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Analog Devices Inc./Maxim Integrated MAX1723EZK
- Part No.:
- MAX1723EZK
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MAX1723EZK.pdf
- Description:
- IC REG BOOST ADJ 150MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:283
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Product details
Overview
MAX1723EZK from Maxim Integrated is a 1.5µA quiescent current, adjustable-output step-up DC-DC converter in a 5-pin TSOT package. It operates from 0.8V to 5.5V input, delivers up to 150mA output current, features ±1% output voltage accuracy, and supports shutdown with 0.1µA supply current-ideal for single-cell battery-powered medical sensors and remote wireless transmitters.
For engineers reviewing the MAX1723EZK datasheet, MAX1723EZK pinout, MAX1723EZK application, or MAX1723EZK equivalent, key selection criteria include its adjustable output (2V–5.5V), guaranteed 0.91V startup, synchronous rectification eliminating external diodes, and TSOT footprint compatibility with space-constrained portable designs.
Technical Context
The MAX1723EZK implements a forced discontinuous, current-limited pulse-frequency-modulation (PFM) control scheme with no oscillator-switching frequency varies dynamically with load. It uses an internal 0.5Ω N-channel power switch and P-channel synchronous rectifier to minimize conduction losses and eliminate external Schottky diodes.
Unlike the MAX1722/MAX1724, the MAX1723EZK lacks a BATT pin and damping switch; its low-voltage startup circuit is powered from OUT, requiring an external Schottky diode (e.g., MBR0520L) for reliable startup below 1.8V input. It includes active-low shutdown with 75mV/800mV threshold and 7nA bias current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.8V to 5.5V - supports operation down to near-dead alkaline/NiMH cells and single Li+ cells. |
| Quiescent Current | 1.5µA into OUT - enables >90% light-load efficiency in always-on sensor nodes. |
| Shutdown Current | 0.1µA into BATT - extends shelf life of battery-powered devices in storage mode. |
| Output Voltage Accuracy | ±1% - ensures stable rail for precision analog front-ends without post-regulation. |
| Max Output Current | 150mA at VOUT = 3.3V, VIN = 1.5V - sufficient for driving RF transceivers or small LCD backlights. |
| Startup Voltage | 0.91V (guaranteed at no load) - enables wake-up from deeply discharged batteries. |
| Feedback Voltage | 1.235V (typ) - sets output via resistor divider (R1/R2); leakage ≤20nA preserves accuracy. |
Pinout & Package
MAX1723EZK is housed in a 5-pin TSOT package (0.9mm typical height, RoHS-compliant), optimized for ultra-thin portable electronics. Pin assignments are validated per Maxim's official pin configuration diagram (Rev 2, p.11).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Primary return path for all internal circuits; must connect to low-impedance ground plane within 5mm of input/output capacitors. |
| OUT (Pin 2) | Power output & bootstrap supply | Delivers regulated output; also powers internal logic during startup-critical for MAX1723's OUT-powered startup circuit. |
| FB (Pin 3) | Feedback input | Senses output via resistor divider; 1.235V reference enables precise adjustable output (2V–5.5V) with minimal leakage error. |
| LX (Pin 4) | Switch node | Connects to inductor; carries high di/dt switching current-requires short, wide trace to minimize EMI and ringing. |
| SHDN (Pin 5) | Active-low shutdown control | Pulled low to enter 0.1µA shutdown; tolerates up to 6V logic-allows direct connection to microcontroller GPIO without level shift. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode-reduces BOM cost and PCB area while improving efficiency by ~5% over diode-based solutions. |
| Adjustable output voltage | 2V to 5.5V via external R1/R2 divider-enables single-footprint support for multiple system rails (e.g., 2.5V sensor, 3.3V MCU, 5V interface). |
| 0.1µA shutdown current | Extends battery shelf life beyond 10 years in low-duty-cycle IoT endpoints-critical for sealed medical or industrial telemetry devices. |
| 0.91V guaranteed startup | Enables reliable wake-up from 1x alkaline/NiMH cells at end-of-life (≤0.9V), avoiding premature device failure in field deployments. |
| TSOT-5 package | 0.9mm height, 1.6mm × 1.6mm footprint-fits in <2mm² board area, supporting wearables and ingestible sensors where volume is constrained. |
Applications
| Wireless Sensor Node | Portable Medical Monitor |
|---|---|
Use Scenario: Battery-powered temperature/humidity sensor transmitting data every 5 minutes via sub-GHz RF link. IC Role / Device Role / Timing Role: Step-up regulator generating stable 3.3V rail for MCU and RF transceiver from single 1.5V alkaline cell. Use Value: 1.5µA quiescent current minimizes standby drain; 0.91V startup ensures operation until battery reaches 0.85V, maximizing usable capacity. | Use Scenario: Handheld blood glucose meter with LCD display and USB charging circuitry. IC Role / Device Role / Timing Role: Adjustable boost converter supplying 2.8V to analog sensor front-end and 3.3V to digital controller from single AAA cell. Use Value: ±1% output accuracy maintains ADC reference stability; TSOT-5 footprint enables compact 40mm × 60mm PCB layout. |
| Remote IR Transmitter | Low-Power Data Logger |
Use Scenario: Infrared remote control for HVAC systems using two NiMH cells in series. IC Role / Device Role / Timing Role: Generates 5.0V rail for IR LED driver from 2.4V nominal input; shutdown disables output between button presses. Use Value: 0.1µA shutdown current prevents battery drain during idle; adjustable feedback allows precise 5.0V regulation despite cell voltage sag. | Use Scenario: Environmental logger recording temperature/pressure every hour and storing data to flash memory. IC Role / Device Role / Timing Role: Supplies 3.3V to microcontroller and flash memory from single Li+ cell (2.7V–4.2V range). Use Value: 0.8V–5.5V input range accommodates full Li+ discharge curve; synchronous rectification sustains >85% efficiency at 10mA load. |
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 |
|---|---|---|---|
| MAX1722EZK | Includes BATT pin and damping switch; no shutdown; fixed or adjustable output. | Better EMI performance in noise-sensitive RF environments; unsuitable where shutdown control is required. | Select MAX1722EZK when EMI suppression is critical and shutdown is unnecessary. |
| MAX1724EZK33 | Fixed 3.3V output; includes shutdown and damping switch; same TSOT-5 package. | Reduces external component count (no FB resistors); not adjustable-limits flexibility across multiple voltage requirements. | Choose MAX1724EZK33 for simplified 3.3V-only designs where bill-of-materials reduction outweighs adjustability needs. |
Compared with MAX1722EZK and MAX1724EZK33, the MAX1723EZK uniquely balances adjustability, shutdown capability, and ultra-low quiescent current-making it optimal for multi-rail, battery-constrained systems requiring both flexibility and long shelf life.
