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Analog Devices Inc./Maxim Integrated MAX77837EWA+T
- Part No.:
- MAX77837EWA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-WFBGA, WLBGA
- Datasheet:
-
MAX77837EWA+T.pdf
- Description:
- IC REG BUCK BOOST ADJ DL 8WLP
- Quantity:
- Payment:
- Shipping:
Inventory:555
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Product details
Overview
MAX77837EWA+T from Analog Devices is a nanoPower buck-boost DC-DC converter optimized for single-cell Li-ion/Li-Poly and alkaline battery systems in ultra-low-power wearable and IoT devices. It delivers dual programmable outputs (1.8V–5.2V), supports 0.4A/1.05A switch current limits, operates from 1.8V–5.5V input, and achieves 95% peak efficiency at 5.5VIN/3.8VOUT, enabling long standby time in asset trackers and LPWAN SoC companion power rails.
For engineers reviewing the MAX77837EWA+T datasheet, MAX77837EWA+T pinout, MAX77837EWA+T application, or MAX77837EWA+T equivalent, this page provides verified circuit role (dual-output buck-boost regulator), hardware-configurable DVS and protection modes, WLP/FC2QFN package options, and real-world design meaning of 430nA IQ, SEL1/SEL2 resistor programming, and hiccup/latch-off short-circuit response.
Technical Context
The MAX77837EWA+T implements adaptive on-time current-mode control with a three-phase H-bridge topology (Φ1: HS1+LS2, Φ2: HS1+HS2, Φ3: LS1+HS2) to support seamless buck, boost, and buck-boost operation across 1.8V–5.5V input and 1.8V–5.2V output ranges. Its dynamic voltage scaling (DVS) function enables in-system VOUT transitions between OUT1 and OUT2 without shutdown, controlled by SEL2 after soft-start completion.
It operates in Low-Power Mode (LPM), Skip Mode, or Continuous Conduction Mode (CCM) depending on load, with cycle-by-cycle overcurrent protection, thermal shutdown at 165°C, and input UVLO at 1.75V (60mV hysteresis). Soft-start enforces 2V/ms slew rate and 50% reduced switch current limit during ramp-up to prevent inrush.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion (2.7–4.2V), Li-Poly, or two alkaline (1.8–3.0V) without external LDO pre-regulation. |
| Output Voltage Range | 1.8V to 5.2V - dual outputs (OUT1/OUT2) set via RSEL1; enables rail splitting or dynamic supply scaling for MCU core/peripheral domains. |
| Quiescent Current | 430nA typical - enables >10-year battery life in always-on sensor nodes drawing <1µA average system current. |
| Switch Current Limit | 0.4A or 1.05A - selected via RSEL2; lower limit reduces external inductor/capacitor size for compact wearables; higher limit supports burst-mode RF transmission. |
| Peak Efficiency | 95% at 5.5VIN/3.8VOUT - minimizes thermal rise in sealed enclosures and extends runtime during active sensing cycles. |
| Shutdown Current | 10nA typical - ensures negligible drain during deep-sleep states, critical for multi-year deployment in remote asset trackers. |
| Protections | UVLO (1.75V), OCP, thermal shutdown (165°C), active discharge (100Ω) - eliminates need for external fault-handling circuitry in space-constrained designs. |
Pinout & Package
MAX77837EWA+T is available in an 8-bump wafer-level package (WLP), 1.84mm × 1.03mm × 0.4mm pitch, suitable for ultra-compact PCB layouts in wearables and coin-cell-powered sensors.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input Power Supply | Accepts 1.8V–5.5V battery or source; requires 10µF X7R 0603 ceramic bypass capacitor close to pin. |
| OUT | Regulated Output | Delivers dual-programmable VOUT (1.8V–5.2V); requires 22µF X7R 0805 ceramic output capacitor for stability. |
| EN | Active-High Enable | Logic-controlled startup; rising edge initiates 1.6ms delay then 2V/ms soft-start ramp; must be held high for normal operation. |
| LX1, LX2 | Switching Nodes | H-bridge high-side/low-side driver outputs; connect to single 2.2µH inductor; require low-ESR layout and Kelvin grounding. |
| GND | Power & Analog Ground | Common reference for all signals; must be solid copper pour tied to thermal pad for thermal performance and noise immunity. |
| SEL1 | Output Voltage Selector | Analog input; resistor-to-GND selects predefined OUT1/OUT2 pair per Table 1 (e.g., 7.15kΩ = 1.8V/3.3V). |
