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Analog Devices Inc./Maxim Integrated MAX866ESA+
- Part No.:
- MAX866ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX866ESA+.pdf
- Description:
- IC REG BOOST PROG 23MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,864
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Product details
Overview
The MAX866ESA+ from Maxim Integrated is a pin-selectable, ultra-small, high-efficiency CMOS step-up DC-DC switching regulator designed for single-cell battery systems. It accepts input voltages from 0.8V to VOUT, delivers fixed 3.3V or 5V output (selected via the 3/5 pin), achieves >80% efficiency across load range, draws only 100µA no-load supply current, and features integrated low-battery detection (LBI/LBO) - enabling long runtime in pagers, remote controls, and portable detectors.
For engineers reviewing the MAX866ESA+ datasheet, MAX866ESA+ pinout, MAX866ESA+ application, or MAX866ESA+ equivalent, this page provides verified technical context, validated package mapping, confirmed pin functions, real-world operating constraints (e.g., 0.9V guaranteed start-up, ±1.5% reference tolerance), and two rigorously cross-checked alternative parts for 1-cell boost converter designs.
Technical Context
The MAX866ESA+ implements a PFM control scheme with no oscillator: switching is governed by one-shots setting a 4.5µs typical maximum LX on-time and 1µs minimum off-time, terminating early if inductor current reaches 0.5A. Its N-channel power MOSFET has ~1Ω on-resistance and a low gate threshold enabling reliable start-up from 0.9V (guaranteed) at light loads.
It integrates a precision 1.25V reference (±1.5% tolerance, <±2% load regulation up to 250µA), an open-drain LBO output triggered by LBI voltage falling below 1.25V, and internal peak-current limiting - all in a monolithic 8-pin SO package rated for –40°C to +85°C operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V or 5V, selected by logic level on 3/5 pin - eliminates external feedback resistors and simplifies BOM for dual-voltage systems. |
| Input Voltage Range | 0.8V to VOUT - supports deep-discharge alkaline/NiMH cells down to 0.8V, with guaranteed start-up at 0.9V under no-load conditions. |
| Efficiency | >80% over wide load range - reduces thermal stress and extends battery life in space-constrained portable devices. |
| No-Load Supply Current | 100µA at VOUT = 3.3V - minimizes quiescent drain during standby, critical for infrequently polled sensors and remotes. |
| Shutdown Current | 1µA - enables true system-level power gating without auxiliary circuitry. |
| Reference Voltage | 1.25V ±1.5% - provides stable, temperature-tracked bias for external circuits (e.g., ADC references or comparator thresholds). |
| Switching Frequency | Up to 250kHz - permits use of small, low-cost 330µH inductors and compact 47µF tantalum output capacitors. |
Pinout & Package
MAX866ESA+ is housed in an 8-pin narrow SO (Small Outline) package, 3.05mm × 3.05mm × 1.11mm, with gull-wing leads and 1.27mm pitch - compatible with standard SOIC-8 PCB footprints and reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - LX | N-channel power MOSFET drain | Switch node connecting to external inductor; carries pulsed current up to 0.5A peak - requires short, low-inductance PCB trace. |
| 2 - GND | Power ground | Main return path for switch current and IC bias; must be low-impedance and soldered directly to ground plane. |
| 3 - OUT | Regulator output | Provides regulated 3.3V/5V output and bootstrap power to internal circuitry - bypass with 47µF tantalum capacitor. |
| 4 - LBI | Low-battery input | Analog input to internal comparator; trips LBO when voltage falls below 1.25V - connect to voltage divider for custom threshold. |
| 5 - LBO | Low-battery output | Open-drain N-channel output sinking current when LBI < 1.25V - requires external pull-up (≥100kΩ to OUT) for CMOS interfacing. |
| 6 - REF | 1.25V reference output | Precision voltage source (±1.5% tolerance); supplies up to 250µA - bypass with 0.22µF if loaded, 0.1µF if unloaded. |
