D312C [MPS]
1.7MHz, 600mA Synchronous Step-Down Converter; 为1.7MHz ， 600mA同步降压转换器
| 型号： | D312C |
| 厂家： | 
MONOLITHIC POWER SYSTEMS |
| 描述： | 1.7MHz, 600mA Synchronous Step-Down Converter |
| 文件： | 总10页 (文件大小：445K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TM
MP2104
1.7MHz, 600mA Synchronous
Step-Down Converter
TM
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP2104 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
1.5V and 1.8V Fixed Output Versions
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 MP2104 can supply
600mA of load current from a 2.5V to 6V input
voltage. The output voltage for the MP2104DJ
can be regulated as low as 0.6V, while the output
voltages
of
the
MP2104DJ-1.5
and
MP2104DJ-1.8 are fixed at 1.5V and 1.8V,
respectively. The MP2104 can also run at 100%
duty cycle for low dropout applications.
APPLICATIONS
The MP2104 is available in a low profile (1mm)
5-pin, TSOT package.
•
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Cellular and Smart Phones
Microprocessors and DSP Core Supplies
PDAs
MP3 Players
Digital Still and Video Cameras
Portable Instruments
ORDERING INFORMATION
Part Number
MP2104DJ-1.5
MP2104DJ-1.8
MP2104DJ
Output Voltage
VOUT = 1.5V
VOUT = 1.8V
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
VOUT = 0.6V to 6V
EVALUATION BOARD REFERENCE
Board Number
Dimensions
EV2104DJ-00A
2.0”X x 2.0”Y x 0.5”Z
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
3
5
INPUT
IN
SW
2.5V - 6V
= 4.2V
IN
MP2104DJ-1.8
1
EN
OUT
OFF ON
GND
2
MP2104_TAC_S01
10
100
LOAD CURRENT (mA)
1000
MP2104-EC01
MP2104 Rev. 1.3
10/4/2005
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1
TM
MP2104 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
PACKAGE REFERENCE
TOP VIEW
TOP VIEW
EN
GND
SW
1
2
3
5
FB
IN
EN
GND
SW
1
2
3
5
4
OUT
IN
4
MP2104_PD01-TSOT23-5
MP2104_PD02-TSOT23-5
Part Number** Package
Marking
D7YW
Temp
Part Number*
Package
TSOT23-5
Temperature
MP2104DJ-1.5
MP2104DJ-1.8
TSOT23-5
TSOT23-5
–40°C to
+85°C
MP2104DJ
–40°C to +85°C
D8YW
** For Tape & Reel, add suffix –Z (eg. MP2104DJ-1.5–Z)
For Tape & Reel, add suffix –Z (eg. MP2104DJ–Z)
For Lead Free, add suffix –LF (eg. MP2104DJ–LF–Z)
*
For Lead Free, add suffix –LF (eg. MP2104DJ-1.5–LF–Z)
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
ABSOLUTE MAXIMUM RATINGS (1)
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
Thermal Resistance (4)
θJA
θJC
TSOT23-5..............................220.... 110.. °C/W
(2)
Lead Temperature ..............................+260°C
Notes:
Storage Temperature ............. –65°C to +150°C
1) Exceeding these ratings may damage the device.
2) For recommended IR reflow temperature information, refer to
MPS document MP2104_IRRTP.
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on approximately 1” square of 1 oz copper.
ELECTRICAL CHARACTERISTICS (5)
VIN = VEN = 3.6V, TA = +25°C, unless otherwise noted.
Parameter
Symbol Condition
VEN = VIN, VFB = 0.65V
Min
Typ
400
0.01
Max
600
1
Units
µA
Supply Current
Shutdown Current
VEN = 0V, VIN = 6V
µA
IN Under Voltage Lockout
Threshold
Rising Edge
2.10
2.27
55
2.45
V
IN Under Voltage Lockout
Hysteresis
mV
TA = +25°C, MP2104DJ
–40°C ≤ TA ≤ +85°C
0.588
0.582
–50
0.600
0.600
0.5
0.612
0.618
+50
Regulated FB Voltage
FB Input Bias Current
V
VFB = 0.65V, MP2104DJ
nA
MP2104 Rev. 1.3
10/4/2005
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TM
MP2104 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
(5)
ELECTRICAL CHARACTERISTICS (continued)
VIN = VEN = 3.6V, TA = +25°C, unless otherwise noted.
Parameter
Symbol Condition
Min
Typ
Max
Units
MP2104DJ-1.5
IOUT = 50mA
1.455
1.500
1.545
–40°C ≤ TA ≤ +85°C
Regulated Output Voltage
V
MP2104DJ-1.8
I
OUT = 50mA
1.746
–1
1.800
1.854
–40°C ≤ TA ≤ +85°C
PFET On Resistance
NFET On Resistance
ISW = 100mA
0.44
0.29
Ω
Ω
ISW = –100mA
V
EN = 0V, VIN = 6V
SW Leakage Current
+1
µA
VSW = 0V or 6V
Duty Cycle = 100%,
Current Pulse Width < 1ms
PFET Current Limit
Oscillator Frequency
0.7
1.0
1.70
145
0.96
1.35
2.08
A
1.26
MHz
°C
Thermal Shutdown Trip
Threshold
EN Trip Threshold
EN Input Current
Notes:
–40°C ≤ TA ≤ +85°C
0.3
–1
1.5
+1
V
VEN = 0V to 6V
µA
5) 100% production test at +25°C. Typical and temperature specifications are guaranteed by design and characterization.
