MP9115DQT [MPS]
Switching Regulator, Current-mode, 6A, 1400kHz Switching Freq-Max, TQFN-10;
| 型号： | MP9115DQT |
| 厂家： | 
MONOLITHIC POWER SYSTEMS |
| 描述： | Switching Regulator, Current-mode, 6A, 1400kHz Switching Freq-Max, TQFN-10 开关 |
| 文件： | 总11页 (文件大小：294K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MP9115
2.7-6V Input, 2.5A,1.2MHz
Synchronous Step-Down Converter
The Future of Analog IC Technology
DESCRIPTION
FEATURES
•
•
•
Output Adjustable from 0.8V to VIN
Up to 91% Efficiency
100% Duty Cycle for Low Dropout
Applications
The MP9115 is a fully integrated, internally
compensated 1.2MHz fixed frequency PWM
step-down converter. It is ideal for powering
portable equipment that runs from a single cell
Lithium-Ion (Li+) Battery, with an input range
from 2.7V to 6V. The MP9115 can provide up to
2.5A of load current with output voltage as low
as 0.8V. It can also operate at 100% duty cycle
for low dropout applications.
•
•
•
•
•
1μA Shutdown Current
1.2MHz Fixed Switching Frequency
2.7V-6V Input Operation Range
3A Peak Output Current
Stable with Low ESR Output Ceramic
Capacitors
Thermal Shutdown
Cycle-by-Cycle Over Current Protection
Short circuit protection
With peak current mode control and internal
compensation, the MP9115 is stable with
ceramic capacitors and small inductors. Fault
condition protection includes cycle-by-cycle
current limiting and thermal shutdown.
•
•
•
•
No reverse current of LS MOS for Pre-bias
start up
Available in 10-pin 3x3mm TQFN
MP9115 is available in the small 10-pin
3mmx3mm TQFN package.
•
APPLICATIONS
•
•
•
•
•
Smart Phones
PDA’s
DVD+/-RW Drives
Digital Cameras
Portable Instruments
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
Efficiency
1
2
3
4
5
10
N/C
FB
SHDN
V
=1.2V
OUT
SHDN
GND
LX
100
90
80
70
60
50
40
30
20
10
0
9
8
V
=3V
IN
MP9115
VIN
L1
1.2
7
6
N/C
PVIN
LX
2.2uH
V
=5V
IN
Cf
22pF
N/C
C2
22
C1
R2
0.01
0.1
1
10
LOAD CURRENT (A)
MP9115 Rev. 0.92
1/14/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
1
MP9115 – 2.7-6V, 2.5A, 1.2MHZ SYNCHRONOUS STEP-DOWN CONVERTER
ORDERING INFORMATION
Part Number*
Package
Top Marking
Free Air Temperature (TA)
MP9115DQT
TQFN10 (3mm x 3mm)
2N
-40°C to +85°C
*For Tape & Reel, add suffix –Z (eg. MP9115DQT–Z);
For RoHS compliant packaging, add suffix –LF (eg. MP9115DQT–LF–Z)
PACKAGE REFERENCE
TOP VIEW
SHDN
GND
LX
1
2
3
4
5
10 N/C
9
8
7
6
FB
VIN
N/C
PVIN
LX
N/C
ABSOLUTE MAXIMUM RATINGS (1)
PVIN, VIN to GND.......................-0.3V to + 6.5V
SW to GND ...........................-0.3V to VIN + 0.3V
EN, FB to GND ............................-0.3V to +6.5V
Operating Temperature.............. -40°C to +85°C
Continuous Power Dissipation (TA = +25°C) (2)
............................................................. 2.5W
Junction Temperature...............................150°C
Lead Temperature ....................................260°C
Storage Temperature…………-65°C to +150°C
Thermal Resistance (4)
TQFN10 (3x3mm) ...................50 ...... 12...°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.
Recommended Operating Conditions (3)
Supply Voltage VIN .............................2.7V to 6V
Operating Junct. Temp (TJ)...... -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.
MP9115 Rev. 0.92
1/14/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
2
MP9115 – 2.7-6V, 2.5A, 1.2MHZ SYNCHRONOUS STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS (5)
VIN = PVIN =3.6V, VSHDN = GND, TA = +25°C, unless otherwise noted.
