MP3115DT [MPS]

High-Efficiency, Single-Cell Alkaline, 1.3MHz Synchronous Step-up Converter with Output Disconnect;
MP3115DT
型号: MP3115DT
厂家: MONOLITHIC POWER SYSTEMS    MONOLITHIC POWER SYSTEMS
描述:

High-Efficiency, Single-Cell Alkaline, 1.3MHz Synchronous Step-up Converter with Output Disconnect

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MP3115  
High-Efficiency, Single-Cell Alkaline, 1.3MHz  
Synchronous Step-up Converter  
with Output Disconnect  
The Future of Analog IC Technology  
DESCRIPTION  
FEATURES  
The MP3115 is a synchronous, fixed frequency,  
current mode step-up converter with output-to-  
input disconnect optimized to boost a single AA  
Alkaline battery to 2.5V or 3.3V.  
Over 90% Efficiency  
Output-to-Input Disconnect in Shutdown  
Mode  
Internal Synchronous Rectifier  
Output Voltage up to 4.0V without an  
External Schottky Diode  
Inrush Current Limiting and Internal  
Soft-Start  
It can startup from an input voltage as low as  
0.950V 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 an external schottky diode. The  
output disconnect feature allows the output to be  
completely discharged, thus allowing the part to  
draw less than 1µA of current in shutdown mode.  
Internal Compensation  
1A Minimum Peak Current Limit  
1.3MHz Fixed Switching Frequency  
Zero Current Shutdown Mode  
Thermal Shutdown  
6-Pin SOT-23 Package  
The 1.3MHz switching frequency allows for the  
use of smaller external components and the  
internal compensation and soft-start minimize  
the external component count, all helping to  
produce a compact solution for a wide range of  
load current.  
APPLICATIONS  
Single-cell Alkaline Consumer Products  
MP3 Players  
Wireless Mouse  
RFTags  
Audio Recorders  
The MP3115 regulates the output voltage up to  
4.0V or 3.3V at 200mA from a single cell AA  
battery, without the use of an external Schottky  
diode.  
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of  
Monolithic Power Systems, Inc.  
The MP3115 is offered in a SOT23-6 package.  
EVALUATION BOARD REFERENCE  
Board Number  
Dimensions  
EV3115DT-00A L x W x H (5cm x 5cm x 1.2cm)  
TYPICAL APPLICATION  
0.95V to 2.5V  
1
VIN  
3.3V  
5
OUT  
SW  
VOUT  
MP3115  
6
4
IN  
3
EN  
FB  
GND  
EN  
2
MP3115 Rev. 0.9  
4/12/2016  
www.MonolithicPower.com  
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.  
© 2016 MPS. All Rights Reserved.  
1
MP3115 – HIGH-EFFICIENCY 1.3MHz SYNCHRONOUS STEP-UP CONVERTER  
PACKAGE REFERENCE  
ABSOLUTE MAXIMUM RATINGS (1)  
Supply Voltage VIN...................................... 2.5V  
VSW................................................ –0.3V to 6.5V  
All Other Pins................................ –0.3V to 6.5V  
Storage Temperature ..............–65°C to +150°C  
TOP VIEW  
SW  
GND  
FB  
1
2
3
6
5
4
IN  
Thermal Resistance (3)  
θJA  
θJC  
OUT  
EN  
SOT23-6................................195.... 110.. °C/W  
Notes:  
1) Exceeding these ratings may damage the device.  
2) The device is not guaranteed to function outside of its  
operating conditions.  
Part Number*  
MP3115DT  
Package  
Temperature  
3) Measured on approximately 1” square of 1 oz copper.  
SOT23-6  
–40°C to +85°C  
For Tape & Reel, add suffix –Z (eg. MP3115DT–Z)  
For RoHS Compliant Packaging, add suffix –LF  
(eg. MP3115DT–LF–Z)  
*
ELECTRICAL CHARACTERISTICS  
VIN = 1.5V, VEN = VOUT = 3.3V, TA = +25°C, unless otherwise noted.  
