MIC2545A Datasheet, PDF (3/16 Pages) Micrel Semiconductor – Programmable Current Limit High-Side Switch

MIC2545A/2549A
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
Micrel
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
Electrical Characteristics
V_IN = +5V; T_A = 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
Enable low transition, Note 1
2.4
1.6
V
1.5
0.8
V
Enable Input Current
Enable Input Capacitance
V_EN = V_OH(min) = 2.4V
V_EN = V_OL(max) = 0.8V
Note 7
0.01
1
µA
0.01
1
µA
1
pF
R_DS(on)
t_ON
t_R
t_OFF
t_F
Switch Resistance
Current Limit Factor
Output Leakage Current
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
I_OUT = 500mA
35
50
mΩ
I_LIMIT = 0.5A to 3A, V_OUT = 1V to 4V, Note 5 160
230
300
V
I_LIMIT = 1A to 2.5A, V_OUT = 1V to 4V, Note 5 184
230
276
V
Switch off, V_OUT = 0V
1
10
µA
R_L = 10Ω, C_L = 1µF, Figures 1a, 1b
1
2
5
ms
R_L = 10Ω, C_L = 1µF, Figure 1a, 1b
0.75 1.8
4.9
ms
R_L = 10Ω, C_L = 1µF, Figure 1a, 1b
25
µs
R_L = 10Ω, C_L = 1µF, Figure 1a, 1b
23
µs
T_J increasing
135
°C
T_J decreasing
120
°C
V_FLG = 5V
0.01
1
µA
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 I_OUT = 2A, I_SET = 1A, Note 7
40
µs
V_OL
Error Flag Output Resistance
I_FLG = 10mA
4
15
Ω
Note 1.
Note 2.
Note 3.
Note 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.
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.
Note 6.
Note 7.
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.
Assumes 4 layer PCB is used.
Guaranteed by design but not production tested.
June 2000
3
MIC2545A/2549A