Parameters
Symbol
Condition
Min
Typ
600
0.01
Max
900
1
Units
μA
Supply Current
Shutdown Current
IIN
VSHDN = 0V, VFB = 0.9V
VSHDN = VIN, VIN = 6V
ISHUT
μA
Thermal
Threshold
SHDN Trip Threshold
SHDN Input Current
Shutdown
Trip
TSD
Hysteresis = 20°C
150
1.0
°C
SHDNVTH
ISHDN
-40°C ≤ TA ≤ +85°C
VSHDN = 0V to 6.5V
0.3
-5
1.5
5
V
μA
IN
Undervoltage
Lockout
Lockout
INUVVTH
INUVHYS
VFB
Rising Edge
2.15
2.40
160
2.65
V
mV
V
Threshold
IN
Hysteresis
Undervoltage
TA = +25°C
-40°C≤ TA≤ +85°C
VFB = 0.9V
ILx = 100mA
ILx = -100mA
0.784
0.776
-50
0.800
0.800
-2
0.25
0.20
0.816
0.824
+50
Regulated FB Voltage
FB Input Bias Current
PFET On Resistance
NFET On Resistance
IFB
HSRDS-ON
LSRDS-ON
nA
Ω
Ω
V
V
SHDN=3.6V;
Lx_=0V
VIN=6V;
LXHSLKG
LXLSLKG
-1
-5
1
5
μA
μA
LX Leakage Current
VSHDN =3.6V; VIN=6V;
Lx_=6V
Duty Cycle=100%,
V
PFET Peak Current Limit
Switching Frequency
Notes:
ILIMIT
FSW
3.5
1.0
4.5
1.2
6
1.4
A
MHz
5) Production test at +25°C. Specifications over the temperature range are guaranteed by design and characterization.
MP9115 Rev. 0.92
1/14/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
3
MP9115 – 2.7-6V, 2.5A, 1.2MHZ SYNCHRONOUS STEP-DOWN CONVERTER
PIN FUNCTIONS
Pin #
Name
SHDN
GND
LX
Description
1
2
Shut down input, “High” disables MP9115.
Ground pin
3,4
5
Switching node to the inductor
No connection
N/C
6
PVIN
N/C
Input supply pin for power FET
No connection
7
8
VIN
Input Supply pin for controller
Feedback input pin
9
FB
10
N/C
No connection
MP9115 Rev. 0.92
1/14/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
4
MP9115 – 2.7-6V, 2.5A, 1.2MHZ SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 5V, VOUT = 1.2V, L=2.2uH, TA = +25ºC, unless otherwise noted.
Efficiency vs. Load Current Efficiency vs. Load Current
Supply Current vs.
Input Voltage
V
=1.2V
V
=2.5V
OUT
OUT
100
90
80
70
60
50
40
30
20
590
570
550
530
510
490
470
450
100
90
80
70
60
50
40
30
20
10
0
V
=3V
IN
V
=4.5V
IN
V
=5V
IN
V
=5V
IN
V
=5.5V
IN
0.01
0.1
1
10
2
3
4
5
6
7
0.01
0.1
1
10
INPUT VOLTAGE (V)
LOAD CURRENT (A)
LOAD CURRENT (A)
Case Temperature Rise vs.
Output Current
Line Regulation
Load Regulation
0.006
0.004
0.002
0.000
-0.002
-0.004
-0.006
60
50
40
30
20
10
0
0.004
0.002
0.000
-0.002
-0.004
I
=0A
O
V
=5V
IN
V
=3V
IN
I
=1.25A
O
I
=2.5A
O
0
0.5
1
1.5
2
2.5
0
0.5
1
1.5
2
2.5
2.5
3.5
4.5
5.5
6.5
LOAD CURRENT (A)
INPUT VOLTAGE (V)
OUTPUT CURRENT (A)
Ipeak vs. Duty
4.75
4.5
4.25
4
3.75
3.5
50 60
70
80
90 100
DUTY CYCLE (%)
MP9115 Rev. 0.92
1/14/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
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MP9115 – 2.7-6V, 2.5A, 1.2MHZ SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 5V, VOUT = 1.2V, L=2.2uH, TA = +25ºC, unless otherwise noted.
Short Entry
Full Load
Short Recovery
Full Load
Power up without Load
V
OUT
1V/div.
V
V
OUT
OUT
500mV/div.
500mV/div.
V
IN
V
2V/div.
_Lx
5V/div.
V
V
_Lx
_Lx
2V/div.
5V/div.
I
I
I
_inductor
_inductor
2A/div.
_inductor
5A/div.
500mA/div.
10us/div.
40us/div.
100us/div.
Power up with 2.5A Load
SHDN Start up without Load
SHDN Start Up with 2.5A Load
V
V
OUT
1V/div.
V
OUT
OUT
1V/div.
1V/div.
V
IN
V
V
_SHDN
_SHDN
5V/div.
2V/div.
2V/div.
