MP5003
3.3V, 1A-3A Programmable Current
Limit Switch with Auto Enable
The Future of Analog IC Technology
DESCRIPTION
The MP5003 is a protection device designed to
protect circuitry on the output (V
OUT
) from
transients on the input (V
IN
). It also protects V
IN
from undesired shorts and transients coming
from the load.
At start up, inrush current is limited by limiting the
slew rate at V
OUT
. The slew rate is controlled by a
small capacitor at the dv/dt pin. The dv/dt pin has
an internal circuit that allows the customer to float
this pin (no connect) and still receive a 1.1ms
ramp time at V
OUT
.
The max load at the output (V
OUT
) is current
limited. This is accomplished by utilizing a sense
FET topology. The magnitude of the current limit
is controlled by an external resistor connected
between the I
LIMIT
pins.
An internal charge pump drives the gate of the
power device, allowing a very low on-resistance
DMOS power FET of just 44mΩ.
V
OUT
is protected from V
IN
being too low or too
high. Under Voltage Lockout (UVLO) assures
that the input is above the minimum operating
threshold, before the power device is turned on.
If V
IN
goes above the high output threshold, the
output voltage will be limited.
FEATURES
Integrated 44mΩ Power FET
Enable/Fault Pin
Adjustable Slew Rate for Output Voltage
Adjustable Current Limit: 1A-3A
Automatically Startup after Thermal
Protection
Over Voltage Limit
Hot Swap
PC Cards
Cell Phones
Laptops
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks
of Monolithic Power Systems, Inc.
APPLICATIONS
TYPICAL APPLICATION
VIN
11
6
+ILIMIT
VIN
VOUT
VOUT
5
4
VOUT
R
LIMIT
8
MP5003
7
-ILIMIT
Enable/Fault
EN
VOUT
VOUT
3
2
9
dv/dt
Cdv/dt
(Optional)
10
GND
VOUT
1
MP5003 Rev. 0.921
2/29/2012
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
1
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