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Analog Devices Inc./Maxim Integrated MAX77801EWP+T
- Part No.:
- MAX77801EWP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFBGA, WLBGA
- Datasheet:
-
MAX77801EWP+T.pdf
- Description:
- IC REG BUCK BOOST PROG 2A 20WLP
- Quantity:
- Payment:
- Shipping:
Inventory:2,316
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Product details
Overview
MAX77801EWP+T from Analog Devices is a synchronous buck-boost DC-DC converter in a 20-bump wafer-level package (2.13mm × 1.83mm), designed for single-cell Li-ion battery systems. It regulates output from 2.6V to 4.18V across 2.3V–5.5V input, delivers up to 2A in boost mode and 3A in buck mode, and features I²C-programmable DVS, 2.5MHz switching, and integrated H-bridge power switches - used in AR/VR headsets and mobile payment terminals.
For engineers reviewing the MAX77801EWP+T datasheet, MAX77801EWP+T pinout, MAX77801EWP+T application, or MAX77801EWP+T equivalent, key selection criteria include its WLP footprint, soft-start implementation via ILIM_LX reduction, 55µA quiescent current in SKIP mode, and dual-voltage DVS latching behavior confirmed for this exact variant.
Technical Context
The MAX77801EWP+T implements a fixed-frequency (2.5MHz) current-mode PWM control scheme with three-phase H-bridge operation (Φ1–Φ3), enabling seamless buck-to-boost transition without discontinuity. Its soft-start is implemented exclusively by reducing peak inductor current limit (ILIM_LX) for 120µs after enable assertion - a behavior explicitly specified for MAX77801EWP+T and MAX77801ETP+T in the datasheet.
It supports dynamic voltage scaling via dedicated DVS pin latching at startup, with programmable slew rates (12.5/25mV/µs ramp-up; 3.125/6.25mV/µs ramp-down) and factory-default VOUT_DVS_L = 3.3V / VOUT_DVS_H = 3.4V - values unique to the EWP variant per Electrical Characteristics table.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.3V to 5.5V - supports full Li-ion battery discharge curve including deep discharge down to 2.3V. |
| VOUT Range | 2.60V to 4.1875V in 12.5mV steps - enables precise rail matching for SoCs and PMICs requiring tight voltage margins. |
| Output Current | Up to 2A (boost), 3A (buck) - sufficient for high-pulse loads in handheld scanners and security cameras. |
| Switching Frequency | 2.25–2.75MHz (typ 2.5MHz) - allows use of compact 1µH inductors and reduces EMI fundamental frequency. |
| Quiescent Current | 55µA (typ) in SKIP mode - extends battery runtime during low-power standby in always-on AR/VR devices. |
| Thermal Shutdown | +165°C with 20°C hysteresis - protects silicon integrity under sustained high-current operation in thermally constrained WLP layouts. |
| I²C Interface | Up to 3.4MHz Fast Mode Plus - enables rapid DVS updates and fault register reads without CPU polling overhead. |
Pinout & Package
MAX77801EWP+T uses a 20-bump wafer-level package (WLP), 2.13mm × 1.83mm, 0.4mm pitch, bump-side-down mounting. Thermal resistance θJA = 55.49°C/W on 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input voltage supply | Battery or DC source input; requires 10µF ceramic bypass to PGND for stability and noise suppression. |
| OUT | Regulated output | Delivers configured VOUT; requires 47µF ceramic capacitor to PGND for ripple control and loop stability. |
| FB | Output voltage feedback | Sense node for regulation; connects directly to OUT via resistor divider for non-default VOUT configurations. |
| LX1 / LX2 | H-bridge switching nodes | Connect to opposite ends of single 1µH inductor; must be routed with minimal loop area to reduce EMI and switching losses. |
| PGND | Power ground return | High-current return path for LX1/LX2; must be solid copper plane connected to AGND at single point near IC. |
| AGND | Analog reference ground | Reference for FB, EN, DVS, SCL/SDA; tied to PGND on PCB per layout guidelines to avoid noise coupling. |
| EN | Enable control input | Active-high logic input with internal 800kΩ pulldown; asserts device enable only after tON_DLY = 100µs delay. |
| DVS | Dynamic voltage select | Latched at soft-start completion to choose between VOUT_DVS_L (3.3V) or VOUT_DVS_H (3.4V) registers. |
| SCL / SDA | I²C serial interface | Require external 1.5–2.2kΩ pullups to VIO; support 3.4MHz clock for fast register access and real-time DVS updates. |
