MPS MP5017 3v-.5.5v, 1a â 5a current limit switch with over-voltage clamp and reverse blocking in 2mmx3mm qfn package Datasheet

MP5017
The Future of Analog IC Technology
FEATURES
DESCRIPTION
The MP5017 is a protection device designed to
protect circuitry on the output from transients
from the input. Also, it protects the input from
unwanted shorts and transients coming from
the output.
During start-up, the inrush current is controlled
by limiting the slew rate at the output. The slew
rate is controlled with a small capacitor at
DV/DT.
The maximum load at the output is current
limited. The magnitude of the current limit is
controlled by an external resistor from ILIMIT to
GND. By controlling the gate voltages with a
pair of N-channel MOSFETs, any current
flowing from the output to the input is blocked.
Under-voltage lockout (UVLO) ensures that the
input is above the minimum operating threshold
before the power device is turned on. If the
input voltage rises above 5.8V, the output
voltage is limited quickly to 5.8V. SAS/OV is
used to program the input over-voltage
protection threshold.
Fault is an open-drain output that reports a fail
mode (low level) when any over-current, overtemperature, or output over-voltage is detected.
The MP5017 is available
(2mmx3mm) package.
3V-.5.5V, 1A – 5A Current Limit Switch with
Over-Voltage Clamp and Reverse Blocking
in 2mmx3mm QFN Package
in
a
QFN-12
•
•
•
•
•
•
•
•
•
•
•
•
•
•
3V to 5.5V Continuous Operating Input
Range
16V Absolute Maximum Input Voltage
Output Discharge
SAS/OV Disable to Support DEVSLP or
POWER_DOWN
5.8V Fast Output OVP Response
Reverse Current Blocking
Integrated 45mΩ RDS(ON) Power FET
Adjustable Current-Limit through ILIMIT
210μA Low Quiescent Current
Programmable Soft-Start Time through
DV/DT
Fast Response for Hard-Short Protection
Fault Indication for Over-Current, OverTemperature, and Output Over-Voltage
OTP Auto-Retry with 76ms Recovery
Delay
Available in a QFN-12 (2mmx3mm)
Package
APPLICATIONS
•
•
•
•
•
HDD and SSD
Hot Swap
Wireless Modem Data Cards
PC Cards
USB Power Distribution
All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For
MPS green status, please visit the MPS website under Quality Assurance.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
MP5017 Rev.1.0
10/15/2015
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MP5017 – 3V-5.5V, 1A-5A PROGRAMMABLE CURRENT LIMIT SWITCH
ORDERING INFORMATION
Part Number*
Package
Top Marking
MP5017GD
QFN-12 (2mmx3mm)
See Below
* For Tape & Reel, add suffix –Z (e.g. MP5017GD–Z)
TOP MARKING
ANT: Product code of the MP5017GD
Y: Year code
LLL: Lot number
PACKAGE REFERENCE
QFN-12 (2mmx3mm)
MP5017 Rev.1.0
10/15/2015
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MP5017 – 3V-5.5V, 1A-5A PROGRAMMABLE CURRENT LIMIT SWITCH
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance
VIN ...................................................-0.3V to 16V
VOUT ............................................................. 6.3V
All other pins ...................................-0.3V to +6V
Junction temperature ............... -40°C to +150°C
Lead temperature .....................................260°C
(2)
Continuous power dissipation (TA = +25°C)
QFN-12 (2mmx3mm) ................................. 1.8W
QFN-12 (2mmx3mm)...............70.......15....°C/W
Recommended Operating Conditions
(3)
Continuous operation (VIN).................3V to 5.5V
Supply maximum transient (VIN) .................. 16V
Operating junction temp. (TJ) ... -40°C to +125°C
MP5017 Rev.1.0
10/15/2015
(4)
θJA
θJC
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 θJA, and the ambient temperature
TA. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by PD (MAX) = (TJ
(MAX)-TA)/θJA. Exceeding the maximum allowable power
dissipation produces an excessive die temperature, causing
the regulator to go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7, 4-layer PCB.
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MP5017 – 3V-5.5V, 1A-5A PROGRAMMABLE CURRENT LIMIT SWITCH
ELECTRICAL CHARACTERISTICS
VIN = 5V, RLIMIT = 499Ω, COUT = 10µF, TJ = 25°C, unless otherwise noted.
