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Analog Devices Inc./Maxim Integrated MAX77504AAFC+T
- Part No.:
- MAX77504AAFC+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-PowerUFQFN
- Datasheet:
-
MAX77504AAFC+T.pdf
- Description:
- IC REG BUCK ADJ 3A 12FC2QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX77504AAFC+T 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 runtime in handheld computers and mirrorless cameras.
For engineers reviewing the MAX77504AAFC+T datasheet, MAX77504AAFC+T pinout, MAX77504AAFC+T application, or MAX77504AAFC+T equivalent, key selection criteria include its FC2QFN package compatibility, FPWM/SYNC pin for external clock synchronization, POK output for power-rail monitoring, and SEL-resistor programmable switching frequency (0.5–1.5MHz) with active discharge control.
Technical Context
The MAX77504AAFC+T implements peak current-mode PWM control with internal compensation, enabling stable regulation across wide input/output ranges and load transients. Its dual-mode operation - SKIP for light-load efficiency and forced-PWM (FPWM) for low-noise or synchronized applications - is selected via the FPWM/SYNC pin or external clock injection.
It integrates high-side (50mΩ typ) and low-side (27mΩ typ) DMOS FETs, cycle-by-cycle inductor current limiting (4A peak), thermal shutdown (+165°C), and soft-start (1.5ms typical). The VL regulator powers internal circuitry from either SUP or OUT (when VOUT > 1.7V), eliminating need for external bias rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.6V to 14V - supports full discharge range of 2S/3S Li-ion packs (6.0V–12.6V nominal) without external pre-regulation. |
| Output Current | 3A continuous - sufficient for core logic rails in professional radios and DSLR camera sensor subsystems. |
| Output Voltage Range | 0.6V to 6V - set by external resistor divider; covers I/O, core, and analog supply requirements in space-constrained devices. |
| Quiescent Current | 10μA at 12VIN/1.8VOUT - enables multi-week standby in always-on portable scanners and POS terminals. |
| Switching Frequency | 0.5MHz to 1.5MHz (SEL-programmable) - allows optimization between small external inductor size and EMI compliance. |
| Peak Efficiency | 94% at 7.4VIN/3.3VOUT - minimizes thermal dissipation in sealed enclosures like mirrorless camera bodies. |
| Protection Features | Cycle-by-cycle current limit, hiccup-mode short-circuit protection, UVLO (2.5V threshold), thermal shutdown (+165°C), and soft-start - ensures robust operation under fault conditions without external supervision. |
Pinout & Package
The MAX77504AAFC+T is packaged in a 2.5mm × 2.5mm, 12-lead flip-chip QFN (FC2QFN) with 0.5mm pitch and 0.6mm max height - suitable for high-density PCB layouts in handheld computing and imaging equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SUP | Buck supply input | Accepts 2.6V–14V battery input; requires local 10μF ceramic bypass to PGND for stability. |
| LX | Switching node | Connects to external inductor; high-impedance when disabled; drives internal high- and low-side FETs. |
| BST | Bootstrap supply | Requires 0.22μF capacitor to LX to bias high-side gate driver; enables efficient 100% duty cycle capability. |
| EN | Enable input | Logic-compatible with SUP domain; rising edge above 1.1V enables converter; no external pullup required. |
| FPWM/SYNC | Mode control & sync input | Drives high for forced-PWM; grounded for SKIP; accepts external clock (0.39–1.84MHz) for deterministic timing. |
| POK | Power-OK open-drain output | Asserts high when VOUT is within ±8% of target; requires external 10kΩ–100kΩ pullup for system sequencing. |
| FB | Feedback sense input | Monitors resistive divider on VOUT; 0.6V reference enables precise output setting with <±1% accuracy over temp. |
| SEL | Configuration selection | Connects to AGND via ±1% resistor to select switching frequency, gain, and active discharge enable/disable. |
| VL | Internal low-voltage supply | Auto-switches between SUP and OUT (if >1.7V); powers internal logic; bypass with 2.2μF ceramic to AGND. |
| OUT | Output voltage sense | Direct connection point to output capacitor; used for accurate remote sensing and active discharge path control. |
| AGND / PGND | Analog & power ground | Separate ground pins minimize noise coupling; must be connected together on PCB with low-inductance path. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ SKIP mode | 10μA typical supply current at 1.8VOUT extends battery life in always-on portable devices without sacrificing transient response. |
| Programmable switching frequency | Four discrete frequencies (0.5/0.75/1.0/1.5MHz) selected by single external RSEL, enabling EMI tuning and inductor size optimization. |
| Integrated active discharge | 100Ω internal resistor between OUT and PGND (enabled via SEL) ensures rapid output discharge during shutdown - critical for safe rail sequencing. |
| Robust protection suite | Cycle-by-cycle current limit, hiccup-mode short-circuit recovery, thermal shutdown with 15°C hysteresis, and UVLO prevent damage during abnormal operation. |
| VL auto-switching regulator | Eliminates need for external bias supply by sourcing internal logic power from SUP or VOUT (if >1.7V), reducing BOM count and layout complexity. |
Applications
| Handheld Professional Radio | Mirrorless Camera Power Rail |
|---|---|
Use Scenario: Compact UHF/VHF transceiver requiring clean, low-noise 3.3V and 1.8V rails from a 7.4V 2S Li-ion pack. IC Role / Device Role / Timing Role: Primary buck regulator delivering 3A continuous current to RF front-end and baseband processor. Use Value: Forced-PWM mode eliminates audible switching noise; POK output enables safe RF power-up sequencing; 94% efficiency minimizes heat in sealed chassis. |
Use Scenario: High-resolution image sensor and FPGA subsystem demanding fast transient response and tight output regulation. IC Role / Device Role / Timing Role: Core power supply for sensor interface and ISP processing unit with dynamic load steps up to 2.5A. Use Value: Peak current-mode control ensures sub-10μs transient recovery; soft-start prevents inrush-induced brownout; FC2QFN package fits tight camera module footprint. |
