MIC426/427/428 Dual 1.5A-Peak Low-Side MOSFET Driver Bipolar/CMOS/DMOS Process General Description The MIC426/427/428 are dual high speed drivers. A TTL/ CMOS input voltage level is translated into an output voltage level swing equal to the supply. The DMOS output will be within 25mV of ground or positive supply. Bipolar designs are capable of swinging only within 1 volt of the supply. The low impedance high current driver outputs will swing a 1000pF load 18V in 30ns. The unique current and voltage drive qualities make the MIC426/42 7/428 ideal power MOSFET drivers, line drivers, and dc-to-dc converter building blocks. Input logic signals may equal the power supply voltage. Input current is a low 1A making direct interface to CMOS/bipolar switch-mode power supply control integrated circuits possible as well as open-collector analog comparators. Features * High Speed Switching (CL = 1000pF) * High Peak Output Current .00........ cc eeeetreeeeeeeees 1.5A * High Output Voltage Swing ............ ee Vs 25mV GND + 25mV * Low Input Current (Logic O or 1) oo... eee 1pHA * Low Equivalent Input Capacitance (typ) .............. 6pF * TTL/CMOS Input Compatible * Available in Inverting & Non-Inverting Configurations * Wide Operating Supply Voltage ............... 4.5V to 18V * Low Power Consumption (Inputs LOW) oo... eee ee eeeeeeeeeeteeeeeeenees 0.4mA (Inputs High) ........... ce eeceeeeeeeeeeeenteeeeeeenaeees 8mA * Single Supply Operation * Low Output Impedance (typ) ...........eeeeeeeeeeeees 60 * Pin Out Equivalent to DS0026 & MMH0026 Pin Configuration MIC426 MIC426 MIC427 MIC427 MIC428 ne G] [3 ]NC nc Ei] nc[ INAP] ouTA * INA] INA [2] end B] 6 | Vz enp LB] end B] inBia] s|ouTs * iInBi4] InB Ea] Dual Dual Inverting- Inverting Noninverting Noninverting Functional Diagram Vs ft_ Integrated Component Count: e e ee 4 Resistors 4 Capacitors 0.6mA INVERTING 52 Transistors 0.1mA | I OUTA - INA 2ka I I ie | | KH NONINVERTING 4 0.6mA INVERTING 0.1mA | i , I OUTB INB 2kQ | 1 t ie | | KH NONINVERTING 4 Ground Unused Inputs 1997 5-9MIC426/427/428 Quiescent power supply currentis 8mA maximum. The MIC426 requires 1/5 the current of the pin compatible bipolar DS0026 device. This is important in dc-to-dc converter applications with power efficiency constraints and high frequency switch mode power supply applications. Quiescent current is typically Ordering Information 6mA when driving a 1000pF load 18V at 100kHz. Micrel The inverting MIC 426 driver is pin compatible with the bipolar DS0026 and MMH0026 devices. The MIC 427 is non-inverting; the MIC428 contains an inverting and non-inverting driver. Part Number Temperature Range Package Configuration MIC426CM 0C to +70C 8-pin SOIC Dual Inverting MIC426BM 40C to +85C MIC426CN 0C to +70C 8-pin plastic DIP Dual Inverting MIC426BN 40C to +85C MIC426AJ 55C to +125C 8-pin CerDIP Dual Inverting 5962-8850301PA' 55C to +125C 5962-8850302PA? 55C to +125C 8-pin CerDIP Dual Noninverting 5962-8850303PA 55C to +125C 8-pin CerDIP Noninverting + Inverting ' Standard Military Drawing number for MIC426AJBQ ? Standard Military Drawing number for MIC427AJBQ Standard Military Drawing number for MIC428AJBQ Absolute Maximum Ratings (Notes 1, 2, and 3) If Military/Aerospace specified devices are required, contact Micrel for availability and specifications. Supply Voltage Input Voltage Any Terminal Maximum Chip Temperature Storage Temperature Lead Temperature (10 sec) Package Thermal Resistance CerDIP Rey-a (C/W) CerDIP Rey-c (C/W) PDIP Ray-a (C/W) PDIP Ray-c (C/W) SOIC RoJ-a SOIC Re-c ( ( C/W) C/W) Operating Temperature Range C Version B Version A Version 20V Vs + 0.3V to GND 0.3V 150C 65C to 150C 300C 100 50 130 42 120 75 0C to +70C 40C to +85C 55C to +125C 5-10 1997MIC426/427/428 Micrel Electrical Characteristics: T, = 25C with 4.5V < Vs < 18V unless otherwise specified. No. | Symbol Parameter Conditions Min Typ Max Units INPUT 1 VIH Logic 