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Analog Devices Inc./Maxim Integrated MAX1697TEUT+T
- Part No.:
- MAX1697TEUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1697TEUT+T.pdf
- Description:
- IC REG CHARGE PUMP INV 60MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:2,866
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Product details
Overview
MAX1697TEUT+T from Maxim Integrated is a monolithic CMOS inverting charge-pump DC-DC converter that generates a regulated negative output voltage (–VIN) from a +1.25V to +5.5V input, delivering up to 60mA with 12Ω typical output resistance and 125kHz oscillator frequency. It features logic-controlled shutdown, thermal protection, and operates in a 6-pin SOT23 package-ideal for space-constrained analog biasing in portable instrumentation and LCD power rails.
For engineers reviewing the MAX1697TEUT+T datasheet, MAX1697TEUT+T pinout, MAX1697TEUT+T application, or MAX1697TEUT+T equivalent, key selection criteria include its fixed 125kHz switching frequency, –1×VIN inversion ratio, 3Ω active-pull-down shutdown resistance, 350µA typical quiescent current, and compatibility with only two 1µF ceramic capacitors in minimal footprint designs.
Technical Context
The MAX1697TEUT+T implements a two-phase switched-capacitor inverter topology using four on-chip MOSFET switches and internal oscillator control. Its 125kHz fixed-frequency operation balances EMI suppression and external capacitor size, while slew-rate limiting reduces high-frequency noise injection into sensitive analog circuitry.
It delivers precise –VIN output under load via dynamic impedance compensation across temperature and input voltage, with thermal shutdown activation at +150°C and automatic recovery after 15°C hysteresis. Shutdown mode pulls OUT to GND through a guaranteed 3–8Ω path while reducing supply current to ≤10nA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 60mA maximum continuous - supports analog op-amp biasing and GaAsFET gate drives without external boost stages. |
| Oscillator Frequency | 125kHz - enables use of compact 2.2µF flying and reservoir capacitors while maintaining low EMI in mixed-signal PCBs. |
| Input Voltage Range | +1.25V to +5.5V - compatible with single-cell Li-ion, 3.3V logic rails, and legacy 5V systems without LDO pre-regulation. |
| Output Resistance | 12Ω typical - ensures ≤720mV voltage drop at full 60mA load, critical for stable negative rail regulation in precision ADC references. |
| Shutdown Supply Current | ≤10nA - extends battery life in handheld PDAs and medical sensors during standby without auxiliary enable circuitry. |
| Quiescent Current | 350µA typical - minimizes no-load power loss in always-on industrial monitoring nodes powered from 3.3V microcontroller rails. |
| Output Polarity | Inverting (–1×VIN) - directly generates clean negative supply for dual-rail op-amps, CCD clocks, and RF front-end bias without inductors. |
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 top plate of flying capacitor C1; forms charge-transfer node during phase-1 switch closure (S1/S3). |
| OUT | Inverted output terminal | Delivers regulated –VIN; actively pulled to GND via 3–8Ω switch during SHDN = low. |
| IN | Positive input supply | Accepts +1.25V to +5.5V; powers internal oscillator and switches; requires local 1µF bypass (C3). |
| C1− | Flying capacitor negative terminal | Connects to bottom plate of C1; referenced to GND during phase-2 (S2/S4 closed) to invert voltage. |
| GND | Analog/digital ground reference | Common return for IN, C1−, and OUT discharge path; must connect to low-impedance ground plane. |
| SHDN | Logic-controlled shutdown input | Active-low enable: <0.6V = shutdown (OUT → GND); >2.1V = normal operation; 10nA bias current allows direct MCU GPIO drive. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low output resistance | 12Ω typical - maintains tight regulation under dynamic 60mA loads common in LCD segment drivers. |
| EMI-optimized switching | Slew-rate limited oscillator - reduces radiated emissions in proximity to RF receivers and audio amplifiers. |
| Startup current limiting | 170mA max - prevents brownout of weak alkaline or coin-cell sources during power-up or wake-from-shutdown. |
| Thermal fault protection | +150°C trip with 15°C hysteresis - autonomously disables switching during sustained overload or poor heatsinking. |
| Minimal external components | Only two 1µF ceramic caps required - eliminates inductors and simplifies layout for ultra-thin wearable PCBs. |
Applications
| Negative Supply for Precision Op-Amps | Small LCD Panel Bias |
|---|---|
Use Scenario: Generating –3.3V from a +3.3V microcontroller rail to power dual-supply instrumentation amplifiers in portable data loggers. IC Role / Device Role / Timing Role: Inverting charge-pump voltage converter providing stable, low-noise negative rail independent of main system supply fluctuations. Use Value: Enables rail-to-rail input/output swing in op-amps without requiring bulky inductor-based converters or discrete transistor inverters. | Use Scenario: Supplying –5V bias to STN/TN LCD segment drivers in handheld test equipment with tight board area constraints. IC Role / Device Role / Timing Role: Compact SOT23 inverter delivering 60mA peak current synchronized to display refresh timing to minimize ripple-induced flicker. Use Value: Achieves <10mVpp output ripple with 2.2µF ceramics-sufficient for 240×160 pixel displays without additional LDO post-regulation. |
| GaAsFET Gate Bias Supply | Handheld Terminal Analog Front-End |
