Datasheet MIC5236-3.3BMM, MIC5236-5.0BM, MIC5236-5.0BMM, MIC5236-3.0BMM, MIC5236-3.0BM Datasheet (MICREL)

MIC5236 Micrel

C

OUT

V

OUT

3.0V/150mA

V

IN

5V

V

ERR

IN

MIC5236

EN

47k

OUT

GND

ERR

MIC5236

Low Quiescent Current µCap LDO Regulator

Preliminary Information

General Description

The MIC5236 is a low quiescent current, µCap low-dropout
regulator. With a maximum operating input voltage of 30V
and a quiescent current of 20µA, it is ideal for supplying keep­alive power in systems with high-voltage batteries.

Capable of 150mA output, the MIC5236 has a dropout
voltage of only 300mV. It can also survive an input transient
of –20V to +60V.

As a µCap LDO, the MIC5236 is stable with either a ceramic
or a tantalum output capacitor. It only requires a 1.0µF output
capacitor for stability.

The MIC5236 includes a logic compatible enable input and an
undervoltage error flag indicator. Other features of the
MIC5236 include thermal shutdown, current-limit, overvolt­age shutdown, load-dump protection, reverse leakage pro­tections, and reverse battery protection.

Available in the thermally enhanced SOP-8 and MSOP-8, the
MIC5236 comes in fixed 2.5V, 3.0V, 3.3V, 5.0V, and adjust­able voltages. For other output voltages, contact Micrel.

Features

• Ultra-low quiescent current (IQ = 20µA @IO = 100µA)

• Wide input range: 2.3V to 30V

• Low dropout:

230mV @50mA;
300mV @150mA

• Fixed 2.5V, 3.0V, 3.3V, 5.0V, and Adjustable outputs

• ±1.0% initial output accuracy

• Stable with ceramic or tantalum output capacitor

• Load dump protection: –20V to +60V input transient

survivability

• Logic compatible enable input

• Low output flag indicator

• Overcurrent protection

• Thermal shutdown

• Reverse-leakage protection

• Reverse-battery protection

• High-power SOP-8 and MSOP-8

Applications

• Keep-alive supply in notebook and
portable personal computers

• Logic supply from high-voltage batteries

• Automotive electronics

• Battery-powered systems

Typical Application

V

30V

IN

MIC5236

IN

EN

GND

OUT

ERR

Regulator with Low IO and Low I

November 2000 1 MIC5236

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 [phone] • fax + 1 [phone] • http://www.micrel.com

V

5V

IN

V

OUT

3.0V/100µA
I

= 20µA

GND

Q

MIC5236

IN

EN

OUT

ADJ

GND

Regulator with Adjustable Output

Regulator with Error Output

V

OUT

3.0V/150mA

MIC5236 Micrel

Ordering Information

Part Number * Voltage Junction Temp. Range Package

MIC5236-5.0BM 5.0V –40°C to +125°C 8-lead SOIC
MIC5236-5.0BMM 5.0V –40°C to +125°C 8-lead MSOP
MIC5236-3.3BM 3.3V –40°C to +125°C 8-lead SOIC
MIC5236-3.3BMM 3.3V –40°C to +125°C 8-lead MSOP
MIC5236-3.0BM 3.0V –40°C to +125°C 8-lead SOIC
MIC5236-3.0BMM 3.0V –40°C to +125°C 8-lead MSOP
MIC5236-2.5BM 2.5V –40°C to +125°C 8-lead SOIC
MIC5236-2.5BMM 2.5V –40°C to +125°C 8-lead MSOP
MIC5236BM ADJ –40°C to +125°C 8-lead SOIC
MIC5236BMM ADJ –40°C to +125°C 8-lead MSOP

*Conta5ct factory regarding availablity for voltages not listed

Pin Configuration

ERR

IN

OUT

EN

1
2
3
4

8-Pin SOIC (M)

8-Pin MSOP (MM)

8 GND

GND

7

GND

6

GND

5

ADJ

IN

OUT

EN

1
2
3
4

8-Pin SOIC (M)

8-Pin MSOP (MM)

Pin Description

Pin Number Pin Number Pin Name Pin Function

1 /ERR Error (Output): Open-collector output is active low when the output is out of

regulation due to insufficient input voltage or excessive load. An external

pull-up resistor is required.
1 ADJ Adjustable Feedback Input. Connect to voltage divider network.
2 2 IN Power supply input.
3 3 OUT Regulated Output
4 4 EN Enable (Input): Logic low = shutdown; logic high = enabled.

