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Analog Devices Inc./Maxim Integrated MAX77533BEWC12+T
- Part No.:
- MAX77533BEWC12+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 12-WFBGA, WLBGA
- Datasheet:
-
MAX77533BEWC12+T.pdf
- Description:
- IC REG BUCK
- Quantity:
- Payment:
- Shipping:
Inventory:3,001
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Product details
Overview
The MAX77533BEWC12+T from Analog Devices is a synchronous 1.5A step-down DC-DC converter optimized for 2-cell/3-cell Li+/Li-ion battery and USB-C portable applications. It operates from 3V to 14V input, delivers adjustable output from 0.8V to 5V (50mV steps via I²C) or 0.8V to 99% of VSUP (external feedback), and features factory-default outputs of 1.2V, 1.8V, or 3.3V. Its 9μA quiescent current in SKIP mode enables extended battery life in drones, HD cameras, and space-constrained notebooks.
For engineers reviewing the MAX77533BEWC12+T datasheet, MAX77533BEWC12+T pinout, MAX77533BEWC12+T application, or MAX77533BEWC12+T equivalent, key selection criteria include its 12-bump WLP package (1.85mm × 1.4mm), dual-mode control (hardware EN/POK + optional I²C), 94% peak efficiency at 7.4VSUP/3.3VOUT, cycle-by-cycle current limiting, and integrated active discharge.
Technical Context
The MAX77533BEWC12+T implements a fixed-frequency peak current-mode PWM controller with internal slope compensation and high-gain integrator-based feedback for zero steady-state error. It supports two switching frequencies-1MHz (standard) or 550kHz (for VOUT ≤ 1.5V)-and dynamically selects between SKIP mode (ultra-low IQ) and forced-PWM mode based on load conditions.
Hardware control is enabled via dedicated EN and POK pins with defined logic thresholds (VENHI = 1.1V, VENLO = 0.4V), while optional I²C interface (1MHz clock, 7-bit slave address) allows dynamic voltage scaling, register configuration, and status monitoring. Protection includes hiccup-mode short-circuit response, thermal shutdown at +165°C, UVLO (2.9V nominal), and active discharge (100Ω internal resistor).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 14V - supports 2S/3S Li-ion packs and USB-C PD sources without external pre-regulation. |
| Output Current | 1.5A continuous - sufficient for core rails in portable SoCs and imaging subsystems. |
| Quiescent Supply Current | 9μA typical (12VSUP, 1.8VOUT, internal feedback) - extends battery runtime in standby/sleep states. |
| Switching Frequency | 1MHz (or 550kHz for low-VOUT) - balances efficiency, inductor size, and EMI performance. |
| Output Voltage Accuracy | ±1% over temperature (e.g., 1.176V–1.224V for 1.2V default) - ensures stable core voltage under varying load/thermal conditions. |
| Package Dimensions | 1.85mm × 1.4mm × 0.7mm WLP - enables ultra-compact PCB layouts in thin-profile consumer devices. |
| Thermal Shutdown | +165°C with +15°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
Pinout & Package
The MAX77533BEWC12+T is housed in a 12-bump wafer-level package (WLP) with 0.4mm pitch, 3×4 bump array, and footprint 1.85mm × 1.4mm. Bump side down mounting requires precise stencil design and reflow profile control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | High-side gate driver supply | Requires 0.22μF ceramic capacitor to LX; critical for MOSFET turn-on strength and efficiency. |
| SUP | Main power input | 3V–14V supply rail; must be bypassed with 4.7μF ceramic capacitor near the pin to suppress ripple and transients. |
| LX | Switching node | Connects to inductor; high-impedance when disabled; routing must minimize parasitic inductance for EMI control. |
| PGND | Power ground | Low-impedance return path for high-current switching; must be solidly connected to AGND on PCB. |
| OUT/FB | Output sense / feedback input | Internal feedback: connects directly to output cap; external feedback: connects to resistor divider for programmable VOUT. |
| EN | Enable control input | Active-high logic input (1.1V threshold); controls buck operation independently of I²C; compatible with SUP domain. |
