MIC4421ACMTR [MICROCHIP]

Buffer/Inverter Based MOSFET Driver, 9A, BCDMOS, PDSO8, SOIC-8;


型号：	MIC4421ACMTR
厂家：	MICROCHIP
描述：	Buffer/Inverter Based MOSFET Driver, 9A, BCDMOS, PDSO8, SOIC-8 驱动 CD 光电二极管接口集成电路驱动器
文件：	总13页 (文件大小：393K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MIC4421A/4422A

9A Peak Low-Side MOSFET Driver

Bipolar/CMOS/DMOS Process

General Description

Features

MIC4421A and MIC4422A MOSFET drivers are rugged,

efficient, and easy to use. The MIC4421A is an inverting

driver, while the MIC4422A is a non-inverting driver.

• High peak-output current: 9A Peak (typ.)

• Wide operating range: 4.5V to 18V (typ.)

• Minimum pulse width: 50ns

Both versions are capable of 9A (peak) output and can

drive the largest MOSFETs with an improved safe

operating margin. The MIC4421A/4422A accepts any logic

input from 2.4V to V_Swithout external speed-up capacitors

or resistor networks. Proprietary circuits allow the input to

swing negative by as much as 5V without damaging the

part. Additional circuits protect against damage from

electrostatic discharge.

• Latch-up proof: fully isolated process is inherently

immune to any latch-up

• Input will withstand negative swing of up to 5V

• High capacitive load drive: 47,000pF

• Low delay time: 15ns (typ.)

• Logic high input for any voltage from 2.4V to V_S

• Low equivalent input capacitance: 7pF (typ.)

• Low supply current: 500µA (typ.)

MIC4421A/4422A drivers can replace three or more

discrete components, reducing PCB area requirements,

simplifying product design, and reducing assembly cost.

• Output voltage swing to within 25mV of GND or V_S

Modern Bipolar/CMOS/DMOS construction guarantees

freedom from latch-up. The rail-to-rail swing capability of

CMOS/DMOS insures adequate gate voltage to the

MOSFET during power up/down sequencing. Since these

devices are fabricated on a self-aligned process, they have

very low crossover current, run cool, use little power, and

are easy to drive.

Applications

• Switch mode power supplies

• Motor controls

• Pulse transformer driver

• Class-D switching amplifiers

• Line drivers

• Driving MOSFET or IGBT parallel chip modules

• Local power ON/OFF switch

• Pulse generators

Data sheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

___________________________________________________________________________________________________________

Typical Application

Load

Voltage

MIC4422A

Si9410DY*

N-Channel

MOSFET

V_S

OUT

GND

+15V

0.1µF

1µF

0.1µF

Off

4,5

* Siliconix 30m, 7A max.

†

Load voltage limited by MOSFET drain-to-source rating

Low-Side Power Switch

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

M9999-062707

June 2007

Micrel, Inc.

MIC4421A/4422A

Ordering Information

Part Number

Configuration

Temperature Range

Package

Standard

Pb-Free

MIC4421AAM*

MIC4421ABM

MIC4421ACM

MIC4421ABN

MIC4421ACN

MIC4421ACT

MIC4422AAM*

MIC4422ABM

MIC4422ACM

MIC4422ABN

MIC4422ACN

MIC4422ACT

Inverting

–55° to +125°C

–40° to +85°C

0° to +70°C

8-Pin SOIC

8-Pin PDIP

5-Pin TO-220

8-Pin SOIC

8-Pin PDIP

5-Pin TO-220

MIC4421AYM

MIC4421AZM

MIC4421AYN

MIC4421AZN

MIC4421AZT

Inverting

–40° to +85°C

0° to +70°C

Inverting

0° to +70°C

Non-Inverting

–55° to +125°C

–40° to +85°C

0° to +70°C

MIC4422AYM

MIC4422AZM

MIC4422AYN

MIC4422AZN

MIC4422AZT

–40° to +85°C

0° to +70°C

* Special order. Contact factory.

Pin Configuration

OUT

GND

IN 2

OUT

GND

8-Pin PDIP (N)

8-Pin SOIC (M)

5-Pin TO-220 (T)

Pin Description

Pin Number

DIP, SOIC

Pin Number

Pin Name

TO-220-5

Control Input.

4, 5

2, 4

GND

Ground: Duplicate pins must be externally connected

together.

1, 8

6, 7

3, TAB

OUT

Supply Input: Duplicate pins must be externally connected

together.

