MP2143H
3A, 5.5V, 2.0MHz
Synchronous Step Down Switcher
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP2143H is a monolithic, step-down,
switch-mode converter with internal power
MOSFETs. It can achieve up to 3A continuous
output current from a 2.5V to 5.5V input voltage
with excellent load and line regulation. The
output voltage can be regulated as low as 0.6V.
Constant-on-time control provides fast transient
response and eases loop stabilization. Faultcondition protections include cycle-by-cycle
current limiting and thermal shutdown.
The MP2143H is available in small QFN-10
package and requires only a minimal number of
readily-available standard external components.
The MP2143H is ideal for a wide range of
applications including high-performance DSPs,
FPGAs, and portable instruments.
Wide 2.5V to 5.5V Operating Input Range
Output Voltage as Low as 0.6V
100% Duty Cycle in Dropout
Up to 3A Output Current
80mΩ and 40mΩ Internal Power MOSFET
Switches
Default 2.0MHz Switching Frequency
EN and Power-Good for Power Sequencing
Cycle-by-Cycle Over-Current Protection
Auto Discharge at Power Off
Short-Circuit Protect with Hiccup Mode
Stable with Low-ESR Output Ceramic
Capacitors
Available in QFN-10 (2mmx3mm) Package
APPLICATIONS
Low Voltage I/O System Power
Handheld/Battery-powered Systems
Wireless/Networking Cards
All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive.
For MPS green status, please visit the MPS website under Quality Assurance.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
U1
VIN
VIN
100
L1
VOUT
SW
80
OUT
C1
C2
R1
EN
EN
PG
PGND AGND
70
60
50
40
FB
PG
90
30
R2
20
10
0
0
0.5
1
1.5
MP2143H Rev. 1.02
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2
2.5
3
3.5
1
MP2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER
ORDERING INFORMATION
Part Number*
MP2143HGD
Package
QFN-10(2mmx3mm)
Top Marking
See Below
* For Tape & Reel, add suffix –Z (e.g. MP2143HGD–Z).
TOP MARKING
AMT: product code of MP2143HGD;
Y: year code;
WW: week code:
LLL: lot number;
PACKAGE REFERENCE
QFN-10 (2mmx 3mm)
MP2143H Rev. 1.02
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2
MP2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance
Supply Voltage VIN ......................................... 6V
VSW…………………………
-0.3V (-5V for =3.3V,
TJ =-40°C to 125°C (5)
1800
3000
tMIN-OFF
μA
2000
kHz
50
ns
Soft-Start Time
tSS-ON
VOUT=1.2V, 10% to 90%
1.3
ms
Soft-Stop Time
tSS-OFF
VOUT=1.2V, 90% to 10%
1
ms
110
%
5
%
90
%
PGL_Hys
5
%
PGD
110
μs
Power-Good Upper Trip
Threshold
Power-Good Upper Trip
Hysteresis
Power-Good Lower Trip
Threshold
Power-Good Lower Trip
Hysteresis
Power-Good Delay
Power-Good Sink Current
Capability
Power-Good Logic High
Voltage
Power-Good Internal Pull-Up
Resistor
Under-Voltage Lockout
Threshold Rising
Under-Voltage Lockout
Threshold Hysteresis
PGH
FB falling when PG turn
to high voltage
PGH_Hys
PGL
FB Rising when PG turn
to high voltage
VPG-L
Sink 1mA
VPG-H
VIN=5V, VFB=0.6V
400
4.9
V
500
RPG
2.0
mV
2.2
150
MP2143H Rev. 1.02
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kΩ
2.4
V
mV
4
MP2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER
ELECTRICAL CHARACTERISTICS
VIN = 5V, TJ = -40°C to 125°C, Typical value is tested at TJ=+25°C. The limit over temperature is
guaranteed by characterization, unless otherwise noted.
Parameter
Symbol
Condition
Min
Typ
EN Input Logic Low Voltage
EN Input Logic High Voltage
EN Input Current
Supply Current (Shutdown)
Thermal Shutdown
1.2
Max
Units
0.4
V
V
VEN=2V
2
μA
VEN=0V
0.1
μA
VEN=0V
0.1
μA
170
°C
30
°C
(6)
Thermal Hysteresis (6)
Notes:
5) Guaranteed by characterization, not production tested.
