MPS MP5003EQ

MP5003
3.3V, 1A-3A Programmable Current
Limit Switch with Auto Enable
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP5003 is a protection device designed to
protect circuitry on the output (VOUT) from
transients on the input (VIN). It also protects VIN
from undesired shorts and transients coming
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) and still receive a 1.1ms
ramp time at VOUT.

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




The max load at the output (VOUT) 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 ILIMIT pins.
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of Monolithic Power Systems, Inc.
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 VIN 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 VIN goes above the high output threshold, the
output voltage will be limited.
TYPICAL APPLICATION
VIN
11
6
+ILIMIT
VIN
MP5003
RLIMIT
7 -ILIMIT
8
EN
Enable/Fault
9 dv/dt
Cdv/dt
(Optional)
MP5003 Rev. 0.921
2/29/2012
VOUT
10
GND
VOUT
VOUT
VOUT
5
VOUT
4
3
2
VOUT 1
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MP5003 – 3.3V, 1A-3A PROGRAMMABLE CURRENT LIMIT SWITCH WITH AUTO ENABLE
ORDERING INFORMATION
Part Number*
Package
Top Marking
Free Air Temperature (TA)
MP5003EQ
QFN10 (3x3)
7M
-20C to +85C
* For Tape & Reel, add suffix –Z (e.g. MP5003EQ–Z);
For RoHS Compliant Packaging, add suffix –LF (e.g. MP5003EQ–LF–Z)
PACKAGE REFERENCE
TOP VIEW
VOUT
1
VOUT
2
VOUT
3
VOUT
4
VOUT
5
10 GND
EXPOSED
PAD
VIN
ABSOLUTE MAXIMUM RATINGS (1)
VIN, VOUT, +ILIMIT, -ILIMIT .................................. 22V
dv/dt, ENABLE/FAULT .................................. 6V
Continuous Power Dissipation (TA=+25oC) (2)
............................................................. 2.5W
Storage Temperature ............... -65°C to +155C
Junction Temperature…..……..-20C to +150C
Recommended Operating Conditions
Input Voltage Operating Range……….2.5V to 6V
Operating Junct.Temp(TJ)……..-20C to +125C
MP5003 Rev. 0.921
2/29/2012
9
dv/dt
8
ENABLE/FAULT
7
-ILIMIT
6
+ILIMIT
Thermal Resistance
(3)
θJA
θJC
QFN10 .................................... 50 ...... 12 ... C/W
Notes:
1) Exceeding these ratings may damage the device..
2) The maximum allowable power dissipation is a function of the
maximum junction temperature TJ(MAX) ， the junction-toambient thermal resistance JA，and the ambient temperature
TA, the maximum allowable power dissipation at any ambient
temperature is calculated using: PD(MAX)=(TJ(MAX)-TA)/ JA.
Exceeding the maximum allowable power dissipation will
cause excessive die temperature, and the regulator will go
into thermal shutdown. Internal thermal shutdown circuitry
protects the device from permanent damage.
o
Reduce 0.2 Watts for every 10 C ambient temperature
increasing
3) Measured on JESD51-7 4-layer board.
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MP5003 – 3.3V, 1A-3A PROGRAMMABLE CURRENT LIMIT SWITCH WITH AUTO ENABLE
ELECTRICAL CHARACTERISTICS
VIN = 3.3V, RLIMIT=24Ω, COUT= 10μF, TJ=25C, unless otherwise noted.
