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Analog Devices Inc./Maxim Integrated MAX77533BEWC33+
- Part No.:
- MAX77533BEWC33+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 12-WFBGA, WLBGA
- Datasheet:
-
MAX77533BEWC33+.pdf
- Description:
- HIGH-EFFICIENCY BUCK REGULATOR
- Quantity:
- Payment:
- Shipping:
Inventory:1,323
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Product details
Overview
MAX77533BEWC33+ 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 powered portable electronics. 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-preset 1.2V/1.8V/3.3V options. Its 9μA quiescent current in SKIP mode enables extended battery life in drones, HD cameras, and space-constrained notebooks.
For engineers reviewing the MAX77533BEWC33+ datasheet, MAX77533BEWC33+ pinout, MAX77533BEWC33+ application, or MAX77533BEWC33+ equivalent, key selection considerations include its 12-bump WLP package (1.85mm × 1.4mm), 1MHz/550kHz fixed-frequency operation, hardware enable (EN) and power-OK (POK) signals, cycle-by-cycle current limiting, and integrated active discharge resistor for fast output discharge.
Technical Context
The MAX77533BEWC33+ employs peak current-mode PWM control with slope compensation and internal current-sense circuitry, delivering precise cycle-by-cycle inductor current regulation and inherent line-voltage feedforward. Its high-gain integrator-based feedback eliminates steady-state output voltage error under heavy load.
It supports dual operating modes: SKIP mode for ultra-low IQ (9μA typ at 12VSUP/1.8VOUT) and forced-PWM (FPWM) for low-noise, constant-frequency operation. Mode selection is configurable via I²C register or hardware bias enable (BIASEN), while buck enable (EN) provides independent hardware control independent of I²C state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 14V - supports direct connection to 2S/3S Li-ion packs (7.2V–12.6V) and USB-C PD sources without pre-regulation. |
| Output Current | 1.5A continuous - sufficient for core logic rails in portable SoCs and image sensors in HD cameras and drones. |
| Quiescent Current | 9μA typical in SKIP mode (12VSUP, 1.8VOUT) - extends battery runtime during system sleep states. |
| Switching Frequency | 1MHz (typ) or 550kHz - higher frequency enables smaller external inductors (e.g., 2.2μH 2520 case); lower frequency improves light-load efficiency. |
| Output Accuracy | ±1% over temperature (−40°C to +85°C) for 3.3V factory default - ensures stable core voltage for microcontrollers and FPGAs. |
| Protection Features | Cycle-by-cycle current limit, hiccup-mode short-circuit protection, thermal shutdown (+165°C), UVLO (2.9V), and active discharge (100Ω) - enables robust operation in unattended portable systems. |
| Package | 12-bump wafer-level package (WLP), 1.85mm × 1.4mm × 0.7mm, 0.4mm pitch - meets stringent PCB area constraints in ultra-thin devices. |
Pinout & Package
The MAX77533BEWC33+ uses a 12-bump WLP (package code W121A1+3) with 0.4mm pitch in a 3×4 array (1.85mm × 1.4mm footprint, max height 0.7mm). Bump layout is top-view (bump side down).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1: BST | High-side gate driver supply | Requires 0.22μF ceramic capacitor to LX; critical for high-side MOSFET turn-on and efficiency at high duty cycles. |
| A2: SUP | Main input supply | 3V–14V input; must be bypassed with 4.7μF ceramic capacitor near the pin to suppress switching noise and ensure stability. |
| A3: LX | Switching node | Connects to inductor; high-impedance when disabled; routing requires minimum loop area to reduce EMI and voltage spikes. |
| A4: PGND | Power ground | High-current return path for LX and SUP; must be solidly connected to AGND on PCB to minimize ground bounce. |
| B4: AGND | Analog ground | Low-noise reference for FB, VL, and internal circuits; tied to PGND at single point to avoid noise coupling. |
| C4: OUT/FB | Output sense / feedback input | Internal feedback: connects directly to output cap; external feedback: connects to resistor divider for programmable VOUT. |
| C2: VL | Internal LDO output (1.8V) | Powers internal logic; requires 2.2μF ceramic bypass to AGND; not for external loading. |
| B3: POK | Open-drain power-OK signal | Asserts high when VOUT is within ±2% of target; requires external 10kΩ–100kΩ pullup; used for system sequencing. |
| B2: EN | Hardware enable input | Active-high (VHI = 1.1V); controls buck independently of I²C; compatible with 3.3V/5V logic domains. |