| POK | Power-OK open-drain output | Signals valid regulation (90–94% of target VOUT); requires external pull-up (10kΩ–100kΩ) for system sequencing. |
| BIASEN | I²C interface enable | Activates SDA/SCL logic without enabling buck output - enables firmware configuration before power delivery. |
| SDA/SCL | I²C data/clock | Standard 1MHz I²C interface; pins must be pulled low if unused to prevent floating inputs and noise coupling. |
| VL | Internal bias supply output | 1.8V regulated output for internal circuitry; bypassed with 2.2μF capacitor; not for external loading. |
| AGND | Analog ground | Quiet reference for feedback and I²C; must be tied to PGND at single point to avoid ground loops. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-programmed output voltages | 1.2V, 1.8V, or 3.3V defaults reduce BOM count and simplify layout for common processor/core rails. |
| Selectable light-load operating modes | SKIP mode (9μA IQ) maximizes efficiency below ~100mA; FPWM mode ensures fixed frequency for EMI-sensitive systems. |
| Dual-control architecture | Hardware EN/POK enables boot-time sequencing; optional I²C adds dynamic voltage scaling and telemetry for adaptive power management. |
| Integrated protection suite | Cycle-by-cycle current limit, hiccup-mode short-circuit response, thermal shutdown, and active discharge ensure robustness across fault conditions. |
| Ultra-compact WLP packaging | 1.85mm × 1.4mm footprint with 0.7mm max height enables placement in tight spaces behind displays or under batteries. |
Applications
| Drone Flight Controller Power | HD Camera Image Sensor Rail |
|---|---|
Use Scenario: Powers FPGA, IMU, and radio modules in compact quadcopters where weight and thermal envelope are critical. IC Role / Device Role / Timing Role: Primary 1.8V core supply delivering up to 1.5A with fast transient response to motor startup surges. Use Value: 94% peak efficiency and 9μA SKIP-mode IQ extend flight time; 12-bump WLP minimizes board area for lightweight airframes. | Use Scenario: Supplies 1.2V digital core and 3.3V analog interface for high-resolution CMOS image sensors in action cameras. IC Role / Device Role / Timing Role: Dual-rail generation using factory-default 1.2V and 3.3V variants; tight output accuracy maintains sensor ADC linearity. Use Value: ±1% VOUT tolerance ensures consistent pixel response; active discharge prevents residual voltage during sensor reset sequences. |
| Notebook System-on-Chip Core | USB-C Powered Portable Monitor |
Use Scenario: Delivers clean, low-noise 1.2V core voltage to ARM-based SoCs in fanless ultrabooks with strict thermal limits. IC Role / Device Role / Timing Role: High-efficiency buck regulator with soft-start (1ms default) to prevent inrush current during cold boot. Use Value: 1MHz switching enables small 2.2μH inductors; thermal shutdown (+165°C) protects against throttling-induced overheating. | Use Scenario: Steps down 9V/15V USB-C PD input to 5V or 3.3V for display logic and backlight drivers in slim-profile monitors. IC Role / Device Role / Timing Role: Adjustable-output buck supporting multiple USB-C PD profiles via I²C; POK signal synchronizes display initialization. Use Value: I²C programmability allows firmware-driven voltage selection; 3V–14V input range accommodates variable PD source voltages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS6286410RTER | 1.2A output, 2.7V–6V input, 0.6V–5.5V output, 2.5mm × 2.5mm QFN | Lower current rating and narrower input range; better suited for single-cell battery systems | Choose for cost-sensitive, lower-power applications where 1.5A headroom is unnecessary and QFN assembly is preferred. |
| RTQ2134BGQW | 2A output, 2.7V–18V input, 0.6V–5.5V output, 2mm × 2mm WLCSP | Higher current capability and wider input range; slightly larger footprint (2.0mm × 2.0mm) | Choose when >1.5A margin is required or input may exceed 14V (e.g., automotive USB-C adapters). |
Compared with TPS6286410RTER and RTQ2134BGQW, the MAX77533BEWC12+T offers optimal balance of ultra-low IQ (9μA), factory-default voltages, and minimal 1.85mm × 1.4mm WLP footprint - making it ideal for space- and battery-life-constrained 2S/3S portable designs.
