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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:3,889
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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 from a positive input supply. It operates at 12kHz, supports +1.5V to +5.5V input, delivers up to 25mA continuous output current, achieves 99.9% voltage conversion efficiency, and uses only two external 10µF capacitors. It is commonly used to power analog circuitry requiring a local -5V rail from a +5V logic supply.
For engineers reviewing the MAX1720EUT-T datasheet, MAX1720EUT-T pinout, MAX1720EUT-T application, or MAX1720EUT-T equivalent, key selection criteria include oscillator frequency (12kHz), quiescent current (50µA), shutdown supply current (1nA), output resistance (23Ω), and SOT23-6 package compatibility for space-constrained portable designs.
Technical Context
The MAX1720EUT-T implements a two-phase charge-pump topology using four on-chip power MOSFET switches to invert the input voltage with minimal external components. Its fixed 12kHz oscillator frequency enables predictable ripple and EMI behavior, while its noninverting shutdown input (SHDN driven high for normal operation) actively pulls OUT to GND during shutdown via a 4Ω internal switch.
Unlike regulated converters, the MAX1720EUT-T provides unregulated inversion: VOUT ≈ –VIN under light load but droops as IOUT increases due to its 23Ω typical output resistance (RO). Output voltage deviation follows VDROOP– = IOUT × RO, making it suitable for applications tolerant of moderate load regulation error.
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-cost ceramic capacitors and reduces EMI compared to 125kHz variants. |
| Output Current | 25mA continuous - sufficient for biasing op-amps, sensors, or small LCD bias circuits. |
| Quiescent Current | 50µA - minimizes standby power in battery-operated systems. |
| Voltage Conversion Efficiency | 99.9% - maximizes energy transfer from input to inverted output under light loads. |
| Shutdown Supply Current | 1nA - ensures negligible battery drain during system sleep modes. |
| Output Resistance | 23Ω - determines output voltage droop (e.g., 25mA load causes ~0.575V drop from ideal –VIN). |
| Capacitor Requirement | Two 10µF capacitors - C1 (flying) and C2 (reservoir); low-ESR ceramics recommended for lowest RO. |
Pinout & Package
MAX1720EUT-T is housed in a 6-pin SOT23-6 package with exposed pad (not thermally enhanced), footprint compatible across MAX1719/MAX1720/MAX1721 family members. Pin 1 is marked with a dot; pin numbering follows standard SOT23 top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - C1+ | Positive terminal of flying capacitor | Connects to one side of external flying capacitor C1; switching node critical for charge transfer timing. |
| 2 - C1− | Negative terminal of flying capacitor | Connects to other side of C1; forms charge-transfer path with C1+ during pump cycles. |
| 3 - IN | Positive input supply | Accepts +1.5V to +5.5V; powers internal oscillator and switches; requires local bypass (C3 = 10µF). |
| 4 - SHDN | Noninverting shutdown control | Drive high for normal operation; drive low to halt switching and pull OUT to GND via 4Ω switch. |
| 5 - OUT | Inverting charge-pump output | Delivers inverted voltage (≈ –VIN) with 23Ω output impedance; connects to load and reservoir capacitor C2. |
| 6 - GND | Ground reference | Common return for IN, OUT, SHDN, and internal circuitry; must be low-impedance for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Logic-Controlled Shutdown | 1nA shutdown current and active GND pull-down on OUT enable ultra-low-power system sleep states. |
| Ultra-Small Footprint | 6-pin SOT23-6 package occupies <1.6mm² PCB area - ideal for wearables and handheld devices. |
| High Conversion Efficiency | 99.9% efficiency at light loads preserves battery life in always-on sensor nodes and portable instrumentation. |
| Minimal External Components | Only two 10µF ceramic capacitors required - eliminates inductors and simplifies BOM vs. inductive DC/DC inverters. |
| Predictable Low-Frequency Operation | Fixed 12kHz oscillator allows precise EMI filtering and avoids sensitive RF bands common in wireless modules. |
Applications
| Local Negative Supply from Positive Rail | Small LCD Panel Bias |
|---|---|
Use Scenario: Generating –5V from a +5V microcontroller supply to power op-amps and precision ADC references in a data acquisition module. IC Role / Device Role / Timing Role: Voltage inverter providing isolated negative rail without magnetic components; no timing interface required. Use Value: Eliminates need for bulky inductors or dual-output regulators, reducing solution size by >40% versus inductive alternatives. | 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 for LCD contrast control; operates independently of host processor clock. Use Value: Enables single-supply design with 100% duty-cycle operation and <1mVp-p ripple when paired with 10µF X7R ceramics. |
