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Analog Devices Inc./Maxim Integrated MAX1722EZK+T
- Part No.:
- MAX1722EZK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MAX1722EZK+T.pdf
- Description:
- IC REG BOOST ADJ 400MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,018
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Product details
Overview
MAX1722EZK+T from Maxim Integrated is a compact, high-efficiency step-up DC-DC converter in a 5-pin TSOT package, featuring 1.5μA quiescent supply current, 0.91V guaranteed startup voltage, and ±1% output voltage accuracy. It delivers up to 150mA output current with adjustable output (2V–5.5V) and operates from 0.8V–5.5V input-ideal for single-cell alkaline/NiMH or Li+ battery-powered remote controls and medical sensors.
For engineers reviewing the MAX1722EZK+T datasheet, MAX1722EZK+T pinout, MAX1722EZK+T application, or MAX1722EZK+T equivalent, key selection considerations include ultra-low IQ operation, fixed vs. adjustable output configuration, EMI suppression capability, shutdown control presence, and TSOT package thermal performance under light-load conditions.
Technical Context
The MAX1722EZK+T uses a forced discontinuous, current-limited pulse-frequency-modulation (PFM) control scheme with no oscillator-switching frequency varies dynamically with load. Its internal N-channel power switch (0.5Ω RDS(ON)) and P-channel synchronous rectifier eliminate external diodes, reducing losses and board area.
A dedicated low-voltage startup circuit powered from the BATT pin enables reliable operation down to 0.91V input, while integrated damping switch suppresses LX node ringing to reduce EMI without degrading efficiency. Feedback regulation is based on a 1.235V reference with ≤20nA bias current into FB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 1.5μA into OUT - enables >1-year battery life in always-on sensor nodes powered by single AA/AAA cells. |
| Startup Voltage | 0.91V (min) at +25°C - supports full functionality even as alkaline cell voltage drops below 1.0V. |
| Output Voltage Range | Adjustable 2.0V to 5.5V via external resistor divider - allows precise rail matching for MCU, RF transceiver, or display bias needs. |
| Input Voltage Range | 0.8V to 5.5V - compatible with one or two alkaline/NiMH cells or single Li+ cell across full discharge curve. |
| Max Output Current | 150mA at VIN = 1.5V, VOUT = 3.3V - sufficient to drive BLE radios, OLED displays, or optical sensors in portable devices. |
| Efficiency | Up to 90% at mid-load - minimizes thermal rise in sealed enclosures and extends usable battery capacity. |
| Package | 5-pin TSOT (0.9mm height, 1.6mm × 1.6mm footprint) - enables ultra-compact PCB layouts in space-constrained wearables. |
Pinout & Package
MAX1722EZK+T is housed in a 5-pin Thin SOT (TSOT) package with 0.65mm pitch and 0.9mm typical height. Pin 1 is marked with a dot; pin numbering follows standard TSOT top-view convention (counterclockwise from mark).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| BATT | Battery input and damping switch connection | Primary power input path; powers startup circuit directly-enables lowest possible startup voltage and damps LX ringing during light-load operation. |
| SHDN | Shutdown input (active-high) | Drives high for normal operation; drives low to disable switching and reduce supply current to <0.5μA-no external pull-up required. |
| GND | Ground reference | Common return for power, feedback, and control circuits; must be connected to low-impedance ground plane within 5mm of IC and capacitor GND pads. |
| FB | Feedback input | Senses output voltage via resistor divider; regulates output to 1.235V at FB pin-sets VOUT = 1.235V × (1 + R1/R2) with ≤20nA input bias. |
| OUT | Power output and bootstrap supply | Delivers regulated output; also supplies internal gate drivers-requires low-ESR ceramic capacitor (≥10μF) placed adjacent to pin. |
| LX | Switch node | Drain of internal N-channel MOSFET and P-channel synchronous rectifier-connects to inductor; requires short, low-inductance trace to minimize EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated P-channel MOSFET replaces external Schottky diode-reduces conduction loss by ~0.3V, improves efficiency ≥5% at 50mA, and saves 1.5mm² board area. |
| EMI-suppressing damping switch | Active clamp on BATT pin dissipates inductor ring energy-lowers peak radiated emissions by 10–15dB without adding components or compromising efficiency. |
| Ultra-low IQ PFM control | No fixed-frequency oscillator; only pulses when output droops-maintains >80% efficiency down to 10μA load, critical for intermittent-sensing applications. |
| 0.91V guaranteed startup | Startup circuit powered from BATT pin-not OUT-ensures reliable initialization even when battery voltage falls below regulator threshold before first switching cycle. |
| Adjustable output architecture | FB pin accepts standard resistor divider-supports any output between 2.0V and 5.5V with ±1% accuracy over temperature, eliminating need for multiple fixed-voltage SKUs. |
Applications
| Remote Wireless Transmitters | Personal Medical Devices |
|---|---|
Use Scenario: Battery-powered sub-GHz ISM band transmitters in glucose monitors or pulse oximeters operating intermittently for weeks on a single coin cell. IC Role / Device Role / Timing Role: Step-up converter supplying stable 3.3V rail to RF IC and microcontroller during brief transmission bursts. Use Value: 1.5μA quiescent current extends shelf life and operational runtime; 0.91V startup ensures full functionality until battery reaches end-of-life voltage (~0.85V). |
Use Scenario: Portable ECG patch with continuous analog front-end and Bluetooth LE connectivity, requiring clean, low-noise 2.8V supply for ADC and RF sections. IC Role / Device Role / Timing Role: Primary power converter generating regulated output from single Li+ cell, with synchronous rectification minimizing thermal signature. Use Value: Up to 90% efficiency reduces self-heating in skin-contact device; TSOT package enables thin-profile design compliant with IEC 60601 leakage current limits. |
| Digital Still Cameras | Low-Power Hand-Held Instruments |
