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Part: MAX4786EXS
Category:
Analog & Mixed-Signal Processing
-> Switches & Multiplexers
-> Analog Switches
Description: MAX4785, MAX4786, MAX4787, MAX4788 50mA/100mA Current-limit Switches
Company: Maxim Integrated Products
Datasheet: Download MAX4786EXS datasheet File size : 261 kB
Request For quote: Find where to buy MAX4786EXS
Datasheet text preview:
19-2664; Rev 1; 4/03
50mA/100mA Current-Limit Switches
General Description
The MAX4785MAX4788 family of switches feature internal current limiting to prevent host devices from being damaged due to faulty load conditions. These analog switches have a low 0.7 on-resistance and operate from a 2.3V to 5.5V input voltage range. They are available with guaranteed 50mA and 100mA current limits, making them ideal for 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, t h e MAX4785 and MAX4787 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 MAX4786 and MAX4788 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. T h e MAX4785 and MAX4787 are available in a tiny s p a c e - s a v i n g 4-pin or 5-pin SC70 package. The MAX4786 and MAX4788 are available only in the 4-pin S C 7 0 package. For higher current current-limiting s w i t c h e s , refer to the MAX4789MAX4794 and MAX1693 data sheets. o Thermal-Shutdown Protection o Reverse-Current Protection o 0.7 On-Resistance o 14ms Guaranteed Blanking Time o FLAG Function (MAX4785/MAX4787) o 65µA Supply Current o 8µA Latch-Off Current (MAX4785/MAX4787) o 0.01µA Shutdown Current o 2.3V to 5.5V Supply Range o Undervoltage Lockout o Fast Current-Limit Response Time o Tiny SC70 Package
Features
o Guaranteed Current Limit: 50mA, 100mA
MAX4785MAX4788
Ordering Information
PART MAX4785EXS-T MAX4785EXK-T MAX4786EXS-T MAX4787EXS-T TEMP RANGE -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C PINPACKAGE 4 SC70-4 5 SC70-5 4 SC70-4 4 SC70-4 5 SC70-5 4 SC70-4 TOP MARK AGE ADL AGF AGG AND AGH
Applications
PDAs and Palmtop Devices Cell Phones GPS Systems Hand-Held Devices
MAX4787EXK-T MAX4788EXS-T
Selector Guide appears at end of data sheet.
Typical Operating Circuit
2.3V TO 5.5V
Pin Configurations
TOP VIEW
ON OUT 1 GND 2 FLAG 3 5 IN OUT 1 4 IN IN µP
MAX4785 MAX4787
4 ON GND 2
MAX4785 MAX4788
3 ON
MAX4785 MAX4787
FLAG
TO EXTERNAL PORT OUT GND
SC70
SC70 1
________________________________________________________________ Maxim Integrated Products
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.
50mA/100mA Current-Limit Switches MAX4785MAX4788
ABSOLUTE 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 SC70 (derate 3.1mW/°C above +70°C) .....245mW 5-Pin SC70 (derate 3.1mW/°C above +70°C) .....247mW 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) ON from low to high; IOUT = 10mA, CL = 0.1µF ON from high to low; IOUT = 10mA, CL = 0.1µF 50 30 µs ns RON VIH VIL ISINK = 1mA (MAX4785/MAX4787) VIN = V F LAG = 5.5V (MAX4785/MAX4787) 150 15 TA = +25°C, IOUT = 20mA TA = -40°C to +85°C, IOUT = 20mA 2.0 0.8 0.4 1 UVLO SYMBOL VIN IQ IL A T C H IS H D N IF W D IREV VON = VIN, IOUT = 0, VIN = 2.3V to 5.0V switch on VIN = 5.0V to 5.5V VON = VIN, after an overcurrent fault (MAX4785/MAX4787) VON = 0V MAX4785/MAX4786 MAX4787/MAX4788 MAX4785/MAX4786 MAX4787/MAX4788 VON = VIN or GND VON = 0V, VOUT = 0V Rising edge 1.8 100 0.7 1 1.3 -1 0.01 50 100 CONDITIONS MIN 2.3 65 TYP MAX 5.5 100 120 8 0.01 15 1 120 240 120 240 +1 1 2.2 UNITS V µA µA µA mA mA µA µA V mV V V V µA °C °C
2
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50mA/100mA Current-Limit Switches
ELECTRICAL 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) tR E T R Y SYMBOL tB L A N K CONDITIONS Overcurrent fault, Figures 2, 3 VON = VIN = 3.3V, short circuit applied to OUT MAX4786/MAX4788: overcurrent fault, Figure 2 98 MIN 14 5 420 TYP MAX 60 UNITS ms µs ms
MAX4785MAX4788
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 7x the blanking time.
Typical Operating Characteristics
(VIN = 3.3V, TA = +25°C, unless otherwise noted.)
QUIESCENT SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4785-01
SUPPLY CURRENT vs. TEMPERATURE
MAX4785-02
LATCH-OFF CURRENT vs. TEMPERATURE
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 -40 VON = VIN
MAX4785 toc03
90 80 SUPPLY CURRENT (µA) 70 60 50 40 30 20 10 0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 VON = VIN
90 80 SUPPLY CURRENT (µA) 70 VIN = 3.3V VON = VIN VIN = 5V
50 40 30 20 10 0
LATCH-OFF (µA)
60
VIN = 5V
VIN = 3.3V
6.0
-40
-15
10
35
60
85
-15
10
35
60
85
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE
MAX4785-04
SHUTDOWN LEAKAGE CURRENT vs. TEMPERATURE
MAX4785-05
LATCH-OFF LEAKAGE CURRENT vs. TEMPERATURE
LATCH-OFF LEAKAGE CURRENT (nA)
MAX4785 toc06
10 SHUTDOWN SUPPLY CURRENT (nA)
10 SHUTDOWN LEAKAGE CURRENT (nA)
100 10 1 0.1 0.01 0.001 VIN = 5V VIN = 3.3V
1
1
VIN = 5V
0.1
0.1
0.01
VIN = 3.3V
0.01
0.001
0.001 -40 -15 10 35 60 85 TEMPERATURE (°C)
0.0001 -40
0.0001 -15 10 35 60 85 -40 -15 10 35 60 85 TEMPERATURE (°C) TEMPERATURE (°C)
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