Datasheet MIC2145 Datasheet (Micrel)

MIC2145 Micrel

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MIC2145

High Efficiency 2.5W Boost Converter

Final

General Description

The MIC2145 is a small size boost switching regulator that
can provide over 2.5W of output power. The input voltage
range is between 2.4V to 16V, making the device suitable for
one-cell Li-Ion and 3- to 4-cell alkaline/NiCad/NiMH applica­tions. The output voltage of the MIC2145 can be adjusted up
to 16V.

The MIC2145 is well suited for portable, space-sensitive
applications. Its typical 450kHz operation allows small sur­face mount external components to be used. The MIC2145
has a low quiescent current of 200µA, and a typical shutdown
current of 0.5µA. The MIC2145 is capable of high efficiencies
in a small board area.

The MIC2145 features a low-on resistance internal switch
that allows it to provide over 2.5W of output power. The peak
switch current can be programmed through an external
resistor. This allows the user to set the peak switch current at
the level where maximum efficiency occurs. It also allows the
user to further optimize for efficiency and inductor size by
setting the peak current below the level of inductor saturation.

The MIC2145 is available in an MSOP-8 and 3mm×3mm
MLF™-10L package with an ambient operating temperature
range from –40°C to +85°C.

Ordering Information

Features

• 2.4V to 16V input voltage

• Output adjustable to 16V

• Programmable peak current limit

• Soft start

• Up to 450kHz switching frequency

• 0.5µA shutdown current

• 200µA quiescent current

• Capable of 5V/ 500mA output with 3.3V input

• Achieves over 85% efficiency

• Implements low power BOOST, SEPIC, and FLYBACK

topologies

• MSOP-8 and 3mm×3mm MLF™-10L

Applications

• Flash LED driver

• LCD bias supply

• White LED driver

• DSL bias supply

• Local 3V to 5V conversion

T ypical Application

V

3.0V to 5.0V

IN

C

IN

10 F/6.3V

Adjustable Output Boost Converter with Programmable Peak Switch Current

I Limit

Part Number Voltage Ambient Temp. Range Package

MIC2145BMM Adj –40°C to +85°C 8-lead MSOP
MIC2145BML Adj –40°C to +85°C3×3 MLF™-10L

L1

10 H

15

EN SW

4

PGND

MIC2145BMM

3

RSET

2

SS

VDD

SGND

FB

D1

6

7

8

V

OUT

10V/150mA

C

OUT

10 F/16V

10V Output

90

85

80

75

70

EFFICIENCY (%)

65

60

10 100 1000

Efficienc

VIN = 3.0V

OUTPUT CURRENT (mA)

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

May 2003 1 MIC2145

MIC2145 Micrel

Pin Configuration

SS

RSET

PGND

1EN
2
3
4

8 SGND

FB

7

VDD

6

SW

5

8-Lead MSOP (MM)

Pin Description

Pin Number Pin Number Pin Name Pin Function

MSOP MLF

1 1 EN Enable (Input): Logic high (≥1.5V) enables regulator. Logic low (≤0.7V)

shuts down regulator. Do not float.

2 2 SS Soft Start Capacitor (External Component): Connect external capacitor to

ground to control the rise time of the output voltage.

3 3 RSET Current Limit (External Component): Sets peak current limit of the internal

power MOSFET using an external resistor.
4 4, 5 PGND Power Ground (Return): Internal power MOSFET source.
5 6, 7 SW Switch Node (Input): Internal power MOSFET drain.
6 8 VDD Supply (Input): +2.4V to +16V for internal circuitry.
7 9 FB Feedback (Input): Output voltage sense node.
8 10 SGND Small Signal Ground (Return): Ground

EN

1

SS

2

RSET

PGND
PGND SW

3
4
56

××

3mm

×3mm MLF-10L (ML)

××

10

9
8
7

SGND
FB
VDD
SW

MIC2145 2 May 2003

MIC2145 Micrel

Absolute Maximum Ratings (Note 1)

