Rainbow Electronics MAX4987BE User Manual
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) RONinternal
nFET switch and protect low-voltage systems against voltage faults up to +28V. When the input voltage exceeds
the overvoltage threshold or decreases below the undervoltage threshold, the internal nFET switch is turned off to
prevent damage to the protected components.
All switches feature a minimum 1.5A current-limit protection. 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) threshold, 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.
Applications
Cell Phones
Media Players
Features
o Input Voltage Protection Up to +28V
o Integrated Low R
ON
(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 IEC 61000-4-2 Air Gap
±6kV IEC 61000-4-2 Contact
o Thermal-Shutdown Protection
o 2mm x 3mm, 8-Pin TDFN Package
MAX4987AE/MAX4987BE
Overvoltage-Protection Controller
with USB ESD Protection
________________________________________________________________
Maxim Integrated Products
1
Ordering Information/Selector Guide
19-1059; Rev 0; 11/07
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 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.
Typical Operating Circuit appears at end of data sheet.
Pin Configuration
134
865
OUT
V
CC
MAX4987AE/
MAX4987BE
2
7
IN
*CONNECT EXPOSED
PAD TO GND.
GND CD-CD+
TDFN-EP
2mm x 3mm
TOP VIEW
ENACOK
*EP
PART
MAX4987AEETA+ 8 TDFN-EP** AAI T823-1 2.55 6.15 Autoretry
MAX4987BEETA+* 8 TDFN-EP** AAJ T823-1 4.2 6.15 Autoretry
PINPACKAGE
TOP MARK
PACKAGE
CODE
UVLO (V) OVLO (V)
OVERCURRENT
MODE
MAX4987AE/MAX4987BE
Overvoltage-Protection Controller
with USB ESD Protection
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN= +2.2V to +28V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VIN= +5V and TA= +25°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.
(All voltages referenced to GND.)
IN ............................................................................-0.3V to +30V
OUT.............................................................-0.3V to +(IN + 0.3V)
V
CC
, EN, ACOK, CD+, CD- ......................................-0.3V to +6V
Continuous Power Dissipation (T
A
= +70°C) for multilayer board:
8-Pin TDFN (derate 16.7mW/°C above +70°C) .........1333mW
Package Junction-to-Ambient Thermal Resistance
(
θ
JA
) (Note 1) ................................................................60.0°C/W
Package Junction-to-Case Thermal Resistance
(
θ
JC
) (Note 1) ................................................................10.8°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) .........................................+300°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, go to www.maxim-ic.com/thermal-tutorial
.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNIT
ANALOG SWITCH
Input-Voltage Range V
VCC Input Voltage V
Input Supply Current I
UVLO Supply Current I
IN Undervoltage Lockout V
IN Undervoltage Lockout Hysteresis 1%
Overvoltage Trip Level V
IN Overvoltage Lockout Hysteresis 1%
Switch On-Resistance R
Overcurrent Protection Threshold I
Maximum Output Capacitance VIN = 5V, no overcurrent shutdown 1000 µF
CD+ and CD- Leakage Current I
CD+ and CD- Capacitance C
DIGITAL SIGNALS
ACOK Output Low Voltage V
ACOK High-Leakage Current V
EN Input-Voltage High V
EN Input-Voltage Low V
EN Input-Leakage Current I
IN
CC
EN = 0V, V
IN
EN = 5V, VIN > V
UVLOVIN
(VIN falling)
UVLO
(VIN rising)
OVLO
LIM
LKG_CDVCC
LEAK
(VIN rising) 5.55 6.15 6.45
(VIN falling) 5.5
VIN = 5V, I
ON
f = 1MHz, V
CD
I
OL
SINK
ACOK
IH
IL
VEN = 5.5V -1 +1 µA
< V
= 5.5V, V
= 1mA 0.4 V
= 5.5V, flag deasserted 1 µA
2.2 28 V
> V
IN
UVLO
UVLO
UVLO
MAX4987AE 2.3
MAX4987BE 3.8
MAX4987AE 2.35 2.55 2.75
MAX4987BE 3.85 4.2 4.45
= 500mA 100 200 mΩ
OUT
1.5 4.2 A
= 0V, 3.3V -300 +300 nA
CD_
= 0.5
CD_
P-P
1.4 V
60 150
50 100
3pF
5.5 V
µA
40 µA
V
V
0.4 V
MAX4987AE/MAX4987BE
Overvoltage-Protection Controller
with USB ESD Protection
_______________________________________________________________________________________ 3
Note 2: All timing is specified using 20% and 80% levels, unless otherwise noted.
ELECTRICAL CHARACTERISTICS (continued)
(VIN= +2.2V to +28V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VIN= +5V and TA= +25°C.)
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
TIMING CHARACTERISTICS (Note 2)
Debounce Time t
ACOK Assertion Time t
Switch Turn-On Time t
Switch Turn-Off Time t
Current-Limit Turn-Off Time t
Autoretry Time t
THERMAL PROTECTION
Thermal Shutdown T
Thermal-Shutdown Hysteresis 40 °C
ESD PROTECTION
All Other Pins Human Body Model ±2 kV
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNIT
INDBC
ACOKVUVLO
ON
OFF
BLANK
RETRY
SHDN
Time from V
charge-pump enable
V
UVLO
from 10% to 90% of V
VIN < V
switch off, R
Overcurrent fault to internal switch off 10 µs
From overcurrent fault to internal switch
turn-on
< VIN < V
< VIN < V
UVLO
< VIN < V
UVLO
OVLO
OVLO
or VIN > V
= 100Ω
LOAD
to
OVLO
30 ms
, to ACOK low 30 ms
, R
= 100Ω,
OUT
OVLO
LOAD
to internal
3ms
10 µs
30 ms
150 °C
Human Body Model ±15
IEC 61000-4-2 Air Gap ±15CD+ and CD-
IEC 61000-4-2 Contact ±6
kV
SWITCH ON-RESISTANCE
vs. TEMPERATURE
0
-40 10-15 35 60 85
TEMPERATURE (°C)
IN SUPPLY CURRENT (μA)
80
70
60
50
40
30
20
10
0
MAX4987AE
210146
IN SUPPLY CURRENT
vs. IN VOLTAGE
18
IN VOLTAGE (V)
22 26
MAX4987AE/BE toc01
(mΩ)
ON
R
200
180
160
140
120
100
80
60
40
20
NORMALIZED UVLO THRESHOLD
1.010
1.008
1.006
MAX4987AE/BE toc02
1.004
1.002
1.000
0.998
0.996
0.994
NORMALIZED UVLO THRESHOLD (V)
0.992
0.990
-40 10-15 356085
vs. TEMPERATURE
MAX4987AE/BE toc03
TEMPERATURE (°C)
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