| C3: BIASEN | I²C interface enable | Enables SDA/SCL without enabling buck output; allows register access during standby for dynamic voltage scaling. |
| B1: SDA | I²C data line | Open-drain; supports standard/fast-mode I²C (1MHz max); tie to GND if unused to prevent floating. |
| C1: SCL | I²C clock line | Input-only; 1MHz max clock; tie to GND if unused to prevent unintended communication. |
Key Features
| Feature | Design Value |
|---|---|
| 1.5A synchronous buck regulator | Integrated high-side (90mΩ) and low-side (55mΩ) DMOS FETs eliminate external MOSFETs and reduce BOM count and board area. |
| I²C programmability (0.8V–5V @ 50mV steps) | Enables dynamic voltage scaling for SoC cores and peripherals, reducing system power by up to 30% during low-activity states. |
| Factory-default output voltages (1.2V/1.8V/3.3V) | Eliminates external resistors and feed-forward capacitors for common rails, simplifying design and improving accuracy vs. discrete feedback. |
| 9μA quiescent current in SKIP mode | Extends battery life in always-on sensor nodes and wearable devices by minimizing idle power loss without sacrificing startup time. |
| Integrated active discharge (100Ω) | Forces rapid output voltage decay (<1ms) when disabled, preventing back-powering of downstream circuitry and meeting safety requirements. |
| Dedicated EN and POK pins | Enables deterministic power sequencing in multi-rail systems without software intervention-critical for FPGA and processor boot reliability. |
Applications
| Drone Flight Controller Power | HD Camera Image Sensor Rail |
|---|---|
Use Scenario: Powers FPGA, IMU, and radio transceiver in compact quadcopter flight controllers where thermal headroom and PCB area are severely constrained. IC Role / Device Role / Timing Role: Primary 3.3V/1.8V synchronous buck regulator supplying core logic and memory interfaces with tight transient response. Use Value: 94% peak efficiency at 7.4VSUP/3.3VOUT minimizes heat generation; 12-bump WLP saves >40% board area versus QFN alternatives. |
Use Scenario: Supplies 1.2V core voltage to high-resolution CMOS image sensors in action cameras, requiring low noise and fast load-step response. IC Role / Device Role / Timing Role: High-PSRR, low-noise buck converter with FPWM mode enabled to suppress switching artifacts in analog pixel outputs. Use Value: ±1% output accuracy ensures consistent sensor gain calibration; 1MHz switching allows use of tiny 2.2μH inductors for minimal profile. |
| Notebook System-on-Chip Core Rail | USB-C Powered Portable Monitor |
Use Scenario: Delivers dynamically scaled 0.8V–1.2V to ARM Cortex-A series SoCs in thin-and-light notebooks, adapting voltage per performance state. IC Role / Device Role / Timing Role: I²C-configurable buck regulator supporting DVFS via OS-controlled register writes during CPU frequency transitions. Use Value: 50mV I²C resolution enables precise voltage binning; 9μA IQ preserves battery charge during idle display-off states. |
Use Scenario: Steps down 9V/15V/20V USB-C PD input to 3.3V for display controller and backlight driver in portable monitors. IC Role / Device Role / Timing Role: Wide-input buck converter with UVLO (2.9V) and hiccup-mode protection handling variable PD source voltages and cable drop. Use Value: 3V–14V input range covers full USB-C PD specification; POK signal synchronizes display initialization with stable 3.3V rail. |
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, 1.8V VL supply, 2.5V–5.5V input - narrower VIN range, no I²C, no factory-programmable variants. | Best suited for fixed 1.8V loads in space-constrained IoT hubs where USB-C or multi-cell battery input is not required. | Select when absolute minimum solution size is critical and input is limited to single-cell Li-ion or 3.3V/5V rails. |
| RTQ2134BGQW | 1.5A, 2.5V–5.5V input, 0.6V–5.5V I²C-adjustable output, 12-pin QFN (2mm × 2mm) - wider VOUT range but no factory defaults or active discharge. | Preferred for industrial HMIs needing wide output flexibility and higher ambient temperature tolerance (−40°C to +125°C). | Choose when operating above +85°C or requiring sub-0.8V outputs; avoid if active discharge or 3.3V factory preset is mandatory. |
Compared with TPS6286418RTER and RTQ2134BGQW, the MAX77533BEWC33+ uniquely combines USB-C/2S–3S battery input support, factory-preset voltages, integrated active discharge, and ultra-low 9μA quiescent current-making it optimal for portable consumer electronics demanding both efficiency and design simplicity.
