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Analog Devices Inc./Maxim Integrated MAX1719EUT+
- Part No.:
- MAX1719EUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1719EUT+.pdf
- Description:
- IC REG CHARGE PUMP INV 25MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:3,331
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Product details
Overview
The MAX1719EUT+ from Maxim Integrated is a monolithic CMOS switched-capacitor voltage inverter with logic-controlled shutdown, designed to generate a regulated negative output (–VIN) from a +1.5V to +5.5V input supply. It operates at 125kHz, delivers up to 25mA continuous output current, achieves 99.9% voltage conversion efficiency, and uses only two 1µF external ceramic capacitors - ideal for space-constrained analog biasing in portable instrumentation.
For engineers reviewing the MAX1719EUT+ datasheet, MAX1719EUT+ pinout, MAX1719EUT+ application, or MAX1719EUT+ equivalent, key selection criteria include its inverted shutdown polarity (SHDN high = shutdown), 6-pin SOT23-6 package, 1nA shutdown supply current, and output resistance of 23Ω at +5V input - critical for low-noise analog rail generation.
Technical Context
The MAX1719EUT+ implements a four-switch charge-pump topology with integrated power MOSFETs and oscillator control circuitry. Its inverting shutdown input (SHDN high = shutdown) differs from the MAX1720/MAX1721 variants, and it maintains stable –VIN output under light loads while exhibiting predictable droop (VDROOP– = IOUT × RO) as load increases.
It relies on external flying (C1) and reservoir (C2) capacitors to achieve inversion; output voltage accuracy and ripple are directly governed by capacitor ESR and values. The device is not regulated - VOUT ≈ –VIN only when IOUT is low - and requires low-ESR ceramic capacitors to minimize output impedance and noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +1.5V to +5.5V - supports single-cell Li-ion, alkaline, and 3.3V/5V logic rails without external regulation. |
| Oscillator Frequency | 125kHz - enables use of small 1µF ceramic capacitors and reduces EMI compared to lower-frequency inverters. |
| Output Current | 25mA continuous - sufficient to power op-amp dual supplies, LCD bias, or GaAs PA stages in handheld devices. |
| Voltage Conversion Efficiency | 99.9% - minimizes power loss and thermal rise in battery-powered systems during light-load operation. |
| Shutdown Supply Current | 1nA - extends battery life in sleep modes; OUT actively pulled to GND via 4Ω internal switch during shutdown. |
| Output Resistance | 23Ω at TA = +25°C, VIN = +5V - defines output voltage droop (e.g., –4.425V at 25mA load from +5V input). |
| Quiescent Current | 50µA - sets baseline power draw when active but unloaded; critical for always-on analog subsystems. |
Pinout & Package
MAX1719EUT+ is housed in a 6-pin SOT23-6 package with exposed pad (not thermally enhanced). Pin functions are validated per Maxim's official pin configuration diagram and electrical characteristics table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - C1+ | Positive terminal of flying capacitor | Connects to top plate of C1 during charging phase; must be routed with low-inductance trace to minimize switching noise. |
| 2 - C1− | Negative terminal of flying capacitor | Connects to bottom plate of C1; forms charge-transfer path between IN and OUT; sensitive to PCB parasitics. |
| 3 - IN | Positive input supply | Accepts +1.5V to +5.5V; requires local 1µF bypass capacitor (C3) to suppress switching transients on source rail. |
| 4 - SHDN | Inverting shutdown control input | Drive HIGH to enter 1nA shutdown mode; OUT forced to GND via 4Ω switch - no external pull-up needed. |
| 5 - OUT | Inverting charge-pump output | Delivers –VIN (e.g., –5V from +5V); output impedance dominates voltage accuracy under load; connect C2 directly. |
| 6 - GND | Analog and power ground reference | Single-point connection required; tie to system ground plane beneath IC; avoid sharing with noisy digital return paths. |
Key Features
| Feature | Design Value |
|---|---|
| Logic-controlled shutdown with inverted polarity | SHDN = HIGH disables switching and pulls OUT to GND - simplifies host MCU interface without level-shifting. |
| Ultra-low quiescent current | 50µA typical - enables long-term operation from coin cells or energy-harvesting sources in sensor nodes. |
| High-efficiency charge-pump architecture | 99.9% peak efficiency - reduces heat generation and extends battery runtime in compact portable designs. |
| Minimal external component count | Only two 1µF ceramic capacitors required - eliminates inductors and feedback networks, reducing BOM cost and board area. |
| Low-output-impedance design | 23Ω typical output resistance - supports stable –VIN output for precision analog circuits without post-regulation. |
Applications
| Local Negative Supply from Positive Rail | Small LCD Panel Bias |
|---|---|
|
Use Scenario: Generating –5V from a +5V microcontroller supply to power dual-rail op-amps in a portable data logger. IC Role / Device Role / Timing Role: Voltage inverter providing clean, low-noise negative analog rail; no timing interface required - self-oscillating at 125kHz. Use Value: Eliminates need for inductor-based DC/DC converters; 1nA shutdown current preserves battery life during idle periods. |
Use Scenario: Supplying –15V bias to segment drivers in a 2.7-inch monochrome STN LCD used in industrial handheld terminals. IC Role / Device Role / Timing Role: Charge-pump inverter delivering stable negative voltage; cascaded with second MAX1719EUT+ to reach –2×VIN if needed. Use Value: Enables compact, low-EMI display power solution using only ceramic caps - avoids magnetic interference with touch sensing. |
| GaAs Power Amplifier Bias | Battery-Operated Medical Sensor |
|