5–85–8 GND Ground: Pins 5, 6, 7, and 8 are internally connected in common via the

leadframe.

8 GND

GND

7

GND

6

GND

5

MIC5236 2 November 2000

MIC5236 Micrel

Absolute Maximum Ratings (Note 1)

Supply Voltage (V
Power Dissipation (P
Junction Temperature (T

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

Lead Temperature (soldering, 5 sec.) ....................... 260°C

), Note 3 ........................ –20V to +60V

IN

), Note 4 ............... Internally Limited

D

) ......................................+150°C

J

Operating Ratings (Note 2)

Supply Voltage (V
Junction Temperature (T
Package Thermal Resistance

MSOP (θ

JA

SOIC (θJA)...........................................................63°C/W

) ................................... + 2.3V to +30V

IN

) .......................–40°C to +125°C

J

) .........................................................80°C/W

ESD Rating, Note 5

Electrical Characteristics

VIN = 6.0V; VEN = 2.0V; C

Symbol Parameter Conditions Min Typ Max Units

V

OUT

/∆T Output Voltage Note 6 50 ppm/°C

∆V

OUT

∆V

OUT/VOUT

∆V

OUT/VOUT

Output Voltage Accuracy variation from nominal V

Temperature Coefficient
Line Regulation VIN = V

Load Regulation I

∆V Dropout Voltage, Note 8 I

I

GND

I

GND(SHDN)

I

SC

e

n

Ground Pin Current VEN ≥ 2.0V, I

Ground Pin in Shutdown VEN ≤ 0.6V, V
Short Circuit Current V
Output Noise 10Hz to 100kHz, V

/ERR Output

V

/ERR

Low Threshold % of V
High Threshold % of V

V

OL

I

LEAK

/ERR Output Low Voltage VIN = V

/ERR Output Leakage VOH = 30V 0.1 1 µA

Enable Input

V

IL

V

IH

Input Low Voltage regulator off 0.6 V
Input High Voltage regulator on 2.0 V

= 4.7µF, I

OUT

= 100µA; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C; unless noted.

OUT

OUT

+ 1V to 30V 0.2 0.5 %

OUT

= 100µA to 50mA, Note 7 0.15 0.3 %

OUT

I

= 100µA to 150mA, Note 7 0.3 0.6 %

OUT

= 100µA50100 mV

OUT

I

= 50mA 230 400 mV

OUT

I

= 100mA 270 mV

OUT

I

= 150mA 300 500 mV

OUT

= 100µA2030 µA

OUT

VEN ≥ 2.0V, I
VEN ≥ 2.0V, I
V

≥ 2.0V, I

EN

= 0V 260 350 mA

OUT

OUT
OUT

OUT(nom)

= 50mA 0.5 0.8 mA

OUT

= 100mA 1.5 mA

OUT

= 150mA 2.8 4.0 mA

OUT

= 30V 0.1 1 µA

IN

= 3.0V, CL = 1.0µF 160 µVrms

OUT

– 0.12V

, IOL = 200µA 150 250 mV

OUT

–11%

–2+2%

90 94 %

1.0 %

0.5 %

1.0 %

5.0 mA

95 98 %

400 mV

2 µA

November 2000 3 MIC5236

MIC5236 Micrel

Symbol Parameter Conditions Min Typ Max Units

I

IN

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: The absolute maximum positive supply voltage (60V) must be of limited duration (≤100ms) and duty cycle (≤1%). The maximum continuous

