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
MAX4881–MAX4884/MAX4893B
Pin Configuration
FLAGI
N.C.
BTB
7
4
BTA
OV
TOP VIEW
10
*EP
9
8
+
1
IN
MAX4881
MAX4882
MAX4883
MAX4884
MAX4893B
2
EN
3
GATE
5
CB
Applications
Cell Phones
Digital Still Cameras
PDAs and Palmtop Devices
MP3 Players
OV
TRIP
LEVEL (V)
5.6
4.5
5.6
5.6
4.5
4.5
5.6
3mm x 3mm TDFN
*CONNECT EXPOSED PAD TO GND.
Ordering Information
CURRENT
LIMIT (A)
1.1
1.1
0.7
0.7
0.7
0.7
0.9
CURRENT-LIMIT
MODE
LATCHOFF
LATCHOFF
LATCHOFF
CONTINUOUS
LATCHOFF
CONTINUOUS
LATCHOFF
TOP
MARK
APK
APL
APM
APN
APO
APP
ATF
PKG
CODE
T1033-1
T1033-1
T1033-1
T1033-1
T1033-1
T1033-1
T1033-1
PART
MAX4881ETB
MAX4882ETB
MAX4883BETB
MAX4883CETB
MAX4884BETB**
MAX4884CETB**
MAX4893BETB
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
PIN-PACKAGE
10 TDFN-EP*
10 TDFN-EP*
10 TDFN-EP*
10 TDFN-EP*
10 TDFN-EP*
10 TDFN-EP*
10 TDFN-EP*
*
EP = Exposed pad.
**Future
product—contact factory for availability.
________________________________________________________________
Maxim Integrated Products
1
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.
GND
6
Overvoltage Protection Controllers with
Current Limit in TDFN
MAX4881–MAX4884/MAX4893B
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND.)
IN ............................................................................-0.3V to +30V
GATE ......................................................................-0.3V to +12V
EN,
CB
,
OV, FLAGI,
BTA, BTB ................................-0.3V to +6V
Continuous Power Dissipation (T
A
= +70°C)
10-Pin TDFN (derate 18.5mW/°C above +70°C) .....1481.5mW
Operating Temperature Range ..........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
IN
= +5V (MAX4881/MAX4883/MAX4893B), V
IN
= +4V (MAX4882/MAX4884), T
A
= -40°C to +85°C, unless otherwise noted. Typical
values are at T
A
= +25°C.) (Note 1)
PARAMETER
INPUT VOLTAGE (IN)
Input Voltage Range
Overvoltage Trip Level
Overvoltage-Trip-Level
Hysteresis
Undervoltage Lockout Threshold
Undervoltage Lockout Hysteresis
Supply Current
INTERNAL SWITCH
BTA Input Range
BTA Undervoltage Lockout
BTA-Undervoltage-Lockout
Hysteresis
MAX4881/MAX4882, V
BTB
= GND
Switch-Forward Current Limit
I
FWD
MAX4883/MAX4884, V
BTB
= GND
MAX4893B, V
BTB
= GND
MAX4881/MAX4882
Switch-Reverse Current Limit
I
REV
MAX4883/MAX4884
MAX4893B
V
BTA
= 5V
(MAX4881/MAX4883/MAX4893B)
Voltage Drop (V
BTA
- V
BTB
)
I
L
= 400mA
V
BTA
= 4V
(MAX4882/MAX4884)
20
V
EN
= 0, V
CB
= 0
50
1.00
0.600
0.800
V
BTA
BTA
UVLO
V
BTA
falling
2.8
2.4
50
1.1
0.7
1.25
0.775
1
1.25
0.775
1
110
mV
110
80
1
ms
µA
A
A
5.7
2.7
V
V
mV
I
IN
+ I
BTA
No load, V
EN
= 0 or 5.5V,
V
IN
= V
OVLO (MIN)
- 0.1V, V
CB
= V
IN
UVLO
V
IN
falling
MAX4881/MAX4883/MAX4893B
MAX4882/MAX4884
4.2
2.4
V
IN
OVLO
V
IN
rising
MAX4881/MAX4883/MAX4893B
MAX4882/MAX4884
1.2
5.5
4.4
5.6
4.5
50
4.35
2.55
50
240
380
4.5
2.7
28.0
5.7
4.6
V
V
mV
V
mV
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Blanking Time
BTB Off Current
t
BLANK
I
BTB-OFF
2
_______________________________________________________________________________________
Overvoltage Protection Controllers with
Current Limit in TDFN
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +5V (MAX4881/MAX4883/MAX4893B), V
IN
= +4V (MAX4882/MAX4884), T
A
= -40°C to +85°C, unless otherwise noted. Typical
values are at T
A
= +25°C.) (Note 1)
PARAMETER
GATE
I
GATE
sourcing
1µA
V
IN
= 5V
(MAX4881/MAX4883/MAX4893B)
V
IN
= 4.3V
(MAX4882/MAX4884)
9
7.6
60
20
20
50
50
7
6
20
µs
V
IN
increasing from 4V to 7V at 3V/µs,
V
GATE
= 0.3V, C
GATE
= 1500pF (Figure 2)
(MAX4882/MAX4884)
V
IN
increasing from 5V to 8V at 3V/µs,
V
OV
= 0.4V (Figure 2)
(MAX4881/MAX4883/MAX4893B)
V
IN
increasing from 4V to 7V at 3V/µs,
V
OV
= 0.4V (Figure 2) (MAX4882/MAX4884)
Initial Overvoltage Fault Delay
Disable Time
EN,
CB INPUTS
Input-High Voltage
Input-Low Voltage
Input Leakage
OV, FLAGI
OUTPUTS
Output Voltage Low
Leakage Current
THERMAL PROTECTION
Thermal Shutdown
Thermal Hysteresis
150
40
°C
°C
V
OL
I
SINK
= 1mA,
OV, FLAGI
assert
V
FLAGI
= V
OV
= 5.5V
0.4
1
V
µA
V
IH
V
IL
1.4
0.5
1
V
V
µA
t
OVP
t
DIS
V
IN
increasing from 0 to 8V,
I
GATE
= 80% of I
PD
(Figure 3)
V
EN
= 2.4V, V
GATE
= 0.3V (Figure 4)
6
20
80
80
10
V
8.6
mA
ms
ms
ms
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX4881–MAX4884/MAX4893B
GATE Voltage
V
GATE
GATE Pulldown Current
TIMING
Startup Delay
OV
Blanking Time
GATE Turn-On Time
I
PD
t
START
t
OV-BLANK
t
GON
V
IN
> V
OVLO
, V
GATE
= 5.5V
V
IN
> V
UVLO
, V
GATE
> 0.3V (Figure 1)
V
GATE
= 0.3V, V
OV
= 2.4V (Figure 1)
V
GATE
= 0.3V to 7V, C
GATE
= 1500pF (Figure 1)
V
IN
increasing from 5V to 8V at 3V/µs,
V
GATE
= 0.3V, C
GATE
= 1500pF (Figure 2)
(MAX4881/MAX4883/MAX4893B)
GATE Turn-Off Time
t
GOFF
5.8
µs
5.8
100
580
ns
ns
OV
Assertion Delay
t
OV
Note 1:
All devices are 100% tested at T
A
= +25°C.
