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MAX8819B

Maxim Integrated Products
Part Number MAX8819B
Manufacturer Maxim Integrated Products
Description PMIC
Published Jun 28, 2009
Detailed Description 19-4166; Rev 1; 4/09 KIT www.DataSheet4U.com ATION EVALU E L B A AVAIL PMIC with Integrated Chargers and Smart Power S...
Datasheet PDF File MAX8819B PDF File

MAX8819B
MAX8819B

Overview
19-4166; Rev 1; 4/09 KIT www.
DataSheet4U.
com ATION EVALU E L B A AVAIL PMIC with Integrated Chargers and Smart Power Selector in a 4mm x 4mm TQFN General 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/powerdown 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.
o o o o 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 MAX8819A/MAX8819B/MAX8819C o o o o o Typical Operating Circuit USB/AC-TO-DC ADAPTER DC DLIM1 DLIM2 BAT + ENABLE SYSTEM ENABLE CHARGER ENABLE BACKLIGHT SYS EN123 CEN EN4 LX4 OVP4 LX2 LX1 OUT1 I/O ...


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