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Analog Devices Inc./Maxim Integrated MAX77533AEWC+T
- Part No.:
- MAX77533AEWC+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 12-WFBGA, WLBGA
- Datasheet:
-
MAX77533AEWC+T.pdf
- Description:
- HIGH-EFFICIENCY BUCK REGULATOR
- Quantity:
- Payment:
- Shipping:
Inventory:2,460
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Product details
Overview
The MAX77533AEWC+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 powered portable systems. 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), features 9μA quiescent current in SKIP mode, and integrates dedicated EN and POK pins for hardware control - deployed in drones, HD cameras, and space-constrained notebooks.
For engineers reviewing the MAX77533AEWC+T datasheet, MAX77533AEWC+T pinout, MAX77533AEWC+T application, or MAX77533AEWC+T equivalent, key selection criteria include its 12-bump WLP package (1.85mm × 1.4mm), factory-default 1.2V/1.8V/3.3V internal feedback options, 1MHz/550kHz fixed-frequency operation, cycle-by-cycle current limiting, and active discharge capability for fast output discharge during disable.
Technical Context
The MAX77533AEWC+T implements a peak current-mode PWM control scheme with integrated slope compensation and high-gain error amplification, enabling precise cycle-by-cycle inductor current regulation and inherent line-voltage rejection. Its synchronous rectification uses internal high-side (90–180mΩ) and low-side (55–110mΩ) DMOS switches, with minimum on-time of 100ns and maximum duty cycle up to 99% for dropout operation.
Control flexibility includes hardware enable (EN), bias-enable (BIASEN) for I²C-only activation, and optional full I²C configuration (slave address selectable) supporting dynamic voltage scaling. Protection architecture combines undervoltage lockout (2.8V–3.0V threshold), thermal shutdown at +165°C, hiccup-mode short-circuit response, and active discharge (100Ω internal resistor) for internal-feedback versions only.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 14V - supports 2-cell (6–8.4V) and 3-cell (9–12.6V) Li-ion batteries plus USB-C PD sources. |
| Output Current | 1.5A continuous - sufficient for core logic rails in portable SoCs and imaging processors. |
| Quiescent Supply Current | 9μA typical (12VSUP, 1.8VOUT, internal feedback) - extends battery runtime in standby/sleep states. |
| Switching Frequency | 1MHz (or 550kHz for ≤1.5V outputs) - enables compact 2.2μH inductors and reduces output ripple. |
| Output Voltage Accuracy | ±1% over temperature (e.g., 1.176V–1.224V for 1.2V default) - ensures stable core voltage for sensitive digital loads. |
| Package Dimensions | 1.85mm × 1.4mm × 0.7mm WLP - ultra-small footprint ideal for PCB area-constrained mobile designs. |
| Protection Features | Cycle-by-cycle current limit (350–2200mA), thermal shutdown (+165°C), hiccup-mode short-circuit, UVLO, and active discharge - ensures robust operation under fault conditions. |
Pinout & Package
The MAX77533AEWC+T is housed in a 12-bump, 0.4mm pitch wafer-level package (WLP) measuring 1.85mm × 1.4mm × 0.7mm max height, with a 3×4 bump array (A1–C4).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | High-side FET driver supply | Requires 0.22μF ceramic capacitor to LX; critical for gate drive integrity and efficiency. |
| SUP | Main input power supply | 3V–14V input; bypassed with 4.7μF ceramic cap to PGND for low-impedance path and EMI suppression. |
| LX | Switching node | Connects to external inductor; high-impedance when disabled; routing must minimize parasitic inductance. |
| PGND | Power ground | Primary return path for high-current switching loop; must be solidly connected to AGND on PCB. |
| OUT/FB | Output sense / feedback input | Internal feedback: connects to output cap; external feedback: connects to resistor divider and 100pF feed-forward cap. |
| EN | Hardware enable input | Active-high logic (1.1V threshold); controls buck output directly; interacts with I²C EN_BIT register. |
| POK | Open-drain Power-OK output | Signals valid output voltage (90–94% of target); requires external 10kΩ–100kΩ pull-up resistor. |
| VL | Internal low-voltage IC supply | 1.8V regulated output for internal circuitry; bypassed with 2.2μF cap to AGND; not for external loading. |
| BIASEN | I²C interface enable | Activates I²C logic without enabling buck output; allows register access during system sleep. |
| SDA / SCL | I²C serial data/clock | Standard 1MHz I²C interface; pins must be grounded if unused to prevent floating inputs. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ SKIP mode | 9μA typical supply current enables >90% efficiency at 100μA load - critical for battery longevity in always-on subsystems. |
| Factory-programmed output voltages | 1.2V, 1.8V, or 3.3V defaults eliminate external resistors and reduce BOM count for common processor/core rails. |
| Dual control architecture | Independent EN (hardware) and BIASEN (I²C-only) pins allow flexible power sequencing - e.g., configure registers before enabling output. |
| Integrated active discharge | 100Ω internal resistor discharges output capacitors rapidly upon disable - prevents residual voltage from interfering with downstream logic. |
| Robust protection suite | Cycle-by-cycle current limit, hiccup-mode short-circuit recovery, thermal shutdown with 15°C hysteresis, and UVLO ensure safe operation across environmental extremes. |
Applications
| Drone Flight Controller Power | HD Camera Image Sensor Rail |
|---|---|
Use Scenario: Powers FPGA-based flight controller requiring stable 1.2V core voltage from 3S LiPo battery (9–12.6V). IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering 1.5A with tight output accuracy and fast transient response. Use Value: Factory-default 1.2V output eliminates feedback resistors; 9μA IQ extends flight time during hover/idle; POK confirms rail readiness before autopilot initialization. |
Use Scenario: Supplies 1.8V analog front-end for CMOS image sensor in compact action camera. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with minimal board area and low noise. Use Value: 1MHz switching enables tiny 2.2μH inductor; WLP package fits tight camera module layout; active discharge clears residual voltage before sensor reset. |
