MP2105DK-LF [MPS]
Switching Regulator, Current-mode, 1300kHz Switching Freq-Max, PDSO10, ROHS COMPLIANT, MO-817BA, MSOP-10;
| 型号： | MP2105DK-LF |
| 厂家： | 
MONOLITHIC POWER SYSTEMS |
| 描述： | Switching Regulator, Current-mode, 1300kHz Switching Freq-Max, PDSO10, ROHS COMPLIANT, MO-817BA, MSOP-10 开关 光电二极管 |
| 文件： | 总13页 (文件大小：278K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MP2105
1MHz, 800mA Synchronous
Step-Down Converter
The Future of Analog IC Technology
DESCRIPTION
FEATURES
•
•
•
•
•
•
•
•
•
•
•
High Efficiency: Up to 95%
1MHz Constant Switching Frequency
800mA Available Load Current
2.5V to 6V Input Voltage Range
Output Voltage as Low as 0.6V
100% Duty Cycle in Dropout
Current Mode Control
Short Circuit Protection
Thermal Fault Protection
<0.1μA Shutdown Current
Space Saving 5-Pin TSOT23 and 10-pin
MSOP Packages
The MP2105 is a 1MHz constant frequency,
current mode, PWM step-down converter. The
device integrates a main switch and a
synchronous rectifier for high efficiency without
an external Schottky diode. It is ideal for
powering portable equipment that runs from a
single cell Lithium-Ion (Li+) battery. The
MP2105 can supply 800mA of load current from
a 2.5V to 6V input voltage. The output voltage
can be regulated as low as 0.6V. The MP2105
can also run at 100% duty cycle for low dropout
applications.
The MP2105 is available in a low profile (1mm)
5-pin, TSOT and 10-pin, MSOP packages.
APPLICATIONS
•
•
•
•
•
•
Cellular and Smart Phones
Microprocessors and DSP Core Supplies
PDAs
MP3 Players
Digital Still and Video Cameras
Portable Instruments
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
Efficiency vs
Load Current
100
OUTPUT
4
1
V
= 3.3V
3
5
IN
INPUT
90
80
70
60
50
40
30
20
10
0
IN
SW
FB
1.8V
2.5V to 6V
800mA
V
= 4.2V
MP2105
IN
EN
OFF ON
GND
2
MP2105_TAC_S01
10
100
LOAD CURRENT (mA)
1000
MP2105-EC01
MP2105 Rev. 1.51
10/25/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
1
MP2105 – 1MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER
ORDERING INFORMATION
Part Number
MP2105DJ*
MP2105DK**
Package
TSOT23-5
MSOP10
Top Marking
Free Air Temperature (TA)
–40°C to +85°C
C5
2105D
–40°C to +85°C
* For Tape & Reel, add suffix –Z (g. MP2105DJ–Z).
For RoHS compliant packaging, add suffix –LF (e.g. MP2105DJ–LF–Z)
** For Tape & Reel, add suffix –Z (g. MP2105DK–Z).
For RoHS compliant packaging, add suffix –LF (e.g. MP2105DK–LF–Z)
PACKAGE REFERENCE
TOP VIEW
EN
GND
SW
1
2
3
5
4
FB
IN
TSOT23-5
MSOP10
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance (4)
TSOT23-5..............................220.... 110.. °C/W
MSOP10................................150..... 65... °C/W
θJA
θJC
VIN to GND ..................................–0.3V to +6.5V
VSW to GND........................... –0.3V to VIN +0.3V
VFB, VEN to GND..........................–0.3V to +6.5V
(2)
Notes:
Continuous Power Dissipation (TA = +25°C)
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.
TSOT23-5………………………………....0.56W
MSOP10…………………………………....0.83W
Junction Temperature.............................+150°C
Lead Temperature ..................................+260°C
Storage Temperature ............. –65°C to +150°C
Recommended Operating Conditions (3)
Supply Voltage VIN .............................2.5V to 6V
Output Voltage VOUT...........................0.6V to 6V
Operating Junct. Temp. ........... -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.
MP2105 Rev. 1.51
10/25/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
2
MP2105 – 1MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS (5)
VIN = VEN = 3.6V, TA = +25°C, unless otherwise noted.
