概述
数据手册MP28112DJ-LF 概述
暂无描述
MP28112DJ-LF 数据手册
通过下载MP28112DJ-LF数据手册来全面了解它。这个PDF文档包含了所有必要的细节，如产品概述、功能特性、引脚定义、引脚排列图等信息。
PDF下载MP28112
1.7MHz, 600mA Synchronous
Step-Down Converter
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP28112 is a 1.7MHz constant frequency,
current mode, PWM step-down converter. The
•
•
•
•
•
•
•
•
•
•
•
High Efficiency: Up to 95%
1.7MHz Constant Switching Frequency
600mA 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 Package
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 MP28112 can
supply 600mA of load current from a 2.5V to 6V
input voltage. The output voltage for the
MP28112DJ can be regulated as low as 0.6V.
The MP28112 can also run at 100% duty cycle for
low dropout applications.
APPLICATIONS
The MP28112 is available in a low profile (1mm)
5-pin, TSOT package.
•
•
•
•
•
•
Cellular and Smart Phones
Microprocessors and DSP Core Supplies
PDAs
MP3 Players
Digital Still and Video Cameras
Portable Instruments
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
Efficiency vs
Load Current
100
V
= 3.3V
V
IN
OUTPUT
1.8V
600mA
90
80
70
60
50
40
30
20
10
0
4
1
3
5
INPUT
IN
SW
FB
2.5V - 6V
= 4.2V
IN
MP28112
EN
OFF ON
GND
2
10
100
LOAD CURRENT (mA)
1000
MP28112 Rev. 1.0
12/12/2007
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
1
MP28112 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
ABSOLUTE MAXIMUM RATINGS (1)
PACKAGE REFERENCE
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
SW Peak Current........................................ 1.4A
Junction Temperature.............................+150°C
Lead Temperature (2) ..............................+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 Temperature .............–40°C to +85°C
TOP VIEW
EN
GND
SW
1
2
3
5
4
FB
IN
Thermal Resistance (4)
θJA
θJC
TSOT23-5..............................220.... 110.. °C/W
Notes:
Part Number*
MP28112DJ
Package
Temperature
–40°C to +85°C
1) Exceeding these ratings may damage the device.
2) For recommended IR reflow temperature information, refer to
MPS document MP28112_IRRTP.
TSOT23-5
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on approximately 1” square of 1 oz copper.
For Tape & Reel, add suffix –Z (eg. MP28112DJ–Z)
For RoHS Compliant Packaging, add suffix –LF (eg.
MP28112DJ–LF–Z)
*
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
400
0.01
Max
600
1
Units
μA
μA
VEN = 0V, VIN = 6V
IN Under Voltage Lockout
Threshold
IN Under Voltage Lockout
Hysteresis
Rising Edge
2.10
2.27
55
2.45
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
0.44
0.29
0.612
0.618
+50
Regulated FB Voltage
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:
0.7
1.0
1.70
145
0.96
1.35
2.08
A
1.26
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. Typical and temperature specifications are guaranteed by design and characterization.
MP28112 Rev. 1.0
12/12/2007
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
2
MP28112 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 3.3V, VOUT = 1.8V, L1 = 10μH, C1 = 4.7μF, C3 = 10μF, TA = +25°C, unless otherwise noted.
Output Voltage vs
Load Current
Efficiency vs
Load Current
Efficiency vs
Load Current
1.85
1.83
1.81
1.79
1.77
1.75
1.73
1.71
1.69
1.67
1.65
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
V
= 3.3V
IN
V
= 3.3V
IN
V
= 4.2V
IN
V
= 4.2V
IN
V
= 3.3V
IN
0
100 200 300 400 500 600 700 800 900
LOAD CURRENT (mA)
10
100
LOAD CURRENT (mA)
1000
10
100
LOAD CURRENT (mA)
1000
Efficiency vs
Load Current
Efficiency vs
Load Current
Output Voltage vs
Supply Voltage
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
1.810
1.808
1.806
1.804
1.802
1.800
V
V
= 1.8V
V
V
= 1.8V
OUT
= 3.3V
OUT
= 4.2V
IN
I
= 200mA
IN
LOAD
10
100
LOAD CURRENT (mA)
1000
10
100
1000
2
3
4
5
6
LOAD CURRENT (mA)
SUPPLY VOLTAGE (V)
Regulated FB Voltage vs
Temperature
PFET Current Limit vs
Temperature
Oscillator Frequency vs
Supply Voltage
0.620
0.615
0.610
0.605
0.600
0.595
0.590
0.585
0.580
1.3
1.2
1.1
1.0
0.9
0.8
0.7
2.05
1.95
1.85
1.75
1.65
1.55
1.45
1.35
1.25
-50 -30 -10 10 30 40 70 90 110130
-50 -30 -10 10 30 40 70 90 110130
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
MP28112 Rev. 1.0
12/12/2007
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
3
MP28112 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 3.3V, VOUT = 1.8V, L1 = 10μH, C1 = 4.7μF, C3 = 10μF, TA = +25°C, unless otherwise noted.
