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PDF MAX4987AE Data sheet ( Hoja de datos )
| Número de pieza | MAX4987AE | |
| Descripción | Overvoltage-Protection Controller | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-1059; Rev 0; 11/07
Overvoltage-Protection Controller
with USB ESD Protection
www.datasheet4u.com
General Description
The MAX4987AE/MAX4987BE are overvoltage protection
devices with built-in ESD protection for USB data lines.
These devices feature a low 100mΩ (typ) RON internal
nFET switch and protect low-voltage systems against volt-
age faults up to +28V. When the input voltage exceeds
the overvoltage threshold or decreases below the under-
voltage threshold, the internal nFET switch is turned off to
prevent damage to the protected components.
All switches feature a minimum 1.5A current-limit pro-
tection. During a short-circuit occurrence, the switch
operates in an autoretry mode where the internal nFET
switch is turned on to check if the fault has been
removed. The autoretry interval is 30ms, and if the fault
is removed, the nFET switch remains on.
The MAX4987AE/MAX4987BE feature low-capacitance
(3pF) ESD protection for USB data lines that allow
transmission of high-speed USB 2.0 signals.
The overvoltage threshold (OVLO) is preset to 6.15V.
The undervoltage thresholds (UVLO) are preset to 2.55V
(MAX4987AE) or 4.2V (MAX4987BE). When the input
voltage drops below the undervoltage (UVLO) thresh-
old, the devices enter a low-current standby mode.
All devices are offered in a small 2mm x 3mm, 8-pin
TDFN package and operate over the -40°C to +85°C
extended temperature range.
Cell Phones
Media Players
Applications
Typical Operating Circuit appears at end of data sheet.
Features
o Input Voltage Protection Up to +28V
o Integrated Low RON (100mΩ) nFET Switch
o Internal Overcurrent Protection 1.5A (min)
o Overcurrent Protection (Autoretry)
o Enable Input
o Internal 30ms Startup Delay
o Low-Capacitance USB High-Speed Data Line ESD
Protection (3pF)
±15kV Human Body Model
±15kV IEC61000-4-2 Air Gap
±6kV IEC61000-4-2 Contact
o Thermal-Shutdown Protection
o 2mm x 3mm, 8-Pin TDFN Package
TOP VIEW
Pin Configuration
OUT ACOK EN VCC
8765
MAX4987AE/
MAX4987BE
*CONNECT EXPOSED
PAD TO GND.
*EP
1 234
IN CD+ GND CD-
TDFN-EP
2mm x 3mm
Ordering Information/Selector Guide
PART
MAX4987AEETA+
MAX4987BEETA+*
PIN-
PACKAGE
8 TDFN-EP**
8 TDFN-EP**
TOP MARK
AAI
AAJ
PACKAGE
CODE
T823-1
T823-1
UVLO (V)
2.55
4.2
Note: All devices are specified over the -40°C to +85°C operating temperature range.
+Denotes a lead-free package.
*Future product—contact factory for availability.
**EP = Exposed paddle.
OVLO (V)
6.15
6.15
OVERCURRENT
MODE
Autoretry
Autoretry
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
Overvoltage-Protection Controller
with USB ESD Protection
www.datasheet4u.com
PIN NAME
1 IN
2 CD+
3 GND
4 CD-
5 VCC
6 EN
7 ACOK
8 OUT
EP EP
Pin Description
FUNCTION
Voltage Input. Bypass IN with a 1µF ceramic capacitor as close to the device as possible to obtain
±15kV HBM ESD protection. No capacitor required to obtain ±2kV HBM ESD protection.
USB Data Line
Ground
USB Data Line
Positive Supply-Voltage Input. VCC is required only when USB signals are present.
Enable Active-Low Input. Drive EN low to enable the switch. Drive EN high to disable the switch.
Open-Drain Adapter-Voltage Indicator Output. ACOK is driven low after the VIN voltage is stable
between UVLO and OVLO for 30ms (typ). Connect a pullup resistor from ACOK to the logic I/O voltage
of the host system.
Output Voltage. Output of internal switch.
Exposed Pad. Connect exposed pad to ground. Do not use EP as a sole ground connection.
Functional Diagram
IN OUT
OVERCURRENT
FAULT
CHARGE
PUMP
ACOK
VBG
REFERENCE
+ OV
-
+
- UV
CONTROL
LOGIC
EN
EN
VCC
CD+
CD-
MAX4987AE/
MAX4987BE
GND
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet MAX4987AE.PDF ] | |
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