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Analog Devices Inc./Maxim Integrated MAX77533BEWC33+T
- Part No.:
- MAX77533BEWC33+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 12-WFBGA, WLBGA
- Datasheet:
-
MAX77533BEWC33+T.pdf
- Description:
- HIGH-EFFICIENCY BUCK REGULATOR
- Quantity:
- Payment:
- Shipping:
Inventory:4,750
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Product details
Overview
MAX77533BEWC33+T from Analog Devices is a synchronous 1.5A step-down DC-DC converter optimized for 2-cell/3-cell Li+-powered portable devices and USB-C systems. It operates from 3V to 14V input, delivers factory-programmed 3.3V output (±1% accuracy), achieves 94% peak efficiency at 7.4VSUP/3.3VOUT, and draws only 9μA quiescent current in SKIP mode - enabling extended battery life in space-constrained drones, HD cameras, and notebooks.
For engineers reviewing the MAX77533BEWC33+T datasheet, MAX77533BEWC33+T pinout, MAX77533BEWC33+T application, or MAX77533BEWC33+T equivalent, key selection criteria include its 12-bump WLP package (1.85mm × 1.4mm), I²C programmability with 50mV output steps, hardware enable/POK control, and integrated protection including cycle-by-cycle current limit, hiccup-mode short-circuit response, and thermal shutdown.
Technical Context
The MAX77533BEWC33+T implements a fixed-frequency (1MHz or 550kHz) peak current-mode PWM control architecture with integrated slope compensation and high-gain error amplification. Its synchronous rectification uses internal high-side (90–180mΩ) and low-side (55–110mΩ) DMOS switches, with configurable peak inductor current limits (500mA or 2A) and valley-current detection for light-load SKIP mode entry.
It supports dual feedback paths: internal resistor network for factory-default 3.3V output (±1.2% over -40°C to +85°C), or external resistor divider for 0.8V–99%VSUP adjustment. The VL regulator provides a dedicated 1.8V internal supply, while dedicated EN, BIASEN, and open-drain POK pins enable robust hardware sequencing without I²C dependency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 14V - supports direct connection to 2S/3S Li-ion packs (7.4V/11.1V nominal) and USB-C PD sources. |
| Output Voltage | Factory-set 3.3V (±1.2% over full temp/load range) - eliminates external feedback resistors for standard rail generation. |
| Max Output Current | 1.5A continuous - sufficient for powering SoCs, sensors, and RF modules in portable edge devices. |
| Quiescent Current | 9μA at 12VSUP/1.8VOUT in SKIP mode - extends battery runtime during sleep/idle states. |
| Switching Frequency | 1MHz (default) or 550kHz - enables compact 2.2μH inductors while balancing EMI and efficiency trade-offs. |
| Protection Features | Cycle-by-cycle current limit, hiccup-mode short-circuit response, UVLO (2.9V threshold), thermal shutdown (+165°C), and active discharge (100Ω) - ensures safe operation under fault conditions. |
| Package | 12-bump WLP (1.85mm × 1.4mm, 0.4mm pitch, 0.7mm max height) - ultra-small footprint for high-density PCB layouts. |
Pinout & Package
MAX77533BEWC33+T is housed in a 12-bump wafer-level package (WLP) measuring 1.85mm × 1.4mm with 0.4mm pitch and 0.7mm maximum height. Bump layout follows a 3×4 array (A1–C4).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1: BST | High-side gate driver bootstrap supply | Requires 0.22μF ceramic capacitor to LX; critical for high-side FET turn-on and stable regulation. |
| A2: SUP | Main power input (3V–14V) | Must be bypassed with 4.7μF ceramic capacitor near pin; feeds both buck stage and internal VL regulator. |
| A3: LX | Switching node | Connects to inductor; high-impedance when disabled; requires low-inductance routing to minimize EMI. |
| A4: PGND | Power ground return | Primary return path for high-current switching; must be connected directly to AGND on PCB. |
| B4: AGND | Analog/quiet ground | Reference for feedback and I²C; tied to PGND at single point to avoid noise coupling into sensitive nodes. |
| C4: OUT/FB | Output voltage sense / feedback input | Configured as output sense pin for 3.3V factory default; connects to output capacitor positive terminal. |
| C2: VL | Dedicated 1.8V internal supply output | Provides regulated bias for internal logic; bypassed with 2.2μF capacitor; not for external loading. |
| B3: POK | Open-drain Power-OK indicator | Signals valid output (90–94% of target); requires external 10kΩ–100kΩ pullup; used for system power sequencing. |