Supply Voltage (V
Switch Voltage (V
Feedback Voltage (V

Switch Current (ISW) ........................................................2A

Enable Voltage(V
RSET Voltage (V

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

Ambient Storage Temperature(T

) ....................................................18V

DD

) ....................................................18V

SW

) ................................................18V

FB

), Note 5 ........................................18V

EN

)....................................................6V

RSET

) ..........–65°C to +150°C

S

Operating Ratings (Note 2)

Supply Voltage (V
Switch Voltage (V
Ambient Temperature (T

Junction Temperature (TJ) ....................... –40°C to +125°C

Package Thermal Resistance MSOP

(MSOP-8) ....................................................206°C/W

θ

JA

θJA (3mm×3mm MLF-10) ....................................60°C/W

) ....................................... 2.4V to 16V

DD

)....................................................16V

SW

)......................... –40°C to +85°C

A

Electrical Characteristics (Note 6)

VDD = 10V, V

Parameter Condition Min Typ Max Units

Supply Voltage 2.4 16 V
Shutdown Current EN = 0.3V, VDD = 10V, VFB=1.35V 0.5 5 µA
Quiescent Current EN = VDD, VDD = 10V, VFB = 1.35V 200 300 µA
Feedback Voltage Reference (±2%) 1.058 1.08 1.102 V

Comparator Hysteresis 18 mV
Feedback Input Current VFB=1.35V 40 nA
Peak Current Limit R

Current Limit Comparator 500 ns
Propagation Delay

Switch On-Resistance ISW = 150mA, VDD = 3.0V 500 750 mΩ

Maximum Off Time 1000 ns
Enable Input Voltage Logic Low (turn-off) 1.1 0.7 V

Enable Input Current VEN = 0V –1 0.01 1 µA

Soft Start Current VEN = 2V, VDD=3.0V –8 –12 –16 µA

OUT

= 10V, I

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

OUT

(±3%) 1.048 1.112 V

=200Ω, VDD = 3.6V, Note 4 0.8 A

SET

R

=1kΩ, VDD = 10V, Note 4 0.9 A

SET

ISW = 1.2A, VDD = 10V 250 400 mΩ

Logic High (turn-on) 1.5 1.1 V

VEN = 2V –1 0.01 1 µA

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, 1.5KΩ in series with 100pF.
Note 4. The current is measured in a DC mode. Actual peak switching current will be higher due to internal propagation delay of the circuit.
Note 5. VEN ≤ VDD.
Note 6. Specification for packaged product only.

May 2003 3 MIC2145

MIC2145 Micrel

)

)

)

Typical Characteristics

Efficiency-Basic

100

90

80

70

EFFICIENCY (%)

60

50

16.0

15.8

15.6

15.4

15.2

(V)

15.0

OUT

14.8

V

14.6

14.4

14.2

14.0

Configuration

VIN = 3.3V
V

OUT

L = 10µH

0

0.01

0.02

0.03

0.04

OUTPUT CURRENT (A

0.05

Line Regulation

I

= 10mA

OUT

L = 10µH

246810121416

VDD (V)

= 10V

0.06

0.07

0.08

Efficiency-Bootstrapped

100

90

80

70

EFFICIENCY (%)

60

50

Configuration

0

0.01

0.02

0.03

OUTPUT CURRENT (A

0.04

V
V
L

IN
OUT

=

0.05

Switch On-Resistance

vs. V

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

SWITCH ON-RESISTANCE (Ω)

0.0
0 2 4 6 8 10 12 14 16 18

DD

VDD (V)

3.3V

=

=

10µH

0.06

10V

0.07

0.08

Load Regulation

9.8

9.6

9.4

9.2

0

0.01

0.02

OUTPUT CURRENT (A

0.03

0.04

VIN = 3.6V
L = 10µH

0.05

(V)

OUT

V

10.2

10.0

Switch On-Resistance

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

SWITCH ON-RESISTANCE (Ω)

0.0

vs. Temperature

-40 -20 0 20 40 60 80 100

TEMPERATURE (°C)

0.06

0.07

0.08

0.09

Quiescent Current

vs. V

0.50

0.45

0.40

0.35

0.30

0.25

0.20

0.15

0.10

0.05

QUIESCENT CURRENT (Ω)

