MPS MP2130 High efficiency, 3.5a, 6v, 1.2mhz synchronous step-down converter in an ultraâ small qfn12 (2x2mm) package Datasheet

MP2130
The Future of Analog IC Technology
High Efficiency, 3.5A, 6V, 1.2MHz
Synchronous Step-Down Converter in an
Ultra–Small QFN12 (2x2mm) Package
DESCRIPTION
FEATURES
The MP2130 is a monolithic step-down switch
mode converter with built-in internal power
MOSFETs. It achieves 3.5A continuous output
current from a 2.7V to 6V input voltage with
excellent load and line regulation. The MP2130 is
ideal for powering portable equipment that runs
from a single cell Lithium-Ion (Li+) Battery. The
output voltage can be regulated as low as 0.6V.
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•
•
•
•
•
•
•
•
•
•
•
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The Constant-On-time (COT) control scheme
provides fast transient response high light-load
efficiency and easy loop stabilization.
Fault condition protection includes cycle-by-cycle
current limit and thermal shutdown.
The MP2130 requires a minimum number of readily
available standard external components and is
available in an ultra-small QFN12 (2x2mm)
package.
The MP2130 is ideal for a wide range of
applications including PDAs, portable instruments,
DVD drives, small handhold and battery–powered
devices.
•
Above 95% Peak Efficiency
Above 80% Light Load Efficiency.
Wide 2.7V to 6V Operating Input Range
Output Voltage as Low as 0.6V
100% Duty Cycle in Dropout
3.5A Output Current
50mΩ and 40mΩ Internal Power MOSFET
1.2MHz Frequency
EN and Power Good for Power Sequencing
Cycle-by-Cycle Over Current Protection
Auto Discharge at Power-off
Short Circuit Protection with Hiccup Mode
Thermal Shutdown
Stable with Low ESR Output Ceramic
Capacitors
Available in a QFN12 (2x2mm) Package
APPLICATIONS
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•
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Storage Drives
Portable/Handheld Devices
Wireless/Networking Cards
Low Voltage I/O System Power
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 Trademarks of Monolithic Power Systems,
Inc.
TYPICAL APPLICATION
Efficiency
VIN=5V
L
1
C1
22
10
SW
PVIN
VIN
OUT
2,11
PG
8
9
EN
FB
PG
NC
AGND PGND
4
3,12
VOUT
1.2V
6
MP2130
EN
1
7
5
C2
10
R1
200k
R2
200k
VO=3.3V
95
EFFICIENCY (%)
VIN
5V
100
VO=2.4V
90
85
VO=1.8V
80
75
VO=1.2V
70
0.01
MP2130 Rev. 1.23
11/22/2013
0.1
1
LOAD CURRENT (A)
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1
MP2130 – HIGH EFFICIENCY, 3.5A, 6V, 1.2MHz SYNCHRONOUS STEP-DOWN CONVERTER
ORDERING INFORMATION
Part Number
MP2130DG
Package
QFN12 (2x2mm)
Top Marking
AB
Free Air Temperature
-40°C to +85°C
* For Tape & Reel, add suffix –Z (e.g. MP2130DG–Z);
For RoHS Compliant Packaging, add suffix –LF (e.g. MP2130DG–LF–Z)
PACKAGE REFERENCE
TOP VIEW
VIN
PVIN
1
SW
2
PGND
3
AGND
4
10
11
SW
12
PGND
5
9
PG
8
EN
7
FB
6
OUT
NC
ABSOLUTE MAXIMUM RATINGS (1)
Supply Voltage VIN ...................................... 6.5V
VSW ........................ (-3V for <8ns) to (VIN + 0.3V)
All Other Pins ...............................-0.3V to +6.5V
Continuous Power Dissipation (TA = +25°C) (2)
............................................................. 1.6W
Junction Temperature ...............................150°C
Lead Temperature ....................................260°C
Storage Temperature............... -65°C to +150°C
Recommended Operating Conditions
(3)
Supply Voltage VIN .............................2.7V to 6V
Output Voltage VOUT ........................0.6V to 5.5V
Maximum Junction Temp. (TJ) .............. +125°C
MP2130 Rev. 1.23
11/22/2013
Thermal Resistance
(4)
θJA
θJC
QFN12 (2x2mm) .....................80 ...... 16 ... °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-toambient thermal resistance θJA, and the ambient temperature
TA. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by PD(MAX)=(TJ(MAX)TA)/ θJA. Exceeding the maximum allowable power 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.