| B2: EN | Hardware enable input | Active-high logic (1.1V threshold); enables/disables buck output independently of I²C; compatible with SUP domain. |
| C3: BIASEN | I²C interface enable | Activates SDA/SCL logic without enabling buck output - allows register access during standby. |
| B1: SDA | I²C data line | Open-drain bidirectional interface; pulled up externally; used for dynamic voltage scaling and configuration. |
| C1: SCL | I²C clock line | Drives I²C timing; requires external pullup; supports 1MHz clock for fast register updates. |
Key Features
| Feature | Design Value |
|---|---|
| 1.5A synchronous buck topology | Eliminates external Schottky diode, reducing component count and improving efficiency by >5% vs. asynchronous designs. |
| 9μA quiescent current in SKIP mode | Extends battery life in always-on sensor nodes and low-power IoT endpoints without sacrificing startup time. |
| Factory-programmed 3.3V output | Removes need for external feedback resistors and feed-forward capacitors - simplifies BOM and layout for standard rail use. |
| Dual enable architecture (EN + BIASEN) | Enables independent control of power delivery (EN) and communication (BIASEN), supporting flexible power-state management. |
| Integrated active discharge (100Ω) | Forces rapid output voltage decay (<1ms) after disable, preventing latch-up in multi-rail systems with strict sequencing requirements. |
| Hiccup-mode short-circuit protection | Shuts down output and retries every 12ms (internal feedback version), limiting average fault power and preventing thermal runaway. |
Applications
| Drone Flight Controller Power | USB-C Powered HD Camera |
|---|---|
|
Use Scenario: Powers FPGA, IMU, and wireless transceiver from 3S LiPo (11.1V) with tight thermal constraints and burst current demands. IC Role / Device Role / Timing Role: Primary 3.3V system rail regulator delivering 1.5A peak current with fast transient response and hiccup-mode fault containment. Use Value: Factory-set 3.3V output eliminates tuning effort; 94% efficiency at 1A reduces heat dissipation in sealed enclosures. |
Use Scenario: Supplies image sensor and video encoder from USB-C PD source (5V–9V) in compact handheld camera body. IC Role / Device Role / Timing Role: High-density buck converter providing clean, sequenced 3.3V rail with POK signaling for firmware-controlled power-up. Use Value: 12-bump WLP fits within 2mm board margin; POK pin enables precise synchronization with sensor initialization sequence. |
| Notebook Subsystem Regulator | Portable Medical Monitor |
|
Use Scenario: Generates 3.3V for touch controller, audio codec, and display interface in thin-and-light notebook chassis. IC Role / Device Role / Timing Role: Secondary buck regulator operating from main 12V rail, featuring low-noise operation and soft-start control. Use Value: 1ms default soft-start prevents inrush current on shared input bus; VL regulator isolates analog circuitry from switching noise. |
Use Scenario: Powers patient interface electronics (ECG front-end, OLED display) from 2S Li-ion (7.4V) with clinical-grade reliability. IC Role / Device Role / Timing Role: Safety-critical power stage with UVLO, thermal shutdown, and active discharge for fail-safe shutdown. Use Value: Integrated protections eliminate need for external supervisors; ±1.2% output accuracy meets medical device voltage tolerance specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS6286418RTER | 1.8V fixed output, 2A rating, 1.8mm × 1.6mm QFN-11 package, no I²C interface | Lacks programmability and POK output; suited for cost-sensitive, non-sequenced rails | Select when 1.8V output suffices and board space allows larger QFN; avoid if 3.3V or sequencing is required. |
| RTQ2132BGQW | 3.3V fixed output, 2A rating, 1.6mm × 1.6mm WLCSP-12 package, 12μA IQ, no I²C | Similar WLP size but no digital interface; lower efficiency at light load (12μA vs. 9μA) | Choose for simpler design where I²C configuration is unnecessary and slightly higher IQ is acceptable. |
Compared with TPS6286418RTER and RTQ2132BGQW, the MAX77533BEWC33+T uniquely combines factory-set 3.3V output, ultra-low 9μA quiescent current, POK signaling, and I²C configurability in a 1.85mm × 1.4mm WLP - making it optimal for space-constrained, battery-powered systems requiring precise power sequencing and long standby life.