Output: Duplicate pins must be externally connected

together.

—

Not connected.

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June 2007

Micrel, Inc.

MIC4421A/4422A

Absolute Maximum Ratings⁽¹⁾

Operating Ratings⁽²⁾

Supply Voltage (V_S)......................................................+20V

Control Input Voltage (V_IN). ............. V_S+ 0.3V to GND – 5V

Control Input Current (V_IN> V_S). .................................50mA

Power Dissipation, T_A< +25°C⁽⁴⁾

PDIP (θ_JA) ........................................................1478mW

SOIC (θ_JA)..........................................................767mW

TO-220 (θ_JA)........................................................1756W

Lead Temperature (soldering, #sec.)......................... 300°C

Storage Temperature (T_s) .........................–65°C to +150°C

ESD Rating⁽³⁾..................................................................2kV

Supply Voltage (V_S)....................................... +4.5V to +18V

Ambient Temperature (T_A)

A Version ............................................–55°C to +125°C

B Version ..............................................–40°C to +85°C

C Version..................................................0°C to +70°C

Junction Temperature (T_J) ......................................... 150°C

Package Thermal Resistance⁽⁴⁾

PDIP (θ_JA) .......................................................84.6°C/W

SOIC (θ_JA).....................................................163.0°C/W

TO-220 (θ_JA)....................................................71.2°C/W

PDIP (θ_JC) .......................................................41.2°C/W

SOIC (θ_JC).......................................................38.8°C/W

TO-220 (θ_JC) .....................................................6.5°C/W

Electrical Characteristics

T_A= 25°C with 4.5V ≤ V_S≤ 18V, bold values indicate –55°C< T_A< +125°C, unless noted.

Symbol

Parameter

Condition

Min

Typ

Max

Units

Power Supply

V_S

I_S

Operating Input Voltage

4.5

High Output Quiescent Current V_IN= 3V (MIC4422A), V_IN= 0 (MIC4421A)

0.5

1.5

Low Output Quiescent Current

V_IN= 0V (MIC4422A), V_IN= 3V (MIC4421A)

150

200

µA

Input

V_IH

Logic 1 Input Voltage

Logic 0 Input Voltage

Input Voltage Range

Input Current

See Figure 3

3.0

2.1

1.5

V_IL

0.8

V_S+0.3

V_IN

–5

I_IN

0V ≤ V_IN≤ V_S

–10

µA

Output

V_OH

V_OL

R_O

High Output Voltage

Low Output Voltage

See Figure 1

V_S+.025

0.025

Output Resistance,

Output High

_OUT= 10mA, V_S= 18V

0.6

0.8

1.0

3.6

Ω

Output Resistance,

Output Low

_OUT= 10mA, V_S= 18V

1.7

2.7

Ω

I_PK

I_DC

I_R

Peak Output Current

V_S= 18V (See Figure 8)

Continuous Output Current

Latch-Up Protection

Withstand Reverse Current

Duty Cycle ≤ 2%

t ≤ 300µs, Note 5

>1500

Switching Time (Note 5)

t_R

Rise Time

Test Figure 1, C_L= 10,000pF

Test Figure 1

120

t_F

Fall Time

120

t_D1

Delay Time

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June 2007

Micrel, Inc.

MIC4421A/4422A

Symbol

Parameter

Condition

Min

Typ

Max

Units

Switching Time (Note 5) continued

t_D2

Delay Time

Test Figure 1

t_PW

f_max

Minimum Input Pulse Width

Maximum Input Frequency

See Figure 1 and Figure 2.

MHz

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. Minimum footprint.

5. Guaranteed by design.

Test Circuit

= 18V

V_S

0.1µF

4.7µF

0.1µF

4.7µF

0.1µF

V_IN

V_OUT

10,000pF

V_IN

V_OUT

10,000pF

MIC4421A

MIC4422A

90%

2.5V

INPUT

t_PW50ns

10%

t_PW

t_D1

t_F

t_D2

t_R

t_D1

t_F

t_R

t_D2

V_S

90%

OUTPUT

10%

Figure 1. Inverting Driver Switching Time

Figure 2. Non-Inverting Driver Switching Time

Control Input Behavior

Logic 1

Logic 0

V_IL

V_IH

0.8V

1.5V

V_IH

V_S

2.1V

Figure 3. Input Hysteresis

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June 2007

Micrel, Inc.

MIC4421A/4422A

Typical Characteristics

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June 2007

Micrel, Inc.