Availability
The MAX77533BEWC12+T is available at Aetrix Electronics and suitable for drone flight controllers, HD camera sensor rails, and notebook SoC core supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX77533BEWC12+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 MAX77533BEWC12+T belongs to Analog Devices' MAX77xxx family of highly integrated power management ICs designed specifically for portable battery-powered systems demanding high efficiency, small size, and flexible control.
FAQ
What is the recommended input capacitor for the MAX77533BEWC12+T?
The MAX77533BEWC12+T requires a 4.7μF ceramic capacitor placed as close as possible to the SUP pin and PGND. This capacitor stabilizes the input rail during high di/dt switching events and reduces voltage ripple. Additional bulk capacitance (e.g., 10–22μF tantalum or polymer) may be added upstream depending on source impedance and transient load requirements. The device's UVLO threshold is 2.9V, so input capacitance must maintain SUP above this level during peak current draw.
Does the MAX77533BEWC12+T support external feedback for custom output voltages?
Yes, the MAX77533BEWC12+T supports external feedback via the OUT/FB pin. When configured for external feedback, the output voltage is set using a resistor divider between VOUT and AGND, targeting 0.8V at FB. The device also supports a 100pF feed-forward capacitor between VOUT and FB to improve transient response. External feedback enables outputs from 0.8V up to 99% of VSUP, unlike the 0.8V–5V I²C-programmable range of internal feedback versions.
How does the MAX77533BEWC12+T handle short-circuit conditions?
The MAX77533BEWC12+T responds to short-circuit faults with hiccup-mode protection. Upon detection (via valley current sensing or output voltage collapse), switching halts and the device enters a retry cycle. For internal feedback versions, the hiccup timer is 12ms (VOUT-REG ≥ 1.55V) or 21.8ms (≤1.5V); external feedback versions use 12ms. After timeout, the controller attempts restart. This limits average power dissipation and prevents thermal runaway while allowing automatic recovery once the fault clears.
Can the MAX77533BEWC12+T operate without I²C communication?
Yes, the MAX77533BEWC12+T functions fully without I²C. Hardware control via EN and BIASEN pins enables basic on/off operation and I²C interface activation. Factory-default output voltages (1.2V, 1.8V, or 3.3V) eliminate dependency on I²C for initial power-up. I²C is optional and used only for advanced features like dynamic voltage scaling, register readback, or fine-grained parameter tuning - making the MAX77533BEWC12+T suitable for both simple and complex firmware environments.
What is the thermal performance of the MAX77533BEWC12+T in a standard PCB layout?
In a four-layer JEDEC-standard board per JESD51-7, the MAX77533BEWC12+T has a junction-to-ambient thermal resistance (θJA) of 72.82°C/W. At 1.5A load and 12VSUP/1.8VOUT, typical power dissipation is ~225mW, resulting in ~16.4°C junction rise above ambient. Derating begins above +70°C ambient, with 13.73mW/°C reduction in allowable power. Proper copper pour under the WLP and thermal vias to inner ground planes significantly improve real-world thermal performance.
MAX77533BEWC12+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 12-WFBGA, WLBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Converter, USB
- Voltage - Input:
- 3V ~ 14V
- Number of Outputs:
- 1
- Voltage - Output:
- Programmable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-WLP (1.85x1.4)
MAX77533BEWC12+T FAQ
1.How can I place an order for MAX77533BEWC12+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77533BEWC12+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 MAX77533BEWC12+T reliable?
The price and inventory of MAX77533BEWC12+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77533BEWC12+T is usually 5 days.
3.What payment methods are accepted for MAX77533BEWC12+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77533BEWC12+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77533BEWC12+T?
MAX77533BEWC12+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77533BEWC12+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 MAX77533BEWC12+T?
For technical support, including MAX77533BEWC12+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77533BEWC12+T requirements.
6.How does Aetrix verify that MAX77533BEWC12+T is sourced from the original manufacturer or authorized distributors?
All MAX77533BEWC12+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 MAX77533BEWC12+T meets industry standards.
7.What is the process for return or replacement of MAX77533BEWC12+T?
All MAX77533BEWC12+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX77533BEWC12+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 MAX77533BEWC12+T part is unused and in its original packaging.
Return procedure for MAX77533BEWC12+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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