Parameter
Symbol
Condition
Min
Typ
Max
Units
310
15
120
μA
μA
μA
1
mΩ
mΩ
μs
μA
2.95
V
Supply Current
Quiescent current
Power FET
On resistance
On resistance(5)
Turn-on delay
Off-state leakage current
Under-/Over-Voltage Protection
Under-voltage lockout
threshold
UVLO hysteresis
Output over-voltage clamp
voltage
Output over-voltage response
time(6)
IQ
EN, no load
EN = 0, SAS/OV = 0V
SAS/OV = 3V, EN = 5V
210
10
RDSon
RDSon
Tdelay
IOFF
TJ = 25°C
TJ = 80°C
IOUT = 0A, CDV/DT = 1nF
VIN = 14V, EN = 0V
45
54
160
VUVLO
UVLO rising threshold
2.45
VUVLOHYS
2.7
250
5.5
VOVLO
tOUT_OV
COUT = 10µF,
add 10Ω load resistor,
VIN = 5V to 7V/20µs
IDV/DT
Short DV/DT to GND,
or add DV/DT cap
mV
5.8
6.1
V
10
20
μs
4.5
6.5
8.5
μA
2
2.4
2.8
A
DV/DT
DV/DT current
Current Limit
Current limit at normal
operation
IReverse
Any value of RLIMIT
ILimit_NO
Current limit response time(6)
(6)
Secondary current limit
Reverse Current Limit
Reverse current limit
Reverse current limit deglitch
time(6)
Secondary reverse current
limit(6)
Secondary reverse current
limit response time(6)
Enable
EN rising threshold
EN hysteresis
EN pull-up current
MP5017 Rev.1.0
10/15/2015
ILimitH
RLIMIT = 499Ω,
VOUT drops 10%
RLIMIT = 1.4kΩ,
VOUT drops 10%
ILIMIT = 3A,
add 1Ω load resistor
Any value of RLIMIT
tCL
-5
tReverse
IReverseH
tSC
VEN_RISING
VEN_HYS
IEH_PL
0.9
A
10
μs
7.5
A
-50
-200
mA
80
μs
Fast response
-1
A
VIN_DV/DT = -5V/100µs
8
µs
1.4
VENABLE = 0V
1.47
200
3.4
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1.55
V
mV
μA
4
MP5017 – 3V-5.5V, 1A-5A PROGRAMMABLE CURRENT LIMIT SWITCH
ELECTRICAL CHARACTERISTICS (continued)
VIN = 5V, RLIMIT = 499Ω, COUT = 10µF, TJ = 25°C, unless otherwise noted.
Parameter
Symbol
SAS/OV
Rising threshold
Hysteresis
Input over-voltage deglitch
time
Fault
Fault output logic low voltage
Fault output high leakage
current
VSAS/OV_RISING
VSAS/OV _HYS
Min
Typ
Max
Units
Output disabled
1.2
1.25
40
1.3
V
mV
tIN_SAS/OV
5
VFAULT_L
Sink 1mA
IFAULT_OFF
V_ Fault = 5.5V
TFAULT_DEG_OC
Fault deglitch time
TFAULT_DEG_OV_OUTPUT(5)
Output Discharge
Discharge resistance
OTP
Thermal shutdown(5)
Thermal hysteresis(5)
Condition
RDIS
TSD
TSD-HYS
Delay time for assertion
or deassertion due to
OCP fault condition
Delay time for assertion
or deassertion due to
output
OVP
fault
condition
VCC = 5V
5
10
µs
200
mV
1
µA
ms
µs
130
Ω
175
50
°C
°C
NOTES:
5) Guaranteed by characterization test.
6) Guaranteed by design.
MP5017 Rev.1.0
10/15/2015
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MP5017 – 3V-5.5V, 1A-5A PROGRAMMABLE CURRENT LIMIT SWITCH
TYPICAL PERFORMANCE CHARACTERISTICS
Performance waveforms are tested on the evaluation board of the Design Example section.
VIN = 5V, VEN = 5V, RLIMIT = 499Ω , SAS/OV float, COUT = 10μF, TA = 25°C, unless otherwise noted.
6
5
4
2.8
240
2.7
220
2.6
200
2.5
180
2.4
3
160
2.3
2
140
2.2
1
0
120
2.1
0
500
1000
1500
12
2
3
3.5
4
4.5
5
5.5
70
55
0
40
3.5
MP5017 Rev.1.0
10/15/2015
4
4.5
5
5.5
30
5.5
20
35
3
5
40
45
2
4.5
60
50
4
4
80
60
6
3.5
100
65
8
3
120
75
10
100
3
3.5
4
4.5
5
5.5
0
0
0.5
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1
1.5
2
6
MP5017 – 3V-5.5V, 1A-5A PROGRAMMABLE CURRENT LIMIT SWITCH
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Performance waveforms are tested on the evaluation board of the Design Example section.