MIC4421A/4422A

Typical Characteristics (continued)

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June 2007

Micrel, Inc.

MIC4421A/4422A

Functional Diagram

MIC4421A

INVERTING

0.3mA

0.1mA

OUT

MIC4422A

NONINVERTING

GND

Figure 4. MIC4421A/22A Block Diagram

which must sink 0.4mA from the two current sources.

The higher current through Q1 causes a larger drain-to-

source voltage drop across Q1. A slightly higher control

voltage is required to pull the input of the first inverter

down to its threshold.

Functional Description

Refer to the functional diagram.

The MIC4422A is a non-inverting driver. A logic high on

the IN produces gate drive output. The MIC4421A is an

inverting driver. A logic low on the IN produces gate

drive output. The output is used to turn on an external N-

channel MOSFET.

Q2 turns off after the first inverter output goes high. This

reduces the current through Q1 to 0.1mA. The lower

current reduces the drain-to-source voltage drop across

Q1. A slightly lower control voltage will pull the input of

the first inverter up to its threshold.

Supply

V_S(supply) is rated for +4.5V to +18V. External

capacitors are recommended to decouple noise.

Drivers

The second (optional) inverter permits the driver to be

manufactured in inverting and non-inverting versions.

Input

IN (control) is a TTL-compatible input. IN must be forced

high or low by an external signal. A floating input will

cause unpredictable operation.

The last inverter functions as a driver for the output

MOSFETs Q3 and Q4.

A high input turns on Q1, which sinks the output of the

0.1mA and the 0.3mA current source, forcing the input of

the first inverter low.

Output

OUT is designed to drive a capacitive load. V_OUT(output

voltage) is either approximately the supply voltage or

approximately ground, depending on the logic state

applied to IN.

Hysteresis

The control threshold voltage, when IN is rising, is

slightly higher than the control threshold voltage when

CTL is falling.

If IN is high, and V_S(supply) drops to zero, the output

will be floating (unpredictable).

When IN is low, Q2 is on, which applies the additional

0.3mA current source to Q1. Forcing IN high turns on Q1

M9999-062707

June 2007

Micrel, Inc.

MIC4421A/4422A

To guarantee low supply impedance over a wide

frequency range, a parallel capacitor combination is

recommended for supply bypassing. Low inductance

ceramic disk capacitor swith short lead lengths (< 0.5

inch) should be used. A 1µF low ESR film capacitor in

parallel with two 0.1µF low ESR ceramic capacitors,

(such as AVX RAM Guard^®), provides adequate

bypassing. Connect one ceramic capacitor directly

between pins 1 and 4. Connect the second ceramic

capacitor directly between pins 8 and 5.

Application Information

Supply Bypassing

Charging and discharging large capacitive loads quickly

requires large currents. For example, charging a

10,000pF load to 18V in 50ns requires 3.6A.

The MIC4421A/4422A has double bonding on the supply

pins, the ground pins and output pins. This reduces

parasitic lead inductance. Low inductance enables large

currents to be switched rapidly. It also reduces internal

ringing that can cause voltage breakdown when the

driver is operated at or near the maximum rated voltage.

Grounding

The high current capability of the MIC4421A/4422A

demands careful PC board layout for best performance.

Since the MIC4421A is an inverting driver, any ground

lead impedance will appear as negative feedback which

can degrade switching speed. Feedback is especially

noticeable with slow-rise time inputs. The MIC4421A

input structure includes about 600mV of hysteresis to

ensure clean transitions and freedom from oscillation,

but attention to layout is still recommended.

Internal ringing can also cause output oscillation due to

feedback. This feedback is added to the input signal

since it is referenced to the same ground.

V_S

1µF

MIC4421A

V_S

Figure 7 shows the feedback effect in detail. As the

MIC4421A input begins to go positive, the output goes

negative and several amperes of current flow in the

ground lead. As little as 0.05ꢀ of PC trace resistance

can produce hundreds of millivolts at the MIC4421A

ground pins. If the driving logic is referenced to power

ground, the effective logic input level is reduced and

oscillation may result.

Drive Signal

Conduction Angle

Control 0°C to 180°C

Conduction Angle

Drive

Logic

Control 180°C to 360°C

1µF

V_S

To insure optimum performance, separate ground traces

should be provided for the logic and power connections.

Connecting the logic ground directly to the MIC4421A

GND pins will ensure full logic drive to the input and

ensure fast output switching. Both of the MIC4421A

GND pins should, however, still be connected to power

ground.

