DO1605T-103MX [MPS]
Dual 1.2MHz, 800mA Synchronous Step-Down Converter; 双1.2MHz的， 800毫安同步降压型转换器
| 型号： | DO1605T-103MX |
| 厂家： | 
MONOLITHIC POWER SYSTEMS |
| 描述： | Dual 1.2MHz, 800mA Synchronous Step-Down Converter |
| 文件： | 总8页 (文件大小：294K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TM
MP2109
Dual 1.2MHz, 800mA Synchronous
Step-Down Converter
TM
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP2109 contains two independent 1.2MHz
constant frequency, current mode, PWM
•
•
•
•
•
•
•
•
•
•
•
•
Up to 95% Efficiency
1.2MHz Constant Switching Frequency
800mA Load Current on Each Channel
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
Internally Compensated
step-down
converters.
Each
converter
integrates a main switch and a synchronous
rectifier for high efficiency without an external
Schottky diode. The MP2109 is ideal for
powering portable equipment that runs from a
single cell Lithium-Ion (Li+) battery. Each
converter 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
MP2109 can also run at 100% duty cycle for
low dropout applications.
Space Saving 10-Pin QFN Package
APPLICATIONS
EVALUATION BOARD REFERENCE
•
•
•
•
•
•
Cellular and Smart Phones
Microprocessors and DSP Core Supplies
PDAs
MP3 Players
Digital Still and Video Cameras
Portable Instruments
Board Number
Dimensions
EV2109DQ-00A
1.5”X x 1.0”Y x 0.5”Z
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
V
IN1/IN2
2.5V to 6V
8
3
100
95
IN1
IN2
1
10
2
6
5
7
EN1
SW1
FB1
EN2
SW2
FB2
OFF ON
OFF ON
90
V
=3.3V
OUT
85
80
75
70
65
60
55
50
V
V
OUT2
1.2V
800mA
MP2109
OUT1
1.8V
800mA
GND1 GND2
9
4
0
500
LOAD CURRENT (mA)
1000
MP2109_S01
MP2109_EC01
MP2109 Rev.1.3
2/21/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
1
TM
MP2109 – DUAL 1.2MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER
PACKAGE REFERENCE
ABSOLUTE MAXIMUM RATINGS (1)
VIN1/IN2 to GND ............................–0.3V to +6.5V
TOP VIEW
VSW1/SW2 to GND................... –0.3V to VIN + 0.3V
VFB1/FB2, VEN1/EN2 to GND .............–0.3V to +6.5V
Junction Temperature.............................+150°C
Lead Temperature..................................+260°C
Storage Temperature .............–65°C to +150°C
Recommended Operating Conditions (2)
Supply Voltage VIN1/IN2 ....................... 2.5V to 6V
Output Voltage VOUT1/OUT2 .................. 0.6V to 6V
Operating Temperature .............–40°C to +85°C
EN1
FB1
1
2
3
4
5
10 SW1
9
8
7
6
GND1
IN1
IN2
GND2
SW2
FB2
EN2
EXPOSED PAD
ON BACKSIDE
MP2109_PD02_QFN10
Thermal Resistance (3)
θJA
θJC
QFN10 (3mm x 3mm).............50...... 12... °C/W
Part Number*
Package
Temperature
–40°C to +85°C
QFN10
(3mm x 3mm)
Notes:
MP2109DQ
1) Exceeding these ratings may damage the device.
2) The device is not guaranteed to function outside of its
operating conditions.
For Tape & Reel, add suffix –Z (eg. MP2109DQ–Z)
For Lead Free, add suffix –LF (eg. MP2109DQ–LF–Z)
*
3) Measured on approximately 1” square of 1 oz copper.
ELECTRICAL CHARACTERISTICS (4)
VIN1/IN2 = VEN1/EN2 = 3.6V, TA = +25°C, unless otherwise noted.
Parameter
Symbol Condition
VEN1/EN2 = VIN1/IN2, VFB1/FB2 = 0.65V
Min
Typ
Max
Units
Each Converter Supply Current
440
600
µA
Each Converter Shutdown
Current
VEN1/EN2 = 0V, VIN1/IN2 = 6V
Rising Edge
0.10
2.30
55
1
µA
V
IN Under Voltage Lockout
Threshold
2.15
2.40
IN Under Voltage Lockout
Hysteresis
mV
V
TA = +25°C
0.588 0.600 0.612
0.582 0.600 0.618
Regulated FB Voltage
VFB
IFB
–40°C ≤ TA ≤ +85°C
VFB1/FB2 = 0.65V
ISW1/SW2 = 100mA
ISW1/SW2 = –100mA
FB Input Bias Current
PFET On Resistance
NFET On Resistance
–50
0.5
+50
nA
Ω
0.42
0.26
Ω
V
EN1/EN2 = 0V, VIN1/IN2 = 6V
SW Leakage Current
–2
+2
µA
VSW1/SW2 = 0V or 6V
Duty Cycle = 100%,
Current Pulse Width < 1ms
PFET Current Limit
Oscillator Frequency
Thermal Shutdown Trip
Threshold
EN Enable Threshold
EN Input Current
Notes:
0.9
1.3
1.24
150
0.96
1.8
A
fOSC
0.99
1.49
MHz
°C
–40°C ≤ TA ≤ +85°C
VEN1/EN2 = 0V to 6V
0.3
–1
1.5
+1
V
µA
4) Production test at +25°C. Specifications over the temperature range are guaranteed by design and characterization.
