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Micrel, Inc.
Absolute Maximum Ratings (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 V IN +0.3V
Fault Flag Voltage (V FLG )............................................+6.0V
Fault Flag Current (I FLG ) .............................................50mA
Storage Temperature (T S ) ........................ –65 ° C to +150 ° C
MIC2546/2547
Operating Ratings (2)
Supply Voltage (V IN ) .................................... +2.7V to +5.5V
Current Limit Set Range......................................0.1 to 1.5A
Ambient Temperature Range (T A ) .............. –40 ° C to +85 ° C
Package Thermal Resistance
SOP ( θ JA ) .........................................................120 ° C/W
TSSOP ( θ JA ) ....................................................100 ° C/W
Junction Temperature (T J ) ........................Internally Limited
Lead Temperature (soldering 5 sec.)......................... 260 ° C
ESD Rating, Note 3 ....................................................... 2kV
Electrical Characteristics (4)
V IN = +5V; T A = 25°C, bold values indicate –40°C to +85°C, unless noted.
Symbol
Parameter
Supply Current
Condition
Switch off, OUT = open, Note 4
Min
Typ
1.5
Max
10
Units
μA
Switch on, OUT = open, Note 4
200
320
μA
V EN
Enable Input Voltage
Enable Input Current
Enable Input Capacitance
Enable High, Note 4
Enable Low, Note 4
V EN = V OH(MIN) = 2.4V
V EN = V OH(MAX) = 0.8V
Note 5
2.4
1.7
1.5
0.01
0.01
1
0.8
1
1
V
V
μA
μA
pF
R DS(ON)
Switch Resistance
I OUT = 500mA
80
120
m ?
Current Limit Factor, Note 6
I OUT = 500mA to 1.5A, V OUT = 1.0V to 4.0V
184
230
276
V
Note 6
Output Leakage Current
Swich off
1
10
μA
t ON
t R
t OFF
t F
Output Turn-On Delay
Output Turn-On Rise Time
Output Turn-Off Delay
Output Turn-Off Fall Time
R L = 10 ? , C L = 1μF, Figure 1a and 1b
R L = 10 ? , C L = 1μF, Figure 1a and 1b
R L = 10 ? , C L = 1μF, Figure 1a and 1b
R L = 10 ? , C L = 1μF, Figure 1a and 1b
1
1
2
2
22
21
5
5
ms
ms
μs
μs
Overtemperature Threshold
Shutdown
T J increasing
T J decreasing
140
130
°C
°C
Error Flag Output Resisitance
Error Flag Off Current
EN Pulse Reset Width
V IN to EN Set-Up
Current-Limit Response Time
Overcurrent FLG Response
Time
V IN = 5V, I L = 10μA
V IN = 3.3V, I L = 10μA
V FLG = 5V
MIC2547 Thermal Shutdown Latch
MIC2547, Note 5
V OUT = oV
V OUT = V IN /2 to FLG low
5
0
4
5
0.01
25
5
15
20
1
?
?
μA
μs
μs
μs
μs
Notes:
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 MIC2546-1 and MIC2547-1. Off is ≥ 2.4V and on is ″ 0.8V for the MIC2546-2 and MIC2547-2. The enable
input has about 200mV of hysteresis.
January 2008
4
M9999-012508-A
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