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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:9,763
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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 (e.g., -5V from +5V) for analog circuitry. It operates at 125kHz, accepts 1.5V–5.5V input, delivers up to 25mA continuous output current, and achieves 99.9% voltage conversion efficiency using only two 1µF external capacitors.
For engineers reviewing the MAX1719EUT+T datasheet, MAX1719EUT+T pinout, MAX1719EUT+T application, or MAX1719EUT+T equivalent, this device is selected for ultra-small footprint battery-powered systems requiring low-quiescent-current negative bias generation with active ground pull during shutdown.
Technical Context
The MAX1719EUT+T implements a four-switch charge-pump topology with internal oscillator and MOSFET drivers. Its inverted shutdown logic (SHDN high = shutdown) actively pulls OUT to GND via a 4Ω internal switch, enabling safe discharge of downstream capacitance.
Output voltage follows VOUT ≈ –VIN – (IOUT × RO), where RO is ~23Ω at +25°C and VIN = +5V. Efficiency is dominated by quiescent current (50µA typical) at light loads and output resistance at heavier loads, with no regulation-output droop is linear with load current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 125kHz - determines switching period, capacitor sizing, and ripple frequency |
| Input Voltage Range | +1.5V to +5.5V - supports single-cell Li-ion, alkaline, and 3.3V/5V logic rails |
| Output Current | 25mA continuous - sufficient for op-amp bias, LCD contrast, or GaAs PA bias |
| Voltage Conversion Efficiency | 99.9% typical - minimizes power loss and thermal rise in space-constrained designs |
| Quiescent Current | 50µA - enables long battery life in always-on monitoring circuits |
| Shutdown Supply Current | 1nA - near-zero leakage during system sleep modes |
| Output Resistance | 23Ω typical at +25°C - defines output droop: ~0.575V drop at 25mA load |
Pinout & Package
MAX1719EUT+T is housed in a 6-pin SOT23-6 package with exposed pad (not electrically connected), optimized for minimal PCB area and thermal performance in portable applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - C1+ | Positive terminal of flying capacitor | Connects to top plate of charge-transfer capacitor; critical path for pump efficiency |
| 2 - C1− | Negative terminal of flying capacitor | Connects to bottom plate; forms charge-transfer loop with C1+ |
| 3 - IN | Positive supply input | Accepts 1.5V–5.5V; powers internal oscillator and switches |
| 4 - SHDN | Inverting shutdown control | Logic high = shutdown (OUT pulled to GND); logic low = active |
| 5 - OUT | Inverting charge-pump output | Delivers negative voltage ≈ –VIN; output impedance dominates load regulation |
| 6 - GND | Ground reference | Common return for IN, OUT, and internal switches; must be low-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Inverted shutdown logic | SHDN high forces OUT to GND via 4Ω switch - ensures safe discharge and prevents floating negative rail |
| Ultra-low shutdown current | 1nA max - extends shelf life and battery runtime in infrequently powered systems |
| Minimal external components | Only two 1µF ceramic capacitors required - reduces BOM count and board area vs. inductor-based solutions |
| High-frequency operation | 125kHz switching - enables smaller capacitors and lower output ripple vs. 12kHz alternatives |
| Wide input range | 1.5V–5.5V - supports single-cell, dual-cell, and standard logic supplies without pre-regulation |
Applications
| Local Negative Supply from Positive Rail | Small LCD Panels |
|---|---|
Use Scenario: Generating –5V from a +5V microcontroller supply to power op-amps or ADC reference buffers in handheld instrumentation. IC Role / Device Role / Timing Role: Voltage inverter providing isolated negative bias; no timing function beyond internal 125kHz oscillator. Use Value: Eliminates need for discrete inductor-based converters, reducing solution size by >60% and EMI emissions. | Use Scenario: Supplying contrast voltage (–3V to –15V) for STN or segment LCDs in medical wearables and portable test equipment. IC Role / Device Role / Timing Role: Charge-pump inverter delivering stable negative bias; output adjusted via external resistor divider on VOUT. Use Value: Enables crisp display contrast with <10mVp-p ripple using 1µF ceramics, meeting visual quality requirements. |
