MIC4426/4427/4428 Micrel MIC4426/4427/4428 Dual 1.5A-Peak Low-Side MOSFET Driver General Description Features The MIC4426/4427/4428 family are highly-reliable dual lowside MOSFET drivers fabricated on a BiCMOS/DMOS process for low power consumption and high efficiency. These drivers translate TTL or CMOS input logic levels to output voltage levels that swing within 25mV of the positive supply or ground. Comparable bipolar devices are capable of swinging only to within 1V of the supply. The MIC4426/7/8 is available in three configurations: dual inverting, dual noninverting, and one inverting plus one noninverting output. • • • • • • • • • • • • • • • The MIC4426/4427/4428 are pin-compatible replacements for the MIC426/427/428 and MIC1426/1427/1428 with improved electrical performance and rugged design (Refer to the Device Replacement lists on the following page). They can withstand up to 500mA of reverse current (either polarity) without latching and up to 5V noise spikes (either polarity) on ground pins. Primarily intended for driving power MOSFETs, MIC4426/7/8 drivers are suitable for driving other loads (capacitive, resistive, or inductive) which require low-impedance, high peak current, and fast switching time. Other applications include driving heavily loaded clock lines, coaxial cables, or piezoelectric transducers. The only load limitation is that total driver power dissipation must not exceed the limits of the package. • Bipolar/CMOS/DMOS construction Latch-up protection to >500mA reverse current 1.5A-peak output current 4.5V to 18V operating range Low quiescent supply current 4mA at logic 1 input 400µA at logic 0 input Switches 1000pF in 25ns Matched rise and rall times 7Ω output impedance < 40ns typical delay Logic-input threshold independent of supply voltage Logic-input protection to –5V 6pF typical equivalent input capacitance 25mV max. output offset from supply or ground Replaces MIC426/427/428 and MIC1426/1427/1428 Dual inverting, dual noninverting, and inverting/ noninverting configurations ESD protection Applications • • • • MOSFET driver Clock line driver Coax cable driver Piezoelectic transducer driver Functional Diagram VS 0.6mA INVERTING 0.1mA OUTA INA 2kΩ NONINVERTING 0.6mA INVERTING 0.1mA OUTB INB 2kΩ NONINVERTING GND September 1999 1 MIC4426/4427/4428 MIC4426/4427/4428 Micrel Ordering Information Part Number Temperature Range Package Configuration MIC4426AM –55°C to +125°C 8-lead SOIC Dual Inverting MIC4426BM –40°C to +85°C 8-lead SOIC Dual Inverting MIC4426BMM –40°C to +85°C 8-lead MSOP Dual Inverting MIC4426BN –40°C to +85°C 8-lead Plastic DIP Dual Inverting MIC4427AM –55°C to +125°C 8-lead SOIC Dual Noninverting MIC4427BM –40°C to +85°C 8-lead SOIC Dual Noninverting MIC4427BMM –40°C to +85°C 8-lead MSOP Dual Noninverting MIC4427BN –40°C to +85°C 8-pin Plastic DIP Dual Noninverting MIC4428AM –55°C to +125°C 8-lead SOIC Inverting + Noninverting MIC4428BM –40°C to +85°C 8-lead SOIC Inverting + Noninverting MIC4428BMM –40°C to +85°C 8-lead MSOP Inverting + Noninverting MIC4428BN –40°C to +85°C 8-lead Plastic DIP Inverting + Noninverting MIC426/427/428 Device Replacement Discontinued Number MIC426CM MIC426BM MIC426CN MIC426BN MIC427CM MIC427BM