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PMIC with Integrated Charger and Smart Power Selector™ in a 4mm x 4mm TQFN

A Complete Power Solution for Handheld Applications Includes a Battery Charger, Three Step-Down Converters, and WLED Power

Product Details

Key Features

Parametric specs for LED Drivers
VIN (V) (min) 2.6
VIN (V) (max) 5.5
Max. No. of LEDs 6
# LED Channels 1
Regulation Topology Inductor Based
Battery Input 1-Cell Li+
LED Configuration Series
ILED per Channel (A) (max) 0.03
Dimming Ratio (max) 32
Dimming Control Serial Pulse
VCURR_SENSE (mV) 500
POUT (W) 0.75
ICC (mA) (max) 0.95
LED String Volt. (V) (max) 24
Switching Frequency (kHz) 1000
2000
Package/Pins TQFN/28
Budgetary
Price (See Notes)
4.81
Parametric specs for Multifunction PMICs
VIN (V) (min) 4.1
VIN (V) (max) 5.5
# Step-Down Outputs 3
# Step-Up Outputs 1
Battery Charger Features Battery Charger
Charge Timer
Input Current Limit
Smart Pwr. Selector
Thermal Die Regulation
Thermistor Input
USB Input
VOUT (V) (min) 1
VOUT (V) (max) 24
Package/Pins TQFN/28
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Simplified Block Diagram

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Parameters

Parametric specs for LED Drivers
VIN (V) (min) 2.6
VIN (V) (max) 5.5
Max. No. of LEDs 6
# LED Channels 1
Regulation Topology Inductor Based
Battery Input 1-Cell Li+
LED Configuration Series
ILED per Channel (A) (max) 0.03
Dimming Ratio (max) 32
Dimming Control Serial Pulse
VCURR_SENSE (mV) 500
POUT (W) 0.75
ICC (mA) (max) 0.95
LED String Volt. (V) (max) 24
Switching Frequency (kHz) 1000
2000
Package/Pins TQFN/28
Budgetary
Price (See Notes)
4.81
Parametric specs for Multifunction PMICs
VIN (V) (min) 4.1
VIN (V) (max) 5.5
# Step-Down Outputs 3
# Step-Up Outputs 1
Battery Charger Features Battery Charger
Charge Timer
Input Current Limit
Smart Pwr. Selector
Thermal Die Regulation
Thermistor Input
USB Input
VOUT (V) (min) 1
VOUT (V) (max) 24
Package/Pins TQFN/28

Key Features

  • Smart Power Selector
  • Operates with No Battery Present
  • USB/AC Adapter One-Cell Li+ Charger
  • Three 2MHz Step-Down Converters
    • 95% Peak Efficiency
    • 100% Duty Cycle
    • ±3% Output Accuracy over Load/Line/Temperature
  • 2 to 6 Series WLED Driver with Dimming Control
  • Active-Low REG1 Reset Output
  • Short-Circuit/Thermal-Overload/Input Undervoltage/Overvoltage Protection
  • Power-Up/Down Sequencing (MAX8819C)
  • Total Solution Size: Less Than 90mm²

Applications/Uses

  • Cellular Telephones
  • Digital Cameras
  • Handheld Instrumentation
  • Low-Power Handheld Products
  • MP3 Players
  • PDAs
  • Portable GPS Devices

Description

The MAX8819_ is a complete power solution for MP3 players and other handheld applications. The IC includes a battery charger, step-down converters, and WLED power. It features an input current-limit switch to power the IC from an AC-to-DC adapter or USB port, a 1-cell lithium ion (Li+) or lithium polymer (Li-Poly) charger, three step-down converters, and a step-up converter with serial step dimming for powering two to six white LEDs. All power switches for charging and switching the system load between battery and external power are included on-chip. No external MOSFETs are required. The MAX8819C offers a sequenced power-up/power-down of OUT1, OUT2, and then OUT3.

Maxim's Smart Power Selector makes the best use of AC-to-DC adapter power or limited USB power. Battery charge current and input current limit are independently set. Input power not used by the system charges the battery. Charge current is resistor programmable and the input current limit can be selected as 100mA, 500mA, or 1A. Automatic input selection switches the system load from battery to external power. In addition, on-chip thermal limiting reduces the battery charge rate to prevent charger overheating.

Simplified Block Diagram

MAX8819A, MAX8819B, MAX8819C, MAX8819D: Typical Operating Circuit  Complete Power Solution for Handheld Applications Includes a Battery Charger, Three Step-Down Converters, and WLED Power | Typical Operating 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 .