My Inquiry
My Account
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:1,428
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX667CPA 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 output or adjustable 1.3V–16V output via external resistors-and integrated low-battery detection (LBI/LBO), shutdown control (SHDN), and dropout warning (DD). It is used in battery-powered instrumentation where micropower efficiency and regulated supply stability are critical.
For engineers reviewing the MAX667CPA datasheet, MAX667CPA pinout, MAX667CPA application, or MAX667CPA equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters across temperature, real-world design implications of dropout behavior and quiescent current modes, and two rigorously cross-checked alternative regulators for similar low-power LDO applications.
Technical Context
The MAX667CPA uses a PNP pass transistor architecture enabling low dropout and micropower operation, with internal bandgap reference trimmed to 1.22V and error amplifier feedback selectable between on-chip divider (for +5V) or external SET resistor network (for programmable output). Its Dual Mode™ logic detects SET voltage >50mV to switch feedback path, ensuring accurate output regulation without trim pots.
It integrates three monitoring comparators: C1 for mode selection, C2 for low-battery detection (comparing LBI to 1.22V reference), and a dedicated dropout detector driving open-collector DD output. Shutdown disables OUT, LBO, and DD while reducing IQ to <1µA, and all control inputs (SHDN, LBI, SET) exhibit ≤10nA leakage for high-impedance interface compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 250mA maximum - supports moderate-load microcontrollers and analog sensors without external boost. |
| Dropout Voltage | 150mV typical at 200mA - enables operation down to ~3.65V input for +5V output, extending battery life. |
| Quiescent Current | 20µA typical (normal), 0.2µA typical (shutdown) - minimizes standby drain in always-on portable devices. |
| Input Voltage Range | +3.5V to +16.5V - accommodates single Li-ion, multi-cell alkaline, or solar harvesters with wide VIN swing. |
| Output Accuracy | ±2% over temperature - ensures reliable logic-level compliance for 5V TTL/CMOS systems. |
| SET Reference Voltage | 1.225V ±25mV - enables precise programmable output using standard 1% resistors without trimming. |
| Low-Battery Threshold | 1.22V reference at LBI - allows configurable undervoltage lockout via external resistor divider. |
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 footprint comply with JEDEC MS-001.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 8) | Unregulated positive input supply | Accepts +3.5V to +16.5V; must be ≥ VOUT + dropout voltage for regulation. |
| LBO (Pin 7) | Open-drain low-battery indicator output | Sinks current when LBI < 1.22V; requires external pull-up to VOUT or logic rail ≤ VOUT. |
| LBI (Pin 3) | Low-battery comparator input | High-impedance CMOS input (≤10nA leakage); sets threshold via resistor divider from IN or VOUT. |
| SET (Pin 6) | Voltage feedback select and adjust node | Grounded for fixed +5V; >50mV above GND switches to external resistor divider for programmable output. |
| GND (Pin 4) | Analog and power ground reference | Common return for all internal circuitry; must be low-impedance connection to minimize noise coupling. |
| SHDN (Pin 5) | Active-high shutdown control | Pull ≥1.5V to disable regulator, LBO, and DD; reduces IQ to <1µA; max voltage = VIN + 0.3V. |
| OUT (Pin 2) | Regulated output voltage | Requires 10µF output capacitor (min ESR per Figure 4); drops to 0V when SHDN is active. |
| DD (Pin 1) | Dropout detector open-collector output | Sources current as VIN–VOUT approaches ~300mV; used for early-warning flag or auto-shutdown via R–C network. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ Output Configuration | Fixed +5V (zero external parts) or 1.3V–16V adjustable via two resistors - eliminates BOM variants and simplifies design reuse. |
| Integrated Low-Battery Detection | 1.22V precision reference with open-drain LBO - enables system-level battery monitoring without external comparator or reference. |
| Dropout Warning Output (DD) | PNP-based open-collector signal that rises sharply below ~300mV VIN–VOUT - provides deterministic early-alert before regulation loss. |
| Micropower Shutdown Mode | Quiescent current <1µA when SHDN high - extends shelf life and sleep-mode duration in remote sensor nodes. |
| Stable with Standard Capacitors | Guaranteed stability with 10µF aluminum electrolytic (no series resistor needed in most cases) - reduces cost and board space vs. specialty ceramics. |
Applications
| Battery-Powered Instruments | Pagers and Radio Control Receivers |
|---|---|
Use Scenario: Handheld multimeter powered by 4×AA alkaline cells, requiring stable +5V for ADC and display during variable load. IC Role / Device Role / Timing Role: Primary voltage regulator maintaining 5V rail despite battery decay from 6.4V to 4.0V. Use Value: 150mV dropout at 200mA allows full regulation until battery reaches ~4.15V, maximizing usable capacity. |
Use Scenario: Miniature RC receiver module with intermittent RF burst transmission and deep sleep cycles. IC Role / Device Role / Timing Role: Power management IC supplying clean 5V to RF front-end and microcontroller, with SHDN synchronized to sleep mode. Use Value: 0.2µA shutdown current prevents measurable battery drain during weeks-long storage. |
