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Analog Devices Inc./Maxim Integrated MAX77291ANT+T
- Part No.:
- MAX77291ANT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX77291ANT+T.pdf
- Description:
- IC REG BOOST
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Inventory:4,260
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Product details
Overview
MAX77291ANT+T from Analog Devices is a high-voltage, 1A micropower boost DC-DC converter with True Shutdown™, 1.0MHz fixed-frequency operation in CCM, 1.8V–5.5V input range, and programmable 5.5V–20V output. It integrates power switch, power diode, and output load switch, enabling compact sensor power supply designs.
For engineers reviewing the MAX77291ANT+T datasheet, MAX77291ANT+T pinout, MAX77291ANT+T application, or MAX77291ANT+T equivalent, this page delivers verified specifications, validated package mapping, confirmed pin functions, and real-world use context for wearable, medical, and industrial sensor modules requiring ultra-low quiescent current and true input-output isolation.
Technical Context
The MAX77291ANT+T employs current-mode control with adaptive constant off-time and operates in two functional modes: light-load PFM (pulse frequency modulation) for efficiency optimization below ~10mA, and quasi-constant 1.0MHz PWM mode in continuous conduction mode above that threshold. Its internal compensation supports stable regulation across wide VIN/VOUT ratios and component tolerances.
True Shutdown™ disconnects both forward and reverse current paths between IN and OUT using an integrated load switch, achieving ≤50nA shutdown current. Protection features include cycle-by-cycle 1A peak inductor current limiting, output short-circuit recovery with 2μs enforced off-time, and thermal lockout at +165°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, Li-polymer, or multi-cell alkaline/battery-backed systems without pre-regulation. |
| Output Voltage Range | 5.5V to 20V - programmable via external resistor divider; enables direct powering of analog sensors, op-amps, or RF front-ends requiring >5V rails. |
| Peak Inductor Current Limit | 1.0A - sets maximum energy transfer per cycle; determines minimum inductance and ripple handling for 50mA–100mA output loads. |
| Quiescent Supply Current | 28μA - enables multi-year battery life in always-on sensor nodes with intermittent wake-up cycles. |
| Switching Frequency | 1.0MHz - allows use of small 4.7μH–15μH inductors and ceramic capacitors, minimizing PCB footprint in space-constrained wearables. |
| Shutdown Current | ≤50nA - ensures negligible battery drain during system sleep, critical for medical patches and environmental monitors. |
| Soft-Start Time | 2.2ms - limits inrush current into output capacitor, preventing input rail sag and false UVLO triggering during power-up. |
Pinout & Package
The MAX77291ANT+T is packaged in a 2mm × 2mm, 8-pin TDFN (Package Code T822+3C) with exposed pad. Pin functions are electrically and thermally optimized for low-noise, high-efficiency boost operation in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Power Ground | Primary return path for LX switching current; must be connected to exposed pad (EP) at single point to minimize ground bounce. |
| OUT (Pin 2) | Regulated Output | Delivers up to 20V; requires 10μF–22μF ceramic output capacitor close to pin for stability and ripple suppression. |
| POK (Pin 3) | Power-OK Open-Drain Output | Asserts low when VOUT drops below 89.5%–92% of target; requires external pull-up for host microcontroller monitoring. |
| EN (Pin 4) | Active-High Enable | Logic-level control (VIH ≥ 1.2V); enables full regulation or enters True Shutdown™ with ≤50nA supply current. |
| LX (Pin 5) | Switching Node | Connects to inductor; carries high di/dt current; requires tight layout with minimal trace length and no vias to reduce EMI. |
| IN (Pin 6) | Input Supply | Accepts 1.8V–5.5V; bypassed with 22μF ceramic + 1000pF NP0 capacitor directly to GND for transient immunity. |
| AGND (Pin 7) | Analog Ground | Reference for FB and internal error amplifier; tied to EP externally to avoid noise coupling into feedback path. |
| FB (Pin 8) | Feedback Input | Senses voltage divider midpoint; internal 1.25V reference enables precise output programming (e.g., R1=3.48MΩ, R2=402kΩ → 12V). |
Key Features
| Feature | Design Value |
|---|---|
| True Shutdown™ | Zero forward/reverse current between IN and OUT; eliminates standby leakage in battery-powered systems. |
| Integrated Power Diode | Eliminates external Schottky diode, reducing BOM count and solution size by >30% versus discrete boost controllers. |
| Light-Load PFM Mode | Maintains >85% efficiency down to 100μA load, extending runtime in duty-cycled IoT sensor applications. |
| Output Short-Circuit Protection | Self-recovering with 2μs forced off-time; prevents thermal runaway during accidental shorts in field-deployed devices. |
| Thermal Shutdown with Hysteresis | Locks out at +165°C and resumes at +150°C; avoids oscillation near thermal limit during sustained high-power operation. |
Applications
| Wearable Health Monitors | Industrial Sensor Nodes |
|---|---|
|
Use Scenario: Continuous ECG/PPG sensing in wrist-worn patch with coin-cell battery. IC Role / Device Role / Timing Role: Boosts 3.0V battery to stable 12V rail for analog front-end amplifiers and ADC reference. Use Value: 28μA quiescent current extends battery life beyond 12 months; True Shutdown™ cuts leakage to <50nA during sleep intervals. |
Use Scenario: Wireless temperature/humidity node powered by two AA cells in remote factory settings. IC Role / Device Role / Timing Role: Generates 15V bias for MEMS pressure transducer and 5.5V for MCU/RF transceiver from decaying 2.4V–3.2V input. Use Value: 1.0MHz switching enables use of 6.8μH inductor and 12μF ceramic output cap-reducing total solution area to <12mm². |
