MP3115
The Future of Analog IC Technology
High-Efficiency, Single-Cell Alkaline, 1.3MHz
Synchronous Step-up Converter
with Output Disconnect
DESCRIPTION
FEATURES
The MP3115 is a synchronous, fixed frequency,
current mode step-up converter with output-toinput disconnect optimized to boost a single AA
Alkaline battery to 2.5V or 3.3V.
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•
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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.
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•
•
•
•
•
•
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.
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
Internal Compensation
1A Minimum Peak Current Limit
1.3MHz Fixed Switching Frequency
Zero Current Shutdown Mode
Thermal Shutdown
6-Pin SOT-23 Package
APPLICATIONS
•
•
•
•
•
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.
Single-cell Alkaline Consumer Products
MP3 Players
Wireless Mouse
RFTags
Audio Recorders
“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
VIN
1
6
4
OUT
SW
5
3.3V
VOUT
MP3115
IN
EN
FB
3
GND
EN
MP3115 Rev. 0.9
4/12/2016
2
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1
MP3115 – HIGH-EFFICIENCY 1.3MHz SYNCHRONOUS STEP-UP CONVERTER
ABSOLUTE MAXIMUM RATINGS (1)
PACKAGE REFERENCE
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
1
6
IN
GND
2
5
OUT
FB
3
4
EN
Thermal Resistance
θJA
θJC
SOT23-6 ................................ 195 .... 110.. °C/W
Part Number*
Package
Temperature
MP3115DT
SOT23-6
–40°C to +85°C
*
(3)
Notes:
1) Exceeding these ratings may damage the device.
2) The device is not guaranteed to function outside of its
operating conditions.
3) Measured on approximately 1” square of 1 oz copper.
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
Minimum Startup Voltage
Minimum Operating Voltage (4)
Output Voltage Range
Supply Current (Shutdown)
Supply Current (Quiescent)
Feedback Voltage
Feedback Input Current
Switching Frequency
Maximum Duty Cycle
EN Input Low Voltage
EN Input High Voltage
EN Input Current
NMOS On Resistance
NMOS Leakage Current
NMOS Current Limit
PMOS On Resistance
PMOS Leakage Current
Symbol Condition
VST
RL = 3kΩ, Rising Edge
VIN
VEN = VIN
VOUT
VEN = VOUT = 0V
VFB = 1.3V
VFB
VFB = 1.2V
fSW
VFB= 1.1V
DMAX VFB= 1.1V
Minimum On Time
Typ
0.95
2.5
85
0
200
1.225
10
1.3
90
Max
1.1
0.5
4.0
1
0.4
0.9
VEN = 3V
RNMOS
VSW = 5.5V
ILIM
RPMOS
1
VEN = VOUT = 0V, VSW = 3V
Thermal Shutdown (5)
Thermal Shutdown Hysteresis
Min
(5)
(5)
0
300
1
1.3
600
1
1
Units
V
V
V
μA
μA
V
nA
MHz
%
V
V
μA
mΩ
μA
A
mΩ
μA
160
°C
30
°C
ns
100
150
Notes:
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
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© 2016 MPS. All Rights Reserved.
2
MP3115 – HIGH-EFFICIENCY 1.3MHz SYNCHRONOUS STEP-UP CONVERTER
PIN FUNCTIONS
Pin #
Name Description
1
SW
2
GND
3
FB
Regulation Feedback Input. Connect an external resistive voltage divider from the output to FB
to set the output voltage.
4
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.
5
OUT
6
IN
MP3115 Rev. 0.9
4/12/2016
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.
Ground.
Supply Input for the MP3115 and Output Voltage Sense Input. Connect to the output of the
converter.
Input Voltage.
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3
MP3115 – HIGH-EFFICIENCY 1.3MHz SYNCHRONOUS STEP-UP CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
95
90
90
85
80
75
70
VIN=1.5V
VOUT=2.5V
60
10
85
80
75
VIN=1.5V
VIN=2.5V
VOUT=3.3V
70
65
100
LOAD CURRENT (mA)
60
10
1000
2.0
2.56
1.8
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
2.60
2.52
2.48
2.44
2.40
1.6
1.4
1.2
0.8
0
25
30
60
90
120
OUTPUT CURRENT (mA)
150
Line Transient
Load Transient
VIN=1.2V,VOUT=2.5V,IOUT=0mA to 50mA
VEN=VIN,Resistor Load
VIN=1.5V
50
100
150
200
LOAD CURRENT (mA)
250
1500
VOUT=3.3V
1300
1100
900
VOUT=2.5V
700
30
40
50
60
70
Duty Cycle (%)
80
Inrush Current
VEN=2V,VIN=1.5V,VOUT =3.3V
IOUT =41mA,CFF =10nF
VEN
2V/div.
VOUT
50mV/div.
VOUT
2V/div.
VOUT
0.1V/div.
IIN
0.2A/div.
IOUT
50mA/div.
