MP3120DJ-LF [MPS]
Switching Regulator, Current-mode, 1155kHz Switching Freq-Max, PDSO6, TSOT-23, 6 PIN;
| 型号： | MP3120DJ-LF |
| 厂家： | 
MONOLITHIC POWER SYSTEMS |
| 描述： | Switching Regulator, Current-mode, 1155kHz Switching Freq-Max, PDSO6, TSOT-23, 6 PIN 开关 光电二极管 |
| 文件： | 总10页 (文件大小：706K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MP3120
1.2A, 1.1MHz Synchronous
Boost Converter with Output Disconnect
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP3120 is a high efficiency synchronous,
current mode step-up converter. The device
can boost a single cell or two cells AA battery
up to 5V.
•
•
•
Up to 96% Efficiency
True Output Disconnect from Input
Inrush Current Limiting and Internal Soft-
Start
The MP3120 can start up from an input voltage
as low as 0.8V and provide in-rush current
limiting as well as output short circuit protection.
The integrated P-Channel synchronous rectified
switch provides improved efficiency and
eliminates the need of an external schottky
diode. The P-MOS will disconnect the output
from the input when EN is low. This output
disconnect feature allows the output to be
completely discharged, thus allowing the part to
draw less than 1uA off current in shutdown
mode.
The 1.1MHz switching frequency allows for
smaller external components; the internal
compensation and soft start minimize the
external component count, all helps to produce
a compact solution for a wide range of load
current.
•
•
•
0.8V Low Voltage Start-Up
Internal Synchronous Rectifier
Current Mode Control with Internal
Compensation
Short-Circuit Protection
1.1MHz Fixed Frequency Switching
0.8V to 5V Input Range
2.5V to 5V Output Range
Tiny External Components
Small 6-lead ThinSOT Package
•
•
•
•
•
•
APPLICATION
•
Single-cell, Two-cell and Three-cell Alkaline,
NiCd or NiMH or single-cell Li Battery
Consumer Products
MP3 Players
Wireless Mouse
•
•
•
Audio Recorders
The MP3120 features an integrated power
MOSFET that supports up to 5V output and a
typical 1.2A switch current.
“Monolithic Power Systems”, “MPS”, and “The Future of Analog IC
Technology” are Registered Trademarks of Monolithic Power Systems,
Inc.
The device also can maintain the output voltage
regulated even when the input voltage is above
the output voltage.
The MP3120 is offered in a 6-lead ThinSOT23
package
TYPICAL APPLICATION
Efficiency
VOUT=3.3V
C5
R3
NC
NC
VIN
VIN=3V
100
1
SW
80
VOUT
VIN=1V
6
4
5
3
IN
OUT
FB
VIN=2V
3.3V
60
40
20
0
VIN=4.4V
EN
ON/OFF
GND
2
1
10
100
1000
OUTPUT CURRENT (mA)
MP3120 Rev. 0.93
9/20/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
1
MP3120-1.2A, 1.1MHz SYNCHRONOUS BOOST
ORDERING INFORMATION
Part Number*
Package
Top Marking
Free Air Temperature (TA)
MP3120DJ
TSOT23-6
9A
-40°C to + 85°C
* For Tape & Reel, add suffix –Z (eg. MP3120DJ–Z).
For RoHS compliant packaging, add suffix –LF (eg. MP3120DJ–LF–Z)
PACKAGE REFERENCE
TOP VIEW
SW
GND
FB
1
2
3
6
5
4
IN
OUT
EN
Thermal Resistance (4) θJA
TSOT23-6…………………..220…....110…°C /W
θJC
ABSOLUTE MAXIMUM RATINGS (1)
VIN Voltage........................................-0.3V to 5V
SW Voltage.......................................-0.3V to 7V
EN, FB Voltage.................................-0.3V to 6V
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.
VOUT Voltage .....................................-0.3V to 6V
Continuous Power Dissipation (TA=+25°C) (2)
........................................................... 0.45W
Operation temperature TA ......... -40°C to + 85°C
Junction temperature TJ.......... -40°C to + 125°C
Lead temperature .....................................250°C
Storage temperature............... -65°C to + 150°C
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7, 4-layer PCB.
Recommended Operating Conditions (3)
Supply Voltage VIN .............................0.8V to 5V
Operating Junct. Temp (TJ)..... –40°C to +125°C
MP3120 Rev. 0.93
9/20/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
2
MP3120-1.2A, 1.1MHz SYNCHRONOUS BOOST
ELECTRICAL CHARACTERISTICS
VIN =1.8V, VOUT=5V. TA=25°C. VEN=5V, unless otherwise noted.