Parameter
Supply Current
Shutdown Current
Symbol Condition
VEN = VIN, VFB = 0.65V
Min
Typ
440
0.10
Max
600
1
Units
μA
μA
VEN = 0V, VIN = 6V
IN Undervoltage Lockout
Threshold
IN Undervoltage Lockout
Hysteresis
Rising Edge
2.15
2.30
55
2.40
V
mV
V
TA = +25°C
–40°C ≤ TA ≤ +85°C
VFB = 0.65V
ISW = 100mA
ISW = –100mA
0.588
0.582
–50
0.600
0.600
0.5
0.42
0.26
0.612
0.618
+50
Regulated FB Voltage
VFB
FB Input Bias Current
PFET On Resistance
NFET On Resistance
nA
Ω
Ω
V
V
EN = 0V, VIN = 6V,
SW = 0V or 6V
SW Leakage Current
–1
+1
μA
Duty Cycle = 100%,
Current Pulse Width < 1ms
PFET Current Limit
Oscillator Frequency
Thermal Shutdown Trip
Threshold
EN Trip Threshold
EN Input Current
Notes:
1.2
1.6
1.05
145
0.96
A
fOSC
0.85
1.3
MHz
°C
–40°C ≤ TA ≤ +85°C
VEN = 0V to 6V
0.3
–1
1.5
+1
V
μA
5) 100% production test at +25°C. Specifications over the temperature range are guaranteed by design and characterization.
MP2105 Rev. 1.51
10/25/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
3
MP2105 – 1MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER
PIN FUNCTIONS
MSOP
Pin #
TSOT
Pin #
Name
Description
Regulator Enable Control Input. Drive EN above 1.5V to turn on the MP2105.
Drive EN below 0.3V to turn it off (shutdown current < 0.1μA).
8
3
9
1
5
1
2
3
4
5
EN
GND
SW
IN
Ground.
Power Switch Output. Inductor connection to drains of the internal PFET and
NFET switches.
Supply Input. Bypass to GND with a 2.2μF or greater ceramic capacitor.
Feedback Input. Connect FB to the center point of the external resistor divider.
The feedback threshold voltage is 0.6V.
FB
2, 4, 6, 7
10
NC
No Connect
PGND Power Ground
MP2105 Rev. 1.51
10/25/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
4
MP2105 – 1MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER
TYPCIAL PERFORMANCE CHARACTERISTICS
VIN = 3.3V, VOUT = 1.8V, L1 = 4.7μH, C1 = 4.7μF, C3 = 10μF, TA = +25°C, unless otherwise noted.
100
95
90
85
80
75
70
65
60
55
50
95
90
85
80
75
70
65
60
55
50
V
=3.3V
IN
V
=3.3V
IN
V
=4.2V
IN
V
=4.2V
IN
10
100
LOAD CURRENT (mA)
1000
10
100
LOAD CURRENT (mA)
1000
MP2105-EC01
MP2105-EC02
Switching Frequency vs
Temperature
Feedback Voltage vs
Temperature
1.10
1.08
1.06
1.04
1.02
1.00
0.98
0.96
0.94
0.603
0.602
0.601
0.600
0.599
0.598
0.597
-20
-20
-40
0
+20 +40 +60 +80 +100
-40
0
+20 +40 +60 +80 +100
TEMPERATURE (°C)
TEMPERATURE (°C)
MP2105-TPC01
MP2105-TPC02
Load Transient
Light Load Operation
(I
=0mA to 500mA step)
(I
=0mA)
OUT
OUT
V
OUT
10mV/div.
V
OUT
100mV/div.
I
L
0.2A/div.
I
OUT
0.5A/div.
SW
2V/div.
MP2105-TPC03
MP2105-TPC04
MP2105 Rev. 1.51
10/25/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
5
MP2105 – 1MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER
TYPCIAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 3.3V, VOUT = 1.8V, L1 = 4.7μH, C1 = 4.7μF, C3 = 10μF, TA = +25°C, unless otherwise noted.
Heavy Load Operation
OUT
I
= 800mA
Startup from Shutdown
V
OUT
10mV/div.
V
EN
2V/div.
V
I
OUT
1V/div.
L
0.2A/div.
SW
I
L
2V/div.
0.5A/div.
I =0
L
MP2105-TPC07
MP2105-TPC08
Short Circuit Protection
(No Load)
Short Circuit Recovery
(No Load)
V
OUT
1V/div.
V
OUT
1V/div.
I
I
L
L
0.5A/div.
0.5A/div.