V
V
_Lx
V
_Lx
_Lx
5V/div.
5V/div.
2V/div.
I
I
I
_inductor
2A/div.
_inductor
2A/div.
_inductor
500mA/div.
100us/div.
100us/div.
100us/div.
Input Ripple Voltage
Full Load
Output Ripple Voltage
Full Load
Load Transient Response
(1.25A-2.5A, Slew Rate:2.5A/uS)
V
OUT
20mV/div.
V
V
OUT
IN
50mV/div.
50mV/div.
V
IN
5V/div.
V
_Lx
V
_Lx
2V/div.
2V/div.
I
OUT
1A/div.
I
_inductor
2A/div.
400ns/div.
400ns/div.
100us/div.
MP9115 Rev. 0.92
1/14/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
6
MP9115 – 2.7-6V, 2.5A, 1.2MHZ SYNCHRONOUS STEP-DOWN CONVERTER
FUNCTIONAL BLOCK DIAGRAM
PVIN
VIN
To controller
blocks
Bias
&
Voltage
+
-
IAMP
10X
SHDN
0.04
Reference
Current
Sense Amp
Main
Switch
(PCH)
0.8 V
ICS
Feedback
Error Amp
+
+
-
Slope Comp
EAO
PWM
PWMCMP
+
RI
EAMP
FB
-
PWM
Control
Logic
48k
LX
RZ
CC
17pF
Synchronou s
Rectifier
(NCH)
1. 1M
OSC
1.2MHz
Oscillator
GND
Figure 1—Functional Block Diagram
MP9115 Rev. 0.92
1/14/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
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MP9115 – 2.7-6V, 2.5A, 1.2MHZ SYNCHRONOUS STEP-DOWN CONVERTER
OPERATION
The MP9115 is a fixed frequency 1.2MHz current
mode 2.5A step-down converter, optimized for
low voltage, Li-Ion battery powered applications
where high efficiency and small size are critical.
MP9115 integrates a high side PFET main switch
and a low side synchronous rectifier. It always
operates in continuous conduction mode,
simplifies the control scheme and eliminates the
random spectrum noise due to discontinuous
conduction mode.
Dropout Operation
The MP9115 allows the main switch to remain on
for more than one switching cycle to increase the
duty cycle when the input voltage is dropping
close to the output voltage. When the duty cycle
reaches 100%, the main switch is held on
continuously to deliver current to the output up to
the PFET current limit. In this case, the output
voltage becomes the input voltage minus the
voltage drop across the main switch and the
inductor.
The steady state duty cycle D for this mode can
be calculated as:
Maximum Load Current
VOUT
The MP9115 can operate down to 2.7V input
voltage; however the maximum load current
decreases at lower input due to a large IR drop
on the main switch and synchronous rectifier.
The slope compensation signal reduces the peak
inductor current as a function of the duty cycle to
prevent sub-harmonic oscillations at duty cycles
greater than 50%. Conversely, the current limit
increases as the duty cycle decreases.
D = TON × fOSC ×100% ≈
×100%
VIN
Where TON is the main switch on time and fOSC is
the oscillator frequency (1.2MHz typ.).
Current Mode PWM Control
Slope compensated current mode PWM control
provides stable switching and cycle-by-cycle
current limiting for superior load and line
response as well as protection of the internal
main switch and synchronous rectifier. The
MP9115 switches at a constant frequency
(1.2MHz) and modulates the inductor peak
current to regulate the output voltage. Specifically,
for each cycle the PWM controller forces the
inductor peak current to an internal reference
level derived from the feedback error voltage. At
normal operation, the main switch is turned on at
each rise edge of the internal oscillator, and
remains on for a certain period of time to ramp up
the inductor current. As soon as the inductor
current reaches the reference level, the main
switch is turned off and immediately the
synchronous rectifier will be turned on to provide
the inductor current. In forced PWM mode, the
synchronous rectifier will stay on until the next
oscillator cycle.
Short Circuit Protection
When the output is shorted to ground, the
oscillator frequency is reduced to prevent the
inductor current from increasing beyond the
PFET current limit. The PFET current limit is also
reduced to lower the short circuit current. The
frequency and current limit will return to the
normal values once the short circuit condition is
removed and the feedback voltage approaches
0.8V.