Load Transient
Light Load Operation Heavy Load Operation
IN
V
= 3.3V, V
= 1.8V,
= 0 - 500mA Step
V
= 3.3V, V
OUT
= 1.8V,
V
IN
= 3.3V, V = 1.8V,
OUT
IN
OUT
I
I
= 0A
I
= 600mA
LOAD
LOAD
LOAD
V
Ripple
V
Ripple
OUT
OUT
10mV/div
10mV/div
V
Ripple
OUT
100mV/div
I
L
I
0.2A/div
L
0.2A/div
I
L
0.5A/div
V
V
SW
SW
2V/div
2V/div
Startup from Shutdown
Startup from Shutdown
Startup from Shutdown
V
= 2.5V, V
= 1.8V,
V
= 3.3V, V
= 1.8V,
V
= 5V, V
= 1.8V,
IN
OUT
IN
OUT
IN
OUT
I
= 600mA Resistive
I
= 600mA Resistive
I
LOAD
= 600mA Resistive
LOAD
LOAD
V
V
V
EN
EN
EN
5V/div
5V/div
5V/div
V
V
V
OUT
OUT
OUT
1V/div
1V/div
1V/div
I
I
I
L
L
L
0.5A/div
0.5A/div
0.5A/div
Short Circuit Protection
Short Circuit Recovery
V
= 3.3V, V
= 1.8V,
V
= 3.3V, V = 1.8V,
IN
No Load
OUT
IN
No Load
OUT
V
V
OUT
OUT
1V/div
1V/div
I
I
L
L
0.5A/div
0.5A/div
MP28112 Rev. 1.0
12/12/2007
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
4
MP28112 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
PIN FUNCTIONS
Pin # Name Description
Regulator Enable Control Input. Drive EN above 1.5V to turn on the MP28112. Drive EN below
0.3V to turn it off (shutdown current < 0.1μA).
1
EN
2
3
4
GND Ground.
SW Power Switch Output. Inductor connection to drains of the internal PFET and NFET switches.
IN
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.
5
FB
OPERATION
The MP28112 is a constant frequency current
mode PWM step-down converter. The
MP28112 is optimized for low voltage, Li-Ion
battery powered applications where high
efficiency and small size are critical. The
MP28112 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 MP28112 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, fOSC is
the oscillator frequency (1.7MHz), VOUT is the
output voltage and VIN is the input voltage.
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)
1.7MHz
OSCILLATOR
DL
GND
Figure 1—Functional Block Diagram
MP28112 Rev. 1.0
12/12/2007
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
5
MP28112 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
Current Mode PWM Control
Short Circuit Protection
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 MP28112 switches at a
constant frequency (1.7MHz) 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 MP28112 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 MP28112 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 decreases.
Dropout Operation
The MP28112 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 the PFET current limit. The output voltage then
is the input voltage minus the voltage drop across
the main switch and the inductor.
MP28112 Rev. 1.0
12/12/2007
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
6
MP28112 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
APPLICATION INFORMATION
Output Voltage Setting
Inductor Selection
The external resistor divider sets the output
voltage. 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
Choose R1 around 300kΩ for optimal transient
response. R2 is then given by:
recommended inductors and manufacturers.
For most designs, the inductance value can be
derived from the following equation:
R1
R2 =
VOUT
VOUT
×
(
VIN − VOUT
)
−1
L =
0.6V
VIN × ΔIL × fOSC
Table 1—Resistor Selection vs. Output
Voltage Setting
Where ΔIL is the inductor ripple current. Choose
inductor ripple current approximately 30% of the
maximum load current, 600mA.
VOUT
1.2V
1.5V
1.8V
2.5V
R1
R2
The maximum inductor peak current is:
300kΩ (1%)
300kΩ (1%)
300kΩ (1%)
300kΩ (1%)
300kΩ (1%)
200kΩ (1%)
150kΩ (1%)
95.3kΩ (1%)
ΔIL
2
IL(MAX) = ILOAD
+
Under light load conditions below 100mA, larger
inductance is recommended for improved
efficiency. Table 3 lists inductors recommended
for this purpose.
