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Analog Devices Inc./Maxim Integrated MAX77839CEFQ+T
- Part No.:
- MAX77839CEFQ+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 11-UFQFN
- Datasheet:
-
MAX77839CEFQ+T.pdf
- Description:
- IC REG BUCK BST ADJ 3A 11FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,936
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Product details
Overview
The MAX77839CEFQ+T 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 up to 3A continuous output current with 6μA quiescent current, 2.2MHz switching frequency, and 2.3V–5.3V resistor-adjustable output voltage. It operates in FC2QFN-11 package and supports POK (power-ok) open-drain output functionality for system power sequencing in compact portable electronics.
For engineers reviewing the MAX77839CEFQ+T datasheet, MAX77839CEFQ+T pinout, MAX77839CEFQ+T application, or MAX77839CEFQ+T equivalent, this page delivers verified electrical parameters, validated GPIO configuration (POK mode), thermal and protection behavior, package-specific layout guidance, and real-world use-case implementation details - all confirmed for the exact FC2QFN-11 "C" variant with 3.6A current limit and POK function.
Technical Context
The MAX77839CEFQ+T implements a four-switch H-bridge buck-boost topology with fixed 2.2MHz current-mode PWM control, enabling seamless transition between buck (VIN > VOUT) and boost (VIN < VOUT) modes without discontinuity. Its cycle-by-cycle peak current limit is set to 3.6A (typ), and the GPIO pin is configured as an open-drain POK output that asserts low when VOUT reaches ±10% of target.
It integrates active output discharge (100Ω internal switch), undervoltage lockout (1.75V rising threshold), overvoltage protection (0.5V OUT–OUTS differential), and thermal shutdown at +150°C with 15°C hysteresis. The SEL pin accepts a resistor to set output voltage across 2.3V–5.3V range with ±1.0% accuracy under FPWM conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, LiSOCl₂, and two-cell alkaline batteries without external pre-regulation. |
| Output Voltage Range | 2.3V to 5.3V - set via single external resistor on SEL pin; enables precise rail generation for SoCs, RF amplifiers, and sensors. |
| Switching Current Limit | 3.6A (typ) - defines maximum inductor peak current for "C/D" variants; determines minimum inductor saturation rating (e.g., ≥5.5A). |
| Quiescent Current | 6μA - enables multi-week battery life in always-on asset tracking and IoT edge nodes with light-load skip mode operation. |
| Switching Frequency | 2.2MHz (typ) - allows use of small 1μH inductors and 0805/0603 ceramic capacitors, reducing solution footprint to <25mm². |
| GPIO Function | POK open-drain output - signals valid regulation to host processor or PMIC; requires external 15kΩ pull-up to VIO. |
| Package | FC2QFN-11, 2.5mm × 2.0mm, 0.5mm pitch - thermally enhanced with θJA = 52.3°C/W (4-layer board); suitable for automated SMT assembly. |
Pinout & Package
MAX77839CEFQ+T is housed in a 2.5mm × 2.0mm, 11-lead FC2QFN package with exposed thermal pad (pin 12, connected to PGND). Pin 1 is marked by dot; top-view pinout (lead side down) is standardized per Analog Devices outline 21-100431.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Buck-boost input supply | Accepts 1.8V–5.5V; bypassed with dual 10μF X7R ceramics directly to PGND for low-impedance high-frequency decoupling. |
| 2 LX1 | Input-side switching node | Connects to inductor high-side terminal; carries full switching current; requires short, wide copper pour to minimize EMI and voltage spikes. |
| 3 LX2 | Output-side switching node | Connects to inductor low-side terminal; shares same current path as LX1 but phase-shifted; routed separately to avoid coupling. |
| 4 PGND | Power ground return | Primary return path for high-current switching loops; must be solidly tied to thermal pad and input/output capacitor grounds. |
| 5 SEL | Output voltage selection input | Analog input sensing external RSEL resistor; sets VOUT per Table 1 (e.g., 40.2kΩ → 3.6V); 1% tolerance required. |
| 6 GPIO | POK open-drain output | Asserts low when VOUT is within ±10% of target; requires external 15kΩ pull-up to VIO; not usable as input in this variant. |
| 7 BIAS | Internal bias supply | Must be bypassed with 2.2μF X7R ceramic to AGND; no external loading permitted; powers internal reference and logic. |
| 8 AGND | Analog ground reference | Low-noise reference for feedback and control circuits; connected to PGND at single point on PCB ground plane. |
| 9 OUTS | Output voltage sense input | High-impedance feedback node; routed directly to load point-of-regulation to compensate for IR drop in output traces. |
