My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX77503BEWC33+T
- Part No.:
- MAX77503BEWC33+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 12-WFBGA, WLBGA
- Datasheet:
-
MAX77503BEWC33+T.pdf
- Description:
- IC REG BUCK 3.3V 1.5A 12WLP
- Quantity:
- Payment:
- Shipping:
Inventory:1,149
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX77503BEWC33+T from Maxim Integrated is a synchronous 1.5A step-down DC-DC converter optimized for 2-cell/3-cell Li+/Li-ion battery and USB-C portable 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 features 9μA quiescent current in SKIP mode - enabling extended runtime in space-constrained drones, HD cameras, and notebooks.
For engineers reviewing the MAX77503BEWC33+T datasheet, MAX77503BEWC33+T pinout, MAX77503BEWC33+T application, or MAX77503BEWC33+T equivalent, key selection considerations include its 12-bump WLP package (1.85mm × 1.4mm), I²C programmability with 50mV output steps, hardware enable/power-OK interface, cycle-by-cycle current limiting, and integrated active discharge for fast output discharge.
Technical Context
The MAX77503BEWC33+T implements a peak current-mode PWM control architecture with integrated slope compensation and high-gain error amplifier, ensuring stable regulation across 3V–14V input and 3.3V output under dynamic load transients. Its internal feedback path eliminates external resistor networks while supporting optional I²C reconfiguration of VOUT between 0.8V and 5V.
It integrates dual MOSFET drivers (90mΩ high-side / 55mΩ low-side RDS(on)), 1MHz fixed-frequency switching (or 550kHz for lower EMI), and configurable soft-start (1–8ms). Protection includes cycle-by-cycle peak current limit (2A), hiccup-mode short-circuit response, thermal shutdown at +165°C, and active discharge via 100Ω internal resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.5A continuous - supports core logic rails in portable SoC platforms without external current boosting. |
| Input Voltage Range | 3V to 14V - compatible with 2S/3S Li-ion packs (6.4V–12.6V) and USB-C PD sources (5V–14V). |
| Output Voltage | Factory-set 3.3V ±1% - eliminates external feedback resistors and reduces BOM count for standard I/O rail generation. |
| Quiescent Current | 9μA typical (12VSUP, 1.8VOUT) - extends battery life in always-on sensor or standby subsystems. |
| Switching Frequency | 1MHz (FPWM) or variable in SKIP mode - enables compact 2.2μH inductor selection and minimizes solution footprint. |
| Efficiency | 94% peak at 7.4VSUP/3.3VOUT - reduces thermal stress in sealed enclosures like drones and handheld cameras. |
| Protection Features | Cycle-by-cycle current limit, hiccup-mode short-circuit, thermal shutdown, UVLO, and active discharge - ensures robust operation during fault conditions without external circuitry. |
Pinout & Package
MAX77503BEWC33+T uses a 12-bump wafer-level package (WLP) measuring 1.85mm × 1.4mm × 0.7mm max height, with 0.4mm pitch and 3×4 bump array. The package is RoHS-compliant and designed for high-density PCB layouts in ultra-thin portable devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | High-side gate driver supply | Requires 0.22μF ceramic capacitor to LX; critical for proper high-side FET turn-on and efficiency. |
| SUP | Main power input | 3V–14V supply input; bypassed with 4.7μF ceramic capacitor near IC for low-impedance path. |
| LX | Switching node | Connects to inductor; high-impedance when disabled; must be routed with minimal loop area to reduce EMI. |
| PGND | Power ground | Primary return path for high-current switching; tied directly to AGND on PCB for noise isolation. |
| OUT/FB | Output voltage sense | Direct connection to output capacitor positive terminal; enables precise 3.3V regulation without external dividers. |
| VL | Internal LDO output | 1.8V regulated supply for internal logic; bypassed with 2.2μF capacitor; not for external loading. |
| EN | Hardware enable input | Logic-high (>1.1V) enables buck; compatible with SUP domain; interacts with I²C EN_BIT register. |
