MAX4881 Datasheet, PDF (1/13 Pages) Maxim Integrated Products – Overvoltage Protection Controllers with Current Limit in TDFN

19-3777; Rev 2; 10/06
Overvoltage Protection Controllers with
Current Limit in TDFN
General Description
The MAX4881–MAX4884/MAX4893B overvoltage pro-
tection (OVP) controllers with built-in current-limited
switch, protect low-voltage systems against voltages of
up to 28V. When the input voltage exceeds the overvolt-
age trip level of 5.6V (MAX4881/MAX4883/MAX4893B) or
4.5V (MAX4882/MAX4884), the external n-channel MOS-
FET is turned off to prevent damage to the protected
components. An undervoltage/overvoltage flag indicator
(OV) notifies the processor that an undervoltage/overvolt-
age fault condition is present.
The MAX4881/MAX4882 feature an internal 1.1A
current-limited switch, while the MAX4883B/MAX4883C/
MAX4884B/MAX4884C include an internal 0.7A current-
limited switch. The MAX4893B includes a 0.9A current-
limited switch. When the load current is at the current
limit for longer than the blanking time, the switch of the
MAX4881/MAX4882/MAX4883B/MAX4884B/
MAX4893B latches off and does not turn back on until
EN, CB, or IN is cycled. A current-limit flag (FLAGI)
asserts to indicate a current fault condition.
The MAX4883C/MAX4884C limit the current to 0.7A
indefinitely until the thermal protection trips. An overcur-
rent flag output asserts to indicate a current fault condi-
tion after the blanking time has elapsed.
The MAX4881–MAX4884/MAX4893B have a control
input (CB) that is used to turn on and off the internal cur-
rent-limited switch. Other features include a shutdown
function (EN) to disable the external n-channel MOSFET,
and a built-in startup delay to allow the adapter voltage
to settle down before turning on the MOSFET.
The MAX4881–MAX4884/MAX4893B are offered in a
space-saving 10-pin TDFN package and operate over
the extended -40°C to +85°C temperature range.
Features
o Overvoltage Protection Up to 28V
o Preset Overvoltage Trip Level
5.6V (MAX4881/MAX4883/MAX4893B)
4.5V (MAX4882/MAX4884)
o Internal Current-Limited Switch
1.1A (MAX4881/MAX4882)
0.7A (MAX4883/MAX4884)
0.9A (MAX4893B)
o Drives Low-Cost n-Channel MOSFET
o Internal 50ms Startup Delay
o Overvoltage Fault OV Indicator
o Current-Limit Fault FLAGI Indicator
o Undervoltage Lockout
o Thermal Shutdown Protection
o Tiny 10-Pin TDFN Package
Pin Configuration
TOP VIEW
10 9 8 7 6
*EP
MAX4881
MAX4882
MAX4883
MAX4884
+ ^MAX4893B
12345
Cell Phones
Digital Still Cameras
Applications
PDAs and Palmtop Devices
MP3 Players
3mm x 3mm TDFN
*CONNECT EXPOSED PAD TO GND.
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
OV TRIP
LEVEL (V)
CURRENT CURRENT-LIMIT
LIMIT (A)
MODE
TOP
MARK
PKG
CODE
MAX4881ETB
-40°C to +85°C 10 TDFN-EP*
5.6
MAX4882ETB
-40°C to +85°C 10 TDFN-EP*
4.5
1.1
LATCHOFF
APK
T1033-1
1.1
LATCHOFF
APL
T1033-1
MAX4883BETB -40°C to +85°C 10 TDFN-EP*
5.6
MAX4883CETB -40°C to +85°C 10 TDFN-EP*
5.6
0.7
LATCHOFF
APM
T1033-1
0.7
CONTINUOUS
APN
T1033-1
MAX4884BETB** -40°C to +85°C 10 TDFN-EP*
4.5
0.7
LATCHOFF
APO
T1033-1
MAX4884CETB** -40°C to +85°C 10 TDFN-EP*
4.5
MAX4893BETB -40°C to +85°C 10 TDFN-EP*
5.6
* EP = Exposed pad.
**Future product—contact factory for availability.
0.7
CONTINUOUS
APP
T1033-1
0.9
LATCHOFF
ATF
T1033-1
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