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Analog Devices Inc./Maxim Integrated MAX8716ETG+
- Part No.:
- MAX8716ETG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX8716ETG+.pdf
- Description:
- IC REG CTRLR POWER 1OUT 24TQFN
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Product details
Overview
The MAX8716ETG+ from Maxim Integrated is a dual, interleaved, fixed-frequency synchronous step-down SMPS controller for notebook main power rails (3.3V/5V), featuring 40/60° phase shift, 200–500kHz selectable switching frequency, 4V–26V input range, and independent PWM/skip/low-noise mode control - deployed in battery-powered computing systems requiring high-efficiency, low-input-ripple DC-DC conversion.
For engineers reviewing the MAX8716ETG+ datasheet, MAX8716ETG+ pinout, MAX8716ETG+ application, or MAX8716ETG+ equivalent, key selection considerations include its 24-pin thin QFN package, dual-channel current-limit adjustability via ILIM1/ILIM2, 2V precision reference with ±0.75% accuracy, soft-start/soft-stop sequencing, and optimal interleaving for input-capacitor reduction in space-constrained 2–4 Li+ cell platforms.
Technical Context
The MAX8716ETG+ implements two independent, interleaved buck controllers with synchronous rectification, where SMPS2 starts 144° after SMPS1 to achieve 40/60° optimal interleaving - minimizing input ripple across 4V–26V VIN while enabling duty-cycle overlap only below 8.3V in 5V/3.3V applications. Its gate drivers feature DH1/DH2 (1.5–5Ω on-resistance) and DL1/DL2 (0.6–3Ω low-side on-resistance) supporting high-efficiency MOSFET drive.
Control architecture includes tri-level SKIP inputs (GND/PWM/REF), FSEL-selectable frequency (200/300/500kHz), Dual Mode™ feedback (fixed 3.3V/5V or adjustable 1V–5.5V), and integrated fault protection: overvoltage (±11–19%), undervoltage (65–75% threshold), thermal shutdown (+160°C), and PGOOD with 10µs propagation delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 26V - supports wide-input battery adapters and unregulated DC sources without pre-regulation. |
| Switching Frequency | 200kHz / 300kHz / 500kHz (FSEL-selectable) - enables EMI optimization and inductor size trade-offs. |
| Output Voltage Modes | Fixed 3.3V/5V or adjustable 1.0V–5.5V (Dual Mode™) - simplifies design for multiple rail requirements with single IC. |
| Reference Voltage | 2.00V ±0.75% - provides stable feedback reference for high-accuracy output regulation. |
| Current Limit Threshold | 50mV (fixed) or adjustable 0.5×VREF to VREF - enables precise, lossless inductor sensing with minimal PCB area. |
| Phase Shift | 144° between SMPS1 and SMPS2 - achieves 40/60° optimal interleaving for lowest possible input capacitor RMS current. |
| Soft-Start Time | 2ms (measured from ON_ rise to full-scale) - prevents inrush current damage to input capacitors and upstream supplies. |
Pinout & Package
The MAX8716ETG+ is housed in a 24-pin thin QFN package (4mm × 4mm, T2444-4), thermally enhanced with an exposed pad connected to AGND.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Analog supply input | 4.5V–5.5V bias for internal analog circuitry; requires RC filter from VDD and 1μF ceramic bypass. |
| SKIP1 (Pin 2) | SMPS1 operating mode control | Tri-level logic: GND = Idle Mode, VCC = PWM, REF = low-noise mode - selects light-load efficiency strategy. |
| REF (Pin 3) | Precision 2.0V reference output | Sources ≤50µA; used for FSEL/SKIP configuration and feedback scaling; shuts down when both ON1/ON2 are low. |
| SKIP2 (Pin 4) | SMPS2 operating mode control | Independent tri-level control identical to SKIP1 - enables asymmetric mode selection per channel. |
| FSEL (Pin 5) | Frequency select input | Four-level logic (GND/REF/VCC) sets 200/300/500kHz - determines switching loss vs. component size trade-off. |
| ON1 (Pin 6) | SMPS1 enable input | Active-high logic; controls soft-start initiation and power-good assertion for channel 1. |
| ON2 (Pin 7) | SMPS2 enable input | Independent active-high enable with dedicated PGOOD2 output - supports flexible power sequencing. |
| PGOOD2 (Pin 9) | SMPS2 power-good indicator | Open-drain output asserted high when output is within ±10% of regulation - used for system reset or sequencing. |
| FB2 (Pin 10) | SMPS2 feedback input | Connects to VCC for fixed 5V output or to divider for adjustable 1V–5.5V - sets regulation point with 1.005V typical threshold. |
| CSL2 (Pin 11) | SMPS2 current-sense negative input | Paired with CSH2 to measure inductor current; supports lossless sensing via external sense resistor or inductor DCR. |
| CSH2 (Pin 12) | SMPS2 current-sense positive input | Differential input with ±0.1µA bias current - enables accurate peak-current limiting and cycle-by-cycle protection. |
| BST2 (Pin 13) | SMPS2 bootstrap capacitor connection | Drives DH2 high-side gate; requires 0.1µF ceramic capacitor to LX2 - enables N-channel high-side MOSFET use. |
| DH2 (Pin 14) | SMPS2 high-side gate driver | Swings from LX2 to BST2; 1.5–5Ω on-resistance - delivers fast turn-on for high-efficiency synchronous rectification. |
| LX2 (Pin 15) | SMPS2 switch node | Connects to inductor and low-side MOSFET source; serves as return for DH2 driver - critical for EMI layout. |
| DL2 (Pin 16) | SMPS2 low-side gate driver | Swings from PGND to VDD; 0.6–3Ω low-state on-resistance - drives N-channel sync FET with minimal conduction loss. |
