MIC2545A/2549A
Micrel
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) .................................................. +7.0V
Output Voltage (V
OUT
) ............................................... +7.0V
Output Current (I
OUT
) ............................... Internally Limited
Enable Input (V
EN
) ......................................... –0.3V to +7V
Fault Flag Voltage (V
FLG
) ........................................... +7.0V
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
(3) ..........................................................................
2004V
Operating Ratings
(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
)
(4)
.................................................. 100°C/W
Current Limit Set Range
(5)
................................. 0.5A to 3A
Electrical Characteristics
V
IN
= +5V; T
A
= 25°C,
bold
indicates –40°C to +85°C; unless noted
Symbol
Parameter
Supply Current
Condition
Switch off, OUT = open
(6)
Switch on, OUT = open
(6)
V
EN
Enable Input Voltage
Enable high transition
(6)
Enable low transition
(6)
Enable Input Current
V
EN
= V
OH(min)
= 2.4V
V
EN
= V
OL(max)
= 0.8V
Enable Input Capacitance
R
DS(on)
Switch Resistance
Current Limit Factor
Note 7
I
OUT
= 500mA
I
LIMIT
= 0.5A to 3A, V
OUT
= 1V to 4V
(5)
I
LIMIT
= 1A to 2.5A, V
OUT
= 1V to 4V
(5)
Output Leakage Current
t
ON
t
R
t
OFF
t
F
Output Turn-On Delay
Output Turn-On Rise Time
Output Turnoff Delay
Output Turnoff Fall Time
Overtemperature Threshold
Shutdown
Error Flag Off Current
EN Pulse Reset Width
t
SU
V
OL
Notes:
1.
Exceeding the absolute maximum ratings may damage the device.
2.
The device is not guaranteed to function outside its operating ratings.
3.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
4.
Assumes 4 layer PCB is used.
5.
Current limit is determined by:
I
LIMIT
=
230
R
SET
, where R
SET
is in ohms, and 230 is typical current limit factor in volts.
Min
Typ
0.75
90
Max
5
125
150
Units
µA
µA
µA
V
2.4
1.6
1.5
0.01
0.01
1
35
50
300
276
10
5
4.9
0.8
1
1
V
µA
µA
pF
mΩ
V
V
µA
ms
ms
µs
µs
°C
°C
µA
µs
µs
µs
160
184
230
230
1
Switch off, V
OUT
= 0V
R
L
= 10Ω, C
L
= 1µF,
Figures 1a, 1b
R
L
= 10Ω, C
L
= 1µF,
Figure 1a, 1b
R
L
= 10Ω, C
L
= 1µF,
Figure 1a, 1b
R
L
= 10Ω, C
L
= 1µF,
Figure 1a, 1b
T
J
increasing
T
J
decreasing
V
FLG
= 5V
MIC2549A thermal shutdown latch
(7)
MIC2549A
(7)
,
Figure 1c
V
OUT
= 0V to I
OUT
= 2A, I
SET
= 1A
(7)
I
FLG
= 10mA
1
0
1
0.75
2
1.8
25
23
135
120
0.01
1
V
IN
to EN Set-Up
Current-Limit Response Time
Error Flag Output Resistance
40
4
15
Ω
6.
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.
7.
Guaranteed by design but not production tested.
M9999-041204
4
April 2004
MICREL [ MICREL SEMICONDUCTOR ]
