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Analog Devices Inc./Maxim Integrated MAX77839AEFQ+
- Part No.:
- MAX77839AEFQ+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 11-UFQFN
- Datasheet:
-
MAX77839AEFQ+.pdf
- Description:
- LOW IQ BUCK-BOOST CONVERTER
- Quantity:
- Payment:
- Shipping:
Inventory:2,931
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Product details
Overview
The MAX77839AEFQ+ from Analog Devices is a high-efficiency, 4.4A switching-current buck-boost regulator optimized for single-cell Li-ion and low-voltage battery chemistries (≥1.8V discharge). It delivers 2.3V–5.3V output via single-resistor programming, operates from 1.8V–5.5V input, achieves 96% peak efficiency at 3.6VIN/3.3VOUT, and features 6μA quiescent current-enabling multi-year battery life in asset tracking and cellular IoT devices.
For engineers reviewing the MAX77839AEFQ+ datasheet, MAX77839AEFQ+ pinout, MAX77839AEFQ+ application, or MAX77839AEFQ+ equivalent, key selection criteria include its 4.4A current limit (A/B option), FPWM-mode GPIO configuration, FC2QFN-11 package footprint, seamless buck-boost transition, and active output discharge for controlled power-down sequencing.
Technical Context
The MAX77839AEFQ+ implements a four-switch H-bridge architecture with current-mode PWM control at 2.2MHz (typ), enabling fast transient response and compact external components. Its proprietary phase control (Φ1–Φ4) dynamically selects buck, boost, or buck-boost operation based on real-time VIN/VOUT relationship, ensuring stable regulation across full input range without mode-hopping artifacts.
It integrates dual protection schemes: cycle-by-cycle inductor peak current limiting (4.4A typ) with 2ms latch-off timeout, and independent overvoltage protection (0.5V differential threshold between OUT/OUTS) that safeguards against open-sense faults. The SEL pin uses resistor-based voltage targeting with ±1.0% accuracy in FPWM mode, while active discharge employs a dedicated 100Ω internal switch to PGND.
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 by single external resistor (RSEL) with ±1.0% accuracy in FPWM mode. |
| Switching Current Limit | 4.4A (typ) - enables 3A continuous output with thermal derating; defines inductor saturation margin and PCB trace sizing. |
| Quiescent Current | 6μA - extends battery runtime in always-on, low-duty-cycle applications like GPS trackers. |
| Switching Frequency | 2.2MHz (typ) - allows use of small 1μH inductors and reduces EMI filtering requirements. |
| Peak Efficiency | 96% at VIN=3.6V, VOUT=3.3V - minimizes thermal load in space-constrained mobile modules. |
| GPIO Function | FPWM input - forces fixed-frequency PWM operation to eliminate audible noise and ensure consistent transient response. |
Pinout & Package
MAX77839AEFQ+ uses the 2.5mm × 2.0mm, 0.5mm pitch, 11-lead FC2QFN package (package code F112A2F+1), optimized for thermal performance (θJA = 52.3°C/W on 4-layer board) and high-density layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Buck-boost input supply | Accepts 1.8V–5.5V; requires dual 10μF X7R ceramic bypass capacitors directly at pin for high-frequency noise suppression. |
| OUT | Regulated power output | Delivers 2.3V–5.3V; connects to load via low-impedance path; bypassed with 47μF X7R capacitor at point-of-load. |
| OUTS | Output voltage sense input | Feedback node for closed-loop regulation; must be routed away from noisy LX nodes to avoid instability. |
| LX1, LX2 | Switching nodes | High-dV/dt nodes connecting to inductor; require short, wide traces and minimal loop area to reduce EMI and switching losses. |
| PGND | Power ground | Primary return path for high-current switching loops; must be solid copper plane under IC and connected to CIN/COUT grounds. |
| AGND | Analog ground | Reference for bias circuitry and error amplifier; tied to PGND at single point on low-impedance ground plane. |