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2
MP2130 – HIGH EFFICIENCY, 3.5A, 6V, 1.2MHz SYNCHRONOUS STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
VIN = 3.6V, TA = +25°C, unless otherwise noted.
Parameters
Symbol
Feedback Voltage
VFB
Feedback Current
PFET Switch On Resistance (5)
NFET Switch On Resistance (5)
IFB
RDSON_P
RDSON_N
Switch Leakage
PFET Current Limit
NFET Switch Sinking Current
On Time
On Time
Minimum Off Time
Soft-Start Time
Soft-Stop Time
EN Input Current
Supply Current (Shutdown)
Supply Current (Quiescent)
Thermal Shutdown
Thermal Hysteresis(5)
2.7V ≤ VIN ≤ 6V
VFB = 0.6V
VIN=3.6V
VIN=3.6V
VEN = 0V, VIN=6V,
VSW = 0V and 6V
Min
Typ
Max
Units
0.591
0.600
0.609
V
10
50
40
3.6
INSW
TON
VOUT=1.2V, VFB=0.7V
VIN = 5V, VOUT=1.2V
VIN=3.6V, VOUT=1.2V
TOFF
TSS-ON
TSS-OFF
FB with respect to the
Regulation
Power Good Upper Trip Threshold
Power Good Lower Trip Threshold
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
EN Input Logic Low Voltage
EN Input Logic High Voltage
Condition
VPG_LO
VPG_HI
Sink 1mA
VIN=5V, VFB=0.6V
nA
mΩ
mΩ
0
2
μA
4.5
100
200
277
30
1
1
6
A
μA
ns
ns
ns
ms
ms
+10
%
-10
90
%
μs
V
V
0.4
4.9
RPG
500
2.35
2.5
kΩ
2.65
400
mV
0.4
1.2
VEN = 2V
VEN = 0V
VEN = 0V
VEN = 2V, VFB = 0.63V,
VIN=3.6V
2
0
0
V
V
V
μA
μA
40
μA
150
30
°C
°C
Note:
5) Guaranteed by design.
MP2130 Rev. 1.23
11/22/2013
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3
MP2130 – HIGH EFFICIENCY, 3.5A, 6V, 1.2MHz SYNCHRONOUS STEP-DOWN CONVERTER
PIN FUNCTIONS
Pin #
Name
Description
1
2, 11
3, 12
4
5
6
PVIN
SW
PGND
AGND
NC
OUT
7
FB
8
EN
9
PG
10
VIN
Supply Voltage to power FETs. PVIN is connected to VIN internally.
Switch Output. Pin 2 and 11 can be connected together.
Power Ground. Pin 3 and 12 can be connected together.
Quiet ground for controller circuits
Leave this pin open. Do not connect it to ground.
Input sense pin for output voltage
Feedback. An external resistor divider from the output to GND, tapped to the FB pin,
sets the output voltage.
On/Off Control.
Power Good Indicator. The output of this pin is an open drain with internal pull up
resistor to IN. PG is pulled up to IN when the FB voltage is within 10% of the
regulation level, otherwise it is LOW.
Supply Voltage to internal control circuitry. VIN is connected to PVIN internally.
MP2130 Rev. 1.23
11/22/2013
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MP2130 – HIGH EFFICIENCY, 3.5A, 6V, 1.2MHz SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN=5V, VOUT=1.2V, L=1µH, COUT=10µF, TA = +25°C, unless otherwise noted
Quiescent Current vs.
Input Voltage
Shutdown Current vs.