Parameter  
Symbol Condition  
Min  
Typ  
Max  
1.1  
0.5  
4.0  
1
Units  
V
Minimum Startup Voltage  
Minimum Operating Voltage (4)  
Output Voltage Range  
Supply Current (Shutdown)  
Supply Current (Quiescent)  
Feedback Voltage  
VST  
VIN  
RL = 3k, Rising Edge  
0.95  
VEN = VIN  
V
VOUT  
2.5  
V
VEN = VOUT = 0V  
VFB = 1.3V  
0
200  
1.225  
10  
μA  
μA  
V
VFB  
fSW  
Feedback Input Current  
Switching Frequency  
Maximum Duty Cycle  
EN Input Low Voltage  
EN Input High Voltage  
EN Input Current  
VFB = 1.2V  
VFB= 1.1V  
nA  
MHz  
%
1.3  
DMAX VFB= 1.1V  
85  
90  
0.4  
1
V
0.9  
V
VEN = 3V  
VSW = 5.5V  
0
μA  
mΩ  
μA  
A
NMOS On Resistance  
NMOS Leakage Current  
NMOS Current Limit  
PMOS On Resistance  
PMOS Leakage Current  
Thermal Shutdown (5)  
Thermal Shutdown Hysteresis (5)  
Minimum On Time (5)  
Notes:  
RNMOS  
ILIM  
300  
1
1
1.3  
600  
1
RPMOS  
mΩ  
μA  
°C  
°C  
ns  
VEN = VOUT = 0V, VSW = 3V  
160  
30  
100  
150  
4) The MP3115 is not dependent on VIN when VOUT is greater than 2.4V.  
5) Guaranteed by design, not tested.  
MP3115 Rev. 0.9  
4/12/2016  
www.MonolithicPower.com  
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.  
© 2016 MPS. All Rights Reserved.  
2
MP3115 – HIGH-EFFICIENCY 1.3MHz SYNCHRONOUS STEP-UP CONVERTER  
PIN FUNCTIONS  
Pin # Name Description  
1
SW 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.  
2
3
GND Ground.  
FB  
Regulation Feedback Input. Connect an external resistive voltage divider from the output to FB  
to set the output voltage.  
4
5
6
EN  
Regulator On/Off Control Input. A logic high input (VEN > 0.9V) turns on the regulator. A logic  
low input (VEN < 0.4V) puts the MP3115 into low current shutdown mode.  
OUT Supply Input for the MP3115 and Output Voltage Sense Input. Connect to the output of the  
converter.  
IN  
Input Voltage.  
MP3115 Rev. 0.9  
4/12/2016  
www.MonolithicPower.com  
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.  
© 2016 MPS. All Rights Reserved.  
3
MP3115 – HIGH-EFFICIENCY 1.3MHz SYNCHRONOUS STEP-UP CONVERTER  
TYPICAL PERFORMANCE CHARACTERISTICS  
C1 = 10µF, C2=22µF, L=1.7µH,R2=20K, TA = +25ºC, unless otherwise noted.  
Efficiency vs.  
Load Current  
Efficiency vs.  
Load Current  
Load Regulation  
95  
90  
95  
90  
2.60  
2.56  
2.52  
85  
80  
85  
80  
75  
70  
75  
70  
2.48  
V
V
V
IN=1.5V  
IN=2.5V  
OUT=3.3V  
V
V
IN=1.5V  
OUT=2.5V  
2.44  
2.40  
65  
V
IN=1.5V  
65  
60  
60  
10  
100  
LOAD CURRENT (mA)  
1000  
10  
100  
LOAD CURRENT (mA)  
1000  
0
50  
100  
150  
200  
250  
LOAD CURRENT (mA)  
Minimum Start  
Line Regulation  
IPEAK vs. Duty Cycle  
V
IN vs. IOUT  
2.60  
2.56  
2.52  
2.0  
1.8  
1.6  
1700  
1500  
V
OUT=3.3V  
1300  
1100  
1.4  
1.2  
2.48  
2.44  
2.40  
900  
700  
V
OUT=2.5V  
1.0  
0.8  
I
OUT=100mA  
30  
40  
50  
60  
70  
80  
10  
13  
16  
19  
22 25  
0
30  
60  
90  
120  
150  
INPUT VOLTAGE (V)  
OUTPUT CURRENT (mA)  
Duty Cycle (%)  
Inrush Current  
Line Transient  
Load Transient  
V
EN=2V,VIN=1.5V,VOUT=3.3V  
V
IN=1.2V to 2V,VOUT=2.5V, IOUT=48mA  
EN=VIN,Resistor Load  
V
IN=1.2V,VOUT=2.5V,IOUT=0mA to 50mA  
EN=VIN,Resistor Load  
IOUT=41mA,CFF=10nF  
V
V
V
EN  
V
OUT  
2V/div.  
50mV/div.  
VIN  
1V/div.  
VOUT  
2V/div.  
VOUT  
0.1V/div.  
I
IN  
I
OUT  
0.2A/div.  
50mA/div.  
1ms/div.  
200 s/div.  
40 s/div.  
MP3115 Rev. 0.9  
4/12/2016  
www.MonolithicPower.com  
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.  
© 2016 MPS. All Rights Reserved.  
