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Analog Devices Inc./Maxim Integrated MAX8668ETEQ+T
- Part No.:
- MAX8668ETEQ+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
MAX8668ETEQ+T.pdf
- Description:
- IC REG QUAD BUCK/LNR SYNC 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,831
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Product details
Overview
MAX8668ETEQ+T from Maxim Integrated is a dual 1.5MHz step-down DC-DC converter with dual low-noise LDO regulators, designed to power microprocessors and DSPs in portable electronics. It delivers 600mA on OUT1 and 1200mA on OUT2 (adjustable 0.6V–3.3V), 300mA per LDO (OUT3/OUT4), and operates with 100µA no-load supply current across all four outputs. Used in smartphones and digital cameras for multi-rail power management.
For engineers reviewing the MAX8668ETEQ+T datasheet, MAX8668ETEQ+T pinout, MAX8668ETEQ+T application, or MAX8668ETEQ+T equivalent, key selection criteria include adjustable dual-buck output voltage range, individual enable control per regulator, ultra-low quiescent current in multi-output active mode, and thermal shutdown at +160°C with 15°C hysteresis.
Technical Context
The MAX8668ETEQ+T implements a proprietary hysteretic-PWM control scheme enabling fixed-frequency switching up to 1.5MHz, minimizing external component size while maintaining fast transient response. Its dual buck stages use internal p-channel high-side switches and synchronous n-channel rectifiers - eliminating external Schottky diodes and reducing conduction loss.
Each of the four regulated outputs (OUT1–OUT4) has independent enable inputs (EN1–EN4), supporting flexible power sequencing. The LDOs operate down to 1.7V input and deliver 300mA with 75µVRMS output noise (100Hz–100kHz) and 57dB PSRR below 1kHz, while the buck regulators feature voltage positioning via FB1/FB2 feedback to reduce output capacitance requirements during load transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.5MHz fixed-frequency operation enables use of tiny 2.2µH chip inductors (0805) and reduces EMI filtering burden. |
| OUT1 Output Current | 600mA guaranteed - sufficient for core logic rails of low-voltage microprocessors (e.g., ARM Cortex-A series). |
| OUT2 Output Current | 1200mA guaranteed - supports higher-current I/O or memory subsystems in portable SoC designs. |
| LDO Output Current | 300mA per LDO (OUT3/OUT4) - powers analog blocks, sensors, or RF front-ends requiring low-noise bias. |
| No-Load Supply Current | 100µA typical with all four outputs enabled - extends battery life in always-on standby modes. |
| Input Voltage Ranges | IN12: 2.6V–5.5V (buck supplies); IN34: 1.7V–5.5V (LDO supplies) - accommodates Li-ion, Li-poly, and regulated intermediate rails. |
| Thermal Shutdown | +160°C threshold with 15°C hysteresis - protects against sustained overload without requiring external thermal monitoring. |
Pinout & Package
MAX8668ETEQ+T is housed in a space-saving 3mm × 3mm, 16-pin thin QFN package with exposed paddle (EP) for thermal dissipation. Pin 1 is EN3; pin 16 is EN2; EP must be connected to GND, PGND1, and PGND2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1, EN2, EN3, EN4 | Individual regulator enable inputs | Active-high logic allows precise power sequencing - e.g., enable LDOs before bucks to avoid reverse current or enable core rail before I/O rail. |
| FB1, FB2 | Adjustable buck feedback inputs | Connect to resistor divider between OUT1/OUT2 and GND to set output voltage (0.6V–3.3V); supports voltage positioning for improved transient response. |
| OUT1, OUT2 | Buck regulator outputs | Direct connection points for output capacitors; OUT1 rated 600mA, OUT2 rated 1200mA - require ≥2.2µF ceramic output capacitance each. |
| OUT3, OUT4 | LDO regulator outputs | Factory-fixed outputs (no external feedback); bypassed with 4.7µF ceramic caps - low-noise rails for sensitive analog circuitry. |
| LX1, LX2 | Switch node connections | Drive external 2.2µH inductors; must be routed with short, low-inductance traces to minimize EMI and switching losses. |
| PGND1, PGND2 | Power ground returns | Separate ground paths for buck stages reduce coupling between switching and linear sections - critical for noise-sensitive LDO performance. |
| IN12, IN34 | Input supply pins | IN12 powers buck regulators (2.6V–5.5V); IN34 powers LDOs (1.7V–5.5V); both require ≥4.7µF ceramic decoupling close to pins. |
