MAX4793 Datasheet PDF - Maxim Integrated Products

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MAX4793
Maxim Integrated Products

Part Number MAX4793
Description (MAX4789 - MAX4794) 200mA/250mA/300mA Current-Limit Switches
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19-2663; Rev 2; 2/05
200mA/250mA/300mA Current-Limit Switches
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General Description
The MAX4789–MAX4794 family of switches feature
internal current limiting to prevent damage to host
devices due to faulty load conditions. These analog
switches have a low 0.2on-resistance and operate
from 2.3V to 5.5V input voltage range. They are avail-
able with guaranteed 200mA, 250mA, and 300mA cur-
rent limits, making them ideal for SDIO and other load
switching applications.
When the switch is on and a load is connected to the
port, a guaranteed blanking time of 14ms ensures that
the transient voltages settle down. If after this blanking
time the load current is greater than the current limit,
the MAX4789, MAX4791, and MAX4793 enter a latch-
off state where the switch is turned off and FLAG is
issued to the microprocessor. The switch can be turned
on again by cycling the power or the ON pin.
The MAX4790, MAX4792, and MAX4794 have an
autoretry feature where the switch turns off after the
blanking time and then continuously checks to see if
the overload condition is present. The switch remains
on after the overload condition disappears.
The MAX4789–MAX4794 are available in 6-pin 3mm x
3mm TDFN and tiny space-saving 4-pin SOT143 pack-
ages. The MAX4789/MAX4791/MAX4793 are also avail-
able in a tiny 5-pin SOT23 package. For lower current
current-limiting switches, refer to the MAX4785–MAX4788
data sheet.
Applications
PDAs and Palmtop Devices
Cell Phones
GPS Systems
Hand-Held Devices
SDIO
Pin Configurations
TOP VIEW
IN 1
GND 2
ON 3
MAX4789
MAX4791
MAX4793
5 OUT OUT 1
4 FLAG GND 2
MAX4789–
MAX4794
4 IN
3 ON
SOT23
SOT143
Pin Configurations continued at end of data sheet.
Features
Guaranteed Current Limit: 200mA, 250mA, 300mA
Thermal-Shutdown Protection
Reverse Current Protection
0.2On-Resistance
14ms Guaranteed Blanking Time
FLAG Function (MAX4789/MAX4791/MAX4793)
80µA Supply Current
8µA Latch-Off Current
(MAX4789/MAX4791/MAX4793)
0.01µA Shutdown Current
2.3V to 5.5V Supply Range
Undervoltage Lockout
Fast Current-Limit Response Time (5µs)
TDFN and SOT23/SOT143 Packages
Ordering Information
PART
TEMP RANGE PIN-PACKAGE TOP
MARK
MAX4789EUS-T -40°C to +85°C 4 SOT143-4
KAFE
MAX4789EUK-T -40°C to +85°C 5 SOT23-5
AEAC
MAX4789ETT
-40°C to +85°C 6 TDFN-EP*
ABO
MAX4790EUS-T -40°C to +85°C 4 SOT143-4
KAFF
MAX4790ETT
-40°C to +85°C 6 TDFN-EP
ABP
*EP = Exposed pad.
Ordering Information continued at end of data sheet.
Selector Guide appears at end of data sheet.
Typical Operating Circuit
2.3V TO 5.5V
IN
ON
MAX4789 FLAG
MAX4791
MAX4793
TO SDIO PORT
OUT
GND
µP
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.



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200mA/250mA/300mA Current-Limit Switches
www.daAtasBheSeOt4uL.cUomTE MAXIMUM RATINGS
IN, ON, FLAG, OUT to GND .....................................-0.3V to +6V
OUT Short Circuit to GND .................................Internally Limited
Continuous Power Dissipation (TA = +70°C)
4-Pin SOT143 (derate 4.0mW/°C above +70°C)..........320mW
5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW
6-Pin TDFN (derate 24.4mW/°C above +70°C).........1951.2mW
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
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 = 2.3V to 5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VIN = 3.3V, TA = +25°C.) (Note 1)
PARAMETER
Operating Voltage
Quiescent Current
Latch-Off Current (Note 2)
Shutdown Current
Forward Current Limit
Reverse Current Limit
ON Input Leakage
Off Switch Leakage
Undervoltage Lockout
Undervoltage Lockout Hysteresis
On-Resistance
ON Input Logic High Voltage
ON Input Logic Low Voltage
FLAG Output Logic Low Voltage
FLAG Output High Leakage
Current
Thermal Shutdown
Thermal-Shutdown Hysteresis
DYNAMIC
Turn-On Time (Note 3)
Turn-Off Time (Note 3)
SYMBOL
VIN
IQ
ILATCH
ISHDN
UVLO
CONDITIONS
VON = VIN, IOUT = 0, VIN = +2.3V to +5.0V
switch on
VIN = +5.0V to +5.5V
VON = VIN, after an overcurrent fault
(MAX4789/MAX4791/MAX4793)
VON = 0V
MAX4789/MAX4790
MAX4791/MAX4792
MAX4793/MAX4794
MAX4789/MAX4790
MAX4791/MAX4792
MAX4793/MAX4794
VON = VIN or GND
VON = 0V, VOUT = 0V
Rising edge
RON
VIH
VIL
TA = +25°C, IOUT = 100mA
TA = -40°C to +85°C, IOUT = 100mA
ISINK = 1mA (MAX4789/MAX4791/MAX4793)
VIN = V FLAG = 5.5V
(MAX4789/MAX4791/MAX4793)
VON from low to high; IOUT = 10mA,
CL = 0.1µF
VON from high to low; IOUT = 10mA,
CL = 0.1µF
MIN
2.3
200
250
300
-1
1.8
2.0
TYP
80
8
0.01
0.01
100
0.2
MAX
5.5
120
160
15
1
300
375
450
300
375
450
+1
1
2.2
0.4
0.5
0.8
0.4
1
150
15
100
40
UNITS
V
µA
µA
µA
mA
mA
µA
µA
V
mV
V
V
V
µA
°C
°C
µs
ns
2 _______________________________________________________________________________________



