MP3410 [MPS]
1.3A, 550kHz Synchronous Rectified Step-up Converter;
| 型号： | MP3410 |
| 厂家： | 
MONOLITHIC POWER SYSTEMS |
| 描述： | 1.3A, 550kHz Synchronous Rectified Step-up Converter |
| 文件： | 总10页 (文件大小：377K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MP3410
1.3A, 550kHz Synchronous
Rectified Step-up Converter
The Future of Analog IC Technology
FEATURES
DESCRIPTION
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Over 90% Efficiency
The MP3410 is a highly efficient, synchronous,
fixed frequency, current-mode step-up converter
with output to input disconnect, inrush current
limiting and internal soft-start. It includes an error
amplifier, ramp generator, comparator, N-Channel
switch and P-Channel synchronous rectified
switch (which greatly improves efficiency). The
output disconnect feature allows the output to be
completely isolated from the input in shutdown
mode.
Output to Input Disconnect at Shutdown Mode
Internal Synchronous Rectifier
Inrush Current Limiting and Internal Soft-Start
Internal Compensation
1.3A Typical Switch Current Limit
550kHz Fixed Switching Frequency
Zero Current Shutdown Mode
Thermal Shutdown
5-Pin TSOT-23 Package
The 550kHz switching frequency allows for
APPLICATIONS
smaller external components producing
a
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MP3 Players
compact solution for a wide range of load currents.
The internal compensation and soft-start
minimizes the external component count and
limits the inrush current during startup. The
MP3410 has integrated power MOSFET which
can support up to 6V output and typical 1.3A
switch current.
Handheld Computers and PDAs
Digital Still and Video Cameras
External Modems
Small LCD Displays
For MPS green status, please visit MPS website under Quality Assurance.
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
The MP3410 is offered in a thin SOT23-5
package.
TYPICAL APPLICATION
Efficiency vs
Load Current
100
V
IN
1.8V - 3.2V
V
=3.6V
IN
90
80
70
60
50
40
30
4
SW
3
1
V
3.3V
400mA
OUT
FB
OUT
V
=2.4V
IN
5
EN
EN
MP3410
GND
2
V
=5V
OUT
10
100
LOAD CURRENT (mA)
1000
MP3410 Rev. 1.12
6/30/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
1
MP3410 — 1.3A, 550kHz SYNCHRONOUS RECTIFIED STEP-UP CONVERTER
ORDERING INFORMATION
Part Number*
Package
Top Marking
Free Air Temperature (TA)
TSOT23-5
MP3410DJ
P3
-40°C to +85°C
* For Tape & Reel, add suffix –Z (e.g. MP3410DJ–Z)
For RoHS compliant packaging, add suffix –LF (e.g. MP3410DJ–LF–Z)
PACKAGE REFERENCE
TOP VIEW
FB
GND
OUT
1
2
3
5
4
EN
SW
TSOT23-5
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance (4)
TSOT23-5..............................220.... 110.. °C/W
θJA
θJC
All Pins.........................................-0.3V to +6.5V
(2)
Continuous Power Dissipation (TA = +25°C)
........................................................... 0.47W
Storage Temperature............... -65°C to +150°C
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 .............................1.8V to 6V
Output Voltage VOUT...........................2.5V to 6V
Maximum Junction Temp. (TJ) .............. +125°C
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7 4-layer board.
MP3410 Rev. 1.12
6/30/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
2
MP3410 — 1.3A, 550kHz SYNCHRONOUS RECTIFIED STEP-UP CONVERTER
ELECTRICAL CHARACTERISTICS
VEN = VOUT = 3.3V, TA = +25°C, unless otherwise noted.
