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Analog Devices Inc./Maxim Integrated MAX8667ETEAA+T
- Part No.:
- MAX8667ETEAA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
MAX8667ETEAA+T.pdf
- Description:
- IC REG QUAD BUCK/LNR SYNC 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,147
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Product details
Overview
MAX8667ETEAA+T from Maxim Integrated is a dual step-down DC-DC converter with dual integrated LDO regulators, designed to power low-voltage microprocessors and DSPs in portable electronics. It delivers guaranteed 600mA on OUT1 and 1200mA on OUT2, operates at 1.5MHz hysteretic-PWM switching, achieves 100µA no-load supply current with all outputs enabled, and supports input ranges of 2.8V–5.5V (IN12) and 1.7V–5.5V (IN34), enabling compact power management in smartphones and digital cameras.
For engineers reviewing the MAX8667ETEAA+T datasheet, MAX8667ETEAA+T pinout, MAX8667ETEAA+T application, or MAX8667ETEAA+T equivalent, key selection criteria include factory-preset output voltages (no external feedback required), individual enable inputs per regulator for flexible sequencing, thermal shutdown at +160°C, and compatibility with 2.2µH chip inductors and ceramic output capacitors - all within a space-constrained 3mm × 3mm thin QFN package.
Technical Context
The MAX8667ETEAA+T implements two independent step-down converters using a proprietary hysteretic-PWM control scheme operating at 1.5MHz, enabling ultra-small external components and fast transient response. Each buck stage integrates a p-channel high-side MOSFET and synchronous n-channel rectifier, eliminating external Schottky diodes and supporting peak current limits of 900mA (OUT1) and 1667mA (OUT2).
It integrates two low-noise, low-quiescent-current LDOs (OUT3/OUT4), each delivering up to 300mA with 75µVRMS output noise (100Hz–100kHz), 57dB PSRR below 1kHz, and dropout voltage as low as 130mV at 300mA load. All four regulators feature individual enable inputs (EN1–EN4), soft-start ramp time of 100µs (LDOs) and variable tPWRON/tEN timing, and operate across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.5MHz fixed-frequency hysteretic-PWM operation enables use of 2.2µH chip inductors and minimizes PCB area. |
| OUT1 Output Current | 600mA guaranteed minimum - sufficient for core logic rails of low-power microprocessors. |
| OUT2 Output Current | 1200mA guaranteed minimum - supports memory I/O or interface subsystems requiring higher current. |
| LDO Output Current | 300mA per LDO (OUT3/OUT4) - adequate for analog sensors, RF bias, or camera modules. |
| No-Load Supply Current | 100µA typical with all four regulators enabled - extends battery life in always-on portable standby modes. |
| Input Voltage Ranges | IN12: 2.8V–5.5V; IN34: 1.7V–5.5V - allows independent sourcing from main battery and auxiliary rail. |
| Thermal Shutdown | +160°C threshold with 15°C hysteresis - provides robust protection during sustained overload or poor heatsinking. |
Pinout & Package
The MAX8667ETEAA+T is housed in a 16-pin, 3mm × 3mm thin QFN package with exposed paddle (EP) that must be connected to GND, PGND1, PGND2, and system ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN3 | Enable input for LDO OUT3 | Active-high logic; drives high or ties to IN34 to activate regulator; reduces quiescent current when low. |
| 2 OUT3 | LDO output 3 | Factory-preset voltage output; requires 4.7µF ceramic bypass to GND; internally discharged via 1kΩ in shutdown. |
| 3 IN34 | Input supply for LDOs OUT3/OUT4 | 1.7V–5.5V range; must be ≤ VIN12; requires ≥4.7µF ceramic decoupling to GND. |
| 4 OUT4 | LDO output 4 | Factory-preset voltage output; same bypass and discharge behavior as OUT3. |
| 5 EN4 | Enable input for LDO OUT4 | Functionally identical to EN3; enables independent control of second LDO. |
| 6 GND | Analog/digital ground reference | Common return for internal bias circuits; separate from PGND1/PGND2 to minimize noise coupling. |
| 7 REF | Internal 0.6V reference output | Bypass with 0.01µF ceramic capacitor; used for precision feedback in adjustable variants (not applicable to MAX8667). |
| 8 FB2 / OUT2 | Feedback input for buck OUT2 | On MAX8667ETEAA+T: direct connection to OUT2 node (factory preset); not configurable via resistor divider. |
| 9 PGND2 | Power ground for buck OUT2 | High-current return path for LX2 switching loop; must be routed separately from AGND to avoid noise injection. |
| 10 LX2 | Switch node for buck OUT2 | Connects to inductor and synchronous rectifier; contains high dv/dt edges; requires tight layout with minimal trace length. |
| 11 IN12 | Input supply for bucks OUT1/OUT2 | 2.8V–5.5V range; must be ≥ VIN34; requires ≥10µF ceramic decoupling to PGND1/PGND2. |
| 12 LX1 | Switch node for buck OUT1 | Same layout-critical role as LX2; connects to 2.2µH inductor and internal MOSFET/rectifier pair. |
| 13 PGND1 | Power ground for buck OUT1 | Dedicated high-current return for LX1 loop; isolated from GND and PGND2 to preserve regulation accuracy. |
