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Analog Devices Inc./Maxim Integrated MAX1723EUK
- Part No.:
- MAX1723EUK
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX1723EUK.pdf
- Description:
- 1.5 MICRO AMP IQ, STEP-UP DC-DC
- Quantity:
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Inventory:2,249
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Product details
Overview
MAX1723EUK 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 at ±1% voltage accuracy, and features logic-controlled shutdown (0.1µA) and internal synchronous rectification-ideal for single-cell alkaline/NiMH or Li+ battery-powered remote controls and medical sensors.
For engineers reviewing the MAX1723EUK datasheet, MAX1723EUK pinout, MAX1723EUK application, or MAX1723EUK equivalent, key selection criteria include its 0.91V guaranteed startup voltage, absence of EMI suppression circuitry (vs. MAX1722/MAX1724), fixed 5-pin TSOT footprint, and requirement for external feedback resistors to set output voltage between 2V and 5.5V.
Technical Context
The MAX1723EUK implements a forced discontinuous, current-limited PFM control scheme with no oscillator-switching frequency varies dynamically with load. Its N-channel power switch has 0.5Ω on-resistance, and the synchronous rectifier uses an internal P-channel MOSFET to eliminate external diode losses.
Startup is powered from the OUT pin (not BATT), requiring ≥1.2V input without external diode assistance; with an MBR0520L Schottky diode across LX–OUT, startup drops to 0.91V. Shutdown is active-low on SHDN, reducing supply current to 0.1µA while allowing body-diode conduction from BATT to OUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Quiescent Current | 1.5µA into OUT pin-enables >90% light-load efficiency in battery-critical applications |
| Input Voltage Range | 0.8V to 5.5V-supports single-cell alkaline, NiMH, or Li+ batteries down to near-dead voltage |
| Output Current | Up to 150mA at VOUT = 3.3V-sufficient for RF transmitters and sensor biasing |
| Output Voltage Accuracy | ±1% over temperature-ensures stable reference for ADCs or low-power microcontrollers |
| Shutdown Current | 0.1µA into BATT-extends shelf life in always-on remote sensing nodes |
| Feedback Voltage | 1.235V (typ)-sets output via resistor divider; FB bias current ≤20nA minimizes divider error |
| Switch On-Resistance | 0.5Ω N-channel-reduces conduction loss at peak currents up to 500mA |
Pinout & Package
MAX1723EUK is housed in a 5-pin TSOT package (0.9mm typical height, RoHS-compliant), with exposed pad for thermal dissipation. Pin 1 is BATT (battery input/damping switch), Pin 2 is SHDN (active-low shutdown), Pin 3 is GND, Pin 4 is LX (switch node), and Pin 5 is OUT (regulated output). The FB pin is absent-output is adjustable via external resistors connected to OUT and GND per functional diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BATT (Pin 1) | Battery input and damping switch connection | Accepts 0.8V–5.5V input; powers startup circuitry-no internal damping switch (unlike MAX1722/MAX1724) |
| SHDN (Pin 2) | Active-low shutdown control | Pull low to reduce supply current to 0.1µA; tolerates up to 6V regardless of BATT/OUT voltage |
| GND (Pin 3) | Power and signal ground reference | Must be tied to low-impedance ground plane within 5mm of input/output capacitor grounds |
| LX (Pin 4) | Switch node (N-channel drain / P-channel drain) | Connects to inductor; ringing suppressed only by external snubber-no internal damping switch |
| OUT (Pin 5) | Regulated output and bootstrap supply | Delivers up to 150mA; powers internal circuitry; feedback network connects here and GND to set VOUT |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Internal P-channel MOSFET replaces external Schottky diode-reduces board area and improves efficiency by ~5% at 10mA load |
| Ultra-low quiescent current | 1.5µA supply current into OUT-enables >1-year battery life in 10µA average-load remote sensors |
| Adjustable output voltage | 2V to 5.5V via external R1/R2 divider-supports diverse rail requirements without changing IC |
| Logic-controlled shutdown | 0.1µA shutdown current into BATT-preserves battery charge during extended idle periods |
| Low-voltage startup | Guaranteed 0.91V startup with external Schottky diode-extends usable battery range below 1.0V |
Applications
| Remote Wireless Transmitters | Personal Medical Devices |
|---|---|
|
Use Scenario: Battery-powered 2.4GHz ISM-band transmitter operating from single AA cell. IC Role / Device Role / Timing Role: Step-up regulator providing stable 3.3V rail for RF IC and MCU during burst transmission. Use Value: 1.5µA quiescent current extends battery life to >2 years in low-duty-cycle telemetry; 150mA peak supports 10dBm PA drive. |
Use Scenario: Portable blood glucose meter using single alkaline AAA battery. IC Role / Device Role / Timing Role: Generates precise 3.0V analog reference and 5.0V LCD bias from declining battery voltage. Use Value: ±1% output accuracy ensures consistent ADC readings; 0.91V startup enables full functionality until battery reaches 0.95V. |
| Low-Power Hand-Held Instruments | Digital Still Cameras |
|
Use Scenario: Pocket-sized multimeter with OLED display and Bluetooth LE. IC Role / Device Role / Timing Role: Supplies 3.3V to MCU and 5.0V to display driver from single NiMH cell. Use Value: Adjustable output eliminates need for multiple fixed-voltage regulators; TSOT package saves space in <10cm² PCB layout. |