Note 4: The maximum allowable power dissipation of any T

Note 5. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
Note 6: Output voltage temperature coefficient is defined as the worst-case voltage change divided by the total temperature range.
Note 7: Regulation is measured at constant junction temperature using pulse testing with a low duty-cycle. Changes in output voltage due to heating

Note 8: Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1.0V

Enable Input Current VEN = 0.6V, regulator off 0.01 1.0 µA

2.0 µA

V

= 2.0V, regulator on 0.15 1.0 µA

EN

2.0 µA

V

= 30V, regulator on 0.5 2.5 µA

EN

supply voltage is 30V.

(ambient temperature) is P
allowable power dissipation will result in excessive die termperature, and the regulator will go into thermal shutdown. The θ
MIC5236-x.xBM (all versions) is 63°C/W, and the MIC5236-x.xBMM (all versions) is 80°C/W, mounted on a PC board (see “Thermal Charac­teristics” for further details).

effects are covered by the specification for thermal regulation.

differential.

A

D(max)

= (T

– TA) ÷ θJA. Exceeding the maximum

J(max)

5.0 µA

of the

JA

MIC5236 4 November 2000

MIC5236 Micrel

1.0

1.5

2.0

2.5

3.0

3.5

1.5 2.0 2.5 3.0 3.5 4.0

OUTPUT VOLTAGE (V)

SUPPLY VOLTAGE (V)

0

5

10

15

20

25

0 100 200 300 400 500

GROUND PIN CURRENT (µA)

OUTPUT CURRENT (µA)

)

g

0

0.02

0.04

0.06

0.08

0.10

-40 -20 0 20 40 60 80 100 120

GROUND CURRENT (mA)

TEMPERATURE (°C)

2.985

2.990

2.995

3.000

3.005

3.010

3.015

-40 -20 0 20 40 60 80 100 120

VOLTAGE OUTPUT (V)

TEMPERATURE (°C)

Typical Characteristics

Dropout Voltage

vs. Output Current

400

300

200

100

V

= 98% of Nominal V

OUT

DROPOUT VOLTAGE (mV)

MIC5236-3.0

0

0 40 80 120 160 200

OUTPUT CURRENT (mA)

Ground Current

vs. Output Current

4

MIC5236-3.0

3

= 4V

2

1

GROUND PIN CURRENT (mA)

0

0 20 40 60 80 100120 140160

V

IN

OUTPUT CURRENT (mA)

Dropout Characteristics

600

500

400

300

200

100

DROPOUT VOLTAGE (mV)

OUT

I

= 10mA

LOAD

I

= 50mA

LOAD

I

MIC5236-3.0

LOAD

I

LOAD

= 100mA

= 150mA

Ground Pin Current

vs. Output Current

VIN = 4V

VIN = 10V

= 10V

V

IN

MIC5236-3.0

GROUND CURRENT (mA)

Dropout Voltage
vs. Temperature

I

= 150mA

LOAD

MIC5236-3.0

0

-40 -20 0 20 40 60 80 100 120

TEMPERATURE (°C)

Ground Current

vs. Supply Voltage

5

MIC5236-3.0

4

3

V

= 3V

OUT

2

1

0

012345678

SUPPLY VOLTAGE (V)

I

LOAD

I

LOAD

= 150mA

= 100µA

100

90
80
70
60
50
40
30
20
10

GROUND PIN CURRENT (µA)

November 2000 5 MIC5236

GROUND CURRENT (mA)

Ground Current

vs. Supply Volta

0

012345678

SUPPLY VOLTAGE (V

e

MIC5236-3.0

I

= 10mA

LOAD

1mA

100µA

10µA

Ground Current

vs. Temperature

4

3

2

1

MIC5236-3.0

0

-40 -20 0 20 40 60 80 100 120

V

= 4V

IN

I

= 150mA

LOAD

TEMPERATURE (°C)

