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Analog Devices Inc./Maxim Integrated MAX8667ETEJS+T
- Part No.:
- MAX8667ETEJS+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
MAX8667ETEJS+T.pdf
- Description:
- IC REG QUAD BUCK/LNR SYNC 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,734
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Product details
Overview
MAX8667ETEJS+T from Maxim Integrated is a dual step-down DC-DC converter with integrated dual LDO regulators, designed to power low-voltage microprocessors and DSPs in portable electronics. It delivers guaranteed 600mA on OUT1 and 1200mA on OUT2, features factory-preset output voltages (1.3V and 1.8V per datasheet), operates at 1.5MHz hysteretic-PWM, and achieves 100µA no-load supply current with all regulators enabled.
For engineers reviewing the MAX8667ETEJS+T datasheet, MAX8667ETEJS+T pinout, MAX8667ETEJS+T application, or MAX8667ETEJS+T equivalent, key selection criteria include guaranteed output current per rail, individual enable inputs for sequencing, ultra-low quiescent current in multi-rail active mode, LDO dropout voltage ≤250mV at 300mA, and thermal shutdown at +160°C with 15°C hysteresis.
Technical Context
The MAX8667ETEJS+T implements two independent step-down regulators using a proprietary hysteretic-PWM architecture with fixed ~1.5MHz switching frequency, p-channel high-side MOSFETs (RDS(ON) ≤0.6Ω for OUT1, ≤0.27Ω for OUT2), and synchronous n-channel rectifiers. Each buck stage includes valley-current limiting (750mA/1500mA typ) and soft-start (15µs enable time).
It integrates two 300mA LDOs (OUT3/OUT4) with 1.7V minimum input, 250mV max dropout at full load, 75µVRMS output noise (100Hz–100kHz), and 57dB PSRR below 1kHz. All four outputs feature dedicated enable pins (EN1–EN4), independent UVLO thresholds (2.5V for IN12, 1.6V for IN34), and thermal shutdown with automatic recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Configuration | Dual buck (OUT1/OUT2) + dual LDO (OUT3/OUT4); factory preset: OUT1 = 1.3V, OUT2 = 1.8V, OUT3 = OUT4 = 2.8V |
| Max Output Current | 600mA (OUT1), 1200mA (OUT2), 300mA each (OUT3/OUT4); guaranteed across -40°C to +85°C |
| Switching Frequency | 1.5MHz fixed-frequency hysteretic-PWM; enables use of 2.2µH chip inductors (0805 size) |
| No-Load Supply Current | 100µA typical with all four regulators enabled; critical for battery runtime in standby states |
| LDO Dropout Voltage | 250mV max at 300mA load; allows operation from 1.7V IN34 to deliver 2.8V outputs |
| Thermal Protection | Shuts down at +160°C junction temperature; auto-restarts after 15°C cooldown; prevents permanent damage during overload |
| UVLO Thresholds | IN12: 2.5V rising, 2.4V falling; IN34: 1.6V rising, 1.5V falling; ensures stable startup under weak battery conditions |
Pinout & Package
Package: 16-pin thin QFN, 3mm × 3mm, exposed paddle (EP), RoHS-compliant lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (EN3) | LDO3 enable input | Active-high logic; connect to IN34 or pull high to activate OUT3; drives low to reduce quiescent current |
| 2 (OUT3) | LDO3 output | 300mA regulated output; requires 4.7µF ceramic bypass to GND; discharged via 1kΩ internal resistor in shutdown |
| 3 (IN34) | LDO input supply | Shared 1.7V–5.5V input for both LDOs; must be ≤ VIN12; requires ≥4.7µF ceramic decoupling |
| 4 (OUT4) | LDO4 output | 300mA regulated output; identical bypass and discharge behavior as OUT3 |
| 5 (EN4) | LDO4 enable input | Independent active-high control for OUT4; enables flexible power sequencing |
| 6 (GND) | Analog ground reference | Signal return for REF, FB inputs, and logic; must be connected to system ground plane |
| 7 (REF) | Internal 0.6V reference output | Bypass with 0.01µF ceramic capacitor; used for feedback divider bias in MAX8668 variants |
| 8 (OUT2 / FB2) | Buck2 feedback input | In MAX8667ETEJS+T: direct connection to OUT2 node; not configurable-factory preset output |
| 9 (PGND2) | Power ground for buck2 | High-current return path for LX2 switch node; must be tied to GND with low-inductance connection |
| 10 (LX2) | Buck2 switch node | Connects to inductor and synchronous rectifier; handles peak currents up to 1.5A RMS |
| 11 (IN12) | Buck input supply | 2.8V–5.5V input for both buck regulators; requires ≥10µF ceramic decoupling; must be ≥ VIN34 |
| 12 (LX1) | Buck1 switch node | Identical function to LX2 but for OUT1; supports same inductor and current ratings |