| SEL2 | Configuration & DVS Control | Analog input pre-soft-start; sets ILIM, DVS enable, startup rail, and protection mode; becomes logic input post-soft-start for DVS toggling. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Output Voltage Programming | RSEL1 selects two fixed VOUT levels (e.g., 1.8V/3.3V or 2.5V/4.5V), enabling flexible rail assignment for mixed-voltage SoCs without external DACs. |
| Dynamic Voltage Scaling (DVS) | Post-soft-start SEL2 logic control changes regulated output from OUT1 → OUT2 (ramped) or OUT2 → OUT1 (discharge-based), supporting CPU frequency scaling without reset. |
| Configurable Short-Circuit Response | RSEL2 selects hiccup mode (auto-retry) or latch-off mode (requires EN toggle), allowing trade-off between fault resilience and system safety in medical or industrial edge nodes. |
| Ultra-Low Quiescent Current | 430nA typical IQ enables >10-year battery life in devices with <1% duty cycle, such as monthly-reporting GPS asset trackers. |
| Three-Phase H-Bridge Topology | Enables seamless transition between buck, boost, and buck-boost operation near VIN ≈ VOUT, eliminating voltage gaps and improving regulation accuracy across full input range. |
Applications
| LPWAN SoC Companion Power | IoT Wearable Sensor Hub |
|---|---|
Use Scenario: Powers NB-IoT or LoRa transceivers paired with ultra-low-power MCUs in battery-operated smart meters and utility monitors. IC Role / Device Role / Timing Role: Dual-output buck-boost regulator providing independent 3.3V (radio) and 1.8V (MCU core) rails from a single 3.6V Li-SOCl₂ cell. Use Value: Eliminates discrete LDOs and enables DVS-driven radio transmit/receive voltage scaling, reducing average system current by 35% versus fixed-output solutions. |
Use Scenario: Powers optical heart-rate sensors, accelerometers, and BLE radios in wrist-worn health monitors with coin-cell or thin-film batteries. IC Role / Device Role / Timing Role: NanoPower regulator delivering 2.5V (sensor analog front-end) and 3.0V (BLE SoC) with 430nA IQ and 10nA shutdown current. Use Value: Extends battery life to 24+ months in continuous-sensing mode by minimizing quiescent loss and enabling precise rail sequencing via SEL1/SEL2 resistors. |
| Asset Tracking Device | Smart Door Lock Controller |
Use Scenario: Supplies GPS/GNSS receiver, cellular modem, and microcontroller in global logistics trackers operating for years on primary lithium batteries. IC Role / Device Role / Timing Role: Buck-boost converter with configurable 1.05A switch limit for burst-mode GNSS acquisition and 0.4A limit for low-power sleep states. Use Value: Reduces BOM count by integrating dual-rail generation and short-circuit protection, while RSEL2-configured hiccup mode prevents lockup during motor-driven actuator faults. |
Use Scenario: Powers fingerprint sensor, secure MCU, and solenoid driver in battery-powered smart locks requiring >5-year operational life and fail-safe behavior. IC Role / Device Role / Timing Role: Regulator with latch-off short-circuit protection and thermal shutdown, ensuring solenoid overcurrent events disable output until manual reset. Use Value: Guarantees safe power cutoff during tamper attempts or solenoid stall, meeting UL 294 and EN 13637 mechanical security requirements without external supervisors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63802DLAR | Higher IQ (1.3µA), fixed 3.3V/5.0V dual output, no DVS or SEL-pin configuration; 2.5mm × 2.5mm QFN-11 package. | Best for cost-sensitive designs where dual-rail flexibility is unnecessary and 3.3V/5.0V fixed outputs suffice. | Select TPS63802DLAR only if DVS, ultra-low IQ, or resistor-programmable VOUT are not required. |
| RTQ2134BGQW | Lower max IOUT (0.6A), 600nA IQ, no dual-output or DVS; supports 2.5V–5.5V input, 0.6V–5.2V output; 1.6mm × 1.6mm WLCSP-12. | Suitable for single-rail, space-constrained applications like hearing aids where dual outputs add complexity. | Choose RTQ2134BGQW when only one regulated rail is needed and footprint is more critical than configurability. |
Compared with TPS63802DLAR and RTQ2134BGQW, the MAX77837EWA+T uniquely combines sub-500nA IQ, dual programmable outputs, hardware-configurable DVS, and hiccup/latch-off selection-making it the only option for multi-year, multi-rail, field-upgradable IoT endpoints where firmware-driven voltage scaling and minimal standby drain are mandatory.
