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MIC4426/4427/4428
Micrel
MIC4426/4427/4428
Dual 1.5A-Peak Low-Side MOSFET Driver
General Description
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.
Features
* * * * * 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 400A at logic 0 input Switches 1000pF in 25ns Matched rise and rall times 7 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 MOSFET driver Clock line driver Coax cable driver Piezoelectic transducer driver
* * * * * * * * * * * * * * *
Applications
Functional Diagram
VS
0.6mA 0.1mA
INVERTING
OUTA INA 2k NONINVERTING
0.6mA 0.1mA
INVERTING
OUTB INB 2k NONINVERTING
GND
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MIC4426/4427/4428
Micrel
Ordering Information
Part Number MIC4426AM MIC4426BM MIC4426BMM MIC4426BN MIC4427AM MIC4427BM MIC4427BMM MIC4427BN MIC4428AM MIC4428BM MIC4428BMM MIC4428BN Temperature Range -55C to +125C -40C to +85C -40C to +85C -40C to +85C -55C to +125C -40C to +85C -40C to +85C -40C to +85C -55C to +125C -40C to +85C -40C to +85C -40C to +85C Package 8-lead SOIC 8-lead SOIC 8-lead MSOP 8-lead Plastic DIP 8-lead SOIC 8-lead SOIC 8-lead MSOP 8-pin Plastic DIP 8-lead SOIC 8-lead SOIC 8-lead MSOP 8-lead Plastic DIP Configuration Dual Inverting Dual Inverting Dual Inverting Dual Inverting Dual Noninverting Dual Noninverting Dual Noninverting Dual Noninverting Inverting + Noninverting Inverting + Noninverting Inverting + Noninverting Inverting + Noninverting
MIC426/427/428 Device Replacement
Discontinued Number MIC426CM MIC426BM MIC426CN MIC426BN MIC427CM MIC427BM MIC427CN MIC427BN MIC428CM MIC428BM MIC428CN MIC428BN Replacement MIC4426BM MIC4426BM MIC4426BN MIC4426BN MIC4427BM MIC4427BM MIC4427BN MIC4427BN MIC4428BM MIC4428BM MIC4428BN MIC4428BN
MIC1426/1427/1428 Device Replacement
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
NC 1 INA 2 GND 3 INB 4 8 NC 7 OUTA 6 VS 5 OUTB 4 B 5 2 A 7
MIC4426
NC 1 INA 2 GND 3 INB 4
MIC4427
8 NC 7 OUTA 6 VS 5 OUTB 4 2
MIC4427
NC 1 A 7 INA 2 GND 3 B 5 INB 4
MIC4428
8 NC 7 OUTA 6 VS 5 OUTB 4 2
MIC4428
A 7
B
5
Dual Inverting
Dual Noninverting
Inverting + Noninverting
Pin Description
Pin Number 1, 8 2 3 4 5 6 7 Pin Name NC INA GND INB OUTB VS OUTA Pin Function not internally connected Control Input A: TTL/CMOS compatible logic input. Ground Control Input B: TTL/CMOS compatible logic input. Output B: CMOS totem-pole output. Supply Input: +4.5V to +18V Output A: CMOS totem-pole output.
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Absolute Maximum Ratings (Note 1)
Supply Voltage (VS) .................................................... +22V Input Voltage (VIN) ......................... VS + 0.3V to GND - 5V Junction Temperature (TJ) ........................................ 150C Storage Temperature ............................... -65C to +150C Lead Temperature (10 sec.) ...................................... 300C ESD Rating, Note 3
Operating Ratings (Note 2)
Supply Voltage (VS) ..................................... +4.5V to +18V Temperature Range (TA) (A) ........................................................ -55C to +125C (B) .......................................................... -40C to +85C Package Thermal Resistance PDIP JA ............................................................ 130C/W PDIP JC ............................................................. 42C/W SOIC JA ........................................................... 120C/W SOIC JC ............................................................. 75C/W MSOP JC ......................................................... 250C/W
Electrical Characteristics
4.5V Vs 18V; TA = 25C, bold values indicate full specified temperature range; unless noted. Symbol Input VIH VIL IIN Output VOH VOL RO IPK I High Output Voltage Low Output Voltage Output Resistance Peak Output Current Latch-Up Protection withstand reverse current >500 IOUT = 10mA, VS = 18V 6 8 1.5 VS-0.025 0.025 10 12 V V A mA Logic 1 Input Voltage Logic 0 Input Voltage Input Current 0 VIN VS -1 2.4 2.4 1.4 1.5 1.1 1.0 0.8 0.8 1 V V V V A Parameter Condition Min Typ Max Units
Switching Time tR tF tD1 tD2 tPW Power Supply IS IS
Note 1. Note 2. Note 3.
Rise Time Fall Time Delay Tlme Delay Time Pulse Width
test Figure 1 test Figure 1 test Flgure 1 test Figure 1 test Figure 1 400
18 20 15 29 17 19 23 27
30 40 20 40 30 40 50 60
ns ns ns ns ns ns ns ns ns
Power Supply Current Power Supply Current
VINA = VINB = 3.0V VINA = VINB = 0.0V
1.4 1.5 0.18 0.19
4.5 8 0.4 0.6
mA mA mA mA
Exceeding the absolute maximum rating may damage the device. The device is not guaranteed to function outside its operating rating. Devices are ESD sensitive. Handling precautions recommended.