| GaAs PA Bias Supply | Battery-Operated Equipment |
Use Scenario: Providing –3V gate bias for GaAs FET power amplifiers in UHF RFID readers and IoT transceivers. IC Role / Device Role / Timing Role: Low-noise negative voltage source; shutdown controlled by RF enable signal to minimize standby drain. Use Value: 1nA shutdown current extends coin-cell life to >10 years in intermittent-use devices. | Use Scenario: Powering analog front-ends in portable gas detectors, where 25mA peak load occurs during sensor excitation cycles. IC Role / Device Role / Timing Role: Efficient negative rail generator; startup time <80µs ensures fast system wake-up from deep sleep. Use Value: 99.9% efficiency at 5mA load preserves battery capacity over thousands of measurement cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1721EUT+T | Same 125kHz frequency and 25mA rating, but non-inverted shutdown (SHDN low = shutdown) | Requires inverted control logic; unsuitable where existing firmware drives SHDN high for active mode | Select when system-level control aligns with standard active-low shutdown signaling |
| MAX860ESA+ | Delivers 50mA output, µMAX-8 package, no shutdown, higher quiescent current (100µA) | Higher power capability but lacks shutdown and occupies larger footprint; requires different capacitor values | Choose for applications needing >25mA or where shutdown is managed externally |
Compared with MAX1719EUT+T, MAX1721EUT+T offers identical performance but reversed shutdown polarity-critical for firmware compatibility-while MAX860ESA+ trades shutdown and size for doubled output current, making it suitable only where load exceeds 25mA and board area permits.
Availability
MAX1719EUT+T is available at Aetrix Electronics and suitable for battery-operated equipment, small LCD panels, GaAs PA bias supply, and local negative supply generation requiring stable component supply across industrial temperature ranges (–40°C to +85°C).
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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX1719/MAX1720/MAX1721 family targets ultra-compact, low-power voltage inversion in space- and energy-constrained portable systems, emphasizing minimal external components and nanoscale shutdown current.
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 and reducing supply current to 1nA maximum. During shutdown, the OUT pin is actively pulled to GND through an internal 4Ω switch-ensuring safe discharge of downstream capacitance and preventing floating negative rails. This behavior is distinct from the MAX1720/MAX1721 variants, which use non-inverted shutdown.
Can the MAX1719EUT+T generate regulated output voltages?
No, the MAX1719EUT+T is an unregulated charge-pump inverter. Its output voltage approximates –VIN but droops linearly under load per VDROOP– = IOUT × RO (RO ≈ 23Ω at +25°C). For example, at 25mA load and VIN = +5V, VOUT ≈ –4.425V. Regulation requires external feedback or a dedicated regulator like the MAX868; the MAX1719EUT+T provides efficient inversion only.
What capacitor types and values are recommended for the MAX1719EUT+T?
The MAX1719EUT+T requires two 1µF ceramic capacitors (X7R or better) for C1 (flying) and C2 (output), plus a 1µF bypass capacitor C3 on IN. Low-ESR ceramics minimize output resistance and ripple; tantalum or electrolytic capacitors are not recommended due to higher ESR. Capacitor voltage rating must exceed |VOUT| + 20% margin (e.g., 10V for –5V output).
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 (VIN = +5V). This causes greater output droop at elevated temperatures-for instance, 25mA load yields ~0.75V droop at +85°C versus ~0.5V at +25°C. Designers must verify worst-case VOUT across the full –40°C to +85°C range using RO vs. temperature curves in the datasheet.
Is the MAX1719EUT+T pin-compatible with other devices in its family?
Yes, the MAX1719EUT+T shares identical 6-pin SOT23-6 pinout and package with MAX1720EUT+T and MAX1721EUT+T, enabling drop-in replacement for frequency or shutdown logic changes. However, MAX1719EUT+T (125kHz, inverted SHDN) is not functionally interchangeable with MAX1720EUT+T (12kHz, non-inverted SHDN) without firmware and capacitor value adjustments.
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:
- 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+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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