Use Scenario: Compact point-and-shoot cameras using single alkaline AA battery to power image sensor, flash LED driver, and LCD backlight. IC Role / Device Role / Timing Role: Adjustable-output boost converter delivering 5.0V to white LED strings and 3.3V to sensor interface logic. Use Value: Wide 0.8V–5.5V input range accommodates full alkaline discharge curve; EMI suppression prevents noise coupling into analog video signal path. |
Use Scenario: Handheld multimeter or environmental sensor logger powered by two AAA cells, requiring stable 3.3V for precision ADC and wireless telemetry. IC Role / Device Role / Timing Role: High-efficiency voltage booster enabling accurate measurements across entire battery life without recalibration drift. Use Value: ±1% output accuracy maintains ADC reference stability; 150mA output headroom supports simultaneous sensor excitation and radio transmission. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1724EZK33+T | Fixed 3.3V output; includes active-low SHDN and internal damping switch-same TSOT package and startup voltage. | Eliminates external feedback resistors but lacks output flexibility; better suited for designs with fixed rail requirements and strict EMI targets. | Select MAX1724EZK33+T when 3.3V is mandatory and board space for feedback network is constrained; verify SHDN logic compatibility (active-low vs. MAX1722EZK+T's active-high). |
| Texas Instruments TPS61200DRCR | 0.9V min input; 1.2μA IQ; 5-pin VSON package; no integrated damping switch; requires external diode for synchronous operation. | Higher max output current (300mA), but lacks EMI suppression circuitry-may require additional filtering in noise-sensitive applications. | Choose TPS61200DRCR for higher current demand or lower IQ requirement; add external Schottky diode and LC filter if EMI compliance is critical. |
Compared with MAX1722EZK+T, MAX1724EZK33+T trades adjustability for simplified layout and enhanced EMI control, while TPS61200DRCR offers higher output current and lower IQ but increases BOM count and EMI risk due to missing damping and synchronous rectifier integration.
Availability
MAX1722EZK+T is available at Aetrix Electronics and suitable for remote wireless transmitters, personal medical devices, and low-power hand-held instruments requiring stable component supply across multi-year production cycles.
Supply support for MAX1722EZK+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 industrial, medical, and consumer applications.
The MAX1722/MAX1723/MAX1724 family was engineered specifically for ultra-low-power, single-cell battery systems where size, efficiency, and startup voltage are primary constraints-targeting wearables, IoT edge nodes, and portable diagnostics.
FAQ
What is the minimum input voltage required for MAX1722EZK+T to start up?
The MAX1722EZK+T guarantees startup at 0.91V (min) at +25°C with no load, and operates continuously down to 0.8V input. This is enabled by a dedicated startup circuit powered directly from the BATT pin-critical for maintaining function as alkaline or NiMH cells discharge below 1.0V. The actual startup voltage rises slightly under load or at temperature extremes.
Does MAX1722EZK+T include a shutdown feature, and how is it controlled?
Yes, MAX1722EZK+T features an active-high shutdown input (SHDN pin). Driving SHDN high enables normal operation; pulling it low disables switching and reduces quiescent current to <0.5μA. Unlike MAX1723/MAX1724, MAX1722EZK+T does not include logic-level shutdown threshold specifications-designs should ensure SHDN is driven fully to VOUT or a clean logic high.
How do I set the output voltage for MAX1722EZK+T?
MAX1722EZK+T uses a resistor divider on the FB pin to set output voltage: VOUT = 1.235V × (1 + R1/R2). Select R1 between 100kΩ and 1MΩ to limit FB bias current error; calculate R2 accordingly. For example, for 3.3V output, R1 = 1MΩ yields R2 ≈ 1.67MΩ. Layout requires short, direct traces to FB with guard ring to minimize noise coupling.
What package type and dimensions does MAX1722EZK+T use?
MAX1722EZK+T is supplied in a 5-pin Thin SOT (TSOT) package measuring 1.6mm × 1.6mm × 0.9mm (typical height), with 0.65mm pin pitch and pin 1 marked by a dot. It is RoHS-compliant and tape-and-reel packaged (+T suffix). Footprint matches JEDEC MO-178AC outline; land pattern code is 90-0241 per Maxim's package documentation.
Is synchronous rectification integrated into MAX1722EZK+T, and what benefit does it provide?
Yes, MAX1722EZK+T integrates both an N-channel main switch and a P-channel synchronous rectifier-eliminating the need for an external Schottky diode. This reduces forward voltage drop from ~0.3V to <0.1V, improving light-load efficiency by 5–10%, lowering thermal dissipation, and saving PCB area. No external components are required to enable this function.
MAX1722EZK+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 400mA (Switch)
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
MAX1722EZK+T FAQ
1.How can I place an order for MAX1722EZK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1722EZK+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 MAX1722EZK+T reliable?
The price and inventory of MAX1722EZK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1722EZK+T is usually 5 days.
3.What payment methods are accepted for MAX1722EZK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1722EZK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1722EZK+T?
MAX1722EZK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1722EZK+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 MAX1722EZK+T?
For technical support, including MAX1722EZK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1722EZK+T requirements.
6.How does Aetrix verify that MAX1722EZK+T is sourced from the original manufacturer or authorized distributors?
All MAX1722EZK+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 MAX1722EZK+T meets industry standards.
7.What is the process for return or replacement of MAX1722EZK+T?
All MAX1722EZK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1722EZK+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 MAX1722EZK+T part is unused and in its original packaging.
Return procedure for MAX1722EZK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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