Parameter
Symbol Condition
Min
Typ
1.6
Max
Units
ILOAD = 0mA
VST
1.5
1.8
Startup Supply Voltage
V
R
LOAD = 50Ω
1.65
Output Voltage Range
Supply Current (Shutdown)
Supply Current
VOUT
2.5
6.0
0.5
V
μA
μA
V
VEN = VOUT =0V, VSW = 5V
VFB = 1.3V
0.15
360
1.19
50
Feedback Voltage
VFB
1.15
1.23
Feedback Input Current
Switching Frequency
Maximum Duty Cycle
EN Input Low Voltage
VFB = 1.19V
nA
KHz
%
fSW
410
80
550
90
690
95
DMAX
0.4
V
1.05
1.65
2.15
V
IN =1.8V
EN Input High Voltage
(see Chart EN high voltage vs
Input for details)
V
VIN =3.3V
VIN =5V
EN Pull Down Resistor
Low-Side On Resistance (5)
1
mΩ
mꢀ
A
RONLS VOUT = 3.3V
ILIM
300
1.3
530
160
30
Low-Side Current Limit
High-Side On Resistance (5)
Thermal Shutdown (5)
Thermal Shutdown Hysteresis (5)
RONHS VOUT = 3.3V
700
mꢀ
°C
°C
Note:
5) Guaranteed by design, not tested.
MP3410 Rev. 1.12
6/30/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
3
MP3410 — 1.3A, 550kHz SYNCHRONOUS RECTIFIED STEP-UP CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
Circuit on front page, VIN = 2.4V, VOUT = 3.3V, TA = +25°C, unless otherwise noted.
MP3410 Rev. 1.12
6/30/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
4
MP3410 — 1.3A, 550kHz SYNCHRONOUS RECTIFIED STEP-UP CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Circuit on front page, VIN = 2.4V, VOUT = 3.3V, TA = +25°C, unless otherwise noted.
PIN FUNCTIONS
Pin # Name Description
Regulation Feedback Input. Connect to an external resistive voltage divider from the output to
FB to set the output voltage.
1
FB
2
3
GND Ground.
OUT Supply Input for the MP3410. Connect to the output of the converter.
Output Switching Node. SW is the drain of the internal low-side N-Channel MOSFET and
high-side P-Channel MOSFET. Connect the inductor to SW to complete the step-up converter.
4
SW
Regulator On/Off Control Input. A logic high input turns on the regulator. A logic low input (VEN
< 0.4V) puts the MP3410 into low current shutdown mode. EN Input High Voltage will shift
5
EN
upward for a higher VIN. For a given VIN, as long as the voltage applied at EN pin is equal to or
higher than correspondent EN-High-min value specified in the EC table , the part can turn on
normally.
MP3410 Rev. 1.12
6/30/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
5
MP3410 — 1.3A, 550kHz SYNCHRONOUS RECTIFIED STEP-UP CONVERTER
OPERATION
UVLO
REFERENCE VOLTAGE
BIAS CURRENT
EN
THERMAL SHUTDOWN
OUT
OSC
500KHz
CONTROL
LOGIC
SW
RAMP
+
RS
CURRENT
GND
FB
SENSE
AMPLIFIER
PWM
COMPARATOR
1.2V
ERROR
AMPLIFIER
Figure 1—Functional Block Diagram
The MP3410 uses a 550kHz fixed-frequency,
current-mode regulation architecture to regulate
the output voltage. The MP3410 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 MP3410 is disabled (EN = Low), both
power switches are off. The body of the
P-Channel MOSFET connects to SW and there
is no current path from SW to OUT. Therefore,
the output voltage discharges to ground. When
the MP3410 is enabled (EN = High), the body of
the P-Channel MOSFET connects to OUT and
forms a forward diode from SW to OUT. Thus
the output voltage rises up toward the input
voltage. When output voltage crosses 1.6V the
MP3410 starts the controller and regulates the
output voltage to the target value.
Soft-Start
The MP3410 includes a soft-start timer that
limits the voltage at the error amplifier output
during startup to prevent excessive current at
the input. This prevents premature termination
of the source voltage at startup due to inrush
current. This also limits the inductor current at
startup, forcing the input current to rise slowly to
the amount required to regulate the output
voltage during soft-start.
MP3410 Rev. 1.12
6/30/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
6
MP3410 — 1.3A, 550kHz SYNCHRONOUS RECTIFIED 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 the current limit
variations).
Setting the Output Voltage
Set the output voltage by selecting the resistive
voltage divider ratio. The voltage divider drops
the output voltage to the 1.19V feedback
voltage. Use a 100kꢀ resistor for R2 of the
voltage divider. Determine the high-side resistor
R1 by the equation:
VOUT − VFB
R1=
V
⎛
⎞
FB
⎜
⎜
⎟
⎟
R2
Calculate the required inductance value L using
the equations:
⎝
⎠
Where VOUT is the output voltage, VFB is the
1.19V feedback voltage and R2=100kꢀ.
