω typical output resistance. Performance is guaranteed over the full -40°C to +85°C temperature range, making the MAX1697SEUT+T suitable for industrial-grade portable applications.
Which capacitors are recommended for use with the MAX1697SEUT+T?
The MAX1697SEUT+T is optimized for two 1µF X7R ceramic capacitors: C1 (flying capacitor) and C2 (output reservoir). Low-ESR (<0.3Ω) ceramics from AVX (TPS series), Matsuo (267 series), or Sprague (593D/595D) are explicitly recommended in the datasheet. These minimize output resistance and ripple. An optional 1µF input bypass capacitor (C3) is advised to suppress switching noise on the IN rail. Tantalum or aluminum electrolytics are not recommended due to higher ESR and reliability concerns in the MAX1697SEUT+T application.
MAX1697SEUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- 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:
- 60mA
- Frequency - Switching:
- 16kHz ~ 60kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-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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