MP2105-TPC09
MP2105-TPC10
MP2105 Rev. 1.51
10/25/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
6
MP2105 – 1MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER
OPERATION
The MP2105 is a constant frequency current
mode PWM step-down converter. The MP2105
is optimized for low voltage, Li-Ion battery
powered applications where high efficiency and
small size are critical. The MP2105 uses an
external resistor divider to set the output
voltage from 0.6V to 6V. The device integrates
both a main switch and a synchronous rectifier,
which provides high efficiency and eliminates
an external Schottky diode. The MP2105 can
achieve 100% duty cycle. The duty cycle D of a
step-down converter is defined as:
VOUT
D = TON × fOSC ×100% ≈
×100%
VIN
where TON is the main switch on time, and fOSC
is the oscillator frequency (1MHz).
IN
+
BIAS
IAMP
10X
&
EN
VOLTAGE
REFERENCE
--
CURRENT
SENSE
AMP
ICS
0.6V
+
+
--
PWM
OSC
DH
SLOPE COMP
EAO
+
PWMCMP
FEEDBACK
MAIN
ERROR\ EAMP
SWITCH
(PCH)
AMP
FB
--
PWM
CONTROL
LOGIC
SW
CC
17pF
SYNCHRONOUS
RECTIFIER
(NCH)
1.0MHz
OSCILLATOR
DL
GND
MP2105_BD01
Figure 1—Function Block Diagram
MP2105 Rev. 1.51
10/25/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
7
MP2105 – 1MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER
Current Mode PWM Control
the PFET current limit. The output voltage then is
Slope compensated current mode PWM control
provides stable switching and cycle-by-cycle
current limit for superior load and line response
and protection of the internal main switch and
synchronous rectifier. The MP2105 switches at a
constant frequency (1MHz) and regulates the
output voltage. During each cycle the PWM
comparator modulates the power transferred to the
load by changing the inductor peak current based
on the feedback error voltage. During normal
operation, the main switch is turned on for a certain
time to ramp the inductor current at each rising
edge of the internal oscillator, and switched off
when the peak inductor current is above the error
voltage. When the main switch is off, the
synchronous rectifier will be turned on immediately
and stay on until either the next cycle starts.
the input voltage minus the voltage drop across
the main switch and the inductor.
Short Circuit Protection
The MP2105 has 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 reaches 0.6V.
Maximum Load Current
The MP2105 can operate down to 2.5V input
voltage; however the maximum load current
decreases at lower input due to 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 decrease
Dropout Operation
The MP2105 allows the main switch to remain on
for more than one switching cycle and increases
the duty cycle while 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
MP2105 Rev. 1.51
10/25/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
8
MP2105 – 1MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER
PPLICATION INFORMATION
Output Voltage Setting
Inductor Selection
The external resistor divider sets the output
voltage (see Figure 3). The feedback resistor R1
also sets the feedback loop bandwidth with the
internal compensation capacitor (see Figure 1).
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
<200mΩ. See Table 2 for recommended inductors
and manufacturers. For most designs, the inductance
value can be derived from the following equation:
Choose R1 around 500kΩ for optimal transient
response. R2 is then given by:
R1
R2 =
VOUT
×
(
VIN − VOUT
)
L =
VOUT
VIN × ΔIL × fOSC
−1
0.6V
where ΔIL is Inductor Ripple Current. Choose inductor
ripple current approximately 30% of the maximum
load current, 800mA.
Table 1—Resistor Selection vs. Output
Voltage Setting
The maximum inductor peak current is:
VOUT
1.2V
1.5V
1.8V
2.5V
R1
R2
ΔIL
2
499kΩ (1%)
499kΩ (1%)
499kΩ (1%)
499kΩ (1%)
499kΩ (1%)
332kΩ (1%)
249kΩ (1%)
158kΩ (1%)
IL(MAX) = ILOAD
+
Under light load conditions below 100mA, larger
inductance is recommended for improved efficiency.
Table 3 lists inductors recommended for this purpose.
MP2105 Rev. 1.51
10/25/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
9
MP2105 – 1MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER
Table 2—Suggested Surface Mount Inductors
Saturation
Current (A)
Dimensions
Manufacturer
Part Number
Inductance (μH) Max DCR (Ω)
L x W x H (mm3)
Coilcraft
Toko
Sumida
D01605T-472
D52LC
CR43-4R7
4.7
4.7
4.7
0.150
0.087
0.109
1.20
1.14
1.15
5.4 x 4.2 x 1.8
5 x 5 x 2
4.3 x 4.8 x 3.5
Table 3—Inductors for Improved Efficiency at 25mA, 50mA, under 100mA Load.