Availability
MAX77533BEWC33+ is available at Aetrix Electronics and suitable for drone flight controllers, HD camera sensor rails, and USB-C powered portable monitors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX77533BEWC33+ 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. following the Maxim Integrated acquisition) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The MAX77533BEWC33+ belongs to the MAX77xxx family of highly integrated power management ICs designed specifically for space- and power-constrained portable electronics including wearables, drones, and ultraportable computing devices.
FAQ
What is the maximum input voltage rating for the MAX77533BEWC33+?
The MAX77533BEWC33+ has an absolute maximum input voltage (SUP to PGND) of +16V, but its recommended operating input range is 3V to 14V. Exceeding 14V may trigger undervoltage lockout recovery or cause stress beyond guaranteed specifications. For USB-C PD applications, this range safely accommodates 9V, 12V, and 15V profiles with margin for cable drop.
Does the MAX77533BEWC33+ support dynamic voltage scaling via I²C?
Yes, the MAX77533BEWC33+ supports full dynamic voltage scaling through its I²C interface, allowing real-time adjustment of output voltage from 0.8V to 5V in precise 50mV increments. This capability is implemented via dedicated VOUT register writes and is fully functional regardless of whether the device is configured with internal or external feedback.
What is the purpose of the BIASEN pin on the MAX77533BEWC33+?
The BIASEN pin on the MAX77533BEWC33+ enables the I²C interface (SDA/SCL) independently of the buck converter output. When asserted high, it powers internal logic and allows register access for configuration-even when EN is low and the output is disabled. This enables pre-boot setup, fault logging, or voltage reprogramming during system standby.
How does the active discharge feature work on the MAX77533BEWC33+?
The MAX77533BEWC33+ integrates a 100Ω active discharge resistor between OUT and PGND, enabled automatically when the buck is disabled (EN = low). This discharges the output capacitor rapidly-typically within 1ms-preventing back-powering of downstream circuitry and ensuring safe, predictable power-down sequencing in multi-rail systems.
Can the MAX77533BEWC33+ operate without external feedback resistors?
Yes, the MAX77533BEWC33+ supports three factory-programmed internal feedback options: 1.2V, 1.8V, and 3.3V. These eliminate the need for external resistors and feed-forward capacitors, reducing component count and layout complexity. The specific default voltage is determined by the suffix (e.g., BEWC33+ = 3.3V), and no external components are required for basic operation.
MAX77533BEWC33+ 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+ FAQ
1.How can I place an order for MAX77533BEWC33+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77533BEWC33+ 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+ reliable?
The price and inventory of MAX77533BEWC33+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77533BEWC33+ is usually 5 days.
3.What payment methods are accepted for MAX77533BEWC33+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77533BEWC33+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77533BEWC33+?
MAX77533BEWC33+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77533BEWC33+ 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+?
For technical support, including MAX77533BEWC33+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77533BEWC33+ requirements.
6.How does Aetrix verify that MAX77533BEWC33+ is sourced from the original manufacturer or authorized distributors?
All MAX77533BEWC33+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX77533BEWC33+?
All MAX77533BEWC33+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX77533BEWC33+, 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+ part is unused and in its original packaging.
Return procedure for MAX77533BEWC33+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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