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Analog Devices Inc./Maxim Integrated MAX77839BEFQ+T
- Part No.:
- MAX77839BEFQ+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 11-UFQFN
- Datasheet:
-
MAX77839BEFQ+T.pdf
- Description:
- IC REG BUCK BST ADJ 3A 11FC2QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
The MAX77839BEFQ+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. It operates across 1.8V–5.5V input and supports 2.3V–5.3V output via single-resistor programming, featuring POK open-drain GPIO functionality and integrated protections including UVLO, OVP, cycle-by-cycle current limit, and thermal shutdown. It targets compact, battery-sensitive applications such as asset tracking and smartphone ToF sensors.
For engineers reviewing the MAX77839BEFQ+T datasheet, MAX77839BEFQ+T pinout, MAX77839BEFQ+T application, or MAX77839BEFQ+T equivalent, key selection criteria include its 3.6A switching current limit (Option B), FC2QFN-11 package footprint, POK output behavior, active discharge capability, and seamless buck-boost transition at 2.2MHz fixed frequency.
Technical Context
The MAX77839BEFQ+T implements a four-switch H-bridge buck-boost topology with current-mode PWM control at 2.2MHz typical switching frequency. Its proprietary algorithm dynamically sequences four phases (Φ1–Φ4) to enable smooth mode transitions without discontinuity in regulation or output ripple.
It integrates dual MOSFET drivers with 50mΩ high-side and 58mΩ low-side RDS(ON), supports skip mode for light-load efficiency, and uses SEL-pin resistor programming for precise output voltage setting. The GPIO pin functions exclusively as an open-drain POK output (±10% window) per Option B specification, not as FPWM input.
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 two-cell alkaline batteries. |
| Output Voltage Range | 2.3V to 5.3V - set by external RSEL resistor; enables direct supply for USB OTG, RF amplifiers, or SoC I/O rails. |
| Switching Current Limit | 3.6A (typ) - defines maximum peak inductor current for Option B; constrains inductor saturation and PCB trace sizing. |
| Quiescent Current | 6μA - minimizes standby power loss in always-on battery-powered devices like trackers or sensors. |
| Switching Frequency | 2.2MHz (typ) - allows use of small 1μH inductors and reduces EMI filtering requirements. |
| Package | FC2QFN-11, 2.5mm × 2.0mm, 0.5mm pitch - thermally enhanced QFN with exposed PGND pad for industrial-grade thermal performance (θJA = 52.3°C/W). |
| GPIO Function | POK open-drain output - asserts low when VOUT is within ±10% of target; used for system power sequencing and fault signaling. |
Pinout & Package
MAX77839BEFQ+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 pin description table and functional diagrams.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Buck-boost input rail | Accepts 1.8V–5.5V; requires dual 10μF X7R ceramic bypass capacitors close to pins A5/B5. |
| OUT | Regulated power output | Delivers 2.3V–5.3V at up to 3A; connects to load via low-impedance path and OUTS sense point. |
| LX1, LX2 | Switching nodes | High-dV/dt nodes connecting to inductor; require short, wide traces and minimal loop area to reduce EMI and voltage spikes. |
| PGND | Power ground return | Primary return path for high-current switching loops; must connect directly to thermal pad and input/output capacitor grounds. |
| AGND | Analog reference ground | Low-noise reference for error amplifier and feedback; tied to PGND at single point on PCB ground plane. |
| EN | Enable control input | Active-high digital input; 1.3V logic-high threshold; internal 800kΩ pulldown ensures default disable state. |
| GPIO | POK open-drain output | Asserts low when regulated output is within ±10% of target; requires external pull-up to VIO (e.g., 15kΩ to 3.3V). |
| SEL | Output voltage selection | Analog input sensing external RSEL; sets VOUT via internal DAC; 1% tolerance resistor required for accuracy. |
| OUTS | Remote output voltage sense | Connects to point-of-load to compensate for IR drop; improves regulation accuracy under dynamic load conditions. |
| BIAS | Internal bias supply | Provides regulated internal voltage; bypassed with 2.2μF X7R capacitor to AGND; no external loading permitted. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck-boost transition | Eliminates output voltage discontinuity during VIN crossing VOUT; maintains regulation without external intervention or control logic. |
| Active output discharge | Integrated 100Ω switch discharges output capacitor rapidly upon disable or fault, preventing residual voltage hold-up in safety-critical systems. |
| Configurable POK output | Provides system-level power-good signaling with ±10% accuracy window; eliminates need for external supervisor IC in space-constrained designs. |
| Ultra-low IQ skip mode | Reduces supply current to 6μA at light loads while maintaining regulation; extends battery runtime in intermittent-usage applications. |
| Robust protection suite | Includes UVLO (1.75V rising), OVP (0.5V overvoltage detection), thermal shutdown (150°C), and cycle-by-cycle current limiting (3.6A typ). |
Applications
| Asset Tracking / Fleet Management | Smartphones ToF / Facial Recognition |
|---|---|
Use Scenario: GPS/GSM module powered from single-cell Li-ion battery with deep discharge down to 1.8V. IC Role / Device Role / Timing Role: Primary pre-regulator supplying stable 3.3V/5.0V to modem and sensor subsystems across full battery voltage range. Use Value: Enables >2-week battery life in sleep mode via 6μA IQ and seamless buck-boost operation below 3.0V input. | Use Scenario: Time-of-Flight depth sensor requiring clean, fast-transient 3.3V supply during burst illumination cycles. IC Role / Device Role / Timing Role: High-efficiency, low-noise power stage delivering 3A peak current with <10μs load transient response. Use Value: Maintains regulation during 100mA–3A load steps without droop or overshoot, ensuring accurate depth measurement. |