200 s/div.
MP3115 Rev. 0.9
4/12/2016
2.44
1700
VIN=1.2V to 2V,VOUT=2.5V, IOUT=48mA
VEN=VIN,Resistor Load
VIN
1V/div.
2.48
IPEAK vs. Duty Cycle
1.0
IOUT=100mA
13
16
19
22
INPUT VOLTAGE (V)
2.52
Minimum Start
VIN vs. IOUT
Line Regulation
10
2.56
2.40
0
100
1000
LOAD CURRENT (mA)
PEAK CURRENT (mA)
65
2.60
OUTPUT VOLTAGE (V)
95
EFFICIENCY(%)
EFFICIENCY(%)
C1 = 10µF, C2=22µF, L=1.7µH,R2=20K, TA = +25ºC, unless otherwise noted.
Efficiency vs.
Efficiency vs.
Load Regulation
Load Current
Load Current
40 s/div.
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1ms/div.
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
0.5V/div.
VIN
0.5V/div.
VSW
2V/div.
VSW
2V/div.
VOUT
2V/div
VOUT
2V/div
VEN
2V/div.
VIN
1V/div.
VSW
2V/div.
VOUT
2V/div
IL
1A/div.
VEN
2V/div.
1ms/div
10ms/div
Short Circuit
Short Circuit Recovery
VIN=VEN=2V, VOUT=3.3V
VIN=VEN=2V, VOUT=3.3V
VIN
2V/div.
VIN
2V/div.
VSW
2V/div.
VSW
2V/div.
VO
5V/div.
VOUT
5V/div
IL
0.2A/div.
IL
0.2A/div.
20ms/div.
VIN
1V/div.
VSW
2V/div.
VOUT
2V/div
IL
1A/div.
20ms/div.
No Load Ripple
Full Load Ripple
VIN=VEN=0.92V, VOUT=3.3V
IOUT=0mA
VIN=VEN=0.95V, VOUT=3.3V
IOUT=150mA
VIN
1V/div.
VIN
1V/div.
VSW
2V/div.
VSW
2V/div.
VOUT
10mV/div
IL
1A/div.
MP3115 Rev. 0.9
4/12/2016
VOUT
50mV/div
IL
1A/div.
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© 2016 MPS. All Rights Reserved.
5
MP3115 – HIGH-EFFICIENCY 1.3MHz SYNCHRONOUS STEP-UP CONVERTER
OPERATION
IN
6
EN
4
5 OUT
STARTUP
SOFT-START
PROTECTION
OSC
1.3MHz
CONTROL
LOGIC
1 SW
BIAS
RAMP
+
FB
3
ERROR
AMPLIFIER
RSENSE
PWM
COMPARATOR
CURRENT
SENSE
AMPLIFIER
2 GND
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 currentmode regulation improves transient response
and control loop stability.
When the MP3115 is disabled (EN0.8V), 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.
MP3115 Rev. 0.9
4/12/2016
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.
The MP3115 has a temperature sensing circuit
to protect the part. The MP3115 turns off both
switches when the chip temperature reaches
150°C.
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© 2016 MPS. All Rights Reserved.
6
MP3115 – HIGH-EFFICIENCY 1.3MHz SYNCHRONOUS STEP-UP CONVERTER
APPLICATION INFORMATION
COMPONENT SELECTION
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 20kΩ for the low-side resistor (R2) of the
voltage divider. Determine the high-side resistor
(R1) by the equation:
R1 =
VOUT − VFB
⎛ VFB ⎞
⎜⎜
⎟⎟
⎝ R2 ⎠
Where VOUT is the output voltage, VFB is the
1.2V feedback voltage and R2=20kΩ.
Selecting the Input Capacitor
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.
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:
VRIPPLE =
ILOAD (VO UT − VIN )
VO UT × C2 × f SW
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
Selecting the Inductor
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.
Calculate the required inductance value L using
the equations:
L=
VIN (VOUT - VIN )
VOUT × fSW × ΔI
IIN(MAX ) =
VOUT × ILOAD (MAX )
VIN × η
ΔI = (30% − 50%)IIN(MAX)
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 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.
LAYOUT CONSIDERATIONS
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.
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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
6
See Note 7
EXAMPLE
TOP MARK
4
AAAA
PIN 1
0.95
BSC
0.60
TYP
2.80
3.00
1
1.20
TYP
1.50
1.70
2.60
TYP
2.60
3.00
3
TOP VIEW
RECOMMENDED LAND PATTERN
0.90
1.30
1.45 MAX
0.09
0.20
SEATING PLANE
0.30
0.50
0.95 BSC
0.00
0.15
SEE DETAIL "A"
FRONT VIEW
SIDE VIEW
NOTE:
GAUGE PLANE
0.25 BSC
0o-8o
0.30
0.55
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH,
PROTRUSION OR GATE BURR.
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.
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
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© 2016 MPS. All Rights Reserved.
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