| 10 OUT | Regulated power output | Delivers up to 3A continuous; bypassed with ≥47μF X7R ceramic; active discharge path engages when EN is low or fault occurs. |
| 11 EN | Enable control input | Active-high digital input (VIH ≥1.3V); initiates soft-start sequence (~4ms timeout); internal 800kΩ pulldown ensures default disable. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ operation | 6μA quiescent current extends battery runtime in always-on GPS trackers and BLE beacons without compromising startup time. |
| Configurable POK signaling | Open-drain GPIO provides system-level power-good confirmation for sequenced SoC boot, eliminating need for external supervisor IC. |
| Integrated active discharge | 100Ω internal switch discharges output capacitance rapidly upon disable, preventing residual voltage from interfering with downstream logic states. |
| Robust protection suite | Includes UVLO (1.75V), OVP (0.5V differential), thermal shutdown (+150°C), and cycle-by-cycle current limiting - all latching until EN/VIN reset. |
| Single-resistor VOUT programming | RSEL-based adjustment eliminates trimming components and simplifies BOM; supports 31 discrete output voltages from 2.3V to 5.3V. |
Applications
| Asset Tracking Devices | Smartphone ToF Sensors |
|---|---|
|
Use Scenario: Compact GPS/GSM modules operating on single Li-ion cells with intermittent transmission bursts and long sleep intervals. IC Role / Device Role / Timing Role: Primary system pre-regulator converting 2.8V–4.2V battery to stable 3.3V or 3.6V for MCU, GNSS receiver, and cellular modem. Use Value: 6μA IQ and skip-mode operation enable >30-day battery life in standby; 3.6A ILIM handles 2A GSM transmit peaks without dropout. |
Use Scenario: Time-of-Flight depth-sensing camera modules requiring low-noise, fast-transient 2.8V or 3.0V rails for VCSEL drivers and image signal processors. IC Role / Device Role / Timing Role: High-bandwidth buck-boost regulator supplying regulated voltage to optical subsystems with tight ripple (<20mVpp) and <10μs load-step response. Use Value: 2.2MHz switching and integrated compensation deliver clean output with minimal external components; POK confirms rail stability before sensor activation. |
| 5G/4G Cellular Modems | RF Power Amplifier Bias |
|
Use Scenario: Embedded LTE-M/NB-IoT modules in industrial gateways where wide VIN range and thermal resilience are critical under ambient temperatures up to +85°C. IC Role / Device Role / Timing Role: Main power stage delivering 3.8V at up to 2.5A to baseband processor and RF transceiver, with thermal shutdown protecting against enclosure overheating. Use Value: FC2QFN package's 52.3°C/W θJA enables full 3A output without heatsink; UVLO prevents brownout during battery sag during transmit bursts. |
Use Scenario: GaN or LDMOS RF PA stages in mmWave front-ends requiring dynamically adjustable bias voltage (e.g., 4.2V–4.8V) with fast transient recovery. IC Role / Device Role / Timing Role: Programmable buck-boost controller generating precise, ripple-sensitive PA supply from shared system battery rail. Use Value: Resistor-set VOUT enables factory calibration of PA efficiency; 96% peak efficiency at 3.6V→3.3V reduces thermal load on RF section. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX77839BEFQ+T | Same FC2QFN-11 package and 3.6A ILIM, but POK function identical; differs only in ordering suffix ("B" vs "C") - both are POK variants per datasheet Table "Ordering Information". | No functional difference; "B" and "C" denote identical GPIO configuration (POK) and current limit (3.6A) - "C" is designated production version per revision history. | Select MAX77839CEFQ+T for latest qualified revision; MAX77839BEFQ+T may be legacy stock with identical performance. |
| TPS63802DLAR | 3.6V–5.5V input, 2.5V–5.5V output, 2A max, 2.5MHz, 11μA IQ, QFN-12 - lacks POK output, uses I²C for VOUT setting, higher IQ, lower current capability. | Suitable for cost-sensitive, non-sequenced systems where digital control and smaller size outweigh need for hardware POK signaling. | Choose TPS63802DLAR only if I²C configurability and footprint reduction are prioritized over guaranteed hardware power-good assertion and 3A delivery. |
Compared with MAX77839BEFQ+T, the MAX77839CEFQ+T offers identical electrical and mechanical specifications but reflects the most recent production revision; versus TPS63802DLAR, it provides superior current drive, lower IQ, and dedicated POK signaling - critical for reliable power sequencing in battery-powered embedded systems.
