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Part: MAX4790
Category:
Analog & Mixed-Signal Processing
-> Switches & Multiplexers
-> Analog Switches
Description: MAX4789, MAX4790, MAX4791, MAX4792, MAX4793, MAX4794 200mA/250mA/300mA Current-limit Switches
Company: Maxim Integrated Products
Datasheet: Download MAX4790 datasheet File size : 261 kB
Request For quote: Find where to buy MAX4790
Datasheet text preview:
19-2663; Rev 0; 10/02
200mA/250mA/300mA Current-Limit Switches
General Description
T h e MAX4789MAX4794 family of switches feature i n t e r n a l current limiting to prevent damage to host devices due to faulty load conditions. These analog switches have a low 0.2 on-resistance and operate from 2.3V to 5.5V input voltage range. They are available with guaranteed 200mA, 250mA, and 300mA current 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 latchoff 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 MAX4789MAX4794 are available in 6-pin thin QFN and tiny space-saving 4-pin SOT143 packages. The MAX4789/MAX4791/MAX4793 are also available in a tiny 5-pin SOT23 package. For lower current current-limiting switches, refer to the MAX4785MAX4788 data sheet.
Features
o Guaranteed Current Limit: 200mA, 250mA, 300mA o Thermal-Shutdown Protection o Reverse Current Protection o o o o 0.2 On-Resistance 14ms Guaranteed Blanking Time FLAG Function (MAX4789/MAX4791/MAX4793) 80µA Supply Current
MAX4789MAX4794
o 8µA Latch-Off Current (MAX4789/MAX4791/MAX4793) o 0.01µA Shutdown Current o 2.3V to 5.5V Supply Range o Undervoltage Lockout o Fast Current-Limit Response Time (5µs) o Tiny QFN and SOT23/SOT143 Packages
Ordering Information
PART TEMP RANGE PIN-PACKAGE TOP MARK KAFE AEAC ABO KAFF ABP
MAX4789EUS-T -40°C to +85°C 4 SOT143-4 MAX4789EUK-T -40°C to +85°C 5 SOT23-5 MAX4789ETT MAX4790ETT -40°C to +85°C 3 x 3 Thin QFN-EP* -40°C to +85°C 3 x 3 Thin QFN-EP MAX4790EUS-T -40°C to +85°C 4 SOT143-4
Applications
PDAs and Palmtop Devices Cell Phones GPS Systems Hand-Held Devices SDIO
*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
Pin Configurations
TOP VIEW
IN IN 1 GND 2 ON 3 5 OUT OUT 1 4 IN ON µP
MAX4789 MAX4791 MAX4793
MAX4789 MAX4794
4 FLAG GND 2 3 ON
MAX4789 MAX4791 MAX4793
GND
FLAG
TO SDIO PORT OUT
SOT23
SOT143
Pin Configurations continued at end of data sheet. ________________________________________________________________ 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.
200mA/250mA/300mA Current-Limit Switches MAX4789MAX4794
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 SOT143 (derate 4.0mW/°C above +70°C)..........320mW 5-Pin SOT23 (derate 7.1mW/°C above +70°C)...571mW 6-Pin Thin QFN (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 SYMBOL VIN IQ IL A T C H IS H D N 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 Reverse Current Limit ON Input Leakage Off Switch Leakage Undervoltage Lockout Undervoltage Lockout Hysteresis On-Resistance (Note 3) 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 4) Turn-Off Time (Note 4) VON from low to high; IOUT = 10mA, CL = 0.1µF VON from high to low; IOUT = 10mA, CL = 0.1µF 100 40 µs ns RON VIH VIL ISINK = 1mA (MAX4789/MAX4791/MAX4793) VIN = V FLAG = 5.5V (MAX4789/MAX4791/MAX4793) 150 15 TA = +25°C, IOUT = 100mA TA = -40°C to +85°C, IOUT = 100mA 2.0 0.8 0.4 1 UVLO MAX4791/MAX4792 MAX4793/MAX4794 VON = VIN or GND VON = 0V, VOUT = 0V Rising edge 1.8 100 0.2 0.4 0.5 -1 0.01 200 250 300 CONDITIONS MIN 2.3 80 TYP MAX 5.5 120 160 8 0.01 15 1 300 375 450 300 375 450 +1 1 2.2 µA µA V mV V V V µA °C °C mA mA UNITS V µA µA µA
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200mA/250mA/300mA 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 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 MAX4790/MAX4792/MAX4794 Figure 2 (Note 5) 98 MIN 14 5 420 TYP MAX 60 UNITS ms µs ms
MAX4789MAX4794
Note 1: Note 2: Note 3: Note 4:
All parts are 100% tested at +25°C. Limits across the full temperature range are guaranteed by design and correlation. Latch-off current does not include the current flowing into FLAG. RON specification for QFN package parts are guaranteed by design. 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 5: Retry time is typically 7 times the blanking time.
Typical Operating Characteristics
(VIN = 3.3V, TA = +25°C, unless otherwise noted.)
QUIESCENT SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4789 toc01
SUPPLY CURRENT vs. TEMPERATURE
MAX4789 toc02
LATCH-OFF CURRENT vs. TEMPERATURE
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 -40 VON = VIN
MAX4789 toc03
100 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 VON = VIN
120 VON = VIN 100 SUPPLY CURRENT (µA) 80 60 40 20 0 VIN = 3.3V VIN = 5V
LATCH-OFF (µA)
VIN = 5V
VIN = 3.3V
5.5
-40
-15
10
35
60
85
-15
10
35
60
85
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE
MAX4789 toc04
SHUTDOWN LEAKAGE CURRENT vs. TEMPERATURE
MAX4789 toc05
LATCH-OFF LEAKAGE CURRENT vs. TEMPERATURE
LATCH-OFF LEAKAGE CURRENT (nA)
MAX4789 toc06
100 SHUTDOWN SUPPLY CURRENT (nA)
10 SHUTDOWN LEAKAGE CURRENT (nA) VIN = 5V
100 10 1 0.1 0.01 0.001 VIN = 5V VIN = 3.3V
10 VCC = 5V 1
1
0.1
VIN = 3.3V
0.1
VCC = 3.3V
0.01
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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