Parameters
Symbol Condition
Min
Typ
0.7
Max
0.85
0.52
1.25
100
Units
V
Minimum Startup Voltage
Minimum Operating Voltage(5)
Feedback Voltage
VST
VIN
VFB
IFB
VOUT=0V
VEN=VIN
0.3
V
1.17
1.21
0.9
V
Feedback Input Current
VFB=1.2V
nA
Measured on VOUT
,
Quiescent Current (Active)
VFB=1.3V,
Switching
No
IQ
470
0.1
600
1
μA
Measured
VOUT=0V
on
VIN,
Quiescent Current(Shutdown)
IQ_SHDN
uA
NMOS Switch On Resistance
PMOS Switch On Resistance
RN-MOS(on)
RP-MOS(on)
290
530
mΩ
mΩ
NMOS Switch Leakage
PMOS Switch Leakage
VSW=VIN=6V
0.1
0.1
5
1
uA
uA
VSW=0V, VOUT=6V
NMOS Current Limit
PMOS Current Limit
Maximum Duty Cycle
Minimum On Time
Switching Frequency
EN Input High
ILIM(close)
ILIM(open)
DMAX
T(on)min
fSW
1.2
1.2
A
A
VFB=1.1V
85
91.5
120
1050
98
%
ns
kHz
V
865
0.7
1155
VEN
EN Input Low
VEN
0.15
2.6
V
Soft-Start Time
TS
0.7
1.6
ms
Notes:
5) Minimum VIN operation after start-up is limited by the battery’s ability to provide the necessary power as it enters a deeply discharged state.
PIN FUNCTIONS
Pin #
Name
Pin Function
Output switch node. SW is the drain of the internal N-Channel and P-Channel
MOSFETs. Connect the inductor to SW to complete the step-up converter.
1
2
3
SW
GND
FB
Ground
Feedback input to the error amplifier. Connect resistor divider to this pin. The output
voltage can be adjusted from 2.5V to 5V by: VOUT =1.2V* [1 + (R1/R2)]
Regulator on/off control input. A logic high input (VEN>0.5V) turns on the regulator. A
logic low input (VEN<0.17V) turns off the regulator.
4
EN
Output node. OUT is the source of the P-Channel MOSFET. Connect the OUT pin to
the output of the converter. The output capacitor must be as close as possible to the
IC and provide shortest PCB trace loop between IC OUT pin and GND pin.
5
6
OUT
IN
Input node
MP3120 Rev. 0.93
9/20/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
3
MP3120-1.2A, 1.1MHz SYNCHRONOUS BOOST
TYPICAL PERFORMANCE CHARACTERISTICS
C1=10μF, C2=C3=4.7μF, L1=4.7μH, TA=25°C, unless otherwise noted.
Efficiency vs. Output Current
Efficiency vs. Output Current
Load Regulation vs.
Output Current
VOUT=3.3V
VOUT=3.3V
VOUT=5V
0.2
0.0
VIN=4.4V
VIN=3V
V
IN=3V
100
80
60
40
20
0
100
80
60
40
20
0
-0.2
-0.4
-0.6
-0.8
-1.0
-1.2
-1.4
VIN=1V
V
IN=1V
V
IN=2V
VIN=2V
VIN=1V
VIN=4.4V
VIN=3V
VIN=2V
1
10
100
1000
1
10
100
1000
1
10
100
1000
OUTPUT CURRENT(mA)
OUTPUT CURRENT(mA)
OUTPUT CURRENT(mA)
Current Limit
Steady Waveform
Steady Waveform
VIN=2.5V, VOUT=3.3V, IOUT=0mA
VIN=2.5V, VOUT=3.3V, IOUT=500mA
2
VIN
VIN
1V/div
1.8
1.6
1.4
1.2
1
1V/div
SW
SW
2V/div
2V/div
IL
IL
0.5V/div
VOUT
0.5V/div
VOUT
2V/div
0.8
0.6
0.4
2V/div
1us/div
1us/div
20 25 30 35 40 45 50 55 60 65
DUTY (%)
Steady Waveform
Steady Waveform
VIN=4.4V, VOUT=3.3V, IOUT=0mA
VIN=4.4V, VOUT=3.3V, IOUT=500mA
VIN
2V/div
VIN
2V/div
SW
SW
2V/div
2V/div
IL
IL
0.5V/div
VOUT
0.5V/div
VOUT
2V/div
2V/div
40us/div
1us/div
MP3120 Rev. 0.93
9/20/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
4
MP3120-1.2A, 1.1MHz SYNCHRONOUS BOOST
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
C1=10μF, C2=C3=4.7μF, L1=4.7μH, TA=25°C, unless otherwise noted.