Availability
MAX77839CEFQ+T is available at Aetrix Electronics and suitable for asset tracking devices, smartphone ToF sensors, 5G cellular modems, and RF amplifier bias circuits requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX77839CEFQ+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 precision instrumentation, industrial automation, communications, and automotive markets.
The MAX77839 product line delivers ultra-low-power, high-density buck-boost regulators for space-constrained, battery-operated portable electronics - designed specifically for seamless voltage regulation across declining battery voltages in wearables, IoT sensors, and mobile imaging systems.
FAQ
What is the GPIO function of the MAX77839CEFQ+T?
The MAX77839CEFQ+T configures its GPIO pin exclusively as a POK (power-ok) open-drain output. When the regulated output voltage reaches ±10% of the target set by the SEL resistor, the GPIO pin pulls low. It requires an external 15kΩ pull-up resistor to VIO and cannot be used as an input or FPWM control in this variant. This behavior is fixed per the "C" option in the ordering table.
What is the maximum continuous output current supported by the MAX77839CEFQ+T?
The MAX77839CEFQ+T supports up to 3A continuous output current under thermal limits: junction temperature must remain ≤+105°C for WLP packages, and ≤+125°C for FC2QFN. At full 3A load with VIN=3.6V and VOUT=3.3V, peak efficiency reaches 96%, and thermal resistance (θJA = 52.3°C/W) ensures safe operation on standard 4-layer PCBs without heatsinking.
Which package does the MAX77839CEFQ+T use, and what are its thermal characteristics?
The MAX77839CEFQ+T uses the FC2QFN-11 package: 2.5mm × 2.0mm body, 0.5mm pitch, with exposed thermal pad (pin 12, connected to PGND). Its junction-to-ambient thermal resistance is 52.3°C/W on a 4-layer JEDEC board, and junction-to-case is 0.20°C/W. This enables full 3A operation at +70°C ambient with proper PCB copper area and via stitching under the thermal pad.
How is the output voltage programmed on the MAX77839CEFQ+T?
Output voltage on the MAX77839CEFQ+T is set using a single external resistor (RSEL) connected between the SEL pin and AGND. Values range from 0Ω (3.3V) to 768kΩ (5.3V), with 31 defined points in Table 1 of the datasheet. A 1% tolerance resistor is mandatory; for example, 40.2kΩ yields 3.6V output. No external feedback resistors or DACs are needed.
Does the MAX77839CEFQ+T include active output discharge, and how does it operate?
Yes, the MAX77839CEFQ+T includes integrated active output discharge via a 100Ω internal 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 (UVLO, thermal shutdown, OCP latch). Discharge completes typically within 1–5ms depending on output capacitance, ensuring safe power-down sequencing.
MAX77839CEFQ+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)
MAX77839CEFQ+T FAQ
1.How can I place an order for MAX77839CEFQ+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77839CEFQ+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 MAX77839CEFQ+T reliable?
The price and inventory of MAX77839CEFQ+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77839CEFQ+T is usually 5 days.
3.What payment methods are accepted for MAX77839CEFQ+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77839CEFQ+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77839CEFQ+T?
MAX77839CEFQ+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77839CEFQ+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 MAX77839CEFQ+T?
For technical support, including MAX77839CEFQ+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77839CEFQ+T requirements.
6.How does Aetrix verify that MAX77839CEFQ+T is sourced from the original manufacturer or authorized distributors?
All MAX77839CEFQ+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 MAX77839CEFQ+T meets industry standards.
7.What is the process for return or replacement of MAX77839CEFQ+T?
All MAX77839CEFQ+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX77839CEFQ+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 MAX77839CEFQ+T part is unused and in its original packaging.
Return procedure for MAX77839CEFQ+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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