Parameters
Power FET
Symbol
Delay Time
tDLY
ON Resistance
RDSon
Condition
Enabling of chip to
ID=100mA with a 12Ω
resistive load
TJ=+25°C
TJ=+80°C, Note 4
Off State Output Voltage
VOFF
Enable=0V,RL=500Ω
Thermal Latch
Shutdown Temperature
Under/Over Voltage Protection
TSD
Note 4
Output Clamping Voltage
VCLAMP
Under Voltage Lockout
VUVLO
Under Voltage Lockout (UVLO)
Hysteresis
Current Limit
Short Circuit Current Limit
(Hold Current)
Trip Current
dv/dt Circuit
Rise Time
Enable/Fault
Low Level Input Voltage
High Level Input Voltage
High State Maximum Voltage
Low Level Input Current (Sink)
Min
Overvoltage Protection
VIN = 6V
Turn on,
Voltage going high
Typ
Max
0.2
44
95
Units
ms
82
120
175
mΩ
mV
°C
3.63
4.03
4.43
V
2.15
2.35
2.5
V
100
400
mV
VHYST
ILIM
RLIMIT=24Ω, Note 4
1.2
1.55
1.9
A
ILIM-OL
RLIMIT=24Ω, Note 4
2.0
2.5
3.0
A
Tr
Float dv/dt pin, Note 5
0.64
1.1
2.0
ms
VIL
VIH
Output Disabled
Output Enabled
0.5
-75
V
V
V
μA
5
Units
VIN
V
VI (MAX)
IIL
Maximum Fanout for Fault Signal
2.5
VENABLE=0V
Total number of chips that
can be connected for
simultaneous shutdown
Note 6
Maximum Voltage on Enable Pin
Total Device
VMAX
Bias Current
IBIAS
Device Operational
Thermal Shutdown
Minimum Operating Voltage for
UVLO
VMIN
Enable<0.5V
3.25
-55
1.5
0.9
2.0
2.0
mA
V
Notes:
4) Guaranteed by design.
5) Measured from 10% to 90%.
6) Maximum Input Voltage to be≤6V if VIN ≥ 6V. Maximum Input Voltage to be VIN if VIN ≤ 6V.
MP5003 Rev. 0.921
2/29/2012
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MP5003 – 3.3V, 1A-3A PROGRAMMABLE CURRENT LIMIT SWITCH WITH AUTO ENABLE
PIN FUNCTIONS
Pin #
1-5
6
7
8
9
10
11
Name
VOUT
+ILIMIT
-ILIMIT
Description
This pin is the VOUT of the internal power FET and the output terminal of the IC.
A resistor between these pins sets the overload and short circuit current limit levels.
A resistor between these pins sets the overload and short circuit current limit levels.
The Enable/Fault pin is a bi-directional interface. It can be used to enable the output
of the device by floating the pin, or disable the chip by pulling it to ground (using an
Enable/Fault
open drain or open collector device). If a thermal fault occurs, the voltage on this pin
will drive to ground, automatically.
The internal dv/dt circuit controls the slew rate of the output voltage at turn on. It has
an internal capacitor that allows it to ramp up over the period of 1.1ms. An external
dv/dt
capacitor can be added to this pin to increase the ramp time. If an additional time
delay is not required, this pin should be left open.
GND
Negative Input Voltage to the Device. This is used as the internal reference for the IC.
VIN
Positive input voltage to the device (Exposed Pad).
MP5003 Rev. 0.921
2/29/2012
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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
Resistance vs. Input Voltage
vs.Input Voltage
VEN=0V
No load, EN floating
1.7
1.6
1.5
1.4
1.3
1.2
2.5
3
3.5
4
65
60
0. 85
55
50
0. 8
45
0. 75
2. 5
3
3. 5
40
4
140
VIN=3.3V
80
VIN=3.6V
60
VIN=3.9V
40
20
0
0 .5
1
1 .5
2
2 .5
2.7
H O LD C U R R EN T(A )
100
2.6
2 .5
2.4
2.3
2 .5
3
3 .5
22
16
10
4
MP5003 Rev. 0.921
2/29/2012
1.5
3
18
3.5
4
INPUT VOLTAGE(V)
Trip and Hold Current
vs. RLIMIT
TRIP CURRENT & HOLD CURRENT(A)
RESPONSE TIME(us)
No Cout
8
13
PEAK CURRENT(A)
1.6
1.4
2.5
4
Current Limit Response
vs. Peak Current
3
4
1.7
INPUT VOLTAGE(V)
LOAD CURRENT(A)
28
3
3.5
INPUT VOLTAGE (V)
1.8
2.8
VIN=3V
120
2.5
INP UT V OL T AG E (V )
TRIP CURRENT(A)
INPUT TO OUTPUT VOLTAGE(mV)
70
0. 9
INP UT VO L T AG E (V)
0
IOUT=1A
0. 95
S UP P L Y C UR R E NT (mA)
S UP P L Y C UR R E NT (mA )
1.8
6
5
4
3
Trip Current
2
1
Hold Current
0
0
20
40
60
80
100 120
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MP5003 – 3.3V, 1A-3A PROGRAMMABLE CURRENT LIMIT SWITCH WITH AUTO ENABLE
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN=3.3V, VEN=3.3V, RLIMIT=24Ω, COUT=10μF, Cdv/dt=1nF, TA=25°C, unless otherwise noted.