MP2109 Rev.1.3
2/21/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
2
TM
MP2109 – DUAL 1.2MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN1/IN2 = 3.3V, VOUT1 = 1.8V, VOUT2 = 1.2V, L1/2 = 4.7µH, CIN1/IN2 = 4.7µF, COUT1/OUT2 = 10µF, TA = +25°C,
unless otherwise noted.
Efficiency vs
Load Current
Feedback Voltage vs
Temperature
100
90
80
70
60
50
0.606
0.604
0.602
0.600
0.598
0.596
0.594
V
=1.8V
OUT1
V
=1.2V
OUT2
-20
0.0
0.2
0.4
0.6
0.8
-40
0
+20 +40 +60 +80 +100
LOAD CURRENT (A)
TEMPERATURE (°C)
MP2109-TPC01
MP2109-TPC02
Load Transient
OUT
Medium Load Operation
Heavy Load Operation
(I
=0mA to 500mA Step)
(I
=400mA)
OUT
(I
=800mA)
OUT
V
V
SW
SW
V
OUT AC
2V/div.
2V/div.
100mV/div.
V
OUT AC
V
OUT AC
I
20mV/div.
L
20mV/div.
0.5A/div.
I
L
I
I
L
LOAD
0.5A/div.
200mA/div.
500mA/div.
400ns/div
400ns/div
MP2109-TPC03
MP2109-TPC04
MP2109-TPC05
Short Circuit Protection
(No Load)
Short Circuit Recovery
(No Load)
Startup from Shutdown
V
EN
2V/div
V
OUT
V
OUT
1V/div
1V/div
V
OUT
1V/div
I
I
I
L
L
L
0.5A/div
0.5A/div
0.5A/div
MP2109-TPC07
MP2109-TPC08
MP2109-TPC06
MP2109 Rev.1.3
2/21/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
3
TM
MP2109 – DUAL 1.2MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER
PIN FUNCTIONS
Pin # Name Description
Channel 1 Enable Control Input. Drive EN1 above 1.5V to turn on the Channel 1. Drive EN1
below 0.3V to turn it off (shutdown current < 0.1µA).
1
2
EN1
FB1
Channel 1 Feedback Input. Connect FB1 to the center point of the external resistor divider. The
feedback voltage is 0.6V.
3
4
IN2 Channel 2 Supply Input. Bypass to GND with a 2.2µF or greater ceramic capacitor.
GND2 Ground 2.
Channel 2 Power Switch Output. Inductor connection to drains of the internal PFET and NFET
switches.
5
6
7
SW2
Channel 2 Enable Control Input. Drive EN2 above 1.5V to turn on the Channel 2. Drive EN2
below 0.3V to turn it off (shutdown current < 0.1µA).
EN2
Channel 2 Feedback Input. Connect FB2 to the center point of the external resistor divider. The
feedback voltage is 0.6V.
FB2
8
9
IN1 Channel 1 Supply Input. Bypass to GND with a 2.2µF or greater ceramic capacitor.
GND1 Ground 1.
Channel 1 Power Switch Output. Inductor connection to drains of the internal PFET and NFET
switches.
10
SW1
MP2109 Rev.1.3
2/21/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
4
TM
MP2109 – DUAL 1.2MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER
OPERATION
IN1/
IN2
+
BIAS
IAMP
10X
EN1/
EN2
&
VOLTAGE
REFERENCE
--
CURRENT
SENSE
AMP
ICS
0.6V
+
PWM
DH
SLOPE COMP
EAO
+
FEEDBACK
ERROR\ EAMP
AMP
+
--
PWMCMP
MAIN
SWITCH
(PCH)
FB1/
FB2
--
SW1/
SW2
PWM
CONTROL
LOGIC
CC
17pF
OSC
SYNCHRONOUS
RECTIFIER
(NCH)
1.0MHz
OSCILLATOR
DL
GND1/
GND2
MP2109_BD02
Figure 1—Functional Block Diagram (Diagram represents ½ of the MP2109)
The MP2109 has dual independent constant
frequency current mode PWM step-down
converters. The MP2109 is optimized for low
voltage, Li-Ion battery powered applications
where high efficiency and small size are critical.