4
MP3115 – HIGH-EFFICIENCY 1.3MHz SYNCHRONOUS STEP-UP CONVERTER  
TYPICAL PERFORMANCE CHARACTERISTICS (continued)  
C1 = 10µF, C2=22µF, L=1.7µH,R2=20K, TA = +25ºC, unless otherwise noted.  
VIN  
1V/div.  
VIN  
0.5V/div.  
VIN  
0.5V/div.  
VSW  
2V/div.  
VSW  
2V/div.  
VSW  
2V/div.  
VOUT  
VOUT  
VOUT  
2V/div  
2V/div  
2V/div  
IL  
VEN  
2V/div.  
VEN  
2V/div.  
1A/div.  
1ms/div  
10ms/div  
20ms/div.  
Short Circuit  
VIN=VEN=2V, VOUT=3.3V  
Short Circuit Recovery  
VIN=VEN=2V, VOUT=3.3V  
VIN  
VIN  
2V/div.  
2V/div.  
VIN  
1V/div.  
VSW  
2V/div.  
VSW  
2V/div.  
VSW  
2V/div.  
VO  
VOUT  
5V/div  
5V/div.  
VOUT  
2V/div  
IL  
IL  
IL  
0.2A/div.  
0.2A/div.  
1A/div.  
20ms/div.  
No Load Ripple  
VIN=VEN=0.92V, VOUT=3.3V  
IOUT=0mA  
Full Load Ripple  
VIN=VEN=0.95V, VOUT=3.3V  
IOUT=150mA  
VIN  
1V/div.  
VIN  
1V/div.  
VSW  
2V/div.  
VSW  
2V/div.  
VOUT  
10mV/div  
VOUT  
50mV/div  
IL  
IL  
1A/div.  
1A/div.  
MP3115 Rev. 0.9  
4/12/2016  
www.MonolithicPower.com  
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.  
© 2016 MPS. All Rights Reserved.  
5
MP3115 – HIGH-EFFICIENCY 1.3MHz SYNCHRONOUS STEP-UP CONVERTER  
OPERATION  
6
IN  
5
OUT  
STARTUP  
SOFT-START  
PROTECTION  
4
EN  
OSC  
1.3MHz  
CONTROL  
LOGIC  
1
2
SW  
BIAS  
RAMP  
+
RSENSE  
CURRENT  
SENSE  
AMPLIFIER  
GND  
PWM  
COMPARATOR  
3
FB  
ERROR  
AMPLIFIER  
Figure 1—Functional Block Diagram  
The MP3115 uses a 1.3MHz fixed-frequency,  
current-mode regulation architecture to regulate  
the output voltage. The MP3115 measures the  
output voltage through an external resistive  
voltage divider and compares that to the  
internal 1.2V reference to generate the error  
voltage. The current-mode regulator compares  
the error voltage to the inductor current to  
regulate the output voltage. The use of current-  
mode regulation improves transient response  
and control loop stability.  
At the beginning of each cycle, the N-channel  
MOSFET switch is turned on, forcing the  
inductor current to rise. The current at the  
source of the switch is internally measured and  
converted to a voltage by the current sense  
amplifier. That voltage is compared to the error  
voltage. When the inductor current rises  
sufficiently, the PWM comparator turns off the  
switch, forcing the inductor current to the output  
capacitor through the internal P-Channel  
MOSFET rectifier, which forces the inductor  
current to decrease. The peak inductor current  
is controlled by the error voltage, which in turn  
is controlled by the output voltage. Thus the  
output voltage controls the inductor current to  
satisfy the load.  
When the MP3115 is disabled (EN<0.4V), both  
power switches are off. The body of the  
P-Channel MOSFET connects to SW thus there  
is no current path from SW to OUT. When the  
MP3115 is enabled (EN>0.8V), the P-Channel  
MOSFET turns on to charge the output  
capacitor to a voltage close to the input voltage.  
During this time, the gate of the P-Channel is  
controlled to limit the chip power dissipation.  
The MP3115 starts switching when the output  
voltage is close to the input voltage. If the input  
voltage is less than 1.6V, the MP3115 will start  
with CCM (constant current mode) until the  
output voltage crosses 1.6V. After that, the  
soft-start circuit will take over to bring the output  
voltage to the regulated value.  
The MP3115 has a temperature sensing circuit  
to protect the part. The MP3115 turns off both  
switches when the chip temperature reaches  
150°C.  
MP3115 Rev. 0.9  
4/12/2016  
www.MonolithicPower.com  
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.  
© 2016 MPS. All Rights Reserved.  
