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Analog Devices Inc./Maxim Integrated MAX1697UEUT#TG16
- Part No.:
- MAX1697UEUT#TG16
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1697UEUT#TG16.pdf
- Description:
- IC REG CHARGE PUMP INV 60MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:4,948
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Product details
Overview
MAX1697UEUT#TG16 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 MAX1697UEUT#TG16 datasheet, MAX1697UEUT#TG16 pinout, MAX1697UEUT#TG16 application, or MAX1697UEUT#TG16 equivalent, key selection criteria include its SOT23-6 package footprint, 250kHz oscillator frequency (U-suffix), ultra-low 2nA shutdown current, 12Ω output impedance at 25°C, and compatibility with only two 1µF ceramic capacitors for full operation.
Technical Context
The MAX1697UEUT#TG16 implements a two-phase switched-capacitor inverter using four on-chip power MOSFETs to generate regulated negative voltage. Its internal oscillator runs at 250kHz (U-suffix), enabling smaller external capacitors versus lower-frequency variants (e.g., 12kHz R-suffix).
It integrates thermal shutdown (trip at +150°C, 15°C hysteresis) and startup current limiting (170mA typ), with active ground pull-down (3Ω) on OUT during shutdown. Output regulation relies on capacitor ESR and internal switch resistance, not feedback control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 60mA maximum continuous - supports moderate analog circuitry like op-amp rails or GaAsFET bias without external boost stages. |
| Output Resistance | 12Ω typical at +25°C - determines voltage droop under load; lower than MAX1697T (17Ω) due to higher 250kHz switching frequency. |
| Oscillator Frequency | 250kHz fixed - enables use of smaller 1µF flying/output capacitors versus 12kHz/35kHz variants, reducing board area. |
| Input Voltage Range | +1.25V to +5.5V - compatible with single-cell Li-ion (3.0–4.2V), alkaline (1.5V), and logic supplies (+3.3V/+5V). |
| Shutdown Supply Current | 2nA typical - preserves battery life in always-on systems requiring periodic wake-up from deep sleep. |
| Efficiency | Up to 99% at light loads - dominated by quiescent current (150µA typ); drops at higher loads due to I²R losses in 12Ω output path. |
| Operating Temperature | -40°C to +85°C - qualified for industrial and automotive cabin applications where ambient temperature exceeds consumer grade. |
Pinout & Package
MAX1697UEUT#TG16 is housed in a RoHS-compliant, lead-free 6-pin SOT23 package (package code U6F-6), with pin 1 marked by a '+' indicator per Maxim guideline. The compact 2.9mm × 1.6mm footprint supports high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1+ | Flying capacitor positive terminal | Connects to one side of external 1µF pump capacitor; switches between IN and OUT nodes during charge-transfer phases. |
| OUT | Inverted output node | Delivers regulated -VIN voltage; actively pulled to GND via 3Ω switch during shutdown. |
| IN | Positive input supply | Accepts +1.25V to +5.5V; powers internal oscillator and MOSFET drivers; requires local 1µF bypass (C3). |
| C1- | Flying capacitor negative terminal | Connects to other side of 1µF pump capacitor; alternately referenced to GND and OUT to enable voltage inversion. |
| GND | Analog/digital ground reference | Common return for IN, C1-, and internal circuitry; must be low-impedance plane to minimize noise coupling. |
| SHDN | Logic-controlled enable/disable input | High (>2.1V) enables operation; low (<0.6V) halts switching and pulls OUT to GND; draws ≤10nA in shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| 250kHz fixed-frequency operation | Enables use of 1µF ceramic capacitors instead of larger tantalum units, cutting solution size by >50% vs. 12kHz variant. |
| 12Ω typical output resistance | Minimizes voltage drop at 60mA load (ΔV = 720mV), supporting stable -4.3V output from +5V input under full load. |
| 2nA shutdown current | Extends shelf life and runtime in battery-powered devices-e.g., adds ~1.2 years to 200mAh coin cell life when idle. |
| Slew-rate limited switching | Reduces EMI generation during capacitor charge/discharge transitions, easing EMC compliance in sensitive RF environments. |
| Thermal shutdown protection | Halts operation at +150°C die temperature and resumes automatically after 15°C cooldown, preventing latch-up or damage. |
Applications
| Negative Supply from +3.3V Logic | Small LCD Panel Bias |
|---|---|
Use Scenario: Generating -3.3V rail from existing +3.3V microcontroller supply to power op-amps or ADC reference buffers. IC Role / Device Role / Timing Role: Inverting charge-pump voltage converter providing isolated negative bias without inductors or transformers. Use Value: Eliminates need for discrete inductor-based inverters; achieves ±0.5% output stability over temperature with 1µF ceramics. |
Use Scenario: Supplying VGL (gate low) voltage for TFT-LCD column drivers in handheld medical displays. IC Role / Device Role / Timing Role: Compact, low-noise negative voltage source synchronized to display frame rate via SHDN toggling. Use Value: Delivers clean -5V at 20mA with <15mV ripple (250kHz switching), meeting LCD driver noise immunity specs. |
| GaAsFET Bias Supply | Battery-Operated Portable Instrumentation |
Use Scenario: Providing precise -2.5V gate bias for GaAs FET RF front-end amplifiers in spectrum analyzers. IC Role / Device Role / Timing Role: Low-ESR, low-ripple inverter minimizing phase noise contribution to RF signal chain. Use Value: 12Ω output resistance ensures <10mV droop at 25mA load, preserving amplifier linearity and gain flatness. |