MIC427CN MIC427BN MIC428CM MIC428BM MIC428CN MIC428BN MIC1426/1427/1428 Device Replacement Replacement MIC4426BM MIC4426BM MIC4426BN MIC4426BN MIC4427BM MIC4427BM MIC4427BN MIC4427BN MIC4428BM MIC4428BM MIC4428BN MIC4428BN Discontinued Number MIC1426CM MIC1426BM MIC1426CN MIC1426BN MIC1427CM MIC1427BM MIC1427CN MIC1427BN MIC1428CM MIC1428BM MIC1428CN MIC1428BN Replacement MIC4426BM MIC4426BM MIC4426BN MIC4426BN MIC4427BM MIC4427BM MIC4427BN MIC4427BN MIC4428BM MIC4428BM MIC4428BN MIC4428BN Pin Configuration MIC4426 MIC4426 NC 1 8 NC INA 2 7 OUTA MIC4427 2 A 7 4 B 5 6 VS GND 3 5 OUTB INB 4 8 NC INA 2 7 OUTA MIC4428 2 A 7 4 B 5 6 VS GND 3 Dual Inverting MIC4427 NC 1 5 OUTB INB 4 8 NC INA 2 7 OUTA 2 A 7 4 B 5 6 VS GND 3 Dual Noninverting MIC4428 NC 1 5 OUTB INB 4 Inverting + Noninverting Pin Description Pin Number Pin Name 1, 8 NC not internally connected 2 INA Control Input A: TTL/CMOS compatible logic input. 3 GND Ground 4 INB Control Input B: TTL/CMOS compatible logic input. 5 OUTB 6 VS 7 OUTA MIC4426/4427/4428 Pin Function Output B: CMOS totem-pole output. Supply Input: +4.5V to +18V Output A: CMOS totem-pole output. 2 September 1999 MIC4426/4427/4428 Micrel Absolute Maximum Ratings (Note 1) Operating Ratings (Note 2) Supply Voltage (VS) .................................................... +22V Input Voltage (VIN) ......................... VS + 0.3V to GND – 5V Junction Temperature (TJ) ........................................ 150°C Storage Temperature ............................... –65°C to +150°C Lead Temperature (10 sec.) ...................................... 300°C ESD Rating, Note 3 Supply Voltage (VS) ..................................... +4.5V to +18V Temperature Range (TA) (A) ........................................................ –55°C to +125°C (B) .......................................................... –40°C to +85°C Package Thermal Resistance PDIP θJA ............................................................ 130°C/W PDIP θJC ............................................................. 42°C/W SOIC θJA ........................................................... 120°C/W SOIC θJC ............................................................. 75°C/W MSOP θJC ......................................................... 250°C/W Electrical Characteristics 4.5V ≤ Vs ≤ 18V; TA = 25°C, bold values indicate full specified temperature range; unless noted. Symbol Parameter Condition Min Typ 2.4 2.4 1.4 1.5 Max Units Input VIH Logic 1 Input Voltage VIL Logic 0 Input Voltage IIN Input Current 1.1 1.0 0 ≤ VIN ≤ VS –1 V V 0.8 0.8 V V 1 µA Output VOH High Output Voltage VOL Low Output Voltage RO Output Resistance IPK Peak Output Current I Latch-Up Protection VS–0.025 IOUT = 10mA, VS = 18V V 6 8 0.025 V 10 12 Ω Ω 1.5 withstand reverse current A >500 mA Switching Time tR Rise Time test Figure 1 18 20 30 40 ns ns tF Fall Time test Figure 1 15 29 20 40 ns ns tD1 Delay Tlme test Flgure 1 17 19 30 40 ns ns tD2 Delay Time test Figure 1 23 27 50 60 ns ns tPW Pulse Width test Figure 1 IS Power Supply Current VINA = VINB = 3.0V 1.4 1.5 4.5 8 mA mA IS Power Supply Current VINA = VINB = 0.0V 0.18 0.19 0.4 0.6 mA mA 400 ns Power Supply Note 1. Exceeding the absolute maximum