| EN | Enable input | Active-high digital control; 100μs turn-on delay ensures stable bias before soft-start initiation. |
| GPIO | FPWM mode control | Configured as digital input for forced-PWM operation; logic-high enables constant-frequency switching regardless of load. |
| SEL | Output voltage selection | Analog input setting target VOUT via resistor divider; reading time (450μs) determines startup latency. |
| BIAS | Internal bias supply | Must be bypassed with 2.2μF X7R capacitor; not externally loaded-ensures stable reference for analog blocks. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch H-bridge topology | Enables seamless buck-boost transition without discontinuity in regulation or output ripple during VIN crossing VOUT. |
| Active output discharge | 100Ω internal switch discharges output capacitor rapidly upon disable, preventing residual voltage from interfering with downstream sequencing. |
| Configurable FPWM GPIO | Eliminates skip-mode frequency variation-critical for RF-sensitive applications where spectral content must remain fixed. |
| Ultra-low 6μA quiescent current | Reduces standby power loss to <1μW at 1.8V input, enabling >10-year battery life in low-duty-cycle sensor nodes. |
| Dual ILIM options (4.4A/3.6A) | Allows matching inductor and MOSFET sizing to exact load requirements-minimizing solution size and cost without overdesign. |
Applications
| Asset Tracking | 5G Cellular Power |
|---|---|
Use Scenario: GPS/GSM module operating intermittently in remote logistics tags powered by coin-cell or Li-SOCl₂ batteries. IC Role / Device Role / Timing Role: Primary system pre-regulator delivering stable 3.3V or 3.6V to modem and MCU during burst transmissions. Use Value: 6μA IQ and skip-mode operation extend battery life beyond 5 years; 4.4A ILIM supports 2A GSM transmit peaks without dropout. |
Use Scenario: Compact 5G NR sub-6GHz module requiring clean, efficient 3.8V rail for PA bias and baseband ICs. IC Role / Device Role / Timing Role: Intermediate buck-boost stage converting variable battery voltage (2.8V–4.4V) to regulated 3.8V with low noise. Use Value: 2.2MHz switching avoids interference with 5G bands; FPWM mode ensures consistent EMI profile during RF transmission. |
| Smartphone ToF Sensors | RF Amplifier Bias |
Use Scenario: Time-of-flight depth sensing module in smartphone front camera, requiring precise 4.2V bias for VCSEL driver. IC Role / Device Role / Timing Role: High-accuracy output regulator with ±1.0% FPWM-mode tolerance feeding laser diode driver IC. Use Value: Single-resistor RSEL programming simplifies BOM; active discharge prevents ghost illumination after shutdown. |
Use Scenario: GaAs pHEMT amplifier in mmWave test equipment needing stable 5.0V bias with fast load transient response. IC Role / Device Role / Timing Role: Point-of-load regulator supplying 5.0V at up to 3A with <10μs recovery from 80% load step. Use Value: Four-phase H-bridge architecture delivers superior line/load regulation vs. traditional buck converters at same frequency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63802DLAR | 3.2A ILIM, 2.5MHz switching, no FPWM option-uses PFM-only or forced-PWM with external clock sync. | Lacks dedicated FPWM input; requires external signal conditioning for deterministic timing control. | Select when lower current (≤2.5A) suffices and system-level clock synchronization is available. |
| ISL9122AIRAJZ-T7A | 4.5A ILIM, 3MHz switching, integrated I²C interface for dynamic VOUT adjustment and telemetry. | Requires I²C bus and firmware support; adds complexity but enables adaptive voltage scaling. | Select when programmable output voltage and real-time fault reporting are required over fixed-resistor simplicity. |
Compared with TPS63802DLAR and ISL9122AIRAJZ-T7A, the MAX77839AEFQ+ offers the lowest quiescent current (6μA vs. ≥12μA), native FPWM pin for direct hardware control, and smaller FC2QFN footprint-making it optimal for ultra-low-power, size-constrained, and timing-critical battery-powered systems.