Load Transient Waveform
VIN=2.5V,VOUT=3.3V,
VIN Startup
VIN=2.5V,VOUT=3.3V,IOUT=500mA
EN Startup
VIN=2.5V,VOUT=3.3V,IOUT=500mA
I
OUT=0mA to 200mA
VEN
VIN
5V/div
2V/div
ILOAD
200mA/div
SW
2V/div
SW
2V/div
IL
IL
V
OUT/AC
0.5A/div
0.5A/div
50mV/div
VOUT
2V/div
VOUT
2V/div
20ms/div
20ms/div
VIN Shut down
VIN=2.5V,VOUT=3.3V,IOUT=500mA
EN Shut down
VIN=2.5V,VOUT=3.3V,IOUT=500mA
Short Circuit and Recovery
VIN=3V
VEN
5V/div
VIN
2V/div
VIN
2V/div
SW
2V/div
SW
2V/div
SW
2V/div
IL
IL
IL
0.5A/div
0.5A/div
0.5A/div
VOUT
2V/div
VOUT
2V/div
VOUT
2V/div
20ms/div
20ms/div
200ms/div
Short Circuit Steady Waveform
VIN=3V
VIN
2V/div
SW
2V/div
IL
0.5A/div
VOUT
2V/div
MP3120 Rev. 0.93
9/20/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
5
MP3120-1.2A, 1.1MHz SYNCHRONOUS BOOST
BLOCK DIAGRAM
IN
OUT
Reference
Oscillator
EN
Logic
Driver
SW
_
_
GND
+
+
_
Ġ
+
_
FB
Error Amplifier
Current Sense
Amplifier
Figure 1—Function Block Diagram
OPERATION
The MP3120 is a 1.1MHz synchronous boost
converter housed in a TSOT-23 package, it is
able to operate from an input voltage as low as
0.8V. The device features fixed frequency,
current mode PWM control, true output
disconnection, and short circuit protection.
Detailed descriptions of the different operating
modes can be seen as follow. Operation can be
best understood by referring to the Function
Block Diagram.
ability of the battery to supply sufficient energy to
the output. Soft-start and inrush current limiting
are provided during start-up as well as normal
mode operation.
Device Enable
The device starts to work when EN is higher than
0.5V. And it shuts down when EN is lower than
0.17V. In shutdown mode, the regulator stops
switching, all internal control circuit is off, and the
load is disconnected from the input.
Low Voltage Start-Up
Error Amp
The MP3120 includes an independent start-up
oscillator designed to start up at input voltage of
0.8V.In this mode, the IC operates with about
65% duty cycle and open-loop. Once the output
voltage exceeds 2.3V, the start-up circuit is
disabled and normal close-loop PWM operation
is initiated. In normal mode, the MP3120 is
powered by VOUT instead of VIN. This feature
allows the battery voltage to drop even below
0.8V without affecting the circuit operation. The
only limiting factor in the application becomes the
The error amplifier is an internally compensated
transconductance type amplifier. The internal
1.2V reference voltage is compared with the
voltage at the FB pin to generate an error signal
at the output of the error amplifier.
MP3120 Rev. 0.93
9/20/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
6
MP3120-1.2A, 1.1MHz SYNCHRONOUS BOOST
prevent the chip from burning out caused by
excessive overload or short circuit. In the event
of a short circuit, the current limit reduces to a
smaller value. The thermal protection circuit also
functions in addition to the current limit in case of
the device temperature rise up to above 125ºC.
Current Sensing
Lossless current sensor converts the N-MOS
switch current signal to a voltage signal and it is
summed with the internal slope compensation.
The summed signal is compared with the error
amplifier output to provide a series of PWM
signal. The current limit threshold is about 1.2A
which is independent of input and output voltage.
The switch current signal is blanked for 60ns to
enhance noise rejection.
VOUT< VIN Operation
The MP3120 maintains the output voltage to be
regulated even if the input voltage is above the
output voltage. In this mode the P-MOS no
longer acts as a low impedance switch, there will
be more power dissipation within the IC. This will
cause a sharp drop in the efficiency. The
maximum output current should be limited in
order to maintain an acceptable junction
temperature.
Synchronous Rectifier
The P-MOS synchronous rectifier is only enabled
when VOUT > (VIN + 0.1V) and the FB pin is above
800mV.
Thermal Shutdown
An internal temperature monitor will start to
reduce the peak current limit if the die
temperature exceeds 125ºC. If the die
temperature continues to rise and reaches to
160ºC, the part will thermally shutdown, all
switches will be turned off. The part will be
enabled again when the die temperature drops
by about 20ºC.
Output Disconnect and Inrush Current
Limiting
The MP3120 is designed to allow true output
disconnect by eliminating body diode conduction
of the internal PMOS rectifier. This allows VOUT
to go to zero volts during shutdown, and drawing
zero current from the input source. It also allows
for inrush current limiting during start-up,
minimizing surge currents from the input. Note
that to obtain the advantage of output disconnect,
there must be no external schottky diode
connected between the SW pin and OUT pin.
