My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX20345AEWN+T
- Part No.:
- MAX20345AEWN+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Power Management - Specialized
- Package:
- 56-WFBGA, WLBGA
- Datasheet:
-
MAX20345AEWN+T.pdf
- Description:
- WEARABLE PWR MNGMT SOLUTION LOW
- Quantity:
- Payment:
- Shipping:
Inventory:1,072
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX20345AEWN+T from Analog Devices is a highly integrated power management IC (PMIC) designed for ultra-low-power wearable systems. It integrates three PFM-controlled buck regulators (IQ = 0.9µA typ), three programmable LDOs (LDO1 IQ = 0.55µA, LDO2/LDO3 IQ = 1µA), one low-noise buck-boost regulator (IQ = 2µA), a linear Li-ion battery charger (5–500mA), and two load switches - all in a 56-bump WLP (3.37mm × 3.05mm). It enables 24/7 optical heart rate (OHR) and SpO₂ sensing with dynamic voltage scaling (DVS) and smart power selection.
For engineers reviewing the MAX20345AEWN+T datasheet, MAX20345AEWN+T pinout, MAX20345AEWN+T application, or MAX20345AEWN+T equivalent, key selection considerations include ultra-low quiescent current across all regulators, I²C-programmable output voltages (e.g., Buck1: 0.700–1.330V in 10mV steps), buck-boost noise optimization for analog sensing, and integrated thermistor-monitored charging with JEITA compliance.
Technical Context
The MAX20345AEWN+T implements a multi-rail, digitally configurable power architecture where each buck regulator uses pulse-frequency modulation (PFM) to maintain high efficiency at light loads (<100µA), and supports DVS via I²C, GPIO, or SPI. The buck-boost converter operates in buck-only or buck-boost mode, optimized for optical sensor biasing with minimized output noise and 2.6–5.5V programmable output.
Its power controller provides factory shipping mode, push-button monitoring, delayed reset signaling, and voltage sequencing control. The integrated monitor multiplexer with programmable divider enables real-time tracking of system voltages and charging current without external ADCs - critical for compact wearable BOMs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Buck Regulators (×3) | 0.9µA typical IQ; Buck1: 0.700–1.330V @10mV steps; enables precise core voltage tuning for low-power MCUs |
| LDO Regulators (×3) | LDO1 IQ = 0.55µA, 100mA; LDO2/LDO3 IQ = 1µA; supports rail isolation and peripheral power gating |
| Buck-Boost Regulator | 2µA IQ, 1.5W output, 2.6–5.5V in 50mV steps; ultra-low noise design minimizes interference in OHR/SpO₂ photodiode signals |
| Linear Charger | 5–500mA programmable charge current; +28V/−5.5V tolerant CHGIN; JEITA-compliant thermal regulation with thermistor input |
| Load Switches (×2) | RON = 1Ω at SYS = 3.0V; 0.65–5.5V input range; allows full peripheral disconnect to eliminate quiescent leakage |
| Package | 56-bump wafer-level package (WLP), 0.4mm pitch, 3.37mm × 3.05mm footprint - suitable for space-constrained wearables |
| Interface | I²C-compatible serial interface (7-bit slave address); supports register-level DVS, sequencing, and status monitoring |
Pinout & Package
The MAX20345AEWN+T is housed in a 56-bump, 0.4mm pitch, 3.37mm × 3.05mm wafer-level package (WLP), optimized for minimal PCB area in wearable form factors.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BK1OUT / BK2OUT / BK3OUT | Buck regulator outputs | Provide independently programmable, low-IQ DC rails for MCU cores, sensors, and RF subsystems |
| L1OUT / L2OUT / L3OUT | LDO outputs | Deliver ultra-low-noise, low-IQ bias for analog front-ends (e.g., ADC references, op-amps) |
| BBOUT | Buck-boost output | Supplies stable, low-noise voltage to optical emitters/detectors operating above/below battery voltage |
| SW1OUT / SW2OUT | Load switch outputs | Enable software-controlled power gating of non-critical peripherals (e.g., display backlight, BLE radio during sleep) |
| CHGIN / BAT / THM / VSYS | Charger interface | Supports dual-input power path (USB + battery), thermistor-based JEITA charging, and smart power selector arbitration |
| SCL / SDA / INT / RST | Digital control interface | Allow full configuration, fault reporting, and coordinated power sequencing via I²C |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low IQ regulation | 0.55–2µA typical quiescent current across all regulators - extends battery life in always-on wearables |
| Optical-sensing-optimized buck-boost | Minimized output noise and programmable DVS reduce signal corruption in PPG/SpO₂ measurements |
