MIC426/427/428 Dual 1.5A Low-Side MOSFET Driver Bipolar/CMOS/DMOS Process General Description The MIC426/427/428 are dual high speed drivers. A TTL/ CMOS input voitage level is translated into an output voltage level swing equalling 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 MIC426/427/428 ideal power MOSFET drivers, line drivers and DC to DC converter building blocks. Input logic signals may equal the power supply voltage. Input currentis alow 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... ee High Output Voltage Swing .........- Low Input Current (Logic 0 or 1) oes Low Equivalent Input Capacitance (typ).............. TTL/CMOS Input Compatible Available in Inverting & Non-Inverting Configurations Wide Operating Supply Voltage 0.0.0... 4.5V to 18V Low Power Consumption (Inputs LOW) oo... cece eeceenetn eter eeerenetees 0.4mA (Inputs HIgh) occ eee ene ceetneeeeeneeeeeereeenens 8mA Single Supply Operation Low Output Impedance (typ)... eee eeneeeseeees 6Q Pin Out Equivalent to DS0026 & MMH0026 Pin Configuration DUAL DUAL 2 > 7 NC 2 S 7 MIC426 INA MIC427 GND Do NB [4] 4 S 5 INVERTING NON-INVERTING Functional Diagram Integrated Component Count: 4 Resistors 4 Capacitors 52 Transistors Vg 0.6mA 0.1mA INVERTING 2kQ INPUT 1 NON-INVERTING Functional Diagram for One Driver (Two Drivers per PackageGround Unused Drivers) 5-5MIC426/427/428 Micrel 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 currentis typically Ordering Information 6mA when driving a 1000pF load 18V at 100kHz. 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 MIC426AJBQ* 5C to +125C SMD#5962-8850301PX MIC426CY _ CHIP Dual Inverting MIC427CM 0C to +70C 8-pin SOIC Dual Non-Inverting MIC427BM 40C to +85C MIC427CN 0C to +70C 8-pin plastic DIP Dual Non-Inverting MIC427BN 40C to +85C MIC427AJ 55C to +125C 8-pin CerDIP Dual Non-Inverting MIC427AJBQ* 55C to +125C SMD#5962-8850302PX MIC427CY _ CHIP Dual Non-Inverting MIC428CM 0C to +70C 8-pin SOIC Non-Inv. & Inverting MIC428BM 40C to +85C MIC428CN 0C to +70C 8-pin plastic DIP Non-Inv. & Inverting MIC428BN 40C to +85C MIC428AJ ~55C to +125C 8-pin CerDIP Non-Inv. & Inverting MIC428AJBQ* 55C to +125C SMD#5962-8850303PX MIC428CY _ CHIP Non-Inv. & Inverting * AJB indicates units screen to MIL-STD 883, Method 5004, Military Drawing) number for ordering. condition B, and burned-in for 1 week. Use SMD (Standard Absolute Maximum Ratings (Notes 1, 2, and 3) If Military/Aerospace specified devices are requi 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 Roy.c (C/W) PDIP Ray.a (C/W) PDIP Rey.c (C/W) SOIC Rag-4 (C/W) SOIC Rej-c (C/W) Operating Temperature Range C Version B Version A Version red, contact Micrel for 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 +125CMIC426/427/428 Micrel MiC426/427/428 Electrical Characteristics: 1, = 25C with 4.5V < Vg < 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 1.1 0.8 v 3 lin Input Current O<VinsVs -1 1 HA OUTPUT 4 VOH High Output Voltage Vg-0.025 Vv 5 VoL Low Output Voltage 0.025 v 6 Ro Output Resistance Vin = 0.8V 6 15 Q lout = 10mA, Vg = 18V 7 Ro Output Resistance Vin =2.4V 6 10 Q lout = 10mA, Vg = 18V 8 IpK Peak Output Current 1.5 A SWITCHING TIME 9 TR Rise Time Test Figures 1, 2 18 30 ns 10 Tr Fall Time Test Figures 1, 2 16 20 ns 11 Tp} Delay Tlme Test Figures 1,2 17 40 ns 12 Tp2 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 MIC426/427/428 Electrical Characteristics: Over operating temperature range with 4.5V < Vs < 18V unless otherwise specified. No. | Symbo! Parameter Conditions Min Typ Max Units INPUT 1 ViH Logic 1 Input Voltage 2.4 1.5 Vv 2 Vit Logic 0 Input Voltage 1.0 0.8 Vv 3 lin Input Current OS VINE Vs -10 10 pA 5-7MIC426/427/428 Micrel MIC426/427/428 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 Tr Fall Time Test Figures 1, 2 29 40 ns 10 Toi Delay Time Test Figures 1, 2 19 60 ns 14 Toe 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. 