MP9115 Rev. 0.92
1/14/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
8
MP9115 – 2.7-6V, 2.5A, 1.2MHZ SYNCHRONOUS STEP-DOWN CONVERTER
APPLICATION INFORMATION
Output Voltage Setting
Table 2—Suggested Inductors
The output voltage is set by the external resistor
divider:
Dimensions
Manufactu
rer
Inductance
Part Number
LxWxH
(μH)
(mm3)
R1
VOUT = 0.8⋅(1+
)
Wurth
TDK
7447745022
SLF6045T-
2R2N3R3-3PF
2.2
2.2
5.8X5.2X2
6X6X4.5
R2
The feedforward capacitor is recommended when
output voltage is low, as Figure 2 shows.
Input Capacitor CIN Selection
The input capacitor reduces the surge current
drawn from the input and switching noise from
the device.
Ceramic capacitors with X5R or X7R dielectrics
are highly recommended because of their low
ESR and small temperature coefficients. For
most applications, a 10μF capacitor is sufficient.
Figure 2—Feedback Network
Table 1 lists the recommended resistors and
feedforward capacitors value for common output
voltages.
Output Capacitor COUT Selection
The output capacitor keeps output voltage ripple
small and ensures regulation loop stable. The
output capacitor impedance shall be low at the
switching frequency. Ceramic capacitors with
X5R or X7R dielectrics are recommended. For
forced PWM mode operation, the output ripple
ΔVOUT is approximately:
Table 1—Resistor and Feedforward Capacitor
Selection for Common Output Voltages
Vout
(V)
R1
(kꢀ)
R2
(kꢀ)
Cf
(pF)
C2 (uF)
Ceramic
L1
(uH)
1.2
1.5
1.8
2.5
3.3
120
120
120
120
120
240
137
22
18
44
44
44
44
44
2.2
2.2
2.2
2.2
2.2
VOUT ⋅(V − VOUT
)
1
1
95.3
56.2
38.3
18
IN
ΔVOUT
=
(RESR
+
⋅
)
V ⋅ fOSC ⋅L
8 fOSC ⋅COUT
IN
NS
NS
For most applications, a 33μF capacitor is
sufficient.
Inductor Selection
Thermal Dissipation
A 1μH to 10μH inductor with DC current rating at
least 25% higher than the maximum load current
is recommended for most applications. For best
efficiency, the inductor DC resistance shall be
<200mꢀ. See Table2 for recommended
inductors and manufacturers. For most designs,
the inductance value can be derived from the
following equation:
Power dissipation shall be considered when
operates MP9115 at maximum 2.5A output
current. If the junction temperature rises above
150°C, MP9115 will be shut down by internal
thermal protection circuitry.
The junction-to-ambient thermal resistance of the
10-pin TQFN (3mm x 3mm) RΘJA is 50°C/W. The
maximum allowable power dissipation is
about1.6W when MP9115 is operating in a 70°C
ambient temperature environment:
VOUT
×
(
V
− VOUT
)
IN
L =
V × ΔIL × fOSC
IN
Where ΔIL is inductor ripple current. Choose
inductor ripple current approximately 30% of the
maximum load current, 2.5A.
150o C − 70o C
PDMAX
=
= 1.6W
50o C / W
The maximum inductor peak current is:
ΔIL
2
IL(MAX) = ILOAD
+
MP9115 Rev. 0.92
1/14/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
9
MP9115 – 2.7-6V, 2.5A, 1.2MHZ SYNCHRONOUS STEP-DOWN CONVERTER
should be placed as close as possible to the
respective PVIN and GND pins. The external
feedback resistors shall be placed next to the FB
pins. Keep the switching nodes Lx short and
PC Board Layout
The high current paths (GND, PVIN and Lx)
should be placed very close to the device with
short, direct and wide traces. Input capacitors
away
from
the
feedback
network.
GND
Top Layer
Bottom Layer
Figure 3— PCB Layout
MP9115 Rev. 0.92
1/14/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
10
MP9115 – 2.7-6V, 2.5A, 1.2MHZ SYNCHRONOUS STEP-DOWN CONVERTER
PACKAGE INFORMATION
TQFN10 (3mmx3mm)
2.90
3.10
0.30
0.50
1.45
1.75
PIN 1 ID
SEE DETAIL A
PIN 1 ID
MARKING
0.18
10
1
5
0.30
2.25
2.55
2.90
3.10
PIN 1 ID
INDEX AREA
0.50
BSC
6
TOP VIEW
BOTTOM VIEW
PIN 1 ID OPTION A
R0.20 TYP.
PIN 1 ID OPTION B
R0.20 TYP.
0.70
0.80
0.20 REF
0.00
0.05
SIDE VIEW
DETAIL A
NOTE:
2.90
1.70
1) ALL DIMENSIONS ARE IN MILLIMETERS.
0.70
0.25
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.
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.
MP9115 Rev. 0.92
1/14/2010
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
11
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