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Analog Devices Inc./Maxim Integrated MAX689CPA
- Part No.:
- MAX689CPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX689CPA.pdf
- Description:
- IC REG LINEAR 3V 1A 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,826
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Product details
Overview
The MAX689CPA from Maxim Integrated is a precision 3.0V fixed-output, low-dropout linear regulator requiring an external PNP pass transistor; it delivers up to 1A output current with 40mV dropout at 200mA (FZT749), features active-low shutdown control (SHDN), power-fail monitoring (PFO), and operates from 2.7V to 11.0V input; used in battery-powered portable telephones and memory backup supplies.
For engineers reviewing the MAX689CPA datasheet, MAX689CPA pinout, MAX689CPA application, or MAX689CPA equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternative parts with functional distinctions, and supply-chain support for industrial and OEM deployment.
Technical Context
The MAX689CPA implements a precision bandgap reference and high-gain error amplifier to regulate 3.0V output with ±2% accuracy over temperature and load; its base-drive circuit delivers ≥10mA to drive high-β PNP transistors (e.g., FZT749) while limiting base current via an external resistor between BASE and BLIM pins.
It integrates dual comparators: one monitors VOUT for PFO assertion at 2.85V (170mV below nominal), and another controls SHDN thresholds-entering standby (<25µA) at 1.2V and full shutdown (<1µA) at 0.2V-with 70mV hysteresis to prevent chatter during transition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0V, ±2% accuracy over 0°C to +70°C ensures stable logic supply for microcontrollers and SRAM. |
| Dropout Voltage | 40mV at 200mA (FZT749), enabling regulation down to VIN = 3.04V-critical for extending battery life in single-cell Li-ion or alkaline systems. |
| Supply Current | 150µA operating, <1µA in shutdown-minimizes quiescent drain on backup batteries during long-term storage. |
| Input Voltage Range | 2.7V to 11.0V supports wide-input applications including multi-cell battery packs and unregulated wall adapters. |
| PFO Threshold | Trips at 2.85V (170mV below 3.0V), providing early warning before brownout-enables orderly system shutdown or data save. |
| SHDN Thresholds | Standby entry at 1.2V ±2%, full shutdown at 0.2V-allows precise, resistor-divider–based power sequencing without external logic. |
| Base Drive Capability | ≥10mA sink current at BASE pin enables >1A output with β > 100 PNP transistors like FZT749 or 2N2907A. |
Pinout & Package
MAX689CPA uses an 8-pin plastic DIP package (0.300" width), RoHS-compliant, with through-hole mounting and industry-standard footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Positive input supply | Accepts 2.7V–11.0V; bypass capacitor (C1) must connect directly between IN and GND for stability. |
| 2 SHDN | Active-low shutdown control | Pulls low to enter standby (<25µA) then shutdown (<1µA); open or tie to IN if unused. |
| 3 PFO | Power-fail open-drain output | Sinks current when VOUT ≤ 2.85V; requires external pull-up for logic-level signaling to µC or supervisor IC. |
| 4 GND | Analog and power ground | Common return for IN, OUT, CC, and external PNP emitter; must be low-impedance star point. |
| 5 OUT | Regulated 3.0V output | Drives external PNP collector; output capacitor (C2 ≥10µF) required for transient stability and ESR <1% of load R. |
| 6 BLIM | Base-current limit sense | Connects via resistor RB to BASE to set max IBASE = 0.1V/(RB + 5Ω); limits output current and dropout rise. |
| 7 BASE | PNP transistor base driver | Sinks ≥10mA to drive external PNP; shorted to BLIM for max base drive (≈20mA nominal). |
| 8 CC | Compensation node | Connects 10nF non-polarized capacitor to GND; stabilizes loop response and suppresses startup overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.0V output | Guaranteed 2.85V–3.15V over full temp/load range-meets tight tolerance requirements for 3V logic and memory interfaces. |
| External PNP drive | Direct base control eliminates need for driver stages, reducing BOM count and PCB area in high-current (>500mA) designs. |
| Programmable base current limit | RB resistor sets precise output current limit without sacrificing dropout voltage-enables safe operation under overload or short-circuit. |
| Low-noise PFO comparator | 100µs glitch immunity and 7mV hysteresis prevent false triggers from line/load transients-ensures reliable power-fail detection. |
| Three-level SHDN interface | Enables seamless power sequencing: ON → standby → shutdown with defined thresholds-supports controlled wake/sleep transitions. |
Applications
| Portable Telephones | Battery-Powered Instruments |
|---|---|
Use Scenario: Power management in GSM/CDMA handsets with single-cell Li-ion (3.0–4.2V) input. IC Role / Device Role / Timing Role: Primary 3.0V LDO for RF transceiver and baseband processor core supply. Use Value: 40mV dropout extends usable battery range by ~150mV, delaying brownout shutdown and preserving call continuity. |
Use Scenario: Portable multimeter or handheld oscilloscope powered by AA/AAA alkaline cells. IC Role / Device Role / Timing Role: Stable 3.0V rail for ADC reference, display controller, and microcontroller I/O. Use Value: ±2% output accuracy ensures measurement repeatability; <1µA shutdown current prevents battery depletion during storage. |
| Memory Backup Supply | Industrial Sensor Node |
Use Scenario: Maintaining SRAM or real-time clock (RTC) during main power loss in embedded controllers. IC Role / Device Role / Timing Role: Low-quiescent 3.0V regulator fed from coin cell or supercapacitor backup source. Use Value: 150µA operating current and PFO alert at 2.85V enable deterministic data save before VOUT collapse. |
