MIC4421AAM - Micrel Semiconductor, Inc.

MIC4421A/4422A Micrel

October 2002 1 MIC4421A/4422A

MIC4421A/4422A

9A Peak Low-Side MOSFET Driver

Bipolar/CMOS/DMOS Process

General Description

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.

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

the largest MOSFETs with an improved safe operating mar-

gin. The MIC4421A/4422A accepts any logic input from

2.4V to VS without external speed-up capacitors or resistor

networks. Proprietary circuits allow the input to swing nega-

tive by as much as 5V without damaging the part. Additional

circuits protect against damage from electrostatic discharge.

MIC4421A/4422A drivers can replace three or more dis-

crete components, reducing PCB area requirements, simpli-

fying product design, and reducing assembly cost.

Modern Bipolar/CMOS/DMOS construction guarantees free-

dom from latch-up. The rail-to-rail swing capability of CMOS/

DMOS insures adequate gate voltage to the MOSFET dur-

ing 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.

Features

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

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

• Minimum pulse width: 50ns

• 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 VS

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

• Low supply current: 500µA (typ.)

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

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

T ypical Application

Off

VS OUT

OUT

MIC4421A

1µF

Si9410DY*

N-Channel

MOSFET

Load

V oltage†

Load

0.1µFVS

GNDIN

2 4,5

+15V

0.1µF

* Siliconix 30m

Ω

, 7A max.

†

Load voltage limited by MOSFET drain-to-source rating

Low-Side Power Switch

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

MIC4421A/4422A Micrel

MIC4421A/4422A 2 October 2002

Pin Configurations

OUT

GND

Plastic DIP (N)

SOIC (M)

TAB

5 OUT

4 GND

3VS

2 GND

1IN

TO-220-5 (T)

Pin Description

Pin Number Pin Number Pin Name Pin Function

TO-220-5 DIP, SOIC

1 2 IN Control Input.

2, 4 4, 5 GND Ground: Duplicate pins must be externally connected together.

3, TAB 1, 8 VS Supply Input: Duplicate pins must be externally connected together.

5 6, 7 OUT Output: Duplicate pins must be externally connected together.

3 NC Not connected.

Ordering Information

Part Number Configuration Temperature Range Package

MIC4421AAM* Inverting –55°C to +125°C 8-Pin SOIC

MIC4421ABM Inverting –40°C to +85°C 8-Pin SOIC

MIC4421ACM Inverting 0°C to +70°C 8-Pin SOIC

MIC4421ABN Inverting –40°C to +85°C 8-Pin PDIP

MIC4421ACN Inverting 0°C to +70°C 8-Pin PDIP

MIC4421ACT Inverting 0°C to +70°C 5-Pin TO-220

MIC4422AAM* Non-Inverting –55°C to +125°C 8-Pin SOIC

MIC4422ABM Non-Inverting –40°C to +85°C 8-Pin SOIC

MIC4422ACM Non-Inverting 0°C to +70°C 8-Pin SOIC

MIC4422ABN Non-Inverting –40°C to +85°C 8-Pin PDIP

MIC4422ACN Non-Inverting 0°C to +70°C 8-Pin PDIP

MIC4422ACT Non-Inverting 0°C to +70°C 5-Pin TO-220

*Special order. Contact factory.

MIC4421A/4422A Micrel

October 2002 3 MIC4421A/4422A

Electrical Characteristics

TA = 25°C with 4.5 V ≤ VS ≤ 18V, bold values indicate –55°C ≤ TA ≤ +125°C; unless noted

Symbol Parameter Condition Min Typ Max Units

Power Supply

VSOperating Input Voltage 4.5 18 V

ISHigh Output Quiescent Current VIN = 3V (MIC4422A), VIN = 0 (MIC4421A) 0.5 1.5 mA

