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Analog Devices Inc./Maxim Integrated MAX667MSA/PR+
- Part No.:
- MAX667MSA/PR+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX667MSA/PR+.pdf
- Description:
- IC REG LIN POS ADJ 250MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,347
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Product details
Overview
The MAX667MSA/PR+ from Maxim Integrated is a low-dropout, positive linear voltage regulator delivering up to 250mA output current with typical dropout of 150mV at 200mA load and quiescent current of 20µA in normal operation. It features Dual Mode™ operation (fixed +5V or adjustable 1.3V–16V output), integrated low-battery detector (LBI/LBO), dropout detector (DD), and shutdown control (SHDN), making it suitable for battery-powered instrumentation requiring stable, low-power regulation across extended temperature ranges.
For engineers reviewing the MAX667MSA/PR+ datasheet, MAX667MSA/PR+ pinout, MAX667MSA/PR+ application, or MAX667MSA/PR+ equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters across –55°C to +125°C, and real-world design implications for micropower LDO selection in harsh-environment portable systems.
Technical Context
The MAX667MSA/PR+ employs a PNP pass transistor architecture with a trimmed 1.225V internal bandgap reference and dual-comparator supervision: one selects fixed/adjustable mode via the SET pin, the other implements low-battery detection using the LBI input and open-drain LBO output. Its dropout detector (DD) is an open-collector PNP output that sources current when VIN–VOUT falls below ~300mV, enabling early warning of regulation loss.
Dual Mode™ operation is controlled by the SET pin: grounding SET enables fixed +5V output using internal feedback resistors; applying >50mV to SET switches to external resistor-programmable mode (VOUT = 1.225V × (R1+R2)/R1). Shutdown (SHDN) disables output and reduces quiescent current to <1µA when driven above 1.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 250mA maximum - supports moderate-power microcontrollers and analog sensors without external boost stages. |
| Dropout Voltage | 150mV typical at 200mA - enables usable battery life extension down to ~3.65V for 5V systems. |
| Quiescent Current | 20µA typical (normal), 0.2µA typical (shutdown) - critical for multi-year battery operation in pagers and solar instruments. |
| Input Voltage Range | +3.5V to +16.5V - accommodates single Li-ion, multi-cell alkaline, or regulated intermediate rails. |
| Output Accuracy | ±2% over –55°C to +125°C - ensures reliable logic-level compliance and ADC reference stability in wide-temperature deployments. |
| SET Reference Voltage | 1.225V ±25mV - enables precise programmable output with standard 1% resistors; no trimming required in most cases. |
| Low-Battery Threshold | 1.225V on LBI input - configurable via external divider to match battery chemistry end-of-life voltage (e.g., 5.5V threshold with R3=8.2MΩ/R4=2.4MΩ). |
Pinout & Package
MAX667MSA/PR+ is supplied in an 8-pin SO package (SOIC-8, 150mil width), rated for –55°C to +125°C operation and qualified per MIL-STD-883 requirements for high-reliability applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - DD | Dropout Detector Output | Open-collector PNP output sourcing current as VIN–VOUT approaches dropout; used for early-warning signaling or auto-shutdown circuits. |
| 2 - OUT | Regulated Output | Main power rail output; requires ≥10µF capacitor (with sufficient ESR) for stability; drops to 0V when SHDN is active. |
| 3 - LBI | Low-Battery Input | CMOS input to internal 1.225V comparator; sets battery-fail threshold via external resistor divider; input leakage ≤10nA. |
| 4 - GND | Ground Reference | Analog and power ground common node; must be low-impedance connection to minimize noise coupling into SET/LBI paths. |
| 5 - SHDN | Shutdown Control | CMOS input; pulls high (>1.5V) to disable OUT, LBO, and DD while reducing IQ to <1µA; max voltage = VIN + 0.3V. |
| 6 - SET | Output Voltage Select | CMOS input; grounded for fixed +5V; >50mV enables adjustable mode using external R1/R2; bias current ≤10nA. |
| 7 - LBO | Low-Battery Output | Open-drain N-channel output sinking current to GND when LBI < 1.225V; requires external pull-up (≥10kΩ to VOUT). |
| 8 - IN | Unregulated Input | Positive supply input; absolute max +18V; must exceed VOUT by ≥150mV under full load to maintain regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ Output Configuration | Fixed +5V (zero external components) or adjustable 1.3V–16V via two resistors - eliminates BOM variants and simplifies design reuse across voltage requirements. |
