MP5077GG [MPS]
5.5V, 7A, Low RDSON Load Switch With Programmable Current Limit;
| 型号： | MP5077GG |
| 厂家： | 
MONOLITHIC POWER SYSTEMS |
| 描述： | 5.5V, 7A, Low RDSON Load Switch With Programmable Current Limit |
| 文件： | 总14页 (文件大小：441K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MP5077
5.5V, 7A, Low RDSON Load Switch
With Programmable Current Limit
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP5077 provides up to 7A load protection
over a 0.5V to 5.5V voltage range. With the
small RDSON in tiny package, MP5077 is a very
high efficiency and space saving solution for
notebooks, tablets, and other portable/battery-
operated applications.
•
•
•
•
•
•
•
•
Integrated 10mꢀ Low RDSON FETs
Adjustable Start Up Slew Rate
Wide VIN Range from 0.5V to 5.5V
<1μA Shutdown Current
Programmable 7A Current Limit Range
Output Discharge Function
Enable Pin
With the soft start function, the MP5077 can
avoid inrush current during circuit start up.
MP5077 also provides programmable soft start
time, output discharge functions, OCP and
thermal shutdown features.
<200ns Short-Circuit Protection Response
Time
•
•
Thermal Protection
Small 2mmx2mm QFN Package for
Space Saving
The maximum load at the output (source) is
current limited. This is accomplished by utilizing
a sense FET topology. The magnitude of the
current limit is controlled by an external resistor
from the ILIM pin to ground.
APPLICATIONS
•
•
•
•
Notebook and Tablet Computers
Portable Devices
Solid State Drives
Handheld Devices
An internal charge pump drives the gate of the
power device, allowing a very low on-resistance
DMOS power FET of just 10mΩ.
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
The MP5077 is available in a tiny 12-pin
2mmx2mm QFN package.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
0.5V to 5.5V
VIN
0.5V to 5.5V
VOUT
C1
C2
MP5077
>3V
VCC
EN
ILIM
SS
C3
EN
R1
C4
GND
MP5077 Rev. 1.01
6/23/2014
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
1
MP5077 – 5.5V, 7A, LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT
ORDERING INFORMATION
Part Number*
Package
Top Marking
MP5077GG
QFN-12 (2mmx2mm)
See Blow
* For Tape & Reel, add suffix –Z (e.g. MP5077GG–Z);
TOP MARKING
CC: product code of MP5077GG;
Y: year code;
LLL: lot number;
PACKAGE REFERENCE
TOP VIEW
NC VIN
EN
VOUT
VOUT
GND
VCC
ILIM
VOUT
VOUT
SS VIN
QFN-12 (2mmx2mm)
MP5077 Rev. 1.01
6/23/2014
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
2
MP5077 – 5.5V, 7A, LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT
ABSOLUTE MAXIMUM RATINGS (1)
VIN.............................................. –0.3V to +6.5V
VCC............................................. –0.3V to +6.5V
VOUT ........................................... –0.3V to +6.5V
EN, SS, ILIM........................–0.3V to Vcc+0.3 V
Junction Temperature..............................150°C
Lead Temperature ...................................260°C
Thermal Resistance (4)
QFN-12 (2mmx2mm) ……....…80 16 °C/W
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-to-
ambient 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 will cause excessive die temperature, and the
regulator will go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
(2)
Continuous Power Dissipation
QFN-12 (2mmx2mm).................................1.6W
Recommended Operating Conditions (3)
Supply Voltage VIN ......................... 0.5V to 5.5V
Supply Voltage Vcc ............................ 3V to 5.5V
Output Voltage VOUT....................... 0.5V to 5.5V
Operating Junction Temp.........-40°C to +125°C
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7, 4-layer PCB.
MP5077 Rev. 1.01
6/23/2014
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
3
MP5077 – 5.5V, 7A, LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT
ELECTRICAL CHARACTERISTICS
VIN = 3.6V, VCC = 3.6V, TA = 25°C, unless otherwise noted.
Parameters
Symbol Condition
Min
Typ
Max
Units
Input and Supply Voltage Range
Input Voltage
Supply Voltage
VIN
VCC
0.5
3
5.5
5.5
V
V
Supply Current
Off State Leakage Current
IOFF
VIN=5V, EN=0
1
µA
µA
VCC=5V, EN=0
VCC=5V, Enable, No load
0.1
220
1
330
VCC Standby Current
Power FET
ISTBY
VCC=5.0V
VCC=3.3V
10
12
ON Resistance
RDSON
mꢀ
Thermal Shutdown and Recovery
Shutdown Temperature(5)
Hysteresis(5)
TSTD
THYS
155
30
°C
°C
Under Voltage Protection
VCC Under Voltage Lockout
Threshold
VCC_UVLO UVLO Rising Threshold
VUVLOHYS
2.6
2.8
V
UVLO Hysteresis
200
mV
Soft Start
SS pull-up current
Enable
ISS
9
µA
EN Rising Threshold
EN Hysteresis
Current Limit
VENH
VEN HYS
1.3
1.5
400
1.7
V
mV
RLIMIT=50kꢀ, ramp lout
IOUT
Current limit
1.54
1.64
200
1.74
A
record peak current limit
Discharge Resistance
Discharge Resistance
Notes:
RDIS
ꢀ
5) Guarantee by Characterization-Not Production tested.
