MAX8671X Datasheet, PDF (1/44 Pages) Maxim Integrated Products – PMIC with Integrated Charger and Smart Power Selector for Handheld Devices

19-0885; Rev 0; 8/07
EVAALVUAAILTAIOBNLEKIT
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
General Description
The MAX8671X integrated power-management IC
(PMIC) is ideal for use in portable media players and
other handheld devices. In addition to five regulated
output voltages, the MAX8671X integrates a 1-cell lithi-
um ion (Li+) or lithium polymer (Li-Poly) charger and
Smart Power Selector™ with dual (AC-to-DC adapter
and USB) power inputs*. The dual-input Smart Power
Selector supports end products with dual or single
power connectors. All power switches for charging and
switching the system load between battery and external
power are included on-chip. No external MOSFETs are
required.
Maxim’s Smart Power Selector makes the best use of
limited USB or AC-to-DC adapter power. Battery
charge current and input current limit are independent-
ly set. Input power not used by the system charges the
battery. Charge current and DC current limit are pro-
grammable up to 1A while USB input current can be set
to 100mA or 500mA. Automatic input selection switches
the system load from battery to external power. Other
features include overvoltage protection, charge status
and fault outputs, power-OK monitors, charge timer,
and battery thermistor monitor. In addition, on-chip
thermal limiting reduces battery charge rate to prevent
charger overheating.
The MAX8671X offers adjustable voltages for all out-
puts. Similar parts with factory-preset output voltages
are also available (contact factory for availability).
Applications
Portable Audio Players
GPS Portable Navigators
Features
o 16V-Tolerant USB and DC Inputs
o Automatically Powers from External Power or
Battery
o Operates with No Battery Present
o Single-Cell Li+/Li-Poly Charger
o Three 2MHz Step-Down Regulators
Up to 96% Efficiency
o Two Low I_Q Linear Regulators
o Output Power-Up Sequencing
o Thermal-Overload Protection
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
PKG
CODE
MAX8671XETL+ -40°C to +85°C ^{40 Thin QFN-EP*} T4055-1
5mm x 5mm
+Denotes a lead-free package.
*EP = Exposed paddle.
Simplified Applications Circuit
AC-TO-DC
DC
ADAPTER
MAX8671X
SYS
USB
ON
OFF
USB
EN
PWM
OUT1
+ _Li+/LiPo
BATTERY
OUT1
1V TO V_SYS
425mA
PEN1
PEN2
USUS
CEN
μP
OUT2
OUT3
OUT2
1V TO V_SYS
425mA
OUT3
1V TO V_SYS
425mA
*Protected by US Patent #6,507,172.
Smart Power Selector is a trademark of Maxim Integrated
Products, Inc.
CST1
CST2
DOK
UOK
OUT4
OUT5
OUT4
0.6V TO V_SYS
180mA
OUT5
0.6V TO V_SYS
180mA
________________________________________________________________ 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.