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mic4426

Functional Diagram

Pin Description

Pin Number

Pin Name

Pin Function

1, 8NC not internally connected

2INA Control Input A: TTL/CMOS compatible logic input.3GND Ground

4INB Control Input B: TTL/CMOS compatible logic input.5OUTB Output B: CMOS totem-pole output.6V S Supply Input: +4.5V to +18V 7

OUTA

Output A: CMOS totem-pole output.

Pin Configuration

NC INA GND INB MIC4426

Inverting MIC4426

MIC4427

MIC4428

4MIC4427

Noninverting MIC4428

Noninverting

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

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

Absolute Maximum Ratings (Note 1)

Supply Voltage (V S) (22)

Input Voltage (V IN).........................V S + 0.3V to GND – 5V Junction Temperature (T J)........................................150°C Storage Temperature...............................–65°C to +150°C Lead Temperature (10 sec.)......................................300°C ESD Rating, Note 3Operating Ratings (Note 2)

Supply Voltage (V S).....................................+4.5V to +18V Temperature Range (T A)

(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 ≤ V s≤ 18V; T A = 25°C, bold values indicate full specified temperature range; unless noted.

Symbol Parameter Condition Min Typ Max Units Input

V IH Logic 1 Input Voltage 2.4 1.4V

2.4 1.5V V IL Logic 0 Input Voltage 1.10.8V

1.00.8V

I IN Input Current0 ≤ V IN≤ V S–11μA Output

V OH High Output Voltage V S–0.025V V OL Low Output Voltage0.025V R O Output Resistance I OUT = 10mA, V S = 18V610?

812?I PK Peak Output Current 1.5A I Latch-Up Protection withstand reverse current>500mA Switching Time

t R Rise Time test Figure 11830ns

2040ns t F Fall Time test Figure 11520ns

2940ns t D1Delay Tlme test Flgure 11730ns

1940ns t D2Delay Time test Figure 12350ns

2760ns t PW Pulse Width test Figure 1400ns Power Supply

I S Power Supply Current V INA = V INB = 3.0V 1.4 4.5mA

1.58mA

I S Power Supply Current V INA = V INB = 0.0V0.180.4mA

0.190.6mA

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.

Test Circuits

INA INB

Figure 2a.

Noninverting Configuration

90%

10%10%0V 5V V S OUTPUT

INPUT

90%0V

Figure 2b. Noninverting Timing

INA

INB

Figure 1a.

Inverting Configuration

V OUTPUT

INPUT

Figure 1b.Inverting Timing

Electrical Characteristics

Rise and Fall Time vs. Supply Voltage

706050

100T

I M E (n s )

2030Delay Time vs. Supply Voltage

353025

2050

T I M E (n s )

1015-250150

2550TEMPERATURE (°C)

7510012510

10000100CAPACITIVE LOAD (pF)

1000

10000100CAPACITIVE LOAD (pF)

1000

Supply Current vs. Frequency

0S U P P L Y C U R R E N T (m A )

1000

10FREQUENCY (kHz)

100

High Output vs. Current

| V – V | (V )S O U T

CURRENT SOURCED (mA)

Low Output vs. Current

1.20

0.960

0.48

0.720.24010CURRENT SUNK (mA)

2030405060708090100

O U T P U T V O L T A G E (V )

Rise and Fall Time

vs. Temperature

1.20

0.96

0.48

0.720.240102030405060708090100

-50-75Quiescent Power Supply Current vs. Supply Voltage

Package Power Dissipation

AMBIENT TEMPERATURE (°C)

10007502500

500Quiescent Power Supply 0

0.52.5

1.01.5S U P P L Y C U R R E N T (m A )

SUPPLY VOLTAGE (V)

2.0S U P P L Y C U R R E N T (μA )

50100150200300400SUPPLY VOLTAGE (V)

M A X I M U M P A C K A G E

P O W E R D I S S I P A T I O N (m W )

1250

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 sup-ply 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-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 V S) 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 hyster-esis. 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 V S 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 (P L + P T).

Load Dissipation

Power dissipation caused by continuous load current (when driving a resistive load) through the driver’s output resistance is:

P L = I L2 R O

For capacitive loads, the dissipation in the driver is: P L = f C L V S2

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.

P T = 2 f V S 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

4681012141618

SUPPLY VOLT AGE (V)

(

)

Crossover Energy Loss per Transition

Package Information

8-lead SOP (M)

8-lead MM8? MSOP (MM)

0.380 (9.65)0.370 (9.40)

PIN 1

DIMENSIONS:INCH (MM)

8-lead Plastic DIP (N)

MICREL INC.1849 FORTUNE DRIVE SAN JOSE, CA95131USA

TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB https://www.wendangku.net/doc/748469754.html,

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