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MAX8903AETI

Description
2A 1-Cell Li DC-DC Chargers for USB and Adapter Power Thermistor Monitor
File Size1MB,30 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
Download Datasheet View All

MAX8903AETI Overview

2A 1-Cell Li DC-DC Chargers for USB and Adapter Power Thermistor Monitor

19-4410; Rev 4; 5/11
KIT
ATION
EVALU
E
BL
AVAILA
2A 1-Cell Li+ DC-DC Chargers for USB
and Adapter Power
General Description
The MAX8903A–MAX8903E/MAX8903G/MAX8903H/
MAX8903J/MAX8903Y are integrated 1-cell Li+ charg-
ers and Smart Power Selectors™ with dual (AC adapter
and USB) power inputs. The switch mode charger uses
a high switching frequency to eliminate heat and allow
tiny external components. It can operate with either
separate inputs for USB and AC adapter power, or from
a single input that accepts both. All power switches for
charging and switching the load between battery and
external power are included on-chip. No external
MOSFETs, blocking diodes, or current-sense resistors
are required.
The MAX8903_ features optimized smart power control
to make the best use of limited USB or adapter power.
Battery charge current and SYS output current limit are
independently set. Power not used by the system
charges the battery. Charge current and SYS output cur-
rent limit can be set up to 2A while USB input current can
be set to 100mA or 500mA. Automatic input selection
switches the system from battery to external power. The
DC input operates from 4.15V to 16V with up to 20V pro-
tection, while the USB input has a range of 4.1V to 6.3V
with up to 8V protection.
The MAX8903_ internally blocks current from the bat-
tery and system back to the DC and USB inputs when
no input supply is present. Other features include pre-
qual charging and timer, fast charge timer, overvoltage
protection, charge status and fault outputs, power-OK
monitors, and a battery thermistor monitor. In addition,
on-chip thermal limiting reduces battery charge rate
and AC adapter current to prevent charger overheat-
ing. The MAX8903_ is available in a 4mm x 4mm, 28-pin
thin QFN package.
The various versions of the MAX8903_ allow for design
flexibility to choose key parameters such as system
regulation voltage, battery prequalification threshold,
and battery regulation voltage. The MAX8903B/
MAX8903E/MAX8903G also includes power-enable on
battery detection. See the
Selector Guide
section for
complete details.
o
o
o
o
Features
Efficient DC-DC Converter Eliminates Heat
4MHz Switching for Tiny External Components
Instant On—Works with No/Low Battery
Dual Current-Limiting Inputs—AC Adapter or USB
Automatic Adapter/USB/Battery Switchover to
Support Load Transients
50mΩ System-to-Battery Switch
Supports USB Spec
Thermistor Monitor
Integrated Current-Sense Resistor
No External MOSFETs or Diodes
4.1V to 16V Input Operating Voltage Range
MAX8903A–E/G/H/J/Y
o
o
o
o
Ordering Information
PART
MAX8903AETI+T
MAX8903BETI+T
MAX8903CETI+T
MAX8903DETI+T
MAX8903EETI+T
MAX8903GETI+T
MAX8903HETI+T
MAX8903JETI+T**
MAX8903YETI+T
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 Thin QFN-EP*
28 Thin QFN-EP*
28 Thin QFN-EP*
28 Thin QFN-EP*
28 Thin QFN-EP*
28 Thin QFN-EP*
28 Thin QFN-EP*
28 Thin QFN-EP*
28 Thin QFN-EP*
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed pad.
**Future
product—contact factory for availability.
T = Tape and reel.
Typical Operating Circuit
AC
ADAPTER
OR USB
LX
DC
CS
SYS
LOAD
CURRENT
CHARGE
AND
SYS LOAD
SWITCH
SYSTEM
LOAD
Applications
PDAs, Palmtops, and
Wireless Handhelds
Personal Navigation
Devices
Smart Cell Phones
Portable Multimedia
Players
Mobile Internet Devices
Ultra Mobile PCs
PWM
STEP-DOWN
USB
CHARGE
CURRENT
USB
BAT
BATTERY
Selector Guide appears at end of data sheet.
Smart Power Selector is a trademark of Maxim Integrated
Products, Inc.
MAX8903_
GND
Pin Configuration appears at end of data sheet.
1
________________________________________________________________
Maxim Integrated Products
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.
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