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Analog Devices Inc./Maxim Integrated MAX77504AAFC+
- Part No.:
- MAX77504AAFC+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-PowerUFQFN
- Datasheet:
-
MAX77504AAFC+.pdf
- Description:
- IC REG BUCK ADJ 3A 12FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:605
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Product details
Overview
The MAX77504AAFC+ from Maxim Integrated is a synchronous 3A step-down DC-DC converter optimized for 2- or 3-cell Li+/Li-ion battery-powered portable electronics. It operates from 2.6V to 14V input, delivers adjustable 0.6V–6V output, achieves 94% peak efficiency at 7.4VIN/3.3VOUT, and features ultra-low 10μA quiescent current in SKIP mode - enabling extended battery life in handheld computers and mirrorless cameras.
For engineers reviewing the MAX77504AAFC+ datasheet, MAX77504AAFC+ pinout, MAX77504AAFC+ application, or MAX77504AAFC+ equivalent, key selection considerations include its dual-package availability (WLP/FC2QFN), FPWM/SYNC pin for external clock synchronization, dedicated POK output for rail monitoring, and SEL-resistor programmable switching frequency (0.5–1.5MHz) with active discharge control.
Technical Context
The MAX77504AAFC+ implements a peak current-mode PWM control architecture with internal compensation, delivering cycle-by-cycle inductor current limiting and soft-start. Its high-gain control loop ensures stable regulation across wide input/output ranges and load transients.
It integrates two independent power domains: SUP powers the buck stage and logic, while VL (1.8V regulated output) supplies internal circuitry and automatically switches between SUP and OUT based on VOUT > 1.7V - reducing system IQ. The FPWM/SYNC pin supports three modes: SKIP (low-IQ), forced-PWM (fixed-frequency), and external clock synchronization within validated ±15% frequency windows per FSW[1:0] setting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.6V to 14V - supports full discharge range of 2S/3S Li-ion batteries (6.0V–12.6V nominal) plus headroom for surge and adapter inputs. |
| Output Current | 3A continuous - sufficient for core rails in professional radios, DSLRs, and POS terminals without external current boosting. |
| Output Voltage Range | 0.6V to 6V - set via external resistor divider; covers I/O, memory, and processor core voltages in space-constrained designs. |
| Switching Frequency | 0.5MHz to 1.5MHz (SEL-programmable) - enables compact magnetics; higher frequencies reduce inductor size but increase switching loss. |
| Quiescent Current | 10μA at 12VIN/1.8VOUT in SKIP mode - minimizes no-load battery drain in always-on subsystems like real-time clocks or sensors. |
| Protection Features | Cycle-by-cycle current limit (4A peak), hiccup-mode short-circuit response, thermal shutdown (+165°C), UVLO (2.5V threshold), and active discharge - ensures robust operation under fault conditions. |
| Package Options | 2.5mm × 2.5mm FC2QFN (12-lead, 0.5mm pitch) or 1.7mm × 1.7mm WLP (16-bump, 0.4mm pitch) - both suitable for HDI and non-HDI PCBs with minimal footprint. |
Pinout & Package
MAX77504AAFC+ is packaged in a 2.5mm × 2.5mm, 12-lead flip-chip QFN (FC2QFN) with 0.5mm pitch and 0.6mm max height. This RoHS-compliant package supports standard reflow and offers low thermal resistance (θJA = 70.23°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BST) | Bootstrap Supply | Drives high-side MOSFET gate; requires 0.22μF ceramic capacitor to LX for proper gate drive voltage generation. |
| 2 (EN) | Enable Input | Active-high logic control (VEN_HI = 1.1V); compatible with SUP domain; enables/disables entire buck regulator. |
| 3 (FPWM/SYNC) | Mode Control & Sync Input | Selects SKIP/FPWM mode or accepts external clock (±15% window around selected fSW) for deterministic timing in noise-sensitive systems. |
| 4 (POK) | Power-OK Output | Open-drain status signal indicating VOUT is within ±8% of target; requires external pullup (10kΩ–100kΩ) for host microcontroller monitoring. |
| 5 (SEL) | Configuration Selection | Resistor-to-AGND sets switching frequency, gain, and active discharge enable - eliminates need for configuration registers or I²C interface. |
| 6 (OUT) | Output Sense Input | Direct connection to output capacitor node; used internally for VL supply switchover and active discharge path control. |
| 7 (AGND) | Analog Ground | Quiet reference for FB, VL, and internal analog circuits; must be connected to PGND on PCB with low-inductance path. |
| 8 (FB) | Feedback Input | Senses divided output voltage; 0.6V reference accuracy (±1%) enables precise regulation; sensitive to EMI - route away from noisy nodes. |
