MIC4427YM【PDF 7/9 页】IC DRIVER MOSFET DUAL 1.5A 8SOIC

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MIC4426/4427/4428

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 ?lm 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 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 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 V S as a logic high and draws less than

1μA within this range.

Micrel, Inc.

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 signi?cant. 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

6×10 -9

4×10 -9

3×10 -9

2×10 -9

The MIC4426/7/8 drives the TL494, SG1526/7, MIC38C42,

TSC170 and similar switch-mode power supply integrated

circuits.

1×10 -9

4

6

8 10 12 14

SUPPLY VOLTAGE (V)

16

18

Crossover Energy Loss per Transition

April 2008

7

M9999-042108

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