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Analog Devices Inc./Maxim Integrated MAX1720EUT+T
- Part No.:
- MAX1720EUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1720EUT+T.pdf
- Description:
- IC REG CHARGE PUMP INV 25MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:16,482
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Product details
Overview
The MAX1720EUT+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 a +1.5V to +5.5V input supply. It operates at 12kHz, delivers up to 25mA continuous output current, achieves 99.9% voltage conversion efficiency, and uses only two 10µF external capacitors. It is commonly used to power analog circuitry requiring local –5V from a +5V logic rail.
For engineers reviewing the MAX1720EUT+T datasheet, MAX1720EUT+T pinout, MAX1720EUT+T application, or MAX1720EUT+T equivalent, key selection criteria include shutdown polarity (active-high SHDN), 12kHz oscillator frequency, 50µA quiescent current, 23Ω typical output resistance at +5V input, and SOT23-6 package compatibility with board-level space constraints.
Technical Context
The MAX1720EUT+T implements a two-phase charge-pump topology using four on-chip power MOSFET switches to invert input voltage without inductors. Its oscillator runs at a fixed 12kHz, resulting in lower switching noise and reduced EMI compared to higher-frequency variants like the MAX1721 (125kHz).
Shutdown is active-high: driving SHDN = VIN places the device in low-power mode (<1nA supply current), with OUT actively pulled to GND via a 4Ω internal switch. Output voltage follows VOUT ≈ –(VIN – IOUT × RO), where RO ≈ 23Ω at +5V and room temperature - making load regulation performance highly dependent on output current and capacitor ESR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +1.5V to +5.5V - supports single-cell Li-ion, alkaline, and standard logic rails. |
| Oscillator Frequency | 12kHz - enables use of larger, lower-ESR ceramic capacitors and reduces high-frequency noise. |
| Output Current | 25mA continuous - sufficient for biasing op-amps, ADCs, or small LCD bias supplies. |
| Quiescent Current | 50µA - minimizes standby power in battery-critical applications. |
| Voltage Conversion Efficiency | 99.9% - ensures minimal power loss during inversion, critical for energy-constrained systems. |
| Shutdown Supply Current | <1nA - enables ultra-low-power sleep modes in portable equipment. |
| Output Resistance | 23Ω (typ, VIN = +5V) - defines load regulation: ~0.575V droop at 25mA output. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and extended commercial environments. |
Pinout & Package
The MAX1720EUT+T is housed in a 6-pin SOT23-6 package with exposed pad (not thermally enhanced), footprint compatible across the MAX1719/MAX1720/MAX1721 family. Pin 1 is C1+, pin 2 is C1–, pin 3 is IN, pin 4 is SHDN, pin 5 is OUT, and pin 6 is GND - confirmed by Maxim's official pin diagram and top-marking code AABS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1+ | Positive terminal of flying capacitor | Connects to one side of external pump capacitor C1; forms charge-transfer node in first half-cycle. |
| C1– | Negative terminal of flying capacitor | Connects to other side of C1; level-shifted downward by VIN during second half-cycle to generate inverted output. |
| IN | Positive input supply | Accepts +1.5V to +5.5V unregulated input; powers internal oscillator and switches. |
| SHDN | Active-high shutdown control | Drive high (≥VIN) for shutdown: halts switching, pulls OUT to GND via 4Ω, draws <1nA. |
| OUT | Inverting charge-pump output | Delivers –VIN (e.g., –5V from +5V) with load-dependent droop governed by 23Ω output resistance. |
| GND | Analog/digital ground reference | Common return for IN, OUT, and internal circuitry; must be low-impedance for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Logic-controlled shutdown | Active-high SHDN enables precise system-level power sequencing and <1nA off-state current. |
| Ultra-small SOT23-6 package | 6-pin footprint occupies <2.5mm² PCB area - ideal for space-constrained handheld and wearable designs. |
| High-efficiency charge pump | 99.9% conversion efficiency minimizes thermal rise and extends battery life in portable devices. |
| Low-quiescent-current operation | 50µA ICC at +5V allows long-term operation from coin cells or energy-harvesting sources. |
| Minimal external components | Only two 10µF ceramic capacitors required - eliminates inductors and simplifies BOM and layout. |
| Fixed 12kHz switching frequency | Enables predictable EMI filtering and compatibility with low-cost, high-capacitance MLCCs. |
Applications
| Local Negative Supply Generation | Small LCD Panel Bias |
|---|---|
Use Scenario: Generating –5V from a +5V microcontroller supply to power op-amps or precision analog front-ends on a compact sensor board. IC Role / Device Role / Timing Role: Voltage inverter providing isolated negative rail without magnetics or LDO overhead. Use Value: Eliminates need for dual-output DC/DC or transformer-based solutions, reducing cost and board area by >40%. | Use Scenario: Supplying –15V bias to segment drivers in a 2.8-inch monochrome STN LCD module powered from a single 3.3V rail. IC Role / Device Role / Timing Role: Charge-pump inverter delivering stable negative voltage with low ripple under pulsed load conditions. Use Value: Enables single-supply LCD operation with 12kHz switching frequency minimizing visible display noise. |
| GaAs PA Bias Supply | Battery-Operated Portable Instrumentation |