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200mA/250mA/300mA Current-Limit Switches
www.daEtasLhEeeCt4uT.cRomICAL CHARACTERISTICS (continued)
(VIN = 2.3V to 5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VIN = 3.3V, TA = +25°C.) (Note 1)
PARAMETER
Blanking Time
Short-Circuit Current-Limit
Response Time
Retry Time (Note 4)
SYMBOL
tBLANK
tRETRY
CONDITIONS
Overcurrent fault (Figures 2, 3)
VON = VIN = 3.3V, short circuit applied to
OUT
MAX4790/MAX4792/MAX4794 (Figure 2)
MIN TYP MAX UNITS
14 60 ms
5 µs
98 420 ms
Note 1: All parts are 100% tested at +25°C. Limits across the full temperature range are guaranteed by design and correlation.
Note 2: Latch-off current does not include the current flowing into FLAG.
Note 3: The on time is defined as the time taken for the current through the switch to go from 0mA to full load. The off-time is defined
as the time taken for the current through the switch to go from full load to 0mA.
Note 4: Retry time is typically 7 times the blanking time.
(VIN = 3.3V, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
QUIESCENT SUPPLY CURRENT
vs. SUPPLY VOLTAGE
100
90 VON = VIN
80
70
60
50
40
30
20
10
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0
SUPPLY VOLTAGE (V)
5.5
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
100
10
VCC = 5V
1
0.1 VCC = 3.3V
0.01
SUPPLY CURRENT
vs. TEMPERATURE
120
VON = VIN
100 VIN = 5V
80
VIN = 3.3V
60
40
20
0
-40
-15 10 35 60
TEMPERATURE (°C)
85
SHUTDOWN LEAKAGE CURRENT
vs. TEMPERATURE
10
VIN = 5V
1
0.1 VIN = 3.3V
0.01
0.001
LATCH-OFF CURRENT
vs. TEMPERATURE
15
14 VON = VIN
13
12
11
10 VIN = 5V
9
8
7
6 VIN = 3.3V
5
4
3
2
1
0
-40 -15 10 35 60
TEMPERATURE (°C)
85
LATCH-OFF LEAKAGE CURRENT
vs. TEMPERATURE
100
10
1
0.1
0.01
0.001
VIN = 5V
VIN = 3.3V
0.001
-40
-15 10 35 60
TEMPERATURE (°C)
85
0.0001
-40
-15 10 35 60
TEMPERATURE (°C)
85
0.0001
-40
-15 10 35 60
TEMPERATURE (°C)
85
_______________________________________________________________________________________ 3



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200mA/250mA/300mA Current-Limit Switches
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Typical Operating Characteristics (continued)
(VIN = 3.3V, TA = +25°C, unless otherwise noted.)
NORMALIZED ON-RESISTANCE
vs. TEMPERATURE
1.4
1.2
1.0
VCC = 5V
0.8
0.6
0.4
0.2
0
-40
1000
100
-15 10 35 60
TEMPERATURE (°C)
SWITCH TURN-ON/OFF TIMES
vs. TEMPERATURE
ON
85
OUTPUT CURRENT
vs. OUTPUT VOLTAGE
500
450
400
MAX4793/MAX4794
350
300 MAX4789/MAX4790
250 MAX4791/MAX4792
200
150
100
50
0
0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 3.3
VIN - VOUT (V)
FLAG-BLANKING TIMEOUT
vs. TEMPERATURE
50
45
10
VCC = 3.3V
VCC = 5V
1
40
35
0.1
0.01
0.001
-40
OFF
ILOAD = 10mA
-15 10 35 60
TEMPERATURE (°C)
85
30
25
20
-40
-15 10 35 60
TEMPERATURE (°C)
85
CURRENT-LIMIT RESPONSE
MAX4789 toc11
VIN = 3.3V
CIN = 1µF
COUT = 1µF
VIN
2V/div
VON
2V/div
CURRENT-LIMIT RESPONSE
MAX4789 toc12
VIN = VON
1V/div
40µs/div
IOUT
100mA/div
VIN = VON
CIN = 1µF
COUT = 1µF
20µs/div
IOUT
100mA/div
4 _______________________________________________________________________________________



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