3mA

Low Output Quiescent Current VIN = 0V (MIC4422A), VIN = 3V (MIC4421A) 50 150 µA

200 µA

Input

VIH Logic 1 Input Voltage See Figure 3 3.0 2.1 V

VIL Logic 0 Input Voltage See Figure 3 1.5 0.8 V

VIN Input Voltage Range –5 VS+0.3 V

IIN Input Current 0 V ≤ VIN ≤ VS–10 10 µA

Output

VOH High Output Voltage See Figure 1 VS–.025 V

VOL Low Output Voltage See Figure 1 0.025 V

ROOutput Resistance, IOUT = 10 mA, VS = 18 V 0.6 1.0 Ω

Output High 3.6 Ω

ROOutput Resistance, IOUT = 10 mA, VS = 18 V 0.8 1.7 Ω

Output Low 2.7 Ω

IPK Peak Output Current VS = 18 V (See Figure 8) 9 A

IDC Continuous Output Current 2 A

IRLatch-Up Protection Duty Cycle ≤ 2% >1500 mA

Withstand Reverse Current t ≤ 300 µs, Note 5

Switching Time (Note 5)

tRRise Time Test Figure 1, CL = 10,000 pF 20 75 ns

120 ns

tFFall Time Test Figure 1, CL = 10,000 pF 24 75 ns

120 ns

tD1 Delay Time Test Figure 1 15 60 ns

80 ns

tD2 Delay Time Test Figure 1 35 60 ns

80 ns

Absolute Maximum Ratings (Note 1)

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

Control Input Voltage (VIN).............VS + 0.3V to GND – 5V

Control Input Current (VIN > VS) ...............................50 mA

Power Dissipation, TA ≤ 25°C, Note 4

PDIP (θJA) .........................................................1478mW

SOIC (θJA)...........................................................767mW

5-Pin TO-220 (θJA) ............................................1756mW

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

Lead Temperature (10 sec)....................................... 300°C

ESD Rating, Note 3 ......................................................2kV

Operating Ratings (Note 2)

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

Ambient Temperature (TA)..................................................

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

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

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

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

Package Thermal Resistance, Note 4

8-Pin PDIP (θJA)...............................................84.6°C/W

8-Pin SOIC (θJA) ............................................163.0°C/W

5-Pin TO-220 (θJA) ...........................................71.2°C/W

8-Pin PDIP (θJC)...............................................41.2°C/W

8-Pin SOIC (θJC) ..............................................38.8°C/W

5-Pin TO-220 (θJC).............................................6.5°C/W

MIC4421A/4422A Micrel

MIC4421A/4422A 4 October 2002

MIC4421A 10,000pF

= 18V

0.1µF 4.7µF

0.1µF

OUT

tD1

90%

10%

tD2 tR

OUTPUT

INPUT 90%

tPW ≥ 50ns

2.5V

tPW

Figure 1. Inverting Driver Switching Time

Test Circuits

MIC4422A 10,000pF

= 18V

0.1µF 4.7µF

0.1µF

OUT

90%

10%

OUTPUT

INPUT 90%

tPW ≥ 50ns

tD1 tD2

tPW

2.5V

Figure 2. Noninverting Driver Switching Time

Symbol Parameter Condition Min Typ Max Units

Switching Time (Note 5)

tPW Minimum Input Pulse Width See Figure 1. and Figure 2. 50 ns

fmax Maximum Input Frequency See Figure 1. and Figure 2. 1 MHz

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. Human body model, 1.5k in series with 100pF.

Note 4. Minimum footprint.

Note 5. Guaranteed by design.

