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Analog Devices Inc./Maxim Integrated MAX667CSA+
- Part No.:
- MAX667CSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX667CSA+.pdf
- Description:
- IC REG LIN POS ADJ 250MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,246
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Product details
Overview
The MAX667CSA+ 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. It features Dual Mode™ operation-fixed +5V output (internal feedback) or adjustable 1.3V–16V output (external resistor divider)-plus integrated low-battery detection (LBI/LBO), dropout warning (DD), and shutdown control (SHDN). It is widely used in battery-powered portable instruments and solar-powered devices requiring micropower regulation and end-of-life battery monitoring.
For engineers reviewing the MAX667CSA+ datasheet, MAX667CSA+ pinout, MAX667CSA+ application, or MAX667CSA+ equivalent, key selection considerations include its 20µA typical quiescent current in normal mode, 0.2µA in shutdown, ±2% output voltage accuracy at +5V, 3.5V–16.5V input range, and SO-8 package compatibility with legacy MAX666 designs above +3.5V input.
Technical Context
The MAX667CSA+ uses a PNP pass transistor architecture with a trimmed 1.225V internal bandgap reference and dual-comparator supervision circuitry. Its error amplifier compares either internal fixed-divider or external SET-pin feedback to regulate output, while comparator C2 monitors LBI against the same reference for low-battery signaling.
Dropout detection is implemented via DD-a PNP collector output that begins sourcing current when VIN–VOUT falls below ~300mV-enabling early warning of regulation loss. Shutdown disables OUT, LBO, and DD while reducing IQ to <1µA, and the device maintains stability with a minimum 10µF output capacitor and sufficient ESR per temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 250mA max-supports moderate-power microcontrollers and analog sensors without external pass devices. |
| Dropout Voltage | 150mV typ at 200mA-enables >95% usable battery voltage range in 3.7V Li-ion or 4xAA alkaline systems. |
| Quiescent Current | 20µA typ normal / 0.2µA typ shutdown-critical for multi-year battery life in always-on pagers and remote sensors. |
| Output Voltage | +5V fixed (SET = GND) or 1.3V–16V adjustable (SET > 50mV)-flexible for mixed-voltage subsystems with minimal BOM. |
| Input Voltage Range | +3.5V to +16.5V-covers wide battery chemistries (2×LiFePO₄, 4×Alkaline, 12V lead-acid backup) and unregulated wall adapters. |
| Low-Battery Threshold | 1.225V ref at LBI-configurable via external divider for precise end-of-life detection (e.g., 5.5V threshold with R3/R4 = 8.2MΩ/2.4MΩ). |
| Shutdown Threshold | 1.5V min on SHDN-CMOS-compatible logic-level control with <10nA leakage, enabling direct MCU GPIO drive. |
Pinout & Package
MAX667CSA+ is housed in an 8-pin SO (Small Outline) package, surface-mount compatible, with standard JEDEC MS-012AC footprint (5.0mm × 6.2mm, 1.75mm height, 1.27mm pitch). Thermal performance supports 471mW continuous dissipation at +70°C ambient, derating 5.88mW/°C above.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - DD | Dropout Detector Output | PNP collector open-circuit output; sources current when VIN–VOUT ≤ ~300mV-used for analog warning or digital flag generation. |
| 2 - OUT | Regulated Output | Main power rail; requires ≥10µF output capacitor with specified ESR for stability; drops to 0V when SHDN active. |
| 3 - LBI | Low-Battery Input | CMOS comparator input referenced to 1.225V; accepts resistive divider to set custom battery threshold (e.g., 3.0V, 4.2V). |
| 4 - GND | Ground Reference | Power and signal return; must be low-impedance path to minimize noise coupling into sensitive LBI/SET nodes. |
| 5 - SHDN | Shutdown Control | Active-high enable; pulls >1.5V to disable regulator, LBO, and DD; draws <10nA leakage-directly driven by µC I/O. |
| 6 - SET | Voltage Set Input | Selects operating mode: GND = fixed +5V; >50mV = adjustable output via external R1/R2 divider (VOUT = 1.225V × (R1+R2)/R1). |
