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Analog Devices Inc./Maxim Integrated MAX8668ETEV+
- Part No.:
- MAX8668ETEV+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- -
- Datasheet:
-
MAX8668ETEV+.pdf
- Description:
- IC REG QUAD BUCK/LNR SYNC 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,792
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Product details
Overview
MAX8668ETEV+ 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 600mA from adjustable OUT1 (0.6V–3.3V) and 1200mA from adjustable OUT2 (0.6V–3.3V), plus two 300mA LDOs (OUT3/OUT4) operating down to 1.7V input. Designed for portable microprocessor/DSP power rails, it achieves 100µA no-load supply current and supports ultra-fast load transients in smartphones and digital cameras.
For engineers reviewing the MAX8668ETEV+ datasheet, MAX8668ETEV+ pinout, MAX8668ETEV+ application, or MAX8668ETEV+ equivalent, key selection criteria include its 1.5MHz hysteretic-PWM architecture, individual enable inputs per regulator (EN1–EN4), voltage positioning capability for OUT1/OUT2, guaranteed dropout performance at 250mV (LDOs), and thermal shutdown at +160°C - all validated for -40°C to +85°C operation.
Technical Context
The MAX8668ETEV+ integrates two synchronous step-down converters using a proprietary hysteretic-PWM control scheme operating at ~1.5MHz, enabling compact 2.2µH inductors and minimizing external component count. Each buck stage features p-channel high-side switches (ON-resistance ≤0.6Ω) and n-channel synchronous rectifiers with valley-current limiting (1200mA min for OUT2).
Its dual LDOs (OUT3/OUT4) use p-channel pass transistors, deliver 300mA each, and maintain low output noise (75µVRMS, 100Hz–100kHz) with 57dB PSRR below 1kHz. All four regulators feature independent enables, soft-start (100µs for LDOs, variable for bucks), and separate UVLO thresholds (2.5V for IN12, 1.6V for IN34).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.5MHz fixed-frequency hysteretic-PWM - enables use of tiny 2.2µH chip inductors and reduces EMI filtering burden. |
| OUT1 Output Range | 0.6V to 3.3V adjustable via FB1 resistor divider - supports core voltage scaling for ARM Cortex-A/M series processors. |
| OUT2 Output Current | 1200mA guaranteed - sufficient for memory I/O or GPU rail in mid-tier smartphones. |
| LDO Dropout Voltage | 250mV max at 300mA - allows operation from 1.95V input to deliver 1.7V LDO output, extending battery runtime. |
| No-Load Supply Current | 100µA typical with all regulators enabled - critical for standby power budget in always-on sensor subsystems. |
| Thermal Shutdown | +160°C threshold with 15°C hysteresis - provides self-recovery protection during sustained overload without external circuitry. |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade portable electronics including handheld test equipment. |
Pinout & Package
MAX8668ETEV+ uses a 16-pin, 3mm × 3mm thin QFN package with exposed paddle (EP) requiring connection to GND/PGND1/PGND2 for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN1, EN2 | Enable inputs for step-down regulators OUT1 and OUT2 | Active-high logic; allow independent sequencing and dynamic power gating of processor core/I/O rails. |
| EN3, EN4 | Enable inputs for LDO regulators OUT3 and OUT4 | Enable/disable analog/peripheral supplies independently; reduce quiescent current when unused. |
| FB1, FB2 | Feedback inputs for OUT1 and OUT2 | Accept resistor dividers to set output voltage; support voltage positioning by sensing at LX node for improved transient response. |
| LX1, LX2 | Switch-node connections for buck regulators | Drive external 2.2µH inductors; require low-ESR ceramic output capacitors (2.2µF–4.7µF) placed close to pins. |
| PGND1, PGND2 | Power ground returns for buck stages | Must be routed separately from signal GND and tied to EP to minimize switching noise coupling into sensitive analog sections. |
| IN12, IN34 | Input supplies for buck (2.6V–5.5V) and LDO (1.7V–5.5V) sections | Require local 10µF (IN12) and 4.7µF (IN34) ceramic bypass capacitors; IN12 ≥ IN34 mandatory. |
| REF | 0.6V precision reference output | Bypassed with 0.01µF ceramic capacitor; used internally for regulation and available for external monitoring or biasing. |