Use Scenario: Providing –2.5V gate bias to GaAsFET LNAs in portable spectrum analyzers operating from single 3.7V Li-ion cells. IC Role / Device Role / Timing Role: Low-ESR charge-pump generating clean negative voltage with fast wake-up (<70µs) to support burst-mode RF measurement sequences. Use Value: 125kHz switching avoids interference in 100MHz–3GHz RF bands while maintaining <1% VOUT drift across –40°C to +85°C. | Use Scenario: Powering ADC reference buffers and sensor signal conditioning circuits in ruggedized field terminals used in utility metering. IC Role / Device Role / Timing Role: Shutdown-capable inverter supplying –2.05V reference rail, enabled only during 10ms ADC conversion windows to conserve battery energy. Use Value: 10nA shutdown current extends 2xAA alkaline battery life to >5 years in low-duty-cycle monitoring applications. |
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; higher 17Ω output resistance; 150µA quiescent current | Better low-EMI performance but larger output capacitors required for same ripple | Select when EMI compliance (e.g., CISPR-22 Class B) is prioritized over board area or light-load efficiency |
| MAX1697UEUT+T | 250kHz oscillator frequency; lower 12Ω output resistance; 300µA quiescent current | Enables smaller 1µF capacitors but increases switching losses above 20mA load | Select for ultra-compact layouts where 125kHz causes excessive ripple or when cascading with other charge pumps |
Compared with MAX1697SEUT+T and MAX1697UEUT+T, the MAX1697TEUT+T offers optimal balance of capacitor size, output impedance, and quiescent power-making it preferred for general-purpose 3.3V/5V inverted rail generation in battery-powered instrumentation where moderate EMI and mid-range load currents dominate design requirements.
Availability
MAX1697TEUT+T is available at Aetrix Electronics and suitable for portable instrumentation, LCD biasing, GaAsFET gate control, and handheld terminal power management requiring stable component supply across extended temperature ranges.
Supply support for MAX1697TEUT+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, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.
The MAX1697 product line was designed specifically for ultra-compact, low-noise inverting DC-DC conversion in space- and power-constrained portable electronics-emphasizing minimal external components, robust thermal behavior, and seamless integration with 3.3V/5V logic domains.
FAQ
What is the exact oscillator frequency of MAX1697TEUT+T?
The MAX1697TEUT+T has a factory-trimmed fixed oscillator frequency of 125kHz, confirmed in the Ordering Information table and Electrical Characteristics section. This frequency is unadjustable and optimized to minimize external capacitor size while maintaining low EMI-distinct from the 12kHz (R), 35kHz (S), and 250kHz (U) variants of the MAX1697 family.
Does MAX1697TEUT+T require external resistors for feedback or configuration?
No, the MAX1697TEUT+T is a fixed-ratio inverting charge pump with no external feedback or configuration pins. Its –1×VIN output is internally regulated by the switched-capacitor topology and does not require resistive dividers, compensation networks, or programming resistors-only two external ceramic capacitors (C1 and C2) and an optional input bypass capacitor (C3) are needed.
Can MAX1697TEUT+T be used to generate voltages other than –VIN?
No-MAX1697TEUT+T is strictly a –1×VIN inverter. It cannot produce fractional, doubled, or adjustable outputs. For non-inverting or multiplied outputs, alternative devices such as the MAX865 (doubler/inverter combo) or MAX1722 (adjustable step-up) must be selected, as the MAX1697TEUT+T's internal switch matrix and control logic are hardwired for single-stage inversion only.
What is the maximum continuous output current specification for MAX1697TEUT+T?
The MAX1697TEUT+T is rated for 60mA continuous output current under all conditions within its operating temperature range (–40°C to +85°C) and input voltage range (+1.25V to +5.5V), as specified in the General Description and Electrical Characteristics tables. Short-circuit current is 170mA, but sustained operation above 60mA risks thermal shutdown activation.
Is MAX1697TEUT+T pin-compatible with other MAX1697 variants like MAX1697SEUT+T?
Yes-MAX1697TEUT+T is fully pin-compatible with all MAX1697 variants (R, S, T, U) in the 6-pin SOT23 package. The suffix denotes only oscillator frequency and RoHS compliance; pin functions, layout, thermal pad connection (none), and PCB footprint are identical across the family, enabling drop-in frequency optimization without redesign.
MAX1697TEUT+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:
- 60kHz ~ 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX1697TEUT+T FAQ
1.How can I place an order for MAX1697TEUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1697TEUT+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 MAX1697TEUT+T reliable?
The price and inventory of MAX1697TEUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1697TEUT+T is usually 5 days.
3.What payment methods are accepted for MAX1697TEUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1697TEUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1697TEUT+T?
MAX1697TEUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1697TEUT+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 MAX1697TEUT+T?
For technical support, including MAX1697TEUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1697TEUT+T requirements.
6.How does Aetrix verify that MAX1697TEUT+T is sourced from the original manufacturer or authorized distributors?
All MAX1697TEUT+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 MAX1697TEUT+T meets industry standards.
7.What is the process for return or replacement of MAX1697TEUT+T?
All MAX1697TEUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1697TEUT+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 MAX1697TEUT+T part is unused and in its original packaging.
Return procedure for MAX1697TEUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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