0.00
0 2 4 6 8 10 12 14 16 18

1.5

1.4

1.3

1.2

1.1

1.0

0.9

0.8

OFF TIME (µs)

0.7

0.6

0.5

vs. Temperature

-40 -20 0 20 40 60 80 100

TEMPERATURE (°C)

DD

VDD (V)

Off Time

Feedback Voltage

1.1

1.09

1.08

1.07

1.06

FEEDBACK VOLTAGE (V)

1.05

vs. Temperature

-40 -20 0 20 40 60 80 100

TEMPERATURE (°C)

Shutdown Current

vs. Temperature

-40 -20 0 20 40 60 80 100

TEMPERATURE (°C)

SHUTDOWN CURRENT (µA)

0.50

0.45

0.40

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0.00

Feedback Current

vs. Temperature

-40 -20 0 20 40 60 80 100

TEMPERATURE (°C)

FEEDBACK CURRENT (µA)

0.10

0.09

0.08

0.07

0.06

0.05

0.04

0.03

0.02

0.01

0.00

Quiescent Current

0.50

0.45

0.40

0.35

0.30

0.25

0.20

0.15

0.10

0.05

QUIESCENT CURRENT (mA)

0.00

vs. Temperature

VIN = 3.6V

-40 -20 0 20 40 60 80 100

TEMPERATURE (°C)

MIC2145 4 May 2003

MIC2145 Micrel

400

600

800

1000

1200

1400

1600

1800

2000

100 1000 10000 100000

PEAK CURRENT LIMIT (mA)

RSET(Ω)

Peak Current Limit

vs. RSET

15V

5.0V

4.2V

2.4V

3.0V

3.3V

3.6V

8.0V

10V

12V

VOUT/VIN > 1.25

L = 10µH

VIN =

Soft Start Current

vs. Temperature

14
12
10

8
6
4
2

SOFT START CURRENT (µA)

0

-40 -20 0 20 40 60 80 100

TEMPERATURE (°C)

VIN = 3.6V

Peak Current Limit

1.4

1.3

1.2

1.1

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

PEAK CURRENT LIMIT (A)

0.1

vs. Temperature

R

= 200

SET

R

= 500

SET

VIN = 3.6V
V

= 10V

OUT

L = 10µH

0

-40 -20 0 20 40 60 80 100

R

SET

R

= 10k

SET

TEMPERATURE (°C)

= 1k

May 2003 5 MIC2145

MIC2145 Micrel

Functional Diagram

R

SET

V

RSET

IN

10µH

L1

C

IN

6

VDD

3

Current Limit

Comparator

Thermal

Shutdown

One Shot

800nS

Soft

Start

POWER

MOSFET

SW

D1

5

R1

V

OUT

C

C

OUT

FF

R2

SGND

8

PGND

Feedback

Comparator

4

FB

/S

/R/Q

7

V

REF

EN

1

On(/Off)

SS

V 1.08

=

OUT

2

C

SS

R1





1

+







R2

Figure 1. Block Diagram

MIC2145 6 May 2003

MIC2145 Micrel

Functional Description

See

“Application Information”

pre-designed circuits.

Overview

The MIC2145 is a 2.5W boost regulator with programmable
peak current limit and a constant off time. Quiescent current
for the MIC2145 is typically 200µA when the switch is in the
off state. Efficiencies above 80% throughout most operating
conditions can be realized.

Regulation

Regulation is achieved by both of the comparators, which
regulate the inductor current and the output voltage by gating
the power MOSFET. Initially, power is applied to the SW and
VDD pins. When the part is enabled, the power MOSFET
turns on and current flows. When the current exceeds the
peak current limit threshold, the current limit comparator fires
the one-shot to turn off the power MOSFET for 1000ns and
resets the SR flip-fop. The current limit comparator continues
to cycle the power MOSFET on and off until the output voltage
trips the upper threshold of the feedback comparator, which
terminates the cycle. The cycle will begin again when the
output voltage drops below the lower hysteresis threshold of
the feedback comparator. The feedback comparator has a
typical hysteresis of 18mV. Due to the gain of the feedback
resistor divider, the voltage at V
167mV of hysteresis for 10V output at 2.4V VDD. This can be
reduced by adding a feed-forward capacitor, CFF (See

“Output Voltage”

section).

for component selection and

experiences a typical

OUT

Output

The maximum output voltage is limited by the voltage capa­bility of the output switch. Output voltages of up to 16V can be
achieved with the boost circuit. Higher output voltages re­quire a flyback configuration.