VIN = 5V, VEN = 5V, RLIMIT = 499Ω, SAS/OV float, COUT = 10μF, TA = 25°C, unless otherwise noted.(7)
MP5017 Rev.1.0
10/15/2015
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MP5017 – 3V-5.5V, 1A-5A PROGRAMMABLE CURRENT LIMIT SWITCH
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Performance waveforms are tested on the evaluation board of the Design Example section.
VIN = 5V, VEN = 5V, RLIMIT = 499Ω, SAS/OV float, COUT = 10μF, TA = 25°C, unless otherwise noted.(7)
VOUT
2V/div.
VOUT
2V/div.
VOUT
2V/div.
VEN
5V/div.
SAS
5V/div.
SAS
5V/div.
Fault
5V/div.
IOUT
1A/div.
Fault
5V/div.
IOUT
2A/div.
Fault
5V/div.
IOUT
1A/div.
VOUT
2V/div.
VOUT
2V/div.
VOUT
2V/div.
SAS
5V/div.
SAS
5V/div.
SAS
5V/div.
Fault
5V/div.
IOUT
2A/div.
Fault
5V/div.
IOUT
2A/div.
Fault
5V/div.
IOUT
1A/div.
VOUT
2V/div.
VOUT
2V/div.
VOUT
2V/div.
VIN
5V/div.
Fault
5V/div.
VIN
5V/div.
Fault
5V/div.
VIN
5V/div.
Fault
5V/div.
IOUT
2A/div.
IOUT
2A/div.
IOUT
2A/div.
MP5017 Rev.1.0
10/15/2015
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MP5017 – 3V-5.5V, 1A-5A PROGRAMMABLE CURRENT LIMIT SWITCH
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Performance waveforms are tested on the evaluation board of the Design Example section.
VIN = 5V, VEN = 5V, RLIMIT = 499Ω, SAS/OV float, COUT = 10μF, TA = 25°C, unless otherwise noted.(7)
NOTE:
7) Fault is connected to an external 5V source through a 100k pull-up resistor.
MP5017 Rev.1.0
10/15/2015
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MP5017 – 3V-5.5V, 1A-5A PROGRAMMABLE CURRENT LIMIT SWITCH
PIN FUNCTIONS
Pin #
Name
1, 2, 3
VCC
4
SAS/OV
5
EN
6
Fault
7
DV/DT
8
ILIMIT
9, 10, 11
VOUT
Output voltage. VOUT is controlled by the IC.
12,
Exposed
Pad
GND
System ground.
MP5017 Rev.1.0
10/15/2015
Description
Supply voltage. The MP5017 operates on a 3V to 5.5V continuous input voltage
range with up to 16V of maximum transient input voltage. Decouple the input rail
with a 4.7μF ceramic capacitor. Connect using a wide PCB trace.
SAS disable. Pull SAS/OV low to enable the part; pull SAS/OV high to disable the
part. SAS/OV has an internal 1MΩ pull-down resistor to ground, so it can start up
automatically when SAS/OV is floating. Connect SAS/OV to the tap of an external
resistor divider from input to GND to set the input over voltage.
Enable. EN is a digital input that turns the regulator on or off. Float EN or drive EN
high to turn on the regulator; drive EN low to turn off the regulator.
Open drain output. If OCP, OTP, or output OVP occurs, Fault is pulled low.
Slew rate. The internal DV/DT circuit controls the slew rate of the output voltage at
turn on. An external capacitor from DV/DT to ground is needed to set the soft-start
time.
Current limit set. Place a resistor between ILIMIT and ground to set the value of
the current limit.
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MP5017 – 3V-5.5V, 1A-5A PROGRAMMABLE CURRENT LIMIT SWITCH
FUNCTIONAL BLOCK DIAGRAM
VCC
Charge
Pump
LDO
Current
Sense
Fast Off Comp
X10
VOUT
Reverse
Comp
ILIMIT
1V
Current Limit Amp
Ref
Soft Start
UVLO
VCC VOUT
Control Logic
OVP
5V
1.23V
6.5µA
EN
DV/DT
VCC
4uA
8µA
Thermal
Sense
SAS/OV
1MΩ
80KΩ
FAULT
FLT
GND
Figure 1: Functional Block Diagram
MP5017 Rev.1.0
10/15/2015
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MP5017 – 3V-5.5V, 1A-5A PROGRAMMABLE CURRENT LIMIT SWITCH
OPERATION
The MP5017 is designed to limit the inrush
current to the load when a circuit card is
inserted into a live backplane power source.