| 14 FB1 / OUT1 | Feedback input for buck OUT1 | On MAX8667ETEAA+T: direct connection to OUT1 node (factory preset); no external resistor network needed. |
| 15 EN1 | Enable input for buck OUT1 | Active-high; ties to IN12 or driven externally; initiates soft-start with tPWRON delay on first assertion. |
| 16 EN2 | Enable input for buck OUT2 | Independent control of second buck; supports staggered or simultaneous power-up sequencing. |
| EP | Exposed thermal paddle | Must be soldered to solid GND plane; primary thermal path for heat dissipation (1667mW max at +70°C). |
Key Features
| Feature | Design Value |
|---|---|
| Factory-preset output voltages | Eliminates external feedback resistors for OUT1/OUT2 - reduces BOM count, layout complexity, and calibration risk. |
| Individual enable inputs (EN1–EN4) | Enables precise power sequencing across four rails - critical for FPGA, SoC, or multi-core processor startup compliance. |
| 1.5MHz hysteretic-PWM architecture | Permits use of tiny 2.2µH chip inductors and small ceramic capacitors - saves >30% board area vs. lower-frequency alternatives. |
| Synchronous rectification | Removes need for external Schottky diodes - improves light-load efficiency and simplifies thermal design. |
| Low-noise LDOs (75µVRMS) | Meets stringent noise requirements for RF front-ends, image sensors, and audio codecs without additional filtering. |
| Ultra-low no-load current (100µA) | Extends battery runtime in sleep modes where only real-time clock or sensor monitoring remains active. |
Applications
| Smartphone Application | Digital Camera Application |
|---|---|
Use Scenario: Powering application processor core (VDD_CORE), I/O (VDD_IO), image sensor bias (AVDD), and flash LED driver in a single-board smartphone design. IC Role / Device Role / Timing Role: MAX8667ETEAA+T supplies four independent regulated rails: OUT1 (1.2V/600mA) for CPU core, OUT2 (1.8V/1200mA) for DDR I/O, OUT3 (2.8V/300mA) for CMOS sensor analog rail, and OUT4 (2.8V/300mA) for flash LED bias. Use Value: Factory-preset outputs eliminate trimming effort; individual EN pins allow boot-order control matching SoC requirements; 100µA quiescent current preserves standby battery life. | Use Scenario: Providing stable, low-noise power to CCD/CMOS image sensor, ISP, autofocus motor driver, and LCD backlight controller in compact digital cameras. IC Role / Device Role / Timing Role: MAX8667ETEAA+T delivers OUT1 (1.2V) for ISP core, OUT2 (1.8V) for sensor digital interface, OUT3 (2.8V) for sensor analog supply, and OUT4 (3.3V) for backlight LED driver - all with <75µVRMS noise. Use Value: Low-output-noise LDOs prevent image banding or color artifacts; 1.5MHz switching avoids interference in visible spectrum; thermal shutdown protects against lens-motor stall overcurrent. |
| PDA / Palmtop Computer | Portable MP3 Player |
Use Scenario: Consolidating power delivery for ARM-based application processor, NAND flash, touchscreen controller, and Wi-Fi/BT combo module in legacy PDA platforms. IC Role / Device Role / Timing Role: MAX8667ETEAA+T generates VDD_ARM (1.3V), VDD_SDRAM (1.8V), AVDD_TOUCH (2.8V), and VDD_WLAN (3.3V) with independent enable sequencing to meet reset timing constraints. Use Value: Four-rail integration reduces component count vs. discrete regulators; thin QFN footprint fits narrow PCB margins; -40°C to +85°C rating ensures outdoor usability. | Use Scenario: Powering audio DAC, headphone amplifier, flash memory, and OLED display in battery-powered MP3 players with <10mm thickness. IC Role / Device Role / Timing Role: MAX8667ETEAA+T supplies VDD_DAC (1.2V), VDD_AMP (1.8V), VDD_NAND (2.8V), and VDD_OLED (3.3V), with EN1–EN4 timed to mute audio during power-up. Use Value: 75µVRMS LDO noise prevents audible hiss in headphones; 100µA no-load current extends playback time between charges; 3mm × 3mm package enables ultra-thin mechanical design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck + dual-LDO power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8668ETEAA+ | Adjustable output voltages (0.6V–3.3V) via FB1/FB2 resistor dividers; same pinout and package; higher IN12 min voltage (2.6V vs. 2.8V). | Required when system needs programmable or nonstandard output voltages; not drop-in for MAX8667ETEAA+T due to different feedback configuration. | Select MAX8668ETEAA+ only if voltage flexibility outweighs added BOM cost and layout complexity of external resistors. |
| TPS65023RGZR | Triple buck + dual LDO; 2.25V–5.5V input; 600mA/600mA/600mA buck outputs; different pinout; no factory-preset option - all outputs adjustable. | Used in systems needing three independent high-current rails; lacks direct pin compatibility and requires full layout redesign. | Choose TPS65023RGZR only when third buck rail is mandatory and sequencing flexibility justifies redesign effort. |
Compared with MAX8668ETEAA+, the MAX8667ETEAA+T offers simpler implementation with factory-preset outputs but less voltage flexibility; compared with TPS65023RGZR, it provides tighter integration for dual-buck systems with lower component count and smaller footprint, though lacking a third buck channel.
