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Analog Devices Inc./Maxim Integrated MAX77839DEFQ+
- Part No.:
- MAX77839DEFQ+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 11-UFQFN
- Datasheet:
-
MAX77839DEFQ+.pdf
- Description:
- LOW IQ BUCK-BOOST CONVERTER
- Quantity:
- Payment:
- Shipping:
Inventory:4,111
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Product details
Overview
The MAX77839DEFQ+ from Analog Devices is a high-efficiency buck-boost DC-DC converter optimized for single-cell Li-ion and low-voltage battery chemistries (≥1.8V discharge), delivering 2.3V–5.3V output at up to 3A continuous current with 6μA quiescent current. It features a 2.2MHz fixed-frequency current-mode control, dual switching current limits (3.6A typ for "C/D" variants), and POK open-drain GPIO functionality in an 11-lead FC2QFN package. It serves as a pre-regulator in compact portable electronics requiring seamless buck/boost transition.
For engineers reviewing the MAX77839DEFQ+ datasheet, MAX77839DEFQ+ pinout, MAX77839DEFQ+ application, or MAX77839DEFQ+ equivalent, key selection criteria include its 3.6A peak inductor current limit, POK output capability, 2.2MHz switching frequency for small external components, active output discharge, and thermal/overvoltage/overcurrent protections - all critical for battery-powered RF and sensing subsystems.
Technical Context
The MAX77839DEFQ+ implements a four-switch H-bridge buck-boost topology with current-mode PWM control, enabling smooth mode transitions without output discontinuity. Its proprietary algorithm executes four distinct switching phases (Φ1–Φ4) to manage energy transfer between input and output across varying VIN/VOUT ratios.
It supports two GPIO configurations: this variant ("D") provides a POK (Power-OK) open-drain output that asserts low when VOUT is within ±10% of target, while the SEL pin sets output voltage via a resistor divider. Protection includes cycle-by-cycle current limiting (3.6A typ), 150°C thermal shutdown with 15°C hysteresis, and 0.5V overvoltage detection between OUT and OUTS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports full discharge range of single-cell Li-ion, LiSOCl₂, and alkaline batteries. |
| Output Voltage Range | 2.3V to 5.3V - set by external RSEL resistor; enables precise rail generation for SoCs, RF amplifiers, or sensors. |
| Switching Current Limit | 3.6A (typ) - defines maximum inductor peak current for "C/D" options; determines minimum inductor saturation rating. |
| Quiescent Current | 6μA - enables multi-week standby in asset trackers and IoT nodes without compromising regulation. |
| Switching Frequency | 2.2MHz (typ) - allows use of compact 1μH inductors and reduces EMI filtering burden in space-constrained layouts. |
| GPIO Function | POK open-drain output - signals valid output voltage to host processor; requires external pull-up to system IO voltage. |
| Efficiency | 96% peak (VIN=3.6V, VOUT=3.3V) - minimizes thermal load and extends battery runtime in high-duty-cycle applications. |
Pinout & Package
The MAX77839DEFQ+ is housed in a 2.5mm × 2.0mm, 0.5mm pitch, 11-lead FC2QFN package with exposed thermal pad (PGND-connected). Pin assignments are validated per Analog Devices' official pin description table and functional diagrams.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Buck-boost input supply | Accepts 1.8V–5.5V; must be bypassed with dual 10μF X7R ceramics directly to PGND. |
| LX1, LX2 | Switching node terminals | Connect to opposite ends of 1μH inductor; require short, wide traces and minimal loop area to suppress EMI. |
| PGND | Power ground reference | Primary return path for high-current switching loops; connects to thermal pad and input/output capacitor grounds. |
| OUT | Regulated power output | Delivers 2.3V–5.3V at up to 3A; bypassed with dual 47μF X7R ceramics to PGND. |
| OUTS | Output voltage sense input | Connects directly to point-of-load for accurate regulation; isolated from noisy LX nodes. |
| SEL | Output voltage selection | Analog input; resistor-to-AGND sets VOUT per Table 1 (e.g., 0Ω → 3.3V). |
| GPIO | POK open-drain output | Asserts low when VOUT is within ±10% of target; requires external pull-up (e.g., 15kΩ to VIO). |