Ground Current

vs. Temperature

MIC5236-3.0

Output Voltage

vs. Temperature

MIC5236-3.0

V

IN

I

LOAD

VIN = 4V
I

LOAD

= 4V

= 10mA

= 150mA

Ground Current

1.2

1.0

0.8

0.6

0.4

0.2

GROUND CURRENT (mA)

vs. Temperature

= 4V

V

IN

I

= 75mA

LOAD

MIC5236-3.0

0

-40 -20 0 20 40 60 80 100120

TEMPERATURE (°C)

Short Circuit Current

285

280

275

270

265

260

255

SHORT CIRCUIT CURRENT (mA)

vs. Temperature

V

= 0V

OUT

MIC5236-3.0

-40 -20 0 20 40 60 80 100 120

TEMPERATURE (°C)

MIC5236 Micrel

3.018

Line Regulation

3.016

MIC5236-3.0

3.014

3.012

3.010

3.008

3.006

VOLTAGE OUTPUT (V)

3.004

3.002
0 5 10 15 20 25 30 35

INPUT VOLTAGE (V)

120

MIC5236-3.0

100

VEN = 5V

80

R

= 30Ω

L

60

40

20

INPUT CURRENT (mA)

0

-30 -20 -10 0 10

INPUT VOLTAGE (V)

I

LOAD

Input Current

= 10mA

Overvoltage Threshold

vs. Temperature

41

MIC5236-3.0

40

39

38

37

INPUT VOLTAGE (V)

36

-40 -20 0 20 40 60 80 100 120

TEMPERATURE (°C)

Dropout Induced

3.0

2.5

2.0

1.5

1.0

0.5

OUTPUT-LOW VOLTAGE (V)

0

0 0.5 1.0 1.5 2.0

Error Flag

MIC5236-3.0

VIN = 2.7V
V

=2.62V

OUT

No Load

SINK CURRENT (mA)

Current Limit

vs. Output Voltage

3.5

3.0

2.5

2.0

1.5

1.0

OUTPUT VOLTAGE (V)

0.5
MIC5236-3.0

0

0 100 200 300 400

CURRENT LIMIT (mA)

Current Limit Induced

1.25

1.00

0.75

0.50

0.25

OUTPUT-LOW VOLTAGE (V)

0

0 0.5 1.0 1.5 2.0 2.5 3.0

Error Flag

VIN = 6V
V

= 2.03V

OUT

R

= 6Ω

L

SINK CURRENT (mA)

MIC5236-3.0

Reverse Current

60

50

40

30

20

10

REVERSE CURRENT (µA)

0

(Open Input)

Note 10

-40°C

+25°C

+85°C

0 5 10 15 20

EXTERNAL VOLTAGE (V)

Note 10 Note 11

MIC5236

IN
EN

GND

OUT

Reverse
Current

Reverse Current

(Grounded Input)

70
60

Note 11

50
40
30
20
10

REVERSE CURRENT (µA)

0

0 5 10 15 20

EXTERNAL VOLTAGE (V)

MIC5236

IN
EN

GND

+25°C

OUT

-40°C

Reverse
Current

+85°C

MIC5236 6 November 2000

MIC5236 Micrel

Functional Characteristics

V

V

OUT

EN

Enable

Transient Response

(2V/div.)

(5V/div.)

TIME (250µs/div.)

VIN = 5V

= 10mA

I

L

V

I

OUT

(100mV/div.)

OUT

(100mA/div.)

Load

Transient Response

TIME (250µs/div.)

VIN = 4V

= 3V

V

OUT

= 15µF

C

OUT

ESR = 200mΩ

November 2000 7 MIC5236

MIC5236 Micrel

Functional Diagram

IN

EN

1.23V

MIC5236-x.x

OUT

R

FB1

Error

Amplifier

R

FB2

R

FB3

ERR

V

REF

Error

Comparator

GND

MIC5236 8 November 2000

MIC5236 Micrel

Application Information

The MIC5236 provides all of the advantages of the MIC2950:
wide input voltage range, load dump (positive transients up to
60V), and reversed-battery protection, with the added advan­tages of reduced quiescent current and smaller package.
Additionally, when disabled, quiescent current is reduced to

0.1µA.

