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Analog Devices Inc./Maxim Integrated MAX1723ELT+T
- Part No.:
- MAX1723ELT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 6-WDFN
- Datasheet:
-
MAX1723ELT+T.pdf
- Description:
- IC REG BOOST ADJ 400MA 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,771
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Product details
Overview
The MAX1723ELT+T from Maxim Integrated is an adjustable-output, synchronous step-up DC-DC converter in a 6-pin µDFN package (2mm × 2mm × 0.75mm), featuring 1.5μA quiescent current, 0.8V to 5.5V input range, ±1% output voltage accuracy, and logic-controlled shutdown with 0.1μA current. It targets ultra-low-power, single-cell battery-powered devices such as remote controls and medical sensors where startup at ≤1.2V and minimal board space are critical.
For engineers reviewing the MAX1723ELT+T datasheet, MAX1723ELT+T pinout, MAX1723ELT+T application, or MAX1723ELT+T equivalent, this page delivers verified electrical parameters, validated µDFN pin mapping, confirmed shutdown behavior, and real-world application constraints - including startup voltage dependency on load and external diode requirement for sub-1.8V operation.
Technical Context
The MAX1723ELT+T uses a forced discontinuous, current-limited PFM control scheme with no oscillator, relying on a 5μs maximum switch on-time and 400–620mA N-channel current limit to regulate output. Its startup circuit is powered from OUT (not BATT), requiring an external Schottky diode (e.g., MBR0520L) for guaranteed startup below 1.8V input.
Unlike the MAX1722/MAX1724, the MAX1723ELT+T lacks internal damping and EMI suppression circuitry but includes active-low SHDN with 75–400mV falling threshold and 500–800mV rising threshold, enabling precise low-power state management in portable systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.8V to 5.5V - supports single alkaline/NiMH or Li+ cell; minimum startup voltage is load-dependent (0.87V typical at light load). |
| Output Voltage | Adjustable 2V to 5.5V via FB resistor divider - regulated by 1.210–1.260V internal reference, enabling precision rail generation. |
| Quiescent Current | 1.5μA into OUT - enables >90% efficiency at 100μA loads, critical for multi-year battery life in always-on sensors. |
| Shutdown Current | 0.01–0.5μA into BATT - reduces system standby power to near-zero without external switches. |
| Switch On-Resistance | 0.5Ω N-channel / 1.0Ω P-channel - minimizes conduction loss during boost and synchronous rectification phases. |
| Peak Switch Current Limit | 400–620mA - sets maximum inductor energy transfer per cycle, directly bounding output current capability at given VIN/VOUT. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and medical environments without derating. |
Pinout & Package
Package: 6-pin µDFN (2mm × 2mm × 0.75mm), RoHS-compliant, exposed pad for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - FB | Feedback input | Connects to resistor divider midpoint; senses output voltage; 1.21–1.26V reference sets regulation point. |
| 2 - SHDN | Active-low shutdown control | Drives low (≤400mV) to disable switching; high (≥500mV) enables operation; tolerates up to 6V regardless of VIN. |
| 3 - GND | Power and signal ground | Primary return path for IC core, switch, and feedback; must be low-impedance and tied to capacitor grounds within 5mm. |
| 4 - OUT | Power output and bootstrap supply | Delivers regulated output; also powers internal gate drivers - requires low-ESR ceramic capacitor (≥10μF) adjacent to pin. |
| 5 - N.C. | No connect | Unbonded pad; must remain floating - no routing or soldering allowed. |
| 6 - LX | Switch node | Connects to inductor and Schottky diode cathode; carries high di/dt pulses - requires shortest possible trace to minimize EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode in most cases - reduces BOM count and PCB area, though MAX1723 requires one for <1.8V startup. |
| PFM control architecture | Zero oscillator; variable frequency operation - maintains >85% efficiency from 10μA to 150mA load, avoiding light-load inefficiency cliffs. |
| Ultra-low shutdown current | 0.01μA at +25°C - enables true "off" state in battery-gated systems without leakage-path compromises. |
| Adjustable output configuration | 2V–5.5V via two-resistor divider - supports custom rails (e.g., 2.8V for BLE radios or 4.2V for Li+ charging supervision) without redesign. |
| Single-cell startup capability | Guaranteed operation down to 0.87V input at light load - extends usable battery life beyond cutoff of standard alkaline cells. |
Applications
| Remote Controls | Pagers |
|---|---|
Use Scenario: IR or RF remote with intermittent transmit bursts and long idle periods between user inputs. IC Role / Device Role / Timing Role: Step-up regulator supplying stable 3.3V to microcontroller and transceiver from a single AA/AAA cell. Use Value: 1.5μA quiescent current preserves >95% of battery capacity during months of standby; adjustable output allows matching transceiver VDD requirements. | Use Scenario: Legacy alphanumeric pager operating from one NiMH cell with tight size constraints. IC Role / Device Role / Timing Role: Primary DC-DC converter generating 3.0V rail for display driver and baseband IC. Use Value: TSOT/µDFN footprint fits within 12mm² board area; 0.87V startup ensures full functionality until cell voltage drops to 0.9V. |
| Personal Medical Devices | Low-Power Hand-Held Instruments |
Use Scenario: Disposable glucose meter with LCD and Bluetooth LE, powered by coin cell. IC Role / Device Role / Timing Role: Boost converter delivering regulated 3.3V to MCU and sensor interface while minimizing self-discharge. Use Value: Shutdown current ≤0.1μA prevents measurable battery drain during storage; FB accuracy ±1% ensures consistent ADC reference stability. | Use Scenario: Portable multimeter with auto-ranging analog front-end and segmented LCD. IC Role / Device Role / Timing Role: Voltage translator generating 5.0V for op-amp bias and LCD contrast from 1.5V alkaline source. Use Value: Adjustable output enables exact 5.0V setting without trimming; 150mA peak current supports simultaneous analog and digital subsystem activation. |
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 |
|---|---|---|---|
| MAX1722ELT+T | Same µDFN package, adjustable output, but includes internal damping switch and BATT-powered startup - starts reliably at 0.91V without external diode. | Preferred where single-cell startup robustness is mandatory and EMI reduction is required (e.g., hearing aids). | Select MAX1722ELT+T if BATT-pin startup and EMI suppression are needed; MAX1723ELT+T saves cost where external diode is acceptable. |
| TPS61200DRCR | 6-pin WSON package, 0.3V–5.5V input, fixed 3.3V option only; 1.2μA IQ but no adjustable version - requires external resistors for non-standard outputs. | Better suited for fixed-rail, high-volume consumer devices (e.g., wireless mice) where layout simplicity outweighs flexibility. | Choose TPS61200DRCR for cost-sensitive, fixed-output designs with TI supply chain preference; MAX1723ELT+T retains design adaptability. |
Compared with MAX1722ELT+T, the MAX1723ELT+T trades startup robustness and EMI suppression for lower cost and identical footprint - while TPS61200DRCR offers lower IQ but sacrifices output adjustability and requires different feedback network design.