Key Features
| Feature | Design Value |
|---|---|
| Voltage positioning support | Configurable via FB1/FB2 resistor network to match output droop with load transients - reduces required output capacitance by up to 30% in camera ISP applications. |
| Synchronous rectification | Eliminates need for external Schottky diodes in buck stages - improves light-load efficiency and reduces board area in space-constrained PCBs. |
| Individual regulator enables | Four dedicated EN_ pins (EN1–EN4) enable precise power sequencing - essential for meeting boot-order requirements in multi-rail SoC designs. |
| Low-noise LDO outputs | 75µVRMS output noise (100Hz–100kHz) and 57dB PSRR <1kHz - suitable for powering RF front-ends and high-resolution ADCs without additional filtering. |
| Ultra-low shutdown current | <1µA total supply current with all EN_ low - extends shelf life and enables long-term storage mode in IoT edge nodes. |
Applications
| Smartphone Application | Digital Camera Power System |
|---|---|
Use Scenario: Dual-core application processor with separate core (VDD_ARM), I/O (VDD_IO), memory (VDD_MEM), and camera interface (VDD_CAM) rails. IC Role / Device Role / Timing Role: Single-chip quad-output PMIC providing VDD_ARM (1.2V/600mA), VDD_IO (1.8V/1200mA), VDD_CAM_LDO (2.8V/300mA), and VDD_IF_LDO (3.3V/300mA) with independent enable timing. Use Value: Reduces BOM count by replacing four discrete regulators; voltage positioning on buck outputs minimizes output cap count for fast camera autofocus transients. | Use Scenario: High-resolution image sensor with real-time ISP processing requiring tightly regulated, low-noise supplies. IC Role / Device Role / Timing Role: Supplies sensor analog core (1.2V/600mA), digital logic (1.8V/1200mA), and analog front-end (2.8V/300mA) with <75µVRMS noise and <100µA no-load draw. Use Value: Enables clean image capture under low-light conditions by suppressing switching noise coupling into analog signal chain via integrated LDOs and layout-optimized PGND separation. |
| Handheld Medical Instrument | PDA System Power Management |
Use Scenario: Battery-powered glucose meter with LCD display, Bluetooth radio, and precision analog front-end. IC Role / Device Role / Timing Role: Powers MCU core (1.2V), display driver (3.3V), BLE SoC (1.8V), and AFE reference (2.5V) using OUT1, OUT2, OUT3, and OUT4 with sequenced startup. Use Value: 100µA no-load current extends single-cell Li-ion runtime beyond 12 months in standby; thermal shutdown prevents overheating during extended measurement cycles. | Use Scenario: Legacy PDA with ARM9 processor, SD card interface, backlight LED driver, and audio codec. IC Role / Device Role / Timing Role: Delivers VDD_CORE (1.3V/600mA), VDD_IO (3.3V/1200mA), VDD_SD (3.3V/300mA), and VDD_AUDIO (2.8V/300mA) with independent enable control for peripheral power gating. Use Value: Individual EN_ pins allow dynamic shutdown of SD card and audio subsystems during idle - reducing average system power by >40% versus fixed-rail solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-output PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65023RSBR | Triple buck + single LDO; 3MHz switching; no voltage positioning; 1.2V ref; different pinout | Requires external LDO for fourth rail; higher switching frequency increases EMI risk near RF sections | Select when needing higher-frequency operation and can accept reduced flexibility in output configuration |
| RT8059GQW | Dual buck + dual LDO; 2.5MHz; fixed 1.2V/1.8V bucks; no FB adjustment; lower IQ (50µA) | Factory-set outputs limit design reuse across multiple platforms; lacks voltage positioning for transient optimization | Select for cost-sensitive, single-platform designs where output voltages are fixed and transient demands are moderate |
Compared with TPS65023RSBR and RT8059GQW, the MAX8668ETEV+ uniquely supports adjustable buck outputs with voltage positioning, individual enables per rail, and validated -40°C to +85°C operation - making it optimal for portable systems requiring flexible, low-noise, thermally robust multi-rail power delivery.
