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Micrel, Inc.
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 (Ts)......................... –65°C to +150°C
MIC2545A/2549A
Operating Ratings (2)
Supply Voltage (V IN )..................................... +2.7V to +5.5V
Ambient Temperature (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
Junction Temperature (T J ) ........................Internally Limited
Lead Temperature (soldering, 5sec.)......................... 260°C
ESD Rating (3) ..............................................................1500V
Electrical Characteristics (4)
V IN = + 5V; T A = 25°C, bold values indicate –40°C to +85°C, unless noted.
Symbol
Parameter
Condition
Min.
Typ.
Max.
Units
Switch Off, OUT = Open
(6)
0.75
5
μA
Switch On, OUT = Open
Supply Current
(6)
90
125
150
μA
Enable Low Transition
V EN
Enable Input Voltage
Enable Input Current
Enable High Transition (6)
(6)
V EN = V OH(MIN) = 2.4V
V EN = V OL(MAX) = 0.8V
2.4
1.6
1.5
0.01
0.01
0.8
1
1
V
μA
Enable Input Capacitance
Note 7
1
pF
R DS(ON)
Switch Resistance
I OUT = 500mA
35
50
m ?
I LIMIT = 0.5A to 3A, V OUT = 1V to 4V
I LIMIT = 1A to 2.5A, V OUT = 1V to 4V
Current-Limit Factor
Output Leakage Current
Switch Off, V OUT = 0V
(5)
(5)
184
195
230
230
1
276
264
10
V
μA
t ON
t R
t OFF
Output Turn-On Delay
Output Turn-On Rise Time
Output Turn-Off Delay
R L = 10 ? , C L = 1μF, Figures 1a, 1b
R L = 10 ? , C L = 1μF, Figures 1a, 1b
R L = 10 ? , C L = 1μF, Figures 1a, 1b
1
0.75
2
1.8
25
5
4.9
ms
ms
μs
Notes:
1.
2.
3.
4.
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
Assumes 4-layer PCB is used.
SET
5.
Current limit is determined by I LIMIT =
230
R
, where R SET is in ? s, and 230 is typical current-limit factor in volts.
6.
7.
Off is ≤ 0.8V and on is ≥ 2.4V for the MIC2545A-1 and MIC2549A-1. Off is ≥ 2.4V and on is ≤ 9.8V for the MIC2545A-2 and MIC2549A-2. The
enable input has about 100mV of hysteresis.
Guaranteed by design but not production tested.
June 2011
4
M9999-062711-A
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