MIC2545A-1BN datasheet(3/16 Pages) MICREL

Part #	MIC2545A-1BN

Description	Programmable Current Limit High-Side Switch

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Manufacturer	MICREL [Micrel Semiconductor]

Direct Link	http://www.micrel.com

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3 / 16 page

June 2000

3

MIC2545A/2549A

Micrel

Electrical Characteristics

V

IN = +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

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

V

EN = VOH(min) = 2.4V

0.01

1

µA

V

EN = VOL(max) = 0.8V

0.01

1

µA

Enable Input Capacitance

Note 7

1pF

R

DS(on)

Switch Resistance

I

OUT = 500mA

35

50

m

Ω

Current Limit Factor

I

LIMIT = 0.5A to 3A, VOUT = 1V to 4V, Note 5

160

230

300

V

I

LIMIT = 1A to 2.5A, VOUT = 1V to 4V, Note 5

184

230

276

V

Output Leakage Current

Switch off, V

OUT = 0V

1

10

µA

t

ON

Output Turn-On Delay

R

L = 10Ω, CL = 1µF, Figures 1a, 1b

125

ms

t

R

Output Turn-On Rise Time

R

L = 10Ω, CL = 1µF, Figure 1a, 1b

0.75

1.8

4.9

ms

t

OFF

Output Turnoff Delay

R

L = 10Ω, CL = 1µF, Figure 1a, 1b

25

µs

t

F

Output Turnoff Fall Time

R

L = 10Ω, CL = 1µF, Figure 1a, 1b

23

µs

Overtemperature Threshold

T

J increasing

135

°C

Shutdown

T

J decreasing

120

°C

Error Flag Off Current

V

FLG = 5V

0.01

1

µA

EN Pulse Reset Width

MIC2549A thermal shutdown latch, Note 7

1

µs

t

SU

V

IN to EN Set-Up

MIC2549A, Note 7, Figure 1c

0

µs

Current-Limit Response Time

V

OUT = 0V to IOUT = 2A, ISET = 1A, Note 7

40

µs

V

OL

Error Flag Output Resistance

I

FLG = 10mA

4

15

Ω

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.

The enable input has about 100mV of hysteresis.

Note 5.

Current limit is determined by: I

R

LIMIT

SET

=

230

, where R

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

Note 6.

Assumes 4 layer PCB is used.

Note 7.

Guaranteed by design but not production tested.

Absolute Maximum Ratings (Note 1)

Supply Voltage (V

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

Output Voltage (V

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

Output Current (I

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

Enable Input (V

EN) ......................................... –0.3V to +6V

Fault Flag Voltage (V

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

Fault Flag Current (I

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

Storage Temperature (T

S) ....................... –65°C to +150°C

Junction Temperature (T

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

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

°C

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

Operating Ratings (Note 2)

Supply Voltage (V

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

Ambient Temperature Range (T

A) ............. –40°C to +85°C

Package Thermal Resistance

PDIP

(θ

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

SOIC

(θ

JA) ......................................................... 160°C/W

TSSOP

(θ

JA), Note 6 ........................................ 100°C/W

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

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