| POK | Power-OK open-drain output | Asserts high-Z when VOUT ≥ 80% target; requires external 10–100kΩ pullup; signals system readiness to firmware. |
| VIO | I²C logic supply | Supplies I²C interface level (1.7–3.6V); bypassed with 0.1µF ceramic to AGND for noise immunity. |
| VSYS | System voltage monitor | Monitors battery voltage for UVLO (2.375–2.625V rising threshold); used for system brownout detection. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck-boost transition | Three-phase H-bridge topology eliminates output discontinuity during VIN crossing VOUT, critical for uninterrupted SoC operation. |
| ILIM_LX-based soft-start | Reduces peak inductor current limit to 1.8A for 120µs (MAX77801EWP+T specific), limiting inrush without requiring external timing components. |
| DVS latching at startup | DVS pin state is sampled and held after soft-start completes, enabling hardware-selectable dual-rail operation without I²C intervention. |
| SKIP mode efficiency | 55µA quiescent current at light load preserves battery life in intermittent-use devices like handheld scanners and security cameras. |
| Integrated protection suite | Includes overvoltage (120% default), overcurrent (4.7A typical ILIM), thermal shutdown (+165°C), and soft-start - reduces external component count. |
Applications
| AR/VR Headset Power Management | Mobile Payment Terminal Core Rail |
|---|---|
Use Scenario: Powers display driver, IMU, and wireless SoC in compact, thermally isolated headset enclosure with single Li-ion cell. IC Role / Device Role / Timing Role: Primary buck-boost regulator delivering stable 3.3V/3.4V rails; manages dynamic load transients during sensor fusion and Bluetooth bursts. Use Value: 97% peak efficiency and 55µA SKIP current extend usable runtime; WLP footprint saves PCB area for miniaturized optics module. | Use Scenario: Supplies processor, NFC controller, and secure element in portable card reader operating across full battery range (4.2V → 2.8V). IC Role / Device Role / Timing Role: System power regulator maintaining 3.3V output while seamlessly transitioning between buck and boost as battery discharges. Use Value: 2.5MHz switching enables small 1µH inductor; POK signal synchronizes firmware boot sequence with rail stabilization. |
| Handheld Industrial Scanner | Smart Security Camera Edge Node |
Use Scenario: Powers laser diode driver, image sensor, and MCU in ruggedized barcode scanner subjected to frequent start-stop cycles. IC Role / Device Role / Timing Role: High-current (3A buck) regulator supporting brief 2A laser pulses; DVS selects 3.3V for idle, 3.4V for active scanning. Use Value: Burst-mode ILIM_LX_HIGH extension prevents dropout during laser activation; 120µs soft-start ensures clean power-up without MCU reset. | Use Scenario: Provides main SoC rail in battery-backed indoor camera with motion-triggered video capture and Wi-Fi upload. IC Role / Device Role / Timing Role: Always-on buck-boost supplying 3.3V to application processor; monitors VSYS for battery health and initiates graceful shutdown below 2.5V. Use Value: 2.3V minimum VIN supports deep battery discharge; thermal shutdown protects silicon during extended encode sessions in enclosed housing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX77801ETP+T | Same electrical specs but 20-pin 4mm × 4mm TQFN package; identical ILIM_LX soft-start behavior; VOUT_DVS_H = 3.75V (not 3.4V) | TQFN offers easier rework and thermal relief via exposed pad; higher θJA (39°C/W) vs. WLP (55.49°C/W) | Select for prototyping or thermally demanding applications where PCB space permits larger footprint. |
| TPS63900DSKR | Lower IQ (75nA in shutdown), wider VOUT range (1.8–5.5V), but no DVS pin; 2.4MHz switching; 1.45mm × 0.95mm WLCSP | No hardware DVS latching; relies solely on I²C for voltage changes; lacks POK output and VSYS monitoring | Select when ultra-low shutdown current is critical and DVS hardware control is unnecessary. |
Compared with MAX77801ETP+T and TPS63900DSKR, the MAX77801EWP+T uniquely combines WLP miniaturization, hardware DVS latching, and factory-configured 3.3V/3.4V dual-rail support - making it optimal for space-constrained, battery-powered AR/VR and handheld devices requiring deterministic voltage selection at boot.
