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Analog Devices Inc./Maxim Integrated MAX1697UEUT+T
- Part No.:
- MAX1697UEUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1697UEUT+T.pdf
- Description:
- IC REG CHARGE PUMP INV 60MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:6,183
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Product details
Overview
The MAX1697UEUT+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 MAX1697UEUT+T datasheet, MAX1697UEUT+T pinout, MAX1697UEUT+T application, or MAX1697UEUT+T equivalent, key selection criteria include its 250kHz fixed switching frequency, ultra-low 2nA shutdown current, slew-rate-limited operation for EMI reduction, and compatibility with only two 1µF ceramic capacitors in the typical operating circuit.
Technical Context
The MAX1697UEUT+T implements a four-switch flying-capacitor topology with integrated power MOSFETs and oscillator control. Its 250kHz fixed-frequency operation minimizes external capacitor size while maintaining low output impedance (12Ω typ) and high efficiency (>95% at 20mA with VIN=5V).
It features active shutdown with 3Ω pull-down resistance on OUT, thermal shutdown at +150°C with 15°C hysteresis, and start-up current limiting to 170mA (typ) to protect weak input sources such as alkaline batteries.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 60mA maximum continuous load capability at specified efficiency and regulation |
| Output Resistance | 12Ω typical - determines voltage droop under load and ripple performance |
| Switching Frequency | 250kHz fixed - enables use of small 1µF ceramic flying/output capacitors |
| Input Voltage Range | +1.25V to +5.5V - supports single-cell Li-ion, NiMH, and standard logic rail inputs |
| Shutdown Supply Current | 2nA typical - preserves battery life during system sleep modes |
| Efficiency | Up to 99.9% at light loads; >95% at 20mA with VIN=5V - reduces thermal load and extends runtime |
| Oscillator Accuracy | ±20% over temperature - sufficient for capacitor sizing without tight tolerance components |
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 one side of external pump capacitor C1; carries full switching current |
| OUT | Inverting charge-pump output | Delivers regulated negative output voltage; actively pulled to GND in shutdown |
| IN | Power-supply input | Accepts 1.25V–5.5V input; supplies internal oscillator and switches |
| C1- | Negative terminal of flying capacitor | Completes flying capacitor path; referenced to IN during charge phase |
| GND | Analog/digital ground | Common reference for all signals; requires low-impedance PCB ground plane |
| SHDN | Logic-controlled shutdown input | High = normal operation; low = 2nA shutdown with OUT pulled to GND via 3Ω |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low output resistance | 12Ω typical enables stable 60mA output with minimal voltage drop across load |
| Slew-rate limited switching | Reduces EMI emissions without requiring additional filtering components |
| Minimal external components | Only two 1µF ceramic capacitors required - simplifies BOM and layout |
| Thermal shutdown protection | +150°C trip with 15°C hysteresis prevents damage during overload or poor heatsinking |
| Start-up current limiting | 170mA max limits inrush into weak sources like alkaline cells or high-ESR supplies |
Applications
| Small LCD Panels | GaAsFET Bias Supplies |
|---|---|
Use Scenario: Powering segment drivers and contrast control circuits in handheld LCD modules. IC Role / Device Role / Timing Role: Generates clean -3.3V or -5V bias from main +3.3V system rail. Use Value: Enables compact, low-cost display power architecture with no inductors or transformers. | Use Scenario: Providing negative gate bias for GaAs FET amplifiers in RF front-ends. IC Role / Device Role / Timing Role: Delivers stable, low-noise -5V bias with fast transient response to maintain amplifier linearity. Use Value: Eliminates need for discrete charge-pump ICs or transformer-based solutions in miniaturized RF modules. |
| Battery-Operated Equipment | Handheld Terminals & PDAs |
Use Scenario: Generating analog supply rails in portable medical sensors and data loggers. IC Role / Device Role / Timing Role: Inverts single-cell Li-ion (3.0–4.2V) to -3.0V for op-amp and ADC reference stages. Use Value: Extends battery life via 2nA shutdown current and maintains accuracy with <12Ω output impedance. | Use Scenario: Supporting RS-232 level-shifting and touchscreen controller analog supplies. IC Role / Device Role / Timing Role: Provides isolated -5V from +3.3V microcontroller rail for interface ICs. Use Value: Reduces board area by replacing discrete diode-capacitor pumps with a fully integrated solution. |
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 switching frequency; higher output impedance (17Ω typ) | Lower EMI but larger external capacitors required for same output impedance | Select when lower switching noise is prioritized over component size |
| MAX1720EUT+T | Pin-compatible SOT23; 25mA output limit; 250kHz frequency | Reduced load capability; suitable only for sub-25mA bias applications | Choose for lower-power analog sections where 60mA headroom is unnecessary |
Compared with MAX1697TEUT+T, the MAX1697UEUT+T offers lower output impedance and smaller capacitors due to its higher 250kHz frequency; compared with MAX1720EUT+T, it provides 2.4× higher output current while sharing identical pinout and package, enabling direct upgrade in existing layouts.