Control Input Behavior

Logic 1

Logic 0

Guaranteed

VIH

Typical

VIH

Guaranteed

VIL

Typical

VIL

0.8V

1.5V0V 2.1V VS

Figure 3. Input Hysteresis

MIC4421A/4422A Micrel

October 2002 5 MIC4421A/4422A

4 6 8 1012141618

220

200

180

160

140

120

100

SUPPLY VOLTAGE (V)

RISE TIME (ns)

Rise Time

vs. Supply Voltage

22,000pF

10,000pF

47,000pF

4 6 8 1012141618

220

200

180

160

140

120

100

SUPPLY VOLTAGE (V)

FALL TIME (ns)

Fall Time

vs. Supply Voltage

22,000pF

10,000pF

47,000pF

TEMPERATURE (°C)

TIME (ns)

Rise and Fall Times

vs. Temperature

-40 0 40 80 120

= 10,000pF

= 18V

FALL

RISE

100 1000 10k 100k

300

250

200

150

100

CAPACITIVE LOAD (pF)

RISE TIME (ns)

Rise Time

vs. Capacitive Load

18V

10V

100 1000 10k 100k

300

250

200

150

100

CAPACITIVE LOAD (pF)

FALL TIME (ns)

Fall Time

vs. Capacitive Load

18V

10V

4 6 8 1012141618

-7

-8

-9

VOLTAGE (V)

CROSSOVER ENERGY (A•s)

Crossover Energy

vs. Supply Voltage

PER TRANSITION

100 1000 10k 100k

CAPACITIVE LOAD (pF)

SUPPLY CURRENT (mA)

Supply Current

vs. Capacitive Load

= 5V

50kHz

1 MHz

200kHz

100 1000 10k 100k

220

160

100

CAPACITIVE LOAD (pF)

SUPPLY CURRENT (mA)

Supply Current

vs. Capacitive Load

120

140

180

200 V

= 18V

50kHz

200kHz

1 MHz

100 1000 10k 100k

150

CAPACITIVE LOAD (pF)

SUPPLY CURRENT (mA)

Supply Current

vs. Capacitive Load

120

= 12V

50kHz

1 MHz

200kHz

Typical Characteristics

10k 100k 1M 10M

120

100

FREQUENCY (Hz)

SUPPLY CURRENT (mA)

Supply Current

vs. Frequency

= 12V

0.1µF

0.01µF

1000pF

10k 100k 1M 10M

FREQUENCY (Hz)

SUPPLY CURRENT (mA)

Supply Current

vs. Frequency

= 5V

0.1µF

0.01µF

1000pF

10k 100k 1M 10M

180

160

100

FREQUENCY (Hz)

SUPPLY CURRENT (mA)

Supply Current

vs. Frequency

120

140

= 18V

0.1µF

0.01µF

1000pF

MIC4421A/4422A Micrel

MIC4421A/4422A 6 October 2002

4 6 8 1012141618

SUPPLY VOLTAGE (V)

TIME (ns)

Propagation Delay

vs. Supply Voltage

0246810

120

110

100

INPUT (V)

TIME (ns)

Propagation Delay

vs. Input Amplitude

= 10V

-40 0 40 80 120

1000

100

TEMPERATURE (°C)

QUIESCENT SUPPLY CURRENT (µA)

Quiescent Supply Current

vs. Temperature

INPUT = 0

INPUT = 1

= 18V

4 6 8 1012141618

2.4

2.2

2.0

1.4

1.2

1.0

0.8

0.6

0.4

0.2

SUPPLY VOLTAGE (V)

HIGH-STATE OUTPUT RESISTANCE (Ω)

High-State Output Resist.

vs. Supply Voltage

1.6

1.8

= 25°C

= 150°C

4 6 8 1012141618

2.4

2.2

2.0

1.4

1.2

1.0

0.8

0.6

0.4

0.2

SUPPLY VOLTAGE (V)

LOW-STATE OUTPUT RESISTANCE (Ω)

Low-State Output Resist.

vs. Supply Voltage

1.6

1.8

= 25°C

= 150°C

-40 0 40 80 120

TEMPERATURE (°C)

TIME (ns)

Propagation Delay

vs. Temperature

MIC4421A/4422A Micrel

October 2002 7 MIC4421A/4422A

Functional Description

Refer to the functional diagram.

The MIC4422A is a noninverting 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.

Supply

VS (supply) is rated for +4.5V to +18V. External capacitors are

recommended to decouple noise.

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.

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.