| 7 - LBO | Low-Battery Output | Open-drain N-channel FET; sinks current when LBI < 1.225V-requires external pull-up (≥10kΩ to OUT) for CMOS interfacing. |
| 8 - IN | Unregulated Input | Raw supply input; withstands up to +18V absolute max; must exceed VOUT + dropout to maintain regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ Operation | Single IC supports both fixed +5V (zero external parts) and programmable 1.3V–16V outputs-reduces BOM count and design iterations. |
| Integrated Supervision | Three independent functions-low-battery detection (LBI/LBO), dropout warning (DD), and shutdown (SHDN)-eliminate need for discrete supervisors. |
| Micropower Performance | 20µA typical quiescent current enables >10-year battery life in 10µA average-load applications like wireless sensor nodes. |
| Stable with Ceramic-Compatible ESR | Minimum ESR requirements defined across –40°C to +85°C (e.g., 1.5Ω at +25°C); allows use of low-cost aluminum electrolytics without series resistor. |
| Robust Input Tolerance | Withstands +18V absolute max input and 1-second short-circuit events-enhances reliability in transient-prone battery and adapter inputs. |
Applications
| Battery-Powered Portable Instruments | Solar-Powered Remote Sensors |
|---|---|
|
Use Scenario: Handheld multimeters and data loggers powered by 4×AA alkaline batteries with 4.8V–6.4V nominal range. IC Role / Device Role / Timing Role: Primary 5V system regulator with LBO-driven low-battery alert and SHDN-controlled sleep mode during idle periods. Use Value: 20µA quiescent current extends battery life beyond 5 years; 150mV dropout preserves full measurement range until battery reaches ~4.5V. |
Use Scenario: Environmental monitoring nodes deployed in off-grid locations, powered by 6V solar panel + supercapacitor buffer. IC Role / Device Role / Timing Role: Stable 5V rail for MCU and ADC; DD output feeds comparator to trigger energy-saving duty cycling as solar input declines. Use Value: Dropout detector provides predictive warning before regulation loss, enabling graceful shutdown and data preservation prior to brownout. |
| Pagers and Radio Receivers | Low-Power Industrial Controllers |
|
Use Scenario: Two-way pagers using single-cell Li-ion (3.0V–4.2V) with RF front-end requiring clean 3.3V derived from 5V rail. IC Role / Device Role / Timing Role: +5V main regulator; SET pin configured for 5V output; LBI monitors battery via 2-resistor divider for 3.4V cutoff. Use Value: 0.2µA shutdown current prevents battery drain during standby; LBO open-drain output interfaces directly with pager's wake-up controller. |
Use Scenario: DIN-rail mounted PLC I/O modules powered from 12V DC bus, requiring isolated 5V for logic and 3.3V for communication ICs. IC Role / Device Role / Timing Role: Pre-regulator stage feeding downstream DC-DC converters; DD output signals upstream power supervisor of impending undervoltage. Use Value: 250mA output supports multiple downstream rails; 3.5V–16.5V input range accommodates wide industrial supply tolerances (±20%). |
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 |
|---|---|---|---|
| MAX666CSA+ | Lower output current (150mA), higher dropout (250mV @ 100mA), no DD pin, same SO-8 package and pinout. | Lacks dropout warning and supports lower load currents-suitable only where 250mA and predictive regulation loss detection are not required. | Choose MAX666CSA+ only if cost sensitivity outweighs performance needs and system can tolerate earlier, unannounced dropout. |
| TPS76350DBVR | Fixed 5V output only, 150mA max, 120mV dropout @ 150mA, 1.2µA quiescent current in shutdown, SOT-23-5 package. | Smaller footprint and lower IQ shutdown, but no adjustability, no LBI/LBO, no DD, and incompatible pinout-requires PCB redesign. | Consider TPS76350DBVR for space-constrained, fixed-rail designs where supervision features are handled externally or omitted. |
Compared with MAX666CSA+, the MAX667CSA+ delivers 67% higher output current and adds critical dropout warning (DD) and flexible output programming. Against TPS76350DBVR, it trades smaller size for comprehensive supervision and dual-mode flexibility-making it optimal for battery longevity and system reliability in portable instrumentation.
