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Analog Devices Inc./Maxim Integrated MAX1678EUA+T
- Part No.:
- MAX1678EUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1678EUA+T.pdf
- Description:
- IC REG BST ADJ/2V 550MA 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,035
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Product details
Overview
MAX1678EUA+T from Maxim Integrated is a synchronous-rectified, pulse-frequency-modulated (PFM) step-up DC-DC converter optimized for single-cell alkaline/NiMH/Li-ion and two-cell battery systems. It guarantees 0.87V start-up, delivers up to 90% efficiency at 20mA load, integrates a 1Ω N-channel MOSFET switch and synchronous rectifier, and supports dual-mode output: fixed 3.3V or adjustable 2V–5.5V via external resistors - used in pagers, remote controls, and personal medical monitors.
For engineers reviewing the MAX1678EUA+T datasheet, MAX1678EUA+T pinout, MAX1678EUA+T application, or MAX1678EUA+T equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters across temperature, real-world efficiency curves, and authoritative alternative selection guidance for low-power battery-powered designs.
Technical Context
The MAX1678EUA+T employs a constant-peak-current PFM control scheme with input-voltage-dependent on-time (tON = K/VBATT, K = 8 V·µs typical), enabling ultra-low quiescent current (37 µA into BATT at +25°C) while maintaining high efficiency across wide load ranges. Its internal architecture includes a bootstrapped power path, zero-crossing detection for synchronous rectifier timing, and an integrated damping switch that suppresses LX-node ringing by connecting LX to BATT during dead time.
It features a dedicated power-fail comparator (PFI threshold = 614 mV, 2% hysteresis) driving an open-drain PFO output, independent logic-controlled shutdown (2 µA shutdown current), and built-in reverse-battery protection limiting reverse current to 220 mA. The device operates from −40°C to +85°C and uses a proprietary start-up oscillator to bootstrap operation from as low as 0.87V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Start-Up Voltage | 0.87V minimum - enables reliable power-up from nearly-dead single-cell batteries without external assistance. |
| Quiescent Current (BATT) | 37 µA typical at +25°C - extends shelf life and sleep-mode runtime in intermittently active devices. |
| Efficiency | Up to 90% at 20mA load (VIN = 1.5V → 3.3V) - minimizes thermal stress and maximizes usable battery energy. |
| Output Modes | Fixed 3.3V (FB = GND) or adjustable 2V–5.5V (FB = resistor divider) - supports diverse system voltage requirements with no additional ICs. |
| Shutdown Current | 2 µA into BATT - ensures near-zero drain during system standby, critical for long-life battery applications. |
| Power-Fail Detection | PFI trip = 614 mV ±10 mV, 2% hysteresis - provides accurate, noise-immune low-battery warning with minimal external components. |
| Package | 8-pin µMAX (3mm × 3mm × 1.1mm) - ultra-compact footprint ideal for space-constrained portable electronics. |
Pinout & Package
MAX1678EUA+T is housed in an 8-pin µMAX package (3.0mm × 3.0mm × 1.1mm height), specified for −40°C to +85°C operation. Pin 1 is marked with a dot; top-view pin numbering follows standard µMAX orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BATT (Pin 1) | Battery power input | Main supply input; powers start-up oscillator and internal circuitry before bootstrapping; reverse-battery protected. |
| PFI (Pin 2) | Power-fail input | Analog input to on-chip comparator; triggers PFO when voltage falls below 614 mV; 10 nA max leakage preserves accuracy. |
| PFO (Pin 3) | Power-fail open-drain output | Sinks current when PFI < 614 mV; requires external pull-up; used for MCU reset or low-battery interrupt signaling. |
| SHDN (Pin 4) | Logic-controlled shutdown input | Active-low enable; pulls low to enter 2 µA shutdown mode; connect to BATT or OUT to disable shutdown. |
| FB (Pin 5) | Feedback input | Regulates to 1.23 V; connects to GND for fixed 3.3V mode or resistor divider for 2V–5.5V adjustable output. |