The MP2109 uses external resistor dividers to
set two output voltages independently from
0.6V to 6V. The device integrates both main
switches and synchronous rectifiers, which
provides high efficiency and eliminates the
need for an external Schottky diode. The
MP2109 can achieve 100% duty cycle. The
duty cycle D of each step-down converter is
defined as:
Current Mode PWM Control
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. Each channel switches at
a constant frequency (1.2MHz) 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 the next cycle
starts.
VOUT
D = TON × fOSC ×100% =
×100%
VIN
Where TON is the main switch on time, fOSC is
the oscillator frequency (1.2MHz), VOUT is the
output voltage and VIN is the input voltage.
MP2109 Rev.1.3
2/21/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
5
TM
MP2109 – DUAL 1.2MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER
Maximum Load Current
Dropout Operation
Each channel of the MP2109 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.
The MP2109 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.
Short Circuit Protection
The MP2109 has short circuit protection. When
any 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.
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 × V − VOUT
(
)
IN
−1
L =
0.6V
V × ∆IL × fOSC
IN
Table 1—Resistor Selection vs. Output
Voltage Setting
Where ∆IL is inductor ripple current. Choose
inductor ripple current approximately 30% of the
maximum load current, 800mA.
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
IL(MAX) = ILOAD
+
2
Under light load conditions below 100mA, larger
inductance is recommended for improved
efficiency. Table 3 lists inductors recommended
for this purpose.
MP2109 Rev.1.3
2/21/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
6
TM
MP2109 – DUAL 1.2MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER
Table 2—Suggested Surface Mount Inductors
Saturation
Current (A)
Dimensions
Manufacturer
Coilcraft
Part Number
LP03310-222ML
1002AS
Inductance (µH) Max DCR (Ω)
LxWxH (mm3)
2.2
2.2
2.2
0.15
0.11
0.072
1.1
1.14
1.20
3.3 x 3.3 x 1
4.6 x 4.6 x 1.2
4 x 4 x 1.8
Toko
Sumida
CDRH3D16
Table 3—Inductors for Improved Efficiency at 25mA, 50mA, under 100mA Load.
Saturation
Manufacturer
Part Number
DO1605T-103MX
LQH4C100K04
CR32-100
Inductance (µH) Max DCR (Ω)
Current (A)
IRMS (A)
Coilcraft
Murata
Sumida
Sumida
10
10
10
10
0.3
0.2
0.2
0.1
1.0
1.2
1.0
1.2
0.9
0.8
0.7
1.4
CR54-100
Input Capacitor Selection
Thermal Dissipation
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.
Power dissipation shall be considered when
both channels of the MP2109 provide maximum
800mA output current to the loads at high
ambient temperature with low input supply
voltage. If the junction temperature rises above
150°C, the MP2109 two channels will be shut
down.
The junction-to-ambient thermal resistance of
the 10-pin QFN (3mm x 3mm) RΘJA is 50°C/W.
The maximum power dissipation is about 1.6W
when the MP2109 is operating in a 70°C
ambient temperature environment.
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:
150o C − 70o C
PDMAX
=
= 1.6W
50o C / W
PC Board Layout
The high current paths (GND1/GND2, IN1/IN2
and SW1/SW2) should be placed very close to
the device with short, direct and wide traces.
Input capacitors should be placed as close as
possible to the respective IN and GND pins.
The external feedback resistors shall be placed
next to the FB pins. Keep the switching nodes
SW1/SW2 short and away from the feedback
network.
⎛
⎜
⎝
⎞
VOUT
×
(
VIN − VOUT
)
1
⎜
⎟
⎟
⎠
∆VOUT
≤
× ESR +
VIN × fOSC × L
8 × fOSC × C3
MP2109 Rev.1.3
2/21/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
7
TM
MP2109 – DUAL 1.2MHz 800mA SYNCHRONOUS STEP-DOWN CONVERTER
PACKAGE INFORMATION
QFN10 (3mm x 3mm)
0.35
0.45
Pin1
Identif ication
R0.200TY P
2.95
3.05
Pin1
Identif ication
0.20
0.30
10
1
2.35
2.000
QFN10L
(3 x3mm)
2.95
3.05
2.45
Ref
Exp.DAP
0.500
Bsc
6
5
1.65
1.75
Exp.DAP
TopView
BottomView
0.85
0.95
0.178
0.228
0.000-
0.050
SideView
Note:
1)Dimensionsareinmillimeters.
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.
MP2109 Rev. 1.3
2/21/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
8
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