MP2143
3A, 5.5V, 1.2MHz, 40μA IQ, COT
Synchronous Step Down Switcher
MP2143 Rev. 1.05 www.MonolithicPower.com 1
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© 2012 MPS. All Rights Reserved.
The Future of Analog IC Technology
DESCRIPTION
The MP2143 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. Fault-
condition protections include cycle-by-cycle
current limiting and thermal shutdown.
The MP2143 is available in small TSOT23-8
package and requires only a minimal number of
readily-available standard external components.
The MP2143 is ideal for a wide range of
applications including high-performance DSPs,
FPGAs, smartphones, portable instruments,
and DVD drivers.
FEATURES
• 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
• Low IQ: 40µA
• 80m and 40m Internal Power MOSFET
Switches
• Default 1.2MHz 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 a TSOT23-8 Package
APPLICATIONS
• Low Voltage I/O System Power
• Handheld/Battery-powered Systems
• Wireless/Networking Cards
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Quality Assurance. “MPS” and “The
Future of Analog IC Technology” are Registered Trademarks of Monolithi
c
Power Systems, Inc.
TYPICAL APPLICATION
MP2143
GND
FB
VIN
C1
10 F
EN
VIN
2.5V to 5.5V
VOUT
1.2V/3A
SW
C2
10 F
32
8
1
5
R1
200k
R2
200k
PG
EN
PG
4, 6
OUT
7
L1
1H
MP2143 – 3A, 5.5V, 1.2MHz, 40μA IQ, COT SYNCHRONOUS STEP-DOWN SWITCHER
MP2143 Rev. 1.05 www.MonolithicPower.com 2
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ORDERING INFORMATION
Part Number* Package Top Marking
MP2143DJ TSOT23-8 ACE
* For Tape & Reel, add suffix –Z (e.g. MP2143DJ–Z);
For RoHS compliant packaging, add suffix –LF (e.g. MP2143DJ–LF–Z)
PACKAGE REFERENCE
TOP VIEW
4
3
2
18
7
6
5
PG
VIN
SW
PGND
EN
FB
AGND
OUT
SOT23-8
ABSOLUTE MAXIMUM RATINGS (1)
Supply Voltage VIN ......................................... 6V
VSW ........................ (-3V for < 5ns) to (VIN+0.3V)
All Other Pins.................................-0.3V to +6 V
Junction Temperature...............................150°C
Lead Temperature ....................................260°C
Continuous Power Dissipation (TA = 25°C) (2)
……….….. ............................................... 1.25W
Storage Temperature............... -65°C to +150°C
Recommended Operating Conditions (3)
Supply Voltage VIN ..........................2.5V to 5.5V
Output Voltage VOUT................. 0.6V to VIN -0.5V
Operating Junction Temp. (TJ). -40°C to +125°C
Thermal Resistance (4) θJA θJC
TSOT23-8.............................. 100..... 55... °C/W
Notes:
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 JA, and the ambient temperature
TA. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by PD (MAX) = (TJ
(MAX)-TA)/JA. Exceeding the maximum allowable powe
r
dissipation will cause excessive die temperature, and the
regulator will go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent
damage.
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7, 4-layer PCB.
MP2143 – 3A, 5.5V, 1.2MHz, 40μA IQ, COT SYNCHRONOUS STEP-DOWN SWITCHER
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ELECTRICAL CHARACTERISTICS (5)
VIN = 5V, TA = 25°C, unless otherwise noted.
Parameter Symbol Condition Min Typ Max Units
2.5V VIN 5.5V -1.5% 0.600 +1.5%
Feedback Voltage VFB TA=-40oC to +85oC -2% +2% V/%
Feedback Current IFB V
FB = 0.63V 10 nA
PFET Switch ON Resistance RDSON_P 80 m
NFET Switch ON Resistance RDSON_N 40 m
Switch Leakage VEN = 0V, VIN = 5V
VSW = 0V and 5V 0.1 2 A
PFET Current Limit 4.2 4.8 A
NFET Switch Sinking Current INSW V
OUT=1.2V, VFB=0.7V 100 A
VIN=5V, VOUT=1.2V 200
ON Time tON VIN=3.6V, VOUT=1.2V 277
nS
VIN=5V, VOUT=1.2V, IOUT=1A -20% 1200 +20% kHz
Switching frequency fs TA=-40oC to +85oC -25% 1200 +25% kHz
Minimum OFF Time tMIN-OFF 50 ns
Soft-Start Time tSS-ON 1.3 ms
Soft-Stop Time tSS-OFF 1 ms
Power-Good Upper Trip
Threshold PGH FB voltage respect to the
regulation +10% %
Power-Good Lower Trip
Threshold PGL -10% %
Power-Good Delay PGD 110 s
Power-Good Sink Current
Capability VPG-L Sink 1mA 0.4 V
Power-Good Logic High Voltage VPG-H V
IN=5V, VFB=0.6V 4.9 V
Power-Good Internal Pull-Up
Resistor RPG 500 k
Under-Voltage Lockout Threshold
Rising 2.0 2.2 2.4 V
Under-Voltage Lockout Threshold
Hysteresis 150 mV
EN Input Logic Low Voltage 0.4 V
EN Input Logic High Voltage 1.2 V
VEN=2V 2 A
EN Input Current VEN=0V 0.1 A
Supply Current (Shutdown) VEN=0V 0.1 A
Supply Current (Quiescent) VEN=2V, VFB=0.63V,
VIN=3.6V 40 A
Thermal Shutdown 150 °C
Thermal Hysteresis 30 °C
Notes:
5) Guaranteed by design.
