5962-8850307PA - MICROCHIP TECHNOLOGY

April 2008 1 M9999-042108

MIC4426/4427/4428 Micrel, Inc.

MIC4426/4427/4428

Dual 1.5A-Peak Low-Side MOSFET Driver

General Description

The MIC4426/4427/4428 family are highly-reliable dual low-

side 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 im-

proved 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.

Note See MIC4126/4127/4128 for high power and narrow

pulse applications.

Functional Diagram

INA

OUTA

INVERTING

NONINVERTING

0.1mA

0.6mA

2kΩ

INB

OUTB

INVERTING

NONINVERTING

0.1mA

0.6mA

2kΩ

GND

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

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

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

MIC4426/4427/4428 Micrel, Inc.

M9999-042108 2 April 2008

Ordering Information

Part Number Temperature

Standard Pb-Free Range Package Conﬁguration

MIC4426BM MIC4426YM –40ºC to +85ºC 8-Pin SOIC Dual Inverting

MIC4426CM MIC4426ZM –0ºC to +70ºC 8-Pin SOIC Dual Inverting

MIC4426BMM MIC4426YMM –40ºC to +85ºC 8-Pin MSOP Dual Inverting

MIC4426BN MIC4426YN –40ºC to +85ºC 8-Pin PDIP Dual Inverting

MIC4426CN MIC4426ZN –0ºC to +70ºC 8-Pin PDIP Dual Inverting

MIC4427BM MIC4427YM –40ºC to +85ºC 8-Pin SOIC Dual Non-Inverting

MIC4427CM MIC4427ZM –0ºC to +70ºC 8-Pin SOIC Dual Non-Inverting

MIC4427BMM MIC4427YMM –40ºC to +85ºC 8-Pin MSOP Dual Non-Inverting

MIC4427BN MIC4427YN –40ºC to +85ºC 8-Pin PDIP Dual Non-Inverting

MIC4427CN MIC4427ZN –0ºC to +70ºC 8-Pin PDIP Dual Non-Inverting

MIC4428BM MIC4428YM –40ºC TO +85ºC 8-Pin SOIC Inverting + Non-Inverting

MIC4428CM MIC4428ZM –0ºC to +70ºC 8-Pin SOIC Inverting + Non-Inverting

MIC4428BMM MIC4428YMM –40ºC to +85ºC 8-Pin MSOP Inverting + Non-Inverting

MIC4428BN MIC4428YN –40ºC to +85ºC 8-Pin PDIP Inverting + Non-Inverting

MIC4428CN MIC4428ZN –0ºC to +70ºC 8-Pin PDIP Inverting + Non-Inverting

Note

DESC standard military drawing 5962-88503 available;

MIC4426, CERDIP 8-Pin SMD#: 5962-8850307PA

Micrel Part Number: 5952-8850307PA

MIC4427, CERDIP 8-Pin SMD#: 5962-8850308PA Micrel Part Number: 5952-8850308PA

MIC4428, CERDIP 8-Pin SMD#: 5962-8850309PA

Micrel Part Number: 5952-8850309PA

MIC426/427/428 Device Replacement

Discontinued Number Replacement

MIC426CM MIC4426BM

MIC426BM MIC4426BM

MIC426CN MIC4426BN

MIC426BN MIC4426BN

MIC427CM MIC4427BM

MIC427BM MIC4427BM

MIC427CN MIC4427BN

MIC427BN MIC4427BN

MIC428CM MIC4428BM

MIC428BM MIC4428BM

MIC428CN MIC4428BN

MIC428BN MIC4428BN

MIC1426/1427/1428 Device Replacement

Discontinued Number Replacement

MIC1426CM MIC4426BM

MIC1426BM MIC4426BM

MIC1426CN MIC4426BN

MIC1426BN MIC4426BN

MIC1427CM MIC4427BM

MIC1427BM MIC4427BM

MIC1427CN MIC4427BN

MIC1427BN MIC4427BN

MIC1428CM MIC4428BM

MIC1428BM MIC4428BM

MIC1428CN MIC4428BN

MIC1428BN MIC4428BN

April 2008 3 M9999-042108

MIC4426/4427/4428 Micrel, Inc.

Pin Conﬁguration

INA

GND

INB

OUTA

OUTB

MIC4426

Dual

Inverting

MIC4426 MIC4427 MIC4428

INA

GND

INB

OUTA

OUTB

MIC4427

Dual

Noninverting

INA

GND

INB

OUTA

OUTB

MIC4428

Inverting+

Noninverting

Pin Description

Pin Number Pin Name Pin Function

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 Output B: CMOS totem-pole output.

6 VS Supply Input: +4.5V to +18V

7 OUTA Output A: CMOS totem-pole output.

MIC4426/4427/4428 Micrel, Inc.

M9999-042108 4 April 2008

Absolute Maximum Ratings(1)

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(3)

Operating Ratings(2)

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 θJA ......................................................... 250°C/W

Electrical Characteristics(4)

4.5V ≤ Vs ≤ 18V; TA = 25°C, bold values indicate full speciﬁed temperature range; unless noted.

