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Analog Devices Inc./Maxim Integrated MAX1724EZK33
- Part No.:
- MAX1724EZK33
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MAX1724EZK33.pdf
- Description:
- IC REG BOOST 3.3V 400MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,993
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Product details
Overview
The MAX1724EZK33 from Maxim Integrated is a fixed-output 3.3V, high-efficiency step-up DC-DC converter in a 5-pin TSOT package, featuring 1.5μA quiescent current, 0.91V guaranteed startup voltage, ±1% output voltage accuracy, and integrated synchronous rectification for single-cell alkaline/NiMH or Li+ battery-powered systems.
For engineers reviewing the MAX1724EZK33 datasheet, MAX1724EZK33 pinout, MAX1724EZK33 application, or MAX1724EZK33 equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives, and supply-ready availability details - all specific to the MAX1724EZK33 variant with 3.3V fixed output and TSOT packaging.
Technical Context
The MAX1724EZK33 implements a forced discontinuous, current-limited PFM control scheme with no oscillator, relying on 5μs maximum switch on-time and 500mA N-channel current limit to regulate output. Its low-voltage startup circuit is powered from the BATT pin, enabling reliable operation down to 0.91V input at +25°C.
It integrates an internal damping switch to suppress LX node ringing and reduce EMI, and uses a P-channel synchronous rectifier to eliminate external diode requirements. Shutdown is active-low via SHDN pin, reducing supply current to 0.01μA at +25°C while allowing battery-to-output body-diode conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1% over -40°C to +85°C - ensures stable rail for microcontrollers and sensors without external feedback resistors. |
| Input Voltage Range | 0.8V to 5.5V - supports single-cell alkaline (0.8–1.6V), NiMH (0.8–1.4V), or Li+ (2.7–4.2V) sources without external regulation. |
| Quiescent Current | 1.5μA into OUT - enables >1-year battery life in ultra-low-power remote controls and medical sensors at light load. |
| Shutdown Current | 0.01μA into BATT at +25°C - preserves battery charge during extended standby in portable instrumentation. |
| Startup Voltage | 0.91V minimum at +25°C with no load - guarantees boot-up from nearly depleted alkaline cells before system reset. |
| Max Output Current | 150mA at VIN = 1.5V, VOUT = 3.3V - sufficient to power RF transceivers or LCD backlights in compact handheld devices. |
| Package | 5-pin TSOT (0.9mm height, 1.6mm × 1.6mm footprint) - enables PCB area savings in space-constrained wearables and IoT endpoints. |
Pinout & Package
MAX1724EZK33 is housed in a 5-pin Thin SOT (TSOT) package with 0.65mm pitch, 1.6mm × 1.6mm body, and 0.9mm typical height. Pin 1 is marked by a dot or beveled edge; pin numbering follows standard TSOT top-view convention (counterclockwise from mark).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BATT | Battery input and damping switch connection | Primary power source input; powers low-voltage startup circuit and enables EMI suppression via internal damping switch. |
| SHDN | Active-low shutdown control | Drives low (≤75mV) to enter 0.01μA shutdown; tolerates up to 6V regardless of BATT/OUT voltage - simplifies host MCU interface. |
| GND | Power and signal reference ground | Common return path for switching current and feedback; must connect to low-impedance ground plane within 5mm of CIN/COUT. |
| OUT | Regulated power output and bootstrap supply | Delivers 3.3V to load; also supplies internal bias voltage - requires ≥10μF ceramic capacitor for stability and ripple control. |
| LX | Switch node (N-MOSFET drain / P-MOSFET drain) | Connects to inductor; carries high di/dt switching current - demands shortest possible trace to minimize EMI and voltage spikes. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated P-channel MOSFET eliminates external Schottky diode - reduces BOM count, board area, and conduction losses by ~0.3V drop. |
| EMI suppression | Internal damping switch clamps LX ringing - lowers radiated emissions without adding components or degrading efficiency. |
| Ultra-low IQ operation | 1.5μA quiescent current into OUT - extends battery life in always-on remote sensors where average load is <100μA. |
| Single-cell startup | 0.91V guaranteed start at +25°C - enables use with aging alkaline batteries down to 0.9V, avoiding premature device shutdown. |
| Fixed 3.3V output | No external feedback resistors required - simplifies layout, improves production yield, and eliminates resistor tolerance drift impact on VOUT. |
Applications
| Remote Wireless Transmitters | Pagers |
|---|---|
Use Scenario: Battery-powered sub-GHz ISM band transmitters sending periodic sensor telemetry in industrial monitoring networks. IC Role / Device Role / Timing Role: Step-up regulator supplying stable 3.3V to RF IC and microcontroller from a single AA alkaline cell. Use Value: 0.91V startup and 1.5μA IQ enable >2-year battery life and reliable transmission even as cell voltage drops below 1.0V. |
Use Scenario: Legacy two-way pagers operating on 1.5V alkaline cells with intermittent display and alert activation. IC Role / Device Role / Timing Role: Primary 3.3V power source for LCD driver and baseband processor during message decode and alert bursts. Use Value: Fixed 3.3V output eliminates calibration overhead; TSOT package fits tight pager form factor while sustaining 150mA peak loads. |
| Personal Medical Devices | Low-Power Hand-Held Instruments |
Use Scenario: Portable blood glucose meters requiring accurate analog measurements and Bluetooth LE connectivity from coin-cell or AAA batteries. IC Role / Device Role / Timing Role: Supplies clean, regulated 3.3V to ADC reference, op-amps, and BLE SoC during measurement and wireless upload phases. Use Value: ±1% output accuracy ensures consistent ADC full-scale range; low EMI supports noise-sensitive analog front-end performance. |