| REF | Internal reference output | 0.600V ±1% reference; bypassed with 0.01µF ceramic cap - used internally for regulation and available for external monitoring or calibration. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic-PWM control | Enables stable 1.5MHz operation with minimal external components and <100µA no-load current across all four outputs. |
| Voltage positioning | Configurable via FB1/FB2 resistive dividers to match inductor DCR-induced droop - reduces peak-to-peak output deviation during load transients by up to 2×. |
| Independent enable inputs | Four dedicated EN_ pins (EN1–EN4) allow programmable power-up/down sequencing - essential for SoC compliance with AVS or dynamic voltage scaling. |
| Synchronous rectification | Eliminates need for external Schottky diodes in buck stages - improves efficiency by 5–10% at medium loads and reduces board area. |
| Low-noise LDO architecture | 75µVRMS output noise (100Hz–100kHz) and 57dB PSRR below 1kHz - suitable for powering PLLs, ADCs, and RF synthesizers. |
Applications
| Smartphone Application | Digital Camera Application |
|---|---|
Use Scenario: Powering application processor (core, I/O, memory) and camera sensor interface in compact smartphone PCBs with strict thermal and size constraints. IC Role / Device Role / Timing Role: Dual-buck stage supplies CPU core (OUT1) and GPU/memory (OUT2); dual-LDOs (OUT3/OUT4) power image signal processor analog front-end and autofocus motor driver. Use Value: 100µA no-load current extends standby time; 1.5MHz switching allows 2.2µH inductors - saving >30% board area vs. 500kHz solutions. | Use Scenario: Providing tightly regulated, low-noise rails for CMOS image sensor, lens actuator, and video encoder in portable digital cameras. IC Role / Device Role / Timing Role: OUT1 (1.2V/600mA) powers sensor digital core; OUT2 (2.8V/1200mA) drives sensor analog supply; OUT3/OUT4 (2.8V/300mA each) bias ISP analog blocks and flash LED driver. Use Value: Voltage positioning minimizes output capacitor count; 75µVRMS LDO noise prevents image banding; thermal shutdown prevents lens jam during extended recording. |
| PDA Power Management | Handheld Instrument Application |
Use Scenario: Multi-rail power delivery in palm-sized PDAs with ARM-based SoC, touchscreen controller, and SD card interface. IC Role / Device Role / Timing Role: Buck regulators supply SoC VDD and VDDIO; LDOs provide clean 3.3V for USB PHY and 1.8V for NAND flash interface - all sequenced via EN1–EN4. Use Value: Individual enables ensure correct boot order (e.g., memory rail before core); 1.7V LDO input capability supports single-cell Li-ion operation down to 3.0V system voltage. | Use Scenario: Precision power for handheld multimeters, spectrum analyzers, and portable oscilloscopes requiring stable analog references and low-noise ADC supplies. IC Role / Device Role / Timing Role: OUT1/OUT2 generate precision 2.5V and 5.0V rails for DACs and op-amps; OUT3/OUT4 supply 3.3V to microcontroller and 1.2V to FPGA configuration logic. Use Value: REF pin provides traceable 0.600V reference for self-calibration; 57dB PSRR suppresses switching noise from affecting measurement accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-output PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65023RGZR | Triple buck + dual LDO; 3MHz switching; integrated I2C interface; no voltage positioning. | Requires firmware control for sequencing; better suited for systems needing dynamic voltage scaling over fixed sequencing. | Choose TPS65023RGZR when I2C programmability and higher switching frequency are prioritized over ultra-low no-load current. |
| RT8059ZSP | Dual buck only (no LDOs); 2A per channel; 2.5MHz; external compensation; no individual enables. | Lacks integrated LDOs - requires separate low-noise regulators for analog rails; simpler sequencing but higher BOM count. | Choose RT8059ZSP when only high-current digital rails are needed and LDO integration is unnecessary. |
Compared with TPS65023RGZR and RT8059ZSP, the MAX8668ETEQ+T uniquely combines individual hardware enables, voltage positioning, and sub-100µA multi-output quiescent current - making it optimal for cost-sensitive, battery-powered devices where firmware complexity and board area are constrained.