Turn on Delay and Rise Time
Cdv/dt=1nF
Turn on Delay and Rise Time
No Cdv/dt
Turn off Delay and Fall Time
No Cdv/dt
COUT=10uF,no load
COUT=10uF,no load
COUT=10uF,no load
EN
2V/div
EN
2V/div
EN
2V/div
VOUT
2V/div
VOUT
2V/div
VOUT
2V/div
10ms/div
1ms/div
10ms/div
Short Circuit Current,
Device Enabled into Short
No Cdv/dt
EN
2V/div
EN
2V/div
VOUT
2V/div
VOUT
2V/div
IOUT
1A/div
IOUT
1A/div
EN
2V/div
IOUT
1A/div
1ms/div
100us/div
10ms/div
Short Circuit Current,
Device Enabled into Short,
Thermal Shut down, and
Auto Start Up
Trip Current with Ramped
Load on Enabled Device
Inrush Current with Different
Load Capacitance
No Cdv/dt
No Cdv/dt
EN Floating, No Cdv/dt
VOUT
2V/div
EN
2V/div
2200uF
EN
2V/div
1000uF
470uF
IOUT
500mA/div
IOUT
1A/div
IOUT
1A/div
400ms/div
MP5003 Rev. 0.921
2/29/2012
2ms/div
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1ms/div
6
MP5003 – 3.3V, 1A-3A PROGRAMMABLE CURRENT LIMIT SWITCH WITH AUTO ENABLE
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN=3.3V, VEN=3.3V, RLIMIT=24Ω, COUT=10μF, Cdv/dt=1nF, TA=25°C, unless otherwise noted.
Current Limit
(trip hold thermal shut
down Auto Start Up)
No Cdv/dt
VOUT
2V/div
VOUT
2V/div
VOUT
2V/div
Peak Current
Peak Current
IOUT
2A/div
Response Time
20us/div
MP5003 Rev. 0.921
2/29/2012
IOUT
2A/div
Response Time
IOUT
1A/div
20us/div
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200ms/div
7
MP5003 – 3.3V, 1A-3A PROGRAMMABLE CURRENT LIMIT SWITCH WITH AUTO ENABLE
BLOCK DIAGRAM
VIN
Enable/
Fault
Enable
Charge
Pump
VOUT
Thermal
Shutdown
Current
Limit
-ILIMIT
+ILIMIT
UVLO
Voltage
Clamp
dv/dt
Control
dv/dt
GND
Figure 1—Function Block Diagram
MP5003 Rev. 0.921
2/29/2012
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MP5003 – 3.3V, 1A-3A PROGRAMMABLE CURRENT LIMIT SWITCH WITH AUTO ENABLE
CURRENT LIMIT
The desired current limit is a function of the
external current limit resistor.
Table 1—Current Limit vs. Current Limit Resistor
(VIN=3.3V)
Current Limit
Resistor
(Ω)
Trip Current
(A)
Hold Current
(A)
13
24
50
100
4
2.5
1.7
1.37
3.2
1.55
0.77
0.37
RISE TIME
The rise time is a function of the capacitor
(Cdv/dt) on the dv/dt pin.