VIN × (VOUT - VIN )
L =
VOUT × fSW × ΔI
Selecting the Input Capacitor
VOUT ×ILOAD
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 the best choice as they have
extremely low ESR and are available in small
footprints. Use an input capacitor value of 4.7μF
or greater. This capacitor must be placed
physically close to the device.
(MAX)
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 efficiency. For the MP3410, typically, 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 heavy load transients
and extreme startup conditions.
Selecting the Output Capacitor
A single 4.7µF to 10µF ceramic capacitor
usually 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 the
capacitance, and so the output voltage ripple is
mostly independent of the ESR. The output
voltage ripple VRIPPLE is calculated as:
ILOAD
UT
VO − VIN
UT
VRIPPLE
=
VO × C2× fSW
Where VIN is the input voltage, ILOAD is the load
current, C2 is the capacitance of the output
capacitor and fSW is the 550kHz switching
frequency.
MP3410 Rev. 1.12
6/30/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
7
MP3410 — 1.3A, 550kHz SYNCHRONOUS RECTIFIED STEP-UP CONVERTER
Selecting the Feed-Forward Capacitor
LAYOUT CONSIDERATIONS
A feed-forward capacitor C3 in parallel with the
high-side resistor R1 can be added to improve
the output ripple at discontinuous conduction
mode and the load transient response (see
Figure 2). Up to 220pF for this capacitor is
recommended for 3.3V output applications.
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 MP3410 demo board layout
for reference.
Selecting the Schottky Diode
A Schottky diode D1 in parallel with the high-
side P-Channel MOSFET is necessary to clamp
the SW node to a safe level for outputs of 4V or
above. A 0.5A, 20V Schottky diode can be used
for this purpose. See Figure 3.
V
IN
1.8V - 3.2V
4
SW
3
1
V
3.3V
400mA
OUT
FB
OUT
C3
5
Up to 220pF
OPTIONAL
EN
EN
MP3410
GND
2
Figure 2—3.3V Typical Application Circuit with Feed-Forward Capacitor
4
SW
3
1
OUT
FB
5
EN
MP3410
GND
2
Figure 3—5V Typical Application Circuit with External Schottky Diode and Output Disconnect
Not Required
MP3410 Rev. 1.12
6/30/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
8
MP3410 — 1.3A, 550kHz SYNCHRONOUS RECTIFIED STEP-UP CONVERTER
D1
V
IN
2.5V - 4.2V
P1
4
SW
3
1
V
5V
400mA
OUT
FB
OUT
5
EN
EN
MP3410
GND
2
Figure 4—5V Typical Application Circuit with External Schottky Diode and Output Disconnect
Required
L1
C3
470pF
V
IN
2.5V-4.2V
4
SW
3
1
V
5V
400mA
OUT
FB
OUT
5
MP3410
EN
EN
GND
2
Figure 5—5V Typical Application Circuit
L1
4.7
B130
Vin
3V
4
C1
10
SW
3
OUT
Vout
3.8V
750mA
R1
220k
MP3410
C2
10
5
1
EN
EN
FB
R2
100 k
GND
2
Figure 6—3V-3.8V/750mA Application
MP3410 Rev. 1.12
6/30/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
9
MP3410 — 1.3A, 550kHz SYNCHRONOUS RECTIFIED STEP-UP CONVERTER
PACKAGE INFORMATION
TSOT23-5
0.95
BSC
0.60
TYP
2.80
3.00
5
4
1.20
TYP
1.50
1.70
2.60
TYP
2.60
3.00
1
3
TOP VIEW
RECOMMENDED LAND PATTERN
0.84
0.90
1.00 MAX
SEATING PLANE
0.09
0.20
0.30
0.50
0.00
0.10
0.95 BSC
SEE DETAIL "A"
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.
0.30
0.50
4) LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING)
SHALL BE 0.10 MILLIMETERS MAX.
0o-8o
5) DRAWING CONFORMS TO JEDEC MO-193, VARIATION AA.
6) DRAWING IS NOT TO SCALE.
DETAIL A
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.
MP3410 Rev. 1.12
6/30/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
10
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