Datasheet MIC2549A-2BN, MIC2549A-2BTS, MIC2545A-2BTS, MIC2549A-1BM, MIC2549A-1BN Datasheet (MICREL)

MIC2545A/2549A Micrel

MIC2545A/2549A

Programmable Current Limit High-Side Switch

Preliminary Information

General Description

The MIC2545A and MIC2549A are integrated high-side
power switches optimized for low loss dc power switching and
other power management applications, including Advanced
Configuration and Power Interface (ACPI). The MIC2545A/
49A is a cost-effective, highly integrated solution that re­quires few external components to satisfy USB and ACPI
requirements.

Load current management features include a precision resis­tor-programmable output current-limit and a soft-start circuit,
which minimizes inrush current when the switch is enabled.
Thermal shutdown, along with adjustable current-limit, pro­tects the switch and the attached device.

The MIC2545A/49A’s open-drain flag output is used to indi­cate current-limiting or thermal shutdown to a local controller.
The MIC2549A has an additional internal latch which turns
the output off upon thermal shutdown, providing robust fault
control. The enable signal is compatible with both 3V and 5V
logic, and is also used as the thermal shutdown latch reset for
the MIC2549A.

The MIC2545A and MIC2549A are available in active-high
and active-low enable versions in 8-pin DIP, SOIC, and
TSSOP packages.

Features

• 2.7V to 5.5V input

• Adjustable current-limit up to 3A

• Reverse current flow blocking

• 90µA typical on-state supply current

• 1µA typical off-state supply current

• 50mΩ maximum on-resistance

• Open-drain fault flag

• Thermal shutdown

• Thermal shutdown output latch (MIC2549A)

• 2ms (slow) soft-start turn-on, fast turnoff

• Available with active-high or active-low enable

Applications

• USB power distribution

• PCI Bus Power Switching

• Notebook PC

• ACPI power distribution

• PC card hot swap applications

• Inrush current-limiting

Typical Application

+5V

R

SET

MIC2545A

EN
FLG
GND
ILIM

OUT

IN

OUT

IN

0.1µF

Peripheral

33µF

10k

On/Off

Typical Advanced Configuration and Power Interface (ACPI) Application

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

June 2000 1 MIC2545A/2549A

MIC2545A/2549A Micrel

Ordering Information

Part Number Enable Latch* Temperature Range Package

MIC2545A-1BM Active High –40°C to +85°C 8-lead SOP
MIC2545A-1BN Active High –40°C to +85°C 8-pin DIP
MIC2545A-1BTS Active High –40°C to +85°C 14-lead TSSOP
MIC2545A-2BM Active Low –40°C to +85°C 8-lead SOP
MIC2545A-2BN Active Low –40°C to +85°C 8-pin DIP
MIC2545A-2BTS Active Low –40°C to +85°C 14-lead TSSOP
MIC2549A-1BM Active High •–40°C to +85°C 8-lead SOP
MIC2549A-1BN Active High •–40°C to +85°C 8-pin DIP
MIC2549A-1BTS Active High •–40°C to +85°C 14-lead TSSOP
MIC2549A-2BM Active Low •–40°C to +85°C 8-lead SOP
MIC2549A-2BN Active Low •–40°C to +85°C 8-pin DIP
MIC2549A-2BTS Active Low •–40°C to +85°C 14-lead TSSOP

Pin Configuration

EN

FLG

GND

ILIM

(EN) 1

(FLG) 2

MIC2545A/2549A

1
2
3
4

8-Lead SOP (M)

8-Pin DIP (N)

MIC2545A/2549A

LOGIC,

CHARGE

PUMP

3 (GND)(ILIM) 4

OUT

8

IN

7

OUT

6

IN

5

6,8 (OUT)

5,7 (IN)

NC

FLG

GND

ILIM

MIC2545A/2549A

1EN OUT
2
3
4NC
5
6NC
7

14
13
12
11
10

9
8

14-Lead TSSOP (TS)

Pin Description

Pin Number Pin Number Pin Name Pin Function

SOP, DIP TSSOP

1 1 EN Enable (Input): Logic-compatible enable input (-1 version is active high, -2

version is active low). High input >1.8V typical; low input <1.4V typical.
Do not float.
MIC2549A only: Also resets thermal shutdown latch.

2 3 FLG Fault Flag (Output): Active-low, open-drain output. Indicates overcurrent or

thermal shutdown.