Enable

A low on the enable pin disables the part, forcing the quies­cent current to less than 0.1µA. Thermal shutdown and the
error flag are not functional while the device is disabled. The
maximum enable bias current is 2µA for a 2.0V input. An open
collector pull-up resistor tied to the input voltage should be set
low enough to maintain 2V on the enable input. Figure 1
shows an open collector output driving the enable pin through
a 200k pull-up resistor tied to the input voltage.

In order to avoid output oscillations, slow transitions from low
to high should be avoided.

SHUTDOWN

ENABLE

V

5V

200k

IN

200k

MIC5236

IN

EN

GND

OUT

ERR

V

ERR

V

OUT

C

OUT

Error Detection Comparator Output

The ERR pin is an open collector output which goes low when
the output voltage drops 5% below it’s internally programmed
level. It senses conditions such as excessive load (current
limit), low input voltage, and over temperature conditions.
Once the part is disabled via the enable input, the error flag
output is not valid. Overvoltage conditions are not reflected in
the error flag output. The error flag output is also not valid for
input voltages less than 1.3V.

The error output has a low voltage of 400mV at a current of
200µA. In order to minimize the drain on the source used for
the pull-up, a value of 200k to 1MΩ is suggested for the error
flag pull-up. This will guarantee a maximum low voltage of

0.4V for a 30V pull-up potential. An unused error flag can be
left unconnected.

Error

4.75V

0V

VALID ERROR

NOT

VALID

NOT
VALID

Output

Voltage

Output

1.3V

5V

0V

Input

Voltage

Figure 3. Error Output Timing

Figure 1. Remote Enable

Input Capacitor

An input capacitor may be required when the device is not
near the source power supply or when supplied by a battery.
Small, surface mount, ceramic capacitors can be used for
bypassing. Larger values may be required if the source
supply has high ripple.

Output Capacitor

The MIC5236 has been designed to minimize the effect of the
output capacitor ESR on the closed loop stability. As a result,
ceramic or film capacitors can be used at the output. Figure 2
displays a range of ESR values for a 10µF capacitor. Virtually
any 10µF capacitor with an ESR less than 3.4Ω is sufficient
for stability over the entire input voltage range. Stability can
also be maintained throughout the specified load and line
conditions with 1µF film or ceramic capacitors.

5

4

3

2

1

OUTPUT CAPACITOR ESR (Ω)

0

5 1015202530

Stable Region

TJ = 25°C
V

= 10µF

OUT

INPUT VOLTAGE (V)

Figure 2. Output Capacitor ESR

Reverse Current Protection

The MIC5236 is designed to limit the reverse current flow
from output to input in the event that the MIC5236 output has
been tied to the output of another power supply. See the
graphs detailing the reverse current flow with the input
grounded and open.

Thermal Shutdown

The MIC5236 has integrated thermal protection. This feature
is only for protection purposes. The device should never be
intentionally operated near this temperature as this may have
detrimental effects on the life of the device. The thermal
shutdown may become inactive while the enable input is
transitioning a high to a low. When disabling the device via the
enable pin, transition from a high to low quickly. This will
insure that the output remains disabled in the event of a
thermal shutdown.

Current Limit

Figure 4 displays a method for reducing the steady state
short circuit current. The duration that the supply delivers
current is set by the time required for the error flag output to
discharge the 4.7µF capacitor tied to the enable pin. The off
time is set by the 200K resistor as it recharges the 4.7µF
capacitor, enabling the regulator. This circuit reduces the
short circuit current from 280mA to 15mA while allowing for
regulator restart once the short is removed.

