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Analog Devices Inc./Maxim Integrated MAX8667ETEHR+
- Part No.:
- MAX8667ETEHR+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
MAX8667ETEHR+.pdf
- Description:
- IC REG QUAD BUCK/LNR SYNC 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,274
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Product details
Overview
MAX8667ETEHR+ 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, features factory-preset output voltages (no external feedback required), operates at 1.5MHz hysteretic-PWM for compact external components, and supports individual enable control per regulator for flexible power sequencing in smartphones and digital cameras.
For engineers reviewing the MAX8667ETEHR+ datasheet, MAX8667ETEHR+ pinout, MAX8667ETEHR+ application, or MAX8667ETEHR+ equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters (including 100µA no-load supply current, 1.7V minimum LDO input, and -40°C to +85°C temperature range), and real-world selection guidance against comparable dual-buck+LDO PMICs.
Technical Context
The MAX8667ETEHR+ integrates two high-efficiency synchronous step-down converters (OUT1/OUT2) and two low-noise LDOs (OUT3/OUT4) in a single 16-pin thin QFN package. Its 1.5MHz hysteretic-PWM architecture enables ultra-fast load transient response and eliminates need for external compensation, while factory-preset outputs remove feedback resistor networks.
Each regulator has independent enable inputs (EN1–EN4), supporting arbitrary power-up sequencing. The step-down regulators use p-channel high-side switches with synchronous rectification and feature 600mA/1200mA guaranteed output current, while the LDOs operate down to 1.7V input and deliver 300mA each with 75µVRMS output noise (100Hz–100kHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Configuration | Dual synchronous buck (OUT1/OUT2) + dual LDO (OUT3/OUT4); all four outputs independently enabled |
| OUT1/OUT2 Current Rating | 600mA (OUT1), 1200mA (OUT2); guaranteed across -40°C to +85°C with internal current limiting |
| Switching Frequency | 1.5MHz fixed-frequency hysteretic-PWM; enables use of 2.2µH chip inductors and reduces EMI filtering burden |
| No-Load Supply Current | 100µA typical with all four regulators enabled; critical for battery runtime in standby mode |
| LDO Input Range | 1.7V to 5.5V (IN34); allows direct connection to single-cell Li-ion or regulated intermediate rail |
| Operating Temperature | -40°C to +85°C extended range; qualified for industrial and consumer portable applications |
| Package | 16-pin thin QFN, 3mm × 3mm; thermally enhanced exposed paddle tied to ground for 1667mW dissipation at +70°C |
Pinout & Package
MAX8667ETEHR+ is housed in a space-saving 16-pin thin QFN package (3mm × 3mm) with exposed thermal paddle (EP), rated for -40°C to +85°C operation and 1667mW continuous power dissipation at +70°C (derated 20.8mW/°C above).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (EN3) | LDO3 enable input | Active-high logic; drives high or connects to IN34 to activate OUT3; pulls low to disable and reduce quiescent current |
| 2 (OUT3) | LDO3 output | Factory-preset voltage (e.g., 2.8V or 3.3V per Selector Guide); requires 4.7µF ceramic bypass to GND |
| 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 | Factory-preset voltage; independent of OUT3; discharged via 1kΩ internal resistor in shutdown |
| 5 (EN4) | LDO4 enable input | Independent active-high control; enables precise sequencing of second LDO rail |
| 6 (GND) | Analog/digital ground reference | Common return for bias circuitry; must be connected to system ground plane |
| 7 (REF) | Internal 0.6V reference output | Bypassed with 0.01µF ceramic capacitor; used internally for regulation; not user-accessible for external feedback |
| 8 (OUT2 / FB2) | OUT2 output or FB2 feedback | On MAX8667: direct output connection (factory preset); on MAX8668: feedback node for adjustable VOUT2 |
| 9 (PGND2) | Power ground for buck2 | Separate low-impedance return path for LX2 switching current; must tie to GND near inductor |
| 10 (LX2) | Buck2 switch node | Connects to 2.2µH inductor; contains high dv/dt; requires tight layout and local ceramic decoupling |
| 11 (IN12) | Buck input supply | 2.8V–5.5V input for both step-down regulators; requires ≥10µF ceramic decoupling; must be ≥ VIN34 |
| 12 (LX1) | Buck1 switch node | Connects to second 2.2µH inductor; same layout constraints as LX2 |
| 13 (PGND1) | Power ground for buck1 | Separate return for LX1 current; routed separately from PGND2 to minimize crosstalk |