| EN | Enable control input | Active-high logic; 1.3V VIH threshold; internal 800kΩ pulldown ensures default disable. |
| BIAS | Internal bias supply | Must be bypassed with 2.2μF X7R ceramic to AGND; not for external loading. |
| AGND | Analog ground reference | Low-noise reference for feedback and bias circuits; connected to PGND at single point on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck-boost transition | Four-phase H-bridge operation eliminates output glitches during VIN crossing VOUT, critical for uninterrupted SoC power. |
| Active output discharge | Integrated 100Ω switch discharges output capacitor rapidly upon disable or fault, preventing residual voltage hold-up. |
| Configurable POK signaling | GPIO pin delivers system-ready indication with ±10% accuracy, simplifying power sequencing in multi-rail designs. |
| Ultra-low IQ skip mode | 6μA quiescent current with automatic light-load skip mode extends battery life without sacrificing transient response. |
| Robust protection suite | Includes UVLO (1.75V rising), OVP (0.5V OUT–OUTS), thermal shutdown (150°C), and cycle-by-cycle current limiting. |
Applications
| Asset Tracking / Fleet Management | 5G/2G/GSM Cellular Power |
|---|---|
Use Scenario: GPS/GNSS + cellular modem modules in battery-powered telematics units operating across wide temperature and voltage ranges. IC Role / Device Role / Timing Role: Primary system pre-regulator supplying stable 3.3V or 3.6V to modem and MCU from depleting Li-ion cell (2.8V–4.2V). Use Value: 6μA IQ extends months-long sleep cycles; seamless buck/boost maintains regulation during deep discharge; POK confirms rail readiness before modem wake-up. | Use Scenario: Power management for LTE-M/NB-IoT modems in smart meters and remote sensors where size and battery longevity are critical. IC Role / Device Role / Timing Role: High-efficiency intermediate regulator converting battery voltage to clean 3.3V for RF transceiver and baseband ICs. Use Value: 2.2MHz switching enables tiny 1μH inductor; 96% peak efficiency minimizes heat in sealed enclosures; POK synchronizes modem TX bursts. |
| RF Amplifier Supply | Smartphones ToF/Facial Recognition |
Use Scenario: Bias supply for GaAs or SiGe power amplifiers in portable wireless infrastructure or handheld radios. IC Role / Device Role / Timing Role: Low-noise, fast-transient buck-boost delivering 4.0V–5.0V at up to 3A to PA stages under dynamic load. Use Value: Four-switch architecture ensures <100ns line/load transient recovery; 3.6A ILIM supports high peak PA currents; active discharge prevents PA latch-up on shutdown. | Use Scenario: Power delivery to time-of-flight (ToF) sensor modules and 3D facial recognition systems in mobile devices. IC Role / Device Role / Timing Role: Compact, high-PSRR pre-regulator generating precise 2.8V or 3.0V for VCSEL drivers and image signal processors. Use Value: WLP/FC2QFN footprint fits tight camera module areas; 2.2MHz operation avoids AM band interference; SEL-resistor tuning matches exact sensor VDD requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX77839CEFQ+ | Same FC2QFN package and POK GPIO, but 3.6A ILIM (identical); differs only in ordering suffix - functionally identical to MAX77839DEFQ+. | No functional difference; both support same input/output ranges, protections, and POK behavior. | Select MAX77839CEFQ+ if preferred for inventory alignment; no design change required. |
| TPS63802DLAR | 2.5V–5.5V input, 1.8V–5.5V output, 2A max, 1.2MHz, no POK, FPWM-only GPIO; smaller 2.0mm × 2.0mm QFN. | Lacks POK output and higher current capability; suited for lower-power, cost-sensitive applications without sequencing needs. | Choose only if POK is unnecessary and 2A output suffices; requires redesign for GPIO and current handling. |
Compared with MAX77839CEFQ+, the MAX77839DEFQ+ offers identical electrical and mechanical performance; versus TPS63802DLAR, it provides higher output current (3A vs 2A), integrated POK signaling, and superior light-load efficiency due to ultra-low 6μA IQ - making it preferable for battery-critical, sequenced power systems.
