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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1694 Datasheet

USB Current-Limited Switches with Fault Blanking

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19-1518; Rev 0; 9/99
USB Current-Limited Switches
with Fault Blanking
General Description
The MAX1693/MAX1694 are current-limited, 60m
switches with built-in fault blanking. Their accurate pre-
set current limit of 0.7A to 1.0A makes them ideally suit-
ed for USB applications. Their low quiescent supply
current (14µA) and shutdown current (1µA) conserve
battery power in portable applications. The MAX1693/
MAX1694 operate with inputs from +2.7V to +5.5V,
making them ideal for both +3V and +5V systems.
A fault signal notifies the microprocessor that the inter-
nal current limit has been reached. A 10ms fault-blank-
ing feature allows momentary faults (such as those
caused when hot-swapping into a capacitive load) to
be ignored, thus preventing false alarms to the host
system. This fault blanking also prevents a fault signal
from being issued when the device is powering up.
In the MAX1693, an output overcurrent condition caus-
es the switch to current limit at 0.7A to 1.0A and FAULT
to go low after the 10ms blanking period. When the
overcurrent condition is removed, FAULT returns to its
high-impedance state. In the MAX1694, any overcur-
rent longer than 10ms will latch the switch open and set
FAULT low. The latch is cleared by cycling the ON
input or by powering up the device again. This feature
saves power by preventing the device from thermally
cycling on and off in case of a persistent short-circuit
condition.
The MAX1693/MAX1694 have several safety features to
ensure that the USB port is protected. Built-in thermal-
overload protection limits power dissipation and junc-
tion temperatures. Both devices have accurate internal
current-limiting circuitry to protect the input supply
against overload. They are available in space-saving
10-pin µMAX packages.
Pin Configuration
TOP VIEW
IN 1
OUT 2
IN 3
OUT 4
ON 5
MAX1693
MAX1694
µMAX
10 OUT
9 IN
8 OUT
7 FAULT
6 GND
Features
o Accurate Current Limit (0.7A min, 1.0A max)
o Guaranteed 0.75A Short-Circuit Protection
o 10ms Internal Fault-Blanking Timeout
o No Fault Signal During Power-Up
o Latched FAULT Output Turns Off Power Switch
(MAX1694)
o Thermal Shutdown Protection
o +2.7V to +5.5V Supply Range
o 14µA Supply Current
o Small 10-Pin µMAX Package
o UL Recognition Pending
Applications
USB Ports and Hubs
Notebook Computers
Portable Equipment
Docking Stations
Hot Plug-In Power Supplies
Battery-Charger Circuits
Ordering Information
PART
MAX1693EUB
MAX1694EUB
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
10 µMAX
10 µMAX
Typical Operating Circuit
INPUT
+2.7V TO +5.5V
OFF
ON
IN OUT
MAX1693
MAX1694
FAULT
ON
GND
OUTPUT
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1694 Datasheet

USB Current-Limited Switches with Fault Blanking

No Preview Available !

USB Current-Limited Switches
with Fault Blanking
ABSOLUTE MAXIMUM RATINGS
IN, ON, FAULT to GND.............................................-0.3V to +6V
OUT to GND ................................................-0.3V to (VIN + 0.3V)
Maximum Continuous Switch Current .....1.2A (internally limited)
OUT Short Circuit to GND ..........................................Continuous
Continuous Power Dissipation (TA = +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C) ............444mW
Operating Temperature Range
MAX1693EUB/MAX1694EUB ..........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+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
(VIN = +5V, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
Operating Voltage
Quiescent Current
Off-Supply Current
Undervoltage Lockout
SYMBOL
VIN
IQ
UVLO
CONDITIONS
Timer not running
V ON = GND, IOUT = 0 Timer running
V ON = VIN = VOUT = 5.5V
Rising edge, 100mV hysteresis
Off-Switch Leakage
V ON = VIN,
VIN = 5.5V,
VOUT = GND
TA = +25°C
TA = 0°C to +85°C
On-Resistance
Current Limit
Continuous Short-Circuit
Current Limit
ON Input Logic Low Voltage
ON Input Logic High Voltage
ON Input Leakage
FAULT Output Logic Low
Voltage
RON
ILIMIT
ISC
VIL
VIH
VOL
TA = +25°C
TA = 0°C to +85°C
(Note 1)
VIN = 4.4V to 5.5V
VIN = 4.4V to 5.5V
VIN = 3V
OUT shorted to GND, MAX1693 only (Note 2)
VIN = 2.7V to 5.5V
VIN = 2.7V to 3.6V
VIN = 3.7V to 5.5V
V ON = VIN or GND
ISINK = 1mA, VIN = 3V
FAULT Output High Leakage
Current
Fault-Blanking Timeout Period
Start-Up Time
Switch Turn-On Time
Switch Turn-Off Time
Thermal Shutdown Threshold
VIN = VFAULT = 5.5V
tFB From overcurrent condition to FAULT assertion
VIN = 5V, COUT = 150µF, RL = 15,
from ON driven low to 50% full VOUT
tON ILOAD = 400mA
tOFF ILOAD = 400mA
MIN
2.7
2.0
700
2
2.4
7
3
TYP
14
35
0.001
0.01
60
72
850
500
10
1
80
6
165
MAX
5.5
25
UNITS
V
µA
1
2.6
2
15
90
125
150
1000
µA
V
µA
m
mA
700 mA
0.8 V
V
±1 µA
0.4 V
1 µA
13 ms
ms
200 µs
20 µs
°C
2 _______________________________________________________________________________________


Part Number MAX1694
Description USB Current-Limited Switches with Fault Blanking
Maker Maxim
Total Page 8 Pages
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