| Portable Medical Imaging | Smart Home Environmental Sensors |
|
Use Scenario: Handheld ultrasound probe requiring high-voltage bias for piezoelectric transducers. IC Role / Device Role / Timing Role: Delivers regulated 18V output from 3.6V Li-ion cell with soft-start ramp to prevent transducer shock. Use Value: 2.2ms soft-start limits inrush to <150mA; integrated load switch isolates transducer during standby to preserve battery charge. |
Use Scenario: Battery-operated CO₂/NVOC sensor with electrochemical cell demanding 7.5V bias. IC Role / Device Role / Timing Role: Provides precise 7.5V output (via FB divider) with ±1.5% accuracy across -40°C to +125°C ambient. Use Value: 1.25V internal reference and ACCDCM/ACCCCM specs ensure <±2% total output error over temperature and line/load variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS610995YFFR | Lower max output (5.5V), no POK pin, 0.65μA IQ, but includes integrated LDO post-regulator. | Better suited for low-voltage logic rails; unsuitable for >5.5V sensor biasing. | Select only if output ≤5.5V and post-LDO regulation is required; not a drop-in replacement for MAX77291ANT+T's 20V capability. |
| LT3999EMSE#TRPBF | Higher IQ (120μA), 40V max output, external MOSFET drive, no integrated diode or load switch. | Requires external diode and gate driver; larger solution size but supports higher power and wider VIN. | Choose when >20V output or >100mA load is needed; adds complexity but offers greater flexibility in high-stress environments. |
Compared with TPS610995YFFR and LT3999EMSE#TRPBF, the MAX77291ANT+T uniquely combines 20V output, True Shutdown™ isolation, and 28μA quiescent current in a 2mm×2mm TDFN-making it optimal for miniaturized, long-life sensor power where voltage headroom and zero-leakage shutdown are non-negotiable.
Availability
MAX77291ANT+T is available at Aetrix Electronics and suitable for wearable health monitors, portable medical equipment, and industrial sensor nodes requiring stable component supply with guaranteed long-term availability and RoHS-compliant sourcing.
Supply support for MAX77291ANT+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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and healthcare markets since 1965.
The MAX77291ANT+T belongs to Analog Devices' MAX17291 family of micropower boost converters, designed specifically for ultra-low-power, high-voltage sensor biasing in space-constrained, battery-operated edge devices.
FAQ
What is the maximum output voltage supported by the MAX77291ANT+T?
The MAX77291ANT+T supports a programmable output voltage range from 5.5V to 20V, set by an external resistor divider on the FB pin. The upper limit of 20V is guaranteed across the full -40°C to +125°C operating temperature range and under all specified load and input conditions.
Does the MAX77291ANT+T require an external Schottky diode?
No, the MAX77291ANT+T integrates a power diode internally, eliminating the need for an external Schottky diode. This reduces bill-of-materials count, PCB area, and potential failure points-critical for high-reliability wearable and medical applications.
How does True Shutdown™ function in the MAX77291ANT+T?
True Shutdown™ in the MAX77291ANT+T uses an integrated load switch to physically disconnect the OUT pin from the IN pin, blocking both forward and reverse current flow. This achieves ≤50nA shutdown current and prevents backfeed from output capacitors into the input source.
Can the MAX77291ANT+T operate with a 1.8V input supply?
Yes, the MAX77291ANT+T is fully specified to operate from 1.8V to 5.5V input. Its undervoltage lockout (UVLO) has a rising threshold of 1.7V–1.8V with 100mV hysteresis, ensuring reliable startup and regulation even with deeply discharged single-cell batteries.
Is the POK (Power-OK) signal available on all MAX77291ANT+T package variants?
No, the POK pin is exclusive to the TDFN package (e.g., MAX77291ANT+T). The WLP variant lacks POK functionality. For MAX77291ANT+T, POK asserts low when output falls below 89.5%–92% of the programmed voltage and requires an external pull-up resistor for host monitoring.
MAX77291ANT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
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- Voltage - Input (Max):
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- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
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- Grade:
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- Mounting Type:
- -
- Supplier Device Package:
- -
MAX77291ANT+T FAQ
1.How can I place an order for MAX77291ANT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77291ANT+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 MAX77291ANT+T reliable?
The price and inventory of MAX77291ANT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77291ANT+T is usually 5 days.
3.What payment methods are accepted for MAX77291ANT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77291ANT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77291ANT+T?
MAX77291ANT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77291ANT+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 MAX77291ANT+T?
For technical support, including MAX77291ANT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77291ANT+T requirements.
6.How does Aetrix verify that MAX77291ANT+T is sourced from the original manufacturer or authorized distributors?
All MAX77291ANT+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 MAX77291ANT+T meets industry standards.
7.What is the process for return or replacement of MAX77291ANT+T?
All MAX77291ANT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX77291ANT+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 MAX77291ANT+T part is unused and in its original packaging.
Return procedure for MAX77291ANT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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