MP2104 Rev. 1.3
10/4/2005
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TM
MP2104 – 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
10
100
LOAD CURRENT (mA)
1000
10
100
LOAD CURRENT (mA)
1000
LOAD CURRENT (mA)
MP2104-TPC05
MP2104-TPC01
MP2104-TPC02
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
LOAD CURRENT (mA)
1000
2
3
4
5
6
SUPPLY VOLTAGE (V)
MP2104-TPC03
MP2104-TPC04
MP2104-TPC06
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
TEMPERATURE (°C)
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
MP2104-TPC07
MP2104-TPC08
MP2104-TPC09
MP2104 Rev. 1.3
10/4/2005
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TM
MP2104 – 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.
MP2104 Rev. 1.3
10/4/2005
www.MonolithicPower.com
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© 2005 MPS. All Rights Reserved.
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TM
MP2104 – 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 MP2104. 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 (MP2104DJ). Connect FB to the center point of the external resistor divider. The
feedback threshold voltage is 0.6V.
5
5
FB
Output Voltage Sense Input (MP2104DJ-1.5 and MP2104DJ-1.8). An internal resistor divider is
connected to this pin to set the proper output voltage.
OUT
OPERATION
The MP2104 is a constant frequency current
mode PWM step-down converter. The MP2104
is optimized for low voltage, Li-Ion battery
powered applications where high efficiency and
small size are critical. The MP2104 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 MP2104 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
MP2104_BD01
Figure 1—Functional Block Diagram (MP2104)
MP2104 Rev. 1.3
10/4/2005
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TM
MP2104 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
IN
+
BIAS
&
IAMP
10X
EN
VOLTAGE
REFERENCE
--
CURRENT
SENSE
AMP
ICS
0.6V
+
PWM
DH
SLOPE COMP
EAO
+
FEEDBACK
ERROR EAMP
AMP
+
--
PWMCMP
MAIN
SWITCH
(PCH)
OUT
--
PWM
CONTROL
LOGIC
SW
CC
17pF
OSC
SYNCHRONOUS
RECTIFIER
(NCH)
1.7MHz
OSCILLATOR
DL
GND
MP2104_BD01
Figure 2—Functional Block Diagram (MP2104DJ-1.5 / MP2104DJ-1.8)
Current Mode PWM Control
the PFET current limit. The output voltage then is
the input voltage minus the voltage drop across
the main switch and the inductor.
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 MP2104 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.
Short Circuit Protection
The MP2104 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 MP2104 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 MP2104 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
MP2104 Rev. 1.3
10/4/2005
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TM
MP2104 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
APPLICATION INFORMATION
Output Voltage Setting (MP2104DJ)
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
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 × ∆IL × fOSC
Table 1—Resistor Selection vs. Output
Voltage Setting
Where ∆IL 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%)
∆IL
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)
IRMS (A)
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
0.9
0.8
0.5
0.7
Sumida
Sumida
Sumida
CR54-100
1.4
MP2104 Rev. 1.3
10/4/2005
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TM
MP2104 – 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 3 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 ∆VOUT is approximately:
⎛
⎜
⎝
⎞
⎟
⎟
⎠
VOUT
×
(
V
− VOUT
)
1
IN
⎜
Figure 3—MP2104 Suggested Layout
∆VOUT
≤
× ESR +
V × fOSC × L
8 × fOSC × C3
IN
For the fixed output versions (MP2104DJ-1.5
and MP2104-1.8), R1 is shorted and R2 is
open.
Efficiency vs
Load Current
100
V
= 3.3V
V
IN
90
80
70
60
50
40
30
20
10
0
OUTPUT
1.8V
600mA
4
3
5
INPUT
IN
SW
2.5V - 6V
= 4.2V
IN
MP2104
1
EN
FB
OFF ON
GND
2
MP2104_F04
10
100
LOAD CURRENT (mA)
1000
MP2104-EC02
Figure 4—VIN = 2.5V to 6V, VOUT = 1.8V, ILOAD = 600mA Step-Down Circuit
(L = 10µH for Higher Light-Load Efficiency)
NOTICE: MPS believes the information in this document to be accurate and reliable. However, it is subject to change without
notice. Contact MPS for current specifications. MPS encourages users of its products to ensure that third party Intellectual
Property rights are not infringed upon when integrating MPS products into any application. MPS cannot assume any legal
responsibility for any said applications.
MP2104 Rev. 1.0
10/4/05
© 2004 MPS, Inc.
Monolithic Power Systems, Inc.
983 University Avenue, Building A, Los Gatos, CA 95032 USA
Tel: 408-357-6600 ♦ Fax: 408-357-6601 ♦ www.MonolithicPower.com
9
TM
MP2104 – 1.7MHz 600mA SYNCHRONOUS STEP-DOWN CONVERTER
PACKAGE INFORMATION
TSOT23-5
3
2.90 BSC
0.950
TYP
.
0.950
TYP
.
10°TYP.
(2 plcs)
C
L
+
-
4°
0°
0°
±0.10
0.400
0.25 BSC.
Gauge Plane
0.300(Min)
C
0.500(Max)
(5
L
PLCS)
SEATING PLANE
0.127 TYP.
0.00-0.10
10° TYP.
(2 plcs)
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.
MP2104 Rev. 1.3
10/4/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
10
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SI9137LG
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SI9122E
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