| 14 (OUT1 / FB1) | OUT1 output or FB1 feedback | On MAX8667: direct output (e.g., 1.2V); on MAX8668: feedback node for adjustable VOUT1 |
| 15 (EN1) | Buck1 enable input | Active-high control for OUT1; enables soft-start and shutdown with <1µA leakage |
| 16 (EN2) | Buck2 enable input | Independent control for OUT2; supports staggered startup to limit inrush current |
| EP | Exposed thermal paddle | Must be soldered to PCB ground plane for thermal performance and EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| Individual per-rail enable inputs | EN1–EN4 allow full control over power-up/down sequencing without external logic or timing circuits |
| Factory-preset outputs (MAX8667) | Eliminates external feedback resistors for OUT1/OUT2 - reduces BOM count and layout area vs. adjustable variants |
| 1.5MHz hysteretic-PWM control | Enables use of tiny 2.2µH inductors and minimizes output capacitance; achieves <100µA no-load current |
| Dual LDOs with 1.7V min input | Supports direct connection to single-cell Li-ion (2.7–4.2V) or low-voltage intermediate rails without pre-regulation |
| Low-noise LDO operation | 75µVRMS output noise (100Hz–100kHz) and 57dB PSRR below 1kHz - suitable for RF and analog subsystems |
| Thermal shutdown with hysteresis | 160°C trip threshold with 15°C hysteresis prevents thermal cycling; protects during sustained overload or poor heatsinking |
Applications
| Smartphone Core Power | Digital Camera Sensor Rail |
|---|---|
|
Use Scenario: Powering application processor cores (e.g., ARM Cortex-A series) requiring tightly regulated 1.2V and 1.8V rails with fast transient response. IC Role / Device Role / Timing Role: Dual buck regulator supplies core and I/O domains; LDOs provide clean 2.8V for camera interface and 3.3V for SD card slot. Use Value: Factory-preset outputs eliminate feedback components; 1.5MHz switching allows small 2.2µH inductors; 100µA no-load current extends standby battery life. |
Use Scenario: Delivering stable, low-noise power to CMOS image sensors and ISP processors in compact handheld cameras. IC Role / Device Role / Timing Role: LDOs (OUT3/OUT4) supply sensor analog and digital rails; buck converters (OUT1/OUT2) power ISP and memory interfaces. Use Value: 75µVRMS LDO noise ensures minimal image sensor readout noise; independent EN3/EN4 enable synchronized sensor initialization. |
| Portable MP3 Player Audio | PDA System-on-Chip |
|
Use Scenario: Providing multiple voltage rails for audio DAC, headphone amplifier, flash memory, and display controller in battery-powered audio players. IC Role / Device Role / Timing Role: OUT1 powers CPU (1.2V), OUT2 powers memory (1.8V), OUT3 powers DAC (2.8V), OUT4 powers display driver (3.3V). Use Value: 1.7V LDO input range allows direct use of partially discharged Li-ion cells; 100µA no-load current maximizes playback time between charges. |
Use Scenario: Consolidating power delivery for legacy PDA SoCs with mixed 1.5V, 1.8V, 2.5V, and 3.3V requirements in space-constrained designs. IC Role / Device Role / Timing Role: Step-down converters generate primary logic rails; LDOs generate precision analog and interface voltages with low dropout. Use Value: Independent enables (EN1–EN4) support complex boot sequences; 3mm × 3mm QFN fits tight board areas; -40°C to +85°C rating ensures field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck+LDO PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8668ETEHR+ | Adjustable OUT1/OUT2 via FB1/FB2 pins; same pinout, package, and LDO section; requires external resistor dividers | Suitable when system requires programmable core voltages (e.g., dynamic voltage scaling) rather than fixed factory presets | Select MAX8668ETEHR+ only if adjustable outputs are needed; MAX8667ETEHR+ reduces BOM and layout complexity |
| TPS65023RGZR | Triple buck + dual LDO; 2.25V–6.5V input; different pinout; no exposed thermal pad; higher quiescent current (250µA) | Used in OMAP-based handhelds; lacks 1.5MHz switching and ultra-low-noise LDOs; wider input range but larger solution size | Choose TPS65023RGZR only for systems needing third buck rail; MAX8667ETEHR+ offers superior light-load efficiency and noise performance |
Compared with MAX8668ETEHR+, the MAX8667ETEHR+ eliminates external feedback components and simplifies design for fixed-voltage applications, while compared with TPS65023RGZR, it delivers lower no-load current, smaller footprint, and better LDO noise specs - making it optimal for compact, battery-sensitive portable devices.