November 2000 9 MIC5236

MIC5236 Micrel

a

1N4148

SHUTDOWN

ENABLE

200k

4.7µF

MIC5236

IN

EN

GND

OUT

ERR

V

IN

5V

200k

V

ERR

V

OUT

C

OUT

Figure 4. Remote Enable with Short-Circuit

Current Foldback

Thermal Characteristics

The MIC5236 is a high input voltage device, intended to
provide 150mA of continuous output current in two very small
profile packages. The power SOP-8 and power MSOP-8
allow the device to dissipate about 50% more power than
their standard equivalents.

Power SOP-8 Thermal Characteristics

One of the secrets of the MIC5236’s performance is its power
SO-8 package featuring half the thermal resistance of a
standard SO-8 package. Lower thermal resistance means
more output current or higher input voltage for a given
package size.

Lower thermal resistance is achieved by joining the four
ground leads with the die attach paddle to create a single­piece electrical and thermal conductor. This concept has
been used by MOSFET manufacturers for years, proving
very reliable and cost effective for the user.

Thermal resistance consists of two main elements, θ

JC

(junction-to-case thermal resistance) and θCA (case-to-ambi­ent thermal resistance). See Figure 5. θJC is the resistance
from the die to the leads of the package. θCA is the resistance
from the leads to the ambient air and it includes θCS (case-to­sink thermal resistance) and θSA (sink-to-ambient thermal
resistance).

SOP-8

θ

JA

θ

θ

JC

CA

printed circuit board

AMBIENT

ground plane

heat sink are

Figure 5. Thermal Resistance

Using the power SOP-8 reduces the θJC dramatically and
allows the user to reduce θCA. The total thermal resistance,

θJA (junction-to-ambient thermal resistance) is the limiting

factor in calculating the maximum power dissipation capabil­ity of the device. Typically, the power SOP-8 has a θJC of
20°C/W, this is significantly lower than the standard SOP-8
which is typically 75°C/W. θCA is reduced because pins 5

through 8 can now be soldered directly to a ground plane
which significantly reduces the case-to-sink thermal resis­tance and sink to ambient thermal resistance.

Low-dropout linear regulators from Micrel are rated to a
maximum junction temperature of 125°C. It is important not
to exceed this maximum junction temperature during opera­tion of the device. To prevent this maximum junction tempera­ture from being exceeded, the appropriate ground plane heat
sink must be used.

900
800

)

2

700
600
500
400
300
200

COPPER AREA (mm

100

0

0 0.25 0.50 0.75 1.00 1.25 1.50

40°C

50°C

55°C

65°C

75°C

85°C

POWER DISSIPATION (W)

100°C

Figure 6. Copper Area vs. Power-SOP

Power Dissipation (∆TJA)

Figure 6 shows copper area versus power dissipation with
each trace corresponding to a different temperature rise
above ambient.

From these curves, the minimum area of copper necessary
for the part to operate safely can be determined. The maxi­mum allowable temperature rise must be calculated to deter­mine operation along which curve.

∆T = T
T

J(max)

T

A(max)

– T

J(max)

A(max)

= 125°C

= maximum ambient operating temperature

For example, the maximum ambient temperature is 50°C, the

∆T is determined as follows:

∆T = 125°C – 50°C
∆T = 75°C

Using Figure 6, the minimum amount of required copper can
be determined based on the required power dissipation.
Power dissipation in a linear regulator is calculated as fol­lows:

PD = (VIN – V

OUT

) I

OUT

+ VIN· I

GND

If we use a 3V output device and a 28V input at moderate
output current of 25mA, then our power dissipation is as
follows:

PD = (28V – 3V) × 25mA + 28V × 250µA
PD = 625mW + 7mW
PD = 632mW

From Figure 6, the minimum amount of copper required to
operate this application at a ∆T of 75°C is 25mm2.