| POK | Open-drain power-ok output | Asserts when VOUT reaches 90–94% of target; requires external 10kΩ–100kΩ pull-up for system sequencing. |
| BIASEN | I²C interface enable | Activates SDA/SCL logic without enabling buck output - allows pre-power-up register configuration. |
| SDA / SCL | I²C serial interface | Standard 1MHz I²C bus; supports dynamic voltage scaling and real-time telemetry; connect to GND if unused. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ SKIP mode | 9μA typical quiescent current enables >10-day battery life in always-on IoT sensors powered by 2S Li-ion. |
| Factory-programmed 3.3V output | Eliminates external feedback resistors and layout sensitivity - reduces design risk and accelerates qualification. |
| Integrated active discharge | 100Ω internal resistor discharges output within milliseconds after disable - meets fast-power-down requirements in cameras and medical wearables. |
| Dual enable architecture | Independent EN (hardware) and BIASEN (I²C) pins allow flexible power sequencing - e.g., configure registers before enabling output. |
| Robust protection suite | Cycle-by-cycle current limit, hiccup-mode short-circuit, thermal shutdown, and UVLO prevent damage during hot-plug, overloads, or PCB faults. |
Applications
| Drone Flight Controller Power | USB-C Powered HD Camera |
|---|---|
Use Scenario: Powers FPGA-based flight controller and IMU from 3S Li-ion battery (10.8V–12.6V) with strict size and thermal constraints. IC Role / Device Role / Timing Role: Primary 3.3V core rail regulator delivering 1.5A with <1% output variation across -40°C to +85°C ambient. Use Value: 94% peak efficiency and 9μA IQ extend flight time by >8% versus comparable converters; 1.85mm × 1.4mm WLP fits tight camera gimbal PCB real estate. |
Use Scenario: Generates clean 3.3V rail for image sensor and video encoder in compact USB-C powered 4K camera. IC Role / Device Role / Timing Role: Synchronous buck converter with fast transient response to handle burst-mode sensor readout currents up to 1.5A. Use Value: Active discharge clears residual charge in <5ms after disconnect - preventing image corruption during hot-swap; POK signal synchronizes sensor initialization. |
| Notebook Subsystem Rail | Portable Medical Monitor |
Use Scenario: Supplies 3.3V to touch controller, Wi-Fi module, and audio codec in thin-and-light notebook designs. IC Role / Device Role / Timing Role: Always-on power rail with hardware EN control and I²C programmability for firmware-driven voltage margining. Use Value: Factory-default 3.3V eliminates calibration overhead; 1MHz switching allows use of 2.2μH inductor - reducing height to <1.0mm for ultra-slim chassis. |
Use Scenario: Powers patient interface electronics in battery-operated ECG monitor requiring long shelf life and clinical-grade reliability. IC Role / Device Role / Timing Role: Primary 3.3V rail with thermal shutdown (+165°C) and hiccup-mode protection to maintain safe operation during extended use. Use Value: 9μA IQ extends 2-year shelf life; integrated UVLO prevents brownout-induced data loss during battery depletion; RoHS WLP supports lead-free assembly. |
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–5.5V input; no I²C interface; 1.5mm × 1.5mm QFN-8 | Higher current capability but lacks programmability and active discharge; suited for cost-sensitive, non-configurable rails | Select when fixed 1.8V output and higher current headroom are required, and I²C control is unnecessary. |
| RTQ2132BGQW | 3.3V fixed output; 2A rating; 2.5V–5.5V input; no I²C; 1.6mm × 1.6mm WLCSP-12 | Narrower input range limits compatibility with 3S batteries; no active discharge or POK; lower IQ (2.5μA) | Choose for ultra-low-IQ applications powered from single-cell or USB-only sources where 3S battery support is not needed. |
Compared with TPS6286418RTER and RTQ2132BGQW, MAX77503BEWC33+T uniquely combines 3S battery compatibility (3V–14V), factory-set 3.3V precision, I²C configurability, and integrated active discharge - making it optimal for portable systems requiring both flexibility and reliability in constrained form factors.
