MIC5011 Micrel, Inc. MIC5011 Minimum Parts High- or Low-Side MOSFET Driver General Description Features The MIC5011 is the minimum parts count member of the 4.75V to 32V operation Micrel MIC501X driver family. These ICs are designed to Less than 1A standby current in the off state drive the gate of an N-channel power MOSFET above the Internal charge pump to drive the gate of an N-channel supply rail in high-side power switch applications. The 8-pin power FET above supply MIC5011 is extremely easy to use, requiring only a power Available in small outline SOIC packages FET and nominal supply decoupling to implement either a Internal zener clamp for gate protection high- or low-side switch. Minimum external parts count Can be used to boost drive to low-side power FETs The MIC5011 charges a 1nF load in 60s typical with no operating on logic supplies external components. Faster switching is achieved by add- 25s typical turn-on time with optional external ing two 1nF charge pump capacitors. Operation down to capacitors 4.75V allows the MIC5011 to drive standard MOSFETs in Implements high- or low-side drivers 5V low-side applications by boosting the gate voltage above the logic supply. In addition, multiple paralleled MOSFETs can be driven by a single MIC5011 for ultra-high current Applications applications. Lamp drivers Other members of the Micrel driver family include the Relay and solenoid drivers MIC5013 protected 8-pin driver. Heater switching Power bus switching For new designs, Micrel recommends the pin-compatible MIC5014 MOSFET driver. Typical Applications Ordering Information Part Number Temperature Range Package 14.4V Standard Pb-Free ON MIC5011BN MIC5011YN 40C to +85C 8-pin Plastic + MIC5011 10F DIP 1 8 V+ C1 MIC5011BM MIC5011YM 40C to +85C 8-pin SOIC 2 7 Control Input Input Com 3 6 Source C2 4 5 Gnd Gate IRF531 OFF 6014 Figure 1. High Side Driver Note: The MIC5011 is ESD sensitive. 5V 48V ON 10F + MIC5011 1 8 V+ C1 2 7 100W Input Com Control Input Heater 3 6 Source C2 4 5 Gnd Gate IRF530 Protected under one or more of the following Micrel patents: OFF patent 4,951,101 patent 4,914,546 Figure 2. Low Side Driver Micrel, Inc. 2180 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 MIC5011 Micrel, Inc. Absolute Maximum Ratings (Note 1, 2) Operating Ratings (Notes 1, 2) + Supply Voltage (V ), Pin 1 0.5V to 36V Power Dissipation 1.25W + Input Voltage, Pin 2 10V to V (Plastic DIP) 100C/W JA + Source Voltage, Pin 3 10V to V (SOIC) 170C/W JA Current into Pin 3 50mA Ambient Temperature: B version 40C to +85C Gate Voltage, Pin 5 1V to 50V Storage Temperature 65C to +150C Junction Temperature 150C Lead Temperature 260C (Soldering, 10 seconds) + Supply Voltage (V ), Pin 1 4.75V to 32V high side 4.75V to 15V low side Pin Description (Refer to Typical Applications) Pin Number Pin Name Pin Function + 1 V Supply must be decoupled to isolate from large transients caused by the power FET drain. 10F is recommended close to pins 1 and 4. 2 Input Turns on power MOSFET when taken above threshold (3.5V typical). Re- quires <1 A to switch. 3 Source Connects to source lead of power FET and is the return for the gate clamp zener. Can safely swing to 10V when turning off inductive loads. 4 Ground 5 Gate Drives and clamps the gate of the power FET. Will be clamped to approxi- mately 0.7V by an internal diode when turning off inductive loads. 6, 7, 8 C2, Com, C1 Optional 1nF capacitors reduce gate turn-on time C2 has dominant effect. Pin Conguration MIC5011 1 8 C1 V+ 2 7 Com Input 3 6 Source C2 4 5 Gnd Gate MIC5011 2 July 2005