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MAX4980ETA+T

P1-P3P4-P6P7-P9P10-P10
General Description
The MAX4978–MAX4981 overvoltage-protection devices
protect low-voltage systems against voltage faults up to
+28V and feature a low 85mΩ R
ON
FET, an active cur-
rent limiter, and lithium-ion battery overcharge protec-
tion (MAX4980/MAX4981). These devices are used to
protect the charger input port on a portable device.
The overvoltage protector feature protects against volt-
ages up to 28V with two different trip thresholds: 5.7V
(MAX4978/MAX4980/MAX4981) and 6.8V (MAX4979).
There is an undervoltage protector with two different trip
thresholds: 4.4V (MAX4978) and 2.63V (MAX4979/
MAX4980/MAX4981).
The overcurrent limiter and battery voltage monitor fea-
tures provide a second layer of protection for a lithium-
ion battery charger. The overcurrent limiter is available
in two different thresholds: 0.9A (MAX4978/MAX4979/
MAX4980) and 1.95A (MAX4981). Once current reach-
es the threshold, it is held for a 20ms blanking time. If
the current is still at the limit after the blanking time, the
FET is turned off, and the device restarts the cycle after
160ms. The battery voltage monitor measures the volt-
age of a lithium-ion battery and disables the FET if the
battery voltage reaches 4.4V (MAX4980/MAX4981).
The MAX4978–MAX4981 are available in a small 8-pin
TDFN (2mm x 3mm) package and are specified over
the extended -40°C to +85°C temperature range.
Applications
Features
♦ Input Voltage Protection Up to +28V
♦ Integrated nFET Switch, 85mΩ (typ)
♦ Preset Overvoltage Protection Trip Level
5.7V (typ) (MAX4978/MAX4980/MAX4981)
6.8V (typ) (MAX4979)
♦ Low-Current Undervoltage Lockout Mode
♦ Overcurrent Protection
♦ Internal 160ms (typ) Startup Delay
♦ Thermal-Shutdown Protection
♦ Battery Overcharge Protection
(MAX4980/MAX4981)
♦ Startup Debounce Time Indicator
(MAX4978/MAX4979)
♦ Small, 8-Pin (2mm x 3mm) TDFN Package
MAX4978–MAX4981
Overvoltage Protector with
Active Current Limit
________________________________________________________________
Maxim Integrated Products
1
Ordering Information/Selector Guide
19-4137; Rev 0; 5/08
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.
Note: All devices specified over the -40°C to +85°C operating temperature range.
+
Denotes a lead-free package.
*
EP = Exposed pad.
**
Future product—contact factory for availability.
PART
PIN-PACKAGE
CURRENT
LIMIT
(
mA
)
BATTERY
MONITOR
UVLO
(V)
OVLO
(V)
TOP
MARK
PKG
CODE
MAX4978ETA+
8 TDFN-EP*
900 No 4.4 5.7 AAK T823-1
MAX4979ETA+**
8 TDFN-EP*
900 No 2.63 6.8 AAL T823-1
MAX4980ETA+
8 TDFN-EP*
900 Yes 2.63 5.7 AAM T823-1
MAX4981ETA+
8 TDFN-EP*
1950 Yes 2.63 5.7 AAN T823-1
Pin Configuration
134
865
OUT
MAX4978
MAX4979
MAX4980
MAX4981
2
7
IN
(BAT) IS FOR MAX4980/MAX4981 ONLY.
*EP = EXPOSED PAD. CONNECT EP TO GND.
I.C.
TDFN-EP
TOP VIEW
I.C. GNDI.C.
*EP
EN
SDT(BAT)
Typical Application Circuit appears at end of data sheet.
Cell Phones
MP3 Players
Digital Still Cameras
PDAs and Palmtop
Devices
MAX4978–MAX4981
Overvoltage Protector with
Active Current Limit
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= 5.0V, V
EN
= 0V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
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.
(Voltages referenced to GND.)
IN, SDT ................................................................. -0.3V to +30V