Use Scenario: Pocket-sized multimeters and thermal imagers powered by two AAA cells, with LCD backlight and precision measurement circuits. IC Role / Device Role / Timing Role: Generates 3.3V rail for microcontroller, display controller, and analog signal chain from variable 1.8–3.0V input. Use Value: 0.8V–5.5V input range accommodates full battery discharge curve; synchronous rectification maintains >85% efficiency at 50mA 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 |
|---|---|---|---|
| MAX1724ELT33 | Same 3.3V fixed output, but in 6-pin µDFN (2mm × 2mm × 0.75mm); includes NC pin; identical electrical specs. | Requires different PCB footprint and reflow profile; better thermal dissipation but larger area than TSOT. | Select MAX1724ELT33 only when higher power handling or improved thermal margin justifies larger package size. |
| TPS61200DRCT | 3.3V fixed output, 1.8V–5.5V input, 1.2μA IQ, but no internal damping switch; uses external diode in some configurations. | Lacks integrated EMI suppression; may require additional filtering in noise-sensitive RF applications. | Choose TPS61200DRCT if lower IQ is critical and EMI is managed externally; verify LX ringing behavior in final layout. |
Compared with MAX1724EZK33, MAX1724ELT33 offers identical regulation but trades TSOT compactness for µDFN thermal capability, while TPS61200DRCT achieves slightly lower IQ but lacks the integrated damping switch critical for clean RF coexistence.
Availability
MAX1724EZK33 is available at Aetrix Electronics and suitable for remote wireless transmitters, personal medical devices, and low-power hand-held instruments requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1724EZK33 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 demanding industrial, medical, and consumer applications.
The MAX1722/MAX1723/MAX1724 family was engineered specifically for ultra-low-power, single-cell battery systems where minimal quiescent current, small footprint, and reliable low-voltage startup are non-negotiable.
FAQ
What is the guaranteed minimum startup voltage for MAX1724EZK33?
The MAX1724EZK33 guarantees startup at 0.91V input voltage at +25°C with no load, per the datasheet's Electrical Characteristics table. This value increases slightly with temperature and load - e.g., 0.95V at +85°C - but remains functional down to 0.8V input across the full -40°C to +85°C operating range. The MAX1724EZK33 achieves this via a dedicated BATT-powered startup circuit not present in the MAX1723 variant.
Does MAX1724EZK33 require external feedback resistors to set its output voltage?
No, the MAX1724EZK33 does not require external feedback resistors. It is a fixed-output variant delivering 3.3V ±1% over temperature and line, with internal feedback network trimmed at wafer test. Unlike the adjustable MAX1722/MAX1723, the MAX1724EZK33 connects FB internally to the 1.235V reference, eliminating resistor selection, placement, and tolerance errors - a key advantage for high-volume, space-constrained designs.
What is the maximum continuous output current supported by MAX1724EZK33 at 3.3V output?
The MAX1724EZK33 supports up to 150mA continuous output current when stepping up from 1.5V input to 3.3V output, as specified in the Typical Operating Characteristics graphs and confirmed in the Selector Guide. At lower input voltages (e.g., 1.2V), max output current drops to ~100mA due to reduced energy transfer per switching cycle; at higher inputs (e.g., 2.5V), it can sustain 150mA with >85% efficiency.
How does the internal damping switch in MAX1724EZK33 reduce EMI?
The MAX1724EZK33's internal damping switch activates during inductor flyback when stored energy is insufficient to sustain output current, providing a controlled path to dissipate resonant ringing at the LX node. This suppresses high-frequency voltage spikes (typically 50–200MHz) that cause radiated EMI, without affecting output ripple or efficiency - a feature absent in the MAX1723 and critical for passing FCC/CE emissions tests in compact RF modules.
Is MAX1724EZK33 pin-compatible with other devices in the MAX1722/MAX1723/MAX1724 family?
Yes, the MAX1724EZK33 shares identical 5-pin TSOT pinout with MAX1722EZK and MAX1723EZK - BATT, SHDN, GND, OUT, LX in the same order. However, functional compatibility requires verification: MAX1722 lacks SHDN, MAX1723 lacks BATT damping, and only MAX1724 variants include both features plus fixed output. Swapping requires confirming system-level requirements for shutdown control and EMI suppression.
MAX1724EZK33 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:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- 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
MAX1724EZK33 FAQ
1.How can I place an order for MAX1724EZK33 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1724EZK33 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 MAX1724EZK33 reliable?
The price and inventory of MAX1724EZK33 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1724EZK33 is usually 5 days.
3.What payment methods are accepted for MAX1724EZK33?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1724EZK33 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1724EZK33?
MAX1724EZK33 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1724EZK33 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 MAX1724EZK33?
For technical support, including MAX1724EZK33 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1724EZK33 requirements.
6.How does Aetrix verify that MAX1724EZK33 is sourced from the original manufacturer or authorized distributors?
All MAX1724EZK33 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 MAX1724EZK33 meets industry standards.
7.What is the process for return or replacement of MAX1724EZK33?
All MAX1724EZK33 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1724EZK33, 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 MAX1724EZK33 part is unused and in its original packaging.
Return procedure for MAX1724EZK33:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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