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Analog Devices Inc./Maxim Integrated MAX77839DEFQ+T
- Part No.:
- MAX77839DEFQ+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 11-UFQFN
- Datasheet:
-
MAX77839DEFQ+T.pdf
- Description:
- IC REG BUCK BST ADJ 3A 11FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,019
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Product details
Overview
The MAX77839DEFQ+T from Analog Devices is a high-efficiency, 4-switch buck-boost DC-DC converter optimized for single-cell Li-ion and low-voltage battery systems. It delivers up to 3A continuous output current with 6μA quiescent current, 2.2MHz switching frequency, and supports 1.8V–5.5V input and 2.3V–5.3V adjustable output - used in smartphones for ToF facial recognition power rail regulation.
For engineers reviewing the MAX77839DEFQ+T datasheet, MAX77839DEFQ+T pinout, MAX77839DEFQ+T application, or MAX77839DEFQ+T equivalent, key selection considerations include its POK open-drain GPIO function (B/D option), 3.6A typical switching current limit, FC2QFN-11 package, active output discharge, and seamless buck-boost mode transition under dynamic load conditions.
Technical Context
The MAX77839DEFQ+T implements a four-switch H-bridge architecture with current-mode PWM control at 2.2MHz (typ), enabling fast transient response and small external components. Its proprietary phase sequencing (Φ1–Φ4) dynamically selects buck or boost operation based on VIN/VOUT relationship, ensuring stable regulation across 1.8V–5.5V input range.
This variant (D option) configures the GPIO pin as an open-drain Power-OK (POK) output that asserts low when VOUT is within ±10% of target, and uses the 3.6A (typ) inductor peak current limit. It integrates cycle-by-cycle overcurrent protection, thermal shutdown at +150°C, UVLO with 70mV hysteresis, and active discharge via internal 100Ω switch.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports full discharge of single-cell Li-ion (down to 1.8V) and multi-chemistry batteries without external pre-regulation. |
| Output Voltage Range | 2.3V to 5.3V - set by single resistor (RSEL) on SEL pin; enables precise system rail tuning without DAC or digital interface. |
| Switching Current Limit | 3.6A (typ) - defines maximum inductor peak current for D-option; determines minimum inductor saturation rating and PCB trace sizing. |
| Quiescent Current | 6μA - enables >10-year shelf life in asset tracking devices; critical for always-on, low-duty-cycle IoT sensors. |
| Switching Frequency | 2.2MHz (typ) - allows use of compact 1μH inductors and reduces output ripple; avoids AM radio band interference. |
| GPIO Function | POK open-drain output - provides system-level power-good signaling for sequenced enable of downstream LDOs or processors. |
| Package | FC2QFN-11, 2.5mm × 2.0mm, 0.5mm pitch - thermally enhanced QFN with exposed PGND pad; θJA = 52.3°C/W (4-layer board). |
Pinout & Package
MAX77839DEFQ+T is housed in a 2.5mm × 2.0mm, 11-lead FC2QFN package with exposed thermal pad (PGND). Pin assignments are validated per Analog Devices' official datasheet Rev 2 (Jan 2022), page 9 and 10.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Buck-boost input supply | Accepts 1.8V–5.5V battery or adapter input; requires dual 10μF X7R ceramic bypass capacitors directly at pin. |
| LX1 | Input-side switching node | Connects to one end of power inductor; high di/dt node requiring short, wide copper traces and minimal loop area. |
| LX2 | Output-side switching node | Connects to other end of power inductor; shares same layout constraints as LX1 for EMI and efficiency. |
| PGND | Power ground return | Primary high-current return path for IN, LX1, LX2, OUT; must connect to large low-impedance ground plane. |
| SEL | Output voltage selection | Analog input setting VOUT via resistor-to-ground; value determines regulation point 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) for logic-level signaling. |
| BIAS | Internal bias supply | Powers internal regulators; must be bypassed with 2.2μF X7R capacitor close to pin; no external loading permitted. |