Availability
MAX8668ETEQ+T is available at Aetrix Electronics and suitable for smartphone power management, digital camera subsystems, PDA SoC support, and handheld instrumentation requiring stable component supply with full production traceability.
Supply support for MAX8668ETEQ+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 MAX8668ETEQ+T belongs to Maxim's portable PMIC product line, engineered specifically for space-constrained, battery-operated devices requiring efficient multi-rail power with minimal external components and robust thermal protection.
FAQ
What is the maximum input voltage for the MAX8668ETEQ+T buck regulators?
The MAX8668ETEQ+T buck regulators (OUT1 and OUT2) accept an input voltage range of 2.6V to 5.5V on the IN12 pin. This supply must be ≥ VIN34. Exceeding 5.5V risks permanent damage, as absolute maximum rating for IN12 is +6.0V relative to GND. Always use a 10µF ceramic capacitor between IN12 and GND for stability and noise suppression.
Can the MAX8668ETEQ+T LDO outputs (OUT3/OUT4) be adjusted externally?
No, the MAX8668ETEQ+T LDO outputs (OUT3 and OUT4) are factory preset and not adjustable. Their voltages are fixed during manufacturing and cannot be modified with external resistors. For adjustable LDOs, consider alternative PMICs such as the MAX8667 family variants with different top-mark codes - but note that MAX8668ETEQ+T itself provides only fixed 300mA LDO outputs.
How does voltage positioning work on the MAX8668ETEQ+T buck regulators?
Voltage positioning on the MAX8668ETEQ+T is implemented via the FB1 and FB2 pins using a resistor network that senses feedback from the LX node (switch node) rather than directly from the output. This introduces controlled output droop proportional to load current and inductor DCR, matching transient load behavior and reducing required output capacitance. It is configured using R1/R2/R6 per Figure 5 in the datasheet.
What is the purpose of the REF pin on the MAX8668ETEQ+T?
The REF pin on the MAX8668ETEQ+T provides a buffered 0.600V ±1% internal reference voltage, bypassed with a 0.01µF ceramic capacitor. It serves as the regulation基准 for all feedback loops and can be used externally for calibration, monitoring, or as a precision reference for auxiliary circuits - but it is not intended as a general-purpose voltage source due to limited current drive capability.
Does the MAX8668ETEQ+T support power sequencing across its four outputs?
Yes, the MAX8668ETEQ+T supports full hardware-based power sequencing via four independent enable inputs: EN1 (OUT1), EN2 (OUT2), EN3 (OUT3), and EN4 (OUT4). Each input is active-high and allows staggered turn-on/turn-off timing - for example, enabling OUT3 before OUT1 ensures analog bias is established prior to digital core activation, preventing latch-up or startup glitches.
MAX8668ETEQ+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:
- Active
- Topology:
- Step-Down (Buck) Synchronous (2), Linear (LDO) (2)
- Number of Outputs:
- 4
- Frequency - Switching:
- 1.5MHz
- Voltage/Current - Output 1:
- 0.6V ~ 3.3V, 600mA
- Voltage/Current - Output 2:
- 0.6V ~ 3.3V, 1.2A
- Voltage/Current - Output 3:
- 2.8V, 300mA
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 2.6V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (3x3)
MAX8668ETEQ+T FAQ
1.How can I place an order for MAX8668ETEQ+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8668ETEQ+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 MAX8668ETEQ+T reliable?
The price and inventory of MAX8668ETEQ+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8668ETEQ+T is usually 5 days.
3.What payment methods are accepted for MAX8668ETEQ+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8668ETEQ+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8668ETEQ+T?
MAX8668ETEQ+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8668ETEQ+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 MAX8668ETEQ+T?
For technical support, including MAX8668ETEQ+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8668ETEQ+T requirements.
6.How does Aetrix verify that MAX8668ETEQ+T is sourced from the original manufacturer or authorized distributors?
All MAX8668ETEQ+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 MAX8668ETEQ+T meets industry standards.
7.What is the process for return or replacement of MAX8668ETEQ+T?
All MAX8668ETEQ+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8668ETEQ+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 MAX8668ETEQ+T part is unused and in its original packaging.
Return procedure for MAX8668ETEQ+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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