rating may damage the device. Note 2. The device is not guaranteed to function outside its operating rating. Note 3. Devices are ESD sensitive. Handling precautions recommended. September 1999 3 MIC4426/4427/4428 MIC4426/4427/4428 Micrel Test Circuits VS = 18V VS = 18V 0.1µF 6 INA 2 7 A 4.7µF 0.1µF 6 OUTA INA 2 7 A 1000pF INB MIC4427 5 B OUTB INB 4 5 B 1000pF 5V 90% VS 90% Figure 2a. Noninverting Configuration 2.5V INPUT 10% 0V tD1 tPW 5V 90% 2.5V 10% 0V tF OUTB 1000pF Figure 1a. Inverting Configuration INPUT OUTA 1000pF MIC4426 4 4.7µF tD2 tR VS 90% tD1 tPW tR tD2 tF OUTPUT OUTPUT 10% 0V 10% 0V Figure 1b. Inverting Timing MIC4426/4427/4428 Figure 2b. Noninverting Timing 4 September 1999 MIC4426/4427/4428 Micrel Electrical Characteristics Rise and Fall Time vs. Supply Voltage 70 35 CL = 1000pF TA = 25°C 60 30 tR tF 10 0 20 15 10 5 10 15 SUPPLY VOLTAGE (V) 0 20 5 10 15 SUPPLY VOLTAGE (V) 20 t D1 15 -75 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (°C) 20 10 5 0 1k 400kHz T A = 25°C VS = 18V 70 Rise and Fall Time vs. Capacitive Load T A = 25°C VS = 18V 60 40 30 10 10 10 High Output vs. Current Low Output vs. Current VC = 5V TA = 25°C OUTPUT VOLTAGE (V) TA = 25°C | VS – VOUT | (V) 0.96 10 V 10 0.72 10 V 0.48 15 V 5V 0.24 0 0 1 10 100 FREQUENCY (kHz) SUPPLY CURRENT (µA) NO LOAD BOTH INPUTS LOGIC "1" TA = 25°C 0.5 5 10 15 SUPPLY VOLTAGE (V) September 1999 15 V 0.24 0 10 20 30 40 50 60 70 80 90 100 CURRENT SUNK (mA) Package Power Dissipation 1250 300 200 150 NO LOAD BOTH INPUTS LOGIC "0" TA = 25°C 100 50 0 0 0 0.48 Quiescent Power Supply 1.5 20 10 V 0 400 Current vs. Supply Voltage 2.0 1.0 0.72 CURRENT SOURCED (mA) Quiescent Power Supply Current vs. Supply Voltage VS = 5V 0.96 0 10 20 30 40 50 60 70 80 90 100 1000 100 1000 10000 CAPACITIVE LOAD (pF) 1.20 VS = 18V 20 2.5 100 1000 10000 CAPACITIVE LOAD (pF) 1.20 30 TA = 25°C CL = 1000pF 10 1 0 Supply Current vs. Frequency tF 200 kHz 20kHz 20 -75 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (°C) tR 100 50 MAXIMUM PACKAGE POWER DISSIPATION (mW) TIME (ns) 0 TIME (ns) t D2 25 SUPPLY CURRENT (mA) 10 80 CL = 1000pF VS = 18V SUPPLY CURRENT (mA) 35 30 tR 20 Supply Current vs. Capacitive Load Delay Time vs. Temperature SUPPLY CURRENT (mA) t D1 5 0 tF t D2 TIME (ns) 40 CL = 1000pF VS = 18V 30 25 TIME (ns) TIME (ns) 50 40 CL = 1000pF TA = 25°C 30 20 Rise and Fall Time vs. Temperature Delay Time vs. Supply Voltage 0 5 10 15 SUPPLY VOLTAGE (V) 5 20 1000 SOIC 750 500 PDIP 250 0 25 50 75 100 125 150 AMBIENT TEMPERATURE (°C) MIC4426/4427/4428 MIC4426/4427/4428 Micrel Power Dissipation Power dissipation should be calculated to make sure that the driver is not operated beyond its thermal ratings. Quiescent power dissipation is negligible. A practical value for total power dissipation is the sum of the dissipation caused by the load and the transition power dissipation (PL + PT). Applications Information Supply Bypassing Large currents are required to charge and discharge large capacitive loads quickly. For example, changing a 1000pF load by 16V in 25ns requires 0.8A from the supply input. To guarantee low supply impedance over a wide frequency range, parallel capacitors are recommended for power supply bypassing. Low-inductance