MAX4795MAX4798 19-2944 Rev 0 8/03 450mA/500mA Current-Limit Switches General Description Features The MAX4795MAX4798 family of switches feature inter- Guaranteed Current Limit: 450mA and 500mA nal current limiting to prevent damage to host devices Thermal-Shutdown Protection due to faulty load conditions. These analog switches Reverse-Current Protection have a low 0.2 on-resistance and operate from a 2.0V 0.2 On-Resistance to 4.5V input voltage range. They are available with guar- 14ms Guaranteed Blanking Time anteed 450mA and 500mA current limits, making them FLAG Function ideal for SDIO and other load-switching applications. Autoretry (MAX4796/MAX4798) When the switch is on and a load is connected to the 80A Supply Current port, a guaranteed blanking time of 14ms ensures the transient voltages settle down. If after this blanking time, 6A Latchoff Current the load current is greater than the current limit, the (MAX4795/MAX4797) MAX4795 and MAX4797 switches are turned off and 0.01A Shutdown Current FLAG is issued to the microprocessor. The switch can be +2V to +4.5V Supply Range turned on again by cycling the power or the ON input. Fast Current-Limit Response Time The MAX4796 and MAX4798 have an autoretry feature Tiny SOT23 and TDFN Packages where the switch turns off and issues a FLAG to the UL Certification Pending microprocessor after the blanking time and then contin- uously checks to see if the overload condition is pre- sent. The switch remains on after the overload condition Ordering Information disappears and FLAG deasserts. The MAX4795MAX4798 are available in tiny, space- PIN- TOP PART TEMP RANGE PACKAGE MARK saving, 5-pin SOT23 and 6-pin TDFN (3mm x 3mm) packages. MAX4795EUK-T -40C to +85C 5 SOT23-5 AEDI MAX4795ETT* 40C to +85C 6 TDFN-EP** Applications MAX4796EUK-T -40C to +85C 5 SOT23-5 AEDJ SDIO MAX4796ETT* -40C to +85C 6 TDFN-EP** PDAs and Palmtop Devices MAX4797EUK-T -40C to +85C 5 SOT23-5 AEDK Cell Phones MAX4797ETT* -40C to +85C 6 TDFN-EP** GPS Systems MAX4798EUK-T -40C to +85C 5 SOT23-5 AEDL Hand-Held Devices MAX4798ETT* -40C to +85C 6 TDFN-EP** *Future productcontact factory for availability. **EP = Exposed pad. Typical Operating Circuit Selector Guide appears at end of data sheet. +2.0V TO +4.5V Pin Configurations TOP VIEW IN ON IN15 OUT IN16 ON P FLAG MAX4795 MAX4795 MAX4795 MAX4796 GND 2 OUT 2 5 GND MAX4796 MAX4796 MAX4797 TO SDIO PORT MAX4797 MAX4797 MAX4798 OUT ON34MAX4798 FLAG N.C.34MAX4798 FLAG GND SOT23 TDFN Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.450mA/500mA Current-Limit Switches ABSOLUTE MAXIMUM RATINGS Operating Temperature Range ...........................-40C to +85C IN, ON, FLAG, OUT to GND.....................................-0.3V to +6V Junction Temperature......................................................+150C OUT Short Circuit to GND.................................Internally Limited Storage Temperature Range .............................-65C to +150C Continuous Power Dissipation (T = +70C) A Lead Temperature (soldering, 10s) .................................+300C 5-Pin SOT23 (derate 7.1mW/C above +70C)............571mW 6-Pin TDFN (derate 24.4mW/C above +70C) .........1951mW 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 (V = +2.0V to +4.5V, T = -40C to +85C, unless otherwise noted. Typical values are at V = 3.3V, T = +25C.) (Note 1) IN A IN A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Voltage V 2.0 4.5 V IN Quiescent Current I V = V , I = 0, switch on V = +3.3V 80 125 A Q ON IN OUT IN V = V , after an overcurrent ON IN Latch-Off Current I V = +3.3V 6 10 A LATCH IN fault (MAX4795/MAX4797) (Note 2) Shutdown Current I V = 0V 0.03 1 A SHDN ON MAX4795/MAX4796, V = 3.3V, V = GND 450 720 IN OUT Forward Current Limit mA MAX4797/MAX4798, V = 3.3V, V = GND 500 800 IN OUT MAX4795/MAX4796 720 Reverse Current Limit mA MAX4797/MAX4798 800 ON Input Leakage -1 +1 A Shutdown Forward Leakage V = 0V, V = 0V 0.01 1 A ON OUT Shutdown Reverse Leakage V = 0V, V = 2V, V = 4.5V 1 A ON IN OUT MAX4795/MAX4796, I = 100mA 0.2 0.4 LOAD On-Resistance (Note 3) R ON MAX4797/MAX4798, I = 100m A 0.18 0.36 L OAD V = +2V to +3.6V 1.4 IN ON Input Logic High Voltage V V IH V > 3.6V 2 IN ON Input Logic Low Voltage V 0.5 V IL FLAG Output Logic Low Voltage I = 1mA 0.4 V S IN K FLAG Output High Leakage V = V = V = 4.5V 1 A IN F LAG ON Current Thermal Shutdown 150 C Thermal-Shutdown Hysteresis 15 C DYNAMIC Turn-On Time V from l ow to hig h I = 10mA, C = 0.1F (N ote 4) 120 s ON OUT L Turn-Off Time V from hi g h to low I = 10mA, C = 0.1F (N ote 4) 100 ns ON OUT L Blanking Time t Overcurrent fault Figures 2, 3 14 60 ms BLANK Short-Circuit Current-Limit V = V , short circuit applied to OUT 5 s ON IN Response Time Retry Time t MAX4796/MAX4798, Figure 2 (Note 5) 210 900 ms RETRY Note 1: All parts are 100% tested at +25C. Electrical 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: TDFN packages are guaranteed by design. Note 4: 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 15 times the blanking time. 2 MAX4795MAX4798