Table 2—Rise Time vs. Cdv/dt
Cdv/dt
Rise Time
(TYPICAL)
(ms)
none
50pF
500pF
1nF
1.1
2.2
12.3
23.5
* Notes: Rise Time = KRT*(50pF+Cdv/dt), KRT =22E6
The “rise time” is measured by from 10% to 90%
of output voltage.
U
When the part is active, if load reaches trip
current (minimum threshold current triggering
overcurrent protection) or a short is present, the
part switches into to a constant-current (hold
current) mode. Part will enter thermal cycling only
if the overcurrent condition stays long enough to
trigger thermal protection.
However, when the part is powered up by VCC or
EN, the load current should be smaller than hold
current. Otherwise, the part can’t be fully turned
on.
In a typical application using a current limit
resistor of 24Ω, the trip current will be 2.5A and
the hold current will be 1.55A. If the device is in
its normal operating state and passing 1.5A it will
need to dissipate only 99mW with the very low on
resistance of 44mΩ. For the package dissipation
of 50°C/Watt, the temperature rise will only be +
5°C. Combined with a 25°C ambient, this is only
30°C total package temperature.
During a short circuit condition, the device now
has 3.3V across it and the hold current clamps at
1.55A and therefore must dissipate 5W. At
50°C/watt, if uncontrolled, the temperature would
rise above the thermal protection threshold
(+175°C) and the device will shutdown to cause
the temperature to drop.
Input
Output
90%
Enable
10%
Rise Time
t
Figure 2—Rise Time
FAULT AND ENABLE PIN
The Enable/Fault Pin is a Bi-Directional I/O with a
weak pull up current (25uA typical). It functions to
enable/disable the part.
Enable pin as an input:
1. Low disables the part.
2. High enables the part.
Enable pin as an output:
1. The pull up current may (if not over
ridden) allow a “wired nor” pull up to
enable the part.
2. An under voltage will cause a low on the
enable pin.
3. A thermal fault will cause a low level on
the enable pin.
Proper heat sink must be used if the device is
intended to supply the hold current and not
shutdown. Without a heat sink, hold current
should be maintained below 909mA at + 25°C
and below 545mA at +85°C to prevent the device
from activating the thermal shutdown feature.
MP5003 Rev. 0.921
2/29/2012
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MP5003 – 3.3V, 1A-3A PROGRAMMABLE CURRENT LIMIT SWITCH WITH AUTO ENABLE
There are 4 types of faults, and each fault has a
direct and indirect effect on the Enable/Fault pin
and the internal fault flag. In a typical application
where there are multiple MP5003 chips in a
system, the enable/fault lines are typically
connected together.
UNDER VOLTAGE LOCK OUT OPERATION
If the supply (input) is below the UVLO threshold,
the output is disabled, and the fault line is driven
low.
When the supply goes above the UVLO
threshold, the output is enabled and the
Enable/fault pin is released. When the
Enable/fault pin is released it will be pulled high
by a 25uA current source. No external pull up
resistor is required. In addition, the pull up
voltage is limited to 5 volts.
Table 3—Fault Function Influence in Application
Fault description
Internal action
Short/over current
Limit current
Under Voltage
Output is turned off
Over Voltage
Limit output voltage
Thermal Shutdown
Shutdown part. The
part retries to start
up automatically
MP5003 Rev. 0.921
2/29/2012
Effect on Fault
Pin
none
Internally drives
Enable/Fault pin to
Logic low
None
Internally drives
Enable/Fault pin
to low level, and
after part cools
down, Enable/Fault
pin will be pulled
high
Effect on
Flag
none
Flag is
reset
None
Flag is Set
at thermal
shut down,
and is set
to high
after auto
start up.
Effect on secondary Part
none
Secondary part output is
disabled, and fault flag is
reset.
None
Secondary part output is
disabled when thermal
shut down, and is enabled
after MP5003 auto start up.
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MP5003 – 3.3V, 1A-3A PROGRAMMABLE CURRENT LIMIT SWITCH WITH AUTO ENABLE
THERMAL PROTECTION
The MP5003 only considers a thermal overload
to be a fault. Under a fault 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 die
temperature drops below the hysteresis level.