| VDD (Pin 17) | Gate-driver supply input | 5V supply for DL1/DL2 drivers; must be decoupled locally - separates power-switching noise from analog circuitry. |
| GND (Pin 18) | Power/analog ground | Single-pin combined AGND/PGND per MAX8716 datasheet Note 1 - requires low-impedance PCB plane connection. |
| DL1 (Pin 19) | SMPS1 low-side gate driver | Identical function to DL2; drives SMPS1 sync FET - enables dual synchronous buck with minimal external components. |
| LX1 (Pin 20) | SMPS1 switch node | Paired with LX2 for interleaved operation - differential placement reduces common-mode EMI. |
| DH1 (Pin 21) | SMPS1 high-side gate driver | Swings from LX1 to BST1; matched specs to DH2 - ensures balanced channel performance in dual-rail designs. |
| BST1 (Pin 22) | SMPS1 bootstrap capacitor connection | Functionally identical to BST2 - supports independent high-side drive for each channel. |
| CSH1 (Pin 23) | SMPS1 current-sense positive input | Differential pair with CSL1; same electrical specs as CSH2 - enables matched current limiting across both channels. |
| CSL1 (Pin 24) | SMPS1 current-sense negative input | Paired with CSH1; supports same sensing topologies - allows independent current monitoring per output. |
Key Features
| Feature | Design Value |
|---|---|
| 40/60° Optimal Interleaving | Reduces input capacitor RMS current by up to 50% versus 180° out-of-phase designs - cuts required bulk capacitance and cost. |
| Dual Mode™ Feedback | Supports fixed 3.3V/5V outputs or adjustable 1.0V–5.5V via single FB pin - eliminates need for external DAC or voltage-setting resistors in many cases. |
| Tri-Level SKIP Control | Enables dynamic selection of PWM, pulse-skipping (Idle Mode™), or low-noise mode per channel - optimizes efficiency vs. acoustic noise trade-off. |
| Lossless Inductor Current Sensing | Uses inductor DCR instead of sense resistor - saves board space, power loss, and BOM cost while maintaining accurate current limit. |
| Independent Soft-Start/Soft-Stop | 2ms ramp-up and 4ms ramp-down per channel - prevents negative voltage dips and inrush stress during power transitions. |
| 2V Precision Reference | ±0.75% accuracy over -40°C to +85°C - ensures stable feedback across temperature, improving output regulation tightness. |
Applications
| Notebook Main Power Supply | Subnotebook I/O Rail Generation |
|---|---|
Use Scenario: Generating 3.3V and 5V main rails from 2–4 Li+ battery pack (8.4V–16.8V) or AC adapter (12V–20V) in ultraportable notebooks. IC Role / Device Role / Timing Role: Dual-channel interleaved buck controller managing synchronous rectification, phase-shifted switching, and independent power sequencing. Use Value: 40/60° interleaving cuts input ripple by >40%, reducing required input capacitance by ~30% and enabling smaller, lower-cost ceramic caps. |
Use Scenario: Providing regulated 1.5V/1.8V I/O rails for PCIe, USB, or display interfaces in subnotebooks with strict thermal and size constraints. IC Role / Device Role / Timing Role: Dual SMPS controller with adjustable output (1.0V–2.3V for MAX8756 variant) and independent SKIP/FSEL control per channel. Use Value: Tri-level SKIP mode allows low-noise operation during audio playback while switching to PWM for CPU burst loads - preserving signal integrity. |
| Mobile Communicator Baseband Power | PDAs with Dual-Voltage Memory Interfaces |
Use Scenario: Delivering clean, sequenced 3.3V (RF section) and 1.8V (baseband processor) from shared Li+ battery in mobile communicators. IC Role / Device Role / Timing Role: Dual controller with independent ON1/ON2 enables staggered startup to avoid battery sag; PGOOD1/PGOOD2 feed system PMIC. Use Value: Independent soft-start (2ms) and soft-stop (4ms) prevent brownouts during modem handover or sleep/wake transitions. |
Use Scenario: Powering DDR/LPDDR memory requiring simultaneous 1.2V core and 2.5V I/O rails in legacy PDAs with aging battery packs. IC Role / Device Role / Timing Role: Fixed 3.3V/5V outputs configured for 2.5V I/O and 1.2V core via external resistor dividers on FB1/FB2 pins. Use Value: 2V reference with 0.75% accuracy ensures ±1.5% output tolerance - meets JEDEC DDR voltage margin requirements under load transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual interleaved buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8717ETI+ | 28-pin TQFN (5mm × 5mm); adds ILIM1/ILIM2 pins and FSEL for expanded configurability; same 200–500kHz range and 40/60° interleaving. | Targeted at higher-power notebooks requiring greater current-sense flexibility and thermal headroom. | Select MAX8717ETI+ when board layout allows larger package and ILIM adjustment is needed for custom current limits. |
| RT8205AZSP | Single-chip dual buck with integrated MOSFETs; 4.5V–24V input; fixed 1.05V/3.3V outputs; no FSEL or SKIP modes; 500kHz only. | Designed for cost-sensitive, lower-current embedded systems - lacks independent channel control and low-noise mode. | Choose RT8205AZSP only for simple, low-feature-count 3.3V/1.05V applications where integration outweighs configurability needs. |
Compared with MAX8717ETI+, the MAX8716ETG+ offers identical control architecture in a smaller 4mm × 4mm footprint but omits dedicated ILIM pins - making it ideal for space-constrained notebook mainboards where fixed 50mV current limit suffices. RT8205AZSP trades configurability for integration, eliminating external MOSFETs but forfeiting interleaving benefits and multi-mode operation.
