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Analog Devices Inc./Maxim Integrated MAX8667ETECQ+T
- Part No.:
- MAX8667ETECQ+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
MAX8667ETECQ+T.pdf
- Description:
- IC REG QUAD BUCK/LNR SYNC 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,771
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Product details
Overview
MAX8667ETECQ+T from Maxim Integrated is a dual step-down DC-DC converter with dual low-noise LDO regulators in a single 16-pin thin QFN (3mm × 3mm) package. It delivers guaranteed 600mA on OUT1 and 1200mA on OUT2, with factory-preset output voltages, and supports 1.7V–5.5V LDO input and 2.8V–5.5V buck input. Designed for portable microprocessor/DSP power rails, it enables precise sequencing in smartphones and digital cameras.
For engineers reviewing the MAX8667ETECQ+T datasheet, MAX8667ETECQ+T pinout, MAX8667ETECQ+T application, or MAX8667ETECQ+T equivalent, key selection criteria include guaranteed output current per rail, individual enable control per regulator, ultra-low no-load supply current (100µA typ with all outputs enabled), LDO dropout voltage at 300mA (≤250mV), and hysteretic-PWM switching at 1.5MHz for minimal external component count.
Technical Context
The MAX8667ETECQ+T integrates two independent hysteretic-PWM step-down converters (OUT1/OUT2) and two low-quiescent-current LDOs (OUT3/OUT4), each with dedicated enable inputs (EN1–EN4) enabling flexible power sequencing. Its architecture uses internal p-channel MOSFET switches and synchronous rectifiers-no external Schottky diodes required-and features voltage positioning via FB1/FB2 feedback to reduce transient-induced output deviation.
It implements separate undervoltage lockout thresholds: 2.5V (typ) for IN12 (buck supplies) and 1.6V (typ) for IN34 (LDO supplies), plus thermal shutdown at +160°C with 15°C hysteresis. The 1.5MHz fixed-frequency operation allows use of tiny 2.2µH chip inductors and reduces EMI sensitivity compared to variable-frequency alternatives.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Configuration | Dual adjustable/factory-preset buck (OUT1/OUT2) + dual fixed LDO (OUT3/OUT4) |
| OUT1 Guaranteed Current | 600mA - sufficient for core logic or memory I/O rails in portable SoCs |
| OUT2 Guaranteed Current | 1200mA - supports high-current peripherals like display drivers or RF transceivers |
| No-Load Supply Current | 100µA (typ) with all four regulators enabled - extends battery life in standby mode |
| LDO Dropout Voltage | 250mV max at 300mA load - enables operation from low-input sources such as single-cell Li-ion (3.0V min) |
| Switching Frequency | 1.5MHz - permits compact 2.2µH inductors and reduces output capacitor requirements |
| Operating Temperature | −40°C to +85°C - qualified for industrial and consumer portable equipment environments |
Pinout & Package
MAX8667ETECQ+T is housed in a 16-pin, 3mm × 3mm thin QFN package with exposed paddle (EP) that must be connected to GND/PGND for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (EN3) | LDO3 enable input | Active-high logic; drives high or ties to IN34 to activate OUT3; pulls low to disable and reduce quiescent current |
| 2 (OUT3) | LDO3 regulated output | Fixed-output LDO delivering up to 300mA; requires 4.7µF ceramic bypass to GND |
| 3 (IN34) | LDO input supply | Shared 1.7V–5.5V input for both LDOs; must be ≤ VIN12; bypassed with ≥4.7µF ceramic capacitor |
| 4 (OUT4) | LDO4 regulated output | Fixed-output LDO delivering up to 300mA; requires 4.7µF ceramic bypass to GND |
| 5 (EN4) | LDO4 enable input | Active-high logic; identical behavior to EN3 for independent LDO control |
| 6 (GND) | Analog ground reference | Signal return for REF, FB1/FB2, and logic inputs; must be tied to PGND1/PGND2 and EP |
| 7 (REF) | Internal 0.6V reference output | Bypassed with 0.01µF ceramic cap; used for precision feedback and external monitoring |
| 8 (OUT2 / FB2) | Regulator 2 feedback node | On MAX8667ETECQ+T: direct connection to OUT2 (factory preset); not configurable |
| 9 (PGND2) | Power ground for buck 2 | High-current return path for LX2; must be low-inductance connection to EP/GND |
| 10 (LX2) | Switch node for buck 2 | Connects to inductor and sync rectifier; internal clamp diodes to GND and IN12 limit voltage swing |
| 11 (IN12) | Buck input supply | 2.8V–5.5V shared input for both step-down regulators; bypassed with ≥10µF ceramic capacitor |
| 12 (LX1) | Switch node for buck 1 | Connects to inductor and sync rectifier; same clamping behavior as LX2 |
| 13 (PGND1) | Power ground for buck 1 | High-current return path for LX1; must be low-inductance connection to EP/GND |
| 14 (OUT1 / FB1) | Regulator 1 feedback node | On MAX8667ETECQ+T: direct connection to OUT1 (factory preset); not configurable |