| Integrated Supervision Functions | Single-chip integration of low-battery detection (LBI/LBO), dropout warning (DD), and shutdown (SHDN) - removes need for discrete comparators and reduces PCB area by >30%. |
| Micropower Operation | 20µA typical quiescent current at 200mA load - enables >10-year battery life in 10µA-average-current devices like remote sensors. |
| Extended Temperature Range | –55°C to +125°C operation with full parameter guarantees - qualified for aerospace, downhole, and military vehicle applications where commercial-grade regulators fail. |
| Stable with Low-ESR Capacitors | Compatible with aluminum electrolytic, tantalum, and OS-CON capacitors; minimum ESR defined per temperature (e.g., 2Ω at –40°C) - avoids instability issues common in PNP-LDOs. |
Applications
| Portable Medical Sensors | Satellite Telemetry Modules |
|---|---|
|
Use Scenario: Continuous glucose monitor powered by coin-cell battery with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Primary 5V power rail regulator with shutdown-controlled periodic wake-up and low-battery alert to trigger data upload before depletion. Use Value: 20µA quiescent current and accurate 1.225V LBI threshold enable precise end-of-life prediction and >9-year operational lifetime without maintenance. |
Use Scenario: Radiation-tolerant telemetry board in low-Earth orbit satellite with thermal cycling from –45°C to +110°C. IC Role / Device Role / Timing Role: Regulator for FPGA configuration memory and RF transceiver bias, monitored via DD output for input voltage margining during solar array degradation. Use Value: Guaranteed –55°C to +125°C operation and 150mV dropout ensure uninterrupted power delivery despite orbital thermal extremes and aging power sources. |
| Downhole Oilfield Instrumentation | Industrial Handheld Testers |
|
Use Scenario: High-pressure, high-temperature (HTHP) probe deployed at 175°C wellbore with limited battery capacity. IC Role / Device Role / Timing Role: Local 5V regulator for MEMS pressure sensor and ADC, using DD output to preemptively throttle sampling rate as battery depletes. Use Value: PNP architecture maintains regulation at ultra-low dropout even as battery voltage sags below 4V, extending usable measurement window by 22% vs. NMOS-LDO alternatives. |
Use Scenario: Ruggedized multimeter with autoranging, Bluetooth LE, and 500-hour battery life specification. IC Role / Device Role / Timing Role: Dual-rail source: fixed 5V for display/backlight and adjustable 3.3V for MCU core via SET resistors, with LBO triggering low-power mode. Use Value: Single MAX667MSA/PR+ replaces two regulators and a supervisor IC, reducing bill-of-materials cost by $0.82 and saving 28 mm² PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX667ESA+ | Same silicon, rated for –40°C to +85°C only; lower max junction temperature and reduced long-term reliability at >85°C. | Suitable for commercial/industrial handhelds but not downhole or aerospace deployments requiring full –55°C qualification. | Select MAX667MSA/PR+ when operation beyond +85°C or MIL-STD-883 compliance is mandatory. |
| TPS76350QDBVRQ1 | Automotive-qualified (AEC-Q100), 150mA output, 220mV dropout at 150mA, higher IQ (85µA), no integrated LBO/DD/SET modes. | Requires external comparators for battery monitoring; lacks programmable output and dropout warning; designed for automotive infotainment, not extreme-temperature instrumentation. | Choose TPS76350QDBVRQ1 only if AEC-Q100 certification is required and supervision features are implemented externally. |
Compared with MAX667ESA+, the MAX667MSA/PR+ delivers guaranteed operation at –55°C and +125°C with identical electrical performance, enabling deployment in environments where thermal stress invalidates commercial-grade alternatives; versus TPS76350QDBVRQ1, it integrates three supervision functions in one die while supporting higher output current and lower quiescent power - reducing system complexity and extending battery life in unattended field instruments.
Availability
MAX667MSA/PR+ is available at Aetrix Electronics and suitable for portable medical sensors, satellite telemetry modules, downhole oilfield instrumentation, and industrial handheld testers requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for MAX667MSA/PR+ 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, automotive, and aerospace applications.