| RF Amplifier Power | System Power Pre-Regulation |
Use Scenario: PA bias supply in 5G/4G cellular front-end where input voltage varies from 3.2V (charged) to 2.8V (discharged). IC Role / Device Role / Timing Role: Buck-boost regulator providing constant 4.2V output to RF amplifier with minimal ripple and fast line transient recovery. Use Value: Delivers 96% peak efficiency at 3.6VIN/3.3VOUT and suppresses switching noise that could degrade EVM or ACLR. | Use Scenario: Intermediate rail generation for multi-rail SoC platforms (e.g., 3.3V from 4.2V battery) with tight load regulation requirements. IC Role / Device Role / Timing Role: Pre-regulator feeding downstream LDOs or buck converters; provides stable, well-regulated input to improve overall system PSRR. Use Value: Achieves ±0.3%/A load regulation and ±0.3%/V line regulation, reducing downstream voltage margining overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX77839AEFQ+T | Same FC2QFN-11 package and pinout, but FPWM-enable GPIO (Option A) instead of POK output; 4.4A ILIM vs. 3.6A. | Suitable where forced-PWM operation is needed for low-noise or fast transient response, not POK signaling. | Select MAX77839AEFQ+T only if system requires FPWM control and can accommodate higher peak current design margins. |
| TPS63810RGRT | 2.5V–5.5V input, 1.8V–5.5V output, 4A max, 1.8MHz switching, no POK output, different pinout and control interface. | Lacks dedicated POK output; requires external monitoring circuitry for power-good indication. | Choose TPS63810RGRT when board space allows larger solution size and POK is not mandatory; verify layout compatibility. |
Compared with MAX77839BEFQ+T, MAX77839AEFQ+T offers higher current capability and FPWM control but removes POK functionality, while TPS63810RGRT provides higher output current and wider VOUT range but lacks integrated POK and requires redesign of feedback and enable logic.
Availability
MAX77839BEFQ+T is available at Aetrix Electronics and suitable for asset tracking, smartphone sensor power, RF amplifier bias, and system pre-regulation applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX77839BEFQ+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 product line delivers ultra-low-IQ buck-boost regulators for space-constrained, battery-powered portable electronics where seamless voltage conversion and intelligent power sequencing are critical.
FAQ
What is the GPIO function of the MAX77839BEFQ+T?
The MAX77839BEFQ+T features a POK (power-ok) open-drain output on the GPIO pin, not FPWM input. When enabled, it pulls low when the regulated output voltage is within ±10% of the target value set by RSEL. This signal is used for system power sequencing and requires an external pull-up resistor (e.g., 15kΩ to VIO). The MAX77839BEFQ+T does not support FPWM mode.
What switching current limit applies to the MAX77839BEFQ+T?
The MAX77839BEFQ+T is designated as Option B in the MAX77839 family, specifying a 3.6A typical high-side switching current limit (ILIM). This value is confirmed in the Electrical Characteristics table and determines inductor saturation rating, PCB trace width, and thermal design margins. It differs from Options A and C (4.4A) and is fixed per device variant.
Which package does the MAX77839BEFQ+T use?
The MAX77839BEFQ+T uses the FC2QFN-11 package: 2.5mm × 2.0mm body, 0.5mm pitch, 11 leads with exposed thermal pad. This is distinct from the WLP variant (e.g., MAX77839BEWL+T). The FC2QFN offers superior thermal performance (θJA = 52.3°C/W) and is compatible with standard reflow processes.
How is output voltage set on the MAX77839BEFQ+T?
Output voltage on the MAX77839BEFQ+T is set by connecting a precision resistor (RSEL) between the SEL pin and AGND. The IC reads this resistance during startup to configure the internal DAC reference. Table 1 in the datasheet lists exact values - e.g., 0Ω (short) yields 3.3V, 40.2kΩ yields 3.6V. Resistor tolerance must be ≤1% for guaranteed accuracy.
Does the MAX77839BEFQ+T support active output discharge?
Yes, the MAX77839BEFQ+T includes integrated active output discharge via a 100Ω internal switch between OUT and PGND. This switch activates automatically when the device is disabled (EN low) or latched off due to fault (e.g., thermal shutdown, UVLO), ensuring rapid discharge of output capacitance to safe levels without external components.
MAX77839BEFQ+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)
MAX77839BEFQ+T FAQ
1.How can I place an order for MAX77839BEFQ+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77839BEFQ+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 MAX77839BEFQ+T reliable?
The price and inventory of MAX77839BEFQ+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77839BEFQ+T is usually 5 days.
3.What payment methods are accepted for MAX77839BEFQ+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77839BEFQ+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77839BEFQ+T?
MAX77839BEFQ+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77839BEFQ+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 MAX77839BEFQ+T?
For technical support, including MAX77839BEFQ+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77839BEFQ+T requirements.
6.How does Aetrix verify that MAX77839BEFQ+T is sourced from the original manufacturer or authorized distributors?
All MAX77839BEFQ+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 MAX77839BEFQ+T meets industry standards.
7.What is the process for return or replacement of MAX77839BEFQ+T?
All MAX77839BEFQ+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX77839BEFQ+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 MAX77839BEFQ+T part is unused and in its original packaging.
Return procedure for MAX77839BEFQ+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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