| 15 (EN1) | Buck 1 enable input | Active-high logic; ties to IN12 to enable OUT1; pulls low to shut down and reduce input current |
| 16 (EN2) | Buck 2 enable input | Active-high logic; identical behavior to EN1 for independent buck control |
| EP | Exposed thermal paddle | Must be soldered to PCB ground plane for thermal dissipation and noise reduction |
Key Features
| Feature | Design Value |
|---|---|
| Individual enable inputs per regulator | EN1–EN4 allow full control over startup/shutdown sequencing - critical for SoC power integrity and avoiding backfeed |
| Hysteretic-PWM control at 1.5MHz | Enables use of 2.2µH inductors and minimizes external component footprint without sacrificing transient response |
| Synchronous rectification | Eliminates need for external Schottky diodes - improves efficiency and reduces BOM cost and layout area |
| Low-noise LDOs with 75µVRMS output noise | Meets stringent analog/RF supply requirements in camera modules and audio codecs without additional filtering |
| Voltage positioning support (via FB pins) | Reduces peak-to-peak output deviation during load transients - lowers required output capacitance by up to 30% |
| Thermal shutdown with hysteresis | +160°C trip with 15°C hysteresis prevents latch-up and enables safe recovery under overload conditions |
Applications
| Smartphone Application | Digital Camera Power System |
|---|---|
|
Use Scenario: Powers application processor core (VDD_CORE), I/O (VDD_IO), image sensor bias (AVDD), and memory interface (VDDQ) in compact smartphone designs. IC Role / Device Role / Timing Role: Primary multi-rail PMIC delivering factory-set voltages with independent sequencing via EN1–EN4 to meet SoC boot timing requirements. Use Value: Eliminates need for four discrete regulators - saves >25mm² PCB area and reduces bill-of-materials count by 60% versus discrete solution. |
Use Scenario: Supplies CMOS image sensor (1.2V), ISP core (1.8V), analog front-end (2.8V), and flash LED driver (2.8V) in DSLR and mirrorless camera bodies. IC Role / Device Role / Timing Role: Dual-buck + dual-LDO configuration provides clean, sequenced rails where low noise (75µVRMS) preserves image SNR and fast load transient response avoids frame corruption. Use Value: 100µA no-load current extends battery runtime in standby; 1.5MHz switching avoids interference with image sensor readout clock (typically <1MHz). |
| Portable Medical Monitor | Handheld Industrial Scanner |
|
Use Scenario: Powers ARM Cortex-M7 MCU (1.2V), ADC reference (2.8V), OLED display controller (1.8V), and biometric sensor interface (2.8V) in FDA-class portable diagnostics devices. IC Role / Device Role / Timing Role: Regulator 1 (600mA) supplies MCU core; Regulator 2 (1200mA) powers display; LDOs provide low-noise analog rails for precision measurement circuitry. Use Value: −40°C to +85°C rating ensures reliability in field-deployed units; 0.6V reference (REF pin) enables accurate calibration of ADC reference without external components. |
Use Scenario: Delivers power to laser diode driver (2.8V), barcode imager (1.8V), Bluetooth SoC (1.2V), and EEPROM (2.8V) in ruggedized handheld scanners used in warehouses and logistics. IC Role / Device Role / Timing Role: EN1–EN4 enable controlled ramp-up: laser driver first (to avoid optical surge), then imager, then comms - preventing brownout during simultaneous activation. Use Value: 250mV LDO dropout allows stable 2.8V output from aging 3.3V Li-ion cells; thermal shutdown protects against overheating in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65023RSBR | Triple buck + dual LDO; 3MHz switching; 1.2V/1.8V/2.8V factory-set; no voltage positioning; higher quiescent current (250µA) | Targeted at OMAP3-based systems; lacks individual EN control for LDOs; wider input range (2.5V–6.5V) | Choose when higher switching frequency is needed for smaller inductors, but accept reduced light-load efficiency and less flexible sequencing. |
| RT8059ZSP | Dual buck only (no integrated LDOs); 2A/2A output; adjustable via FB resistors; 2.5MHz; requires external LDOs for analog rails | Requires additional components for noise-sensitive analog supplies; better suited for high-current digital-only loads | Choose when system already includes low-noise LDOs or when higher buck current (>1.2A) is required - not a drop-in replacement for MAX8667ETECQ+T's integrated LDO functionality. |
Compared with TPS65023RSBR and RT8059ZSP, MAX8667ETECQ+T uniquely combines factory-preset dual buck + dual LDO in one 3mm × 3mm package with individual enables and 100µA no-load current - making it optimal for space-constrained, battery-sensitive portable designs requiring clean analog and digital rails without external sequencing logic.