Electrical limits over the full temperature range are guaranteed by design.
_______________________________________________________________________________________
3
Overvoltage Protection Controllers with
Current Limit in TDFN
MAX4881–MAX4884/MAX4893B
Typical Operating Characteristics
(V
IN
= 5V, T
A
= +25°C, unless otherwise noted.)
I
IN
+ I
BTA
CURRENT vs. INPUT VOLTAGE
MAX4881 toc01
I
IN
+ I
BTA
CURRENT vs. TEMPERATURE
MAX4881 toc02
GATE VOLTAGE vs. INPUT VOLTAGE
(MAX4884)
OVLO TRIP POINT
9
GATE VOLTAGE (V)
MAX4881 toc03
400
350
I
IN
+ I
BTA
CURRENT (µA)
300
250
200
150
100
50
0
0
5
10
15
20
INPUT VOLTAGE (V)
25
UVLO TRIP POINT
V
EN
= 0
V
CB
= 5V
OVLO TRIP POINT
400
350
I
IN
+ I
BTA
CURRENT (µA)
300
250
200
150
100
50
0
12
UVLO TRIP POINT
6
3
0
-40
-15
10
35
TEMPERATURE (°C)
60
85
0
1
2
3
4
5
6
INPUT VOLTAGE (V)
7
8
30
GATE VOLTAGE vs. INPUT VOLTAGE
(MAX4881)
MAX4881 toc04
BTB OFF CURRENT vs. TEMPERATURE
V
EN
= 0
V
CB
= 0
V
BTB
= 5.5V
MAX4881 toc05
POWER-UP RESPONSE (MAX4884)
MAX4881 toc06
12
OVLO TRIP POINT
UVLO TRIP POINT
9
GATE VOLTAGE (V)
1000
100
BTB OFF CURRENT (nA)
IN
GATE
5V
10V
0
5V
10
1
BTA
0
5V
0.1
OV
0
6
3
0
0
1
2
3
4
5
6
INPUT VOLTAGE (V)
7
8
0.01
-40
-15
10
35
TEMPERATURE (°C)
60
85
20ms/div
POWER-DOWN RESPONSE (MAX4884)
MAX4881 toc07
EN vs. GATE (MAX4884)
MAX4881 toc08
OVERVOLTAGE RESPONSE (MAX4884)
MAX4881 toc09
IN
10V
GATE
0
BTA
5V
EN
0
5V
0
IN
6V
3V
5V
0
5V
OV
0
20ms/div
100µs/div
GATE
10V
GATE
0
5V
0
OV
20mA
I
GATE
0
400ns/div
4
_______________________________________________________________________________________
Overvoltage Protection Controllers with
Current Limit in TDFN
Typical Operating Characteristics (continued)
(V
IN
= 5V, T
A
= +25°C, unless otherwise noted.)
MAX4881–MAX4884/MAX4893B
CURRENT LIMIT vs. TEMPERATURE
(MAX4884)
700
600
CURRENT LIMIT (mA)
500
400
300
200
100
0
-40
-15
10
35
TEMPERATURE (°C)
60
85
V
IN
= 4.4V
V
BTB
= 2.7V
V
CB
= 5V
CURRENT LIMIT (A)
0.75
MAX4881 toc10
CURRENT LIMIT vs. TEMPERATURE
(MAX4881)
MAX4881 toc11
800
1.25
1.00
0.50
V
IN
= 5V
V
BTB
= 2.7V
V
CB
= 5V
-40
-15
10
35
TEMPERATURE (°C)
60
85
0.25
0
CURRENT LIMIT vs. V
BTB
(MAX4884)
MAX4881 toc12
CURRENT LIMIT vs. V
BTB
(MAX4881)
MAX4881 toc13
800
700
600
CURRENT LIMIT (mA)
500
400
300
200
100
0
0
1
2
V
BTB
(V)
3
4
5
V
IN
= 4.4V
V
CB
= 5V
1.25
1.00
CURRENT LIMIT (A)
0.75
0.50
0.25
V
IN
= 5V
V
CB
= 5V
0
0
1
2
V
BTB
(V)
3
4
5
_______________________________________________________________________________________
5
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