Availability
MAX77839AEFQ+ is available at Aetrix Electronics and suitable for asset tracking, 5G cellular modems, and smartphone ToF sensor power applications requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX77839AEFQ+ 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 (acquired Maxim Integrated in 2021) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving precision instrumentation, industrial automation, and communications markets.
The MAX77839AEFQ+ belongs to Maxim's ultra-low-IQ power management portfolio, designed specifically for battery-powered edge devices demanding multi-year operation, seamless voltage conversion, and minimal PCB area.
FAQ
What is the switching current limit for MAX77839AEFQ+?
The MAX77839AEFQ+ has a typical high-side switching current limit of 4.4A, as defined by its "A" option designation in the ordering matrix. This value sets the peak inductor current during normal operation and determines minimum inductor saturation rating-Coilcraft XEL4020-102ME (9.0A sat) is a validated choice per the datasheet. The 4.4A limit applies during steady-state and soft-start phases, with reduced ILIM_SS (2.1A typ) active only during startup.
Does MAX77839AEFQ+ support forced-PWM (FPWM) mode?
Yes, MAX77839AEFQ+ supports forced-PWM mode via its GPIO pin, which is configured as an FPWM input per the "A" option. When GPIO is driven high, the converter operates continuously at 2.2MHz regardless of load, eliminating frequency modulation and associated acoustic noise-critical for RF and imaging applications. In FPWM mode, output voltage accuracy improves to ±1.0% (vs. ±3.5% in skip mode).
What package type does MAX77839AEFQ+ use?
MAX77839AEFQ+ uses the 11-lead FC2QFN package (2.5mm × 2.0mm, 0.5mm pitch), identified by package code F112A2F+1. This thermally enhanced QFN variant provides lower junction-to-ambient thermal resistance (52.3°C/W) than the WLP option and supports standard reflow assembly. Pin 1 is marked by a dot; the exposed thermal pad must be soldered to a solid ground plane for optimal thermal performance.
How is output voltage set on MAX77839AEFQ+?
Output voltage on MAX77839AEFQ+ is set by connecting a precision resistor (RSEL) between the SEL pin and AGND. The device reads this resistance during startup (tRSEL ≈ 450μs) to determine target VOUT. For example, a 0Ω (short) yields 3.3V; a 40.2kΩ resistor yields 3.6V. Resistor tolerance must be ≤1% to maintain ±1.0% output accuracy in FPWM mode, as specified in Table 1 of the datasheet.
What protections are integrated into MAX77839AEFQ+?
MAX77839AEFQ+ integrates undervoltage lockout (UVLO, 1.75V rising threshold), overvoltage protection (OVP, 0.5V differential between OUT/OUTS), cycle-by-cycle inductor peak current limiting (4.4A typ), thermal shutdown (150°C), and active output discharge (100Ω internal switch). These operate independently-e.g., OVP triggers even if EN is high, and active discharge engages immediately upon EN deassertion or UVLO activation.
MAX77839AEFQ+ 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)
MAX77839AEFQ+ FAQ
1.How can I place an order for MAX77839AEFQ+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77839AEFQ+ 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 MAX77839AEFQ+ reliable?
The price and inventory of MAX77839AEFQ+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77839AEFQ+ is usually 5 days.
3.What payment methods are accepted for MAX77839AEFQ+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77839AEFQ+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77839AEFQ+?
MAX77839AEFQ+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77839AEFQ+ 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 MAX77839AEFQ+?
For technical support, including MAX77839AEFQ+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77839AEFQ+ requirements.
6.How does Aetrix verify that MAX77839AEFQ+ is sourced from the original manufacturer or authorized distributors?
All MAX77839AEFQ+ 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 MAX77839AEFQ+ meets industry standards.
7.What is the process for return or replacement of MAX77839AEFQ+?
All MAX77839AEFQ+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX77839AEFQ+, 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 MAX77839AEFQ+ part is unused and in its original packaging.
Return procedure for MAX77839AEFQ+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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