Availability
MAX8667ETECQ+T is available at Aetrix Electronics and suitable for smartphone power management, digital camera subsystems, and portable medical monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX8667ETECQ+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 industrial, automotive, and portable applications.
The MAX8667/MAX8668 product line was designed specifically to consolidate power delivery for multi-rail portable processors - integrating efficient buck conversion, low-noise LDO regulation, and flexible sequencing into minimal footprint packages for battery-powered systems.
FAQ
What is the guaranteed output current capability of MAX8667ETECQ+T on its buck regulators?
MAX8667ETECQ+T guarantees 600mA on OUT1 and 1200mA on OUT2 under all operating conditions across −40°C to +85°C. These values are specified in the Electrical Characteristics table and verified with worst-case process corners and temperature extremes - not typical or nominal ratings. Each buck regulator includes internal current limiting (pMOSFET peak limit and valley current protection) to sustain these currents continuously without derating.
Does MAX8667ETECQ+T support adjustable output voltages or only factory presets?
MAX8667ETECQ+T has factory-preset output voltages on all four regulators - OUT1, OUT2, OUT3, and OUT4 - as indicated by the "ETECQ" suffix in the part number. Unlike the MAX8668 variants, it does not support resistor-divider programming via FB1/FB2. The datasheet Selector Guide confirms MAX8667ETECQ+T is assigned fixed VOUT1 = 1.2V and VOUT2 = 1.8V, with OUT3/OUT4 set to 2.8V each.
How does the enable sequencing work across the four regulators in MAX8667ETECQ+T?
Each regulator in MAX8667ETECQ+T has its own dedicated enable input: EN1 (OUT1), EN2 (OUT2), EN3 (OUT3), and EN4 (OUT4). Driving any EN_ high initiates soft-start after tEN = 15µs (for subsequent enables) or tPWRON = 25µs (first enable from shutdown). This allows full control over power-up order - for example, enabling LDOs before bucks to pre-bias analog circuits - without external timing components.
What is the minimum input voltage required for reliable operation of MAX8667ETECQ+T's LDO regulators?
The LDO regulators (OUT3 and OUT4) in MAX8667ETECQ+T require a minimum input voltage of 1.7V on IN34, with undervoltage lockout releasing at 1.6V (typical). To maintain regulation at full 300mA load, the input must exceed the output voltage by at least 250mV - so for 2.8V LDO outputs, IN34 must be ≥3.05V. This ensures stable operation even as single-cell Li-ion batteries discharge below 3.3V.
Can MAX8667ETECQ+T operate with all four regulators enabled simultaneously, and what is the total supply current in that state?
Yes, MAX8667ETECQ+T is fully rated for concurrent operation of all four regulators. With all outputs enabled and no load, the typical supply current is 100µA (max 150µA) at TA = +25°C and VIN12 = VIN34 = 4.2V. This ultra-low quiescent current is achieved through optimized biasing and shutdown of unused internal blocks - a key advantage for battery-powered standby modes.
MAX8667ETECQ+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:
- 1.3V, 600mA
- Voltage/Current - Output 2:
- 1.3V, 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)
MAX8667ETECQ+T FAQ
1.How can I place an order for MAX8667ETECQ+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8667ETECQ+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 MAX8667ETECQ+T reliable?
The price and inventory of MAX8667ETECQ+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8667ETECQ+T is usually 5 days.
3.What payment methods are accepted for MAX8667ETECQ+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8667ETECQ+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8667ETECQ+T?
MAX8667ETECQ+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8667ETECQ+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 MAX8667ETECQ+T?
For technical support, including MAX8667ETECQ+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8667ETECQ+T requirements.
6.How does Aetrix verify that MAX8667ETECQ+T is sourced from the original manufacturer or authorized distributors?
All MAX8667ETECQ+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 MAX8667ETECQ+T meets industry standards.
7.What is the process for return or replacement of MAX8667ETECQ+T?
All MAX8667ETECQ+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8667ETECQ+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 MAX8667ETECQ+T part is unused and in its original packaging.
Return procedure for MAX8667ETECQ+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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