Peak Current Limit

The peak current limit is externally set with a resistor. The
peak current range is from 420mA to 2A. There is a minimum
resistor value for R
value selections, see the

Current Limit vs. R

at lower VDD voltages. For resistor

SET

“Typical Characteristics: Peak

”

.

SET

Soft Start

The MIC2145 has a built in soft start that controls the rise time
of the output voltage and the peak current limit threshold
during start up.

V

EN

(2V/div)

V

(5V/div)

V

(5V/div)

I

INDUCTOR

(500mA/div)

OUT

SW

Time 200µs

V

C

SS

V

IN

= 10V

OUT

= 10k

R

SET

= 0.01µF

= 3V

Figure 3. Typical Soft Start Waveforms

V

OUT

AC Couple

(100mV/div)

V

SW

(5V/div)

I

INDUCTOR

(500mA/div)

Time 20µs

Figure 2. Typical Regulator Waveforms

Thermal Shutdown

Built-in thermal protection circuitry turns off the power MOSFET
when the junction temperature exceeds about 150°C.

May 2003 7 MIC2145

MIC2145 Micrel

Time 4µs

V

OUT

AC Couple

(100mV/div)

V

SW

(5V/div)

Application Information

Pre-designed circuit information is at the end of this section.

Output Voltage

The output voltage of the regulator can be set between 2.4V
and 16V by connecting a resistor divider at the FB pin. The
resistor values are selected by the following equations:

VR

108 1

R

. •

2

=

VV

AC Couple

(100mV/div)

(5V/div)

OUT

V

OUT

V

SW

108

−

.

Time 20µs

A value of 1MΩ is recommended for R1 to minimize the
quiescent current when the part is off. Then, R2 can be solved
using the above equation. A feed-forward capacitor, C

FF

ranging from 5pF to 100pF can be used in parallel with R1 to
reduce the peak-to-peak output voltage ripple, which is
shown in Figures 4 and 5.

,

Figure 4. Without Feed-Forward Capacitor

Figure 5. With Feed-Forward Capacitor (100pF)

MIC2145 8 May 2003

MIC2145 Micrel

Bootstrap

A bootstrapped configuration is recommended for applica­tions that require high efficiency at heavy loads (>70mA).
This is achieved by connecting the VDD pin to V

V

IN

3.6V
C1

10µF/6.3V

GRM42-6 X5R 106K 6.3

Murata

100k

R1

R2

10k

(see

OUT

L1

10µH

Sumida

CR43-100

VDD SW

EN

MIC2145

RSET

SS

C2

0.01µF

Figure 6. Basic Configuration

Figure 7). For applications that require high efficiency at light
loads (<70mA), the V

pin is connected to the input voltage

DD

(VIN); this is referred to as the basic configuration (see Figure

6).

D1
On Semiconductor

PGND

FB

SGND

MBR0530T1

R4

1M

100pF

R3

274k

C3

V

OUT

5V/250mA

C4
10µF/6.3V
Murata
GRM42-6 X5R 106K 6.3

V

IN

3.6V
C1

10µF/6.3V

GRM42-6 X5R 106K 6.3

Murata

L1

10µH

Sumida

R2

10k

CR43-100

PGND SW

SGND

MIC2145

RSET

SS

C2

0.01µF

VDD

EN

FB

R1

100k

D1
On Semiconductor
MBR0530T1

Figure 7. Bootstrap Configuration

R4

1M

R3

274k

C3

100pF

V

OUT

5V/350mA

C4
10µF/6.3V
Murata
GRM42-6 X5R 106K 6.3

May 2003 9 MIC2145

MIC2145 Micrel

Inductor

The MIC2145 has a programmable peak current to allow the
usage of small surface mount inductors. A 10µH or 4.7µH
inductor is recommended for most portable applications such
as powering white LEDs and biasing LCD panels. The

