MAX4880 Datasheet, PDF (1/10 Pages) Maxim Integrated Products – Overvoltage-Protection Controller with Internal Disconnect Switch

19-3776; Rev 0; 7/05
Overvoltage-Protection Controller with
Internal Disconnect Switch
General Description
The MAX4880 is an overvoltage-protection controller
with an internal current-limited switch that can be con-
figured as a low-cost battery charger. When the input
voltage exceeds the overvoltage trip level (5.7V), or
drops below the undervoltage-lockout level (4.2V), the
MAX4880 turns off the external n-channel MOSFET and
asserts an undervoltage/overvoltage flag indicator
(FLAGV) low to notify the processor.
The MAX4880 internal current-limited switch limits the
charge current flowing to the battery to 525mA. The
switch opens when the battery voltage reaches its full-
charged state (4.2V), and a flag (BAT_OK) asserts to
notify the processor. The MAX4880 includes a switch-
control input (CB) to turn off the internal current-limited
switch, regardless of the battery voltage.
The MAX4880 also features a built-in startup delay that
allows the adapter voltage to settle down before turning
on the MOSFET. Other features include 15kV ESD pro-
tection for the input and a shutdown function (EN) to
turn off the external n-channel MOSFET.
The MAX4880 is available in a space-saving 10-pin
TDFN package and is specified for operation over the
extended -40°C to +85°C temperature range.
Applications
Cell Phones
Digital Still Cameras
PDAs and Palmtop Devices
MP3 Players
TOP VIEW
Pin Configuration
10 9 8 7 6
MAX4880
12345
Features
♦ Overvoltage Protection Up to 28V
♦ Preset 5.6V Overvoltage Trip Level
♦ Internal 525mA Current-Limited Switch
♦ ±1.2% Accurate Battery Disconnect (4.2V)
♦ Drives Low-Cost n-Channel MOSFET
♦ Internal 50ms Startup Delay
♦ Overvoltage/Undervoltage-Fault FLAGV Indicator
♦ Battery-Voltage-Trip BAT_OK Indicator
♦ Undervoltage Lockout
♦ Thermal Shutdown Protection
♦ Tiny 10-Pin TDFN Package
Ordering Information
PART
TEMP RANGE
MAX4880ETB -40°C to +85°C
* EP = Exposed Pad
PIN-
PACKAGE
10 TDFN-EP*
TOP
MARK
APJ
Typical Operating Circuit
AC-DC
ADAPTER
5.25V
V_IO
IN
GATE BTA
BTB
MAX4880
FLAGV
BAT_OK
CB
EN
BTB_SNS
GND
DC-DC
CONVERTER
Li+
3mm x 3mm TDFN
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