MIC2549A only: latched low on thermal shutdown.
3 5 GND Ground: Supply return.
4 7 ILIM Current Limit: Sets current limit threshold using an external resistor (R

connected to ground. 76.8Ω < R

5, 7 8, 12 IN Supply Input: Output MOSFET drain. Also powers internal circuitry. Both IN

pins must be externally connected together.

6, 8 10, 14 OUT Switch Output: Output MOSFET source. Both OUT pins must be externally

connected together.

2,4,6,9,11,13 NC not internally connected

SET

< 459Ω.

NC
IN

NC
OUT
NC
IN

SET

)

MIC2545A/2549A 2 June 2000

MIC2545A/2549A Micrel

Absolute Maximum Ratings (Note 1)

Supply Voltage (V
Output Voltage (V
Output Current (I

Enable Input (VEN) ......................................... –0.3V to +6V

Fault Flag Voltage (V
Fault Flag Current (I

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

Junction Temperature (T

) ..................................................+6.0V

IN

) ...............................................+6.0V

OUT

)...............................Internally Limited

OUT

)...........................................+6.0V

FLG

) ............................................50mA

FLG

) .......................Internally Limited

J

Operating Ratings (Note 2)

Supply Voltage (V
Ambient Temperature Range (T
Package Thermal Resistance

PDIP (θ

) .........................................................130°C/W

JA

SOIC (θJA).........................................................160°C/W

TSSOP (θJA), Note 6 ........................................100°C/W

Current Limit Set Range, Note 5........................ 0.5A to 3A

) ................................... +2.7V to +5.5V

IN

) .............–40°C to +85°C

A

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

ESD Rating, Note 3 ..................................................2000V

Electrical Characteristics

VIN = +5V; TA = 25°C, bold indicates –40°C to +85°C; unless noted
Symbol Parameter Condition Min Typ Max Units

Supply Current Switch off, OUT = open, Note 4 0.75 5 µA

Switch on, OUT = open, Note 4 90 125 µA

150 µA

V

EN

R

DS(on)

t

ON

t

R

t

OFF

t

F

t

SU

V

OL

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. Off is ≤ 0.8V and on is ≥ 2.4V for the MIC2545A-1 and MIC2549A-1. Off is ≥ 2.4V and on is ≤ 0.8V for the MIC2545A-2 and MIC2549A-2.

Note 5. Current limit is determined by:
Note 6. Assumes 4 layer PCB is used.

Note 7. Guaranteed by design but not production tested.

Enable Input Voltage Enable high transition, Note 4 2.4 1.6 V

Enable low transition, Note 1 1.5 0.8 V

Enable Input Current VEN = V

VEN = V

= 2.4V 0.01 1 µA

OH(min)

= 0.8V 0.01 1 µA

OL(max)

Enable Input Capacitance Note 7 1pF
Switch Resistance I
Current Limit Factor I

Output Leakage Current Switch off, V

= 500mA 35 50 mΩ

OUT

= 0.5A to 3A, V

LIMIT

I

= 1A to 2.5A, V

LIMIT

= 0V 1 10 µA

OUT

= 1V to 4V, Note 5 160 230 300 V

OUT

= 1V to 4V, Note 5 184 230 276 V

OUT

Output Turn-On Delay RL = 10Ω, CL = 1µF, Figures 1a, 1b 125ms
Output Turn-On Rise Time RL = 10Ω, CL = 1µF, Figure 1a, 1b 0.75 1.8 4.9 ms
Output Turnoff Delay RL = 10Ω, CL = 1µF, Figure 1a, 1b 25 µs
Output Turnoff Fall Time RL = 10Ω, CL = 1µF, Figure 1a, 1b 23 µs
Overtemperature Threshold TJ increasing 135 °C

Shutdown
Error Flag Off Current V

TJ decreasing 120 °C

= 5V 0.01 1 µA

FLG

EN Pulse Reset Width MIC2549A thermal shutdown latch, Note 7 1 µs
VIN to EN Set-Up MIC2549A, Note 7, Figure 1c 0 µs
Current-Limit Response Time V
Error Flag Output Resistance I

The enable input has about 100mV of hysteresis.

LIMIT

230

=

, where R

R

SET

I

= 0V to I

OUT

= 10mA 4 15 Ω

FLG

is in ohms, and 230 is typical current limit factor in volts.