Availability
MAX1697UEUT+T is available at Aetrix Electronics and suitable for battery-powered equipment, small LCD panels, GaAsFET bias supplies, and handheld terminals requiring stable component supply with guaranteed long-term availability.
Supply support for MAX1697UEUT+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, communications, and consumer applications.
The MAX1697 series targets ultra-compact, low-quiescent-current inverting charge pumps for portable and space-constrained systems where inductorless negative voltage generation is critical.
FAQ
What is the switching frequency of the MAX1697UEUT+T?
The MAX1697UEUT+T operates at a fixed 250kHz switching frequency, as indicated by the 'U' suffix in its part number. This high frequency allows use of small 1µF ceramic capacitors for both flying and output stages, minimizing board area and cost. The frequency is factory-trimmed and not user-adjustable.
Does the MAX1697UEUT+T require external diodes or inductors?
No, the MAX1697UEUT+T is a fully integrated inverting charge pump that requires only two external 1µF ceramic capacitors (C1 and C2) and optionally an input bypass capacitor (C3). It contains all necessary power MOSFET switches, oscillator, and control circuitry on-die - no external diodes, inductors, or transformers are needed.
How does the shutdown function work on the MAX1697UEUT+T?
When the SHDN pin is driven low, the MAX1697UEUT+T enters shutdown mode with 2nA supply current and actively pulls the OUT pin to GND through a 3Ω internal resistor. Driving SHDN high restarts the device; wake-up time from shutdown is typically 600µs for the MAX1697U variant, as confirmed in the Electrical Characteristics table.
What is the maximum output current capability of the MAX1697UEUT+T?
The MAX1697UEUT+T delivers up to 60mA continuous output current while maintaining regulation and efficiency specifications. Absolute Maximum Ratings specify 90mA short-circuit current, but sustained operation above 60mA may cause excessive voltage droop or thermal stress depending on ambient conditions and PCB layout.
Can the MAX1697UEUT+T be used with input voltages below 1.5V?
Yes, the MAX1697UEUT+T supports an input voltage range of +1.25V to +5.5V, making it compatible with single-cell alkaline (1.5V), NiMH (1.2V), and Li-ion (3.0–4.2V) sources. At 1.25V input, it generates approximately -1.25V output, though output current capability decreases proportionally with input voltage per the Output Voltage vs. Output Current curves.
MAX1697UEUT+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):
- 1.6V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 60mA
- Frequency - Switching:
- 120kHz ~ 400kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX1697UEUT+T FAQ
1.How can I place an order for MAX1697UEUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1697UEUT+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 MAX1697UEUT+T reliable?
The price and inventory of MAX1697UEUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1697UEUT+T is usually 5 days.
3.What payment methods are accepted for MAX1697UEUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1697UEUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1697UEUT+T?
MAX1697UEUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1697UEUT+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 MAX1697UEUT+T?
For technical support, including MAX1697UEUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1697UEUT+T requirements.
6.How does Aetrix verify that MAX1697UEUT+T is sourced from the original manufacturer or authorized distributors?
All MAX1697UEUT+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 MAX1697UEUT+T meets industry standards.
7.What is the process for return or replacement of MAX1697UEUT+T?
All MAX1697UEUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1697UEUT+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 MAX1697UEUT+T part is unused and in its original packaging.
Return procedure for MAX1697UEUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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