| AGND | Analog ground reference | Low-noise reference for feedback and sensing; connected to PGND at single point on PCB to avoid noise coupling. |
| OUTS | Output voltage sense | High-impedance feedback input; routed directly to point-of-load to compensate for IR drop in output traces. |
| OUT | Regulated power output | Delivers up to 3A continuous; requires dual 47μF X7R ceramic output capacitors placed adjacent to pin. |
| EN | Enable control input | Active-high logic input (VIH ≥ 1.3V); controls startup/shutdown and initiates soft-start sequence upon rising edge. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck-boost transition | Eliminates output voltage discontinuity during VIN crossing VOUT; maintains regulation without external intervention or firmware control. |
| Active output discharge | Internal 100Ω switch discharges output capacitor to PGND within milliseconds after EN deassertion or fault latch-off. |
| Configurable POK signaling | GPIO pin functions as system-level power-good indicator, enabling safe sequencing of downstream rails in multi-rail SoC designs. |
| Ultra-low IQ skip mode | 6μA quiescent current in light-load skip mode extends battery runtime in standby; FPWM option disabled in this D-variant. |
| Integrated protections | Includes UVLO (1.75V rising), OVP (0.5V over OUT–OUTS), thermal shutdown (+150°C), and cycle-by-cycle current limiting. |
Applications
| Smartphone ToF/Facial Recognition | Asset Tracking/Fleet Management |
|---|---|
Use Scenario: Powers time-of-flight sensor modules requiring stable 3.3V or 3.6V rail during brief, high-current illumination pulses. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering regulated output with <10μs transient recovery and no mode-switching glitch. Use Value: Enables accurate depth mapping by maintaining tight output voltage tolerance (±1%) during rapid load steps up to 2A. |
Use Scenario: Supplies GPS/GSM modem in battery-powered telematics units operating across wide temperature and voltage ranges. IC Role / Device Role / Timing Role: System pre-regulator converting decaying 1.8V–4.2V Li-ion voltage to fixed 3.3V for RF and baseband ICs. Use Value: Extends operational battery life by 30% vs. traditional boost-only solutions due to 96% peak efficiency in both buck and boost regions. |
| 5G/2G/GSM Cellular Power | RF Amplifier Bias Supply |
Use Scenario: Provides clean, low-noise 4.2V bias for cellular transceiver PA stages in compact handheld devices. IC Role / Device Role / Timing Role: High-frequency (2.2MHz) buck-boost generating stable output despite GSM burst current demands (up to 3A peak). Use Value: Reduces required output capacitance by 40% versus 500kHz converters, saving PCB area in antenna-proximate layouts. |
Use Scenario: Generates adjustable 2.8V–4.8V bias voltage for GaAs or GaN RF power amplifiers in portable test equipment. IC Role / Device Role / Timing Role: Precision-adjustable regulator using RSEL resistor network to match amplifier VDD requirements without trimming. Use Value: Achieves ±1% output accuracy over -40°C to +125°C, ensuring consistent PA gain and linearity across environmental extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63900DSKR | Lower IQ (75nA), but fixed 3.3V/5V outputs only; no RSEL adjustment; 2.5A max output; 1.8V–5.5V input. | Lacks programmable output and POK signal; suited for ultra-low-power always-on monitoring, not dynamic rail tuning. | Select TPS63900DSKR only if fixed output and nanowatt IQ outweigh need for voltage flexibility and system sequencing. |
| RTQ2132BWGE | Higher ILIM (5A), 2.4MHz switching, but no POK output; includes I²C interface for dynamic voltage scaling; 3A continuous. | Requires MCU interaction for configuration; adds software overhead but enables adaptive power management. | Choose RTQ2132BWGE when digital control and higher current headroom justify added complexity and BOM cost. |
Compared with TPS63900DSKR and RTQ2132BWGE, the MAX77839DEFQ+T uniquely balances ultra-low IQ, analog-programmable output, and hardware-based POK signaling - making it optimal for space-constrained, battery-sensitive systems needing deterministic power sequencing without firmware dependency.