When the die cools down below the thermal
hysteresis level, the MP5003 will restart in the
start up mode and the fault line will be pulled high
through a 25uA pull up current. If the cause of
the fault has been removed, the output will ramp
up in a controlled fashion with the ramp rate
controlled by the dv/dt function. If the cause of
the fault is still present, the excess power
dissipation will heat up the part. When the die
temperature reaches the thermal shutdown
temperature, the output will be turned off and the
enable/fault pin will be driven to the low level.
This cycle will repeat until the cause of the fault is
removed.
Input Voltage
UVLO Threshold
Output Voltage
T0
T7
T5
T1
T2
T3
T4
T6
Output Short (Cause of Fault)
Thermal Shutdown Temp
Thermal Hysteresis
Die Temperature
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 and the occurrence of a short at the
output.
At time T0 the input voltage begins to rise. At T1
the input voltage rises above the UVLO threshold
and the part starts up. The output current ramps
up and settles in at the normal operating current
level until time T2. There is a very small
temperature heating of the die in normal
operation.
MP5003 Rev. 0.921
2/29/2012
At time T2 the output is shorted. This brings the
output very close to ground. The output current
increases to the current limit level and is held
there by the MP5003. Because of the large
current and the large voltage across the power
device, the die will begin to heat up.
At time T3 the die temperature is at the thermal
shutdown level and the part will turn the power
device off. The enable/fault pin is driven to the
low level. Once the power device is off, the die
temperature will begin to drop.
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MP5003 – 3.3V, 1A-3A PROGRAMMABLE CURRENT LIMIT SWITCH WITH AUTO ENABLE
At time T4 the part has cooled down below the
thermal hysteresis level. The enable pin goes
high and the part turns on again. But the short is
still present, causing the die temperature to
increase. At time T5 the power device turns off
and the Enable/Fault pin is driven to the low
level, again. The temperature begins to fall.
The cycle between times T3, T4 and T5 could
repeat indefinitely, but at time T6 the short is
removed. At time T7 the die temperature is below
the thermal hysteresis level and the part turns on
once again. This time there is no short, so the
output starts in normal operation and the die
temperature cools down to the normal operating
range.
PCB LAYOUT
PCB layout is very important to achieve stable
operation. Please follow these guidelines and
take below figure for reference.
Place Rlimit close to Ilimit pin, Cdv/dt close to
dv/dt pin and input cap close to VIN (Exposed
Pad). Keep the N/C pin float. Put vias in thermal
pad and ensure enough copper area near VIN
and VOUT to achieve better thermal
performance.
C4
RLIMIT
Cdv/dt
C2
Top Layer
Bottom Layer
Figure 4—PCB Layout
MP5003 Rev. 0.921
2/29/2012
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MP5003 – 3.3V, 1A-3A PROGRAMMABLE CURRENT LIMIT SWITCH WITH AUTO ENABLE
PACKAGE INFORMATION
QFN10 (3mm x 3mm)
2.90
3.10
0.30
0.50
PIN 1 ID
MARKING
0.18
0.30
2.90
3.10
PIN 1 ID
INDEX AREA
1.45
1.75
PIN 1 ID
SEE DETAIL A
10
1
2.25
2.55
0.50
BSC
5
6
TOP VIEW
BOTTOM VIEW
PIN 1 ID OPTION A
R0.20 TYP.
PIN 1 ID OPTION B
R0.20 TYP.
0.80
1.00
0.20 REF
0.00
0.05
SIDE VIEW
DETAIL A
NOTE:
2.90
0.70
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH.
3) LEAD COPLANARITY SHALL BE 0.10 MILLIMETER MAX.
4) DRAWING CONFORMS TO JEDEC MO-229, VARIATION VEED-5.
5) DRAWING IS NOT TO SCALE.
1.70
0.25
2.50
0.50
RECOMMENDED LAND PATTERN
NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third
party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not
assume any legal responsibility for any said applications.
\MP5003 Rev. 0.921
2/29/2012
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