Availability
MAX77503BEWC33+T is available at Aetrix Electronics and suitable for drone flight controllers, USB-C HD cameras, and notebook subsystems requiring stable component supply, long-term lifecycle support, and RoHS-compliant wafer-level packaging.
Supply support for MAX77503BEWC33+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 MAX77503 product line targets high-efficiency, space-constrained DC-DC conversion in battery-powered consumer and professional electronics - emphasizing ultra-low IQ, small WLP packaging, and integrated system-level features like POK and active discharge.
FAQ
What is the default output voltage of the MAX77503BEWC33+T?
The MAX77503BEWC33+T is factory-programmed for a fixed 3.3V output with ±1% accuracy over temperature and load. This eliminates external feedback resistors and simplifies layout. The device retains full I²C programmability (0.8V–5V in 50mV steps) if reconfiguration is needed later in the design cycle - but the default 3.3V setting remains active unless modified via register write.
Does the MAX77503BEWC33+T support hardware-only control without I²C?
Yes, the MAX77503BEWC33+T supports full hardware-only operation using the EN pin for enable/disable and the POK pin for power-good signaling. The BIASEN pin can remain unconnected or grounded, and SDA/SCL may be tied to PGND. All protection features - including UVLO, thermal shutdown, and cycle-by-cycle current limiting - remain fully active independent of I²C communication.
What is the purpose of the VL pin on the MAX77503BEWC33+T?
The VL pin on the MAX77503BEWC33+T is a dedicated 1.8V internal LDO output that powers the IC's control logic and I²C interface. It must be bypassed with a 2.2μF ceramic capacitor to AGND but must not be loaded externally. Connecting external circuitry to VL violates the absolute maximum ratings and risks latch-up or degraded regulation performance of the main buck output.
How does the active discharge function work on the MAX77503BEWC33+T?
The MAX77503BEWC33+T includes an integrated 100Ω active discharge resistor between OUT/FB and PGND, enabled automatically when the buck is disabled. This discharges the output capacitor rapidly - typically clearing 3.3V to <100mV in under 5ms - meeting fast-power-down requirements in imaging and medical devices. Discharge is disabled when ADEN = 0 in register control or when using external feedback configurations.
What package type and dimensions does the MAX77503BEWC33+T use?
The MAX77503BEWC33+T uses a 12-bump wafer-level package (WLP) with 0.4mm pitch, measuring 1.85mm × 1.4mm in footprint and 0.7mm maximum height. Its land pattern follows Maxim Application Note 1891, and the package code W121A1+3 indicates RoHS compliance. This ultra-compact form factor enables placement beneath connectors or in narrow board edges common in drones and handheld cameras.
MAX77503BEWC33+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
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 14V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.5A
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-WLP (1.85x1.4)
MAX77503BEWC33+T FAQ
1.How can I place an order for MAX77503BEWC33+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77503BEWC33+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 MAX77503BEWC33+T reliable?
The price and inventory of MAX77503BEWC33+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77503BEWC33+T is usually 5 days.
3.What payment methods are accepted for MAX77503BEWC33+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77503BEWC33+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77503BEWC33+T?
MAX77503BEWC33+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77503BEWC33+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 MAX77503BEWC33+T?
For technical support, including MAX77503BEWC33+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77503BEWC33+T requirements.
6.How does Aetrix verify that MAX77503BEWC33+T is sourced from the original manufacturer or authorized distributors?
All MAX77503BEWC33+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 MAX77503BEWC33+T meets industry standards.
7.What is the process for return or replacement of MAX77503BEWC33+T?
All MAX77503BEWC33+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX77503BEWC33+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 MAX77503BEWC33+T part is unused and in its original packaging.
Return procedure for MAX77503BEWC33+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX77503BEWC33+T Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