| GND (Pin 6) | Ground reference | Primary return path for power and signal; must be star-connected near OUT and LX for stable regulation. |
| LX (Pin 7) | Switch node | Drain of internal N-MOSFET and P-MOSFET synchronous rectifier; high di/dt node requiring short, low-inductance layout. |
| OUT (Pin 8) | Power output / bootstrapped supply | Regulated output and internal supply rail post-startup; bypass capacitor must be placed ≤5 mm from pin per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated P-channel MOSFET replaces external Schottky diode - eliminates forward-drop loss and improves light-load efficiency. |
| Inductor damping switch | Internal switch connects LX to BATT during dead time - suppresses LC ringing and reduces EMI without affecting output ripple. |
| Dual-mode output configuration | Single-pin FB selection between fixed 3.3V and resistor-programmable 2V–5.5V - simplifies BOM and design reuse across product variants. |
| Ultra-low start-up voltage | 0.87V guaranteed - enables operation from weak primary cells where competing converters fail to initiate. |
| Reverse-battery protection | Internal 5Ω series resistor limits reverse current to ≤220 mA - prevents damage during accidental battery insertion reversal. |
Applications
| Pagers | Remote Controls |
|---|---|
Use Scenario: Compact handheld paging units powered by single AA/AAA alkaline cells with intermittent display and alert activation. IC Role / Device Role / Timing Role: Step-up regulator supplying stable 3.3V to microcontroller and RF transceiver from decaying 0.9–1.5V battery input. Use Value: 0.87V start-up ensures full battery utilization; 37 µA quiescent current extends months-long standby life. |
Use Scenario: IR remote controls using one or two alkaline cells, requiring burst-mode 3.3V for MCU and IR LED driver. IC Role / Device Role / Timing Role: PFM-controlled boost converter delivering regulated 3.3V only during button-press events; enters 2 µA shutdown between presses. Use Value: 90% efficiency at 20mA peak load minimizes battery drain per transmission; µMAX package fits narrow PCB form factor. |
| Personal Medical Monitors | Single-Cell Battery-Powered Devices |
Use Scenario: Portable blood glucose meters or pulse oximeters powered by CR2032 coin cell or AAA battery. IC Role / Device Role / Timing Role: Primary power source converting 2.0–3.0V coin cell or 0.85–1.5V alkaline output to precise 3.3V for ADC, LCD, and Bluetooth LE radio. Use Value: Built-in PFI/PFO enables accurate low-battery warning before measurement failure; 1.1mm height allows thin device profiles. |
Use Scenario: Low-power IoT sensors (temperature, humidity) operating on single alkaline or Li-ion cells with multi-year battery life targets. IC Role / Device Role / Timing Role: Always-on boost regulator powering MCU in deep-sleep (nA) and wake-up (mA) cycles; regulates output despite wide input voltage swing. Use Value: 2 µA shutdown and 37 µA quiescent current directly determine years-long operational lifetime; adjustable output supports varied sensor supply needs. |
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 |
|---|---|---|---|
| TPS61022DRVR | Higher 500mA peak switch current; 2.5V–5.5V input range; no integrated PFI/PFO comparator. | Requires external power-fail circuitry; better suited for higher-current loads (>50mA) but less integrated for low-battery monitoring. | Select when >50mA continuous output or wider input range is required; avoid if PFI/PFO integration is critical. |
| SP6650ES-L/TR | Fixed 3.3V only; 1.8V–5.5V input; 300mA peak current; no shutdown or PFI/PFO; larger SOT-23-6 package. | Lacks programmability, monitoring, and ultra-low shutdown current; simpler but functionally limited. | Select for cost-sensitive, fixed-output applications where size and feature count are secondary to unit price. |
Compared with TPS61022DRVR and SP6650ES-L/TR, MAX1678EUA+T uniquely combines guaranteed 0.87V start-up, integrated PFI/PFO, 2 µA shutdown, and µMAX packaging - making it optimal for space-constrained, battery-life-critical, single-cell systems requiring autonomous low-voltage management.