Symbol Parameter Condition Min Typ Max Units

Input

VIH Logic 1 Input Voltage 2.4 1.4 V

2.4 1.5 V

VIL Logic 0 Input Voltage 1.1 0.8 V

1.0 0.8 V

IIN Input Current 0 ≤ VIN ≤ VS –1 1 µA

Output

VOH High Output Voltage

VS–0.025

VOL Low Output Voltage 0.025 V

RO Output Resistance IOUT = 10mA, VS = 18V 6 10 Ω

8 12 Ω

IPK Peak Output Current 1.5 A

I Latch-Up Protection withstand reverse current >500 mA

Switching Time

tR Rise Time test Figure 1 18 30 ns

20 40 ns

tF Fall Time test Figure 1 15 20 ns

29 40 ns

tD1 Delay Tlme test Flgure 1 17 30 ns

19 40 ns

tD2 Delay Time test Figure 1 23 50 ns

27 60 ns

tPW Pulse Width test Figure 1 400 ns

Power Supply

IS Power Supply Current VINA = VINB = 3.0V 0.6 1.4 4.5 mA

1.5 8 mA

IS Power Supply Current VINA = VINB = 0.0V 0.18 0.4 mA

0.19 0.6 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.

4. Speciﬁcation for packaged product only.

April 2008 5 M9999-042108

MIC4426/4427/4428 Micrel, Inc.

Test Circuits

INA

INB

MIC4427

OUTA

1000pF

VS = 18V

0.1µF 4.7µF

OUTB

1000pF

Figure 2a. Noninverting Conﬁguration

90%

10%

OUTPUT

INPUT 90%

tD1

tD2

tPW

2.5V

Figure 2b. Noninverting Timing

INA

INB

MIC4426

OUTA

1000pF

VS = 18V

0.1µF 4.7µF

OUTB

1000pF

Figure 1a. Inverting Conﬁguration

tD1

90%

10%

tD2

OUTPUT

INPUT 90%

2.5V

tPW

Figure 1b. Inverting Timing

MIC4426/4427/4428 Micrel, Inc.

M9999-042108 6 April 2008

Electrical Characteristics

Rise and Fall Time vs.

0 5 2010 15

SUPPLY VOLTAGE (V)

TIME (ns)

0 5 2010 15

SUPPLY VOLTAGE (V)

TIME (ns)

-25 0 150

25 50

TEMPERATURE (°C)

75 100 125

TIME (ns)

-25 0 15025 50

TEMPERATURE (°C)

75 100 125

tD1

SUPPLY CURRENT (mA)

400kHz

200

kHz

20kHz

10 10000100

CAPACITIVE LOAD (pF)

1000

100

TIME (ns)

10 10000100

CAPACITIVE LOAD (pF)

1000

Supply Current vs. Frequency

V = 18V

10 V

5 V

SUPPLY CURRENT (mA)

1 100010

FREQUENCY (kHz)

100

High Output vs. Current

| V – V | (V)

S OUT

CURRENT SOURCED (mA)

Low Output vs. Current

1.20

0.96

0.48

0.72

0.24

0 10

CURRENT SUNK (mA)

20 30 40 50 60 70 80 90 100

10 V

15 V

OUTPUT VOL

AGE (V)

1.20

0.96

0.48

0.72

0.24

0 10 20 30 40 50 60 70 80 90 100

10 V

15 V

-50

-75

tD2

tD1

tD2

C = 1000pF

T = 25°C

C = 1000pF

T = 25°C

C = 1000pF

V = 18V

C = 1000pF

V = 18V

T = 25°C

V = 18V

T = 25°C

V = 18V

T = 25°C

C = 1000pF

AT = 25°C

AV = 5V

CT = 25°C

AV = 5V

25 50 15075 100

AMBIENT TEMPERATURE (°C)

1000

750

250

500

0.5

2.5

1.0

1.5

SUPPLY CURRENT (mA)

201550

SUPPLY VOLTAGE (V)

2.0

125

SUPPLY CURRENT (A)

15100 5

100

150

200

300

400

SUPPLY VOLTAGE (V)

MAXIMUM PACKAGE

POWER DISSIP

TION (mW)

1250

NO LOAD

BOTH INPUTS LOGIC "1"

T = 25°C

NO LOAD

BOTH INPUTS LOGIC "0"

T = 25°C

SOIC

PDIP

Supply Voltage

Delay Time vs.

Supply Voltage

Rise and Fall Time vs.

Temperature

Rise and Fall Time vs.

Capacitive Load

Supply Current vs.

Capacitive Load

Delay Time vs.

Temperature

Quiescent Power Supply Current

vs. Supply Voltage Quiescent Power Supply Current

vs. Supply Voltage

Package Power Dissipation

April 2008 7 M9999-042108

MIC4426/4427/4428 Micrel, Inc.

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

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-cur-

rent 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 hys-

teresis. 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.

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:

1×10-8

8×10-9

4×10-9

3×10-9

2×10-9

6×10-9

1×10-9

4 6 8 10 12 14 16 18

SUPPLY VOLTAGE (V)

CHARGE (Q)

Crossover Energy Loss per Transition

MIC4426/4427/4428 Micrel, Inc.

M9999-042108 8 April 2008

Package Information

45°

0°–8°

0.228 (5.79)

0.189 (4.8)

PLANE

MAX )

0.010 (0.25)

0.007 (0.18)

0.045 (1.14)

0.0040 (0.102)

0.013 (0.33)

0.150 (3.81)

TYP

PIN 1

INCHES (MM)

0.016 (0.40)

8-Pin SOIC (M)

0.004 (0.10)

0.035 (0.89)

0.021 (0.53)

0.012 (0.03) R

0.0256 (0.65) TYP

0.012 (0.30) R

5°

0° MIN

0.112 (2.84)

0.116 (2.95)

0.012 (0.03)

0.007 (0.18)

0.005 (0.13)

0.038 (0.97)

0.032 (0.81)

INCH (MM)

0.187 (4.74)

8-Pin MM8™ MSOP (MM)

8-Pin Plastic DIP (N)

April 2008 9 M9999-042108

MIC4426/4427/4428 Micrel, Inc.

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

This 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.