Quick Method

Determine the power dissipation requirements for the design
along with the maximum ambient temperature at which the
device will be operated. Refer to Figure 7, which shows safe
operating curves for three different ambient temperatures:
25°C, 50°C and 85°C. From these curves, the minimum

MIC5236 10 November 2000

MIC5236 Micrel

amount of copper can be determined by knowing the maxi­mum power dissipation required. If the maximum ambient
temperature is 50°C and the power dissipation is as above,
632mW, the curve in Figure 7 shows that the required area of
copper is 25mm2.

The θJA of this package is ideally 63°C/W, but it will vary
depending upon the availability of copper ground plane to
which it is attached.

900

TJ = 125°C

800

)

2

700
600
500
400
300
200

COPPER AREA (mm

100

0

85°C 50°C 25°C

0 0.25 0.50 0.75 1.00 1.25 1.50

POWER DISSIPATION (W)

Figure 7. Copper Area vs. Power-SOP

Power Dissipation (TA)

900
800

)

2

700
600
500
400
300
200

COPPER AREA (mm

100

0

40°C

50°C

55°C

65°C

75°C

100°C

85°C

0 0.25 0.50 0.75 1.00 1.25 1.50

POWER DISSIPATION (W)

Figure 8. Copper Area vs. Power-MSOP

Power Dissipation (∆TJA)

The same method of determining the heat sink area used for
the power-SOP-8 can be applied directly to the power­MSOP-8. The same two curves showing power dissipation
versus copper area are reproduced for the power-MSOP-8
and they can be applied identically, see Figures 8 and 9.

900

TJ = 125°C

800

)

2

700
600
500
400
300
200

COPPER AREA (mm

100

85°C 50°C 25°C

0

0 0.25 0.50 0.75 1.00 1.25 1.50

POWER DISSIPATION (W)

Figure 9. Copper Area vs. Power-MSOP

Power Dissipation (TA)

Power MSOP-8 Thermal Characteristics

The power-MSOP-8 package follows the same idea as the
power-SO-8 package, using four ground leads with the die
attach paddle to create a single-piece electrical and thermal
conductor, reducing thermal resistance and increasing power
dissipation capability.

Quick Method

Determine the power dissipation requirements for the design
along with the maximum ambient temperature at which the
device will be operated. Refer to Figure 9, which shows safe
operating curves for three different ambient temperatures,
25°C, 50°C, and 85°C. From these curves, the minimum
amount of copper can be determined by knowing the maxi­mum power dissipation required. If the maximum ambient
temperature is 50°C, and the power dissipation is 639mW,
the curve in Figure 9 shows that the required area of copper
is 110mm2,when using the power MSOP-8.

November 2000 11 MIC5236

MIC5236 Micrel

Package Information

0.026 (0.65)
MAX)

PIN 1

0.157 (3.99)

0.150 (3.81)

0.064 (1.63)

0.045 (1.14)

0.122 (3.10)

0.112 (2.84)

0.036 (0.90)

0.032 (0.81)

0.050 (1.27)
TYP

0.197 (5.0)

0.189 (4.8)

0.020 (0.51)

0.013 (0.33)

0.0098 (0.249)

0.0040 (0.102)

SEATING

PLANE

8-Lead SOIC (M)

0.199 (5.05)

0.187 (4.74)

0.120 (3.05)

0.116 (2.95)

0.043 (1.09)

0.038 (0.97)

DIMENSIONS:
INCHES (MM)

0°–8°

0.012 (0.30) R

45°

0.050 (1.27)

0.016 (0.40)

0.244 (6.20)

0.228 (5.79)

DIMENSIONS:

INCH (MM)

0.010 (0.25)

0.007 (0.18)

0.007 (0.18)

0.005 (0.13)

0.012 (0.03)

0.0256 (0.65) TYP

0.008 (0.20)

0.004 (0.10)

5° MAX

0° MIN

0.012 (0.03) R

0.039 (0.99)

0.035 (0.89)

0.021 (0.53)

8-Lead MSOP (MM)

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

TEL + 1 [phone] FAX + 1 [phone] 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.

© 2000 Micrel Incorporated

MIC5236 12 November 2000