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PDF MP5003 Data sheet ( Hoja de datos )
| Número de pieza | MP5003 | |
| Descripción | 3.3V 1A-3A Programmable Current Limit Switch | |
| Fabricantes | MPS | |
| Logotipo |  |
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The Future of Analog IC Technology
MP5003
3.3V, 1A-3A Programmable Current
Limit Switch with Auto Enable
DESCRIPTION
The MP5003 is a prote ction device designed t o
protect circuitry on t he output (V OUT) from
transients o n the input (VIN). It also protects V IN
from undesired shorts and transients comin g
from the load.
At start up, inrush current is limited by limiting the
slew rate at VOUT. 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) a nd still rece ive a 1.1ms
ramp time at VOUT.
The max l oad at the output (V OUT) is current
limited. This is a ccomplished by utilizing a sense
FET topology. The mag nitude of the current limit
is contro lled by an external resist or connecte d
between the ILIMIT pins.
An internal charge pump drives the gate of the
power device, allowing a very low on-resistance
DMOS power FET of just 44mΩ.
VOUT is protected from V IN being to o low or too
high. Under Voltage L ockout (UVLO) assures
that the inp ut is a bove the minimum operating
threshold, b efore the power device i s turned on.
If V IN goes above the high output t hreshold, th e
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
APPLICATIONS
Hot Swap
PC Cards
Cell Phones
Laptops
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks
of Monolithic Power Systems, Inc.
TYPICAL APPLICATION
VIN
RLIMIT
EN
Cdv/dt
(Optional)
11
6
VIN
+ILIMIT
VOUT 5
7
MP5003
-ILIMIT
VOUT
4
8 Enable/Fault VOUT 3
9 dv/dt
VOUT 2
10 GND
VOUT 1
VOUT
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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1 page  
MP5003 – 3.3V, 1A-3A PROGRAMMABLE CURRENT LIMIT SWITCH WITH AUTO ENABLE
TYPICAL PERFORMANCE CHARACTERISTICS
VIN=3.3V, VEN=3.3V, RLIMIT=24Ω, COUT=10μF, Cdv/dt=1nF, TA=25°C, unless otherwise noted.
Supply Current,Output Enabled Supply Current,Output Disabled Static Drain-Source On-State
vs.Input Voltage
vs.Input Voltage
Resistance vs. Input Voltage
No load, EN floating
1.8
VEN=0V
0. 95
IOUT=1A
70
1.7
0. 9
1.6
65
60
1.5 0.85
55
1.4
0. 8
1.3
50
45
1.2
2. 5
3 3.5
INP UT VO L T AG E (V)
4
0. 75
2. 5
3 3.5
INP UT V OL TAG E (V )
4
40
2.5
3 3.5
INPUT VOLTAGE (V)
4
140
120
100
80
60
40
20
0
0
VIN=3V
VIN=3.3V
VIN=3.6V
VIN=3.9V
0 .5 1 1 .5 2
LOAD CURRENT(A)
2 .5
2.8
2.7
2.6
2 .5
2.4
2.3
2 .5
3 3.5
INPUT VOLTAGE(V)
4
1.8
1.7
1.6
1.5
1.4
2.5
3 3.5
INPUT VOLTAGE(V)
Current Limit Response
vs. Peak Current
No Cout
28
22
16
10
4
3 8 13 18
PEAK CURRENT(A)
Trip and Hold Current
vs. RLIMIT
6
5
4
3 Trip Current
2
1
Hold Current
0
0 20 40
60
80 100 120
4
MP5003 Rev. 0.921
2/29/2012
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
5
5 Page 
MP5003 – 3.3V, 1A-3A PROGRAMMABLE CURRENT LIMIT SWITCH WITH AUTO ENABLE
THERMAL PROTECTION
The MP500 3 only considers a ther mal overloa d
to be a fault . Under a fa ult condition the MP5003
will have two actions:
1) Turn off the output power device.
2) Drive the enable/fault pin to the low level.
The power device will remain off until the d ie
temperature drops below the hysteresis level.
When the die cools d own below the thermal
hysteresis l evel, the MP5003 will restart in the
start up mode and the fault line will be pulled high
through a 2 5uA pull up current. I f the cause o f
Input Voltage
the fault has been rem oved, the o utput will ramp
up in a controlled fashion with the ramp ra
te
controlled b y the d v/dt function. If t he cause of
the fault i s still pre sent, the excess power
dissipation will heat u p the part. When the d ie
temperature reaches the thermal shutdown
temperature, the output will be turned off and the
enable/fault pin will be driven to the low leve l.
This cycle will repeat until the cause of the fault is
removed.
UVLO Threshold
Output Voltage
T0 T1
T2
T3
T5 T7
T4 T6
Output Short (Cause of Fault)
Die Temperature
Thermal Shutdown Temp
Thermal Hysteresis
Fault/Enable Pin
Current Limit
Normal operating current
Output Current
Figure 3―Thermal Protection in Short Condition
The drawing above shows the initial start
up
sequence a nd the occu rrence of a short at the
output.
At time T0 the input volt age begins t o rise. At T1
the input voltage rises a bove the UVLO threshold
and the part starts up. T he output current ramp s
up and settles in at the normal operating curren t
level until time T2.
There is a very sma ll
temperature heating of the d ie in normal
operation.
At time T2 the output is shorted. Th is brings th e
output very close to gro und. The output curren t
increases t o the current limit level and is held
there by the MP5003. Because of the larg e
current and the large voltage acro ss the pow er
device, the die will begin to heat up.
At time T3 t he die temperature is at the therma l
shutdown level and the part will tu rn the powe r
device off. The enable/fault pin is driven to th e
low level. Once the po wer device is off, the d ie
temperature will begin to drop.
MP5003 Rev. 0.921
2/29/2012
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
11
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| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MP5003.PDF ] | |
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