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Analog Devices Inc./Maxim Integrated MAX1719EUT-T
- Part No.:
- MAX1719EUT-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1719EUT-T.pdf
- Description:
- IC REG CHARGE PUMP INV 25MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:3,384
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Product details
Overview
The MAX1719EUT-T from Maxim Integrated is a monolithic CMOS switched-capacitor voltage inverter with logic-controlled shutdown, designed to generate a regulated negative output (–VIN) from +1.5V to +5.5V input supplies. It operates at 125kHz, delivers up to 25mA continuous output current, achieves 99.9% voltage conversion efficiency, and uses only two 1µF external capacitors. It is commonly deployed to power analog circuitry-such as op-amps or ADCs-from a single positive rail in portable instrumentation.
For engineers reviewing the MAX1719EUT-T datasheet, MAX1719EUT-T pinout, MAX1719EUT-T application, or MAX1719EUT-T equivalent, key selection criteria include its 125kHz oscillator frequency, 1nA shutdown supply current, SOT23-6 package footprint, –1×VIN inversion ratio, and active ground-pull behavior during shutdown-critical for low-noise, battery-sensitive designs.
Technical Context
The MAX1719EUT-T implements a four-switch charge-pump topology with integrated power MOSFETs and oscillator control circuitry. Its inverted shutdown logic (SHDN high = shutdown) actively pulls OUT to GND via a 4Ω internal switch, ensuring safe discharge and system-level rail control.
Output voltage follows VOUT ≈ –(VIN – IOUT × RO), where RO is ~23Ω at +5V input and room temperature. Efficiency is dominated by quiescent current (50µA typical) at light loads and output impedance at heavier loads-enabling predictable droop modeling without regulation circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 125kHz - determines switching period, capacitor sizing, and ripple frequency; enables use of small 1µF ceramic flying/output caps. |
| Input Voltage Range | +1.5V to +5.5V - supports direct connection to Li-ion, NiMH, or logic rails without pre-regulation. |
| Output Current | 25mA continuous - sufficient to power dual op-amps, small ADCs, or bias networks in handheld test gear. |
| Voltage Conversion Efficiency | 99.9% typical - minimizes thermal rise and extends battery life in always-on sensor nodes. |
| Shutdown Supply Current | 1nA - enables multi-year shelf life in battery-backed memory or real-time clock backup circuits. |
| Output Resistance | 23Ω typical at VIN = +5V - defines load-induced droop: e.g., 10mA load causes ~230mV drop from ideal –5V. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems including portable medical devices. |
Pinout & Package
MAX1719EUT-T is housed in a 6-pin SOT23-6 package (JEDEC MO-178AA), with exposed pad not electrically connected. The package measures 2.9mm × 1.6mm × 1.1mm and is compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - C1+ | Positive terminal of flying capacitor | Connects to one side of external 1µF pump capacitor; node swings between VIN and GND during charge/discharge phases. |
| 2 - C1− | Negative terminal of flying capacitor | Connects to other side of flying capacitor; level-shifted to generate negative voltage swing referenced to GND. |
| 3 - IN | Positive input supply | Accepts +1.5V to +5.5V unregulated input; powers internal oscillator and switches; requires local 1µF bypass (C3). |
| 4 - SHDN | Inverting shutdown control input | Logic high (≥VIN − 0.2V) forces shutdown; OUT actively pulled to GND via 4Ω; draws only 1nA in shutdown. |
| 5 - OUT | Inverting charge-pump output | Delivers –VIN (e.g., –5V from +5V); output impedance ~23Ω; voltage droops linearly with load current. |
| 6 - GND | Analog and power ground reference | Common return for IN, OUT, and internal switches; must be low-impedance plane to minimize noise coupling into analog loads. |
Key Features
| Feature | Design Value |
|---|---|
| 1nA shutdown supply current | Enables ultra-low-power sleep modes in battery-operated data loggers without compromising wake-up latency. |
| 99.9% voltage conversion efficiency | Reduces heat generation and input current draw-critical for thermally constrained PCB areas near sensors. |
| Only two 1µF external capacitors required | Eliminates need for large electrolytics or precision regulators; supports compact 3mm × 3mm total solution size. |
| Active GND pull during shutdown | Prevents floating negative rail that could bias downstream analog stages incorrectly upon wake-up. |
| 125kHz fixed-frequency operation | Ensures consistent EMI profile and simplifies filtering; avoids audible noise common in sub-20kHz charge pumps. |
Applications
| Portable Medical Sensors | Industrial Data Acquisition |
|---|---|
|
Use Scenario: Powering rail-to-rail op-amps and low-noise instrumentation amplifiers in handheld ECG or pulse oximeter units. IC Role / Device Role / Timing Role: Generates stable –2.5V or –3.3V bias from a single 3.3V Li-ion cell to enable bipolar signal conditioning. Use Value: Eliminates need for discrete inductor-based converters-reducing BOM count, EMI, and board area while maintaining <10mVp-p ripple at 5mA load. |
Use Scenario: Providing isolated negative supply for 16-bit SAR ADC reference buffers in factory-floor PLC modules. IC Role / Device Role / Timing Role: Inverts +5V system rail to –5V for ADC driver stage, synchronized to system clock via fixed 125kHz switching. Use Value: Achieves 99.9% efficiency and 23Ω output resistance-ensuring <1 LSB error contribution across full –4.95V to –5.0V range at 10mA. |
| Handheld Test Equipment | Low-Power IoT Edge Nodes |
|
Use Scenario: Biasing GaAs FETs in compact RF field strength meters operating from coin-cell batteries. IC Role / Device Role / Timing Role: Delivers –3V GaAs PA bias from +3V coin cell using 125kHz charge pump to avoid inductor saturation issues. Use Value: 1nA shutdown current preserves battery shelf life >5 years; 25mA peak capability supports pulsed transmit bursts. |
Use Scenario: Generating –1.8V supply for ultra-low-power analog front-end (AFE) in environmental sensor nodes. IC Role / Device Role / Timing Role: Inverts +1.8V LDO output to –1.8V for AFE offset trimming, activated only during measurement cycles. Use Value: 50µA quiescent current and 125kHz frequency minimize idle power while enabling fast wake-up (<80µs) from deep sleep. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1721EUT-T | Same 125kHz frequency and 25mA rating, but non-inverted SHDN logic (low = shutdown). | Requires inverted control signal routing; otherwise identical layout and performance. | Select MAX1721EUT-T if system GPIO drives SHDN low for shutdown-eliminates need for external inverter. |
| MAX860ESA+ | Delivers 50mA output, µMAX-8 package, no shutdown; higher quiescent current (100µA) and lower efficiency (99%). | Suitable for higher-current analog rails where shutdown is managed externally or unnecessary. | Choose MAX860ESA+ only when >25mA load current is required and board space allows larger µMAX footprint. |
Compared with MAX1719EUT-T, MAX1721EUT-T offers identical electrical performance but reversed shutdown polarity-simplifying control logic integration where low-active signals dominate. MAX860ESA+ trades shutdown capability and package size for doubled output current, making it appropriate only for non-battery-critical, higher-power analog subsystems.