Use Scenario: Providing –3.5V gate bias to GaAs FET power amplifiers in a handheld RF test probe operating from two AA cells. IC Role / Device Role / Timing Role: Low-noise, shutdown-capable inverter supporting rapid PA enable/disable cycles. Use Value: Active-high SHDN synchronizes with PA control logic, cutting bias leakage to sub-nA between transmissions. | Use Scenario: Powering ±2.5V references and signal-conditioning circuitry in a handheld multimeter running on three AAA batteries. IC Role / Device Role / Timing Role: Efficient, low-IQ inverter extending battery life while maintaining analog accuracy over full voltage range (1.5V–4.5V). Use Value: 50µA quiescent current and 99.9% efficiency preserve runtime even at light loads typical of measurement standby. |
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 | 125kHz oscillator, 1µF external capacitors, 100µA ICC, same 6-pin SOT23-6 package and pinout. | Better suited for space-constrained designs needing smaller caps; higher frequency increases EMI risk. | Select MAX1721EUT+T when board area limits capacitor size and EMI filtering is feasible. |
| MAX860ESA+ | 50mA output, µMAX-8 package, no shutdown, requires 2.7V–5.5V input, regulated –2×VIN option available. | Higher power delivery but lacks shutdown and uses different package/pinout - not drop-in. | Choose MAX860ESA+ only if >25mA output is required and shutdown functionality is handled externally. |
Compared with MAX1720EUT+T, the MAX1721EUT+T offers faster switching and smaller external components but trades off higher quiescent current and increased noise sensitivity; the MAX860ESA+ provides greater output current and regulation flexibility but sacrifices shutdown control and requires PCB redesign due to package and pinout differences.
Availability
MAX1720EUT+T is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical devices, and industrial sensor nodes requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX1720EUT+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, communications, and consumer applications.
The MAX1719/MAX1720/MAX1721 product line was designed specifically for ultra-compact, low-power voltage inversion in space- and energy-constrained portable electronics - emphasizing minimal external components, logic-controllable shutdown, and robust operation across wide input voltage ranges.
FAQ
What is the shutdown polarity of the MAX1720EUT+T?
The MAX1720EUT+T features an active-high shutdown input: driving SHDN to VIN (or ≥2.0V) disables switching, pulls OUT to GND via a 4Ω internal switch, and reduces supply current to <1nA. This differs from the MAX1719 (active-low) and matches the MAX1721. Confirming correct logic level alignment is essential before integration.
What external capacitors are required for the MAX1720EUT+T?
The MAX1720EUT+T requires two 10µF ceramic capacitors: C1 (flying capacitor) between C1+ and C1– pins, and C2 (output reservoir) between OUT and GND. A third 10µF bypass capacitor (C3) across IN and GND is recommended. All must be low-ESR X7R or better to maintain 23Ω output resistance and minimize ripple.
Can the MAX1720EUT+T generate regulated output voltages?
No, the MAX1720EUT+T is an unregulated charge-pump inverter: its output voltage approximates –VIN but droops linearly with load current (VOUT = –(VIN – IOUT × RO)). For regulated –2×VIN outputs, Maxim recommends the MAX868; for regulated –VIN, consider LDO-based solutions or feedback-controlled inverters outside this family.
What is the maximum continuous output current of the MAX1720EUT+T?
The MAX1720EUT+T delivers up to 25mA continuous output current under typical conditions (VIN = +5V, TA = +25°C, C1 = C2 = 10µF). Absolute maximum rated output current is 100mA, but sustained operation above 25mA causes significant voltage droop (>0.5V) and thermal stress - derating is advised for reliability.
Is the MAX1720EUT+T pin-compatible with other devices in its family?
Yes, the MAX1720EUT+T shares identical 6-pin SOT23-6 pinout and footprint with MAX1719EUT+T and MAX1721EUT+T. However, shutdown polarity (active-high vs. active-low) and oscillator frequency (12kHz vs. 125kHz) differ - direct substitution requires verification of control logic timing and capacitor selection.
MAX1720EUT+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:
- 6kHz ~ 21kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX1720EUT+T FAQ
1.How can I place an order for MAX1720EUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1720EUT+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 MAX1720EUT+T reliable?
The price and inventory of MAX1720EUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1720EUT+T is usually 5 days.
3.What payment methods are accepted for MAX1720EUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1720EUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1720EUT+T?
MAX1720EUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1720EUT+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 MAX1720EUT+T?
For technical support, including MAX1720EUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1720EUT+T requirements.
6.How does Aetrix verify that MAX1720EUT+T is sourced from the original manufacturer or authorized distributors?
All MAX1720EUT+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 MAX1720EUT+T meets industry standards.
7.What is the process for return or replacement of MAX1720EUT+T?
All MAX1720EUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1720EUT+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 MAX1720EUT+T part is unused and in its original packaging.
Return procedure for MAX1720EUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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