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Analog Devices Inc./Maxim Integrated MAX867ESA+
- Part No.:
- MAX867ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX867ESA+.pdf
- Description:
- IC REG BOOST ADJ 15MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,254
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Product details
Overview
The MAX867ESA+ from Maxim Integrated is an adjustable-output, ultra-small CMOS step-up DC-DC switching regulator optimized for single-cell battery systems. It accepts 0.8V–6.0V input and delivers 2.7V–6.0V output with >80% efficiency, 100µA no-load quiescent current, and 1µA shutdown mode-enabling extended runtime in pagers, remote controls, and low-power detectors.
For engineers reviewing the MAX867ESA+ datasheet, MAX867ESA+ pinout, MAX867ESA+ application, or MAX867ESA+ equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters across temperature, and real-world design implications for battery-powered portable electronics.
Technical Context
The MAX867ESA+ uses a PFM control scheme without an oscillator-relying on dual one-shots to set maximum LX on-time (4.5µs typ) and minimum off-time (1µs). Its N-channel power MOSFET features low gate threshold voltage (~0.8V typ) and ~1Ω on-resistance, enabling reliable start-up from weak batteries.
It integrates a precision 1.25V reference (±1.5% tolerance), low-battery detection (LBI/LBO with 1.25V threshold and 25mV hysteresis), and feedback regulation via FB pin. Output voltage is set externally using R1/R2 divider; reference load capability is 250µA source / 20µA sink with <±2% drift over load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.8V to 6.0V - supports full discharge of alkaline, NiMH, and Li-ion single cells without external LDO pre-regulation. |
| Output Voltage Range | 2.7V to 6.0V - adjustable via external resistor divider; enables flexible rail generation for mixed-voltage subsystems. |
| Efficiency | >80% over wide load range - minimizes thermal rise and extends battery life in space-constrained portable devices. |
| No-Load Supply Current | 100µA at VOUT = 3.3V - reduces standby drain, critical for infrequently polled sensors and backup supplies. |
| Shutdown Current | 1µA - ensures near-zero battery leakage during system sleep or storage modes. |
| Reference Voltage | 1.25V ±1.5% - stable internal reference usable for ADC biasing or external comparator thresholds. |
| Switching Frequency | Up to 250kHz - permits use of compact 330µH inductors and low-ESR ceramic/tantalum capacitors. |
Pinout & Package
MAX867ESA+ is housed in an 8-pin µMAX package (3.05mm × 3.05mm × 1.11mm height), specified for -40°C to +85°C operation and compatible with standard SO-8 reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX | N-channel power MOSFET drain | Switch node connecting to inductor; must be routed short and low-inductance to minimize ringing and EMI. |
| GND | Power ground | Low-impedance return path; requires direct solder connection to PCB ground plane for thermal and noise control. |
| OUT | Regulator output | Provides regulated output voltage and bootstrap power to internal circuitry; bypassed with 47µF tantalum capacitor. |
| LBI | Low-battery input | Analog input monitoring battery voltage via external resistor divider; triggers LBO when ≤1.25V (25mV hysteresis). |
| LBO | Low-battery open-drain output | Sinks current when LBI falls below threshold; requires external pull-up (≥100kΩ to OUT) for CMOS logic interfacing. |
| REF | 1.25V precision reference output | Stable voltage source for external circuits; bypassed with 0.22µF if loaded, ≥0.1µF if unloaded. |
| FB | Feedback input | Connects to resistor divider between OUT and GND; sets output voltage per VOUT = 1.25V × (1 + R1/R2). |
| SHDN | Shutdown control input | Active-low enable; pulls internal circuitry into 1µA sleep state; not clamped-can tolerate up to 7V regardless of VOUT. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low start-up voltage | 0.9V guaranteed - enables operation from deeply discharged alkaline or NiMH cells before regulation begins. |
| Integrated low-battery detector | 1.25V threshold with 25mV hysteresis - eliminates need for external supervisor IC in battery-gauging applications. |
| High-efficiency PFM control | No oscillator; variable frequency up to 250kHz - maintains >80% efficiency across 0.1mA–15mA loads without pulse-skipping artifacts. |
| Low-noise reference output | 1.25V ±1.5%, <±2% load regulation - suitable as precision bias for ADCs, comparators, or sensor signal chains. |
| Robust protection | Internal peak-current limiting (0.5A) and reverse-battery safe operation (750mA max) - prevents damage during miswiring or polarity reversal. |
Applications
| Pager Power Management | Remote Control Voltage Boost |
|---|---|
|
Use Scenario: Powers RF transmitter and display in compact pager designs using a single AA/AAA cell. IC Role / Device Role / Timing Role: Step-up regulator generating stable 3.3V rail from 0.9V–1.5V battery input; LBO signals end-of-life to host MCU. Use Value: Enables full functionality down to 0.9V battery voltage while consuming only 100µA in standby-extending usable battery life by >30% vs. fixed-output alternatives. |
Use Scenario: Supplies 5V to infrared LED driver in TV remote controls powered by one alkaline cell. IC Role / Device Role / Timing Role: Adjustable boost converter delivering 5.0V ±2% with fast transient response to pulsed IR bursts. Use Value: Maintains consistent LED brightness across full battery discharge (1.5V → 0.9V) without requiring battery replacement until true end-of-life. |
| Portable Gas Detector | Backup Supply for RTC/Memory |
|
Use Scenario: Powers electrochemical sensor interface and microcontroller in handheld gas analyzers. IC Role / Device Role / Timing Role: Generates clean 3.3V supply with <15mV ripple; REF pin biases analog front-end; LBI monitors battery health. Use Value: Eliminates need for discrete supervisor and reference ICs-reducing BOM count by 2 components and PCB area by 0.2in². |