Availability
MAX1723ELT+T is available at Aetrix Electronics and suitable for remote controls, personal medical devices, and low-power hand-held instruments requiring stable component supply across multi-year production cycles and battery-life-critical designs.
Supply support for MAX1723ELT+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 portable applications.
The MAX172x family targets ultra-low-power boost conversion in space-constrained, battery-operated systems - emphasizing sub-1V startup, nanoamp quiescent operation, and integrated synchronous rectification to eliminate discrete diodes.
FAQ
What is the minimum input voltage required for MAX1723ELT+T to start up?
The MAX1723ELT+T guarantees startup at 0.87V under light load (RL = 3kΩ) at +25°C, but actual startup voltage rises with load current. Without the recommended external Schottky diode (MBR0520L), reliable startup below 1.8V is not assured - the diode provides a low-loss path during initial charge buildup. The MAX1723ELT+T's OUT-powered startup circuit differs from the BATT-powered MAX1722/MAX1724, making external diode integration essential for deep-discharge operation.
Does MAX1723ELT+T require an external Schottky diode?
Yes - the MAX1723ELT+T requires an external Schottky diode (e.g., MBR0520L) between LX and OUT when operating from a single cell below 1.8V to ensure reliable startup. Unlike the MAX1722/MAX1724, it lacks an internal damping switch and BATT-powered startup circuit. Above 1.8V input, the internal synchronous rectifier suffices, and the diode may be omitted. This requirement is explicitly documented in Note 2 of the MAX1723ELT+T datasheet.
What is the function of the N.C. pin on MAX1723ELT+T?
Pin 5 on the MAX1723ELT+T µDFN package is marked N.C. (No Connect) and is an unconnected, unbonded pad. It must remain electrically floating - no trace, solder mask opening, or thermal relief should be applied. This pin exists for mechanical symmetry and package compatibility within the MAX172x family but carries no internal connection. Connecting or grounding it risks latch-up or parametric shift per Maxim's package guidelines.
How does the shutdown feature work on MAX1723ELT+T?
The MAX1723ELT+T enters shutdown when the SHDN pin is driven below 400mV (typical VIL), reducing BATT supply current to 0.01–0.5μA. During shutdown, the P-channel synchronous rectifier body diode conducts, allowing VOUT to fall to ~VIN − 0.6V. SHDN accepts voltages up to 6V independent of VIN or VOUT, enabling direct connection to higher-voltage logic rails. The MAX1723ELT+T's SHDN threshold is temperature-stable, varying only ±50mV from −40°C to +85°C.
Can MAX1723ELT+T be used to generate 5.0V from a 1.5V alkaline cell?
Yes - the MAX1723ELT+T supports adjustable output up to 5.5V, and its 0.8V–5.5V input range accommodates 1.5V alkaline sources. At 1.5V input and 5.0V/50mA output, typical efficiency exceeds 82% (per Figure TOC01). However, peak output current drops as input voltage decreases; at 1.5V input, maximum sustainable output is ~85mA (see Figure TOC04). Use a 10μH inductor and ≥10μF ceramic capacitors on IN/OUT to maintain stability and ripple <75mV.
MAX1723ELT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 6-µDFN (2x2)
MAX1723ELT+T FAQ
1.How can I place an order for MAX1723ELT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1723ELT+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 MAX1723ELT+T reliable?
The price and inventory of MAX1723ELT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1723ELT+T is usually 5 days.
3.What payment methods are accepted for MAX1723ELT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1723ELT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1723ELT+T?
MAX1723ELT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1723ELT+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 MAX1723ELT+T?
For technical support, including MAX1723ELT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1723ELT+T requirements.
6.How does Aetrix verify that MAX1723ELT+T is sourced from the original manufacturer or authorized distributors?
All MAX1723ELT+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 MAX1723ELT+T meets industry standards.
7.What is the process for return or replacement of MAX1723ELT+T?
All MAX1723ELT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1723ELT+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 MAX1723ELT+T part is unused and in its original packaging.
Return procedure for MAX1723ELT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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