Availability
The MAX8716ETG+ is available at Aetrix Electronics and suitable for notebook computers, subnotebook I/O power supplies, and mobile communicator baseband power systems requiring stable component supply, long-term lifecycle support, and lead-free compliance.
Supply support for MAX8716ETG+ 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 computing, communications, and industrial applications.
The MAX8716ETG+ belongs to Maxim's notebook power management product line, designed specifically for high-efficiency, low-EMI dual-rail DC-DC conversion in portable computing platforms with stringent size and thermal constraints.
FAQ
What is the maximum input voltage supported by the MAX8716ETG+?
The MAX8716ETG+ supports an absolute maximum input voltage of 26V on its VIN supply, with operational specification guaranteed from 4V to 26V. This range accommodates 2–4 Li+ battery packs (8.4V–16.8V), automotive-derived adapters, and universal AC/DC supplies - ensuring robust operation across diverse notebook power architectures. Exceeding 26V risks permanent damage per Absolute Maximum Ratings.
How does the 40/60° interleaving in the MAX8716ETG+ reduce input ripple compared to standard 180° interleaving?
The MAX8716ETG+ uses 40/60° phase shift (SMPS2 starts 144° after SMPS1) to minimize input capacitor RMS current across the full input range - especially critical below 10V. Unlike 180° interleaving, which causes duty-cycle overlap and ripple resurgence below 10V, the MAX8716ETG+ maintains optimal cancellation down to 8.3V in 5V/3.3V applications, reducing required input capacitance by up to 30% and enabling smaller ceramic solutions.
Can the MAX8716ETG+ generate adjustable output voltages, and what is the supported range?
Yes, the MAX8716ETG+ supports adjustable outputs via its Dual Mode™ architecture: both SMPS channels regulate to 1.005V at the FB pin, enabling output ranges of 1.0V–5.5V (for MAX8716/MAX8717/MAX8757) using external resistor dividers. This flexibility allows single-IC support for nonstandard rails like 2.5V I/O or 1.2V cores - without requiring separate regulators or DACs - while maintaining ±1% regulation accuracy over line/load/temperature.
What are the key differences between the SKIP, PWM, and low-noise modes in the MAX8716ETG+?
SKIP mode (SKIPx = GND) enables pulse-skipping (Idle Mode™) for highest light-load efficiency; PWM mode (SKIPx = VCC) forces fixed-frequency operation for predictable EMI; low-noise mode (SKIPx = REF) modulates frequency to keep switching outside the audible band (20Hz–20kHz) while retaining good efficiency. Each mode is independently selectable per channel - allowing hybrid strategies, e.g., PWM on 5V rail for CPU, low-noise on 3.3V for audio subsystem.
Does the MAX8716ETG+ require external current-sense resistors, or does it support lossless sensing?
The MAX8716ETG+ supports both methods: a 50mV fixed current-limit threshold using external sense resistors, or lossless inductor DCR sensing by connecting CSHx/CSLx across the inductor's parasitic resistance. DCR sensing eliminates power loss and board space associated with discrete resistors - critical for high-current notebook rails - while maintaining accurate cycle-by-cycle current limiting and overcurrent protection.
MAX8716ETG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX8716ETG+ FAQ
1.How can I place an order for MAX8716ETG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8716ETG+ 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 MAX8716ETG+ reliable?
The price and inventory of MAX8716ETG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8716ETG+ is usually 5 days.
3.What payment methods are accepted for MAX8716ETG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8716ETG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8716ETG+?
MAX8716ETG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8716ETG+ 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 MAX8716ETG+?
For technical support, including MAX8716ETG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8716ETG+ requirements.
6.How does Aetrix verify that MAX8716ETG+ is sourced from the original manufacturer or authorized distributors?
All MAX8716ETG+ 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 MAX8716ETG+ meets industry standards.
7.What is the process for return or replacement of MAX8716ETG+?
All MAX8716ETG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX8716ETG+, 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 MAX8716ETG+ part is unused and in its original packaging.
Return procedure for MAX8716ETG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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