| Portable POS Terminal | Industrial Handheld Computer |
Use Scenario: Battery-operated retail terminal with barcode scanner, display backlight, and secure element - all powered from single 10.8V 3S Li-ion cell. IC Role / Device Role / Timing Role: Main DC-DC converter generating 5V for USB peripherals and 1.2V for application processor core. Use Value: 0.6V–6V adjustability supports multiple rail requirements; 10μA SKIP mode enables multi-day sleep mode; active discharge prevents backfeed during hot-swap battery replacement. |
Use Scenario: Ruggedized field computer operating in extreme temperatures (-40°C to +85°C ambient) with frequent deep-discharge cycles. IC Role / Device Role / Timing Role: Primary power management IC regulating 3.3V I/O and 1.8V memory rails from variable 2S/3S battery input. Use Value: Wide -40°C to +125°C junction rating ensures reliability; UVLO (2.5V) prevents operation below safe battery voltage; thermal shutdown protects against enclosure overheating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS6286418ARQYR | 3A, 2.7V–6V input, fixed 1.8V output; 1.8MHz switching; smaller 1.2mm × 0.8mm DSBGA package. | Fixed-output only; lacks POK, FPWM/SYNC, and SEL programmability; limited to lower-input applications. | Select when board space is critical and output voltage is fixed; not suitable for multi-rail or battery-voltage-scalable designs. |
| RTQ2132BWGQW | 3A, 2.7V–16V input, adjustable 0.6V–5.5V; 500kHz–2.2MHz programmable frequency; includes I2C interface. | Requires I2C host for configuration; larger 3mm × 3mm QFN; higher IQ (25μA) than MAX77504AAFC+T in SKIP mode. | Choose when digital control and telemetry (e.g., voltage margining, fault logging) are required; adds firmware overhead. |
Compared with TPS6286418ARQYR and RTQ2132BWGQW, the MAX77504AAFC+T uniquely balances ultra-low IQ, hardware-programmable flexibility (FPWM/SYNC, SEL, POK), and compact FC2QFN packaging - making it optimal for cost-sensitive, battery-life-critical portable systems without microcontroller-based PMIC management.
Availability
MAX77504AAFC+T is available at Aetrix Electronics and suitable for professional radio, mirrorless camera, and industrial handheld computer applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX77504AAFC+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
Maxim Integrated, now part of Analog Devices, designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and portable applications.
The MAX77504 belongs to Maxim's high-efficiency portable power management portfolio, engineered specifically for space- and battery-life-constrained 2S/3S Li-ion devices - emphasizing low IQ, small footprint, and robust protection without software dependency.
FAQ
What is the maximum input voltage supported by the MAX77504AAFC+T?
The MAX77504AAFC+T supports an absolute maximum input voltage of +16V on the SUP pin, but its specified operational input range is 2.6V to 14V. This 14V upper limit aligns with fully charged 3-cell Li-ion batteries (4.2V × 3 = 12.6V) plus margin for transient spikes, ensuring reliable operation in portable battery-powered systems without external clamping.
Does the MAX77504AAFC+T require an external clock to operate?
No, the MAX77504AAFC+T operates autonomously using its internal oscillator. The FPWM/SYNC pin defaults to SKIP mode when grounded and enables forced-PWM or external synchronization only when actively driven - making the MAX77504AAFC+T functional with zero external timing components in basic configurations.
How does the VL pin function in the MAX77504AAFC+T?
The VL pin on the MAX77504AAFC+T is an internally regulated 1.8V supply that powers core logic. It automatically switches its source between SUP and OUT depending on output voltage level - drawing from SUP when VOUT < 1.7V and from OUT when VOUT > 1.7V. This eliminates the need for an external bias rail while maintaining stable internal operation across the full output range.
Can the MAX77504AAFC+T be used in a design requiring active output discharge?
Yes, the MAX77504AAFC+T includes integrated active discharge controlled via the SEL pin. When configured with the appropriate RSEL value, it connects a 100Ω internal resistor between OUT and PGND upon disable, discharging the output capacitor rapidly - essential for safe power sequencing in multi-rail systems and preventing backfeed during hot-swap battery events.
What package type is used for the MAX77504AAFC+T?
The MAX77504AAFC+T uses the 2.5mm × 2.5mm, 12-lead flip-chip QFN (FC2QFN) package with 0.5mm pitch and 0.6mm maximum height. This package provides excellent thermal performance (θJA = 70.23°C/W on four-layer board) and enables high-density routing in portable electronics where board area is constrained.
MAX77504AAFC+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 12-PowerUFQFN
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX77504AAFC+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77504AAFC+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 MAX77504AAFC+T reliable?
The price and inventory of MAX77504AAFC+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77504AAFC+T is usually 5 days.
3.What payment methods are accepted for MAX77504AAFC+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77504AAFC+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77504AAFC+T?
MAX77504AAFC+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77504AAFC+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 MAX77504AAFC+T?
For technical support, including MAX77504AAFC+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77504AAFC+T requirements.
6.How does Aetrix verify that MAX77504AAFC+T is sourced from the original manufacturer or authorized distributors?
All MAX77504AAFC+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 MAX77504AAFC+T meets industry standards.
7.What is the process for return or replacement of MAX77504AAFC+T?
All MAX77504AAFC+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX77504AAFC+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 MAX77504AAFC+T part is unused and in its original packaging.
Return procedure for MAX77504AAFC+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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