MIC4422A

Phase 1 of 3 Phase Motor

Driver Using MIC4421A/22A

Figure 5. Direct Motor Drive

1N4448

(x2)

Output Voltage

vs. Load Current

V_IN+15V

1µF

WIMA

MKS2

0.1µF

50V

BYV 10

(x2)

MIC4422A

500µF

50V

0.1µF

WIMA

MKS2

100µF

50V

United Chemcon SXE

50 100 150 200 250 300 350

Figure 6. Self Contained Voltage Doubler

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June 2007

Micrel, Inc.

MIC4421A/4422A

V_IN+18V

Input Stage

The input voltage level of the MIC4421A changes the

quiescent supply current. The N-Channel MOSFET input

stage transistor drives a 320µA current source load. With

a logic “1” input, the quiescent supply current is typically

500µA. Logic “0” input level signals reduce quiescent

current to 80µA typical.

WIMA

MKS-2

1µF

+5.0V

+18V

TEK Current

Probe 6302

6, 7

MIC4421A

The MIC4421A/4422A input is designed to provide

600mV of hysteresis. This provides clean transitions,

reduces noise sensitivity, and minimizes output stage

current spiking when changing states. Input voltage

threshold level is approximately 1.5V, making the device

TTL compatible over the full temperature and operating

supply voltage ranges. Input current is less than ±10µA.

⁵0.1µF

Polycarbonate

0.1µF

2500pF

Logic

Ground

6 Amps

PC Trace

300mV

Power

Ground

The MIC4421A can be directly driven by the TL494,

SG1526/1527, SG1524, TSC170, MIC38C42, and

similar switch mode power supply integrated circuits. By

off loading the power-driving duties to the MIC4421A/

4422A, the power supply controller can operate at lower

dissipation. This can improve performance and reliability.

Figure 7. Switching Time Due to Negative Feedback

The supply current vs. frequency and supply current vs.

capacitive load characteristic curves aid in determining

power dissipation calculations. Table

lists the

The input can be greater than the V_Ssupply, however,

current will flow into the input lead. The input currents

can be as high as 30mA p-p (6.4mARMS) with the input.

No damage will occur to MIC4421A/4422A however, and

it will not latch.

maximum safe operating frequency for several power

supply voltages when driving a 10,000pF load. More

accurate power dissipation figures can be obtained by

summing the three dissipation sources.

Given the power dissipation in the device, and the

thermal resistance of the package, junction operating

temperature for any ambient is easy to calculate. For

example, the thermal resistance of the 8-pin plastic DIP

package, from the data sheet, is 84.6°C/W. In a 25°C

ambient, then, using a maximum junction temperature of

150°C, this package will dissipate 1478mW.

The input appears as a 7pF capacitance and does not

change even if the input is driven from an AC source.

While the device will operate and no damage will occur

up to 25V below the negative rail, input current will

increase up to 1mA/V due to the clamping action of the

input, ESD diode, and 1kꢀ resistor.

Accurate power dissipation numbers can be obtained by

summing the three sources of power dissipation in the

device:

Power Dissipation

CMOS circuits usually permit the user to ignore power

dissipation. Logic families such as 4000 and 74C have

outputs which can only supply a few milliamperes of

current, and even shorting outputs to ground will not

force enough current to destroy the device. The

MIC4421A/4422A on the other hand, can source or sink

several amperes and drive large capacitive loads at high

frequency. The package power dissipation limit can

easily be exceeded. Therefore, some attention should be

given to power dissipation when driving low impedance

loads and/or operating at high frequency.

•

Load Power Dissipation (PL)

Quiescent power dissipation (PQ)

Transition power dissipation (PT)

Calculation of load power dissipation differs depending

on whether the load is capacitive, resistive or inductive.

Resistive Load Power Dissipation

Dissipation caused by a resistive load can be calculated

as:

P_L= I²R_OD

where:

I =

the current drawn by the load

R_O=

the output resistance of the driver when

the output is high, at the power supply

voltage used. (See data sheet)

D =

fraction of time the load is conducting

(duty cycle).

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June 2007

Micrel, Inc.

MIC4421A/4422A

Table 1. MIC4421A Maximum Operating Frequency

Quiescent Power Dissipation

Quiescent power dissipation (PQ, as described in the

input section) depends on whether the input is high or

low. A low input will result in a maximum current drain

(per driver) of ≤0.2mA; a logic high will result in a current

drain of ≤3.0mA.