| Smart power selector | Automatically arbitrates between CHGIN and BAT inputs while maintaining seamless system operation during plug/unplug events |
| Programmable power-on/reset controller | Configurable reset delay, voltage sequencing order, and factory shipping mode simplify system boot reliability |
| Integrated monitor MUX | On-chip voltage/current monitoring with programmable divider eliminates need for external sense resistors and ADC channels |
Applications
| Optical Heart Rate Monitoring | Smartwatch Power Management |
|---|---|
Use Scenario: Continuous photoplethysmography (PPG) acquisition using green/red/IR LEDs and photodiodes. IC Role / Device Role / Timing Role: MAX20345AEWN+T supplies ultra-low-noise, DVS-capable bias to optical sensors and MCU, while managing battery charging and system sleep states. Use Value: Buck-boost output noise minimization directly improves PPG signal-to-noise ratio; ultra-low IQ extends runtime between charges. | Use Scenario: Multi-rail power delivery in compact wrist-worn devices with MCU, display, BLE, and environmental sensors. IC Role / Device Role / Timing Role: MAX20345AEWN+T acts as central PMIC, delivering seven independent regulated rails and enabling intelligent power gating via load switches. Use Value: Integrated LDOs and bucks reduce external component count; I²C programmability simplifies firmware-driven power state transitions. |
| Portable Medical Sensors | Low-Power IoT Wearables |
Use Scenario: Clinical-grade SpO₂ monitors requiring accurate analog measurement under varying battery conditions. IC Role / Device Role / Timing Role: MAX20345AEWN+T provides stable, low-noise bias for analog front-end and ADC, with JEITA-compliant charging and thermistor monitoring. Use Value: Thermistor-integrated charging ensures safe battery operation across temperature extremes; buck-boost maintains constant LED drive voltage despite battery sag. | Use Scenario: Battery-powered fitness trackers with motion sensing, Bluetooth LE, and ambient light detection. IC Role / Device Role / Timing Role: MAX20345AEWN+T manages energy budget across active/sleep modes, dynamically scaling voltages and disabling unused rails via I²C commands. Use Value: DVS and load switch control reduce average system power by >40% during sensor polling intervals; ultra-low IQ preserves battery during extended idle periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20347AEWN+T | Same family; adds integrated fuel gauge and enhanced safety features (OV/OC/OT protection), higher cost, identical pinout and footprint | Better suited for designs requiring battery state-of-charge reporting and tighter safety compliance | Select MAX20347AEWN+T if fuel gauging or additional fault protection is required; otherwise MAX20345AEWN+T offers optimal cost/power balance |
| TPS65218D0RSLR | TI PMIC with 4 buck + 4 LDO + charger; higher IQ (5–10µA), no buck-boost, larger QFN-48 package (5mm × 5mm) | Targeted at industrial/portable HMI; lacks optical-sensing noise optimization and DVS flexibility | Choose TPS65218D0RSLR only when legacy TI ecosystem integration or higher current capability (>500mA) is prioritized over ultra-low IQ and optical performance |
Compared with MAX20347AEWN+T and TPS65218D0RSLR, the MAX20345AEWN+T uniquely balances ultra-low quiescent current (sub-1µA bucks), buck-boost noise performance for analog sensing, and compact WLP packaging - making it the most targeted solution for next-generation optical wearables.
Availability
MAX20345AEWN+T is available at Aetrix Electronics and suitable for wearable devices, portable medical sensors, and low-power IoT wearables requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for MAX20345AEWN+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, headquartered in Wilmington, MA.
The MAX20345AEWN+T belongs to Analog Devices' ultra-low-power wearable PMIC product line, engineered specifically to extend battery life and enable continuous optical biosensing in space-constrained, always-on consumer health devices.
FAQ
What is the primary application focus of the MAX20345AEWN+T?
The MAX20345AEWN+T is purpose-built for ultra-low-power wearable electronics, especially those requiring continuous optical sensing such as heart rate (OHR) and blood oxygen (SpO₂) monitoring. Its buck-boost regulator is specifically optimized for low-noise operation in photodiode and LED biasing circuits, and its sub-1µA quiescent current across multiple rails enables multi-day battery life in compact form factors - a key requirement validated in reference designs like the sports watch with heart rate monitoring.