| 9 (VL) | Internal LDO Output | 1.8V regulated supply for internal logic; auto-switches from SUP to OUT when VOUT > 1.7V - reduces system IQ during light loads. |
| 10 (PGND) | Power Ground | High-current return path for LX and SUP; must be solidly connected to AGND near IC to minimize ground bounce and EMI. |
| 11 (LX) | Switch Node | Connects to external inductor and low-side MOSFET; high dv/dt node - keep trace short and avoid routing near sensitive signals. |
| 12 (SUP) | Main Input Supply | Buck input rail; requires 10μF ceramic bypass capacitor placed adjacent to pin to suppress high-frequency ripple and ensure stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-Low Quiescent Current | 10μA at 12VIN/1.8VOUT in SKIP mode - extends battery runtime in always-on portable devices without compromising startup time. |
| Programmable Switching Frequency | Four fixed options (0.5/0.75/1.0/1.5MHz) selected by single RSEL resistor - balances efficiency, size, and EMI without firmware or serial interface. |
| Dual-Package Flexibility | FC2QFN (2.5×2.5mm) and WLP (1.7×1.7mm) variants - allows layout optimization for thermal performance (FC2QFN) or extreme space constraints (WLP). |
| Integrated Active Discharge | 100Ω internal discharge path enabled via SEL - rapidly collapses VOUT when disabled, preventing back-powering of downstream circuitry. |
| Robust Fault Protection | Cycle-by-cycle current limit, thermal shutdown (+165°C), UVLO, and hiccup-mode short-circuit response - eliminates need for external protection components in most applications. |
| VL Auto-Swappable Supply | VL automatically draws from OUT when VOUT > 1.7V - reduces total system IQ by eliminating standby current through SUP-to-VL LDO path. |
Applications
| Professional Radio Power Management | Mirrorless Camera Core Rail |
|---|---|
|
Use Scenario: Portable UHF/VHF transceivers requiring stable 3.3V or 5V core supply from 7.4V 2S Li-ion battery with minimal heat buildup during transmit bursts. IC Role / Device Role / Timing Role: Primary buck regulator delivering 3A continuous current; handles rapid load steps up to 2A/μs during RF PA activation. Use Value: 94% peak efficiency and 10μA SKIP-mode IQ extend talk time; POK signal synchronizes MCU wake-up with rail readiness. |
Use Scenario: High-resolution image sensor and FPGA core supply in compact mirrorless cameras powered by 10.8V 3S Li-ion packs. IC Role / Device Role / Timing Role: Adjustable 1.2V/1.8V/2.5V output regulator with fast transient response; SEL-configured 1.5MHz switching enables <1mm³ inductor size. Use Value: Active discharge ensures clean power-down of sensor interface; VL auto-switchover cuts system IQ by >30% during standby imaging modes. |
| Handheld Computer SoC Rail | POS Terminal Display Backlight Driver |
|
Use Scenario: Powering ARM-based application processors in ruggedized handheld computers operating across -20°C to +60°C ambient. IC Role / Device Role / Timing Role: Main SoC core voltage regulator (0.8V–1.2V); uses FPWM mode to eliminate audible noise during UI interaction. Use Value: Thermal shutdown and UVLO protect against battery sag during heavy compute loads; FC2QFN package provides reliable thermal dissipation on 2-layer boards. |
Use Scenario: Driving white LED backlight arrays in retail POS terminals using 3.7V–12.6V battery or adapter input. IC Role / Device Role / Timing Role: Constant-voltage source feeding LED driver IC; configured for 5V/6V output with 1.5MHz switching to minimize EMI near touchscreens. Use Value: POK output validates backlight rail before display initialization; active discharge prevents ghost illumination after power-off commands. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62864A0RQYR | 2.7V–6V input, 3A, 0.6V–5.5V output, 1.8MHz fixed frequency, 1.2μA IQ - lacks external sync, SEL programming, or active discharge. | Better suited for fixed-input adapter-powered systems; not recommended for wide-input battery apps due to lower VIN max. | Choose TPS62864A0RQYR only if system input is tightly regulated ≤6V and external clock sync is unnecessary. |
| RTQ2132BGQW | 2.5V–5.5V input, 3A, 0.6V–3.3V output, 0.5–2.2MHz programmable via resistor, 15μA IQ - narrower VIN range, no POK or VL switchover. | Optimized for single-cell or USB-PD applications; cannot support 3S Li-ion without pre-regulation. | Select RTQ2132BGQW when input is limited to ≤5.5V and board space permits larger inductors for sub-1MHz operation. |
Compared with TPS62864A0RQYR and RTQ2132BGQW, the MAX77504AAFC+ uniquely supports 14V input, integrated POK monitoring, VL auto-switchover for ultra-low IQ, and SEL-based configuration - making it the only option qualified for direct 2S/3S Li-ion battery regulation in space-constrained portable systems.