Input Voltage
Load Regulation
0.5
100
0.6
0.45
0.4
60
40
0.35
ERROR (%)
CURRENT (µA)
CURRENT (µA)
80
0.3
0.25
0.2
0.15
0.1
20
3
3.5
4 4.5
5
INPUT VOLTAGE (V)
0
2.5
5.5
0
3 3.5 4 4.5 5 5.5
INPUT VOLTAGE (V)
-0.6
6 6.5
Case Temp Rise
100
1
30
95
0
IO=1.5A
-0.5
IO=3A
-1
-1.5
2.5
3 3.5 4 4.5 5 5.5 6 6.5
INPUT VOLTAGE (V)
25
EFFICIENCY (%)
IO=0.3A
20
15
10
0
0.5
1 1.5 2 2.5 3
LOAD CURRENT (A)
0
0.5
1 1.5 2 2.5 3
LOAD CURRENT (A)
3.5
3.5
VO=3.3V
VO=2.4V
90
85
VO=1.8V
80
75
5
0
VIN=4V
Efficiency
35
0.5
VIN=5V
-0.2
1.5
CASE TEMP RISE (oC)
REGULATION ERROR (%)
Line Regulation
0.2
-0.4
0.05
0
2.5
VIN=3V
0.4
VO=1.2V
70
0.01
0.1
1
LOAD CURRENT (A)
10
Efficiency
VIN=3.3V
100
EFFICIENCY (%)
95
90
VO=1.8V
85
VO=1.2V
80
75
70
0.010
0.100
1.000
10.000
OUTPUT CURRENT (A)
MP2130 Rev. 1.23
11/22/2013
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MP2130 – HIGH EFFICIENCY, 3.5A, 6V, 1.2MHz SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN=5V, VOUT=1.2V, L=1µH, COUT=10µF, TA = +25°C, unless otherwise noted.
Input and Output Ripple
Input and Output Ripple
Input and Output Ripple
IOUT = 0A
IOUT = 1.5A
IOUT = 3A
VOUT/AC
20mV/div.
VOUT/AC
100mV/div.
VOUT/AC
20mV/div.
VIN/AC
100mV/div.
VIN/AC
100mV/div.
SW
2V/div.
SW
2V/div.
SW
2V/div.
IL
2A/div.
IL
2A/div.
IL
2A/div.
VIN Power Up without Load
VIN/AC
100mV/div.
VIN Power Up with 3A Load
VIN Shut down without Load
VOUT
1V/div.
VOUT
1V/div.
VOUT
1V/div.
VIN
2V/div.
SW
2V/div.
VIN
2V/div.
SW
2V/div.
VIN
2V/div.
SW
2V/div.
IL
2A/div.
IL
2A/div.
IL
2A/div.
VIN Shut down with 3A Load
VOUT
1V/div.
VIN
2V/div.
SW
2V/div.
IL
2A/div.
MP2130 Rev. 1.23
11/22/2013
EN Start Up without Load
EN Shut Down without Load
VOUT
1V/div.
VOUT
1V/div.
EN
5V/div.
EN
5V/div.
SW
5V/div.
SW
5V/div.
IL
2A/div.
IL
2A/div.
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MP2130 – HIGH EFFICIENCY, 3.5A, 6V, 1.2MHz SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN=5V, VOUT=1.2V, L=1µH, COUT=10µF, TA = +25°C, unless otherwise noted.
EN Start Up with 3A Load
EN Shut Down with 3A Load
VOUT
1V/div.
VOUT
1V/div.
EN
5V/div.
EN
5V/div.
SW
5V/div.
SW
5V/div.
IL
2A/div.
IL
2A/div.
Power Good
Through EN Shut Down
EN
5V/div.
Power Good
Through EN Start Up
EN
5V/div.
VOUT
0.5V/div.
PG
5V/div.
Load Transient Response
Short Circuit Entry
IOUT = 1.5A to 3A
VOUT/AC
50mV/div.
VOUT
1V/div.
SW
5V/div.
VOUT
0.5V/div.
VIN
2V/div.
PG
5V/div.
IOUT
1A/div.
Short Circuit
Short Circuit Recovery
VOUT
1V/div.
SW
5V/div.
VOUT
1V/div.
SW
5V/div.
VIN
2V/div.
VIN
2V/div.
IL
5A/div.
IL
5A/div.
MP2130 Rev. 1.23
11/22/2013
IL
5A/div.