Table 2—Suggested Surface Mount Inductors
Saturation
Current (A)
Dimensions
Manufacturer
Coilcraft
Toko
Sumida
Taiyo Yuden
Part Number
LP1704-222M
D312C
CDRH3D16
LBC2518
Inductance (μH) Max DCR (Ω)
LxWxH (mm3)
2.2
2.2
2.2
2.2
0.07
0.14
0.072
0.13
1.7
1.0
1.2
0.6
6.5x5.3x2
3.6x3.6x1
4x4x1.8
2.5x1.8x1.8
Table 3—Inductors for Improved Efficiency at 25mA, 50mA, under 100mA Load.
Saturation
Manufacturer
Coilcraft
Murata
Part Number
DO1605T-103MX
LQH4C100K04
CMD4D06-100
CR32-100
Inductance (μH) Max DCR (Ω)
Current (A)
I
RMS (A)
0.9
0.8
0.5
0.7
1.4
10
10
10
10
10
0.3
0.2
0.3
0.2
0.1
1.0
1.2
0.7
1.0
1.2
Sumida
Sumida
Sumida
CR54-100
MP28112 Rev. 1.0
12/12/2007
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
7
MP28112 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
PC Board Layout
Input 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 high current paths (GND, IN and SW)
should be placed very close to the device with
short, direct and wide traces. Input capacitor C1
needs to be as close as possible to the IN and
GND pins. The external feedback resistors shall
be placed next to the FB pin. Keep the
switching node SW short and away from the
feedback network. Figure 2 illustrates an
example of PCB layout and signal routing.
Output Capacitor Selection
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
⎜
Figure 2—MP28112 Suggested Layout
ΔVOUT
≤
× ESR +
V × fOSC × L
8 × fOSC × C3
IN
MP28112 Rev. 1.0
12/12/2007
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
8
MP28112 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN 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.
MP28112 Rev. 1.0
12/12/2007
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
9
MP28112DJ-LF 相关器件
| 型号 | 制造商 | 描述 | 价格 | 文档 |
| MP28112DJ-LF-Z | MPS | Switching Regulator, Current-mode, 1.4A, 2080kHz Switching Freq-Max, PDSO5, 1 MM, ROHS COMPLIANT, MO-193AA, TSOT23, 5 PIN | 获取价格 |
|
| MP28112DJ-Z | MPS | Switching Regulator, Current-mode, 1.4A, 2080kHz Switching Freq-Max, PDSO5, 1 MM, MO-193AA, TSOT23, 5 PIN | 获取价格 |
|
| MP28114 | MPS | Ultra-small 1.7MHz, 600mA, Low-Voltage Synchronous Step-Down Converter | 获取价格 |
|
| MP28114DG | MPS | Switching Regulator, Current-mode, 1.4A, 2080kHz Switching Freq-Max, PDSO8, 2 X 2 MM, MO-229VCCD-3, QFN-8 | 获取价格 |
|
| MP28114DG-1.5 | MPS | Ultra-small 1.7MHz, 600mA, Low-Voltage Synchronous Step-Down Converter | 获取价格 |
|
| MP28114DG-1.5-LF-Z | MPS | Switching Regulator/Controller, | 获取价格 |
|
| MP28114DG-1.5-Z | MPS | Switching Regulator/Controller, | 获取价格 |
|
| MP28114DG-1.8 | MPS | Switching Regulator, Current-mode, 1.4A, 2080kHz Switching Freq-Max, PDSO8, 2 X 2 MM, MO-229VCCD-3, QFN-8 | 获取价格 |
|
| MP28114DG-1.8-LF-Z | MPS | Switching Regulator/Controller, | 获取价格 |
|
| MP28114DG-1.8-Z | MPS | Switching Regulator/Controller, | 获取价格 |
|
MP28112DJ-LF 相关文章
Bourns 密封通孔金属陶瓷微调电位计产品选型手册(英文版)
- 2024-09-20
- 6
Bourns 精密环境传感器产品选型手册(英文版)
- 2024-09-20
- 9
Bourns POWrTher 负温度系数(NTC)热敏电阻手册 (英文版)
- 2024-09-20
- 8
Bourns GMOV 混合过压保护组件产品选型手册(英文版)
- 2024-09-20
- 6