Use Scenario: Compact digital camera flash LED driver requiring 5V from single Li+ cell. IC Role / Device Role / Timing Role: Boosts battery voltage to 5.0V for high-current LED pulse operation. Use Value: 150mA output capability supports 100ms flash bursts; synchronous rectification avoids thermal derating in sealed housing. |
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+T | Includes internal damping switch and EMI suppression; no SHDN pin; fixed or adjustable output | Preferred where EMI compliance is critical (e.g., FCC Class B devices); unsuitable when shutdown control is required | Select MAX1722EZK+T if EMI reduction is mandatory and shutdown is unnecessary |
| MAX1724EZK33+T | Fixed 3.3V output; includes SHDN and damping switch; same 5-pin TSOT package | Reduces BOM count by eliminating feedback resistors; trades adjustability for simplicity in fixed-rail systems | Choose MAX1724EZK33+T when 3.3V is sufficient and layout space is constrained |
Compared with MAX1723EUK, MAX1722EZK+T offers superior EMI performance but lacks shutdown control, while MAX1724EZK33+T simplifies design with fixed output and integrated damping-making it ideal for cost-sensitive, volume-manufactured 3.3V applications where flexibility is secondary to reliability.
Availability
MAX1723EUK 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 long product lifecycles.
Supply support for MAX1723EUK 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-with emphasis on ultra-low-power and high-reliability solutions.
The MAX1722/MAX1723/MAX1724 family targets battery-constrained portable electronics, delivering high efficiency at microamp quiescent currents through proprietary PFM control and synchronous rectification architecture.
FAQ
What is the minimum input voltage required for MAX1723EUK to start up?
The MAX1723EUK guarantees startup at 0.91V when used with an external Schottky diode (e.g., MBR0520L) between LX and OUT. Without the diode, startup requires ≥1.2V input because the internal startup circuit is powered from the OUT pin-not the BATT pin like MAX1722/MAX1724. This behavior is confirmed in the datasheet's Detailed Description section and Typical Operating Characteristics (Figure toc05).
Does MAX1723EUK include internal EMI suppression circuitry?
No, MAX1723EUK does not include internal EMI suppression. Unlike MAX1722 and MAX1724, which feature a built-in damping switch to suppress inductor ringing at the LX node, MAX1723EUK relies on external snubbers or layout optimization for EMI control. This distinction is explicitly stated in the Features list and Selector Guide table in the datasheet.
How is the output voltage set on MAX1723EUK?
The output voltage of MAX1723EUK is set externally using a resistor divider between OUT and GND, connecting to the FB node-which is internally accessible but not brought out to a dedicated pin. The feedback voltage is 1.235V (typ), so R1 and R2 are calculated using VOUT = 1.235 × (1 + R1/R2). Resistor values should be selected between 100kΩ and 1MΩ to minimize leakage error, as specified in the Design Procedure section.
What is the maximum continuous output current of MAX1723EUK?
MAX1723EUK delivers up to 150mA continuous output current when configured for 3.3V output with 1.5V input and 10µH inductor, as shown in the Typical Operating Characteristics plot "Maximum Output Current vs. Input Voltage" (toc04). Actual current depends on input voltage, output voltage, inductor value, and ambient temperature-peak switch current is limited to 500mA, but thermal limits constrain sustained delivery.
Is MAX1723EUK pin-compatible with other devices in the MAX1722/MAX1723/MAX1724 family?
Yes, MAX1723EUK shares the identical 5-pin TSOT package and pinout with MAX1722 and MAX1724 variants-BATT, SHDN, GND, LX, and OUT occupy the same positions. However, functional differences exist: MAX1723EUK lacks the internal damping switch and EMI clamp of MAX1722/MAX1724, and its startup circuit is OUT-powered rather than BATT-powered. These require schematic review but no PCB layout change.
MAX1723EUK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX1723EUK FAQ
1.How can I place an order for MAX1723EUK through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1723EUK 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 MAX1723EUK reliable?
The price and inventory of MAX1723EUK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1723EUK is usually 5 days.
3.What payment methods are accepted for MAX1723EUK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1723EUK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1723EUK?
MAX1723EUK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1723EUK 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 MAX1723EUK?
For technical support, including MAX1723EUK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1723EUK requirements.
6.How does Aetrix verify that MAX1723EUK is sourced from the original manufacturer or authorized distributors?
All MAX1723EUK 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 MAX1723EUK meets industry standards.
7.What is the process for return or replacement of MAX1723EUK?
All MAX1723EUK units undergo pre-shipment inspection (PSI). If there is an issue with MAX1723EUK, 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 MAX1723EUK part is unused and in its original packaging.
Return procedure for MAX1723EUK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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