MP2143 – 3A, 5.5V, 1.2MHz, 40μA IQ, COT SYNCHRONOUS STEP-DOWN SWITCHER
MP2143 Rev. 1.05 www.MonolithicPower.com 4
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TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 5V, VOUT = 1.2V, L = 1.0µH, COUT=22µF, TA = 25°C, unless otherwise noted.
0.01 0.1 1 10 0.001 0.01 0.1 1 10 2 2.5 3 3.5 4 4.5 5 5.5 6
02 2.5 3 3.5 4 4.5 5 5.5 6 00.5 1 1.5 2 2.5 3 3.5
ERROR
-0.60%
-0.40%
-0.20%
0.00%
0.20%
0.40%
0.60%
2.0 3.0 4.0 5.0 6.0
0
10
20
30
40
50
60
70
80
0 0.5 1 1.5 2 2.5 3 3.5 4
MP2143 – 3A, 5.5V, 1.2MHz, 40μA IQ, COT SYNCHRONOUS STEP-DOWN SWITCHER
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TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 5V, VOUT = 1.2V, L = 1.0µH, COUT=22µF, TA = 25°C, unless otherwise noted
V
out
50.0mV/div.
V
sw
2.00V/div.
I
L
1.00A/div.
Output Ripple
I
OUT
=0A
V
out
10.0mV/div.
V
sw
2.00V/div.
I
L
1.00A/div.
V
out
10.0mV/div.
V
sw
2.00V/div.
I
L
2.00A/div.
V
out
100mV/div.
V
sw
5.00V/div.
I
L
2.00A/div.
V
out
20.0mV/div.
V
sw
5.00V/div.
I
L
2.00A/div.
V
out
500mV/div.
V
sw
5.00V/div.
V
in
5.00V/div.
I
L
2.00A/div.
V
out
500mV/div.
V
sw
5.00V/div.
V
in
5.00V/div.
I
L
2.00A/div.
V
out
500mV/div.
V
sw
2.00V/div.
V
in
2.00V/div.
V
out
500mV/div.
V
sw
2.00V/div.
V
in
2.00V/div.
I
L
2.00A/div.
Output Ripple
I
OUT
=1A
Output Ripple
I
OUT
=3A
Output Ripple
V
IN
= 6V, V
OUT
= 0.6V, I
OUT
=0A
Output Ripple
V
IN
= 6V, V
OUT
= 0.6V, I
OUT
=3A
VIN Power Up
without Load
VIN Power Up
with 3A Load
VIN Shut Down
without Load
VIN Shut Down
with 3A Load
MP2143 – 3A, 5.5V, 1.2MHz, 40μA IQ, COT SYNCHRONOUS STEP-DOWN SWITCHER
MP2143 Rev. 1.05 www.MonolithicPower.com 6
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.TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 5V, VOUT = 1.2V, L = 1.0µH, COUT=22µF, TA = 25°C, unless otherwise noted.
V
OUT
500mV/div.
V
SW
5.00V/div.
V
EN
2.00V/div.
I
L
2.00A/div.
EN Start Up without Load EN Start Up with 3A Load EN Shut Down without Load
EN Shut Down with 3A Load Power Good On without Load Power Good On with 3A Load
Power Good Off without Load Power Good Off with 3A Load Load Transient Response
V
OUT
500mV/div.
V
SW
5.00V/div.
V
EN
2.00V/div.
I
L
2.00A/div.
V
OUT
500mV/div.
V
SW
5.00V/div.
V
EN
2.00V/div.
I
L
1.00A/div.
V
OUT
500mV/div.
