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Analog Devices Inc./Maxim Integrated MAX667CPA+
- Part No.:
- MAX667CPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX667CPA+.pdf
- Description:
- IC REG LIN POS ADJ 250MA 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:173
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Product details
Overview
MAX667CPA+ from Maxim Integrated is a low-dropout linear voltage regulator delivering up to 250mA output current with typical dropout of 150mV at 200mA, 20µA quiescent current in normal mode, and dual-mode operation (fixed +5V or adjustable 1.3V–16V output). It integrates low-battery detection (LBI/LBO), dropout warning (DD), and shutdown control-designed for battery-powered instrumentation and portable devices requiring stable low-power regulation.
For engineers reviewing the MAX667CPA+ datasheet, MAX667CPA+ pinout, MAX667CPA+ application, or MAX667CPA+ equivalent, key selection criteria include dropout voltage vs. load, shutdown threshold accuracy, LBO open-drain sink capability, SET input bias current (<10nA), and compatibility with 10µF output capacitor stability requirements.
Technical Context
The MAX667CPA+ uses a micropower PNP pass transistor with trimmed 1.22V bandgap reference and error amplifier feedback routed either through internal resistors (for +5V fixed mode) or external SET-pin divider (for programmable output). Its Dual Mode™ architecture enables seamless transition between minimal-component fixed regulation and precision-adjustable operation without external compensation.
Three integrated comparators provide system-level monitoring: one selects operating mode (C1), one implements low-battery detection (C2, referenced to 1.22V), and one drives the DD dropout warning output-a PNP collector that sources current when VIN–VOUT falls below ~300mV. SHDN disables all outputs and reduces IQ to <1µA when pulled above 1.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 250mA max - supports moderate-power microcontrollers and analog sensors without thermal derating in DIP package at +70°C ambient. |
| Dropout Voltage | 150mV typ at 200mA - enables >95% efficiency from 5.2V input to 5V output, extending usable battery life in single-cell Li-ion or 4xAA systems. |
| Quiescent Current | 20µA typ (normal), 0.2µA typ (shutdown) - critical for multi-year battery life in always-on pagers and solar-powered instruments. |
| Input Voltage Range | +3.5V to +16.5V - accommodates wide-input battery stacks (e.g., 3×AA to 10×NiMH) and unregulated wall adapters. |
| SET Reference Voltage | 1.225V ±25mV - enables accurate programmable output using standard 1% resistors (e.g., R1=1MΩ, R2=3.1MΩ for 5.0V) without trimming. |
| Low-Battery Threshold | 1.225V on LBI - allows configurable undervoltage lockout (e.g., 5.5V threshold via 8.2MΩ/2.4MΩ divider) with <10nA input leakage. |
| Shutdown Threshold | VIL = 0.3V, VIH = 1.5V - ensures clean disable with CMOS logic levels and prevents false triggering from noise. |
Pinout & Package
MAX667CPA+ is housed in an 8-pin plastic DIP package (0°C to +70°C operating range), with through-hole mounting and standard 0.3" width. Pin spacing and layout comply with JEDEC MS-001.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - DD | Dropout detector output | PNP collector open-circuit output; sources current when VIN–VOUT < ~300mV - used to trigger early-warning circuits or enable backup power switchover. |
| 2 - OUT | Regulated output | Main power rail; requires 10µF output capacitor (min ESR per temp curve) for stability; drops to 0V when SHDN active. |
| 3 - LBI | Low-battery input | CMOS comparator input referenced to 1.22V; accepts resistive divider for custom UVLO thresholds; <10nA bias current enables high-R dividers. |
| 4 - GND | Ground reference | Analog and power ground common node; must be low-impedance return path for LBO sink and output capacitor. |
| 5 - SHDN | Shutdown control | Active-high CMOS input; pulls >1.5V to disable OUT, LBO, DD and reduce IQ to <1µA; max voltage = VIN + 0.3V. |
| 6 - SET | Output voltage select | Feedback node: grounded for +5V fixed mode; >50mV above GND enables external resistor divider for 1.3V–16V output. |
| 7 - LBO | Low-battery output | Open-drain N-channel FET; sinks current to GND when LBI < 1.22V - requires external pull-up (≥10kΩ to VOUT) for logic-level signaling. |
| 8 - IN | Unregulated input | Positive supply input; absolute max +18V; must exceed VOUT by ≥ dropout voltage to maintain regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ operation | Hardware-selectable fixed +5V (SET = GND) or adjustable output (SET > 50mV) - eliminates BOM variants and simplifies design reuse across product families. |
| Low-battery detector with LBO | Internally referenced 1.22V comparator with open-drain output - enables fail-safe shutdown or user alert without external supervisor IC. |
| Dropout warning (DD output) | PNP-source output activated near regulation limit - provides analog or digital advance warning of impending dropout, enabling graceful power management. |
| Micropower shutdown | 0.2µA typical quiescent current in SHDN mode - preserves battery charge during storage or sleep states in portable medical and metering devices. |
| Stable with 10µF capacitor | Guaranteed stability with standard 10µF aluminum electrolytic or tantalum output cap - avoids costly low-ESR ceramics and simplifies layout in cost-sensitive designs. |
Applications
| Battery-Powered Instruments | Pagers & Remote Receivers |
|---|---|
Use Scenario: Handheld multimeter powered by 4×AA alkaline cells, operating from 6.4V (fresh) down to 4.2V (end-of-life). IC Role / Device Role / Timing Role: Primary 5V supply regulator with integrated low-battery detection to blank display and log final readings before shutdown. Use Value: 150mV dropout extends usable battery life by >20% vs. legacy 300mV regulators; LBO signal triggers EEPROM save at 4.5V threshold. |