Board layout is extremely critical to minimize
voltage spike on SW pin caused by stray
inductance. Keep the output filter capacitors as
close as possible to the OUT pin and use very
low ESR/ESL ceramic capacitors tied to a good
ground plane.
Short Circuit Protection
Unlike most boost converters, the MP3120 allows
the output to be short circuit due to the output
disconnect feature. The device incorporates
internal features such as current limit feedback,
thermal regulation and thermal shutdown to
MP3120 Rev. 0.93
9/20/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
7
MP3120-1.2A, 1.1MHz SYNCHRONOUS BOOST
Setting the Output Capacitor
APPLICATION INFORMATION
Setting the Output Voltage
The external voltage divider from OUT to GND
programs the output voltage via FB from 2.5V to
5V according to the formula:
The output current to the step-up converter is
discontinuous, therefore a capacitor is essential
to supply the AC current to the load. Use low
ESR capacitors for the best performance.
Ceramic capacitors with X7R dielectrics are
highly recommended because of their low ESR
and small temperature coefficient. The output
voltage ripple can be estimated by:
R1
⎛
⎝
⎞
V
=1.2V × 1+
⎜
⎟
OUT
R2⎠
Setting the Inductor
The inductor with 1.6A current rating and low DC
resistance is recommended. The inductance
value can be calculated from the following
formula:
V
V
OUT
OUT
ΔVOUT
=
× (1 −
)
C
× f × R
V
OUT
2
S
L
Typically, a 10μF X7R ceramic capacitor is
recommended.
V
× (V
− V
IN
)
IN
OUT
× Δi × f
L =
V
s
OUT
L
RC Snubber Circuit
Where ΔiL is the inductor current ripple. It is
recommended the inductor current ripple to be
around 30%~50% of the input current.
When the chip is used in VOUT=5V condition, a
RC snubber should be added to protect the
MOSFET from over voltage. The recommended
parameters are R3=5.1Ω, C5=1nF. The circuit
can be seen in Figure 2.
Setting the Input Capacitor
The input capacitor (C1) is required to maintain
the DC input voltage. Ceramic capacitors with
low ESR/ESL types are recommended. The input
voltage ripple can be estimated by:
V
V
IN
IN
ΔV
IN
=
× (1 −
)
2
V
8 × f × L × C
OUT
s
1
Typically, a 10μF X7R ceramic capacitor is
recommended.
C5
1nF
VIN
0.8V~5V
1
SW
VOUT
5V
6
4
5
3
IN
OUT
FB
EN
ON/OFF
GND
2
Figure2—VOUT=5V Typical Application Circuit
MP3120 Rev. 0.93
9/20/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
8
MP3120-1.2A, 1.1MHz SYNCHRONOUS BOOST
PCB Layout
PCB layout is very important to achieve stable
operation. Please follow these guidelines and
take Figure 3 for references.
2) Adding RC snubber circuit from SW pin to
GND pin to reduce the SW spike in 5V
application.
1) The output capacitor should be placed as
close as possible to IC and forms a smallest
loop with IC SW and GND pins. as C4 shown
in figure2.
3) Route SW away from sensitive analog areas
such as FB.
C4 R1 C3
C2 C3
C1
L1
R2
C5 R3
Top Layer
Bottom Layer
Figure3—PCB Layout
MP3120 Rev. 0.93
9/20/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
9
MP3120-1.2A, 1.1MHz SYNCHRONOUS BOOST
PACKAGE INFORMATION
TSOT23-6
0.95
BSC
0.60
TYP
2.80
3.00
6
4
1.20
TYP
See Note 7
EXAMPLE
TOP MARK
1.50
1.70
2.60
3.00
2.60
TYP
AAAA
PIN 1
1
3
TOP VIEW
RECOMMENDED LAND PATTERN
0.84
0.90
1.00 MAX
0.09
0.20
SEATING PLANE
0.30
0.50
0.00
0.10
0.95 BSC
SEE DETAIL "A"
SIDE VIEW
FRONT VIEW
NOTE:
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH,
PROTRUSION OR GATE BURR.
GAUGE PLANE
0.25 BSC
3) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD FLASH
OR PROTRUSION.
4) LEAD COPLANARITY(BOTTOM OF LEADS AFTER FORMING)
SHALL BE0.10 MILLIMETERS MAX.
5) DRAWING CONFORMS TO JEDEC MO-193, VARIATION AB.
6) DRAWING IS NOT TO SCALE.
0.30
0.50
0o-8o
7) PIN 1 IS LOWER LEFT PIN WHEN READING TOP MARK FROM
LEFT TO RIGHT, (SEE EXAMPLE TOP MARK)
DETAIL 揂
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.
MP3120 Rev. 0.93
9/20/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
10
相关型号：
MP3120DJ-LF-Z
Switching Regulator, Current-mode, 1155kHz Switching Freq-Max, PDSO6, TSOT-23, 6 PIN
MPS
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