6) Design Guarantee, no production test.
MP2143H Rev. 1.02
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MP2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 5V, VOUT = 1.2V, L = 0.47μH, COUT=22μF, TA = 25°C, unless otherwise noted.
100
0.60
0.6
0.40
0.4
0.20
0.2
0.00
0.0
-0.20
-0.2
-0.40
-0.4
90
80
70
60
50
40
30
20
10
0
0
0.5
1
1.5
2
2.5
3
3.5
70
60
-0.60
0
0.5
1
1.5
2
2.5
3
3.5
0.003
3
2.9
0.0025
2.8
50
2.5
2.4
20
0.001
10
0.0005
0
2.6
0.0015
30
2 2.5 3 3.5 4 4.5 5 5.5 6
2.7
0.002
40
-0.6
0
0.5
1
1.5
2
2.5
3
3.5
02 2.5
2.3
2.2
3 3.5
4 4.5
5
5.5 6
2.1
2
-50
0
50
MP2143H Rev. 1.02
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100
150
6
MP2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 3.3V, VOUT = 1.2V, L = 0.47μH, COUT=22μF, TA = 25°C, unless otherwise noted.
VOUT(AC)
10mV/div.
VOUT(AC)
10mV/div.
VOUT(AC)
10mV/div.
VIN
2V/div.
VIN
2V/div.
VIN
2V/div.
VSW
1V/div.
IL
2A/div.
VSW
1V/div.
VSW
1V/div.
IL
2A/div.
IL
2A/div.
VOUT
1V/div.
VIN
5V/div.
VOUT
1V/div.
VIN
5V/div.
VOUT
1V/div.
VIN
5V/div.
VSW
2V/div.
VSW
2V/div.
VSW
2V/div.
IL
2A/div.
IL
2A/div.
IL
2A/div.
VOUT
1V/div.
VOUT
1V/div.
VOUT
1V/div.
VEN
2V/div.
VEN
2V/div.
VSW
2V/div.
VSW
200mV/div.
VEN
2V/div.
VSW
200mV/div.
IL
2A/div.
IL
2A/div.
IL
2A/div.
MP2143H Rev. 1.02
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© 2016 MPS. All Rights Reserved.
7
MP2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 3.3V, VOUT = 1.2V, L = 0.47μH, COUT=22μF, TA = 25°C, unless otherwise noted.
VOUT
1V/div.
VOUT
1V/div.
VEN
2V/div.
VSW
200mV/div.
VEN
2V/div.
VSW
200mV/div.
IL
2A/div.
IL
2A/div.
IL
1A/div.
VOUT
1V/div.
VPG
2V/div.
VOUT(AC)
20mV/div.
VOUT
1V/div.
VSW
2V/div.
VSW
200mV/div.
VSW
200mV/div.
IL
1A/div.
IL
2A/div.
IL
2A/div.
VOUT
1V/div.
VOUT
1V/div.
VIN
2V/div.
VSW
2V/div.
VIN
2V/div.
VSW
2V/div.
IL
2A/div.
IL
2A/div.
VOUT
1V/div.
VPG
2V/div.
VSW
2V/div.
VIN
2V/div.
MP2143H Rev. 1.02
www.MonolithicPower.com
6/30/2016
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© 2016 MPS. All Rights Reserved.
8
MP2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER
PIN FUNCTIONS
QFN-10
Pin #
Name
1
EN
2
FB
3
4
5
6, 7
8
AGND
OUT
NC
PGND
SW
9
VIN
10
PG
Description
On/Off Control
Feedback pin. Connect an external resistor divider from the output to AGND to set the
output voltage.
Analog ground. Reference for the internal control circuit.
Input Sense. For output voltage feedback.
Not Connected. It can be floated or connected to PGND for thermal.
Power Ground
Switch Output
Supply Voltage. The MP2143H operates from a 2.5V-to-5.5V unregulated input. C1
prevents large voltage spikes from appearing at the input.
Power-Good Indicator. The pin output is an open drain that connects to VIN by an internal
pull-up resistor. PG is pulled up to VIN when the FB voltage is within ±10% of the
regulation level. If FB voltage is out of that regulation range, it is LOW.