Availability
MAX77839DEFQ+T is available at Aetrix Electronics and suitable for smartphone ToF modules, asset tracking units, cellular modems, and RF amplifier bias supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX77839DEFQ+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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and consumer markets.
The MAX77839 series belongs to Analog Devices' power management portfolio designed specifically for ultra-low-power, high-density battery-powered applications - emphasizing minimal quiescent current, seamless mode transitions, and robust protection in miniature packages.
FAQ
What is the GPIO function of the MAX77839DEFQ+T?
The MAX77839DEFQ+T configures its GPIO pin as an open-drain Power-OK (POK) output. When enabled, it pulls low when the regulated output voltage is within ±10% of the target set by the RSEL resistor. This signal is used for system-level power sequencing and must be externally pulled up (e.g., with a 15kΩ resistor to VIO) to generate a valid logic-high level when regulation is achieved. The MAX77839DEFQ+T does not support FPWM mode - that functionality is reserved for A/C variants.
What package and pin count does the MAX77839DEFQ+T use?
The MAX77839DEFQ+T uses a 2.5mm × 2.0mm, 11-lead FC2QFN package with an exposed thermal pad connected to PGND. It has 11 functional pins: IN, LX1, LX2, PGND, SEL, GPIO, BIAS, AGND, OUTS, OUT, and EN. This package offers superior thermal performance (θJA = 52.3°C/W on a 4-layer board) compared to the WLP variant and is optimized for automated assembly and high-reliability applications.
How is the output voltage set on the MAX77839DEFQ+T?
The output voltage of the MAX77839DEFQ+T is set by connecting a precision resistor (RSEL) between the SEL pin and AGND. The device reads this resistance during startup to determine the target output voltage, with values ranging from 0Ω (3.3V) to 768kΩ (5.3V) per the official RSEL selection table. A 1% tolerance resistor is required for ±1% output accuracy. No external DAC or digital interface is needed - the MAX77839DEFQ+T performs fully analog voltage programming.
Does the MAX77839DEFQ+T support active output discharge?
Yes, the MAX77839DEFQ+T includes integrated active output discharge via an internal 100Ω switch between OUT and PGND. This switch activates automatically whenever the device is disabled - either by pulling EN low or due to a fault condition (e.g., thermal shutdown or UVLO). Discharge occurs within milliseconds, safely dissipating stored energy in the output capacitor and preventing unintended back-powering of downstream circuitry.
What is the switching current limit for the MAX77839DEFQ+T?
The MAX77839DEFQ+T is a "D" option device with a typical switching current limit (ILIM) of 3.6A, verified per Electrical Characteristics table on page 4 of the datasheet. This value defines the peak inductor current threshold for cycle-by-cycle overcurrent protection and determines minimum inductor saturation rating. During soft-start, ILIM is reduced to 1.6A (typ) to limit inrush current. The 3.6A rating applies to both buck and boost modes.
MAX77839DEFQ+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 11-UFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.3V
- Voltage - Output (Max):
- 5.3V
- Current - Output:
- 3A
- Frequency - Switching:
- 2.2MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 11-FC2QFN (2.5x2)
MAX77839DEFQ+T FAQ
1.How can I place an order for MAX77839DEFQ+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77839DEFQ+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 MAX77839DEFQ+T reliable?
The price and inventory of MAX77839DEFQ+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77839DEFQ+T is usually 5 days.
3.What payment methods are accepted for MAX77839DEFQ+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77839DEFQ+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77839DEFQ+T?
MAX77839DEFQ+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77839DEFQ+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 MAX77839DEFQ+T?
For technical support, including MAX77839DEFQ+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77839DEFQ+T requirements.
6.How does Aetrix verify that MAX77839DEFQ+T is sourced from the original manufacturer or authorized distributors?
All MAX77839DEFQ+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 MAX77839DEFQ+T meets industry standards.
7.What is the process for return or replacement of MAX77839DEFQ+T?
All MAX77839DEFQ+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX77839DEFQ+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 MAX77839DEFQ+T part is unused and in its original packaging.
Return procedure for MAX77839DEFQ+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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