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Ultra-Low Power Tiny PMIC with Power Path Charger for Small Li+ and 150mA LDO

Highly-Integrated Power Solution with Safe Charging and Low-Noise LDO for Hearables and IoT

Product Details

Key Features

Applications/Uses

Parametric specs for Battery Chargers
Charging VIN (V) (max) 7
Max. ICHG (A) 0.475
Cell Chemistry Li-Ion
Li-Polymer
# Lithium Ion Cells 1
Protected VIN (V) (max) 7
Charger (V) 3.55 to 4.4
Oper. Temp. (°C) -40 to +85
Package/Pins THIN WLP/20
Budgetary
Price (See Notes)
1.58
Parametric specs for Multifunction PMICs
VIN (V) (min) 2.7
VIN (V) (max) 5.5
# Step-Down Outputs 3
# LDO Outputs 1
Battery Charger Features Battery Charger
Thermal Die Regulation
Package/Pins THIN WLP/20
Budgetary
Price (See Notes)
1.58
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Simplified Block Diagram

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Parameters

Parametric specs for Battery Chargers
Charging VIN (V) (max) 7
Max. ICHG (A) 0.475
Cell Chemistry Li-Ion
Li-Polymer
# Lithium Ion Cells 1
Protected VIN (V) (max) 7
Charger (V) 3.55 to 4.4
Oper. Temp. (°C) -40 to +85
Package/Pins THIN WLP/20
Budgetary
Price (See Notes)
1.58
Parametric specs for Multifunction PMICs
VIN (V) (min) 2.7
VIN (V) (max) 5.5
# Step-Down Outputs 3
# LDO Outputs 1
Battery Charger Features Battery Charger
Thermal Die Regulation
Package/Pins THIN WLP/20
Budgetary
Price (See Notes)
1.58

Key Features

  • Extends Battery Life
    • 200nA Factory-Ship Mode for Long Shelf Life
    • 500nA Shutdown Current
    • 4.5µA Quiescent Current with LDO Enabled
    • Charger Allows Battery to Relax after Charging
  • Linear Charger Optimized for Small Battery Size
    • 7.5mA to 300mA Fast-Charge Current
    • Battery Regulation Voltage from 3.6V to 4.6V
    • Accurate Termination Current as low as 0.375mA
    • Instant-On Functionality provided by Maxim's Smart Power Selector™
    • JEITA Battery Temperature Monitors for Safe Charging
  • Highly Integrated
    • 150mA LDO with Power-OK Output
    • Dual-Channel Current Sink for LEDs
    • Analog Multiplexer for Power Monitoring
    • Watchdog Timer
    • On-Key Input for LDO Enable and Manual Reset
  • Small Size
    • 2.23mm x 1.97mm (0.5mm max height) WLP
    • 20-Bump, 0.4mm Pitch, 4 x 5 Array

Applications/Uses

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

Description

The MAX77734 is a tiny PMIC for applications where size and simplicity are critical. The IC integrates a linear-mode Li+ battery charger, low-dropout linear regulator (LDO), analog multiplexer, and dual-channel current sink driver.

The charger is designed for small-battery systems that require accurate termination as low as 0.375mA. The circuit can instantly regulate the system voltage when an input source is connected even if the battery is depleted.

The 150mA LDO's output is programmable between 0.8V and 3.975V with I²C. The analog MUX enables an external ADC to perform conversions on battery V&I signals for power monitoring. The current sinks are capable of sinking 12.8mA each and can be programmed for LEDs to blink in custom patterns.

The MAX77734 is available in a 20-bump, 0.4mm pitch wafer-level package (WLP). For a similar product with additional regulators, see the MAX77650.

Design Solution: Can You Hear Me Now? Extend the Life of Your Hearable Device ›

Simplified Block Diagram

MAX77734: Simplified Application Circuit MAX77734: Simplified Application Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .