MAX4981ETA+T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX4981ETA+T ,Overvoltage Protector with Active Current LimitApplications*EPCell Phones PDAs and PalmtopDevicesMP3 Players13 2 4Digital Still CamerasSDT(BAT)IN ..
MAX4983EEVB+ ,High-Speed USB 2.0 Switches with ±15kV ESDfeatures an active-high enableActive-High (EN) MAX4984Einput (EN) that when driven low sets the dev ..
MAX4983EEVB+T ,High-Speed USB 2.0 Switches with ±15kV ESDFeaturesThe MAX4983E/MAX4984E are high ESD-protected♦ USB Hi-Speed Switchinganalog switches that co ..
MAX4984EEVB+T ,High-Speed USB 2.0 Switches with ±15kV ESDapplications. COM1 and COM2 are protectedagainst ±15kV ESD without latchup or damage. The ±15kV IEC ..
MAX498CWI ,Quad/Triple, SPDT, RGB Switches with 250MHz Video Buffer AmplifiersFeaturesThe MAX498/MAX499 are high-speed, quad/triple, sin-' High Speed:gle-pole/double-throw video ..
MAX4995AAUT+ ,50mA to 600mA Programmable Current-Limit SwitchesApplicationscurrent blocking to prevent current from being drivenback into the source.SDIO Ports Ce ..
MAX913CSA ,Single/Dual / Ultra-Fast / Low-Power / Precision TTL ComparatorsGeneral Description ________
MAX913CSA ,Single/Dual / Ultra-Fast / Low-Power / Precision TTL ComparatorsApplications MAX912ESE -40°C to +85°C 16 Narrow SOMAX912MJE -55°C to +125°C 16 CERDIPZero-Crossing ..
MAX913CSA ,Single/Dual / Ultra-Fast / Low-Power / Precision TTL Comparatorsapplications such asV/F converters or switching regulators.' No Power-Supply Current SpikingThe MAX ..
MAX913CSA. ,Single/Dual / Ultra-Fast / Low-Power / Precision TTL ComparatorsELECTRICAL CHARACTERISTICS(V+ = +5V, V- = -5V, V = 1.4V, V = 0V, T = T to T , unless otherwise note ..
MAX913CSA+ ,Single/Dual, Ultra-Fast, Low-Power, Precision TTL Comparatorsapplications such as♦ No Minimum Input Signal Slew-Rate RequirementV/F converters or switching regu ..
MAX913CSA+T ,Single/Dual, Ultra-Fast, Low-Power, Precision TTL ComparatorsELECTRICAL CHARACTERISTICSV+ = +5V, V- = -5V, V = 1.4V, V = 0V, T = T to T , unless otherwise noted ..

MAX4981ETA+T
Overvoltage Protector with Active Current Limit
General Description
The MAX4978–MAX4981 overvoltage-protection devices
protect low-voltage systems against voltage faults up to
+28V and feature a low 85mΩRONFET, 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
FeaturesInput Voltage Protection Up to +28VIntegrated nFET Switch, 85mΩ(typ)Preset Overvoltage Protection Trip Level
5.7V (typ) (MAX4978/MAX4980/MAX4981)
6.8V (typ) (MAX4979)Low-Current Undervoltage Lockout ModeOvercurrent ProtectionInternal 160ms (typ) Startup DelayThermal-Shutdown ProtectionBattery 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
Ordering Information/Selector Guide
19-4137; Rev 0; 5/08
Note:All devices specified over the -40°C to +85°C operating temperature range.
+Denotes a lead-free package.
*EP = Exposed pad.
PARTPIN-PACKAGECURRENT
LIMIT (mA)
BATTERY
MONITOR
UVLO
(V)
OVLO
(V)
TOP
MARK
PKG
CODE
MAX4978ETA+8 TDFN-EP*900No4.45.7AAKT823-1
MAX4979ETA+**8 TDFN-EP*900No2.636.8AALT823-1
MAX4980ETA+8 TDFN-EP*900Yes2.635.7AAMT823-1
MAX4981ETA+8 TDFN-EP*1950Yes2.635.7AANT823-1
Pin Configuration45
OUT
MAX4978
MAX4979
MAX4980
MAX4981
(BAT) IS FOR MAX4980/MAX4981 ONLY.