MP2143H Rev. 1.02
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MP2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER
FUNCTIONAL BLOCK DIAGRAM
VIN
Bias
&
Voltage
Reference
EN
Soft start
+
COMP
VTH
Lo-Iq
0.6V
RST
+
+ E.A.
-
Constant
On -Time
Pulse
PDRV
PWM
Main
Switch
(PCH)
PWM
+
Lo-Iq
+
FB
SW
EN
FBCOMP
Driver
VOUT
Lo-Iq
Ramp
Generator
Synchronous
Rectifier
( NCH)
SW
Lo-Iq
Hi-Z
NDRV
OUT
PGND
VIN
FB for
Fixed Output
0.66V
+
+
COMP
COMP
-
Lo-Iq
+
COMP
0.54V
AGND
PG
-
Figure 1: Functional Block Diagram
MP2143H Rev. 1.02
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6/30/2016
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MP2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER
OPERATION
The MP2143H uses constant-on-time control
with input-voltage feed-forward to stabilize the
switching frequency over its full input range. It
can achieve up to 3A continuous output current
from a 2.5V to 5.5V input voltage with excellent
load and line regulation. The output voltage can
be regulated as low as 0.6V.
Constant-On-Time Control
When compared to fixed-frequency PWM control,
constant on-time control offers a simpler control
loop and faster transient response. By using
input-voltage feed-forward, the MP2143H
maintains a nearly constant switching frequency
across the entire input and output voltage range.
The switching pulse ON time can be estimated as:
Ton=VOUT/VIN×0.500µs
To prevent inductor current runaway during the
load transient, the MP2143H has a fixed minimum
OFF time of 50ns. However, this minimum OFF
time limit does not affect the operation of the
MP2143H in steady state in any way.
Enable
When the input voltage exceeds the undervoltage lockout (UVLO) threshold—typically
2.2V—the MP2143H is enabled by pulling the
EN pin above 1.2V. Leaving the EN pin floating
or grounded will disable the MP2143H. There is
an internal 1MΩ resistor from the EN pin to
ground.
Power Good Indicator
MP2143H has an open drain with 500kΩ pull-up
resistor pin for power good (PG) indication.
When the FB pin is within ±10% of regulation
voltage (0.6V), the PG pin is pulled up to VIN by
the internal resistor. If the FB pin voltage is
outside the ±10% window, the PG pin is pulled
to ground by an internal MOSFET. The
MOSFET has a maximum Rdson of less than
100Ω.
Current Limit
The MP2143H has a 4.8A current limit for the
high side switch (HS-FET). When the HS-FET
hits its current limit, the MP2143H enters hiccup
mode until the current drops to prevent the
inductor current from building and possibly
damaging the components.
Short Circuit and Recovery
The MP2143H also enters short-circuit
protection (SCP) mode when it hits the current
limit, and tries to recover from the short circuit
by entering hiccup mode. In SCP, the
MP2143H disables the output power stage,
discharges a soft-start capacitor, and then
enacts a soft-start procedure. If the short-circuit
condition still holds after soft-start ends, the
MP2143H repeats this operation until the short
circuit ceases and output rises back to
regulation level.
Soft-Start/Stop
MP2143H has a built-in soft-start that ramps up
the output voltage at a constant slew rate that
avoids overshooting at startup. The soft-start
time is typically about 1.3ms. When disabled,
the MP2143H ramps down the internal
reference voltage to allow the load to linearly
discharge the output.
MP2143H Rev. 1.02
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6/30/2016
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MP2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER
APPLICATION INFORMATION
COMPONENT SELECTION
Setting the Output Voltage
The external resistor divider sets the output
voltage (see the Typical Application schematic
on page 1). The feedback resistor R1 must
account for both stability and dynamic response,
and thus can not be too large or too small.
Choose an R1 value between 120kΩ and
200kΩ. R2 is then given by:
R2
R1
Vout
1
0.6
The feedback circuit is shown as Figure 2.
Vout
MP2143H
R1
R2
Figure 2: Feedback Network
Table 1 lists the recommended resistors values
for common output voltages.