Hysteresis

The control threshold voltage, when IN is rising, is slightly

higher than the control threshold voltage when CTL is falling.

When IN is low, Q2 is on, which applies the additional 0.3mA

current source to Q1. Forcing IN high turns on Q1 which must

sink 0.4mA from the two current sources. The higher current

Functional Diagram

OUT

MIC4421A

INVERTING

MIC4422A

NONINVERTING

0.1mA 0.3mA

2kΩ

GND

Figure 4. MIC4421A/22A Block Diagram

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.

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.

Drivers

The second (optional) inverter permits the driver to be manu-

factured in inverting and noninverting versions.

The last inverter functions as a driver for the output MOSFETs

Q3 and Q4.

Output

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

voltage) is either approximately the supply voltage or ap-

proximately ground, depending on the logic state applied to

IN.

If IN is high, and VS (supply) drops to zero, the output will be

floating (unpredictable).

MIC4421A/4422A Micrel

MIC4421A/4422A 8 October 2002

Applications 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.

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.

Figure 6. Self Contained Voltage Doubler

VOLTS

Output Voltage

vs. Load Current

0 50 100 150 200 250 300 350

12 LINE

MIC4422A

+15V

0.1µF

50V

United Chemcon SXE

0.1µF

WIMA

MKS2

1µF

WIMA

MKS2 BYV 10

(x2)

100µF

50V

500µF

50V

5.6kΩ

560kΩ

1N4448

(x2)

To guarantee low supply impedance over a wide frequency

range, a parallel capacitor combination is recommended for

supply bypassing. Low inductance ceramic disk capacitors

with 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.

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 switch-

ing 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.

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

0.05Ω 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.

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.

1µF

MIC4421A

Drive

Logic

MIC4422A

1µF

∅1 Drive Signal

Conduction Angle

Control 0°C to 180°C

Conduction Angle

Control 180°C to 360°C

∅1

∅2

∅3

Phase 1 of 3 Phase Motor

Driver Using MIC4421A/22A

Figure 5. Direct Motor Drive

MIC4421A/4422A Micrel

October 2002 9 MIC4421A/4422A

Table 1: MIC4421A Maximum Operating Frequency

VSMax Frequency

18V 220kHz

15V 300kHz

10V 640kHz

5V 2MHz

Conditions:

1. θJA = 150°C/W

2. TA = 25°C

3. CL = 10,000pF

The supply current vs. frequency and supply current vs.

capacitive load characteristic curves aid in determining

power dissipation calculations. Table 1 lists the maximum

safe operating frequency for several power supply voltages

when driving a 10,000pF load. More accurate power dissi-

pation 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.

Accurate power dissipation numbers can be obtained by

summing the three sources of power dissipation in the

device:

• 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:

PL = I2 RO D

where:

I = the current drawn by the load

RO = 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).

MIC4421A

VIN +18V

0.1µF

86, 7

40.1µF2500pF

Polycarbonate

TEK Current

Probe 6302

Logic

Ground

Power

Ground

300mV 6 Amps

PC Tr ace

Resistance = 0.05Ω

+18V

+5.0V

WIMA

MKS-2

1µF

Figure 7. Switching Time Degradation Due to

Negative Feedback

Input Stage

The input voltage level of the MIC4421A changes the quies-

cent 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.

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 approxi-

mately 1.5V, making the device TTL compatible over the full

temperature and operating supply voltage ranges. Input

current is less than ±10µA.

The MIC4421A can be directly driven by the TL494, SG1526/

1527, SG1524, TSC170, MIC38C42, and similar switch

mode power supply integrated circuits. By offloading the

power-driving duties to the MIC4421A/4422A, the power

supply controller can operate at lower dissipation. This can

improve performance and reliability.

The input can be greater than the VS supply, 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.

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 1kΩ resistor.

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.

MIC4421A/4422A Micrel

MIC4421A/4422A 10 October 2002

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 VS to ground. The transition

power dissipation is approximately:

PT = 2 f VS (A•s)

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

characteristic curve “Crossover Energy vs. Supply Voltage.”

