Rainbow Electronics MAX4884 - Manual

General Description
The MAX4881–MAX4884 overvoltage protection (OVP)
controllers with built-in current-limited switch, protect low-
voltage systems against voltages of up to 28V. When the
input voltage exceeds the overvoltage trip level of 5.6V
(MAX4881/MAX4883) or 4.5V (MAX4882/MAX4884), the
external n-channel MOSFET is turned off to prevent dam-
age to the protected components. An undervoltage/over-
voltage flag indicator (OV) notifies the processor that an
undervoltage/overvoltage fault condition is present.
The MAX4881/MAX4882 feature an internal 1.1A cur-
rent-limited switch, while the MAX4883B/MAX4883C/
MAX4884B/MAX4884C include an internal 0.7A 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 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 have a control input (CB) that
is used to turn on and off the internal current-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 is offered in a space-saving
10-pin TDFN package and is specified for operation
over the extended -40°C to +85°C temperature range.
Applications
Features
♦ Overvoltage Protection Up to 28V
♦ Preset Overvoltage Trip Level
5.6V (MAX4881/MAX4883)
4.5V (MAX4882/MAX4884)
♦ Internal Current-Limited Switch
1.1A (MAX4881/MAX4882)
0.7A (MAX4883/MAX4884)
♦ Drives Low-Cost n-Channel MOSFET
♦ Internal 50ms Startup Delay
♦ Overvoltage Fault OV Indicator
♦ Current-Limit Fault FLAGI Indicator
♦ Undervoltage Lockout
♦ Thermal Shutdown Protection
♦ Tiny 10-Pin TDFN Package
MAX4881–MAX4884
Overvoltage Protection Controllers with
Current Limit in TDFN
________________________________________________________________ Maxim Integrated Products 1
OV FLAGI GND BTB
MAX4881
MAX4882
MAX4883
MAX4884
N.C.
IN
GATE
BTA
EN
3mm x 3mm TDFN
TOP VIEW
CB
1 3 4
10 8 7
2
9
5
6
Pin Configuration
Ordering Information
19-3777; Rev 0; 7/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
PART TEMP RANGE PIN-PACKAGE
OV TRIP LEVEL
(V)
CURRENT LIMIT
(A)
CURRENT-LIMIT
MODE
TOP
MARK
MAX4881ETB -40°C to +85°C 10 TDFN-EP* 5.6 1.1 LATCH-OFF APK
MAX4882ETB -40°C to +85°C 10 TDFN-EP* 4.5 1.1 LATCH-OFF APL
MAX4883BETB -40°C to +85°C 10 TDFN-EP* 5.6 0.7 LATCH-OFF APM
MAX4883CETB** -40°C to +85°C 10 TDFN-EP* 5.6 0.7 CONTINUOUS APN
MAX4884BETB** -40°C to +85°C 10 TDFN-EP* 4.5 0.7 LATCH-OFF APO
MAX4884CETB** -40°C to +85°C 10 TDFN-EP* 4.5 0.7 CONTINUOUS APP
Cell Phones
Digital Still Cameras PDAs and Palmtop Devices
MP3 Players
* EP = Exposed pad
**Future product—contact factory for availability.