Saturation
Manufacturer
Part Number
Inductance (μH) Max DCR (Ω)
IRMS (A)
Current (A)
DO1605T-
103MX
Coilcraft
10
0.3
1.0
0.9
Murata
Sumida
Sumida
LQH4C100K04
CR32-100
10
10
10
0.2
0.2
0.1
1.2
1.0
1.2
0.8
0.7
1.4
CR54-100
Input Capacitor Selection
Output Capacitor Selection
The input capacitor reduces the surge current
drawn from the input and switching noise from
the device. The input capacitor impedance at
the switching frequency shall be less than input
source impedance to prevent high frequency
switching current passing to the input. Ceramic
capacitors with X5R or X7R dielectrics are
highly recommended because of their low ESR
and small temperature coefficients. For most
applications, a 4.7μF capacitor is sufficient.
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.
The output ripple ΔVOUT is approximately:
⎛
⎞
⎟
⎟
⎠
VOUT
×
V
− VOUT
)
1
IN
⎜
ΔVOUT
≤
× ESR +
⎜
⎝
V × fOSC × L
8 × fOSC × C3
IN
MP2105 Rev. 1.51
10/25/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
10
MP2105 – 1MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER
PCB layout guide
PCB layout is very important to achieve stable
operation. It is highly recommended to duplicate
EVB layout for optimum performance.
3) Ensure all feedback connections are short
and direct. Place the feedback resistors and
compensation components as close to the
chip as possible.
If change is necessary, please follow these
guidelines and take figure 2 for reference.
4) Route SW away from sensitive analog areas
such as FB.
1) Keep the path of switching current short and
minimize the loop area formed by Input cap,
high-side MOSFET and low-side MOSFET.
5) Connect IN, SW, and especially GND
respectively to a large copper area to cool
the chip to improve thermal performance and
long-term reliability.
2) Bypass ceramic capacitors are suggested to
be put close to the Vin Pin.
OUTPUT
3
4
INPUT
2.5V - 6V
IN
SW
1.8V
800mA
MP2105
5
1
EN
OUT
OFF ON
GND
2
Figure 2 —MP2105 Typical Application Circuit
R1
R3
R2
GND
1
2
3
5
FB
IN
EN
GND
SW
4
CIN
L1
COUT
VIN
GND
VOUT
Top Layer
Bottom Layer
Figure 3—MP2105 Suggested Layout (TQFN)
MP2105 Rev. 1.51
10/25/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
11
MP2105 – 1MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER
PACKAGE INFORMATION
TSOT23-5
MP2105 Rev. 1.51
10/25/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
12
MP2105 – 1MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER
MSOP10
0.114(2.90)
0.122(3.10)
6
10
0.187(4.75)
0.199(5.05)
0.114(2.90)
0.122(3.10)
PIN 1 ID
(NOTE 5)
5
1
0.007(0.18)
0.011(0.28)
0.0197(0.50)BSC
BOTTOM VIEW
TOP VIEW
GAUGE PLANE
0.010(0.25)
0.030(0.75)
0.037(0.95)
0.043(1.10)MAX
SEATING PLANE
0.002(0.05)
0.004(0.10)
0.008(0.20)
0.016(0.40)
0.026(0.65)
0o-6o
0.006(0.15)
FRONT VIEW
SIDE VIEW
NOTE:
1) CONTROL DIMENSION IS IN INCHES. DIMENSION IN BRACKET IS
IN MILLIMETERS.
2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH,
PROTRUSION OR GATE BURR.
0.181(4.60)
3) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD FLASH OR
PROTRUSION.
4) LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING)
SHALL BE 0.004" INCHES MAX.
5) PIN 1 IDENTIFICATION HAS THE HALF OR FULL CIRCLE OPTION.
6) DRAWING MEETS JEDEC MO-817, VARIATION BA.
7) DRAWING IS NOT TO SCALE.
0.040(1.00)
0.012(0.30)
0.0197(0.50)BSC
RECOMMENDED LAND PATTERN
NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.
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.
MP2105 Rev. 1.51
10/25/2011
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
13
相关型号：
MP2105DK-LF-Z
Switching Regulator, Current-mode, 1300kHz Switching Freq-Max, PDSO10, ROHS COMPLIANT, MO-817BA, MSOP-10
MPS
MP2106DQ-LF-Z
Switching Regulator, Current-mode, 3.2A, 900kHz Switching Freq-Max, PDSO10, QFN-10
MPS
©2020 ICPDF网 联系我们和版权申明