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MIC4126/27/28
Dual 1.5A-Peak Low-Side MOSFET Drivers in Advanced Packaging
General Description
The MIC4126, MIC4127, and MIC4128 family are highlyreliable dual 1.5A low-side MOSFET drivers fabricated on Micrel's BiCMOS/DMOS process. The devices feature low power consumption and high efficiency. The MIC4126/27/28 translate TTL or CMOS input logic levels to output voltage levels that swing within 25mV of the positive supply or ground whereas comparable bipolar devices are capable of swinging only to within 1V of the supply. The MIC4126/7/8 is available in three configurations: dual inverting, dual non-inverting, and complimentary output. The MIC4126/27/28 offer pin-compatible as well as smaller footprint replacements for the MIC4426/27/28 with improved packaging and electrical performance. The MIC4126/27/28 are available in exposed pad, EPAD, SOIC-8L and MSOP-8L options as well as a small-size 3mm x 3mm MLFTM-8L option. The devices have an input operating range of 4.5V to 20V. Primarily intended for driving power MOSFETs, MIC4426/7/8 drivers are suitable for driving other loads (capacitive, resistive, or inductive) which require lowimpedance, high peak current, and fast switching time. The devices can withstand up to 500mA of reverse current (either polarity) without latching and up to 5V noise spikes (either polarity) on ground pins. Data sheets and support documentation can be found on Micrel's web site at www.micrel.com.
Features
* Dual 1.5A-peak drivers * 4.5V to 20V operating range * Exposed backside pad packaging reduces heat - ePAD SOIC-8L (JA = 58C/W) - ePAD MSOP-8L (JA = 60C/W) - 3mm x 3mm MLFTM-8L (JA = 60C/W) * Bipolar/CMOS/DMOS construction - 25mV maximum output offset from supply or ground * Latch-up protection to >200mA reverse current * Switches 1000pF in 25ns * Logic-input threshold independent of supply voltage * Logic-input protection to -5V * 6pF typical equivalent input capacitance * Dual inverting, dual non-inverting, and complementary configurations * -40C to +125C operating junction temperature range
Applications
* DC/DC converters * Motor drivers * Clock line driver
Functional Diagram
MIC4126/27/28 Block Diagram
MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc, Inc. Micrel, Inc. * 2180 Fortune Drive * San Jose, CA 95131 * USA * tel +1(408) 944-0800 * fax +1(408) 474-1000 * http://www.micrel.com
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Ordering Information
Part Number MIC4126YME MIC4126YMME MIC4126YML MIC4127YME MIC4127YMME MIC4127YML MIC4128YME MIC4128YMME MIC4128YML Configuration Dual Inverting Dual Inverting Dual Inverting Dual Non-inverting Dual Non-inverting Dual Non-inverting Inverting + Non-inverting Inverting + Non-inverting Inverting + Non-inverting Package EPAD 8-lead SOIC EPAD 8-lead MSOP 8-lead MLF EPAD 8-lead SOIC EPAD 8-lead MSOP 8-lead MLF EPAD 8-lead SOIC EPAD 8-lead MSOP 8-lead MLF Junction Temp. Range(1) -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C -40 to +125C Lead Finish Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free Pb-Free
Pin Configuration
EPAD SOIC-8L (ME) EPAD MSOP-8L (MME) MLF-8L (ML)
EPAD SOIC-8L (ME) EPAD MSOP-8L (MME) MLF-8L (ML)
EPAD SOIC-8L (ME) EPAD MSOP-8L (MME) MLF-8L (ML)
Pin Description
Pin Number 1, 8 2 3 4 5 6 7 EP Pin Name NC INA GND INB OUTB VS OUTA GND 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 +20V Output A: CMOS totem-pole output. Ground, backside pad.
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Absolute Maximum Ratings (1)
Supply Voltage (VS)......................................................+24V 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 (2)
Supply Voltage (VS) ...................................... +4.5V to +20V Temperature Range (TJ) ........................... -40C to +125C Package Thermal Resistance 3X3 MLFTM JA ................................................. 60C/W EPAD MSOP-8L JA ............................... 60C/W EPAD SOIC-8L JA ................................. 58C/W
Electrical Characteristics (4)
4.5V VS 20V; Input voltage slew rate >1V/s; COUT = 1000pF. TA = 25C, bold values indicate full specified temperature range; unless noted. Symbol Parameter Condition Min Typ Max Input VIH VIL IIN Output VOH VOL RO IPK I tR tF tD1 tD2 High Output Voltage Low Output Voltage Output Resistance Peak Output Current Latch-Up Protection Rise Time Fall Time Delay Time Delay Time Withstand reverse current Test Figure 1 Test Figure 1 Test Figure 1 Test Figure 1 >200 13 20 15 18 37 43 40 45 1.4 1.5 0.18 0.19 30 40 25 40 50 60 60 70 4.5 8 0.4 0.6 IOUT = 10mA, VS = 20V 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 1.6 1.1 1.3 0.8 0.8 1 V V A Units
Switching Time ns ns ns ns
Power Supply IS IS Power Supply Current Power Supply Current VINA = VINB = 3.0V VINA = VINB = 0.0V mA mA
Notes: 1. Exceeding the absolute maximum rating may damage the device. 2. The device is not guaranteed to function outside its operating rating. 3. Devices are ESD sensitive. Handling precautions recommended. Human body model: 1.5k in series with 100pF. 4. Specification for packaged product only.
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Test Circuit
Figure 1a. Inverting Configuration
Figure 2a. Non-inverting Configuration
Figure 1b. Inverting Timing
Figure 2b. Non-inverting Timing
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Typical Characteristics
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Application 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 MIC4126 or MIC4128, 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. The E-pad and MLF packages have an exposed pad under the package. It's important for good thermal performance that this pad is connected to a ground plane. 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 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. 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). 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:
Crossover Energy Loss per Transition
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Package Information
8-Pin Exposed Pad SOIC (M)
8-Pin Exposed Pad MSOP (MM)
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8-Pin MLF (ML)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http:/www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2004 Micrel, Incorporated.
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