MAX20335

Wearable Charge-Management Solution

Optimized Power Management for 24/7 Monitoring Systems Such as Wearables and IoT


Please check latest availability status for a specific part variant.

Description

The MAX20335 is a battery-charge-management solution ideal for low-power wearable applications. The device includes a linear battery charger with a smart power selector and several power-optimized peripherals. The MAX20335 features two ultra-low quiescent current buck regulators and three ultra-low quiescent current low-dropout (LDO) linear regulators, providing up to five regulated voltages, each with an ultra-low quiescent current, allows designers to minimize power consumption and extend battery life in 24/7 operation devices, such as those in the wearable market.

The battery charger features a smart power selector that allows operation on a dead battery when connected to a power source. To avoid overloading a power adapter, the input current to the smart power selector is limited based on an I2C register setting. If the charger power source is unable to supply the entire system load, the smart power control circuit supplements the system load with current from the battery. The charger also supports temperature dependent charge currents.

The two synchronous, high-efficiency step-down buck regulators feature a variable frequency mode for increased efficiency during light-load operation. The output voltage of these regulators can be programmed through I2C with the default preconfigured. The buck regulators can support dynamic voltage scaling to further improve system power consumption.

The three configurable LDOs each have a dedicated input pin. Each LDO regulator output voltage can be programmed through I2C with the default preconfigured. The linear regulators can also be configured to operate as power switches that may be used to disconnect the quiescent load of the system peripherals.

The MAX20335 features a programmable power controller that allows the device to be configured for applications that require the device be in a true-off, or always-on, state. The controller also provides a delayed reset signal and voltage sequencing.

The MAX20335 is available in a 36-bump, 0.4mm pitch, 2.72mm x 2.47mm wafer-level package (WLP).

MAX20335: Simplified Block Diagram MAX20335: Simplified Block Diagram Enlarge+

Key Features

  • Extend System Use Time Between Battery Charging
    • Dual Ultra-Low-IQ 200mA Buck Regulators
      • Output Programmable from 0.7V to 2.275V and 0.7V to 3.85V
      • 0.9µA (typ) Quiescent Current (Buck 1)
      • Optional Fixed Peak-Current Mode to Optimize Ripple Frequency in Noise-Sensitive Applications
    • Three Ultra-Low-IQ 100mA LDOs
    • LDO1
      • Output Programmable from 0.8V to 3.6V
      • 0.6µA (typ) Quiescent Current
      • 2.7V to 5.5V Input with Dedicated Pin
    • LDO2/3
      • Output Programmable from 0.9V to 4V
      • 1µA (typ) Quiescent Current
      • 1.71V to 5.5V Input with Dedicated Pin
  • Easy-to-Implement Li+ Battery Charging
    • Smart Power Selector
    • 28V/-5.5V Tolerant Input
    • Thermistor Monitor
  • Minimize Solution Footprint Through High Integration
    • Provides Five Regulated Voltage Rails
    • Switch Mode Option on Each LDO
  • Optimize System Control
    • Monitors Pushbutton for Ultra-Low Power Mode
    • Power-On Reset Delay and Voltage Sequencing
    • On-Chip Voltage Monitor Multiplexer

Applications/Uses

  • Fitness Monitors
  • Rechargeable IoT devices
  • Wearable Electronics
Part NumberPrimary TopologyMonitor/Control FeaturesDC-DC/Power FeaturesBattery Charger FeaturesInterface TypeVIN
(V)
VIN
(V)
VOUT
(V)
VOUT
(V)
Max. IOUT
(A)
Max. IOUT
(A)
Oper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX20335 Step-Down
Reset Output
Serial Interface
Shutdown
Current Limit
Fixed Freq./PWM
Internal Switch
Soft Start
Sync. Rectifier
Battery Charger
Charge Timer
Input Current Limit
Smart Pwr. Selector
Thermal Die Regulation
Thermistor Input
GPIO
I2C
2.7280.83.60.20.22000
WLP/36
$3.27 @1k
See All Multifunction PMICs (79)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX20335EVKIT: Evaluation Kit for the MAX20335

Quality and Environmental Data

Request Reliability Report for: MAX20335 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX20335AEWX+
  • MAX20335AEWX+T
  • MAX20335BEWX+
  • MAX20335BEWX+T
  • MAX20335CEWX+
  • MAX20335CEWX+T
  • MAX20335DEWX+
  • MAX20335DEWX+T
  • MAX20335EWX+
  • MAX20335EWX+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >

     
    Status:
    Package:
    Temperature:

    Related Resources


    MAX17312
    1-Cell ModelGauge m5 EZ Fuel Gauge with Protector and SHA-256 Authentication

    • Battery Health + Programmable Safety/Protection
    • Nonvolatile Memory for Stand-Alone Operation
    • Low Quiescent Current

    MAX17311
    1-Cell ModelGauge m5 EZ Fuel Gauge with Protector and SHA-256 Authentication

    • Battery Health + Programmable Safety/Protection
    • Nonvolatile Memory for Stand-Alone Operation
    • Low Quiescent Current

    MAX17313
    1-Cell ModelGauge m5 EZ Fuel Gauge with Protector and SHA-256 Authentication

    • Battery Health + Programmable Safety/Protection
    • Nonvolatile Memory for Stand-Alone Operation
    • Low Quiescent Current

    MAX17301
    1-Cell ModelGauge m5 EZ Fuel Gauge with Protector and SHA-256 Authentication

    • Battery Health + Programmable Safety/Protection
    • Nonvolatile Memory for Stand-Alone Operation
    • Low Quiescent Current

    MAX17302
    1-Cell ModelGauge m5 EZ Fuel Gauge with Protector and SHA-256 Authentication

    • Battery Health + Programmable Safety/Protection
    • Nonvolatile Memory for Stand-Alone Operation
    • Low Quiescent Current

    MAX17303
    1-Cell ModelGauge m5 EZ Fuel Gauge with Protector and SHA-256 Authentication

    • Battery Health + Programmable Safety/Protection
    • Nonvolatile Memory for Stand-Alone Operation
    • Low Quiescent Current

    MAX17823H
    12-Channel, High-Voltage Sensor with Integrated 650mA Cell Balancing and Differential UART for Daisy-Chain Communication

    • AECQ-100 Grade 2 Temperature Range
    • Operating Voltage from 9V to 65V
    • Ultra-Low Power Operation

    MAX17853
    14-Channel High-Voltage Data-Acquisition System

    • 65V Operating Voltage
    • Ultra-Low-Power Operation
    • Redundant ADC and Comparator (COMP) Acquisitions

    MAX77860
    USB Type-C, 3A Switch-Mode Buck Charger with Integrated CC Detection, Reverse Boost, and ADC

    • Single-Input Switch Mode Charger
    • USB Type-C Detection
    • One Safeout LDO
    • I2C-Compatible Interface