V_S

Max Frequency

220kHz

18V

15V

10V

300kHz

640kHz

2MHz

Quiescent power can therefore be found from:

P_Q= V_S[D I_H+ (1 – D) I_L]

where:

Conditions:

1. _JA= 150°C/W

2. T_A= 25°C

I_H=

I_L=

Quiescent current with input high

Quiescent current with input low

Fraction of time input is high (duty cycle)

Power supply voltage

3. C_L= 10,000pF

Capacitive Load Power Dissipation

D =

V_S=

Dissipation caused by a capacitive load is simply the

energy placed in, or removed from, the load capacitance

by the driver. The energy stored in a capacitor is

described by the equation:

Transition Power Dissipation

Transition power is dissipated in the driver each time its

output changes state, because during the transition, for

a very brief interval, both the N- and P-Channel

MOSFETs in the output totem-pole are ON

simultaneously, and a current is conducted through them

from V_Sto ground. The transition power dissipation is

approximately:

E = 1/2 C V²

As this energy is lost in the driver each time the load is

charged or discharged, for power dissipation calculations

the 1/2 is removed. This equation also shows that it is

good practice not to place more voltage in the capacitor

than is necessary, as dissipation increases as the

square of the voltage applied to the capacitor. For a

driver with a capacitive load:

P_T= 2 f V_S(A•s)

where (A•s) is a time-current factor derived from the

typical characteristic curve “Crossover Energy vs.

Supply Voltage.”

PL = f C (VS)2

where:

Total power (P_D) then, as previously described is just:

P_D= P_L+ P_Q+ P_T

f =

Operating Frequency

Load Capacitance

C =

VS = Driver Supply Voltage

Definitions

C_L=

D =

Load Capacitance in Farads.

Inductive Load Power Dissipation

Duty Cycle expressed as the fraction of time

the input to the driver is high.

For inductive loads the situation is more complicated.

For the part of the cycle in which the driver is actively

forcing current into the inductor, the situation is the same

as it is in the resistive case:

f =

Operating Frequency of the driver in Hertz.

I_H=

Power supply current drawn by a driver

when both inputs are high and neither output

is loaded.

_L1= I²R_OD

However, in this instance the R_Orequired may be either

the on-resistance of the driver when its output is in the

high state, or its on-resistance when the driver is in the

low state, depending on how the inductor is connected,

and this is still only half the story. For the part of the

cycle when the inductor is forcing current through the

driver, dissipation is best described as:

I_L=

Power supply current drawn by a driver

when both inputs are low and neither output

is loaded.

I_D=

Output current from a driver in Amps.

P_D=

P_L=

Total power dissipated in a driver in Watts.

Power dissipated in the driver due to the

driver’s load in Watts.

P_L2= I V_D(1 – D)

where V_Dis the forward drop of the clamp diode in the

driver (generally around 0.7V). The two parts of the load

dissipation must be summed in to produce P_L:

P_Q=

Power dissipated in a quiescent driver in

Watts.

P_L= P _L1+ P _L2

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June 2007

Micrel, Inc.

P_T=

MIC4421A/4422A

+18V

Power dissipated in a driver when the output

changes states (“shoot-through current”) in

Watts. NOTE: The “shoot-through” current

from a dual transition (once up, once down)

for both drivers is stated in Figure 7 in

ampere-nanoseconds. This figure must be

multiplied by the number of repetitions per

second (frequency) to find Watts.

WIMA

MK22

1µF

+5.0V

+18V

TEK Current

Probe 6302

6, 7

MIC4421A

R_O=

Output resistance of a driver in Ohms.

0.1µF

10,000pF

Polycarbonate

V_S= Power supply voltage to the IC in Volts.

Figure 8. Peak Output Current Test Circuit

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June 2007

Micrel, Inc.

MIC4421A/4422A

Package Information

PIN 1

DIMENSIONS:

INCH (MM)

0.380 (9.65)

0.370 (9.40)

0.255 (6.48)

0.245 (6.22)

0.135 (3.43)

0.125 (3.18)

0.300 (7.62)

0.013 (0.330

0.010 (0.254

0.380 (9.65)

0.320 (8.13)

0.018 (0.57)

0.100 (2.54)

0.130 (3.30)

0.0375 (0.952)

8-Pin Plastic DIP (N)

8-Pin SOIC (M)

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June 2007

Micrel, Inc.

MIC4421A/4422A

5-Pin TO-220 (T)

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.

M9999-062707

June 2007

MIC4421ACMTR [MICROCHIP]

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