Use Scenario: Two-way pager receiving intermittent RF bursts, requiring ultra-low standby current between wake cycles. IC Role / Device Role / Timing Role: Always-on 5V rail generator with SHDN controlled by baseband processor to cut regulator IQ to 0.2µA during idle. Use Value: 20µA normal-mode IQ and sub-µA shutdown enable multi-week standby on CR2032 coin cell; DD output pre-warns of weak battery before missed message. |
| Solar-Powered Data Loggers | Portable Medical Sensors |
Use Scenario: Field-deployed environmental logger with supercapacitor buffer, charging from small solar panel (3–8V output). IC Role / Device Role / Timing Role: Input-voltage-flexible regulator accepting variable solar input while maintaining stable 5V for MCU and ADC. Use Value: +3.5V to +16.5V input range accommodates unregulated solar harvest; SET pin enables precise 3.3V output for low-voltage sensors without extra LDO. |
Use Scenario: Wearable pulse oximeter using AAA batteries, requiring clean 5V for analog front-end and low-noise 3.3V for digital core. IC Role / Device Role / Timing Role: First-stage 5V regulator feeding secondary LDO; LBI monitors battery health to prevent inaccurate SpO₂ readings from brownout. Use Value: 1.22V LBI reference matched to battery discharge curve; 250mA output supports simultaneous LED drive and signal processing peaks. |
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 |
|---|---|---|---|
| LT1129CS8-5#PBF | Fixed +5V only; 120mV dropout at 200mA; 50µA IQ; no LBI/LBO or DD outputs. | Lacks integrated battery monitoring and dropout warning - requires external supervisor for same functionality. | Choose when only basic 5V regulation is needed and board space permits discrete monitoring circuitry. |
| TPS76350DBVR | Fixed +5V; 220mV dropout at 150mA; 17µA IQ; includes active-low RESET but no LBI input or DD output. | Provides power-on reset but no programmable low-battery threshold or analog dropout warning. | Prefer for cost-sensitive consumer devices where RESET suffices and dropout margin is acceptable. |
Compared with LT1129CS8-5#PBF and TPS76350DBVR, the MAX667CPA+ uniquely combines adjustable/fixed output, ultra-low IQ shutdown, and three integrated monitoring functions (LBO, DD, SHDN) in a single 8-pin DIP-reducing component count and PCB area in space-constrained portable designs.
Availability
MAX667CPA+ is available at Aetrix Electronics and suitable for battery-powered instruments, pagers and radio control receivers, and solar-powered data loggers requiring stable component supply with long-term lifecycle support.
Supply support for MAX667CPA+ 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 MAX667CPA+ belongs to Maxim's micropower linear regulator product line, designed specifically for battery-operated portable equipment where extended runtime, accurate voltage monitoring, and minimal external components are critical.
FAQ
What is the maximum input voltage rating for the MAX667CPA+?
The MAX667CPA+ has an absolute maximum input voltage of +18V. Operation beyond this rating risks permanent damage. For reliable continuous operation, the input voltage must remain within the specified range of +3.5V to +16.5V, as defined in the Electrical Characteristics table. Exceeding +16.5V may cause regulation failure or increased quiescent current even if below the absolute maximum.
Can the MAX667CPA+ be used to generate an output voltage other than +5V?
Yes, the MAX667CPA+ supports adjustable output 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 external resistor network sets VOUT = 1.225V × (R1 + R2)/R1. This Dual Mode™ operation enables flexible voltage scaling without changing the IC.
How does the dropout detector (DD) output function in the MAX667CPA+?
The DD pin is the collector of an internal PNP transistor that begins sourcing current when VIN–VOUT falls below approximately 300mV. As the differential decreases further, DD current increases abruptly-providing an analog warning signal before regulation is lost. A 100kΩ resistor to ground converts this to a measurable voltage for monitoring or comparator input.
What is the recommended output capacitor for stable operation of the MAX667CPA+?
A 10µF aluminum electrolytic or tantalum capacitor is recommended at the OUT pin. Stability requires sufficient ESR: minimum values range from ~1Ω at –40°C to ~5Ω at +125°C (per Figure 4). If using low-ESR capacitors (e.g., OS-CON or ceramic), add a series resistor to meet the required ESR. Avoid ceramic-only solutions without series resistance.
Does the MAX667CPA+ require a heatsink under full-load conditions?
No heatsink is required for the MAX667CPA+ in its 8-pin plastic DIP package at ambient temperatures ≤+70°C and output currents ≤250mA, provided the input-output differential remains within power dissipation limits. At +70°C, the package can dissipate up to 727mW (derated above that temperature). For example, at 200mA and 1.5V differential, power dissipation is 300mW - well within safe limits.
MAX667CPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX667CPA+ FAQ
1.How can I place an order for MAX667CPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX667CPA+ 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 MAX667CPA+ reliable?
The price and inventory of MAX667CPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX667CPA+ is usually 5 days.
3.What payment methods are accepted for MAX667CPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX667CPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX667CPA+?
MAX667CPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX667CPA+ 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 MAX667CPA+?
For technical support, including MAX667CPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX667CPA+ requirements.
6.How does Aetrix verify that MAX667CPA+ is sourced from the original manufacturer or authorized distributors?
All MAX667CPA+ 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 MAX667CPA+ meets industry standards.
7.What is the process for return or replacement of MAX667CPA+?
All MAX667CPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX667CPA+, 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 MAX667CPA+ part is unused and in its original packaging.
Return procedure for MAX667CPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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