Use Scenario: Providing –3.3V gate bias for GaAs FETs in a 2.4GHz ISM-band RF front-end within a portable spectrum analyzer. IC Role / Device Role / Timing Role: High-efficiency inverter supplying precise negative gate voltage; shutdown controlled by RF enable signal. Use Value: 125kHz switching frequency avoids RF band interference; 25mA output sustains bias under pulsed RF load conditions. |
Use Scenario: Creating –2.5V reference rail for a low-power ADC in a wearable ECG patch powered by a CR2032 coin cell. IC Role / Device Role / Timing Role: Ultra-low-quiescent inverter generating precision negative supply; shutdown synchronized with measurement cycles. Use Value: 1nA shutdown current extends shelf life; 50µA active IQ allows >1-year operation on single coin cell at 10s sampling interval. |
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+ | Same 125kHz frequency and 25mA rating, but non-inverted shutdown (SHDN low = shutdown); identical pinout and package. | Suitable where host MCU GPIO defaults to low at reset - avoids unintended startup before firmware configures SHDN. | Select MAX1721EUT+ if system-level logic polarity favors active-low shutdown control; otherwise MAX1719EUT+ provides direct compatibility with active-high wake signals. |
| MAX860ESA+ | Higher 50mA output, µMAX-8 package, no shutdown; requires larger 10µF capacitors and delivers less efficiency at light loads. | Used where higher current is mandatory and board space permits larger caps; unsuitable for ultra-low-power sleep modes. | Choose MAX860ESA+ only when >25mA load current is required and shutdown functionality is implemented externally; MAX1719EUT+ remains optimal for low-IQ, space-constrained designs. |
Compared with MAX1721EUT+, the MAX1719EUT+ offers inverted shutdown control - enabling direct connection to microcontroller wake pins without external inverters - while matching performance in efficiency, output current, and footprint. Against MAX860ESA+, MAX1719EUT+ trades raw current capability for 1nA shutdown, 6-pin SOT23 size, and superior light-load efficiency.
Availability
MAX1719EUT+ is available at Aetrix Electronics and suitable for battery-operated medical sensors, portable RF instrumentation, handheld LCD terminals, and low-power analog signal conditioning requiring stable component supply and long-lifecycle support.
Supply support for MAX1719EUT+ 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 MAX1719EUT+ belongs to Maxim's switched-capacitor voltage inverter product line, engineered specifically for compact, low-noise negative rail generation in battery-powered and space-constrained embedded systems.
FAQ
What is the shutdown behavior of the MAX1719EUT+?
The MAX1719EUT+ features an inverting shutdown input: driving SHDN HIGH places the device in shutdown mode, reducing supply current to 1nA and actively pulling the OUT pin to GND through a 4Ω internal switch. This behavior is confirmed in the Pin Description and Electrical Characteristics tables, and distinguishes it from the MAX1720/MAX1721 variants. During shutdown, switching halts completely, and no charge transfer occurs.
Can the MAX1719EUT+ generate regulated output voltages?
No, the MAX1719EUT+ is an unregulated charge-pump inverter - its output voltage approximates –VIN only under light loads. As load current increases, VOUT droops linearly per VDROOP– = IOUT × RO (RO = 23Ω typ). For regulated outputs such as –2×VIN, Maxim recommends the MAX868, not the MAX1719EUT+. Designers must account for this droop in analog rail sizing.
What capacitor types and values are required for stable operation of the MAX1719EUT+?
The MAX1719EUT+ requires two 1µF ceramic capacitors (X7R or better) with low ESR: C1 (flying capacitor) between C1+ and C1−, and C2 (reservoir capacitor) between OUT and GND. A third 1µF bypass capacitor (C3) is recommended between IN and GND. Tantalum or electrolytic caps are not suitable due to high ESR, which degrades efficiency and increases ripple.
Is the MAX1719EUT+ pin-compatible with other devices in the MAX17xx family?
Yes - the MAX1719EUT+, MAX1720EUT+, and MAX1721EUT+ share identical 6-pin SOT23-6 pinouts and footprints. However, shutdown polarity differs: MAX1719EUT+ uses inverted control (SHDN high = shutdown), while MAX1720/MAX1721 use non-inverted control (SHDN low = shutdown). Swapping them requires logic-level adjustment.
What is the maximum continuous output current specification for the MAX1719EUT+?
The MAX1719EUT+ is rated for 25mA continuous output current under standard operating conditions (TA = –40°C to +85°C, VIN = +5V, C1 = C2 = 1µF). Absolute Maximum Ratings allow 100mA short-term, but sustained operation above 25mA causes excessive droop and thermal stress. Derating is required above +70°C ambient per the 696mW power dissipation limit.
MAX1719EUT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Strip
- Product Status:
- Active
- 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+ FAQ
1.How can I place an order for MAX1719EUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1719EUT+ 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+ reliable?
The price and inventory of MAX1719EUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1719EUT+ is usually 5 days.
3.What payment methods are accepted for MAX1719EUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1719EUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1719EUT+?
MAX1719EUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1719EUT+ 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+?
For technical support, including MAX1719EUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1719EUT+ requirements.
6.How does Aetrix verify that MAX1719EUT+ is sourced from the original manufacturer or authorized distributors?
All MAX1719EUT+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX1719EUT+?
All MAX1719EUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1719EUT+, 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+ part is unused and in its original packaging.
Return procedure for MAX1719EUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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