Maxim MAX1694EUB, MAX1693EUB Datasheet
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General Description
The MAX1693/MAX1694 are current-limited, 60mΩ
switches with built-in fault blanking. Their accurate preset current limit of 0.7A to 1.0A makes them ideally suited 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 internal current limit has been reached. A 10ms fault-blanking 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 causes 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 overcurrent 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 thermaloverload protection limits power dissipation and junction 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.
Features
♦ Accurate Current Limit (0.7A min, 1.0A max)
♦ Guaranteed 0.75A Short-Circuit Protection
♦ 10ms Internal Fault-Blanking Timeout
♦ No Fault Signal During Power-Up
♦ Latched FAULT Output Turns Off Power Switch
(MAX1694)
♦ Thermal Shutdown Protection
♦ +2.7V to +5.5V Supply Range
♦ 14µA Supply Current
♦ Small 10-Pin µMAX Package
♦ UL Recognition Pending
Applications
USB Ports and Hubs
Notebook Computers
Portable Equipment
Docking Stations
Hot Plug-In Power Supplies
Battery-Charger Circuits
MAX1693/MAX1694
USB Current-Limited Switches
with Fault Blanking
________________________________________________________________
Maxim Integrated Products
1
MAX1693
MAX1694
IN OUTPUTOUT
INPUT
+2.7V TO +5.5V
FAULT
ON
ON
OFF
GND
1
2
3
4
5
10
9
8
7
6
OUT
IN
OUT
FAULTOUT
IN
OUT
IN
MAX1693
MAX1694
µMAX
TOP VIEW
GNDON
Typical Operating Circuit
19-1518; Rev 0; 9/99
PART
MAX1693EUB
MAX1694EUB
-40°C to +85°C
-40°C to +85°C
TEMP. RANGE PIN-PACKAGE
10 µMAX
10 µMAX
Pin Configuration
Ordering Information
MAX1693/MAX1694
USB Current-Limited Switches
with Fault Blanking
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= +5V, TA= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +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.
IN, ON, FAULT to GND.............................................-0.3V to +6V
OUT to GND ................................................-0.3V to (V
IN
+ 0.3V)
Maximum Continuous Switch Current .....1.2A (internally limited)
OUT Short Circuit to GND ..........................................Continuous
Continuous Power Dissipation (T
A
= +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
VON= GND, I
OUT
= 0
I
SINK
= 1mA, VIN= 3V
VON= VINor GND
(Note 1)
VIN= 2.7V to 3.6V
VIN= 2.7V to 5.5V
TA= +25°C
VON= VIN= V
OUT
= 5.5V
Rising edge, 100mV hysteresis
VON= VIN,
V
IN
= 5.5V,
V
OUT
= GND
OUT shorted to GND, MAX1693 only (Note 2)
CONDITIONS
V0.4V
OL
FAULT Output Logic Low
Voltage
µA±1
ON Input Leakage
V
2
V
IH
ON Input Logic High Voltage
V0.8V
IL
ON Input Logic Low Voltage
mA500 700I
SC
Continuous Short-Circuit
Current Limit
µA
35
I
Q
14 25
V2.7 5.5V
IN
Operating Voltage
Quiescent Current
mA700 850 1000I
LIMIT
Current Limit
mΩ
72 150
R
ON
On-Resistance
125
60 90
µA0.001 1Off-Supply Current
V2.0 2.6UVLOUndervoltage Lockout
0.01 2
µA
15
Off-Switch Leakage
UNITSMIN TYP MAXSYMBOLPARAMETER
Timer not running
Timer running
TA= +25°C
TA= 0°C to +85°C
VIN= 4.4V to 5.5V
VIN= 4.4V to 5.5V
VIN= 3V
VIN= V
FAULT
= 5.5V µA1
FAULT Output High Leakage
Current
From overcurrent condition to FAULT assertion
ms71013t
FB
Fault-Blanking Timeout Period
VIN= 5V, C
OUT
= 150µF, R
L
= 15Ω,
from ON driven low to 50% full V
OUT
ms1Start-Up Time
I
LOAD
= 400mA µs3620t
OFF
Switch Turn-Off Time
I
LOAD
= 400mA µs80 200t
ON
Switch Turn-On Time
°C165Thermal Shutdown Threshold
TA= 0°C to +85°C
VIN= 3.7V to 5.5V 2.4
MAX1693/MAX1694
USB Current-Limited Switches
with Fault Blanking
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS
(V
IN
= +5V, TA= -40°C to +85°C, unless otherwise noted.) (Note 3)
VIN= V
FAULT
= 5.5V µA1
VIN= 4.4V to 5.5V
FAULT Output High Leakage
Current
VON= GND, I
OUT
= 0, timer not running
From overcurrent condition to FAULT assertion
I
SINK
= 1mA, VIN= 3V
VON= VINor GND
(Note 1)
VIN= 3V to 3.6V
VIN= 3V to 5.5V
ms
VON= VIN= V
OUT
= 5.5V
Rising edge, 100mV hysteresis
VIN= 3V
VON= V
IN
= 5.5V, V
OUT
= GND
OUT shorted to GND, MAX1693 only (Note 2)
CONDITIONS
614t
FB
Fault-Blanking Timeout Period
I
LOAD
= 400mA µs120t
OFF
Switch Turn-Off Time
I
LOAD
= 400mA µs200t
ON
Switch Turn-On Time
V0.4V
OL
FAULT Output Logic Low
Voltage
µA±1
ON Input Leakage
V
2
V
IH
ON Input Logic High Voltage
V0.8V
IL
ON Input Logic Low Voltage
mA750
Continuous Short-Circuit
Current Limit
µAI
Q
25
V3 5.5V
IN
Operating Voltage
Quiescent Current
mA640 1060I
LIMIT
Current Limit
150
125
µA2Off-Supply Current
V2.0 2.9UVLOUndervoltage Lockout
µA15Off-Switch Leakage
UNITSMIN TYP MAXSYMBOLPARAMETER
R
ON
On-Resistance mΩ
Note 1: MAX1693’s current limit is tested by forcing V
OUT
to 4.5V. The MAX1694’s current limit is tested by increasing the output cur-
rent until the switch is latched off.
Note 2: This specification applies to the MAX1693 only. The MAX1694 latches the switch off under a sustained (>10ms) short-
circuit condition.
Note 3: Specifications to -40°C are guaranteed by design, not production tested.
VIN= 3.7V to 5.5V 2.4
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