*EP = EXPOSED PAD. CONNECT EP TO GND.
I.C.
TDFN-EP
TOP VIEWI.C.GNDI.C.
*EPSDT(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
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN= 5.0V, VEN= 0V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +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
SDTContinuous Current .................................................±50mA
Continuous Power Dissipation (TA= +70°C)
8-Pin 2mm x 3mm TDFN (derate 16.7mW/°C
above +70°C) ...........................................................1333mW
Junction-to-Case Thermal Resistance (θJC) (Note 1)
8-Pin 2mm x 3mm TDFN .........................................10.8°C/W
Junction-to-Ambient Thermal Resistance (θJA) (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
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Input Voltage RangeVIN2.328V
Input Supply CurrentIINIOUT < ILIM_MIN130190µA
UVLO Supply CurrentIUVLOVIN = 2.3V3560µA
Shutdown Supply CurrentISHDNV EN = 5V1523µA
VIN falling4.2MAX4978VIN rising4.34.44.5
VIN falling2.5IN Undervoltage LockoutVUVLO
MAX4979/MAX4980/
MAX4981VIN rising2.562.632.70
IN Undervoltage Lockout
Hysteresis1%
VIN falling5.5MAX4978/MAX4980/
MAX4981VIN rising5.65.75.8
VIN falling6.5IN Overvoltage LockoutVOVLO
MAX4979VIN rising6.656.806.95
IN Overvoltage Lockout Hysteresis1%
BAT Overvoltage Trip LevelVBOTLMAX4980/MAX4981, VBAT rising4.34.44.5V
BAT Overvoltage HysteresisMAX4980/MAX49811%
BAT Input Leakage CurrentILKGBMAX4980/MAX4981, VBAT = 4.2V1µA
Switch On-ResistanceRONIOUT = 100mA85160mΩ
TA=+25°C850900950
TA= 0°C to +85°C8001000MAX4978, MAX4979,
MAX4980
TA= -40°C to +0°C7801000
TA=+25°C185019502050
Overcurrent Protection ThresholdILIM
MAX4981TA= -40°C to +85°C175019502150
Thermal ShutdownTSHDNTA rising160°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 /thermal-tutorial.
MAX4978–MAX4981
Overvoltage Protector with
Active Current Limit
ELECTRICAL CHARACTERISTICS (continued)
(VIN= 5.0V, VEN= 0V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Thermal-Shutdown Hysteresis10°C
EN Input High VoltageVIH1.5V
EN Input Low VoltageVIL0.6V
EN Input Leakage CurrentILKGEV EN = 5.5V or 0V-1+1µA
SDT Output Low VoltageVOLMAX4978/MAX4979, ISINK = 20mA1V
SDT Leakage CurrentILKGSMAX4978/MAX4979, V SDT = 28V, SDT
deasserted1µA
DYNAMIC (Note 3)
IN Debounce TimetDEBVUVLO < VIN < VOVLO to charge-pump
enable, Figure 1120160200ms
Switch Turn-On TimetONTime from VOUT = 10% of VIN to VOUT = 90%
of VIN, RL = 10Ω, CL = 10µF1.5ms
Switch Turn-Off TimetOFFVIN < VUVLO or VIN > VOVLO to internal
switch off, RL = 1kΩ515µs
Current-Limit Blanking TimetBLANKShort circuit applied, Figure 1152025ms
Current-Limit Reaction TimetREACShort circuit applied5µs
Overcurrent Autoretry TimetRETRYFigure 1120160200ms
Note 2:All devices are 100% production tested at TA= +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.