Availability
MAX77839DEFQ+ is available at Aetrix Electronics and suitable for asset tracking, cellular IoT, RF amplifier biasing, and smartphone sensor power applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX77839DEFQ+ 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
Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and consumer markets.
The MAX77839 series is part of ADI's power management portfolio designed specifically for ultra-low-power, space-constrained battery-operated devices - emphasizing minimal quiescent current, seamless buck-boost operation, and flexible system integration via configurable GPIO and resistor-set outputs.
FAQ
What is the GPIO function of the MAX77839DEFQ+?
The MAX77839DEFQ+ uses the GPIO pin as a POK (Power-OK) open-drain output. When the regulated output voltage is within ±10% of the target value set by the SEL resistor, the GPIO pin pulls low. An external pull-up resistor (e.g., 15kΩ to VIO) is required. This behavior is confirmed for "B" and "D" variants in the official datasheet's Pin Description and Applications Information sections.
What is the switching current limit for the MAX77839DEFQ+?
The MAX77839DEFQ+ has a typical switching current limit of 3.6A, as specified for "C" and "D" options in the Electrical Characteristics table. This value defines the peak inductor current during normal operation and is used to select appropriate inductors with matching saturation ratings, such as the Cyntec HTEK20161T-1R0MSR recommended in the datasheet.
Does the MAX77839DEFQ+ support active output discharge?
Yes, the MAX77839DEFQ+ integrates an active output discharge function using an internal 100Ω switch between OUT and PGND. This switch activates automatically when the device is disabled via EN or latched off by protection events (e.g., thermal shutdown), ensuring rapid discharge of the output capacitor to prevent residual voltage and enable safe downstream sequencing.
What package type does the MAX77839DEFQ+ use?
The MAX77839DEFQ+ is packaged in an 11-lead FC2QFN (Fine-Pitch Chip-Scale Quad Flat No-Lead) measuring 2.5mm × 2.0mm with 0.5mm pitch and an exposed thermal pad. This package is explicitly listed in the Ordering Information table and Package Information section, and its pinout matches the FC2QFN diagram on page 9 of the datasheet.
How is the output voltage set on the MAX77839DEFQ+?
The output voltage of the MAX77839DEFQ+ is set by connecting a resistor (RSEL) between the SEL pin and AGND. The resistance value determines VOUT per the RSEL Selection Table (e.g., 0Ω yields 3.3V; 4.99kΩ yields 2.3V). The datasheet specifies 1% tolerance resistors and provides 33 discrete VOUT options from 2.3V to 5.3V, with interpolation possible for intermediate values.
MAX77839DEFQ+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 11-UFQFN
- Packaging:
- Strip
- Product Status:
- Active
- Applications:
- Converter, Battery Powered Devices
- Voltage - Input:
- 5.5V
- Number of Outputs:
- 1
- Voltage - Output:
- 2.3V ~ 5.3V
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 11-FC2QFN (2.5x2)
MAX77839DEFQ+ FAQ
1.How can I place an order for MAX77839DEFQ+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77839DEFQ+ 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 MAX77839DEFQ+ reliable?
The price and inventory of MAX77839DEFQ+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77839DEFQ+ is usually 5 days.
3.What payment methods are accepted for MAX77839DEFQ+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77839DEFQ+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77839DEFQ+?
MAX77839DEFQ+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77839DEFQ+ 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 MAX77839DEFQ+?
For technical support, including MAX77839DEFQ+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77839DEFQ+ requirements.
6.How does Aetrix verify that MAX77839DEFQ+ is sourced from the original manufacturer or authorized distributors?
All MAX77839DEFQ+ 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 MAX77839DEFQ+ meets industry standards.
7.What is the process for return or replacement of MAX77839DEFQ+?
All MAX77839DEFQ+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX77839DEFQ+, 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 MAX77839DEFQ+ part is unused and in its original packaging.
Return procedure for MAX77839DEFQ+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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