V
SW
2.00V/div.
V
EN
2.00V/div.
I
L
2.00A/div.
V
OUT
1.00V/div.
V
SW
5.00V/div.
V
PG
5.00V/div.
I
L
1.00A/div.
V
OUT
500mV/div.
V
SW
5.00V/div.
V
PG
5.00V/div.
I
L
2.00A/div.
V
OUT
1.00V/div.
V
SW
5.00V/div.
V
PG
5.00V/div.
I
L
1.00A/div.
V
OUT
500mV/div.
V
SW
5.00V/div.
V
PG
5.00V/div.
I
L
2.00A/div.
V
OUT
/AC
20.0mV/div.
V
SW
5.00V/div.
I
L
2.00A/div.
MP2143 – 3A, 5.5V, 1.2MHz, 40μA IQ, COT SYNCHRONOUS STEP-DOWN SWITCHER
MP2143 Rev. 1.05 www.MonolithicPower.com 7
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TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 5V, VOUT = 1.2V, L = 1.0µH, COUT=22µF, TA = 25°C, unless otherwise noted.
V
OUT
1.00V/div.
V
SW
5.00V/div.
I
L
5.00A/div.
Short Circuit Entry
V
IN
= 6V
Short Circuit
V
IN
= 6V
Short Circuit Recovery
V
IN
= 6V
V
OUT
1.00V/div.
V
SW
5.00V/div.
I
L
5.00A/div.
V
OUT
1.00V/div.
V
SW
5.00V/div.
I
L
5.00A/div.
MP2143 – 3A, 5.5V, 1.2MHz, 40μA IQ, COT SYNCHRONOUS STEP-DOWN SWITCHER
MP2143 Rev. 1.05 www.MonolithicPower.com 8
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PIN FUNCTIONS
TSOT23
Pin # Name Description
1 PG
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.
2 VIN
Supply Voltage. The MP2143 operates from a 2.5V-to-5.5V unregulated input. C1
prevents large voltage spikes from appearing at the input.
3 SW Switch Output
4 PGND Power Ground
5 OUT Input Sense. For output voltage feedback
6 AGND Analog ground. Reference for the internal control circuit.
7 FB
Feedback pin. Connect an external resistor divider from the output to GND to set the
output voltage.
8 EN On/Off Control
MP2143 – 3A, 5.5V, 1.2MHz, 40μA IQ, COT SYNCHRONOUS STEP-DOWN SWITCHER
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FUNCTIONAL BLOCK DIAGRAM
Figure 1: Functional Block Diagram
MP2143 – 3A, 5.5V, 1.2MHz, 40μA IQ, COT SYNCHRONOUS STEP-DOWN SWITCHER
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OPERATION
The MP2143 uses constant on-time control with
input-voltage feed-forward to stabilize the
switching frequency over its full input range. At
light load, the MP2143 employs a proprietary
control over the low-side MOSFET (LS-FET)
and inductor current to eliminate ringing on
switching node and to improve efficiency.
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 MP2143 maintains
a nearly constant switching frequency across the
entire input and output voltage range. The
switching pulse ON time can be estimated as:
OUT
ON
IN
V
t0.833s
V
=⋅μ
To prevent inductor current runaway during the
load transient, the MP2143 has a fixed minimum
OFF time of 50ns. However, this minimum OFF
time limit does not affect the operation of the
MP2143 in steady state in any way.
Light Load Operation
In light load condition, the MP2143 uses a
proprietary control scheme to save power and
improve efficiency: It gradually ramps down the
LS-FET current to its minimum instead of
turning off the LS-FET immediately when the
inductor current starts to reverse. The gradual
current drop avoids ringing at the switching
node that always occurs in discontinuous
conduction mode (DCM) operation.
Enable
When the input voltage exceeds the under-
voltage lockout (UVLO) threshold—typically
2.2V—the MP2143 is enabled by pulling the EN
pin above 1.2V. Leaving the EN pin floating or
grounded will disable the MP2143. There is an
internal 1M resistor from the EN pin to ground.
Soft-Start/Stop
MP2143 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 1ms. When disabled, the
MP2143 ramps down the internal reference
voltage to allow the load to linearly discharge
the output.
Power GOOD Indictor
MP2143 has an open drain with 500k 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
100.
Current limit
The MP2143 has a 4.8A current limit for the
high side switch (HS-FET). When the HS-FET
hits its current limit, the MP2143 enters hiccup
mode until the current drops to prevent the
inductor current from building and possibly
damaging the components.
Short Circuit and Recovery
The MP2143 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 MP2143 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 MP2143 repeats
this operation until the short circuit ceases and
output rises back to regulation level.
