MIC5013 Micrel, Inc. MIC5013 Protected High- or Low-Side MOSFET Driver General Description Features The MIC5013 is an 8-pin MOSFET driver with over-current 7V to 32V operation shutdown and a fault ag. It is designed to drive the gate of Less than 1A standby current in the OFF state an N-channel power MOSFET above the supply rail high-side Available in small outline SOIC packages power switch applications. The MIC5013 is compatible with Internal charge pump to drive the gate of an N-channel standard or current-sensing power MOSFETs in both high- power FET above supply and low-side driver topologies. Internal zener clamp for gate protection 60s typical turn-on time to 50% gate overdrive The MIC5013 charges a 1nF load in 60s typical and protects Programmable over-current sensing the MOSFET from over-current conditions. The current sense Dynamic current threshold for high in-rush loads trip point is fully programmable and a dynamic threshold Fault output pin indicates current faults allows high in-rush current loads to be started. A fault pin Implements high- or low-side switches indicates when the MIC5013 has turned off the FET due to excessive current. Applications Other members of the Micrel driver family include the MIC5011 minimum parts count driver and MIC5012 dual driver. Lamp drivers Relay and solenoid drivers Heater switching Power bus switching Motion control Typical Application Ordering Information Part Number Temperature Range Package Standard Pb-Free MIC5013BN MIC5013YN 40C to +85C 8-pin Plastic DIP MIC5013BM MIC5013YM 40C to +85C 8-pin SOIC + V =24V + 10F MIC5013 1 8 Control Input Input Fault R TH 2 7 Thresh V+ SR(V +100mV) 20k TRI P 3 6 R = Gate Sense S R I ( +100mV) V L TRI P 4 5 Source Gnd + S R R IRCZ44 V S R1= (S=2590, 100mV (SR+R ) R=11m) S 2200 SOU R C E R R = 1000 S E N S E S TH V TRI P 43 LOAD KELVIN For this example: R1 I =30A (trip current) 4.3k L V =100mV TRI P Figure 1. High-Side Driver with Current-Sensing MOSFET Protected under one or more of the following Micrel patents: Note: The MIC5013 is ESD sensitive. patent 4,951,101 patent 4,914,546 Micrel, Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 MIC5013 Micrel, Inc. Absolute Maximum Ratings (Note 1, 2) Operating Ratings (Notes 1, 2) + Input Voltage, Pin 1 10 to V Power Dissipation 1.25W Threshold Voltage, Pin 2 0.5 to +5V (Plastic DIP) 100C/W JA + Sense Voltage, Pin 3 10V to V (SOIC) 170C/W JA + Source Voltage, Pin 4 10V to V Ambient Temperature: B version 40C to +85C Current into Pin 4 50mA Storage Temperature 65C to +150C Gate Voltage, Pin 6 1V to 50V Lead Temperature 260C + Supply Voltage (V ), Pin 7 0.5V to 36V (Soldering, 10 seconds) + Fault Output Current, Pin 8 1mA to +1mA Supply Voltage (V ), Pin 7 7V to 32V high side Junction Temperature 150C 7V to 15V low side Pin Description (Refer to Figures 1 and 2) Pin Number Pin Name Pin Function 1 Input Resets current sense latch and turns on power MOSFET when taken above threshold (3.5V typical). Pin 1 requires <1A to switch. 2 Threshold Sets current sense trip voltage according to: 2200 = V TRI P R + 1000 TH where R to ground is 3.3k to 20k. Adding capacitor C increases the TH TH trip voltage at turn-on to 2V. Use C =10F for a 10ms turn-on time con- TH stant. 3 Sense The sense pin causes the current sense to trip when V is V above SENSE TRIP V . Pin 3 is used in conjunction with a current shunt in the source of SOURCE a 3 lead FET or a resistor R in the sense lead of a current sensing FET. S 4 Source Reference for the current sense voltage on pin 3 and return for the gate clamp zener. Connect to the load side of current shunt or kelvin lead of cur- rent sensing FET. Pins 3 and 4 can safely swing to 10V when turning off inductive loads. 5 Ground 6 Gate Drives and clamps the gate of the power FET. Pin 6 will be clamped to ap- proximately 0.7V by an internal diode when turning off inductive loads. + 7 V Supply pin must be decoupled to isolate from large transients caused by the power FET drain. 10F is recommended close to pins 7 and 5. 8 Fault Outputs status of protection circuit when pin 1 is high. Fault low indicates normal operation fault high indicates current sense tripped. Pin Conguration MIC5013 8 1 Fault Input 2 7 Thresh V+ 3 6 Sense Gate 4 5 Source Gnd MIC5013 2 July 2005