The MAX667 belongs to Maxim's micropower LDO regulator family, engineered specifically for battery-critical systems requiring ultra-low quiescent current, integrated power supervision, and guaranteed operation across military temperature ranges.
FAQ
What is the guaranteed operating temperature range for the MAX667MSA/PR+?
The MAX667MSA/PR+ is specified for continuous operation from –55°C to +125°C, with all electrical parameters fully guaranteed across this range. This rating reflects MIL-STD-883 qualified screening and is documented in the official Maxim datasheet revision 4 (9/08) under Ordering Information and Absolute Maximum Ratings. The "M" grade suffix explicitly denotes this extended temperature capability.
Does the MAX667MSA/PR+ require an external capacitor on the OUT pin, and what are the ESR requirements?
Yes, the MAX667MSA/PR+ requires a minimum 10µF output capacitor for stability, as confirmed in the Typical Operating Circuit and Applications Information sections. The capacitor's ESR must meet temperature-dependent minimum values (e.g., 2Ω at –40°C, 1Ω at +25°C) shown in Figure 4. Aluminum electrolytic, tantalum, or OS-CON types are acceptable; series resistance may be added if ESR is too low.
How does the SET pin determine whether the MAX667MSA/PR+ operates in fixed or adjustable mode?
The MAX667MSA/PR+ uses internal comparator C1 to detect SET pin voltage: when SET is ≤50mV above GND, the device uses internal feedback resistors for fixed +5V output; when SET is >50mV, it switches to external resistor-divider mode (VOUT = 1.225V × (R1+R2)/R1). This Dual Mode™ behavior is detailed in the Detailed Description and Pin Description sections.
Can the MAX667MSA/PR+ be used with lithium-ion battery input, and what is the minimum input voltage for 5V regulation?
Yes - the MAX667MSA/PR+ accepts input voltages from +3.5V to +16.5V, making it compatible with single-cell Li-ion (fully charged at ~4.2V, depleted at ~3.0V). For sustained 5V output, VIN must remain ≥5.15V (5V + 150mV typical dropout) at 200mA load. Below that, regulation is lost and DD activates to warn of impending failure.
What is the function of the DD pin on the MAX667MSA/PR+, and how is it typically used in circuit design?
The DD pin is a dropout detector output - an open-collector PNP transistor that begins sourcing current when VIN–VOUT falls below ~300mV. As shown in Figure 3 and Applications Information, it is commonly connected to a 100kΩ pull-down resistor to generate a voltage ramp that feeds an ADC or comparator, providing early warning of regulation loss before system reset occurs.
MAX667MSA/PR+ 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:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable (Fixed)
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 16.5V
- Voltage - Output (Min/Fixed):
- 1.3V (5V)
- Voltage - Output (Max):
- 16V
- Voltage Dropout (Max):
- 0.15V @ 200mA
- Current - Output:
- 250mA
- Current - Quiescent (Iq):
- 35 µA
- Current - Supply (Max):
- 20 µA
- PSRR:
- -
- Control Features:
- Dropout Detector, Enable, Low Battery Detection
- Protection Features:
- -
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX667MSA/PR+ FAQ
1.How can I place an order for MAX667MSA/PR+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX667MSA/PR+ 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 MAX667MSA/PR+ reliable?
The price and inventory of MAX667MSA/PR+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX667MSA/PR+ is usually 5 days.
3.What payment methods are accepted for MAX667MSA/PR+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX667MSA/PR+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX667MSA/PR+?
MAX667MSA/PR+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX667MSA/PR+ 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 MAX667MSA/PR+?
For technical support, including MAX667MSA/PR+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX667MSA/PR+ requirements.
6.How does Aetrix verify that MAX667MSA/PR+ is sourced from the original manufacturer or authorized distributors?
All MAX667MSA/PR+ 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 MAX667MSA/PR+ meets industry standards.
7.What is the process for return or replacement of MAX667MSA/PR+?
All MAX667MSA/PR+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX667MSA/PR+, 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 MAX667MSA/PR+ part is unused and in its original packaging.
Return procedure for MAX667MSA/PR+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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