MAX8819A Datasheet, PDF (1/29 Pages) Maxim Integrated Products – PMIC with Integrated Chargers and Smart Power Selector in a 4mm x 4mm TQFN

19-4166; Rev 1; 4/09
EVAALVUAAILTAIOBNLEKIT
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) charg-
er, 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 independent-
ly 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.
Applications
MP3 Players
Portable GPS Devices
Low-Power Handheld Products
Cellular Telephones
Digital Cameras
Handheld Instrumentation
PDAs
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
SYS
VOLTAGE
(V)
MAX8819AETI+ -40°C to +85°C 28 TQFN-EP*
4.35
MAX8819BETI+ -40°C to +85°C 28 TQFN-EP*
5.3
MAX8819CETI+ -40°C to +85°C 28 TQFN-EP*
4.35
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Features
o Smart Power Selector
o Operates with No Battery Present
o USB/AC Adapter One-Cell Li+ Charger
o Three 2MHz Step-Down Converters
95% Peak Efficiency
100% Duty Cycle
±3% Output Accuracy over Load/Line/
Temperature
o 2 to 6 Series WLED Driver with Dimming Control
o Active-Low REG1 Reset Output
o Short-Circuit/Thermal-Overload/Input
Undervoltage/Overvoltage Protection
o Power-Up/Down Sequencing (MAX8819C)
o Total Solution Size: Less Than 90mm²
Typical Operating Circuit
USB/AC-TO-DC
ADAPTER
ENABLE SYSTEM
ENABLE CHARGER
ENABLE BACKLIGHT
SYS
DC
DLIM1
DLIM2
EN123
SYS
BAT
+ _Li+/Li-Poly
BATTERY
CEN
EN4
LX1
LX4 MAX8819_
OUT1
I/O
OVP4
LX2
OUT2
MEMORY
OUT3
LX3
CORE
CISET
FB4
CHG CHG
RST1 RST1
Smart Power Selector is a trademark of Maxim Integrated
Products, Inc.
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.