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Analog Devices Inc./Maxim Integrated MAX667EPA+
- Part No.:
- MAX667EPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX667EPA+.pdf
- Description:
- IC REG LIN POS ADJ 250MA 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:342
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Product details
Overview
The MAX667EPA+ 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 (LBO), shutdown control (SHDN), and dropout detector (DD), making it suitable for battery-powered instrumentation and portable radios.
For engineers reviewing the MAX667EPA+ datasheet, MAX667EPA+ pinout, MAX667EPA+ application, or MAX667EPA+ equivalent, key selection considerations include its -40°C to +85°C operating temperature range, 8-pin plastic DIP package, 350mV max dropout at 200mA, dual-mode output configuration, and integrated power-fail warning functions.
Technical Context
The MAX667EPA+ employs a micropower PNP pass transistor architecture with a trimmed 1.22V bandgap reference and error amplifier. Its Dual Mode™ operation switches between internal fixed 5V feedback (SET grounded) and external resistor-programmed output (SET >50mV), enabling minimal-component or precision-adjustable designs.
It integrates three monitoring comparators: one for low-battery detection (LBI/LBO), one for early-warning dropout detection (DD), and one for SET mode selection. All logic inputs (SHDN, LBI, SET) are CMOS-compatible with sub-10nA leakage, and LBO/DD outputs are open-drain N-channel and PNP-collector, respectively.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 250mA maximum - supports moderate-power microcontrollers and analog sensors without external boosting. |
| Dropout Voltage | 150mV typical at 200mA - enables regulation down to VIN = VOUT + 0.15V, extending usable battery life. |
| 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 Options | Fixed +5V (SET = GND) or adjustable 1.3V–16V (external R1/R2) - eliminates need for separate regulators across product variants. |
| Operating Temperature | -40°C to +85°C - qualified for industrial and extended-temperature portable equipment. |
| Low-Battery Threshold | 1.225V ±25mV reference - allows precise end-of-life battery detection via external divider on LBI pin. |
Pinout & Package
The MAX667EPA+ is housed in an 8-pin plastic DIP package (0.300" wide), rated for -40°C to +85°C operation and compatible with through-hole assembly and manual prototyping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - DD | Dropout Detector Output | PNP collector open-circuit output that sources current when VIN–VOUT falls below ~300mV - provides early warning of regulation loss. |
| 2 - OUT | Regulated Output | Main power output; requires ≥10µF capacitor to ground for stability; drops to 0V when SHDN is high. |
| 3 - LBI | Low-Battery Input | CMOS comparator input referenced to 1.225V; accepts resistive divider to set custom battery threshold (e.g., 5.5V with 8.2MΩ/2.4MΩ). |
| 4 - GND | Ground Reference | Analog and power ground common point; must be low-impedance return path for OUT, LBO, and DD loads. |
| 5 - SHDN | Shutdown Control | CMOS input; <1.5V enables regulation, >1.5V disables OUT/LBO/DD and reduces IQ to <1µA. |
| 6 - SET | Output Voltage Select | CMOS input; grounded for fixed +5V; >50mV enables external resistor divider for programmable output (VOUT = 1.22V × (R1+R2)/R1). |
| 7 - LBO | Low-Battery Output | Open-drain N-channel output sinking current when LBI < 1.225V - requires external pull-up (e.g., to OUT) for logic-level signaling. |
| 8 - IN | Unregulated Input | Positive supply input; must be ≥3.5V and ≤18V absolute max; powers internal circuitry and pass transistor base. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ Output Configuration | Single IC supports both fixed +5V (zero external components) and adjustable 1.3V–16V (two resistors), reducing BOM count across design variants. |
| Integrated Dropout Detector (DD) | Provides analog warning signal before regulation loss - enables graceful system shutdown or display alert without external comparators. |
| Sub-1µA Shutdown Quiescent Current | Reduces standby power to negligible levels (<0.2µA typ), essential for long-duration battery backup and sleep-mode operation. |
| Low-Battery Detection with Programmable Threshold | LBI input and LBO output allow user-defined voltage thresholds (e.g., 4.2V for Li-ion, 3.3V for alkaline) using high-value resistors to minimize loading. |
| Stable with Standard 10µF Output Capacitor | Guaranteed stability with inexpensive aluminum electrolytic capacitors - no need for low-ESR specialty parts unless extreme transient response is required. |
Applications
| Pager Power Management | Radio Control Receiver |
|---|---|
Use Scenario: Compact handheld pager requiring reliable +5V rail from two AA batteries over full discharge cycle. IC Role / Device Role / Timing Role: Primary voltage regulator and battery-end-of-life monitor. Use Value: 150mV dropout extends usable battery life by ~15% vs. standard LDOs; LBO triggers display blanking before brownout. |
Use Scenario: 27MHz/40MHz RC receiver module powered by 9V alkaline battery with intermittent duty cycle. IC Role / Device Role / Timing Role: Low-noise, low-quiescent-current regulator with shutdown during idle periods. Use Value: 20µA quiescent current prevents battery drain during standby; SHDN enables microcontroller-controlled power gating. |
| Portable Data Logger | Solar-Powered Sensor Node |
Use Scenario: Field-deployed environmental logger using CR2032 coin cell for multi-month operation. IC Role / Device Role / Timing Role: Precision +5V source with programmable low-battery flag for data integrity preservation. Use Value: Adjustable output allows direct 3.3V MCU supply; LBI threshold set to 2.7V ensures memory write completion before shutdown. |