| Solar-Powered Data Loggers | Portable Medical Sensors |
Use Scenario: Field-deployed environmental logger harvesting energy from small solar panel into supercapacitor buffer. IC Role / Device Role / Timing Role: LDO regulating variable solar input (4.2V–15V) to fixed 5V for MCU and SD card interface. Use Value: Wide 3.5V–16.5V input range accepts unregulated solar output; DD output triggers data save before brownout. |
Use Scenario: Wearable pulse oximeter using coin cell, requiring ultra-low-noise 5V for analog front-end and optical drivers. IC Role / Device Role / Timing Role: Precision voltage source with low PSRR and minimal thermal drift across body-temperature range. Use Value: 20µA quiescent current and ±2% output accuracy ensure consistent analog performance and >1-year battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP2951ACN/NOPB | Fixed 5V or adjustable output; 100mA max output; 350mV dropout at 100mA; no integrated LBO or DD outputs. | Lacks battery monitoring and dropout warning; suitable only where those features are handled externally. | Select when cost sensitivity outweighs feature count and output current requirement is ≤100mA. |
| TPS76350DBVR | Fixed 5V output only; 150mA max; 220mV dropout at 150mA; 1.2µA shutdown current; no LBI/SET/DD pins. | No programmability or battery monitoring; optimized for ultra-low-IQ but limited functionality and current. | Choose for space-constrained PCBs needing minimal external components and <150mA load, where SHDN IQ is critical. |
Compared with LP2951ACN/NOPB and TPS76350DBVR, the MAX667CPA delivers higher output current (250mA), lower dropout (150mV), and unique integrated monitoring (LBO, DD) and dual-mode flexibility - making it the sole option among the three capable of self-contained battery-aware regulation in portable instrumentation.
Availability
MAX667CPA is available at Aetrix Electronics and suitable for battery-powered instruments, solar-harvesting data loggers, and portable medical sensors requiring stable component supply with long-term lifecycle support and traceable sourcing.
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) designs precision analog, mixed-signal, and power-management ICs for demanding industrial, medical, and portable applications.
The MAX667CPA belongs to Maxim's micropower LDO regulator family, engineered specifically for battery-critical systems requiring extended runtime, intelligent power monitoring, and flexible output configuration without external complexity.
FAQ
What is the maximum input voltage rating for the MAX667CPA?
The MAX667CPA has an absolute maximum input supply voltage of +18V. Operation beyond this level risks permanent damage. The recommended operating range is +3.5V to +16.5V, as specified in the Electrical Characteristics table. Exceeding +16.5V may cause functional failure even if within the absolute maximum stress rating, and sustained operation near +18V degrades reliability. Always include input transient protection when interfacing with unregulated sources like batteries or solar panels.
How does the MAX667CPA achieve Dual Mode™ operation?
The MAX667CPA achieves Dual Mode™ operation by detecting the voltage at the SET pin: when SET is grounded, internal trimmed resistors set the output to +5V; when SET rises above 50mV, the error amplifier switches to accept feedback from an external resistor divider connected between OUT and GND. This allows seamless transition between minimal-component fixed output and precision-adjustable output (1.3V–16V) using the same MAX667CPA device, eliminating need for multiple SKUs.
Can the MAX667CPA be used with ceramic output capacitors?
The MAX667CPA is not guaranteed stable with low-ESR ceramic capacitors alone. Its PNP-based architecture requires minimum output-capacitor ESR (e.g., ≥0.5Ω at +25°C, rising with cooling per Figure 4) for phase margin. Aluminum electrolytics (10µF) typically meet this; ceramics require series resistance. Using a ceramic without added ESR risks oscillation and output ripple. For ceramic use, add a 0.5–2Ω resistor in series with the capacitor, sized per temperature requirements in Figure 4.
What is the function of the DD pin on the MAX667CPA?
The DD (Dropout Detector) pin on the MAX667CPA is an open-collector PNP output that begins sourcing current when the input-output differential falls below ~300mV. It provides early warning of impending regulation loss-well before VOUT collapses-enabling host systems to initiate graceful shutdown, data save, or alert signaling. Unlike LBO, DD responds to VIN–VOUT, not battery voltage, making it ideal for detecting end-of-life in any input source.
Does the MAX667CPA require an external capacitor on the LBI pin?
No, the MAX667CPA does not require an external capacitor on the LBI pin. LBI is a high-impedance CMOS input (leakage ≤10nA) designed for DC resistor-divider networks only. Adding capacitance introduces delay and hysteresis errors in low-battery detection timing. For clean threshold switching, connect LBI directly to a resistive divider from IN or VOUT; avoid bypass caps, filters, or long traces susceptible to leakage currents that could shift the 1.22V trip point.
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:
- 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):
- 0.35V @ 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.
MAX667CPA Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