Availability
MAX1723EZK is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, and remote IR transmitters requiring stable component supply with guaranteed long-term availability.
Supply support for MAX1723EZK 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 communications applications.
The MAX1722/MAX1723/MAX1724 family was engineered specifically for ultra-low-power, single-cell battery applications demanding high light-load efficiency and minimal board area-targeting wearables, remote sensors, and portable diagnostics.
FAQ
What is the minimum input voltage required for MAX1723EZK to start up?
The MAX1723EZK guarantees startup at 0.91V under no-load conditions, as specified in the Electrical Characteristics table. However, startup voltage rises with load current-e.g., to ~1.2V at 10mA load. An external Schottky diode (e.g., MBR0520L) between LX and OUT is required for reliable startup below 1.8V input, per Maxim's Figure 3 application circuit. The MAX1723EZK's startup circuit is powered from the OUT pin, not BATT, distinguishing it from the MAX1722/MAX1724.
Does MAX1723EZK require an external Schottky diode, and if so, why?
Yes, the MAX1723EZK requires an external Schottky diode (e.g., MBR0520L) for reliable startup from input voltages below 1.8V. Unlike the MAX1722/MAX1724, the MAX1723EZK lacks a dedicated BATT pin-the startup circuit is powered from OUT, limiting initial conduction. The diode provides a low-VF path to bootstrap the IC until the output reaches ~1.5V. Once started, the internal synchronous rectifier takes over, eliminating the diode's conduction loss during normal operation. This requirement is explicitly documented in Note 2 of the datasheet.
What is the output voltage adjustment range supported by MAX1723EZK?
The MAX1723EZK supports an adjustable output voltage range of 2.0V to 5.5V, set via an external resistor divider on the FB pin. The internal 1.235V reference and ≤20nA feedback bias current enable high accuracy-using R1 = 1.24MΩ and R2 = 2.37MΩ yields 3.6V output, as shown in Figure 3. The datasheet specifies that R1 should be selected between 100kΩ and 1MΩ to minimize leakage-induced error. This adjustability allows one MAX1723EZK design to serve multiple system rails without hardware changes.
How does the shutdown function operate on MAX1723EZK, and what is its current draw?
The MAX1723EZK features an active-low SHDN pin (Pin 5) that reduces total supply current to 0.1µA when driven below 75mV (typical threshold). During shutdown, the P-channel synchronous rectifier's body diode conducts, allowing VOUT to fall to approximately VIN − 0.6V. The SHDN pin accepts logic-high voltages up to 6V regardless of BATT or OUT voltage, enabling direct interfacing with 3.3V or 5V microcontrollers. This 0.1µA shutdown current is critical for extending battery life in intermittently operating devices like remote controls or data loggers.
What package type and dimensions does MAX1723EZK use, and are there layout recommendations?
The MAX1723EZK uses a 5-pin TSOT package (outline no. 21-0113), measuring 1.6mm × 1.6mm with 0.9mm typical height. Maxim mandates strict layout rules: GND pin, input capacitor (CIN), and output capacitor (COUT) grounds must be within 5mm (0.2in) using a solid ground plane; FB and LX traces must be as short as possible to minimize noise coupling; and the LX node requires a wide, direct path to the inductor to reduce EMI. These guidelines are detailed in the "PC Board Layout Considerations" section (p.10) of the datasheet.
MAX1723EZK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.2V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 150mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
MAX1723EZK FAQ
1.How can I place an order for MAX1723EZK through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1723EZK 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 MAX1723EZK reliable?
The price and inventory of MAX1723EZK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1723EZK is usually 5 days.
3.What payment methods are accepted for MAX1723EZK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1723EZK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1723EZK?
MAX1723EZK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1723EZK 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 MAX1723EZK?
For technical support, including MAX1723EZK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1723EZK requirements.
6.How does Aetrix verify that MAX1723EZK is sourced from the original manufacturer or authorized distributors?
All MAX1723EZK 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 MAX1723EZK meets industry standards.
7.What is the process for return or replacement of MAX1723EZK?
All MAX1723EZK units undergo pre-shipment inspection (PSI). If there is an issue with MAX1723EZK, 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 MAX1723EZK part is unused and in its original packaging.
Return procedure for MAX1723EZK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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