| GaAs PA Bias Supply | Battery-Operated Portable Instrumentation |
Use Scenario: Providing –3.3V gate bias to GaAs FET power amplifiers in a compact UHF transmitter module. IC Role / Device Role / Timing Role: High-efficiency inverter supplying clean negative bias; shutdown controlled by RF enable signal. Use Value: Achieves 99.5% efficiency at 15mA load, minimizing thermal rise near heat-sensitive RF components. | Use Scenario: Powering analog front-end circuitry (sensor signal conditioning, reference buffers) in a handheld multimeter running on two AA cells. IC Role / Device Role / Timing Role: Inverting +3.0V nominal battery voltage to –3.0V rail; shutdown synchronized with measurement cycle. Use Value: 1nA shutdown current extends battery life to >12 months in standby, while 50µA quiescent current maintains fast wake-up. |
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 | 125kHz oscillator, 1µF capacitors, 100µA quiescent current, same 6-pin SOT23-6 package. | Better suited for space-constrained designs needing smaller capacitors; higher switching noise may require additional filtering. | Select MAX1721EUT-T when board area is critical and EMI filtering is feasible; avoid if operating near sensitive RF receivers. |
| MAX860ESA+ | Regulated inverter, ±5V output, 50mA output, µMAX-8 package, requires external resistor for setpoint. | Provides stable –5V regardless of load or input variation; supports higher current but needs more PCB area and external component. | Choose MAX860ESA+ when load regulation <1% is mandatory or output current exceeds 25mA; not drop-in compatible. |
Compared with MAX1720EUT-T, MAX1721EUT-T offers higher frequency and smaller capacitors but trades off EMI performance and quiescent current, while MAX860ESA+ adds regulation and current capability at the cost of complexity and footprint - making MAX1720EUT-T optimal for cost-sensitive, low-noise, moderate-current inverter needs.
Availability
MAX1720EUT-T is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical devices, and industrial handheld terminals requiring stable component supply and long-term lifecycle support.
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 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-quiescent-current switched-capacitor voltage inversion in space- and power-constrained portable electronics.
FAQ
What is the oscillator frequency of the MAX1720EUT-T?
The MAX1720EUT-T operates at a fixed 12kHz oscillator frequency. This low-frequency operation reduces electromagnetic interference and allows the use of larger, lower-cost ceramic capacitors (10µF) compared to the 125kHz MAX1721EUT-T. The frequency is internally generated and not user-adjustable; it remains stable across temperature and input voltage variations within the specified operating range.
How does the shutdown function work on the MAX1720EUT-T?
The MAX1720EUT-T features a noninverting shutdown input (SHDN pin): driving SHDN low disables the internal oscillator, reduces supply current to 1nA, and actively pulls the OUT pin to GND through a 4Ω internal switch. This ensures the output is safely clamped during system sleep. Unlike the MAX1719EUT-T (inverting SHDN), the MAX1720EUT-T requires a logic-low signal to enter shutdown mode.
What is the maximum continuous output current of the MAX1720EUT-T?
The MAX1720EUT-T delivers up to 25mA continuous output current into a resistive load. This rating assumes proper capacitor selection (10µF low-ESR ceramics for both C1 and C2), ambient temperature ≤+85°C, and adequate PCB copper area for thermal dissipation. At 25mA, output voltage droop is approximately 0.575V (25mA × 23Ω RO), so actual VOUT ≈ –(VIN – 0.575V) under full load.
Which external capacitors are required for stable operation of the MAX1720EUT-T?
The MAX1720EUT-T requires two external capacitors: a 10µF flying capacitor (C1) between C1+ and C1− pins, and a 10µF reservoir capacitor (C2) between OUT and GND. A third 10µF bypass capacitor (C3) is recommended between IN and GND. All three should be X7R or better ceramic types with low ESR (<1Ω) to minimize output resistance and ripple; tantalum or electrolytic capacitors are not recommended due to higher ESR.
Is the MAX1720EUT-T pin-compatible with other devices in the MAX1719/MAX1720/MAX1721 family?
Yes, the MAX1720EUT-T is fully pin-compatible with MAX1719EUT-T and MAX1721EUT-T in the 6-pin SOT23-6 package. All share identical pinout (C1+, C1−, IN, SHDN, OUT, GND), footprint, and thermal characteristics. However, SHDN polarity differs (MAX1719 is inverting), and oscillator frequency/capacitor requirements vary - so direct substitution requires validation of control logic and external component values.
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:
- 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:
- 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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