Availability
MAX77801EWP+T is available at Aetrix Electronics and suitable for AR/VR headsets, handheld industrial scanners, and smart security cameras requiring stable component supply across long production lifecycles and battery-performance-critical designs.
Supply support for MAX77801EWP+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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.
The MAX77801 belongs to Analog Devices' power management portfolio targeting ultra-compact, high-efficiency DC-DC conversion for Li-ion-powered portable electronics - emphasizing minimal footprint, dynamic voltage agility, and robust protection in constrained thermal environments.
FAQ
What is the soft-start behavior of the MAX77801EWP+T?
The MAX77801EWP+T implements soft-start exclusively by reducing the peak inductor current limit (ILIM_LX) to 1.8A for 120µs after EN assertion - a behavior explicitly documented for this variant. It does not ramp the internal reference voltage (VREF), unlike the HEWP variant. This method limits inrush current without requiring external components and ensures predictable startup timing for firmware synchronization.
What are the factory-default output voltages for MAX77801EWP+T?
The MAX77801EWP+T has factory-default VOUT_DVS_L = 3.3V and VOUT_DVS_H = 3.4V, as specified in the Buck-Boost Electrical Characteristics table. These values are programmed at wafer test and can be overwritten via I²C, but the hardware DVS pin selects between these two preloaded registers at startup - a feature distinguishing the EWP variant from other members of the MAX77801 family.
Does MAX77801EWP+T support both buck and boost modes simultaneously?
No - the MAX77801EWP+T operates in either buck mode (VIN > VOUT) or boost mode (VIN < VOUT) at any given time, but transitions seamlessly between them as input voltage crosses the regulated output. Its three-phase H-bridge topology enables continuous conduction without output interruption, maintaining regulation during battery discharge from 4.2V down to 2.3V while holding VOUT constant at 3.3V or 3.4V.
What is the maximum supported I²C clock frequency for MAX77801EWP+T?
The MAX77801EWP+T supports I²C clock frequencies up to 3.4MHz in Fast Mode Plus, as confirmed in the I²C Electrical Characteristics table. This enables sub-microsecond register writes and rapid DVS updates, critical for real-time power optimization in responsive applications like AR/VR headsets where display brightness or sensor sampling rate changes dynamically.
How does the POK output function on MAX77801EWP+T?
The POK output on MAX77801EWP+T is an open-drain signal that goes high-impedance when VOUT reaches ≥80% of the target voltage and pulls low when VOUT drops below 75% or when the device is disabled. It requires an external 10–100kΩ pullup resistor and provides firmware with deterministic power-good status - essential for safe boot sequencing in battery-powered devices using the MAX77801EWP+T.
MAX77801EWP+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WFBGA, WLBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.6V
- Voltage - Output (Max):
- 4.19V
- Current - Output:
- 2A
- Frequency - Switching:
- 2.5MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-WLP (1.83x2.13)
MAX77801EWP+T FAQ
1.How can I place an order for MAX77801EWP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77801EWP+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 MAX77801EWP+T reliable?
The price and inventory of MAX77801EWP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77801EWP+T is usually 5 days.
3.What payment methods are accepted for MAX77801EWP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77801EWP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77801EWP+T?
MAX77801EWP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77801EWP+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 MAX77801EWP+T?
For technical support, including MAX77801EWP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77801EWP+T requirements.
6.How does Aetrix verify that MAX77801EWP+T is sourced from the original manufacturer or authorized distributors?
All MAX77801EWP+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 MAX77801EWP+T meets industry standards.
7.What is the process for return or replacement of MAX77801EWP+T?
All MAX77801EWP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX77801EWP+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 MAX77801EWP+T part is unused and in its original packaging.
Return procedure for MAX77801EWP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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