Use Scenario: Wireless sensor node powered by energy harvesting or long-life primary battery. IC Role / Device Role / Timing Role: Main 3.0V supply for ultra-low-power MCU, BLE radio, and analog front-end. Use Value: SHDN threshold control allows synchronized sleep/wake with system controller; 2.7V min input supports depleted battery operation. |
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 |
|---|---|---|---|
| MAX688CPA | Identical pinout and SHDN/PFO functionality, but 3.3V output instead of 3.0V. | Used where 3.3V logic compatibility is required (e.g., SPI peripherals, 3.3V microcontrollers). | Select MAX688CPA only when system voltage rails mandate 3.3V; not interchangeable without board-level redesign. |
| LT1528CN8#PBF | 3.3V fixed output, integrated PNP pass device, no external transistor needed; higher quiescent current (1.2mA vs. 150µA). | Preferred for space-constrained designs where external transistor layout is impractical. | Choose LT1528CN8#PBF for simplified layout and faster time-to-market; avoid when ultra-low IQ or >1A output is required. |
Compared with MAX689CPA, MAX688CPA offers identical control architecture but targets 3.3V systems, while LT1528CN8#PBF trades external transistor flexibility and ultra-low IQ for integration-making MAX689CPA optimal for cost-sensitive, high-efficiency, high-current battery applications demanding 3.0V.
Availability
MAX689CPA is available at Aetrix Electronics and suitable for portable telephones, memory backup supplies, and battery-powered instrumentation requiring stable component supply across extended production lifecycles.
Supply support for MAX689CPA 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 and mixed-signal ICs for power management, sensing, and communication applications.
The MAX687/MAX688/MAX689 family was engineered specifically for high-accuracy, low-dropout regulation in battery-critical systems-emphasizing ultra-low IQ, programmable current limiting, and robust power-fail signaling.
FAQ
What is the maximum output current supported by the MAX689CPA?
The MAX689CPA itself does not deliver output current directly-it drives an external PNP transistor. With a high-β device like the FZT749 (β > 100), the MAX689CPA enables >1A output. The actual limit depends on the PNP's hFE, thermal design, and base-current-limiting resistor (RB); for example, RB = 12Ω yields ~6mA base current, supporting ~600mA with β = 100.
Does the MAX689CPA have automatic shutdown like the MAX687CPA?
No, the MAX689CPA does not feature automatic latched shutdown. Unlike the MAX687CPA-which shuts down when VOUT falls below 2.96V-the MAX689CPA relies solely on the active-low SHDN pin for output control. It enters standby mode below 1.2V on SHDN and full shutdown below 0.2V, with no internal voltage-monitoring latch.
What external components are mandatory for stable operation of the MAX689CPA?
Four external components are mandatory: (1) an external PNP pass transistor (e.g., FZT749), (2) a bypass capacitor (C1 ≥ 0.33µF) from IN to GND, (3) an output capacitor (C2 ≥ 10µF, low-ESR) from OUT to GND, and (4) a compensation capacitor (C3 = 10nF) from CC to GND. RB resistor between BASE and BLIM is required only if base-current limiting is needed.
Can the MAX689CPA be used with a 2.5V input supply?
No, the MAX689CPA requires a minimum input voltage of 2.7V to maintain regulation. At 2.5V input, the internal reference and comparators may remain functional, but the output will fall out of regulation-especially under load-since dropout voltage adds to the 3.0V output requirement (e.g., 3.0V + 40mV = 3.04V min VIN at 200mA).
How does the PFO pin behave during shutdown on the MAX689CPA?
During shutdown (SHDN < 0.2V), the PFO pin on the MAX689CPA is forced low and sinks current regardless of the actual VOUT level. This behavior provides a reliable "power fail" signal to host systems even when the regulator is disabled-enabling coordinated system-level power-down sequences without additional supervision logic.
MAX689CPA 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:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 11V
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.04V @ 200mA (Typ)
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 25 µA
- Current - Supply (Max):
- 250 µA
- PSRR:
- -
- Control Features:
- Current Limit, Enable, Power Fail
- Protection Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX689CPA FAQ
1.How can I place an order for MAX689CPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX689CPA 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 MAX689CPA reliable?
The price and inventory of MAX689CPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX689CPA is usually 5 days.
3.What payment methods are accepted for MAX689CPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX689CPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX689CPA?
MAX689CPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX689CPA 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 MAX689CPA?
For technical support, including MAX689CPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX689CPA requirements.
6.How does Aetrix verify that MAX689CPA is sourced from the original manufacturer or authorized distributors?
All MAX689CPA 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 MAX689CPA meets industry standards.
7.What is the process for return or replacement of MAX689CPA?
All MAX689CPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX689CPA, 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 MAX689CPA part is unused and in its original packaging.
Return procedure for MAX689CPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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