Use Scenario: Outdoor solar-charged sensor node with supercapacitor buffer and variable input (3V–12V). IC Role / Device Role / Timing Role: Wide-input LDO regulator with dropout warning to trigger energy-saving mode before storage depletion. Use Value: 3.5V–16.5V input range accepts unregulated solar panel output; DD output drives comparator to initiate sleep at 4.1V VIN–VOUT. |
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 |
|---|---|---|---|
| MAX667CPA+ | Same electrical specs but 0°C to +70°C temperature range; identical pinout and functionality. | Not suitable for industrial environments or outdoor deployments requiring extended temperature tolerance. | Select MAX667CPA+ only for commercial-grade indoor applications where cost is prioritized over thermal margin. |
| LT1121CS8-5#PBF | Fixed +5V output only; 130mV dropout at 150mA; 50µA quiescent current; no LBO/DD/SHDN monitoring features. | Lacks integrated battery monitoring and shutdown control - requires external circuitry for equivalent functionality. | Choose LT1121CS8-5#PBF when only basic +5V regulation is needed and board space permits discrete monitoring components. |
Compared with MAX667CPA+, the MAX667EPA+ adds industrial temperature support without trade-offs in performance or footprint; compared with LT1121CS8-5#PBF, it delivers integrated power management features at the cost of slightly higher quiescent current, simplifying system-level design for battery-constrained applications.
Availability
The MAX667EPA+ is available at Aetrix Electronics and suitable for battery-powered devices, portable instruments, and solar-powered instruments requiring stable component supply across industrial temperature ranges.
Supply support for MAX667EPA+ 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 demanding applications.
The MAX667EPA+ belongs to Maxim's micropower linear regulator family, designed specifically for ultra-low-power, battery-operated systems requiring accurate voltage regulation and intelligent power monitoring.
FAQ
What is the maximum input voltage rating for the MAX667EPA+?
The MAX667EPA+ has an absolute maximum input voltage rating of +18V. Operation above +16.5V is not recommended per specifications, and sustained exposure beyond +18V may cause permanent damage. The device is designed for input ranges from +3.5V to +16.5V under normal conditions, making it suitable for multi-cell battery packs and intermediate supply rails. Always observe derating guidelines for power dissipation at elevated temperatures.
How does the MAX667EPA+ achieve Dual Mode™ operation?
The MAX667EPA+ achieves Dual Mode™ operation via the SET pin: when grounded, internal trimmed resistors configure the feedback network for a fixed +5V output; when biased above 50mV, the error amplifier switches to accept an external voltage divider (R1/R2) connected between OUT and GND, enabling programmable output from +1.3V to +16V. This eliminates the need for separate fixed- and adjustable-output regulators in product families.
Can the MAX667EPA+ be used with ceramic output capacitors?
The MAX667EPA+ is not optimized for low-ESR ceramic capacitors. Its stability relies on sufficient output-capacitor ESR (≥1Ω at +25°C, increasing with lower temperature per Figure 4). Using ceramic capacitors without series resistance risks oscillation. For ceramic-based designs, add a resistor (e.g., 1–5Ω) in series with the capacitor to meet minimum ESR requirements, or select a tantalum or aluminum-electrolytic capacitor with inherent ESR.
What is the function of the DD pin on the MAX667EPA+?
The DD (Dropout Detector) pin on the MAX667EPA+ is the collector of an internal PNP transistor that begins sourcing current when the input-output differential falls below ~300mV. This provides an analog early-warning signal of impending regulation loss - unlike binary flags, DD's current ramp allows predictive system response (e.g., initiating low-power mode before brownout). A 100kΩ pull-down resistor converts DD current into a measurable voltage.
Does the MAX667EPA+ require an external capacitor on the LBI pin?
No, the MAX667EPA+ does not require an external capacitor on the LBI pin. LBI is a high-impedance CMOS input (leakage <10nA) intended for connection to a resistive voltage divider from the battery or supply rail. Adding capacitance would slow response time and is unnecessary for stable low-battery detection. If noise immunity is critical, a small RF capacitor (e.g., 100pF) may be added, but it is not specified or required in the MAX667EPA+ design.
MAX667EPA+ 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX667EPA+ FAQ
1.How can I place an order for MAX667EPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX667EPA+ 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 MAX667EPA+ reliable?
The price and inventory of MAX667EPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX667EPA+ is usually 5 days.
3.What payment methods are accepted for MAX667EPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX667EPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX667EPA+?
MAX667EPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX667EPA+ 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 MAX667EPA+?
For technical support, including MAX667EPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX667EPA+ requirements.
6.How does Aetrix verify that MAX667EPA+ is sourced from the original manufacturer or authorized distributors?
All MAX667EPA+ 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 MAX667EPA+ meets industry standards.
7.What is the process for return or replacement of MAX667EPA+?
All MAX667EPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX667EPA+, 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 MAX667EPA+ part is unused and in its original packaging.
Return procedure for MAX667EPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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