3-Output SIMO Buck-Boost Regulator with Power Sequencer and 3μA IQ

Always-On, Low power application mini PMIC. Single inductor with 3 buck-boost outputs

Please check latest availability status for a specific part variant.


The MAX77680/MAX77681 is a 3-channel single-inductor multiple-output (SIMO) buck-boost regulator that regulates three independent rails using only 3µA of quiescent current (IQ). The SIMO improves battery life by replacing inefficient LDOs while being competitive in efficiency to traditional single-output bucks.

The SIMO operates on a input supply between 2.7V and 5.5V. The outputs are independently programmable between 0.8V and 5.25V depending on ordering option. Each output is a buck-boost with glitchless transition between buck and boost operation. The SIMO can support >300mA loads (1.8VOUT, 3.7VIN).

The device integrates a flexible power sequencer (FPS) to control power-up/down order of each output. The default output voltages and sequence can be programmed at the factory. An I2C serial interface is used to further configure the device.

The MAX77680/MAX77681 is available in a 30-bump wafer-level package (WLP). Total solution size is only 15.5mm2. For a similar product with an LDO and battery charger, refer to the MAX77650 data sheet.

MAX77680, MAX77681: Simplified Application Circuit MAX77680, MAX77681: Simplified Application Circuit Enlarge+

Key Features

  • Single-Inductor, Multiple-Output (SIMO) Extends Battery Life
    • 300nA Shutdown Current
    • 3.0µA Operating Quiescent Current (3 SIMO Channels On)
    • Improves Overall System Efficiency while Reducing Size
    • Maintains Regulation without Dropout unlike Traditional Bucks
    • Glitchless Buck-Boost Operation
  • Compact, High-Efficiency Power Solution
    • Three Independent Channels from SIMO Regulator
    • 2.7V to 5.5V Input Voltage Range from Single Cell Li-Ion
    • 0.8V to 5.25V Output Voltage Range (Table 1)
    • Flexible Power Sequencing
    • On-Key Input for Hardware Enable
    • Reset Output
  • Small Size
    • 2.75mm x 2.15mm (0.7mm max height) WLP
    • 30-Bump, 0.4mm Pitch, 6 x 5 Array
    • 15.2mm2 Total Solution Size


  • Action Cameras, Wearable/Body Cameras
  • Hearables: Bluetooth Headphones and Earbuds
  • Low-Power Internet of Things (IoT) Gadgets
  • Wearables: Fitness, Health, and Activity Monitors

See parametric specs for Multifunction PMICs (81)

Part NumberPrimary TopologyMonitor/Control FeaturesDC-DC/Power FeaturesInterface TypeVIN
Oper. Freq.
minmaxminmaxSee Notes
MAX77680 Step-Up/Down
Reset Output
Current Limit
Internal Switch
Single Inductor Multiple Output
Soft Start
$1.61 @1k
MAX77681 2.45.25

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.

MAX77680EVKIT: Evaluation Kit for the MAX77680/MAX77681
MAX77681EVKIT: Evaluation Kit for the MAX77680/MAX77681
Request Reliability Report for: MAX77680 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

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.

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Related Resources

Wearable Power Management Solution

  • Extend Battery Use Time Between Battery Charging
  • Easy-to-Implement Li+ Battery Charging
  • Minimize Solution Footprint Through High Integration