Availability
MAX8668ETEV+ is available at Aetrix Electronics and suitable for smartphone power management, digital camera subsystems, handheld medical instruments, and PDA system power requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX8668ETEV+ 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and portable applications.
The MAX8668 is part of Maxim's portable power management product line, engineered specifically to consolidate multiple voltage rails for microprocessors and DSPs in battery-operated devices while minimizing footprint, quiescent current, and noise.
FAQ
What is the maximum input voltage rating for the MAX8668ETEV+ step-down regulators?
The MAX8668ETEV+ step-down regulators (OUT1 and OUT2) have an absolute maximum input voltage rating of +6.0V on IN12, but the recommended operating range is 2.6V to 5.5V. Exceeding 5.5V risks violating the LX-to-GND clamp diode limits and may cause permanent damage. The datasheet specifies that LX1/LX2 must not exceed VIN12 + 0.3V, confirming strict adherence to this input ceiling for reliable operation of the MAX8668ETEV+.
Can the MAX8668ETEV+ LDO outputs (OUT3/OUT4) be used with input voltage below 2.0V?
Yes - the MAX8668ETEV+ LDO regulators support input voltages as low as 1.7V on IN34, enabling direct connection to partially discharged single-cell Li-ion batteries (down to ~3.0V pack, ~1.5V/cell under load). The LDOs maintain regulation with 250mV dropout at 300mA, so a 1.95V IN34 input sustains 1.7V output. This capability is explicitly verified across -40°C to +85°C and is a defined feature of the MAX8668ETEV+.
Does the MAX8668ETEV+ support power sequencing between its four outputs?
Yes - the MAX8668ETEV+ provides full power sequencing control via four independent enable inputs (EN1–EN4), each controlling one regulator. Timing parameters are specified: tPWRON = 25µs (first enable from shutdown) and tEN = 15µs (subsequent enables). This allows precise ordering - e.g., enabling OUT3 (analog supply) before OUT1 (core) - which is essential for preventing latch-up in SoCs and is a documented behavior of the MAX8668ETEV+.
What is the feedback reference voltage (VFB) used by the MAX8668ETEV+ for adjustable outputs?
The MAX8668ETEV+ uses a precision 0.600V ±1.5% internal reference voltage (VFB) for both FB1 and FB2 inputs. This value is guaranteed over -40°C to +85°C and is the basis for calculating R1/R2 resistor values in the feedback network. The datasheet specifies min/typ/max as 0.582V/0.600V/0.618V, confirming tight tolerance critical for accurate voltage setting in the MAX8668ETEV+.
Is the MAX8668ETEV+ RoHS-compliant and lead-free?
Yes - the "+" suffix in MAX8668ETEV+ denotes a lead-free, RoHS-compliant packaging option. The device uses a matte tin finish on the 16-pin thin QFN package and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) requirements. This compliance is confirmed in Maxim's official ordering information table and applies specifically to the MAX8668ETEV+ variant.
MAX8668ETEV+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Product Status:
- Active
- Topology:
- -
- Number of Outputs:
- -
- Frequency - Switching:
- -
- Voltage/Current - Output 1:
- -
- Voltage/Current - Output 2:
- -
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- -
- w/Supervisor:
- -
- w/Sequencer:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX8668ETEV+ FAQ
1.How can I place an order for MAX8668ETEV+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8668ETEV+ 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 MAX8668ETEV+ reliable?
The price and inventory of MAX8668ETEV+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8668ETEV+ is usually 5 days.
3.What payment methods are accepted for MAX8668ETEV+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8668ETEV+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8668ETEV+?
MAX8668ETEV+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8668ETEV+ 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 MAX8668ETEV+?
For technical support, including MAX8668ETEV+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8668ETEV+ requirements.
6.How does Aetrix verify that MAX8668ETEV+ is sourced from the original manufacturer or authorized distributors?
All MAX8668ETEV+ 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 MAX8668ETEV+ meets industry standards.
7.What is the process for return or replacement of MAX8668ETEV+?
All MAX8668ETEV+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8668ETEV+, 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 MAX8668ETEV+ part is unused and in its original packaging.
Return procedure for MAX8668ETEV+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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