OUT ........................................................................... -0.3V to IN
EN, BAT .................................................................. -0.3V to +6V
SDT Continuous Current ................................................. ±50mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin 2mm x 3mm TDFN (derate 16.7mW/°C
above +70°C) ........................................................... 1333mW
Junction-to-Case Thermal Resistance (
θ
JC
) (Note 1)
8-Pin 2mm x 3mm TDFN ......................................... 10.8°C/W
Junction-to-Ambient Thermal Resistance (
θ
JA
) (Note 1)
8-Pin 2mm x 3mm TDFN ............................................ 60°C/W
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
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Input Voltage Range V
IN
2.3 28 V
Input Supply Current I
IN
I
OUT
< I
LIM_MIN
130 190
µA
UVLO Supply Current I
UVLO
V
IN
= 2.3V 35 60 µA
Shutdown Supply Current
I
SHDN
V
EN
= 5V 15 23 µA
V
IN
falling 4.2
MAX4978
V
IN
rising 4.3 4.4 4.5
V
IN
falling 2.5
IN Undervoltage Lockout
V
UVLO
MAX4979/MAX4980/
MAX4981
V
IN
rising
2.56 2.63 2.70
V
IN Undervoltage Lockout
Hysteresis
1%
V
IN
falling 5.5
MAX4978/MAX4980/
MAX4981
V
IN
rising 5.6 5.7 5.8
V
IN
falling 6.5
IN Overvoltage Lockout
V
OVLO
MAX4979
V
IN
rising
6.65 6.80 6.95
V
1%
BAT Overvoltage Trip Level
V
BOTL
MAX4980/MAX4981, V
BAT
rising 4.3 4.4 4.5 V
BAT Overvoltage Hysteresis MAX4980/MAX4981 1 %
BAT Input Leakage Current I
LKGB
MAX4980/MAX4981, V
BAT
= 4.2V 1 µA
Switch On-Resistance R
ON
I
OUT
= 100mA 85
160
mΩ
T
A
=+25°C
850 900 950
T
A
= 0°C to +85°C
800 1000
MAX4978, MAX4979,
MAX4980
T
A
= -40°C to +0°C
780 1000
T
A
=+25°C
1850 1950 2050
Overcurrent Protection Threshold I
LIM
MAX4981
T
A
= -40°C to +85°C 1750 1950 2150
mA
Thermal Shutdown
T
SHDN
T
A
rising
160
°C
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a 4-layer
board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial
.
MAX4978–MAX4981
Overvoltage Protector with
Active Current Limit
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 5.0V, V
EN
= 0V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Thermal-Shutdown Hysteresis 10 °C
EN Input High Voltage V
IH
1.5 V
EN Input Low Voltage V
IL
0.6 V
EN Input Leakage Current I
LKGE
V
EN
= 5.5V or 0V -1 +1 µA
SDT Output Low Voltage V
OL
MAX4978/MAX4979, I
SINK
= 20mA 1 V
SDT Leakage Current I
LKGS
MAX4978/MAX4979, V
SDT
= 28V, SDT
deasserted
1µA
DYNAMIC (Note 3)
IN Debounce Time t
DEB
V
UVLO
< V
IN
< V
OVLO
to charge-pump
enable, Figure 1
120 160 200
ms
Switch Turn-On Time t
ON
Time from V
OUT
= 10% of V
IN
to V
OUT
= 90%
of V
IN
, R
L
= 10Ω, C
L
= 10µF
1.5 ms
Switch Turn-Off Time t
OFF
V
IN
< V
UVLO
or V
IN
> V
OVLO
to internal
switch off, R
L
= 1kΩ
515µs
Current-Limit Blanking Time
t
BLANK
Short circuit applied, Figure 1 15 20 25 ms
Current-Limit Reaction Time t
REAC
Short circuit applied 5 µs
Overcurrent Autoretry Time
t
RETRY
Figure 1
120 160 200
ms
Note 2: All devices are 100% production tested at T
A
= +25°C. Specifications over -40°C to +85°C are guaranteed by design.
Note 3: All timing is measured using 10% and 90% levels, unless otherwise noted.
P1-P3P4-P6P7-P9P10-P10

MAX4980ETA+T

Mfr. #:
Buy MAX4980ETA+T
Manufacturer:
Maxim Integrated
Description:
Current & Power Monitors & Regulators Overvoltage-Protect Controller
Lifecycle:
New from this manufacturer.
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