Table 1: Resistor Values for Common Output
Voltages
R1 (kΩ)
200(1%)
200(1%)
200(1%)
200(1%)
200(1%)
IL(MAX) ILOAD
IL
2
Selecting the Input Capacitor
The input current to the step-down converter is
discontinuous, and requires a capacitor to
supply the AC current to the step-down
converter while maintaining the DC input
voltage. Use low-ESR capacitors for the best
performance. Ceramic capacitors with X5R or
X7R dielectrics are highly recommended
because of their low ESR values and small
temperature coefficients. For most applications,
a 10µF capacitor is sufficient. For higher output
voltage, use 47μF to improve system stability.
Since the input capacitor absorbs the input
switching current it requires an adequate ripple
current rating. The RMS current in the input
capacitor can be estimated by:
FB
VOUT (V)
1.0
1.2
1.8
2.5
3.3
Choose an inductor current to be approximately
30% of the maximum load current. The
maximum inductor peak current is:
R2 (kΩ)
300(1%)
200(1%)
100(1%)
63.2(1%)
44.2(1%)
Selecting the Inductor
A 0.47µH to 1.5µH inductor is recommended for
most applications. For highest efficiency, chose
an inductor with a DC resistance less than
15mΩ. For most designs, the inductance value
can be derived from the following equation.
V (VIN VOUT )
L1 OUT
VIN IL fOSC
I C1 ILOAD
VOUT VOUT
1
VIN
VIN
The worse case condition occurs at VIN = 2VOUT,
where:
IC1
ILOAD
2
For simplification, choose an input capacitor
whose RMS current rating greater than half of
the maximum load current.
The input capacitor can be electrolytic, tantalum
or ceramic. When using electrolytic or tantalum
capacitors, use a small high-quality ceramic
capacitor (0.1μF), placed as close to the IC as
possible. When using ceramic capacitors, make
sure that they have enough capacitance to
prevent excessive voltage ripple at input. The
input voltage ripple caused by capacitance can
be estimated by:
VIN
ILOAD
V
V
OUT 1 OUT
fS C1 VIN
VIN
Where ΔIL is the inductor ripple current.
MP2143H Rev. 1.02
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12
MP2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER
Selecting the Output Capacitor
The output capacitor (C2) maintains the output
DC voltage. Use ceramic capacitors. Low-ESR
capacitors keep the output voltage ripple low.
The output voltage ripple can be estimated by:
VOUT
VOUT
V
1 OUT
fS L1
VIN
1
RESR
8 fS C2
GND
R1
R2
Where L1 is the inductor value and RESR is the
equivalent series resistance of the output
capacitor.
Using ceramic capacitors, the impedance at the
switching frequency is dominated by the
capacitance. The output voltage ripple is mainly
caused by the capacitance. For simplification,
the output voltage ripple can be estimated by:
ΔVOUT
GND
C1
1
10
2
9
3
8
4
7
5
6
VIN
C2
SW
VOUT
Top Layer
V
VOUT
1 OUT
VIN
8 fS L1 C2
2
For tantalum or electrolytic capacitors, the ESR
dominates the impedance at the switching
frequency. For simplification, the output ripple
can be approximated as:
ΔVOUT
VOUT
V
1 OUT
fS L1
VIN
RESR
The characteristics of the output capacitor also
affect the stability of the regulation system.
PCB Recommendation of MP2143H
Proper layout of the switching power supplies is
very important, and sometimes critical for
proper operation. For high-frequency switching
converters, poor layout could lead to poor line
or load regulation and stability issues.
Bottom Layer
Figure 3: Layout Recommendation
The high current paths (GND, VIN, and SW)
should be placed very close to the device using
short, direct, and wide traces. The input
capacitor needs to be as close as possible to
the VIN and GND pins. The external feedback
resistors should be placed next to the FB pin.
Keep the switching node SW short and away
from the feedback network.
MP2143H Rev. 1.02
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13
MP2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER
TYPICAL APPLICATION CIRCUITS
Figure 4: MP2143H Typical Application Circuit
MP2143H Rev. 1.02
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14
MP2143H – 3A, 5.5V, 2.0MHz, SYNCHRONOUS STEP-DOWN SWITCHER
PACKAGE INFORMATION
QFN-10 (2mmx3mm)
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.
MP2143H Rev. 1.02
www.MonolithicPower.com
6/30/2016
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© 2016 MPS. All Rights Reserved.
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