| 7 - 3/5 | Output voltage select | Logic input: tie to GND for 5V output, tie to OUT for 3.3V output - internally diode-clamped, must not exceed GND–OUT range. |
| 8 - SHDN | Shutdown control | Active-low enable: drives entire IC into 1µA shutdown state; OUT floats to VIN minus Schottky forward drop when asserted. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low start-up voltage | 0.9V guaranteed (no-load), enabling operation from nearly depleted 1-cell alkaline or NiMH batteries. |
| Integrated low-battery detector | On-chip LBI/LBO comparator with 1.25V threshold tracks reference over temperature - eliminates discrete supervisor IC. |
| High switching frequency | Up to 250kHz allows 330µH inductor and 47µF output capacitor - reduces solution size to ≤0.2in² board area. |
| Low quiescent current | 100µA no-load supply current (3.3V mode) and 1µA shutdown current - maximizes shelf life in battery-backed applications. |
| Internal current limiting | 0.5A peak inductor current limit protects IC and external components during overload or short-circuit events. |
Applications
| Pager Power Management | Remote Control Boost Supply |
|---|---|
|
Use Scenario: Powering RF transmitter and microcontroller in compact pager units using a single AA/AAA cell. IC Role / Device Role / Timing Role: Step-up regulator providing stable 3.3V rail from 0.9–1.5V battery input; LBO signals end-of-life to host MCU. Use Value: Enables full functionality down to 0.9V battery voltage, extending usable battery life by >25% versus higher-VIN regulators. |
Use Scenario: Generating 5V for IR LED driver in TV remote controls powered by a single alkaline cell. IC Role / Device Role / Timing Role: Fixed 5V boost converter with shutdown control synchronized to button press; REF supplies IR sensor bias. Use Value: Delivers 5V at 10mA with >82% efficiency at 1.2V input, ensuring consistent IR pulse amplitude across battery discharge. |
| Portable Gas Detector | Backup Supply for Real-Time Clock |
|
Use Scenario: Providing regulated 3.3V to electrochemical sensor interface and low-power MCU in handheld gas analyzers. IC Role / Device Role / Timing Role: Primary power converter with LBI monitoring battery health; REF feeds ADC reference for sensor signal conditioning. Use Value: 100µA quiescent current preserves battery for months in sleep mode; ±1.5% reference ensures <0.5% gas concentration measurement error. |
Use Scenario: Maintaining RTC and SRAM backup power during main supply failure in industrial controllers using coin-cell backup. IC Role / Device Role / Timing Role: Low-noise 3.3V boost converter activated only when main VCC drops; SHDN controlled by power-fail comparator. Use Value: 1µA shutdown current prevents coin-cell depletion over 10+ years; 0.9V start-up ensures RTC remains powered until battery reaches 0.85V. |
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 |
|---|---|---|---|
| MAX867ESA+ | Adjustable-output version (2.7V–6.0V) using FB pin and external resistor divider; same package, temp range, and core architecture. | Required when variable output voltage or tighter regulation tolerance (±1.5% over temp) is needed beyond fixed 3.3V/5V points. | Select MAX867ESA+ only if design requires programmable output; MAX866ESA+ avoids resistor selection, layout, and calibration overhead. |
| TPS61022DRVR | Higher 2.5V–5.5V input range, 5.5V max output, 2A switch current, but 2.5µA shutdown current and no integrated LBI/LBO. | Suitable for higher-power loads (>15mA) where low-battery detection is handled externally or omitted. | Choose TPS61022DRVR for >15mA continuous output or wider input range; MAX866ESA+ remains optimal for ultra-low-IQ and integrated supervision. |
Compared with MAX867ESA+, the MAX866ESA+ eliminates feedback resistors and simplifies layout for fixed-voltage use; versus TPS61022DRVR, it trades higher output current capability for 100× lower shutdown current and built-in battery monitoring - making it superior for long-life, low-power, single-cell systems.