MP5077 Rev. 1.01
www.MonolithicPower.com
4
6/23/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
MP5077 – 5.5V, 7A, LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT
PIN FUNCTIONS
Pin #
Name Description
1
2
3
EN Enable Input. Pulling this pin below the specified threshold shuts the chip down.
GND Ground.
VCC Supply Voltage to the Control Circuitry.
Output Current Limit Configure. Place a resistor to ground to set the overload current limit
level.
4
ILIM
Soft start pin. An external capacitor connected to this pin sets the slew rate of the output
voltage soft start period.
5
SS
6, 11
VIN Input Power Supply.
7, 8, 9, 10 VOUT Output to the load.
12
NC Factory Test Pin. Keep it floating.
MP5077 Rev. 1.01
6/23/2014
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
5
MP5077 – 5.5V, 7A, LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.6V, VCC = 3.6V, EN=2.5V, RLIM = 10.5k, TA = 25°C, unless otherwise noted.
MP5077 Rev. 1.01
6/23/2014
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
6
MP5077 – 5.5V, 7A, LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 3.6V, VCC = 3.6V, EN=2.5V, RLIM = 10.5k, TA = 25°C, unless otherwise noted.
MP5077 Rev. 1.01
6/23/2014
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
7
MP5077 – 5.5V, 7A, LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 3.6V, VCC = 3.6V, EN=2.5V, RLIM = 10.5k, TA = 25°C, unless otherwise noted.
Enable Startup
Enable Startup
Enable Shutdown
V
=3.6V, VCC=3.6V, No Load
V
=3.6V, VCC=3.6V, 7A Load
V
=3.6V, VCC=3.6V, No Load
IN
IN
IN
V
V
OUT
V
OUT
2V/div.
OUT
2V/div.
2V/div.
V
V
EN
V
EN
EN
5V/div.
5V/div.
5V/div.
ILIM
500mV/div.
ILIM
500mV/div.
ILIM
500mV/div.
I
I
OUT
I
OUT
OUT
5A/div.
5A/div.
5A/div.
Enable Shutdown
Power Up
Power Up
V
=3.6V, VCC=3.6V, 7A Load
V
=3.6V, VCC=3.6V, No Load
V
=3.6V, VCC=3.6V, 7A Load
IN
IN
IN
V
OUT
V
V
OUT
OUT
2V/div.
2V/div.
2V/div.
V
V
V
EN
IN
IN
5V/div.
2V/div.
2V/div.
ILIM
500mV/div.
ILIM
500mV/div.
ILIM
500mV/div.
I
OUT
I
I
OUT
OUT
5A/div.
5A/div.
5A/div.
Power Down
Steady State
Load Transient Response
V
=3.6V, VCC=3.6V, No Load
V
=3.6V, VCC=3.6V, 7A Load
V
=5V, VCC=3.3V, IOUT=0A-7A
IN
IN
IN
V
V
OUT
OUT
2V/div.
V
2V/div.
OUT
2V/div.
V
V
IN
IN
2V/div.
2V/div.
V
IN
5V/div.
ILIM
500mV/div.
ILIM
500mV/div.
I
OUT
5A/div.
I
I
OUT
OUT
5A/div.
5A/div.
MP5077 Rev. 1.01
6/23/2014
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
8
MP5077 – 5.5V, 7A, LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 3.6V, VCC = 3.6V, EN=2.5V, RLIM = 10.5k, TA = 25°C, unless otherwise noted.
MP5077 Rev. 1.01
6/23/2014
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
9
MP5077 – 5.5V, 7A, LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT
ILIM
9uA
Figure 1: Functional Block Diagram
MP5077 Rev. 1.01
6/23/2014
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
10
MP5077 – 5.5V, 7A, LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT
OPERATION
The MP5077 is designed to limit the in-rush
current to the load thereby limiting the
backplane’s voltage drop and the slew rate of
the voltage to the load. It provides an integrated
solution to monitor the input voltage, output
voltage and output current to eliminate the need
for an external current power MOSFET, and
current switch device.
Short-Circuit Protection
If the load current increases rapidly due to a
short circuit, the current may exceed the current
limit threshold by a lot before the control loop
can respond. If the current reaches an internal
secondary current limit level (typical 13A), a fast
turn-off circuit activates to turn off the power
FET. This limits the peak current through the
switch to limit the input voltage drop. The total
short circuit response time is about 200ns. If
fast off works, it will keep off the power FET for
80μs. After that time period, it will re-turn on
power FET. If the part is still in short-circuit
condition. MP5077 will reduce the current limit
to 2/3 of pre-set value, and hold it until the part
is so hot and thermal shutdown. After the short-
circuit condition removed, the current limit will
recover to the pre-set value automatically.