SET

OUT

= 2A, I

= 1A, Note 7 40 µs

SET

June 2000 3 MIC2545A/2549A

MIC2545A/2549A Micrel

Test Circuit

V

OUT

Device
Under
Test

OUT

I

OUT

C

R

L

L

Timing Diagrams

t

r

V

OUT

90%

10%

90%

10%

t

f

Functional Characteristics Test Circuit

V

EN

V

OUT

50%

t

OFF

t

ON

90%

10%

Figure 1a. MIC2545A/49A-2

V

EN

V

OUT

50%

t

OFF

t

ON

90%

10%

Figure 1b. MIC2545A/49A-1

V

IN

t

SU

V

EN

Figure 1c. Input-to-Enable Setup Timing

MIC2545A/2549A 4 June 2000

MIC2545A/2549A Micrel

O

utput Reset

V
I

LIMIT

V

I

LIMIT

I

FLG

Short-Circuit Fault

Fault Removed

OUT

I

OUT

EN

I

DC

Thermal Shutdown

Reached

FLG

Figure 2a. MIC2549A-2 Timing: Output Is Reset By Toggling EN

Short-Circuit

EN

OUT

I

DC

OUT

Thermal Shutdown

Reached

Fault

Fault

Removed

Figure 2b. MIC2545A-2 Timing

June 2000 5 MIC2545A/2549A

MIC2545A/2549A Micrel

Typical Characteristics

Output On-Resistance

vs. Supply Voltage

40
39
38
37
36
35
34
33
32
31

OUTPUT RESISTANCE (mΩ)

30

2.5 3.0 3.5 4.0 4.5 5.0 5.5

SUPPLY VOLTAGE (V)

TA = 27°C

On-State Supply Current

140
120
100

SUPPLY CURRENT (µA)

vs. Temperature

80
60
40
20

0

-40 -20 0 20 40 60 80 100

5.0V

3.3V

2.7V

TEMPERATURE (°C)

Output On-Resistance

vs. Temperature

50

45

40

35

30

OUTPUT RESISTANCE (mΩ)

25

2.7V

-40 -20 0 20 40 60 80 100

TEMPERATURE (°C)

3.3V

Off-State Supply Current

0.5

0.4

0.3

0.2

0.1

SUPPLY CURRENT (µA)

vs. Temperature

RL = 44Ω

5.0V

3.3V

0

-40 -20 0 20 40 60 80 100

TEMPERATURE (°C)

5.0V

2.7V

On-State Supply Current

vs. Supply Voltage

140
120
100

80
60
40

SUPPLY CURRENT (µA)

20

0

2.5 3.0 3.5 4.0 4.5 5.0 5.5

SUPPLY VOLTAGE (V)

TA = 27°C

Off-State Supply Current

vs. Supply Voltage

0.10

0.09

0.08

0.07

0.06

0.05

0.04

0.03

0.02

SUPPLY CURRENT (µA)

0.01
0

2.5 3.0 3.5 4.0 4.5 5.0 5.5

SUPPLY VOLTAGE (V)

TA = 27°C

Control Threshold Voltage

vs. Supply Voltage

2.0

1.9

1.8

1.7

1.6

1.5

1.4

1.3

1.2

1.1

THRESHOLD VOLATAGE (V)

1.0

2.5 3.0 3.5 4.0 4.5 5.0 5.5

HIGH

SUPPLY VOLTAGE (V)

TA = 27°C

LOW

Output Fall Time

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

OUTPUT FALL TIME (µs)

0.2

vs. Temperature

RL = 44Ω

CL = 0µF

0

-40 -20 0 20 40 60 80 100

TEMPERATURE (°C)

2.7V

3.3V

5.0V

Control Threshold Voltage

1.9

1.8

1.7

1.6

1.5

1.4

1.3

1.2

CONTROL THRESHOLD (V)

1.1

vs. Temperature

HIGH

LOW

-40 -20 0 20 40 60 80 100

TEMPERATURE (°C)

Current Limit

I

LIMIT

vs. Rset

I

SHORT

R

(Ω)

SET

I

3500
3000
2500
2000
1500
1000

CURRENT LIMIT (mA)

500

0

0 150 300 450 600

VIN = 5V

TH

Rise Time

4.0

3.5

3.0

2.5

2.0

1.5

1.0

OUTPUT RISE TIME (ms)

0.5

vs. Temperature

2.7V

5.0V

0

-40 -20 0 20 40 60 80 100

TEMPERATURE (°C)

Output Current

3500
3000
2500
2000
1500
1000

OUTPUT CURRENT (mA)

vs. Output Voltage

R

SET

R

= 230

SET

500

0

0 1.0 2.0 3.0 4.0 5.0 6.0

OUTPUT VOLTAGE (V)