V

V

)nim(NI

)V()V()()Am()V(

5.4

5.95201

4.2

5.110221

5.415151

5.4

5.90501

0.3

5.110421

5.410351

5.4

5.90701

6.3

5.110521

5.410451

5.9

0.5

5.1103121

5.410951

)xam(NI

TESRI

Ω

k01

k01

k01

k01

V

)xam(TUO

TUO

085

0515

0525

09101

inductor should have a saturation current rating higher than
the peak current during circuit operation. A low ESR (Equiva­lent Series Resistance) inductor is also desirable for high
efficiency. Below are tables that list the maximum output
current at minimum input voltage with efficiencies greater
than 80%.

V

V

)nim(NI

)V()V()()Am()V(

5.4

5.900101

4.2

5.110921

5.410751

5.4

5.905101

0.3

5.1102121

5.4100151

5.4

5.907101

6.3

5.1105121

5.4102151

5.9

0.5

5.1105221

5.4100251

)xam(NI

TESRI

Ω

k01

k01

k01

k01

V

)xam(TUO

TUO

0615

0525

0535

00301

Table 1. Typical Application for 10µH Inductor in

Basic Configuration

V

V

)nim(NI

)V()V()()Am()V(

5.4

)xam(NI

TESRI

Ω

V

)xam(TUO

TUO

0525

5.90801

0.3

004

5.90621

5.90551

Table 3. Typical Application for 4.7µH Inductor in

Basic Configuration

Table 2. Typical Application for 10µH Inductor in

Bootstrap Configuration

V

V

)nim(NI

)V()V()()Am()V(

5.4

)xam(NI

TESRI

Ω

V

)xam(TUO

TUO

0055

5.452201

0.3

002

5.405121

5.403151

Table 4. Typical Application for 4.7µH Inductor in

Bootstrap Configuration

MIC2145 10 May 2003

MIC2145 Micrel

Diode

A Schottky diode should be used for the output diode. Most
of the application circuits on this data sheet specify the
Motorola MBR0530 surface mount Schottky diode. It has a
forward current of 0.5A and a low forward voltage drop. For
applications that are cost driven, the 1N4148 or equivalent
can be used but the efficiency will suffer due to higher forward
voltage drop.

Output Capacitor

Low ESR capacitors should be used at the output of the
MIC2145 to minimize the switching output ripple voltage.
Selection of the capacitor value will depend upon the peak
inductor current, inductor size, and the load. MuRata offers
the GRM43-2 series with up to 10µF at 25V, with a X5R
temperature coefficient in a 1812 surface-mount package.
For lower output voltage applications, the GRM42-2 (1210
package/10µF/16V) and GRM42-6 (1206 package/10µF/

6.3V) series can be used. Typically, values ranging from
10µF to 47µF can be used for the output capacitor.

Reducing Peak Current

If lower than 400mA peak current is required then the soft
start pin may be shorted to ground. This changes the refer­ence of the current limit comparator. With the soft start pin
shorted to ground, the maximum current will approximately
reduce to half. The peak current should always be set at least
50% higher than the maximum load current.

May 2003 11 MIC2145

MIC2145 Micrel

y

Pre-designed Application Circuits

L1

4.7µH

Murata

V

IN

3.0V-4.2V
C1

10µF/6.3V

GRM42-6 X5R 106K 6.3

Murata

JP1

R1

100k

R2

10k

LQH3C4R7M24

VDD SW

EN

RSET

SS

C2

0.01µF

PGND

MIC2145

SGND

FB

D1
On Semiconductor
MBR0530T1

R4

C3

1M

100pF

R3

274k

V

OUT

5V

C4
10µF/6.3V
Murata
GRM42-6 X5R 106K 6.3

LED1

LED2 LEDn

RR R

VNIV

daoLegatloVelppiRycneiciffE

TUO

VV Am)kaep-kaep(Vm%

6.30.504001<58

5V Output

90

85

80

75

70

EFFICIENCY (%)