| 13 (PGND1) | Power ground for buck1 | Separate high-current return for LX1; improves noise isolation between buck stages |
| 14 (OUT1 / FB1) | Buck1 feedback input | In MAX8667ETEJS+T: direct connection to OUT1 node; fixed 1.3V output, no external divider needed |
| 15 (EN1) | Buck1 enable input | Active-high control for OUT1; independent sequencing; reduces input current when driven low |
| 16 (EN2) | Buck2 enable input | Active-high control for OUT2; enables staggered startup and dynamic rail enable/disable |
| EP | Exposed paddle | Must be soldered to GND/PGND1/PGND2; primary thermal path; essential for power dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Individual enable inputs (EN1–EN4) | Enables precise power sequencing across four rails-critical for microprocessor core/I/O voltage ordering |
| 1.5MHz hysteretic-PWM control | Permits use of tiny 2.2µH inductors (0805 size) and minimizes board area vs. lower-frequency alternatives |
| 100µA no-load supply current (all rails active) | Extends battery life in always-on portable devices without sacrificing multi-rail functionality |
| Factory-preset outputs (1.3V/1.8V/2.8V/2.8V) | Eliminates external feedback resistors and layout complexity for standard processor supply configurations |
| Thermal shutdown with hysteresis (+160°C / 15°C) | Provides self-protecting operation under sustained overload while avoiding thermal oscillation |
| Low-noise LDOs (75µVRMS) | Meets stringent analog/RF supply requirements without additional filtering components |
Applications
| Smartphone Application | Digital Camera Application |
|---|---|
Use Scenario: Powering application processor cores (ARM Cortex-A series) and memory I/O in compact smartphones with tight thermal constraints. IC Role / Device Role / Timing Role: Primary PMIC delivering 1.3V core, 1.8V I/O, and dual 2.8V analog rails with independent sequencing via EN1–EN4. Use Value: Factory-preset voltages eliminate BOM cost and layout risk; 100µA no-load current extends standby time; thermal shutdown prevents field failures. | Use Scenario: Supplying image sensor analog front-end, ISP core, and LCD backlight driver in high-resolution digital cameras. IC Role / Device Role / Timing Role: Single-chip solution generating clean, sequenced 1.3V (ISP), 1.8V (sensor interface), and dual 2.8V (analog bias) rails. Use Value: 75µVRMS LDO noise ensures low image sensor readout noise; 1.5MHz switching avoids interference with image capture timing. |
| PDA System Power | Handheld Medical Instrument |
Use Scenario: Power management for legacy PDA platforms requiring multiple low-voltage rails with minimal PCB area. IC Role / Device Role / Timing Role: Consolidates four discrete regulators into one 3mm × 3mm QFN, reducing component count and routing complexity. Use Value: Tiny 2.2µH inductors save board space; individual enables support legacy boot sequences; -40°C to +85°C rating ensures outdoor reliability. | Use Scenario: Battery-powered handheld ECG or glucose meter requiring stable, low-noise analog supplies and long shelf life. IC Role / Device Role / Timing Role: Delivers precision 2.8V analog bias (OUT3/OUT4) and digital 1.3V/1.8V rails with ultra-low quiescent current during sleep modes. Use Value: 250mV LDO dropout enables operation down to 1.7V battery voltage; 100µA multi-rail idle current maximizes battery calendar life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65023RGZR | Triple buck + dual LDO; 1.2MHz switching; 1.2V/1.5V/1.8V buck outputs; 3.3V/2.8V LDOs; 125µA no-load current | Higher integration (3 buck + 2 LDO), but lacks independent enable per LDO; different output voltage setpoints | Select when needing three buck rails and tighter voltage tolerance (±1% vs ±3% on MAX8667ETEJS+T LDOs) |
| RT8059ZSP | Dual buck only (no LDOs); 2A/2A outputs; adjustable 0.6V–5.5V; 30µA no-load current; 2.5MHz switching | Higher current capability and efficiency, but requires external LDOs for analog rails-increasing BOM and layout complexity | Select when prioritizing high-efficiency digital rails and willing to add discrete LDOs for analog sections |
Compared with TPS65023RGZR and RT8059ZSP, the MAX8667ETEJS+T offers optimal balance of integrated LDOs, factory-preset voltages for common processor configurations, and ultra-low multi-rail idle current-making it ideal for space-constrained portable designs where analog rail noise and battery standby life are critical.