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Test Circuits
VS = 18V VS = 18V
6
0.1F
7
4.7F
2
6
0.1F
7
4.7F
INA
2
A MIC4426
OUTA 1000pF
INA
A MIC4427
OUTA 1000pF
INB
4
B
5
OUTB 1000pF
INB
4
B
5
OUTB 1000pF
Figure 1a. Inverting Configuration
5V 90% 10% 0V VS 90% OUTPUT 10% 0V tD1 tPW
Figure 2a. Noninverting Configuration
5V 90% 10% 0V tPW tR tD2
2.5V INPUT
2.5V
INPUT
tF
tD2
tR
VS 90% OUTPUT 10% 0V
tD1
tF
Figure 1b. Inverting Timing
Figure 2b. Noninverting Timing
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Electrical Characteristics
Rise and Fall Time vs. Supply Voltage
70 60 50 CL = 1000pF TA = 25C 35 30 25
Delay Time vs. Supply Voltage
CL = 1000pF TA = 25C t D2 40
Rise and Fall Time vs. Temperature
CL = 1000pF VS = 18V 30 tF tR 20
TIME (ns)
30 20 10 0 0 5 10 15 SUPPLY VOLTAGE (V) 20 tF tR
TIME (ns)
15 10 5 0 0
t D1
TIME (ns)
20
40
20
10 5 10 15 SUPPLY VOLTAGE (V) -75 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (C)
Delay Time vs. Temperature
35 t D2 80 30 25 CL = 1000pF VS = 18V 70 60
Supply Current vs. Capacitive Load
T A = 25C VS = 18V 400kHz 1k
Rise and Fall Time vs. Capacitive Load
T A = 25C VS = 18V 100 tR
SUPPLY CURRENT (mA)
TIME (ns)
20 15 10 5 0 -75 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (C) t D1
40 30 20 10 0 10 100 1000 10000 CAPACITIVE LOAD (pF) 200 kHz 20kHz
TIME (ns)
50
tF 10
1 10 100 1000 10000 CAPACITIVE LOAD (pF)
Supply Current vs. Frequency
30 1.20 0.96 TA = 25C CL = 1000pF 20 10 V VS = 18V
High Output vs. Current
1.20 TA = 25C VC = 5V
Low Output vs. Current
TA = 25C VS = 5V
SUPPLY CURRENT (mA)
OUTPUT VOLTAGE (V)
0.96 0.72 0.48 15 V 0.24 0 10 V
| VS - V | (V) OUT
0.72 0.48
10 V
10 5V
15 V 0.24 0
0 1 10 100 FREQUENCY (kHz) 1000
0 10 20 30 40 50 60 70 80 90 100 CURRENT SOURCED (mA)
0 10 20 30 40 50 60 70 80 90 100 CURRENT SUNK (mA)
2.5
Quiescent Power Supply Current vs. Supply Voltage
SUPPLY CURRENT (A)
Quiescent Power Supply
400 Current vs. Supply Voltage 300 200 150 100 50 0 NO LOAD BOTH INPUTS LOGIC "0" TA = 25C 1250
Package Power Dissipation
MAXIMUM PACKAGE POWER DISSIPATION (mW)
SUPPLY CURRENT (mA)
2.0 1.5 1.0 0.5 0 0 5 10 15 20 SUPPLY VOLTAGE (V) NO LOAD BOTH INPUTS LOGIC "1" TA = 25C
1000 750 500 250 0 SOIC
PDIP
0
5 10 15 SUPPLY VOLTAGE (V)
20
25
50
75
100
125
150
AMBIENT TEMPERATURE (C)
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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 1.0F film capacitor in parallel with one or two 0.1F ceramic MLC capacitors normally provides adequate bypassing. Grounding 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 (< 500A) , 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 1A within this range. The MIC4426/7/8 drives the TL494, SG1526/7, MIC38C42, TSC170 and similar switch-mode power supply integrated circuits.
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:
1x10-8 8x10-9
CHARGE (Q)
6x10-9 4x10-9 3x10-9 2x10-9
1x10-9 4 6 8 10 12 14 16 SUPPLY VOLTAGE (V) 18
Crossover Energy Loss per Transition
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Package Information
0.026 (0.65) MAX) PIN 1
0.157 (3.99) 0.150 (3.81)
DIMENSIONS: INCHES (MM)
0.050 (1.27) TYP
0.020 (0.51) 0.013 (0.33) 0.0098 (0.249) 0.0040 (0.102) 0-8 SEATING PLANE 45 0.010 (0.25) 0.007 (0.18)
0.064 (1.63) 0.045 (1.14)
0.197 (5.0) 0.189 (4.8)
0.050 (1.27) 0.016 (0.40) 0.244 (6.20) 0.228 (5.79)
8-lead SOP (M)
0.122 (3.10) 0.112 (2.84)
0.199 (5.05) 0.187 (4.74)
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) 0.012 (0.30) R
0.007 (0.18) 0.005 (0.13)
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 MM8TM MSOP (MM)
PIN 1 DIMENSIONS: INCH (MM)
0.380 (9.65) 0.370 (9.40)
0.135 (3.43) 0.125 (3.18)
0.255 (6.48) 0.245 (6.22) 0.300 (7.62)
0.013 (0.330) 0.010 (0.254) 0.018 (0.57) 0.100 (2.54) 0.130 (3.30) 0.0375 (0.952) 0.380 (9.65) 0.320 (8.13)
8-lead Plastic DIP (N)
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MIC4426/4427/4428
Micrel
MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131
TEL
USA
+ 1 (408) 944-0800
FAX
+ 1 (408) 944-0970
WEB
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. (c) 1999 Micrel Incorporated
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