Use Scenario: Powering analog sensor signal conditioning (e.g., strain gauge bridges) in handheld multimeters. IC Role / Device Role / Timing Role: Micropower inverter enabling dual-rail operation from single alkaline cell (1.5V min). Use Value: Operates down to +1.25V input and draws only 150µA quiescent current, extending 2xAA battery life to >12 months. |
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#TG16 | 125kHz oscillator frequency; 17Ω typical output resistance; higher output ripple at same capacitor values. | Better suited for noise-sensitive audio biasing where lower switching frequency reduces EMI above 100kHz band. | Select when lower EMI priority outweighs board space constraints; requires larger capacitors for equivalent output impedance. |
| MAX1720EUT#TG16 | Pin-compatible SOT23-6; 25mA max output; 250kHz frequency; optimized for ultra-low quiescent current (100µA typ). | Targeted at micropower sensor nodes where 60mA capability is unnecessary and standby current is critical. | Choose for sub-20mA loads where 2nA shutdown and minimal BOM cost are primary drivers over output current headroom. |
Compared with MAX1697TEUT#TG16, the MAX1697UEUT#TG16 delivers 24% lower output resistance and 2× higher output current, enabling tighter voltage regulation under dynamic loads; versus MAX1720EUT#TG16, it trades 2.4× higher output current for 50% higher quiescent supply current, favoring performance over micropower in mid-range portable designs.
Availability
MAX1697UEUT#TG16 is available at Aetrix Electronics and suitable for battery-operated equipment, small LCD panels, and GaAsFET bias supplies requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX1697UEUT#TG16 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 semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.
The MAX1697 series was designed specifically for compact, inductorless negative voltage generation in space-constrained portable and instrumentation systems, emphasizing low ESR, low noise, and wide input voltage tolerance.
FAQ
What is the exact switching frequency of MAX1697UEUT#TG16?
The MAX1697UEUT#TG16 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 Electrical Characteristics section, where MAX1697U shows 250kHz typical frequency across -40°C to +85°C. It does not support frequency adjustment via external components.
Can MAX1697UEUT#TG16 operate from a 1.5V alkaline battery?
Yes, MAX1697UEUT#TG16 supports input voltages as low as +1.25V, making it fully compatible with single 1.5V alkaline cells across their discharge curve. Startup current is limited to 170mA typ to prevent brownout, and efficiency remains >85% at 1.5V input with 10mA load per Typical Operating Characteristics graphs.
What capacitors are required for basic operation of MAX1697UEUT#TG16?
MAX1697UEUT#TG16 requires only two 1µF ceramic capacitors: one flying capacitor (C1) between C1+ and C1-, and one output reservoir capacitor (C2) between OUT and GND. A third 1µF bypass capacitor (C3) on IN is recommended. All must be X7R or better with ESR ≤0.3Ω per datasheet Note 7.
Does MAX1697UEUT#TG16 provide regulated output voltage?
No, MAX1697UEUT#TG16 is an unregulated inverting charge pump: its output is approximately -1×VIN, with deviation determined by output resistance (12Ω), load current, and capacitor ESR. For example, at 60mA load and +5V input, output is typically -4.28V. Regulation requires external feedback or post-regulation.
How does shutdown functionality work on MAX1697UEUT#TG16?
Driving SHDN low disables switching, reduces supply current to 2nA typical, and actively pulls OUT to GND through a 3Ω internal switch. Driving SHDN high (>2.1V) restarts operation; wake-up time to 90% of final output is ~50μs (per TOC20). No external pull-up is required-the pin is CMOS-compatible with TTL/CMOS logic.
MAX1697UEUT#TG16 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):
- 1.6V
- 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#TG16 FAQ
1.How can I place an order for MAX1697UEUT#TG16 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1697UEUT#TG16 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#TG16 reliable?
The price and inventory of MAX1697UEUT#TG16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1697UEUT#TG16 is usually 5 days.
3.What payment methods are accepted for MAX1697UEUT#TG16?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1697UEUT#TG16 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1697UEUT#TG16?
MAX1697UEUT#TG16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1697UEUT#TG16 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#TG16?
For technical support, including MAX1697UEUT#TG16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1697UEUT#TG16 requirements.
6.How does Aetrix verify that MAX1697UEUT#TG16 is sourced from the original manufacturer or authorized distributors?
All MAX1697UEUT#TG16 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#TG16 meets industry standards.
7.What is the process for return or replacement of MAX1697UEUT#TG16?
All MAX1697UEUT#TG16 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1697UEUT#TG16, 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#TG16 part is unused and in its original packaging.
Return procedure for MAX1697UEUT#TG16:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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