R

SET

3.3V

RL = 44Ω

= 92

VIN = 5V

= 460

MIC2545A/2549A 6 June 2000

MIC2545A/2549A Micrel

Current Limit

1500
1400
1300
1200
1100
1000

900
800
700

OUTPUT CURRENT (mA)

600
500

vs. Temperature

VIN = 5V
R

SET

I

TH

I

SET

I

SHORT

-40 -20 0 20 40 60 80 100

TEMPERATURE (°C)

= 230Ω

Current Limit

1200

1100

1000

CURRENT LIMIT (mA)

vs. Supply Voltage

TA = 27°C
R

= 230Ω

L

900

800

700

600

I

SHORT

2.5 3.0 3.5 4.0 4.5 5.0 5.5

SUPPLY VOLTAGE (V)

I

TH

I

SET

June 2000 7 MIC2545A/2549A

MIC2545A/2549A Micrel

Functional Characteristics

EN

V

FLG

V

OUT

V

OUT

I

EN

V

FLG

V

OUT

V

OUT

I

(10V/div.)

(10V/div.)

(2V/div.)

(200mA/div.)

MIC2545A-1

(10V/div.)

(10V/div.)

(5V/div.)

(500mA/div.)

MIC2545A-1

Turn-On Response

500mA

VIN = 5V

= 100µF

C

L

= 10Ω

R

L

TIME (500µs/div.)

Current-Limit Response

Load Removed

Thermal Shutdown

Current-Limit Threshold 1.12A (ITH)

I

= 1A

SET

C = 5V

= 1Ω

R

L

EN

V

FLG

V

OUT

V

OUT

I

(10V/div.)

(10V/div.)

(2V/div.)

(200mA/div.)

EN

V

FLG

V

OUT

V

OUT

I

MIC2545A-1

(10V/div.)

(10V/div.)

(5V/div.)

(500mA/div.)

MIC2545A-1

Turnoff Response

500mA

TIME (1ms/div.)

Short-Circuit Response

Short Circuit

Current-Limit Threshold 1.12A

Short-Circuit Current

Thermal

Shutdown

V

= 5V

IN

= 100µF

C

L

= 10Ω

R

L

820mA (I

SHORT

)

VIN = 5V

EN

V

FLG

V

OUT

V

OUT

I

(10V/div.)

(10V/div.)

(5V/div.)

(500mA/div.)

MIC2545A-1

TIME (100ms/div.)

Enable Into Short Circuit

Short-Circuit Current

Thermal
Shutdown

TIME (100ms/div.)

820mA

= 5V

V

IN

R

SET

= 240Ω

EN

V

(10V/div.)

FLG

V

(10V/div.)

OUT

I

(500mA/div.)

MIC2545A-1

TIME (100ms/div.)

Inrush Current Response

= 5V

V

IN

= 10Ω

R

L

CL = 490µF

CL = 130µF

CL = 10µF

TIME (500µs/div.)

MIC2545A/2549A 8 June 2000

MIC2545A/2549A Micrel

(Output Reset by Toggling Enable—MIC2549-1)

Thermal Shutdown

EN

V

(10V/div.)

FLG

V

V

I

(5V/div.)

OUT

(5V/div.)

OUT

(500mA/div.)

Ramped Load to a Short

Output Latched

Thermal
Shutdown

TIME (100ms/div.)

Output Reset

V

= 5V

IN

= 47µF

C

L

June 2000 9 MIC2545A/2549A

MIC2545A/2549A Micrel

Block Diagram

EN

IN
IN

OSC.

THERMAL

SHUTDOWN

1.2V

REFERENCE

CHARGE

PUMP

RESET

THERMAL

SHUTDOWN

LATCH

(MIC2549A)

GND

GATE

CONTROL

CURRENT

LIMIT

ILIM

OUT
OUT

FLG

R

SET

MIC2545A/2549A 10 June 2000

MIC2545A/2549A Micrel

Functional Description

The MIC2545A and MIC2549A are high-side N-channel
switches available with active-high or active-low enable in­puts. Fault conditions turn off or inhibit turn-on of the output
transistor and activate the open-drain error flag transistor
making it sink current to ground.

Input and Output

IN is the power supply connection to the logic circuitry and the
drain of the output MOSFET. OUT is the source of the output
MOSFET. In a typical circuit, current flows from IN to OUT
toward the load. If V
from OUT to IN since the switch is bidirectional when en­abled. The output MOSFET and driver circuitry are also
designed to allow the MOSFET source to be externally forced
to a higher voltage than the drain (V
switch is disabled. In this situation, the MIC2545A/49A avoids
undesirable current flow from OUT to IN. Both IN pins must
be connected together, and both OUT pins must be con­nected together.