MP2143 – 3A, 5.5V, 1.2MHz, 40μA IQ, COT SYNCHRONOUS STEP-DOWN SWITCHER
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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 120k and
200k. R2 is then given by:
out
R1
R2 V1
0.6
=
−
The feedback circuit is shown as Figure 2.
Figure 2: Feedback Network
Table 1 lists the recommended resistors values
for common output voltages.
Table 1: Resistor Values for Common Output
Voltages
VOUT (V) R1 (kΩ) R2 (kΩ)
1.0 200(1%) 300(1%)
1.2 200(1%) 200(1%)
1.8 200(1%) 100(1%)
2.5 200(1%) 63.2(1%)
3.3 200(1%) 44.2(1%)
Selecting the Inductor
A 0.82µH to 4.7µH inductor is recommended for
most applications. For highest efficiency, chose
an inductor with a DC resistance less than
15m. For most designs, the inductance value
can be derived from the following equation.
OUT IN OUT
1
IN L OSC
V(VV)
LVIf
×−
=×Δ ×
Where IL is the inductor ripple current.
Choose an inductor current to be approximately
30% of the maximum load current. The
maximum inductor peak current is:
L
L(MAX) LOAD
I
II2
Δ
=+
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 47F 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:
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
×−×=
IN
OUT
IN
OUT
LOAD1C V
V
1
V
V
II
The worse case condition occurs at VIN =
2VOUT, where:
2
I
ILOAD
1C =
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 (0.1F), 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:
LOAD OUT OUT
IN IN
SIN
IV V
V1
fC1V V
⎛⎞
Δ= × ×−
⎜⎟
×⎝⎠
MP2143 – 3A, 5.5V, 1.2MHz, 40μA IQ, COT SYNCHRONOUS STEP-DOWN SWITCHER
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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:
OUT OUT
OUT ESR
S1 IN S
VV 1
V1R
fL V 8fC2
⎛⎞
⎛⎞
Δ= ×− × +
⎜⎟
⎜⎟
×××
⎝⎠
⎝⎠
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:
OUT OUT
OUT 2
IN
S1
VV
V1
V
8f L C2
⎛⎞
=×−
⎜⎟
××× ⎝⎠
For tantalum or electrolytic capacitors, the ESR
dominates the impedance at the switching
frequency. For simplification, the output ripple
can be approximated as:
OUT OUT
OUT ESR
IN
S1
VV
V1R
fL V
⎛⎞
=×−×
⎜⎟
×⎝⎠
The characteristics of the output capacitor also
affect the stability of the regulation system.
PCB Recommendation of MP2143
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.
The high current paths (GND, IN, 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 IN 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.
8
7
6
5
L1
R4
R3
1
2
3
4
OUT
VIN
GND
SW
C1C1A
Figure 3: Layout Recommendation
MP2143 – 3A, 5.5V, 1.2MHz, 40μA IQ, COT SYNCHRONOUS STEP-DOWN SWITCHER
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TYPICAL APPLICATION CIRCUITS
MP2143
VIN 2.5-5.5V
R3
100k
R2
200k
R1
200k
R4
499k
U1 SW
VOUT
GND
1.2V @ 3A
C2A
NS
1206
IN
EN
PG
GND AGND
FB
OUT
SW
2
8
1
46
7
5
3
GND
EN
PG
VIN
Figure 4: MP2143 Typical Application Circuit
MP2143 – 3A, 5.5V, 1.2MHz, 40μA IQ, COT SYNCHRONOUS STEP-DOWN SWITCHER
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.
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PACKAGE INFORMATION
TSOT23-8
FRONT VIEW
NOTE:
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) PACKAGE LENGTH DOES NOT INCLUDE MOLD FLASH,
PROTRUSION OR GATE BURR.
3) PACKAGE WIDTH DOES NOT INCLUDE INTERLEAD
FLASH OR PROTRUSION.
4) LEAD COPLANARITY (BOTTOM OF LEADS AFTER
FORMING) SHALL BE 0.10 MILLIMETERS MAX.
5) JEDEC REFERENCE IS MO-193, VARIATION BA.
6) DRAWING IS NOT TO SCALE.
7) PIN 1 IS LOWER LEFT PIN WHEN READING TOP MARK
FROM LEFT TO RIGHT, (SEE EXAMPLE TOP MARK)
TOP VIEW RECOMMENDED LAND PATTERN
SEATING PLANE
SIDE VIEW
DETAIL ''A''
SEE DETAIL ''A''
PIN 1 ID
See note 7
EXAMPLE
TOP MARK