5-8MIC426/427/428 Micrel Switching Time Test Circuits Vg= 18V ne eo sue 6 = = 2 7 INPUT o4 1 OUTPUT LL Vo = 1000pF 4 5 INPUT o 2 tour MIC426 Ve = 1000pF (1/2 MIG428) = +5V INPUT 0.4V 18V OUTPUT OV Figure 1. Inverting Driver Switching Time Vg= 18V o op Sf 7HF 0.1HF 6 = = 2 INPUT o Ss 7 0 OUTPUT A aa Ve = 1000pF 4 5 = INPUT [> v OUTPUT MIC427 Vo = 1000pF (1/2 MIC428) +5V INPUT 0.4Vv 18V OUTPUT ov Figure 2. Non-Inverting Driver Switching Time 5-9Mi Typical Characteristic Curves C426/427/428 Rise and Fall Time vs. Supply Voltage 70 C, = 1000pF 60 FT, = 25C 50 =z 40 a 30 20 10 0 0 5 10 15 20 SUPPLY VOLTAGE (V) Delay Time vs. Temperature 35 C, = 1000pF 30 [| V, = 18V 25 e 20 o 15 40 5 0 -75 50-25 0 25 50 75100125 150 TEMPERATURE (C) Supply Current vs. Frequency 30 hs = 25C Vg = 18V = = 1000pF 5 20 ivy x io 2 5 7 10 a 2 Yn 1 10 FREQUENCY (kHz) 100 1000 Delay Time vs. Supply Voltage C, = 1000pF Ty = 25C o = a = = 0 5 10 15 20 SUPPLY VOLTAGE (V) Supply Current vs. Capacitive Load Ta = 25C = Vg = 18V << E E Z Lu ac ac 2 3 > a a a > wn 10 100 1000 10000 CAPACITIVE LOAD (pF) High Output vs. Current 1.20 Ty = 25C Vo = 6V 96 = p72 2 0 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 oe = w 20 = 10 -75 -80 -25 0 25 50 75100125150 TEMPERATURE (C) Rise and Fall Time vs. Capacitive Load Time (ns) 10 , 10 100 1000 CAPACITIVE LOAD (pF) 10000 Low Output vs. Current iy 3 Ty = 25C Vg = BV OUTPUT VOLTAGE (V) i > I o a iy = .00 0 10 20 30 40 50 60 70 80 90 100 CURRENT SUNK (mA)MIC 426/427/428 Micrel Typical Characteristic Curves (Continued) Quiescent Power Supply 5 Current vs. Supply Voitage Quiescent Power Supply Current vs. Supply Voltage Package Power Dissipation 400 1250 = _ = 2 <n w 1000 SN = OS SOIC 5 5 200 o SN Wi 1.5 Ww Ore ao ac < < 750 N ac & 5 5 150 =a PoIRSS 1.0 |____ NOLOAD | : NO LOAD 22 500 NS > BOTH INPUTS LOGIC "1" 71 100 BOTH INPUTS LoGic "o"| 22 CERDIP a Ty = 25C i Ta = 25C zu B05 B 50 5 250 oO Q 0 0 5 10 15 20 0 10 15 25 460)0CtO7H.sdD.sdN25Ss*d'SO SUPPLY VOLTAGE (V) 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 0.1pF 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 ora ground plane should be used. Input Stage The input voltage level changes the no load or quiescent supply current. The N channel 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 400A maximum. Minimum power dissipation occurs for logic 0 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 1nA over this range. SUPPLY VOLTAGE (V) AMBIENT TEMPERATURE (C) 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 MIC426/427/428 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 4omW. Two other power dissipation components are: Output stage AC and DC load power. * Transition state power. Output stage power is: Po =Ppc + Pac 2 =Vo (Ipc) +f CL Vs Where: Vo = DC output voltage Ipc = DC output load current f = Switching frequency Vs = Supply voltage in power MOSFET drive applications, the Ppc term is negligible. MOSFET power transistors are high impedance, capacitive input devices. In applications where resistive loads or relays are driven, the Popc componentwill normally dominate. The magnitude of Pac is readily estimated for several cases: A. 1. f = 200kHz B. 1.4=200kHz 2. CL = 1000pF 2. CL = 1000pF 3. Vs = 18V 3. Vs = 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 5-11MIC426/427/428 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 Voitage Doubler +15V 1N4001 1N4001 Voltage Inverter 1N4001 5-12 Micrel power dissipation will be reduced by minimizing input rise times. As shown in the characteristic curves, average supply current is frequency dependent. OUTPUT VOLTAGE vs LOAD CURRENT Yout) 0 5 10 20 30 40 50 60 70 80 % 100 lout (mA) OUTPUT VOLTAGE vs LOAD CURRENT Your) 0 5 10 20 30 40 50 60 70 80 % {mA) 100 jouT