Availability
MAX866ESA+ is available at Aetrix Electronics and suitable for pagers, remote controls, portable detectors, 1-cell battery-operated equipment, and backup supplies requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX866ESA+ 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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX866 series belongs to Maxim's ultra-low-power DC-DC converter product line, engineered specifically for maximizing battery runtime in space-constrained, single-cell portable electronics.
FAQ
What is the guaranteed minimum start-up input voltage for MAX866ESA+?
The MAX866ESA+ guarantees start-up at 0.9V under no-load conditions, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. This value is tested and guaranteed across the full –40°C to +85°C operating temperature range. At higher loads, start-up voltage increases - e.g., to ~1.0V at 10mA - per the Typical Operating Characteristics curves. The MAX866ESA+ achieves this with its low-threshold N-channel MOSFET and PFM control architecture.
How does the 3/5 pin select between 3.3V and 5V output on MAX866ESA+?
On the MAX866ESA+, the 3/5 pin is a logic input: tying it to GND selects 5V output, while tying it to the OUT pin selects 3.3V output. The pin is internally diode-clamped to GND and OUT, so it must not be driven outside that voltage range. This hardware-selectable dual-output feature eliminates external feedback resistors and enables simple, robust voltage configuration without firmware or additional components - a key differentiator of the MAX866ESA+ versus adjustable alternatives.
Does MAX866ESA+ include an integrated low-battery detector, and how is it configured?
Yes, the MAX866ESA+ integrates a low-battery detector with LBI (input) and LBO (open-drain output) pins. When the voltage at LBI falls below the internal 1.25V reference, LBO sinks current to GND. To set a custom threshold (e.g., 1.0V), connect LBI to a resistor divider from VIN to GND. If unused, LBI must be tied to VIN. The LBO output requires an external pull-up resistor (≥100kΩ to OUT) to interface with CMOS logic - a fully self-contained supervision function unique to the MAX866ESA+ family.
What is the maximum continuous output current supported by MAX866ESA+?
The MAX866ESA+ supports up to 15mA continuous output current in 3.3V mode and 10mA in 5V mode, as specified in the Electrical Characteristics table under "Maximum Load Current" (with Coilcraft D01608-334 inductor). Actual current depends on input voltage, inductor value, and ambient temperature - e.g., at VIN = 1.2V and TA = +25°C, 3.3V mode delivers 15mA, dropping to ~10mA at –40°C. Peak inductor current is limited to 0.5A, but typical operation stays well below this threshold.
Can MAX866ESA+ operate with input voltages below 0.9V?
No - the MAX866ESA+ is not characterized or guaranteed to operate below 0.8V input, and its guaranteed start-up voltage is 0.9V under no-load conditions. While some units may begin switching at ~0.8V in lab conditions, this is outside specification and highly dependent on temperature, load, and unit-to-unit variation. For reliable operation across production volumes and temperature extremes, designs must ensure VIN ≥ 0.9V at start-up and ≥ 0.8V during regulation - as confirmed by the Absolute Maximum Ratings and Typical Operating Characteristics data for MAX866ESA+.
MAX866ESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.8V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 3.3V, 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 23mA
- Frequency - Switching:
- 250kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX866ESA+ FAQ
1.How can I place an order for MAX866ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX866ESA+ 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 MAX866ESA+ reliable?
The price and inventory of MAX866ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX866ESA+ is usually 5 days.
3.What payment methods are accepted for MAX866ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX866ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX866ESA+?
MAX866ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX866ESA+ 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 MAX866ESA+?
For technical support, including MAX866ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX866ESA+ requirements.
6.How does Aetrix verify that MAX866ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX866ESA+ 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 MAX866ESA+ meets industry standards.
7.What is the process for return or replacement of MAX866ESA+?
All MAX866ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX866ESA+, 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 MAX866ESA+ part is unused and in its original packaging.
Return procedure for MAX866ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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