Does the MAX20345AEWN+T support dynamic voltage scaling (DVS), and how is it implemented?
Yes, the MAX20345AEWN+T supports DVS on all three buck regulators and the buck-boost regulator. DVS can be controlled via I²C (DVS Mode 0), GPIO (DVS Mode 1), or SPI (DVS Mode 2), allowing firmware to adjust output voltages in real time based on processor load or sensor activity. For example, Buck1 voltage can be scaled from 0.700V to 1.330V in 10mV steps - directly reducing dynamic power consumption in companion MCUs without hardware changes. This capability is explicitly documented in registers Buck1DVSCfg0–Buck1DVSSPI (0x1A–0x1E).
What battery charging features does the MAX20345AEWN+T include?
The MAX20345AEWN+T integrates a linear Li-ion battery charger with 5mA–500mA programmable charge current, +28V/−5.5V input tolerance, thermistor-based JEITA-compliant thermal regulation, step charging, and adaptive battery charging algorithms. It also features a smart power selector that automatically manages power path between CHGIN and BAT, ensuring uninterrupted system operation during USB connection/disconnection - all confirmed in the "Li+ Battery Charger with Smart Power Selector" functional block and ChgCntl0/ChgCntl1 register descriptions.
How does the MAX20345AEWN+T minimize noise in optical sensing applications?
The MAX20345AEWN+T minimizes noise in optical sensing through dedicated buck-boost regulator design: low-noise architecture, optimized switching phases, and output filtering (8.8µF capacitor specified), resulting in minimal ripple on BBOUT. This is explicitly called out in the General Description ("output noise of the Buck-Boost is minimized to provide the least impact possible on sensitive measurements") and reinforced in the Typical Operating Characteristics plots (Figures 32–35). The device's ability to power optical emitters/detectors with stable, clean voltage - even as battery voltage sags - directly improves PPG signal fidelity.
Is the MAX20345AEWN+T pin-compatible with other devices in the MAX2034x family?
Yes, the MAX20345AEWN+T shares identical pinout, package dimensions, and footprint with the MAX20347AEWN+T and MAX20348AEWN+T variants - confirmed in the "Package Information" section and Pin Configuration diagram (page 34). This enables direct hardware reuse across designs requiring incremental feature upgrades (e.g., adding fuel gauging or enhanced safety), provided firmware and register initialization are updated accordingly. No PCB redesign is needed when migrating within this family.
MAX20345AEWN+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 56-WFBGA, WLBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Battery Management
- Current - Supply:
- 720µA
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-WLP (3.37x3.05)
MAX20345AEWN+T FAQ
1.How can I place an order for MAX20345AEWN+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20345AEWN+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 MAX20345AEWN+T reliable?
The price and inventory of MAX20345AEWN+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20345AEWN+T is usually 5 days.
3.What payment methods are accepted for MAX20345AEWN+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20345AEWN+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20345AEWN+T?
MAX20345AEWN+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20345AEWN+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 MAX20345AEWN+T?
For technical support, including MAX20345AEWN+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20345AEWN+T requirements.
6.How does Aetrix verify that MAX20345AEWN+T is sourced from the original manufacturer or authorized distributors?
All MAX20345AEWN+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 MAX20345AEWN+T meets industry standards.
7.What is the process for return or replacement of MAX20345AEWN+T?
All MAX20345AEWN+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20345AEWN+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 MAX20345AEWN+T part is unused and in its original packaging.
Return procedure for MAX20345AEWN+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX20345AEWN+T Tags
-
TPS2511DGNR
Texas Instruments
-
UTC2000/MG
Microchip Technology
-
TUSB320HAIRWBR
Texas Instruments
-
TPS61252DSGR
Texas Instruments
-
PI5USB30216CXUAEX
Diodes Incorporated
-
SN6501DBVR
Texas Instruments
-
CYPD3177-24LQXQT
Infineon Technologies
-
SN6501QDBVRQ1
Texas Instruments
-
STUSB1600AQTR
STMicroelectronics
-
SN6505BDBVR
Texas Instruments
-
SN6501DBVT
Texas Instruments
-
TPS65150PWPR
Texas Instruments
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…