1 Input Voltage 2.4 1.4 Vv 2 VIL Logic 0 Input Voltage 1.4 0.8 Vv 3 lin Input Current O<VIN<Vs -1 1 pA OUTPUT 4 VOH High Output Voltage Vs-0.025 Vv 5 VoL Low Output Voltage 0.025 Vv 6 Ro Output Resistance VIN = 0.8V 6 15 Q louT = 10mA, Vs = 18V 7 Ro Output Resistance VIN =2.4V 6 10 Q louT = 10mA, Vs = 18V 8 IPK Peak Output Current 1.5 A SWITCHING TIM 9 TR Rise Time Test Figures 1, 2 18 30 ns 10 TF Fall Time Test Figures 1, 2 15 20 ns 11 Tp1 Delay Time Test Figures 1, 2 17 40 ns 12 Tpe Delay Time Test Figures 1, 2 23 75 ns POWER SUPPLY 13 Is Power Supply Current VIN = 3.0V (Both Inputs) 1.4 8.0 mA 14 Is Power Supply Current VIN = 0.0V (Both Inputs) 0.18 0.4 mA Electrical Characteristics: Over operating temperature range with 4.5V < Vs < 18V unless otherwise specified. No. | Symbol Parameter Conditions Min Typ Max Units INPUT 1 VIH Logic 1 Input Voltage 2.4 1.5 Vv 2 VIL Logic 0 Input Voltage 1.0 0.8 Vv 3 lIN Input Current O<VINSVs -10 10 pA 1997 5-11MIC426/427/428 Micrel Electrical Characteristics: Over operating temperature range with 4.5V < Vs < 18V unless otherwise specified (Continued). No. Symbol Parameter Conditions Min Typ Max Units OUTPUT 4 VOH High Output Voltage Vs-0.025 Vv 5 VOL Low Output Voltage 0.025 Vv 6 Ro Output Resistance VIN =0.8V 8 20 Q louT = 10mA, Vs = 18V 7 Ro Output Resistance VIN =2.4V 10 15 Q louT = 10mA, Vs = 18V SWITCHING TIME 8 TR Rise Time Test Figures 1, 2 20 60 ns 9 TF Fall Time Test Figures 1, 2 29 40 ns 10 Tp1 Delay Time Test Figures 1, 2 19 60 ns 11 Tpe Delay Time Test Figures 1, 2 27 120 ns POWER SUPPLY 12 Is Power Supply Current VIN = 3.0V (Both Inputs) 1.5 12.0 mA 13 Is Power Supply Current VIN = 0.0V (Both Inputs) 0.19 0.6 mA Note 1: Functional operation above the absolute maximum stress ratings is not implied. Note 2: Static sensitive device (above 2kV). Unused devices must be stored in conductive material to protect devices from static discharge and static fields. Note 3: Switching times guaranteed by design. 5-12 1997MIC426/427/428 Switching Time Test Circuits Vs = 18V r oe AF 2 7 INA |D>op-4-0 OUTA 1000pF micaze | _[_ 4 5 INB p|d>o84-0 OUTB 1000pF LY t I INPUT OV Vs 90% OUTPUT 10% OV Figure 1. Inverting Driver Switching Time Vg = 18V F oie EF 2 7 INA [>a OUTA 1000pF LH mica27 | [_ 4 5 INB >> OUTB = 1000pF Sv INPUT 10% - OV Vs 90% OUTPUT 10% OV Figure 2. Noninverting Driver Switching Time Micrel 1997 5-13MIC426/427/428 Typical Characteristic Curves Time (ns) 35 30 25 20 15 Time (ns) 10 5 0 -75 -50 -25 0 25 50 75 100125 150 30 20 10 SUPPLY CURRENT (mA) Rise and Fall Time vs. Supply Voltage Cc L Ts = 1000pF = 25C 5 10 15 SUPPLY VOLTAGE (V) 20 Delay Time vs. Temperature Cc L Vs 1000pF 18V TEMPERATURE (C) Supply Current vs. Frequency " Lc TTT T rq 25C 1000pF Vg = 18V / Ln | | 10 100 FREQUENCY (kHz) 1000 Time (ns) | Vs Mur |) SUPPLY CURRENT (mA) Delay Time vs. Supply Voltage = 1000pF = 25C L 0 5 10 15 SUPPLY VOLTAGE (V) 20 Supply Current vs. Capacitive Load Ty = 25C 400kHz Vg = 18V | 20kHz 10 100 1000 CAPACITIVE LOAD (pF) 10000 High Output vs. Current 1.20 T A= 25C Vo = 5V .96 72 .48 24 .00 0 10 20 30 40 50 60 70 80 90 100 CURRENT SOURCED (mA) Micrel Rise and Fall Time vs. Temperature 40 C, = 1000pF Vg = 18V 30 a o 20 k- 10 -75 -50 -25 0 25 50 75100125150 TEMPERATURE (C) Rise and Fall Time vs. Capacitive Load 1k Ta = 25C Vg = 18V 100 a oO E =~ 40 1 10 100 1000 10000 CAPACITIVE LOAD (pF) Low Output vs. Current 1.20 Ty, = 25C Vs = 5V S 96 Ww < F 12 Oo > 5 48 o 5 .24 .00 0 10 20 30 40 50 60 70 80 90 100 CURRENT SUNK (mA) 5-14 1997MIC 426/427/428 Micrel! Typical Characteristic Curves (Continued) Quiescent Power Supply Quiescent Power Supply ae 5 Current vs. Supply Voltage 400 Current vs. Supply Voltage Package Power Dissipation 1250 - - eK 20 300 w 1000 = = Q Zz SOIC E 5 200 <0 ~~ i 1.5 w Qe 750 cc " a 450 - c& SS 2 1.0 NO LOAD 4 NO LOAD 2 500 pres: 7 BOTH INPUTS LOGIC "1" 1 100|_ ___ BOTH INPUTS LoGic "0" CERDIP