6
MP3115 – HIGH-EFFICIENCY 1.3MHz SYNCHRONOUS STEP-UP CONVERTER  
APPLICATION INFORMATION  
Selecting the Inductor  
COMPONENT SELECTION  
The inductor is required to force the output  
voltage higher while being driven by the lower  
input voltage. A good rule for determining the  
inductance is to allow the peak-to-peak ripple  
current to be approximately 30%-50% of the  
maximum input current. Make sure that the  
peak inductor current is below the minimum  
current limit at the duty cycle used to prevent  
loss of regulation due to current limit variation.  
Setting the Output Voltage  
Set the output voltage by selecting the resistive  
voltage divider ratio. The voltage divider drops  
the output voltage to the 1.2V feedback voltage.  
Use 20kfor the low-side resistor (R2) of the  
voltage divider. Determine the high-side resistor  
(R1) by the equation:  
VOUT VFB  
R1=  
V
FB  
Calculate the required inductance value L using  
the equations:  
R2  
Where VOUT is the output voltage, VFB is the  
1.2V feedback voltage and R2=20k.  
VIN(VOUT - VIN )  
L =  
VOUT × fSW × ΔI  
Selecting the Input Capacitor  
VOUT ×ILOAD  
(MAX)  
An input capacitor is required to supply the AC  
ripple current to the inductor while limiting noise  
at the input source. Multi-layer ceramic  
capacitors are recommended as they have  
extremely low ESR and are available in small  
footprints. Use an input capacitor of 4.7μF or  
greater, and place it physically close to the  
device.  
IIN(MAX)  
=
VIN ×η  
30% 50% IIN(MAX)  
ΔI =  
(
)
Where ILOAD(MAX) is the maximum load current, ΔI  
is the peak-to-peak inductor ripple current and η  
is the efficiency. For the MP3115, 4.7µH is  
recommended for most applications. Choose an  
inductor that does not saturate at the peak  
switch current as calculated above with  
additional margin to cover for heavy load  
transients and extreme startup conditions.  
Selecting the Output Capacitor  
A single 4.7µF to 10µF ceramic capacitor  
normally provides sufficient output capacitance  
for most applications. Larger values (up to 22µF)  
may be used to obtain extremely low output  
voltage ripple and improve transient response.  
The impedance of the ceramic capacitor at the  
switching frequency is dominated by its  
capacitance, so the output voltage ripple is  
mostly independent of ESR. The output voltage  
ripple VRIPPLE is calculated as:  
Selecting the Feed-Forward Capacitor  
A feed-forward capacitor in parallel with the  
high-side resistor R1 can be added to improve  
the output ripple at both discontinuous  
conduction modes and the load transient  
response. A 47pF capacitor is recommended  
for most applications.  
ILOAD  
(
UT  
VO VIN  
)
UT  
LAYOUT CONSIDERATIONS  
VRIPPLE  
=
VO × C2× fSW  
High frequency switching regulators require  
very careful layout for stable operation and low  
noise. All components must be placed as close  
to the IC as possible. All feedback components  
must be kept close to the FB pin to prevent  
noise injection on the FB pin trace. The ground  
return of C1 and C2 should be tied close to the  
GND pin. See the MP3115 demo board layout  
for reference.  
Where VIN is the input voltage, ILOAD is the load  
current, C2 is the capacitance of the output  
capacitor and fSW is the 1.3MHz switching  
frequency.  
MP3115 Rev. 0.9  
4/12/2016  
www.MonolithicPower.com  
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.  
© 2016 MPS. All Rights Reserved.  
7
MP3115 – HIGH-EFFICIENCY 1.3MHz SYNCHRONOUS STEP-UP CONVERTER  
PACKAGE INFORMATION  
SOT23-6  
PACKAGE OUTLINE DRAWING FOR 6-SOT23  
MF-PO-D-0032 revision 2.1  
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  
TYP  
2.60  
3.00  
AAAA  
PIN 1  
1
3
TOP VIEW  
RECOMMENDED LAND PATTERN  
0.90  
1.30  
1.45 MAX  
0.09  
0.20  
SEATING PLANE  
0.30  
0.50  
0.00  
0.15  
SEE DETAIL "A"  
0.95 BSC  
FRONT VIEW  
SIDE 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 BE 0.10 MILLIMETERS MAX.  
5) DRAWING CONFORMS TO JEDEC MO-178, VARIATION AB.  
6) DRAWING IS NOT TO SCALE.  
0.30  
0.55  
0o-8o  
7) PIN 1 IS LOWER LEFT PIN WHEN READING TOP MARK FROM  
LEFT TO RIGHT, (SEE EXAMPLE TOP MARK)  
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.  
MP3115 Rev. 0.9  
4/12/2016  
www.MonolithicPower.com  
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.  
© 2016 MPS. All Rights Reserved.  
8

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