| Notebook CPU Core Logic | USB-C Powered Portable Monitor |
Use Scenario: Generates 3.3V I/O rail for embedded controller and display interface in fanless ultrabook. IC Role / Device Role / Timing Role: Secondary buck converter with hardware enable synchronized to system power state. Use Value: Factory-set 3.3V option reduces component count; EN/POK pins integrate cleanly into ACPI power sequencing; thermal shutdown protects against enclosure overheating. |
Use Scenario: Steps down USB-C PD 9V/12V input to 5.0V for monitor backlight and TCON logic. IC Role / Device Role / Timing Role: Adjustable-output buck using external feedback to precisely set 5.0V with 99% VSUP headroom. Use Value: I²C programmability allows firmware tuning of VOUT during manufacturing calibration; 14V absolute max rating accommodates USB-C voltage transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS628641RQYR | 1.2A output, 2.7V–6V input, 0.6V–5.5V output, 1.8mm × 1.0mm DSBGA | Narrower input range limits use to single-cell or USB-PD 5V sources; lower current rating suits smaller SoCs. | Select when input is strictly ≤6V and load current ≤1.2A; preferred for cost-sensitive consumer wearables. |
| RTQ2134BGQW | 2A output, 2.7V–17V input, 0.6V–5.5V output, 2.0mm × 2.0mm QFN-12 | Larger QFN package increases PCB area; higher current and wider input support industrial-grade 3S/4S battery stacks. | Choose for higher load margin or extended input range beyond 14V; suitable where thermal performance outweighs size constraints. |
Compared with TPS628641RQYR and RTQ2134BGQW, the MAX77533AEWC+T uniquely balances ultra-compact WLP size, 1.5A capability, and dual-mode control (EN + BIASEN) - making it optimal for space-limited, battery-powered systems needing both hardware simplicity and firmware configurability.
Availability
The MAX77533AEWC+T is available at Aetrix Electronics and suitable for drone flight controllers, HD camera sensor rails, and notebook CPU core logic requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX77533AEWC+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 MAX77533AEWC+T belongs to Analog Devices' MAX® power management portfolio, designed specifically for high-density, battery-operated portable electronics demanding ultra-low quiescent current, small form factor, and flexible control interfaces.
FAQ
What is the maximum input voltage rating for the MAX77533AEWC+T?
The MAX77533AEWC+T has an absolute maximum input voltage (SUP to PGND) of +16V, with recommended operating range from 3V to 14V. This 14V upper limit safely accommodates nominal 3-cell Li-ion (12.6V) and USB-C PD (9V/12V/15V) sources while providing margin for transient spikes - critical for reliable operation in portable battery systems.
Does the MAX77533AEWC+T support both internal and external feedback configurations?
Yes, the MAX77533AEWC+T supports two distinct feedback modes: internal feedback with factory-default outputs (1.2V, 1.8V, or 3.3V) that require no external resistors, and external feedback using a resistor divider to set VOUT from 0.8V to 99% of VSUP. The OUT/FB pin function changes accordingly, and the device's electrical characteristics (e.g., FB voltage accuracy ±1%) apply specifically to the selected mode.
How does the active discharge feature work on the MAX77533AEWC+T?
The MAX77533AEWC+T provides an internal 100Ω active discharge resistor between OUT and PGND, but only for internal-feedback versions. When the buck output is disabled (EN = low), this resistor automatically discharges the output capacitor to near-zero volts within milliseconds - preventing residual voltage from causing latch-up or false wake-up in downstream logic. External-feedback versions do not include this feature.
What are the I²C timing requirements for the MAX77533AEWC+T?
The MAX77533AEWC+T supports standard-mode I²C with a maximum clock frequency of 1MHz. Key timing specs include tLOW ≥ 500ns, tHIGH ≥ 260ns, data setup time tSU;DAT ≥ 50ns, and bus free time tBUF ≥ 0.5μs. These values ensure compatibility with most microcontroller I²C peripherals and enable reliable register read/write operations for dynamic voltage scaling and status monitoring.
Can the MAX77533AEWC+T operate in forced-PWM mode, and what is its impact on efficiency?
Yes, the MAX77533AEWC+T supports selectable forced-PWM (FPWM) mode, which maintains constant 1MHz switching regardless of load. In FPWM mode, quiescent current rises to 1–1.5mA (vs. 9μA in SKIP), reducing light-load efficiency but eliminating audible switching noise and ensuring predictable EMI behavior - ideal for noise-sensitive analog circuits or deterministic timing applications where ripple consistency matters more than battery life.
MAX77533AEWC+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:
- 0.8V ~ 5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-WLP (1.85x1.4)
MAX77533AEWC+T FAQ
1.How can I place an order for MAX77533AEWC+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77533AEWC+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 MAX77533AEWC+T reliable?
The price and inventory of MAX77533AEWC+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77533AEWC+T is usually 5 days.
3.What payment methods are accepted for MAX77533AEWC+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77533AEWC+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77533AEWC+T?
MAX77533AEWC+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77533AEWC+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 MAX77533AEWC+T?
For technical support, including MAX77533AEWC+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77533AEWC+T requirements.
6.How does Aetrix verify that MAX77533AEWC+T is sourced from the original manufacturer or authorized distributors?
All MAX77533AEWC+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 MAX77533AEWC+T meets industry standards.
7.What is the process for return or replacement of MAX77533AEWC+T?
All MAX77533AEWC+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX77533AEWC+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 MAX77533AEWC+T part is unused and in its original packaging.
Return procedure for MAX77533AEWC+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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