Availability
MAX667CSA+ is available at Aetrix Electronics and suitable for battery-powered portable instruments, solar-powered remote sensors, pagers and radio control receivers, and low-power industrial controllers requiring stable component supply with long-term lifecycle support.
Supply support for MAX667CSA+ 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, automotive, communications, and consumer markets.
The MAX667CSA+ belongs to Maxim's micropower linear regulator product line, designed specifically for battery-operated systems demanding ultra-low quiescent current, accurate low-voltage supervision, and seamless transition between fixed and adjustable output configurations.
FAQ
What is the maximum input voltage rating for the MAX667CSA+?
The MAX667CSA+ has an absolute maximum input voltage rating of +18V. Operation above this level risks permanent damage. For reliable continuous operation, the input should remain within the recommended range of +3.5V to +16.5V, as specified in the electrical characteristics table. Exceeding +16.5V-even briefly-may degrade long-term reliability or trigger overvoltage failure modes not covered by standard protection circuits.
Can the MAX667CSA+ be used to generate an output voltage other than +5V?
Yes, the MAX667CSA+ supports adjustable output voltages from +1.3V to +16V using two external resistors connected to the SET pin. When SET is held >50mV above ground, the internal feedback divider disconnects and the error amplifier references the SET node instead. The output is calculated as VOUT = 1.225V × (R1 + R2) / R1, where R1 connects OUT to SET and R2 connects SET to GND. This configuration is confirmed in the "Output-Voltage Selection" section of the datasheet.
How does the dropout detector (DD) pin function on the MAX667CSA+?
The DD pin on the MAX667CSA+ is the collector of an internal PNP transistor that begins sourcing current when the input-output differential falls below approximately 300mV. As VIN–VOUT decreases further-approaching the regulation limit-the DD current increases abruptly, providing an analog warning signal. A 100kΩ pull-down resistor converts this to a voltage usable by comparators or ADCs. This behavior is documented in the "Dropout Detector" section and verified in Figure 3 of the Typical Operating Characteristics.
What is the recommended output capacitor for stable operation of the MAX667CSA+?
The MAX667CSA+ requires a minimum 10µF output capacitor for stability, as explicitly stated in the General Description and Applications Information sections. Aluminum electrolytic capacitors are preferred due to their naturally sufficient ESR across temperature; tantalum or OS-CON types may be used with series resistance to meet the minimum ESR curve shown in Figure 4. Ceramic capacitors alone are not recommended unless paired with a series resistor calibrated to meet the ESR requirement at operating temperature.
Does the MAX667CSA+ provide reverse-battery or reverse-current protection?
No, the MAX667CSA+ does not include reverse-battery or reverse-current protection circuitry. Its PNP pass transistor architecture inherently blocks reverse current flow from OUT to IN, but the device offers no protection against reversed input polarity. Applying negative voltage to the IN pin-even briefly-exceeds the Absolute Maximum Rating of –0.3V and may cause irreversible damage. External protection diodes or MOSFET-based reverse-polarity circuits are required in applications where incorrect battery insertion is possible.
MAX667CSA+ 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
- 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):
- 0.35V @ 200mA
- Current - Output:
- 250mA
- Current - Quiescent (Iq):
- 35 µA
- Current - Supply (Max):
- 20 mA
- PSRR:
- -
- Control Features:
- Dropout Detector, Enable, Low Battery Detection
- Protection Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX667CSA+ FAQ
1.How can I place an order for MAX667CSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX667CSA+ 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 MAX667CSA+ reliable?
The price and inventory of MAX667CSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX667CSA+ is usually 5 days.
3.What payment methods are accepted for MAX667CSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX667CSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX667CSA+?
MAX667CSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX667CSA+ 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 MAX667CSA+?
For technical support, including MAX667CSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX667CSA+ requirements.
6.How does Aetrix verify that MAX667CSA+ is sourced from the original manufacturer or authorized distributors?
All MAX667CSA+ 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 MAX667CSA+ meets industry standards.
7.What is the process for return or replacement of MAX667CSA+?
All MAX667CSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX667CSA+, 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 MAX667CSA+ part is unused and in its original packaging.
Return procedure for MAX667CSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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