Thermal Shutdown

Thermal shutdown shuts off the output MOSFET and signals
the fault flag if the die temperature exceeds 135°C. 10°C of
hysteresis prevents the switch from turning on until the die
temperature drops to 125°C. Overtemperature detection
functions only when the switch is enabled.

The MIC2549A features an internal latch which causes the
part to remain off after thermal shutdown until a reset pulse
is provided via the enable pin (pin 1). While in current-limit, the
thermal shutdown latch prevents on/off cycling of the output.
Refer to Figure 2 for timing diagram. The flag remains low
until reset.

Enable Input

EN must be driven logic high or logic low, or be pulled high or
low for a clearly defined input. Floating the input may cause
unpredictable operation. EN should not be allowed to go
negative with respect to GND.

Current-Limit Operation

The current limit is user adjustable with an external set
resistor. Current limiting in the range of 500mA to 3A is
available with a set point accuracy of better than ±30% (±20%
for I

1 to 2.5A). The current-limit circuit prevents damage

SET

to the output MOSFET and external load.

is greater than VIN, current will flow

OUT

> VIN) when the

OUT

The current-limit response of the MIC2545A/49A is based on
the type of load that is applied to the output and is defined in
three parts:

1. The first mode of operation is where the device
enters a constant-current mode preventing
further increases in output current. The value of
this current, I
R

as explained further in this section.

SET

, is defined by the value of

LIMIT

2. When a short circuit is applied to the output of
an enabled device the output current immedi­ately folds back to a value less than I
I

. This further protects the load and

SHORT

LIMIT

called

reduces device power dissipation. Refer to the
“Typical Characteristics: Output Current vs.
Output Voltage” graph for details.

3. When a load is increased, the output current will
proportionally increase up to the current-limit
threshold, ITH, as shown in the “Functional
Characteristics: Current-Limit Response” graph.
The device in this case will supply current
slightly higher than the current-limit set point
defined by R
further the current folds back to I

The nominal current-limit value, I

. As the load is increased

SET

LIMIT

, is set with an external

LIMIT

.

resistor between ILIM (pin 4) and GND (pin 3). For a desired
current-limit, the value of the external set resistor is given by:





R =

SET



I



230

LIMIT





where:

76.8Ω < R

For example, to set a 1A nominal current-limit, R

SET

< 459Ω

SET

is

calculated as:

230





1A

=Ω230





SET





Refer to the “Typical Characteristics: Current-Limit vs R
graph for more details.

Current through R
voltage across R

increases with output current. The

SET

could be monitored with a high imped-

SET

ance comparator to provide an indication of output current.
R

should be between 76.8Ω and 459Ω (1% resister

SET

value).

Fault Flag

FLG is an N-channel, open-drain MOSFET output. The fault­flag is active (low) for current-limit or thermal shutdown
conditions. The flag output MOSFET is capable of sinking a
10mA load to typically 100mV above ground. For applications
with VIN ≤ 3.6V, it is recommended that flag current be limited
to 5mA or less.

”

June 2000 11 MIC2545A/2549A

MIC2545A/2549A Micrel

= junction temperature

Applications Information

Supply Filtering

A 0.1µF to 1µF bypass capacitor from IN to GND, located near
the MIC2545A and MIC2549A, is strongly recommended to
control supply transients. Without a bypass capacitor, an
output short may cause sufficient ringing on the input (from
supply lead inductance) to damage internal control circuitry.

Input transients must not exceed the absolute maximum
supply voltage (V

= 6V) even for a short duration.

IN max

4.0V to 5.5V

MIC2549A-1BM

18

EN OUT

27

FLG

36

GND OUT

45

ILIM IN

R

SET

IN

0.1µF to 1µF

T

J

TA = ambient temperature

θ

= is the thermal resistance of the package

JA

Transient Overcurrent Filter

The inrush current from the connection of a heavy capacitive
load may cause the fault flag to fall for 10µs to 200µs while the
switch is in a constant-current mode, charging the capaci­tance.

Adding an optional series resistor-capacitor (R
lel with R

, as shown in Figure 4, allows the transient

SET

SET2

) in paral-

current-limit to be set to a different value than steady state. A
typical USB hot-plug inrush is 2A to 3A for 10µs to 20µs. If
R

is 435Ω (530mA), an R

SET

of 88Ω (2.5A) and C

SET2

SET

of
1µF (RC ≈ 90µs) allows transient surge of 3A to pass for 90µs
without tripping the overcurrent flag (FLG).