Availability
MAX8667ETEHR+ is available at Aetrix Electronics and suitable for smartphone core power, digital camera sensor rail, portable MP3 player audio, and PDA system-on-chip applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MAX8667ETEHR+ 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 electronics requiring highly integrated, low-quiescent-current power solutions with independent rail control - targeting smartphones, PDAs, and digital imaging devices.
FAQ
What is the guaranteed output current for each regulator in the MAX8667ETEHR+?
The MAX8667ETEHR+ guarantees 600mA on step-down regulator OUT1 and 1200mA on OUT2 across the full -40°C to +85°C temperature range. Each LDO (OUT3 and OUT4) delivers 300mA with ±3% output voltage accuracy under 1mA–300mA load conditions. These values are production-tested and specified in the Absolute Maximum Ratings and Electrical Characteristics tables of the MAX8667ETEHR+ datasheet.
Does the MAX8667ETEHR+ require external feedback resistors to set output voltages?
No, the MAX8667ETEHR+ does not require external feedback resistors. As a MAX8667 variant, its step-down outputs (OUT1 and OUT2) are factory-preset to specific voltages (e.g., 1.2V and 1.8V), and its LDO outputs (OUT3 and OUT4) are also factory-preset (e.g., 2.8V and 3.3V). This eliminates the need for external resistor dividers, reducing BOM count and PCB area versus the adjustable MAX8668ETEHR+.
What is the minimum input voltage required for the LDO regulators in the MAX8667ETEHR+?
The LDO regulators (OUT3 and OUT4) in the MAX8667ETEHR+ operate with a minimum input voltage of 1.7V on the IN34 pin. This allows direct connection to partially discharged single-cell Li-ion batteries (down to ~2.7V) or low-voltage intermediate rails. The dropout voltage is 250mV maximum at 300mA load, so IN34 must exceed the LDO output voltage by at least that margin to avoid regulation loss.
How does the MAX8667ETEHR+ manage power sequencing between its four outputs?
The MAX8667ETEHR+ provides full power sequencing control via four independent enable inputs: EN1 (OUT1), EN2 (OUT2), EN3 (OUT3), and EN4 (OUT4). Each is active-high and can be driven directly from GPIOs or power-good signals. The first enabled output after shutdown incurs a longer power-on delay (tPWRON = 25µs), while subsequent enables have shorter delay (tEN = 15µs), enabling precise staggered startup to limit inrush current and meet system-level sequencing requirements.
What package type and thermal characteristics does the MAX8667ETEHR+ use?
The MAX8667ETEHR+ uses a 16-pin thin QFN package measuring 3mm × 3mm with an exposed thermal paddle (EP). At +70°C ambient, it supports 1667mW continuous power dissipation, derating linearly by 20.8mW/°C above that temperature. The EP must be soldered to a solid PCB ground plane to achieve specified thermal performance and EMI suppression - critical for reliable operation in compact portable enclosures.
MAX8667ETEHR+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Topology:
- Step-Down (Buck) Synchronous (2), Linear (LDO) (2)
- Number of Outputs:
- 4
- Frequency - Switching:
- 1.5MHz
- Voltage/Current - Output 1:
- 1.8V, 600mA
- Voltage/Current - Output 2:
- 1.2V, 1.2A
- Voltage/Current - Output 3:
- 2.6V, 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)
MAX8667ETEHR+ FAQ
1.How can I place an order for MAX8667ETEHR+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8667ETEHR+ 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 MAX8667ETEHR+ reliable?
The price and inventory of MAX8667ETEHR+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8667ETEHR+ is usually 5 days.
3.What payment methods are accepted for MAX8667ETEHR+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8667ETEHR+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8667ETEHR+?
MAX8667ETEHR+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8667ETEHR+ 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 MAX8667ETEHR+?
For technical support, including MAX8667ETEHR+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8667ETEHR+ requirements.
6.How does Aetrix verify that MAX8667ETEHR+ is sourced from the original manufacturer or authorized distributors?
All MAX8667ETEHR+ 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 MAX8667ETEHR+ meets industry standards.
7.What is the process for return or replacement of MAX8667ETEHR+?
All MAX8667ETEHR+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8667ETEHR+, 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 MAX8667ETEHR+ part is unused and in its original packaging.
Return procedure for MAX8667ETEHR+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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