This limits the backplane’s voltage drop, as well
as the DV/DT of the voltage to the load. It offers
an integrated solution that monitors the input
voltage, output voltage, output current, and die
temperature, eliminating the need for an
external current sense power resistor, power
MOSFET, and thermal sense device.
Under-Voltage Lockout (UVLO)
The nominal input supply voltage is 5V, but high
energy transients can occur during normal
operation or hot swaps. These transients
depend on the parasitic inductance, resistance
of the wire, and the capacitor at VCC. If the
power clamp (TVS, Tranzorb) is not used, the
E-Fuse must be able to withstand this transient
voltage. The MP5017 uses a high-voltage
MOSFET of up to 16V and a high-voltage circuit
on VCC to guarantee safe operation.
SAS/OV Control
SAS/OV can control the part during start-up and
shutdown. Floating or pulling SAS/OV low
enables the part; pulling it high disables the part.
It also can be used as an input OVP control.
The input OVP limit can be set by a divider from
VCC to SAS/OV (see Figure 2). When the
SAS/OV voltage exceeds 1.25V, the part shuts
down. When the voltage drops below 1.21V or
SAS/OV is floated, the part is enabled again.
Soft Start (SS)
The rise time is a function of the capacitor
(CDV/DT). The approximate value can be
calculated with Equation (1):
tDV / DT (ms) =
1V × CSS ( nF )
6.5μA
(1)
Where tDV/DT is the soft-start time.
For example, a 47nF capacitor generates a
soft-start time of approximately 7.2ms.
Fast Output Over-Voltage Protection (OVP)
The MP5017 uses an output OVP function to
protect the downstream loading when there is a
voltage surge at the input. An accurate and fast
comparator monitors the over-voltage condition
on the output. If the output voltage rises above
the threshold (typically 5.8V), the gate of the
internal MOSFET is pulled down quickly and is
regulated to a specific value to keep the output
voltage clamped at 5.8V. The rapid loop
response speed (typically 10µs) keeps the overvoltage overshoot small.
Current Limit
The MP5017 provides a constant current limit,
which can be programmed by an external
resistor. Once the current limit threshold is
reached, the internal circuit regulates the gate
voltage to hold the current in the power FET. To
limit the current, the gate-to-source voltage
needs to be regulated from 5V to around 1V.
The typical response time is about 10µs. During
this period, the output current may have a small
overshoot.
The desired current limit is a function of the
external current limit resistor.
Figure 2: Adjustable Input OVP
MP5017 Rev.1.0
10/15/2015
Reverse Current Blocking
The MP5017 uses a pair of back-to-back Nchannel MOSFETs for reverse current
protection. Once the reverse current limit
threshold (-50mA) is reached and exceeds the
80µs deglitch time, the internal circuit pulls the
gate voltage down to shut down the MOSFETs.
If the reverse current reaches the -1A threshold,
the part shuts the MOSFETs down immediately
to prevent VOUT from being pulled down.
Fault does not change its state during the
reverse current limit. The reverse current is
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MP5017 – 3V-5.5V, 1A-5A PROGRAMMABLE CURRENT LIMIT SWITCH
blocked, and this state continues until VCC >
VOUT-2mV. When VCC > VOUT-2mV, the part
restarts. If the input voltage drops below the
UVLO threshold, the back-to-back MOSFETs
are turned off, eliminating any reverse current.
Fault
Fault is an open-drain configuration. If any over
current is detected, Fault reports a fail mode
(low level) after a 5ms deglitch timeout. There is
a 10µs deglitch timeout when the output over
voltage is triggered. This ensures that no false
fault signals are reported. The internal deglitch
circuit eliminates the need for external
components. Fault does not deglitch during an
over-temperature condition (see Table 1).
Table 1: Fault Function Truth Table
Description
Under-voltage lockout
EN low
SAS/OV high
VOUT OVP clamp
Thermal shutdown
Current limit
Fast current limit
Reverse current protection
SAS/OV floating
SAS/OV low
Fault
E-Fuse State
Latch
Output Discharge
High
High
High
Low
(10μs deglitch time)
Low
Low
(5ms deglitch time)
Low
High
High
High
Off
Off
Off
No
No
No
No
Yes
Yes
High Z
No
No
Off
No
No
High Z
No
No
Off
Off
On
On
No
No
No
No
No
No
No
No
Short-Circuit Protection
If the load current increases too rapidly due to a
short-circuit event, the current may exceed the
current limit threshold before the control loop is
able to respond. If the current reaches 7.5A, a
secondary current limit level from a fast turn-off
circuit is activated. The power FET turns off
with a 100mA pull-down gate discharge current.