Availability
MAX8667ETEJS+T is available at Aetrix Electronics and suitable for smartphone power management, digital camera subsystems, PDA platforms, and handheld medical instruments requiring stable component supply with guaranteed long-term availability.
Supply support for MAX8667ETEJS+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 consumer applications.
The MAX8667/MAX8668 product line was engineered specifically for portable electronics power systems-integrating dual high-efficiency buck converters and dual low-noise LDOs in a miniature QFN package to minimize board area and maximize battery life.
FAQ
What output voltages does the MAX8667ETEJS+T provide?
The MAX8667ETEJS+T delivers factory-preset outputs: OUT1 = 1.300V (±3.0% over temperature), OUT2 = 1.800V (±3.0%), OUT3 = 2.800V, and OUT4 = 2.800V. These values are confirmed in the Electrical Characteristics table (page 3 of the datasheet) under "OUT1, OUT2 Regulation Voltage" and "LDO REGULATORS" sections. No external feedback resistors are required-making the MAX8667ETEJS+T a plug-and-play solution for standard processor supply configurations.
Does the MAX8667ETEJS+T support independent power sequencing?
Yes, the MAX8667ETEJS+T provides four dedicated enable inputs-EN1 for OUT1, EN2 for OUT2, EN3 for OUT3, and EN4 for OUT4-all active-high and electrically isolated. This allows precise control over startup order, dynamic rail enable/disable, and low-power state management. The timing diagram (Figure 2) specifies tEN = 15µs for subsequent enables and tPWRON = 25µs for the first enable from shutdown-enabling robust sequencing for microprocessor core/I/O/analog rail dependencies.
What is the minimum input voltage required for the LDOs in the MAX8667ETEJS+T?
The LDO regulators (OUT3 and OUT4) in the MAX8667ETEJS+T operate from a minimum input voltage of 1.7V on the IN34 pin, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. The undervoltage lockout (UVLO) circuit disables the LDOs when VIN34 falls below 1.5V (typical), and they resume operation when VIN34 rises above 1.6V (typical). This 1.7V–5.5V input range enables compatibility with single-cell Li-ion batteries down to near depletion.
How does thermal protection work in the MAX8667ETEJS+T?
The MAX8667ETEJS+T incorporates thermal-overload protection that monitors die temperature and shuts down all regulators when junction temperature exceeds +160°C. After shutdown, the device remains off until the die cools by at least 15°C, then automatically resumes operation. This hysteresis prevents thermal oscillation. The protection is documented in the Electrical Characteristics table (page 2) and Detailed Description section (page 11), ensuring safe operation under continuous overload or poor heatsinking conditions without external intervention.
Can the MAX8667ETEJS+T be used with ceramic output capacitors only?
Yes, the MAX8667ETEJS+T is fully compatible with ceramic output capacitors. The Typical Operating Circuit (Figure 3) specifies 2.2µF ceramics for OUT1/OUT2 and 4.7µF ceramics for OUT3/OUT4. The device's hysteretic-PWM control loop is stable with low-ESR ceramics, eliminating need for tantalum or electrolytic capacitors. Input capacitor C2 is also specified as 10µF ceramic. This simplifies design, improves reliability, and reduces board area compared to hybrid capacitor solutions.
MAX8667ETEJS+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:
- 3.3V, 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)
MAX8667ETEJS+T FAQ
1.How can I place an order for MAX8667ETEJS+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8667ETEJS+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 MAX8667ETEJS+T reliable?
The price and inventory of MAX8667ETEJS+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8667ETEJS+T is usually 5 days.
3.What payment methods are accepted for MAX8667ETEJS+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8667ETEJS+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8667ETEJS+T?
MAX8667ETEJS+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8667ETEJS+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 MAX8667ETEJS+T?
For technical support, including MAX8667ETEJS+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8667ETEJS+T requirements.
6.How does Aetrix verify that MAX8667ETEJS+T is sourced from the original manufacturer or authorized distributors?
All MAX8667ETEJS+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 MAX8667ETEJS+T meets industry standards.
7.What is the process for return or replacement of MAX8667ETEJS+T?
All MAX8667ETEJS+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8667ETEJS+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 MAX8667ETEJS+T part is unused and in its original packaging.
Return procedure for MAX8667ETEJS+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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