USB Power Distribution

The MIC2545A is ideal for meeting USB power distribution
requirements. Figure 7 depicts a USB Host application. R

SET

should be set to a value providing a current-limit >500mA.

Figure 3. Supply Bypassing

Power Dissipation

The device's junction temperature depends on several fac­tors such as the load, PCB layout, ambient temperature and
package type. Equations that can be used to calculate power
dissipation and junction temperature are found below.

Calculation of power dissipation can be accomplished by the
following equation:

PD = R

DS(on)

× (I

OUT

)2

To relate this to junction temperature, the following equation
can be used:

TJ = PD × θJA + T

A

The accurate current-limit of the MIC2545A will reduce power
supply current requirements. Also, fast reaction to short
circuit faults prevent voltage droop in mobile PC applications.

Printed Circuit Board Hot-Plug

The MIC2545A/49A is an ideal inrush current-limiter suitable
for hot-plug applications. Due to the integrated charge pump,
the MIC2545A/49A presents a high impedance when off and
slowly becomes a low impedance as it turns on. This “soft-
start” feature effectively isolates power supplies from highly
capacitive loads by reducing inrush current during hot-plug
events. Figure 5 shows how the MIC2545A may be used in
a hot-plug application.

where:

5V

(+)

4.7µF

(–)

V

BUS

D+

D–

GND

Bold lines indicate

0.1" wide, 1-oz. copper
high-current traces.

MIC5203-3.3

LDO Regulator

IN OUT

GND

1.5k
2%

3.3V USB Controller

V+

1.0
µF

OVERCURRENT

D+
D–

10k

GND

ON/OFF

0.1µF

MIC2545A-2

EN OUT
FLG IN
GND OUT
ILIM IN

R

SETRSET(2)

(optional)

120µF

0.1µF

C

SET

Ferrite

Bead

0.01µF

V

BUS

D+

D–

GND

Downstream

USB

Port 1

4.75V min.

500mA max.

Figure 4. USB Host Application

MIC2545A/2549A 12 June 2000

MIC2545A/2549A Micrel

MIC2545A-2

18

V

to "Hot"
Receptacle

GND

CC

EN OUT

27

FLG

0.1
µF

36

GND OUT

4

I

LIM

IN

5

IN

0.1µF

C

BULK

Backend
Function

Adaptor Card

Figure 5. Hot-Plug Application

June 2000 13 MIC2545A/2549A

MIC2545A/2549A Micrel

Package Information

PIN 1

DIMENSIONS:

INCH (MM)

0.018 (0.57)

0.100 (2.54)

0.026 (0.65)
MAX)

0.157 (3.99)

0.150 (3.81)

0.050 (1.27)

0.380 (9.65)

0.370 (9.40)

TYP

0.135 (3.43)

0.125 (3.18)

0.130 (3.30)

0.0375 (0.952)

8-Pin DIP (N)

PIN 1

0.020 (0.51)

0.013 (0.33)

0.0098 (0.249)

0.0040 (0.102)

0.380 (9.65)

0.320 (8.13)

DIMENSIONS:

INCHES (MM)

0.255 (6.48)

0.245 (6.22)

0.300 (7.62)

0.013 (0.330)

0.010 (0.254)

45°

0.010 (0.25)

0.007 (0.18)

0.064 (1.63)

0.045 (1.14)

0.197 (5.0)

0.189 (4.8)

0°–8°

SEATING

PLANE

8-Pin SOIC (M)

0.050 (1.27)

0.016 (0.40)

0.244 (6.20)

0.228 (5.79)

MIC2545A/2549A 14 June 2000

MIC2545A/2549A Micrel

0.65 BSC
(0.026)

4.50 (0.177)

4.30 (0.169)

0.30 (0.012)

0.19 (0.007)

5.10 (0.200)

4.90 (0.193)

1.10 MAX (0.043)

0.15 (0.006)

0.05 (0.002)

6.4 BSC (0.252)

14-Pin TSSOP (TS)

DIMENSIONS:

MM (INCH)

0.20 (0.008)

0.09 (0.003)

8°
0°

1.00 (0.039) REF

0.70 (0.028)

0.50 (0.020)

June 2000 15 MIC2545A/2549A

MIC2545A/2549A Micrel

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

MIC2545A/2549A 16 June 2000