MIC2545A_04 Datasheet, PDF (4/16 Pages) Micrel Semiconductor – Programmable Current Limit High-Side Switch

MIC2545A/2549A
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
Micrel
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
STSOSICOP(θ_J(Aθ)_JA..).₍.₄..₎.....................................................................................................
160°C/W
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
Condition
Min Typ Max Units
Supply Current
V_EN
Enable Input Voltage
Switch off, OUT = open⁽⁶⁾
Switch on, OUT = open⁽⁶⁾
Enable high transition⁽⁶⁾
Enable low transition⁽⁶⁾
0.75
5
µA
90
125
µA
150
µA
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
t_SU
V_OL
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
V_IN to EN Set-Up
Current-Limit Response Time
Error Flag Output Resistance
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⁾
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
35
50
mΩ
160 230 300
V
184 230 276
V
1
10
µA
1
2
5
ms
0.75 1.8
4.9
ms
25
µs
23
µs
135
°C
120
°C
0.01
1
µA
1
µs
0
µs
40
µs
4
15
Ω
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.
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