Availability
MAX1678EUA+T is available at Aetrix Electronics and suitable for pagers, remote controls, personal medical monitors, and single-cell battery-powered devices requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance over −40°C to +85°C.
Supply support for MAX1678EUA+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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and consumer applications.
The MAX1678EUA+T belongs to Maxim's low-power, battery-optimized DC-DC converter family, designed specifically for ultra-low-voltage start-up and extended runtime in portable electronics powered by primary or single-cell lithium batteries.
FAQ
What is the minimum input voltage required for MAX1678EUA+T to start switching?
The MAX1678EUA+T guarantees start-up from 0.87V under defined conditions, verified across process and temperature. This is achieved via an internal low-voltage start-up oscillator that pumps the output to ~1.7V before enabling main regulation. Actual start-up voltage varies slightly with load and inductor value - see Figure 15 in the datasheet for load-dependent curves. MAX1678EUA+T remains operational even as input drops below 0.87V after startup.
Can MAX1678EUA+T operate in adjustable output mode, and what is the supported voltage range?
Yes, MAX1678EUA+T supports adjustable output mode by connecting the FB pin to a resistor divider between OUT and GND. The output voltage is set by VOUT = 1.23V × (1 + R1/R2), covering 2.0V to 5.5V. The FB pin regulates precisely to 1.23V (±15 mV), and FB input current is ≤10 nA, ensuring minimal error from resistor-divider loading. MAX1678EUA+T maintains regulation stability across this full range with appropriate inductor and capacitor selection.
How does the PFI/PFO function work on MAX1678EUA+T, and what are its thresholds?
The PFI input monitors input voltage via an internal comparator with a 614 mV threshold (±10 mV) and 2% hysteresis. When PFI falls below this level, the open-drain PFO output sinks current to GND, signaling power failure to an external MCU or supervisor. Threshold setting uses external resistors R3 and R4 per R3 = R4 × (VTH/0.614 − 1). MAX1678EUA+T's PFI leakage is ≤10 nA, preserving accuracy with high-value feedback resistors (100 kΩ to 1 MΩ).
What is the purpose of the damping switch in MAX1678EUA+T, and how does it affect EMI?
The damping switch in MAX1678EUA+T connects the LX node to BATT during dead time to dissipate residual inductor energy, suppressing LC ringing at the switch node. This reduces high-frequency EMI emissions without altering output voltage ripple. Waveform comparisons (Figures 5 and 6) confirm significant ringing suppression. MAX1678EUA+T's damping switch is fully internal - no external components or layout changes are needed to benefit.
Does MAX1678EUA+T include reverse-battery protection, and what is its limit?
Yes, MAX1678EUA+T includes integrated reverse-battery protection via an internal 5Ω resistor in series with a diode, limiting reverse current to ≤220 mA. This protects the IC during accidental battery reversal and stays within package power-dissipation limits. Prolonged exposure (>10 minutes) above 220 mA may degrade performance. MAX1678EUA+T continues normal operation with correct polarity and requires no external protection components.
MAX1678EUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2V (3.3V)
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 550mA (Switch)
- Frequency - Switching:
- 150kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX1678EUA+T FAQ
1.How can I place an order for MAX1678EUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1678EUA+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 MAX1678EUA+T reliable?
The price and inventory of MAX1678EUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1678EUA+T is usually 5 days.
3.What payment methods are accepted for MAX1678EUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1678EUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1678EUA+T?
MAX1678EUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1678EUA+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 MAX1678EUA+T?
For technical support, including MAX1678EUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1678EUA+T requirements.
6.How does Aetrix verify that MAX1678EUA+T is sourced from the original manufacturer or authorized distributors?
All MAX1678EUA+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 MAX1678EUA+T meets industry standards.
7.What is the process for return or replacement of MAX1678EUA+T?
All MAX1678EUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1678EUA+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 MAX1678EUA+T part is unused and in its original packaging.
Return procedure for MAX1678EUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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