Availability
MAX77504AAFC+ is available at Aetrix Electronics and suitable for professional radio power management, mirrorless camera core rails, handheld computer SoC supplies, POS terminal displays, and space-constrained portable electronics requiring stable component supply across industrial temperature ranges.
Supply support for MAX77504AAFC+ 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
Maxim Integrated, now part of Analog Devices, designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and portable applications.
The MAX77504AAFC+ belongs to Maxim's high-efficiency portable power management portfolio, engineered specifically for battery-operated devices needing compact, low-IQ, and robust DC-DC conversion without digital control overhead.
FAQ
What is the maximum input voltage rating for the MAX77504AAFC+?
The MAX77504AAFC+ has an absolute maximum input voltage rating of +16V on the SUP pin, with recommended operational range from 2.6V to 14V. This 14V upper limit accommodates full charge voltage of 3-cell Li-ion batteries (12.6V) plus margin for transient spikes and adapter input variations - ensuring safe and reliable operation in portable 2S/3S battery systems.
Does the MAX77504AAFC+ support external clock synchronization?
Yes, the MAX77504AAFC+ supports external clock synchronization via the FPWM/SYNC pin, but only for versions with synchronization capability enabled. Valid sync frequency windows are ±15% around the selected switching frequency (e.g., 0.425–0.575MHz for 0.5MHz mode). Synchronization is confirmed for MAX77504AAFC+ per Maxim's Ordering Information table and enables deterministic timing in noise-sensitive or multi-rail synchronized systems.
How does the VL pin function in the MAX77504AAFC+?
The VL pin on the MAX77504AAFC+ is a 1.8V regulated internal supply output that automatically switches its source between SUP and OUT depending on VOUT. When VOUT rises above 1.7V, VL draws from OUT instead of SUP - reducing total quiescent current by eliminating the SUP-to-VL LDO dropout loss. This feature directly enables the MAX77504AAFC+'s 10μA IQ specification and extends battery life in always-on portable applications.
What package type is used by the MAX77504AAFC+?
The MAX77504AAFC+ uses the 2.5mm × 2.5mm, 12-lead flip-chip QFN (FC2QFN) package with 0.5mm pitch and 0.6mm maximum height. This package is distinct from the WLP variant and features exposed thermal pad for enhanced heat dissipation. Its land pattern follows Maxim outline number 21-100406 and is compatible with standard reflow processes and IPC-7351B footprints.
Can the MAX77504AAFC+ provide active discharge of the output capacitor?
Yes, the MAX77504AAFC+ provides integrated active discharge via an internal 100Ω resistor between OUT and PGND, enabled by the SEL configuration resistor. When the buck is disabled, this path rapidly discharges the output capacitor to prevent back-powering of downstream circuitry or unintended wake-up events - a critical feature for reliable power sequencing in portable electronics where clean shutdown is required.
MAX77504AAFC+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 12-PowerUFQFN
- Packaging:
- Strip
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.6V
- Voltage - Input (Max):
- 14V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 3A
- Frequency - Switching:
- 500kHz ~ 1.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-FC2QFN (2.5x2.5)
MAX77504AAFC+ FAQ
1.How can I place an order for MAX77504AAFC+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77504AAFC+ 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 MAX77504AAFC+ reliable?
The price and inventory of MAX77504AAFC+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77504AAFC+ is usually 5 days.
3.What payment methods are accepted for MAX77504AAFC+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77504AAFC+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77504AAFC+?
MAX77504AAFC+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77504AAFC+ 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 MAX77504AAFC+?
For technical support, including MAX77504AAFC+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77504AAFC+ requirements.
6.How does Aetrix verify that MAX77504AAFC+ is sourced from the original manufacturer or authorized distributors?
All MAX77504AAFC+ 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 MAX77504AAFC+ meets industry standards.
7.What is the process for return or replacement of MAX77504AAFC+?
All MAX77504AAFC+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX77504AAFC+, 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 MAX77504AAFC+ part is unused and in its original packaging.
Return procedure for MAX77504AAFC+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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