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

PD = PL + PQ + PT

Definitions

CL = Load Capacitance in Farads.

D = Duty Cycle expressed as the fraction of time the

input to the driver is high.

f = Operating Frequency of the driver in Hertz.

IH = Power supply current drawn by a driver when both

inputs are high and neither output is loaded.

IL = Power supply current drawn by a driver when both

inputs are low and neither output is loaded.

ID = Output current from a driver in Amps.

PD = Total power dissipated in a driver in Watts.

PL = Power dissipated in the driver due to the driver’s

load in Watts.

PQ = Power dissipated in a quiescent driver in Watts.

PT = 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 repeti-

tions per second (frequency) to find Watts.

RO = Output resistance of a driver in Ohms.

VS = Power supply voltage to the IC in Volts.

Capacitive Load Power Dissipation

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:

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:

PL = f C (VS)2

where:

f = Operating Frequency

C = Load Capacitance

VS = Driver Supply Voltage

Inductive Load Power Dissipation

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:

PL1 = I2 RO D

However, in this instance the RO required 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:

PL2 = I VD (1 – D)

where VD is 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 PL:

PL = PL1 + PL2

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.

Quiescent power can therefore be found from:

PQ = VS [D IH + (1 – D) IL]

where:

IH = Quiescent current with input high

IL = Quiescent current with input low

D = Fraction of time input is high (duty cycle)

VS = Power supply voltage

MIC4421A/4422A Micrel

October 2002 11 MIC4421A/4422A

MIC4421A

+18V

0.1µF

86, 7

0.1µF10,000pF

Polycarbonate

TEK Current

Probe 6302

+18V

+5.0V

WIMA

MK22

1µF

Figure 8. Peak Output Current Test Circuit

MIC4421A/4422A Micrel

MIC4421A/4422A 12 October 2002

Package Information

0.380 (9.65)

0.370 (9.40)

0.135 (3.43)

0.125 (3.18)

PIN 1

DIMENSIONS:

INCH (MM)

0.018 (0.57)

0.100 (2.54)

0.013 (0.330)

0.010 (0.254)

0.300 (7.62)

0.255 (6.48)

0.245 (6.22)

0.380 (9.65)

0.320 (8.13)

0.0375 (0.952)

0.130 (3.30)

8-Pin Plastic DIP (N)

45°

0°–8°

0.244 (6.20)

0.228 (5.79)

0.197 (5.0)

0.189 (4.8) SEATING

PLANE

0.026 (0.65)

MAX)

0.010 (0.25)

0.007 (0.18)

0.064 (1.63)

0.045 (1.14)

0.0098 (0.249)

0.0040 (0.102)

0.020 (0.51)

0.013 (0.33)

0.157 (3.99)

0.150 (3.81)

0.050 (1.27)

TYP

PIN 1

DIMENSIONS:

INCHES (MM)

0.050 (1.27)

0.016 (0.40)

8-Pin SOIC (M)

MIC4421A/4422A Micrel

October 2002 13 MIC4421A/4422A

0.018 ±0.008

(0.46 ±0.20)

0.268 REF

(6.81 REF)

0.032 ±0.005

(0.81 ±0.13)

0.550 ±0.010

(13.97 ±0.25)

7°

Typ.

SEATING

PLANE

0.578 ±0.018

(14.68 ±0.46)

0.108 ±0.005

(2.74 ±0.13)

0.050 ±0.005

(1.27 ±0.13)

0.150 D ±0.005

(3.81 D ±0.13)

0.400 ±0.015

(10.16 ±0.38)

0.177 ±0.008

(4.50 ±0.20)

0.103 ±0.013

(2.62±0.33)

0.241 ±0.017

(6.12 ±0.43)

0.067 ±0.005

(1.70 ±0.127)

inch

(mm)

Dimensions:

5-Lead TO-220 (T)

MICREL, INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA

TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB http://www.micrel.com

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.