This helps limit the peak current through the
switch, keeping the input voltage from dropping
excessively. After the FET is switched off, the
part restarts. If the short remains during the
restart process, the MP5017 regulates the gate
voltage to hold the current at a normal current
limit level.
Output Discharge
The MP5017 uses a discharge function to
provide a resistive discharge path for the
external output capacitor. The function is active
EN Control
EN enables the part when it is high and
disables the part when it is low. Floating EN
automatically starts the part up because an
internal current source pulls EN up to the
internal supply. The maximum internal pull-up
voltage source is about 5V.
Thermal Shutdown (OTP Auto-Retry)
Thermal shutdown prevents the chip from
operating at exceedingly high temperatures.
When the silicon die reaches temperatures that
exceed 175°C, the entire chip shuts down and
Fault reports a fail mode. When the
temperature drops below its lower threshold,
typically 125°C, the chip is enable again after a
76ms delay.
when the part is disabled (EN low or SAS high).
and is done in a very limited amount of time.
MP5017 Rev.1.0
10/15/2015
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MP5017 – 3V-5.5V, 1A-5A PROGRAMMABLE CURRENT LIMIT SWITCH
APPLICATION INFORMATION
Setting the Current Limit
The MP5017 current limit value should exceed
the normal maximum load current to account for
the variations in the current sense value. The
current limit is a function of the external currentlimit resistor. The value can be approximated
with Equation (2):
1.16V × 10 3
I LIMIT (A) =
R LIMIT (Ω)
(2)
Table 2 and Figure 3 below list examples of
current limit values as a function of the resistor
value.
Table 2: Current Limit vs. Current Limit Resistor
Current Limit
Resistor (Ω)
Current Limit (A)
1400
806
499
324
226
0.9
1.51
2.40
3.61
5.04
PCB Layout Guidelines
Efficient PCB layout is critical for stable
operation. For best results, refer to Figure 4 and
follow the guidelines below.
1. Place the high-current paths (VCC and
VOUT) close to the device using short,
direct, and wide traces.
2. Place the input capacitor (C1) as close to
VCC and GND as possible.
3. Connect the VCC and VOUT pads to large
copper
traces
for
better
thermal
performance.
4. Place RLIMIT (R1) close to ILIMIT.
5. Place DV/DT capacitor (C3) close to DV/DT.
VOUT
GND
C3
VCC
R1
GND
Top Layer
Fault
Figure 3: Current Limit vs. Current Limit Resistor
Bottom Layer
Figure 4: Recommended Layout
MP5017 Rev.1.0
10/15/2015
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MP5017 – 3V-5.5V, 1A-5A PROGRAMMABLE CURRENT LIMIT SWITCH
Design Example
Below is a design example following the
application
guidelines
for
the
given
specifications:
Table 3: Design Example
5V
VIN
2.4A
Current limit
7.2ms
SS time
The detailed application schematic is shown in
Figure 5. The typical performance and circuit
waveforms are shown in the Typical
Performance Characteristics section. For more
detailed device applications, please refer to the
related evaluation board datasheets.
MP5017 Rev.1.0
10/15/2015
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MP5017 – 3V-5.5V, 1A-5A PROGRAMMABLE CURRENT LIMIT SWITCH
TYPICAL APPLICATION CIRCUITS
VIN
C1
4.7μF
1, 2, 3
Power down/
DEVSLP
ENABLE
4
11
5
10
6
9
7
8
Fault
C3
47nF
VOUT
12,pad
C2
10μF
R1
499Ω
Figure 5: 5V VIN Application
MP5017 Rev.1.0
10/15/2015
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MP5017 – 3V-5.5V, 1A-5A PROGRAMMABLE CURRENT LIMIT SWITCH
PACKAGE INFORMATION
QFN-12 (2mmx3mm)
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) EXPOSED PADDLE SIZE DOES NOT INCLUDE
MOLD FLASH.
3) LEAD COPLANARITY SHALL BE 0.10
MILLIMETERS MAX.
4) JEDEC REFERENCE IS MO-220.
5) DRAWING IS NOT TO SCALE.
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.
MP5017 Rev.1.0
10/15/2015
www.MonolithicPower.com
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