ceramic MLC capacitors with short lead lengths (< 0.5") should be used. A 1.0µF film capacitor in parallel with one or two 0.1µF ceramic MLC capacitors normally provides adequate bypassing. Grounding Load Dissipation Power dissipation caused by continuous load current (when driving a resistive load) through the driver’s output resistance is: PL = IL2 RO For capacitive loads, the dissipation in the driver is: PL = f CL VS2 Transition Dissipation In applications switching at a high frequency, transition power dissipation can be significant. This occurs during switching transitions when the P-channel and N-channel output FETs are both conducting for the brief moment when one is turning on and the other is turning off. PT = 2 f VS Q Charge (Q) is read from the following graph: When using the inverting drivers in the MIC4426 or MIC4428, individual ground returns for the input and output circuits or a ground plane are recommended for optimum switching speed. The voltage drop that occurs between the driver’s ground and the input signal ground, during normal high-current switching, will behave as negative feedback and degrade switching speed. Control Input Unused driver inputs must be connected to logic high (which can be VS) or ground. For the lowest quiescent current (< 500µA) , connect unused inputs to ground. A logic-high signal will cause the driver to draw up to 9mA. The drivers are designed with 100mV of control input hysteresis. This provides clean transitions and minimizes output stage current spikes when changing states. The control input voltage threshold is approximately 1.5V. The control input recognizes 1.5V up to VS as a logic high and draws less than 1µA within this range. The MIC4426/7/8 drives the TL494, SG1526/7, MIC38C42, TSC170 and similar switch-mode power supply integrated circuits. 1×10-8 CHARGE (Q) 8×10-9 6×10-9 4×10-9 3×10-9 2×10-9 1×10-9 4 6 8 10 12 14 16 SUPPLY VOLTAGE (V) 18 Crossover Energy Loss per Transition MIC4426/4427/4428 6 September 1999 MIC4426/4427/4428 Micrel Package Information 0.026 (0.65) MAX) PIN 1 0.157 (3.99) 0.150 (3.81) DIMENSIONS: INCHES (MM) 0.020 (0.51) 0.013 (0.33) 0.050 (1.27) TYP 0.064 (1.63) 0.045 (1.14) 45° 0.0098 (0.249) 0.0040 (0.102) 0.197 (5.0) 0.189 (4.8) 0°–8° 0.010 (0.25) 0.007 (0.18) 0.050 (1.27) 0.016 (0.40) SEATING PLANE 0.244 (6.20) 0.228 (5.79) 8-lead SOP (M) 0.199 (5.05) 0.187 (4.74) 0.122 (3.10) 0.112 (2.84) DIMENSIONS: INCH (MM) 0.120 (3.05) 0.116 (2.95) 0.036 (0.90) 0.032 (0.81) 0.043 (1.09) 0.038 (0.97) 0.007 (0.18) 0.005 (0.13) 0.012 (0.30) R 0.012 (0.03) 0.0256 (0.65) TYP 0.008 (0.20) 0.004 (0.10) 5° MAX 0° MIN 0.012 (0.03) R 0.039 (0.99) 0.035 (0.89) 0.021 (0.53) 8-lead MM8™ MSOP (MM) PIN 1 DIMENSIONS: INCH (MM) 0.380 (9.65) 0.370 (9.40) 0.255 (6.48) 0.245 (6.22) 0.135 (3.43) 0.125 (3.18) 0.300 (7.62) 0.013 (0.330) 0.010 (0.254) 0.018 (0.57) 0.100 (2.54) 0.130 (3.30) 0.380 (9.65) 0.320 (8.13) 0.0375 (0.952) 8-lead Plastic DIP (N) September 1999 7 MIC4426/4427/4428 MIC4426/4427/4428 Micrel MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB USA http://www.micrel.com This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. © 1999 Micrel Incorporated MIC4426/4427/4428 8 September 1999