Availability
MAX1719EUT-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition systems, handheld test equipment, and low-power IoT edge nodes requiring stable component supply across extended product lifecycles.
Supply support for MAX1719EUT-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 semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.
The MAX1719/MAX1720/MAX1721 family was designed specifically for ultra-small, high-efficiency voltage inversion in space-constrained, battery-powered applications-emphasizing minimal external components, nanoscale shutdown current, and robust SOT23 integration.
FAQ
What is the shutdown behavior of the MAX1719EUT-T?
The MAX1719EUT-T features inverted shutdown logic: driving SHDN high places the device in shutdown mode, halting switching, reducing supply current to 1nA, and actively pulling the OUT pin to GND through a 4Ω internal switch. This ensures safe discharge of the output capacitor and prevents floating negative rails during system sleep-critical for reliable wake-up in portable instrumentation using the MAX1719EUT-T.
Can the MAX1719EUT-T generate regulated output voltages?
No, the MAX1719EUT-T is an unregulated charge-pump inverter. Its output voltage follows VOUT ≈ –(VIN – IOUT × RO), where RO is ~23Ω at +5V input. Output droop is linear with load current-for example, a 15mA load on a +5V input yields ~–4.65V. For regulated outputs (e.g., stable –5.0V), designers must add external feedback or select alternatives like the MAX868, which integrates regulation. The MAX1719EUT-T itself provides no voltage regulation.
What capacitor types and values are recommended for the MAX1719EUT-T?
The MAX1719EUT-T requires two 1µF ceramic capacitors: C1 (flying capacitor) between C1+ and C1−, and C2 (output reservoir) between OUT and GND. Low-ESR X7R or NP0 ceramics are mandatory-tantalum or aluminum electrolytics introduce excessive loss and instability. A third 1µF bypass capacitor (C3) is recommended between IN and GND. These values enable 25mA output with <10mVp-p ripple at 125kHz, as verified in the MAX1719EUT-T datasheet's Typical Operating Characteristics.
How does temperature affect the MAX1719EUT-T's output resistance?
Output resistance (RO) of the MAX1719EUT-T increases with temperature: from ~20Ω at –40°C to ~30Ω at +85°C (measured at VIN = +5V). This variation directly impacts output voltage droop-e.g., a 20mA load produces ~400mV drop at –40°C versus ~600mV at +85°C. Designers must verify worst-case VOUT across the full –40°C to +85°C range using the RO vs. temperature curve in the MAX1719EUT-T datasheet Figure MAX1720/21toc07.
Is the MAX1719EUT-T pin-compatible with other devices in its family?
Yes, the MAX1719EUT-T shares identical SOT23-6 pinout and footprint with MAX1720EUT-T and MAX1721EUT-T. All three devices use the same C1+, C1−, IN, SHDN, OUT, GND arrangement. However, shutdown polarity differs: MAX1719EUT-T shuts down on SHDN high, while MAX1720/MAX1721 shut down on SHDN low. Swapping them requires adjusting control logic-but no PCB changes are needed for mechanical or electrical layout compatibility.
MAX1719EUT-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:
- 25mA
- 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
MAX1719EUT-T FAQ
1.How can I place an order for MAX1719EUT-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1719EUT-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 MAX1719EUT-T reliable?
The price and inventory of MAX1719EUT-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1719EUT-T is usually 5 days.
3.What payment methods are accepted for MAX1719EUT-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1719EUT-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1719EUT-T?
MAX1719EUT-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1719EUT-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 MAX1719EUT-T?
For technical support, including MAX1719EUT-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1719EUT-T requirements.
6.How does Aetrix verify that MAX1719EUT-T is sourced from the original manufacturer or authorized distributors?
All MAX1719EUT-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 MAX1719EUT-T meets industry standards.
7.What is the process for return or replacement of MAX1719EUT-T?
All MAX1719EUT-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1719EUT-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 MAX1719EUT-T part is unused and in its original packaging.
Return procedure for MAX1719EUT-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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