ao ao _ o Ta = 25C oO Ta = 25C <u _) 2 0.5 B 50 5 250 0 0 0 0 5 10 15 20 0 5 10 15 20 25 50 75 100 125 150 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) AMBIENT TEMPERATURE (C) Supply Bypassing Charging and discharging large capacitive loads quickly requires large currents. For example, changing a 1000pF load 18 volts in 25ns requires a 0.8A current from the device power supply. To guarantee low supply impedance over a wide frequency range, a parallel capacitor combination is recommended for supply bypassing. Low inductance ceramic disk capacitors with short lead lengths (< 0.5 inch) should be used. A 4.7uF solid tantalum capacitor in parallel with one or two 0.1uF ceramic disk capacitors normally provides adequate bypassing. Grounding The MIC426 and MIC428 contain inverting drivers. Ground potential drops developed in common ground impedances from input to output will appear as negative feedback and degrade switching speed characteristics. Individual ground returns for the input and output circuits or a ground plane should be used. Input Stage The input voltage level changes the no load or quiescent supply current. The Nchannel MOSFET input stage transistor drives a 2.5mA current source load. With a logic 1 input, the maximum quiescent supply current is 8mA. Logic O input level signals reduce quiescent current to 400uA maximum. Minimum power dissipation occurs for logic O inputs for the MIC426/427/428; unused driver inputs must be grounded or tied to the positive supply. The drivers are designed with 100mV of hysteresis. This provides clean transitions and minimizes output stage current spiking when changing states. Input voltage thresholds are approximately 1.5V making the device TTL compatible over the 4.5V to 18V operating supply range. Input current is less than 1pA over this range. The MIC426/427/428 may be directly driven by the TL494, $G1526/1527, SG1524, SE5560 and similar switch-mode power supply integrated circuits. Power Dissipation The supply current vs. frequency and supply current vs. capacitive load characteristic curves will aid in performing power dissipation calculations. The MIC426 CMOS drivers have greatly reduced quiescent dc power consumption. Maximum quiescent current is 8mA compared to the DS0026 40mA specification. For a 15V supply, power dissipation is typically 40mW. Two other power dissipation components are: * Output stage ac and dc load power. * Transition state power. Output stage power is: Po =Ppc+Pac ps = Vo (Ipc) + f CL Vs Vo = de output voltage Ipc = de output load current f = Switching frequency Vs = Supply voltage Where: In power MOSFET drive applications, the Ppc term is negligible. MOSFET power transistors are high impedance, capacitive input devices. In applications where resistive loads orrelays are driven, the Ppc component will normally dominate. The magnitude of Pac is readily estimated for several cases: A. 1. f= 200kHz B. 1. f= 200kHz 2. CL = 1000pF 2. CL = 1000pF 3. Vg = 18V 3. Vg = 15V 4. Pac = 65mW 4. Pac = 45mW During output level state changes, a current surge will flow through the series connected N- and P- channel output MOSFETs as one device is turning ON while the other is 1997 5-15MIC426/427/428 Micrel turning OFF. The current spike flows only during output transitions. The input levels should not be maintained between the logic O and logic 1 levels. Unused driver inputs must be tied to ground and not be allowed to float. Average power dissipation will be reduced by minimizing input rise times. As shown in the characteristic curves, average supply current is frequency dependent. Voltage Doubler Voltage Inverter 1N4001 | 47 wr 1N4001 + 1N4001 VOUT 30 29 28 27 26 Your) 25 24 23 22 21 -5.0 -6.0 -7.0 -8.0 Vout ) OUTPUT VOLTAGE vs LOAD CURRENT 10 20 30 40 50 60 70 80 90 100 lout (mA) OUTPUT VOLTAGE vs LOAD CURRENT | La a" | La Pal 10 20 30 40 50 60 70 80 90 100 lout (mA) 5-16 1997