Use Scenario: Provides hold-up power to real-time clock and SRAM during main supply interruption in industrial controllers. IC Role / Device Role / Timing Role: Low-quiescent boost converter maintaining 3.3V rail from backup coin cell; SHDN controlled by system power-fail signal. Use Value: Delivers 100µA standby current-enabling >5-year backup runtime from BR2032 cell without periodic maintenance. |
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 |
|---|---|---|---|
| TPS61099YFFR | Fixed 3.3V/5.0V outputs only; no adjustable FB pin; 0.7V min start-up; 400nA shutdown current. | Lacks LBI/LBO and REF output; unsuitable for battery monitoring or external reference needs. | Choose for ultra-low shutdown current where adjustable output and supervision are unnecessary. |
| LT3467EDD | Higher 1.2MHz switching frequency; requires external compensation; 2.5V–16V input; no integrated LBI/LBO. | Needs larger external components; lacks integrated battery monitor; better suited for higher-power or wide-input apps. | Prefer when >100mA output current or tighter output regulation under dynamic load is required. |
Compared with TPS61099YFFR and LT3467EDD, the MAX867ESA+ uniquely combines adjustable output, integrated low-battery detection, and a precision reference in an ultra-small µMAX package-making it optimal for space- and intelligence-constrained single-cell systems where component count and supervisory capability matter.
Availability
MAX867ESA+ is available at Aetrix Electronics and suitable for pagers, remote controls, portable detectors, and backup supplies requiring stable component supply with long-term manufacturability and industrial temperature support.
Supply support for MAX867ESA+ 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, medical, and portable applications.
The MAX867ESA+ belongs to Maxim's ultra-low-power DC-DC converter product line, designed specifically for extending battery life in compact, single-cell-powered portable electronics with integrated system supervision.
FAQ
What is the minimum input voltage required for the MAX867ESA+ to start regulating?
The MAX867ESA+ guarantees start-up at 0.9V under no-load conditions. Actual start-up voltage increases with load current and inductor value-e.g., 1.0V at 10mA with 330µH inductor. Once started, it sustains regulation down to ~0.8V input. This behavior is confirmed in the Typical Operating Characteristics curves (Figure 27) and Electrical Characteristics table (Minimum Start-Up Supply Voltage parameter) of the official MAX866/MAX867 datasheet.
Can the MAX867ESA+ be used with a fixed 3.3V output instead of adjustable configuration?
No-the MAX867ESA+ is the adjustable version and requires external resistors on FB to set output voltage. For fixed 3.3V/5V output, the MAX866ESA+ is the correct variant. The MAX867ESA+ does not support pin-selectable outputs; its 3/5 pin is absent, replaced by FB. This distinction is clearly defined in the Ordering Information and Pin Configurations sections of the datasheet.
How does the low-battery detection function work on the MAX867ESA+?
The MAX867ESA+ uses the LBI pin to monitor battery voltage via an external resistor divider. When LBI voltage drops below 1.25V (with 25mV hysteresis), the open-drain LBO pin sinks current. LBO requires an external pull-up (≥100kΩ to OUT) to interface with logic. If unused, connect LBI to VIN and leave LBO open. This implementation is detailed in the "Low-Battery Detection" section and Figure 3 of the datasheet.
What is the purpose of the REF pin on the MAX867ESA+ and how should it be bypassed?
The REF pin delivers a precision 1.25V ±1.5% reference usable for external circuits like ADC biasing or comparator thresholds. When driving a load ≤250µA, bypass REF with 0.22µF to GND. If unloaded, ≥0.1µF suffices. Load regulation remains <±2% across full 20µA sink to 250µA source range-verified in Electrical Characteristics Table and Figure 11 of the datasheet.
Is the MAX867ESA+ pin-compatible with the MAX866ESA+?
No-MAX867ESA+ and MAX866ESA+ have different pinouts. MAX866 uses pin 2 for 3/5 selection; MAX867 replaces it with FB. Pin 3 is REF on both, but MAX866 pin 2 is 3/5 while MAX867 pin 2 is FB. This difference is explicitly shown in the "Pin Configurations" diagram and "Pin Description" table of the datasheet-PCB layout and schematic must be redesigned for interchange.
MAX867ESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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):
- 6V
- Voltage - Output (Min/Fixed):
- 2.7V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 15mA
- Frequency - Switching:
- 250kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX867ESA+ FAQ
1.How can I place an order for MAX867ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX867ESA+ 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 MAX867ESA+ reliable?
The price and inventory of MAX867ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX867ESA+ is usually 5 days.
3.What payment methods are accepted for MAX867ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX867ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX867ESA+?
MAX867ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX867ESA+ 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 MAX867ESA+?
For technical support, including MAX867ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX867ESA+ requirements.
6.How does Aetrix verify that MAX867ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX867ESA+ 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 MAX867ESA+ meets industry standards.
7.What is the process for return or replacement of MAX867ESA+?
All MAX867ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX867ESA+, 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 MAX867ESA+ part is unused and in its original packaging.
Return procedure for MAX867ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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