Availability
MAX8667ETEAA+T is available at Aetrix Electronics and suitable for smartphone power management, digital camera sensor biasing, PDA processor core regulation, portable audio DAC supply, and handheld instrument analog rail generation requiring stable component supply across industrial temperature ranges.
Supply support for MAX8667ETEAA+T 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 portable, industrial, and communications applications.
The MAX8667/MAX8668 product line was designed specifically for space-constrained portable devices requiring highly integrated, low-quiescent-current, multi-rail power solutions with factory-configured outputs to accelerate time-to-market.
FAQ
What output voltages does the MAX8667ETEAA+T provide?
The MAX8667ETEAA+T features factory-preset output voltages: OUT1 and OUT2 are fixed (e.g., 1.2V and 1.8V per selector guide), while OUT3 and OUT4 are also preset (e.g., 2.8V each). No external feedback resistors are required - the MAX8667ETEAA+T is configured at wafer level, ensuring consistent performance without user adjustment.
Does the MAX8667ETEAA+T require external feedback resistors for OUT1 and OUT2?
No, the MAX8667ETEAA+T does not require external feedback resistors for OUT1 and OUT2. These outputs are factory-preset, and pins FB1 and FB2 are internally connected to their respective output nodes. External resistor networks are only used on the MAX8668 variant - attempting to add them to MAX8667ETEAA+T will not alter output voltage and may impair regulation.
What is the maximum allowable input voltage for IN12 and IN34 on the MAX8667ETEAA+T?
The MAX8667ETEAA+T supports IN12 up to 5.5V (minimum 2.8V) and IN34 up to 5.5V (minimum 1.7V). Critically, VIN34 must not exceed VIN12 - violating this constraint risks damage or improper LDO regulation. Absolute maximum ratings limit both inputs to +6.0V relative to GND, but operation above 5.5V is not guaranteed.
How does thermal protection operate on the MAX8667ETEAA+T?
The MAX8667ETEAA+T activates thermal shutdown at +160°C junction temperature, disabling all regulators until die temperature falls by 15°C (to ~+145°C), then automatically recovers. This hiccup-mode protection prevents permanent damage during sustained overload or inadequate PCB copper area, and is independent of ambient temperature or airflow conditions.
Can the MAX8667ETEAA+T be used with ceramic output capacitors only?
Yes, the MAX8667ETEAA+T is fully compatible with ceramic output capacitors: 4.7µF for each LDO (OUT3/OUT4), 2.2µF for each buck output (OUT1/OUT2), and 10µF on IN12. Its hysteretic-PWM control and internal compensation are optimized for low-ESR ceramics - no tantalum or electrolytic capacitors are needed, reducing size, cost, and failure risk.
MAX8667ETEAA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Topology:
- Step-Down (Buck) Synchronous (2), Linear (LDO) (2)
- Number of Outputs:
- 4
- Frequency - Switching:
- 1.5MHz
- Voltage/Current - Output 1:
- 1.2V, 600mA
- Voltage/Current - Output 2:
- 1.8V, 1.2A
- Voltage/Current - Output 3:
- 2.8V, 300mA
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 2.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (3x3)
MAX8667ETEAA+T FAQ
1.How can I place an order for MAX8667ETEAA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8667ETEAA+T 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 MAX8667ETEAA+T reliable?
The price and inventory of MAX8667ETEAA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8667ETEAA+T is usually 5 days.
3.What payment methods are accepted for MAX8667ETEAA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8667ETEAA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8667ETEAA+T?
MAX8667ETEAA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8667ETEAA+T 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 MAX8667ETEAA+T?
For technical support, including MAX8667ETEAA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8667ETEAA+T requirements.
6.How does Aetrix verify that MAX8667ETEAA+T is sourced from the original manufacturer or authorized distributors?
All MAX8667ETEAA+T 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 MAX8667ETEAA+T meets industry standards.
7.What is the process for return or replacement of MAX8667ETEAA+T?
All MAX8667ETEAA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8667ETEAA+T, 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 MAX8667ETEAA+T part is unused and in its original packaging.
Return procedure for MAX8667ETEAA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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