Enable
When input voltage is greater than the under-
voltage lockout threshold (UVLO), typically 0.5V,
MP5077 can be enabled by pulling EN pin to
higher than 1.5V. Pulling down to ground or
floating will disable MP5077.
Current Limit
The MP5077 provides a constant current limit
that can be programmed by an external resistor.
Once the device reaches its current limit
threshold, the internal circuit regulates the gate
voltage to hold the current in the power FET
constant. The typical response time is about
20µs and the output current may have a small
overshoot during this time period.
Output Discharge
MP5077 has output discharge function. This
function can discharge the Vo by internal pull
down resistance when IC EN disabled or VCC
shutdown and the load is very light.
Soft-Start
The pre-set current limit value can be
calculated by below equation:
A capacitor connected to the SS pin determines
the soft-start time. There is an internal 9μA
constant current source charge SS cap and
ramps up the voltage on the SS pin. The output
voltage rises at 3 times the slew rate to SS
voltage.
ILimit = (1÷RLimit )×S
(1)
S is the current sense ratio of MP5077, and this
value is typically 82000 in VIN=3.6V. The other
values of S please refer the curves in typical
performance characteristics.
The soft-start time can be calculated by below
equation:
If the current limit block starts to regulate the
output current, the power loss on power
MOSFET will cause the IC temperature rise. If
the junction temperature rose to high enough, it
will trigger thermal shutdown. After thermal
shutdown happened, it will disable the output
until the over temperature fault remove. The
over temperature threshold is 155oC and
hysteresis is 30oC.
VOUT (V)⋅CSS (nF)
1
TSS (ms) = ×
3
(2)
ISS (uA)
TSS is the soft-start time, ISS is internal 9μA
constant current, CSS is external soft-start cap.
The suggestion minimum SS cap should be
bigger than 4.7nF. If the SS pin is floated or SS
cap is too small, the Vout rising time will be just
limited by power MOS charge time.
MP5077 Rev. 1.01
6/23/2014
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
11
MP5077 – 5.5V, 7A, LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT
APPLICATION INFORMATION
Soft Start @ Different Output Capacitance
ILIM Resistor Selection
The current limit value can be set by ILIM
resistor. The current limit can be gotten by
equation (1).
VOUT
Current Limit
Current Limit
Current Limit
The current limit threshold is suggested to 10%
~ 20% higher than maximum load current. For
example, if the system’s full load is 7A, set the
current limit to 7.7A.
IIN
Soft Start @ Small Capacitance
Soft Start Capacitor Selection
There is an internal 9μA constant current
source charge SS cap and ramps up the
voltage on the SS pin. The output voltage rises
follow 3 times the slew rate of SS voltage.
VOUT
If the inrush on output current reached the
current limit during start up (like with large
output cap or very large load), MP5077 will limit
the output current and the same time, SS time
will be increased (Figure 2 and Figure 3).
IIN
Soft Start @ Large Capacitance
VOUT
Soft Start @ Different Load
VOUT
IIN
Current Limit
Soft Start @ Very large
Capacitance
IIN
Figure 3: Soft Start Periods at different output
capacitance
Soft Start @ No Load
Design Example
Some design example and are provided below.
See Table 1 and Figure 4.
VOUT
Current Limit
Table 1
Vin Max Load Range Rlimit SS cap SS time
(V)
5
5
5
(A)
3
5
7.5
(kΩ)
26.1
15.8
10.5
(nF)
22
47
100
(ms)
4
9
20
IIN
Soft Start @ Half Load
VOUT
Current Limit
IIN
Soft Start @ Very large Load
Figure 2: Soft Start Periods at different load
MP5077 Rev. 1.01
6/23/2014
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
12
MP5077 – 5.5V, 7A, LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT
Figure 4: Typical Application Schematic
Layout Guide
PCB layout is very important to achieve stable
operation. Please follow these guidelines and
take below figure for reference. Place RLIMIT
close to ILIM pin, input cap close to VCC pin. Put
enough vias around IC to achieve better
thermal performance.
Vin
GND
C1
GND
C3
C5
EN
VCC
Vout
GND
ILIM
R1
C4
C6
GND
GND
Vin
C2
Figure 5: Recommended Layout
MP5077 Rev. 1.01
6/23/2014
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
13
MP5077 – 5.5V, 7A, LOW RDSON LOAD SWITCH WITH PROGRAMMABLE CURRENT LIMIT
PACKAGE INFORMATION
QFN12 (2mmx2mm)
NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.
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.
MP5077 Rev. 1.01
6/23/2014
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
14
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