65

60

1 10 100 1000

Efficienc

VIN = 3.6V

OUTPUT CURRENT (mA)

Figure 8. White LED Driver Application (Drives 1 to 10 LEDs in Parallel)

MIC2145 12 May 2003

MIC2145 Micrel

60

65

70

75

80

85

90

10 100 1000

EFFICIENCY (%)

OUTPUT CURRENT (mA)

y

L1

10µH

Sumida

V

IN

3.0V-5.0V
C1

10µF/6.3V

GRM42-6 X5R 106K 6.3

Murata

JP1

R1

100k

R2

10k

CR32-100

PGND SW

EN

VDD

MIC2145

RSET

SS

C2

0.01µF

SGND

FB

D1
On Semiconductor
MBR0530T1

R4

C3

1M

100pF

R3

121k

V

OUT

10.0V

C4
10µF/16V
Murata
GRM42-2 X5R 106K 16

VNIV

daoLegatloVelppiRycneiciffE

TUO

VV Am)kaep-kaep(Vm%

0.30.01051002<38

10V Output

Efficienc

VIN = 3.0V

Figure 9. LCD Application — Bootstrap Configuration

May 2003 13 MIC2145

MIC2145 Micrel

y

L1

10 H

Sumida

V

IN

3.0V-5.0V
C1

10 F/6.3V

GRM42-6 X5R 106K 6.3

Murata

JP1

R1

100k

R2

10k

CR32-100

PGND SW

EN

VDD

MIC2145

RSET

SS

C2

0.01 F

SGND

FB

D1
On Semiconductor
MBR0530T1

R4

1M

100pF

R3

78.7k

C3

V

OUT

15.0V

C4
10 F/16V
Murata
GRM42-2 X5R 106K 16

LED1RLED2 LED3 LED4

VNIV

daoLegatloVelppiRycneiciffE

TUO

VV Am)kaep-kaep(Vm%

6.30.5104001<58

15V Output

90

85

80

75

70

EFFICIENCY (%)

65

60

1 10 100

Efficienc

VIN = 3.6V

OUTPUT CURRENT (mA)

Figure 10. Series White LED Driver Application

MIC2145 14 May 2003

MIC2145 Micrel

5

Package Information

0.122 (3.10)

0.112 (2.84)

0.036 (0.90)

0.032 (0.81)

0.012 (0.3)

0.0256 (0.65) TYP

0.48 typ.

1
2
3

0.20 dia

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:

0.012 (0.30) R

0.008 (0.20)

0.004 (0.10)

5° MAX

0° MIN

8-Pin MSOP (MM)

+0.15

0.85

3.00 BSC.

1.50 BSC.

1.50 BSC.

3.00 BSC.

TOP BOTTOM

TERMINAL TIP

—0.05

+0.04

0.01

—0.01

0.50 BSC.

SEATING PLANE

0.23

+0.07
—0.05

INCH (MM)

0.039 (0.99)

0.035 (0.89)

0.021 (0.53)

0.007 (0.18)

0.005 (0.13)

0.012 (0.03) R

+0.15

1.60

—0.15
+0.15

0.80

—0.15

PIN 1 ID

1

+0.15

1.15

—0.15

2
3

+0.15

0.40

—0.05

+0.07

0.23

—0.05

2.30

0.01

+0.15

—0.1

+0.04
—0.01

0.50 BSC.

TERMINAL TIP

ODD TERMINAL SIDE EVEN TERMINAL SIDE

0.50 BSC.

10-Pin MLF (ML)

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

TEL + 1 [phone] FAX + 1 [phone] WEB http://www.micrel.com

The information furnished by Micrel in this datasheet 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 at Purchaser’s own risk and Purchaser agrees to fully indemnify

Micrel for any damages resulting from such use or sale.

© 2003 Micrel, Incorporated.

May 2003 15 MIC2145