Availability
MAX77837EWA+T is available at Aetrix Electronics and suitable for LPWAN SoC companion power, IoT wearable sensor hubs, and asset tracking devices requiring stable component supply across multi-year production cycles and evolving battery chemistries.
Supply support for MAX77837EWA+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 technologies, serving industrial, automotive, communications, and healthcare markets with precision power, sensing, and conversion solutions.
The MAX77837EWA+T belongs to Analog Devices' nanoPower buck-boost regulator product line, designed specifically for battery-powered edge devices demanding multi-year operation, dual-rail flexibility, and hardware-based voltage scaling without MCU intervention.
FAQ
What is the exact package type and dimensions of the MAX77837EWA+T?
The MAX77837EWA+T uses an 8-bump wafer-level package (WLP) with dimensions 1.84mm × 1.03mm × 0.4mm pitch. This ultra-compact footprint is specified in Package Code W81E1+1 and Outline Number 21-100574, making it ideal for space-constrained wearables and coin-cell devices where board area is at a premium. The WLP variant is distinct from the FC2QFN option.
How does the Dynamic Voltage Scaling (DVS) function work in the MAX77837EWA+T?
In the MAX77837EWA+T, DVS allows real-time switching between two preconfigured output voltages (OUT1 and OUT2) without powering down the IC. After soft-start completes, the SEL2 pin becomes a logic input: pulling it high transitions VOUT from OUT1 to OUT2 with a 2V/ms ramp; pulling it low triggers discharge-based transition from OUT2 to OUT1. DVS is disabled if OUT2 is selected as the startup rail.
What are the confirmed switch current limit options for the MAX77837EWA+T and how are they selected?
The MAX77837EWA+T supports two switch current limits: 0.4A and 1.05A. These are selected exclusively via resistor RSEL2 connected between the SEL2 pin and GND, as defined in Table 2 of the datasheet. A value of 8.45kΩ configures 1.05A for high-current bursts (e.g., GNSS acquisition), while 30.1kΩ selects 0.4A to minimize inductor size and losses in low-duty-cycle sleep states.
Does the MAX77837EWA+T support both hiccup and latch-off short-circuit protection modes?
Yes, the MAX77837EWA+T supports both hiccup and latch-off short-circuit protection modes. The mode is selected by the resistor value on the SEL2 pin per Table 2: 8.45kΩ enables hiccup mode (auto-retry), while 15.0kΩ configures latch-off mode (output remains disabled until EN is toggled or supply is cycled). This hardware-selectable behavior eliminates need for external fault management logic.
What is the guaranteed shutdown current specification for the MAX77837EWA+T?
The MAX77837EWA+T has a guaranteed shutdown current of 10nA typical (100nA maximum) when the EN pin is driven low (VEN = 0V) at +25°C. This ultra-low leakage ensures negligible battery drain during extended storage or deep-sleep periods, directly enabling multi-year operation in sealed IoT deployments such as environmental sensors or smart meter backup systems.
MAX77837EWA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WFBGA, WLBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- 5.2V
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WLP (1.81x1)
MAX77837EWA+T FAQ
1.How can I place an order for MAX77837EWA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX77837EWA+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 MAX77837EWA+T reliable?
The price and inventory of MAX77837EWA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX77837EWA+T is usually 5 days.
3.What payment methods are accepted for MAX77837EWA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX77837EWA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX77837EWA+T?
MAX77837EWA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX77837EWA+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 MAX77837EWA+T?
For technical support, including MAX77837EWA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX77837EWA+T requirements.
6.How does Aetrix verify that MAX77837EWA+T is sourced from the original manufacturer or authorized distributors?
All MAX77837EWA+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 MAX77837EWA+T meets industry standards.
7.What is the process for return or replacement of MAX77837EWA+T?
All MAX77837EWA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX77837EWA+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 MAX77837EWA+T part is unused and in its original packaging.
Return procedure for MAX77837EWA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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