Availability
MAX77533BEWC33+T is available at Aetrix Electronics and suitable for drone flight controllers, USB-C powered HD cameras, and portable medical monitors requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX77533BEWC33+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 (now part of Analog Devices, Inc., formerly Maxim Integrated) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and consumer markets.
The MAX77533BEWC33+T belongs to the MAX775xx family of high-efficiency, ultra-small buck converters designed specifically for space- and power-constrained portable electronics - emphasizing minimal external components, low IQ, and robust protection for battery-operated systems.
FAQ
What is the factory-programmed output voltage of the MAX77533BEWC33+T?
The MAX77533BEWC33+T is factory-programmed for a fixed 3.3V output voltage with ±1.2% accuracy across -40°C to +85°C ambient temperature and 0mA–1.5A load range. This eliminates the need for external feedback resistors and simplifies design for standard 3.3V rail applications. The 3.3V setting is hard-coded in the internal feedback network and cannot be altered via I²C.
Does the MAX77533BEWC33+T require an external I²C pull-up resistor?
Yes, the MAX77533BEWC33+T requires external pull-up resistors on both SDA and SCL pins for I²C operation. Typical values are 4.7kΩ to 10kΩ connected to VL (1.8V) or another appropriate logic supply. Without pull-ups, the open-drain I²C interface will not function. If I²C is unused, SDA and SCL must be grounded per datasheet guidance.
Can the MAX77533BEWC33+T operate without connecting the VL pin?
No - the VL pin must be bypassed with a 2.2μF ceramic capacitor to AGND and must not be left floating or unconnected. VL supplies the internal logic and I²C interface; failure to properly decouple VL risks unstable operation, I²C communication failure, or erratic enable behavior. External loading of VL is prohibited and may damage the device.
What is the purpose of the BIASEN pin on the MAX77533BEWC33+T?
The BIASEN pin on the MAX77533BEWC33+T enables the I²C interface independently of the buck converter output. When BIASEN is high, SDA and SCL become active for register read/write operations - even when EN is low and the output is disabled. This allows firmware to configure registers (e.g., soft-start, frequency) before power-up or during standby, supporting advanced power-state management.
How does the POK (Power-OK) output behave on the MAX77533BEWC33+T?
The POK pin on the MAX77533BEWC33+T is an open-drain output that goes low when VOUT falls below 88–90% of the 3.3V target and goes high-impedance when VOUT rises above 90–94%. It requires an external pull-up resistor (10kΩ–100kΩ) and is used for system-level power sequencing - for example, releasing reset to an MCU only after the 3.3V rail is stable. POK assertion delay is typically <100μs.
MAX77533BEWC33+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:
- 3.3V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-WLP (1.85x1.4)
MAX77533BEWC33+T FAQ
1.How can I place an order for MAX77533BEWC33+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77533BEWC33+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 MAX77533BEWC33+T reliable?
The price and inventory of MAX77533BEWC33+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77533BEWC33+T is usually 5 days.
3.What payment methods are accepted for MAX77533BEWC33+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77533BEWC33+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77533BEWC33+T?
MAX77533BEWC33+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77533BEWC33+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 MAX77533BEWC33+T?
For technical support, including MAX77533BEWC33+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77533BEWC33+T requirements.
6.How does Aetrix verify that MAX77533BEWC33+T is sourced from the original manufacturer or authorized distributors?
All MAX77533BEWC33+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 MAX77533BEWC33+T meets industry standards.
7.What is the process for return or replacement of MAX77533BEWC33+T?
All MAX77533BEWC33+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX77533BEWC33+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 MAX77533BEWC33+T part is unused and in its original packaging.
Return procedure for MAX77533BEWC33+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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