MAX4978–MAX4981
Overvoltage Protector with
Active Current Limit
Timing Diagram
tDEBtDEBtRETRYtRETRY
SDT
UVLO
OVLO
OUT
CURRENT LIMIT
LOAD CURRENT
tBLANKtBLANKtBLANK
Figure 1. Timing Diagram
MAX4978–MAX4981
Overvoltage Protector with
Active Current Limit
Typical Operating Characteristics
(VIN= 5.0V, EN= GND, TA= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX4978-81 toc01
VIN (V)
IIN2717127
MAX4980/MAX4981
MAX4978
NORMALIZED ON-RESISTANCE
vs. TEMPERATURE
MAX4978-81 toc02
TEMPERATURE (°C)
NORMALIZED ON-RESISTANCE60-153585
NORMALIZED UVLO THRESHOLD
vs. TEMPERATURE
MAX4978-81 toc03
TEMPERATURE (°C)
NORMALIZED UVLO THRESHOLD60-153585
NORMALIZED OVLO THRESHOLD
vs. TEMPERATURE
MAX4978-81 toc04
TEMPERATURE (°C)
NORMALIZED OVLO THRESHOLD60-153585
BATTERY OVERVOLTAGE THRESHOLD
vs. TEMPERATURE
MMAX4978-81 toc05
TEMPERATURE (°C)
BATTERY OVERVOLTAGE THRESHOLD60-153585
NORMALIZED CURRENT LIMIT
vs. TEMPERATURE
MMAX4978-81 toc06
TEMPERATURE (°C)
NORMALIZED CURRENT LIMIT60-153585
NORMALIZED STARTUP DELAY/AUTORETRY/
BLANKING TIME vs. TEMPERATURE
MAX4978-81 toc07
TEMPERATURE (°C)
NORMALIZED STARTUP DELAY/AUTORETRY/BLANKING TIME1060-153585
POWER-UP RESPONSE
MAX4978-81 toc08
5V/div
5V/div
5V/div
40ms/div
VIN
VOUT
VSDT
OVERVOLTAGE FAULT RESPONSE
MAX4978-81 toc09
4μs/div
RL = 1kΩ
2V/div
2V/div
VIN
VOUT
MAX4978–MAX4981
Overvoltage Protector with
Active Current Limit
Pin Description
PIN
MAX4978/
MAX4979
MAX4980/
MAX4981
NAMEFUNCTIONIN
Supply Voltage Input. IN powers the charge pump required to turn on the internal FET.
When the correct adapter is plugged in, a 160ms debounce timer prevents a false turn-on of
the internal FET. Bypass IN to GND with a 1µF ceramic capacitor as close to the device as
possible to enable ±15kV (HBM) ESD protection.SDTStartup Debounce Time Indicator. SDT is an active-low open-drain output that asserts low
during the debounce/autoretry time.BATBattery Monitor Input. Connect BAT to Li-ion battery terminal. Bypass BAT to GND with a 1µF
ceramic capacitor as close to the device as possible to enable ±15kV (HBM) ESD protection.
3, 6, 73, 6, 7I.C.Internally Connected. Connect I.C. to GND.ENActi ve- Low E nab l e Inp ut. D r i ve E N l ow for nor m al op er ati on. D r i ve E N hi g h to d i sab l e the d evi ce.GNDGroundOUTOutput Voltage. Output of internal FET.EPExposed Pad. Internally connected to GND. Connect EP to a large ground plane to maximize
thermal performance. Do not use EP as the sole GND connection.
Typical Operating Characteristics (continued)
(VIN= 5.0V, EN= GND, TA= +25°C, unless otherwise noted.)
UNDERVOLTAGE FAULT RESPONSE
MAX4978-81 toc10
4μs/div
2V/div
2V/div
VIN
VOUT
BATTERY OVERVOLTAGE FAULT RESPONSE
MAX4978-81 toc11
2μs/div
RL = 1kΩ
2V/div
2V/div
VBAT
VOUT
SHORT-CIRCUIT RESPONSE
MAX4978-81toc12
100ms/div
5V/div
5V/div
1A/div
VIN
VOUT
IOUT
VSDT

Partno	Mfg	Dc	Qty	Available	Descript
MAX4981ETA+T	MAXIM	N/a	477	avai	Overvoltage Protector with Active Current Limit