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MP2130 – HIGH EFFICIENCY, 3.5A, 6V, 1.2MHz SYNCHRONOUS STEP-DOWN CONVERTER
FUNCTIONAL BLOCKDIAGRAM
VIN
PVIN
Bias
&
Voltage
Reference
EN
Soft start /off
+
COMP
VTH
Lo-Iq
0.6V
RST
+
+ E.A.
-
Constant
On-Time
Pulse
Main
Switch
(PCH)
PDRV
PWM
PWM
+
Lo-Iq
+
FB
SW
EN
FBCOMP
Driver
VOUT
Lo-Iq
Ramp
generator
Synchronous
Rectifier
(NCH)
SW
Lo-Iq
Hi-Z
NDRV
OUT
PGND
IN
FB for
fixed output
0.66V
+
+
COMP
COMP
-
Lo-Iq
+
AGND
COMP
0.54V
PG
-
Figure 1—Functional Block Diagram
MP2130 Rev. 1.23
11/22/2013
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MP2130 – HIGH EFFICIENCY, 3.5A, 6V, 1.2MHz SYNCHRONOUS STEP-DOWN CONVERTER
OPERATION
MP2130 uses constant on-time control with
input voltage feed forward to stabilize the
switching frequency over full input range. At
light load, MP2130 employs a proprietary
control of low side switch and inductor current
to eliminate ringing on switching node and
improve efficiency.
Constant On-time Control
Compare to fixed frequency PWM control,
constant on-time control offers the advantage of
simpler control loop and faster transient response.
By using input voltage feed forward, MP2130
maintains a nearly constant switching frequency
across input and output voltage range. The ontime of the switching pulse can be estimated as:
TON =
VOUT
⋅ 0.833μs
VIN
To prevent inductor current run away during load
transient, MP2130 fixes the minimum off time to
be 30ns. However, this minimum off time limit will
not affect operation of MP2130 in steady state in
any way.
Light Load Operation
In light load condition, MP2130 uses a
proprietary control scheme to save power and
improve efficiency. Instead of turning off the low
side switch immediately when inductor current
start to reverse, MP2130 gradually ramp down
and regulates the low side switch current to a
minimal level, thus avoids the ringing at
switching node that always occurs in
discontinuous
conduction
mode
(DCM)
operation
Enable
When input voltage is greater than the undervoltage lockout threshold (UVLO), typically 2.5V,
MP2130 can be enabled by pulling EN pin to
higher than 1.2V. Leaving EN pin float or pull
down to ground will disable MP2130. There is
MP2130 Rev. 1.23
11/22/2013
an internal 1Meg Ohm resistor from EN pin to
ground.
Soft Start/Stop
MP2130 has built-in soft start that ramps up the
output voltage in a controlled slew rate,
avoiding overshoot at startup. The soft start
time is about 1ms typical. At disable, MP2130
ramps down the internal reference thus allow
the load to linearly discharge the output.
Power Good Indicator
MP2130 has an open drain with 500kΩ pull-up
resistor pin for power good indicator PG. When
FB pin is within +/-10% of regulation voltage, i.e.
0.6V, PG pin is pulled up to IN by the internal
resistor. If FB pin voltage is out of the +/-10%
window, PG pin is pulled down to ground by an
internal MOS FET. The MOS FET has a
maximum Rdson of less than 100Ω.
Current limit
MP2130 has a typical 4.5A current limit for the
high side switch. When the high side switch hits
current limit, MP2130 will touch the hiccup
threshold until the current lower down. This will
prevent inductor current from continuing to build
up which will result in damage of the
components.
Short Circuit and Recovery
MP2130 enters short circuit protection mode
when the inductor current hits the current limit,
and tries to recover from short circuit with
hiccup mode. In short circuit protection,
MP2130 will disable output power stage,
discharge soft-start cap and then automatically
try to soft-start again. If the short circuit
condition still holds after soft-start ends,
MP2130 repeats this operation cycle till short
circuit disappears and output rises back to
regulation level.
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9
MP2130 – HIGH EFFICIENCY, 3.5A, 6V, 1.2MHz SYNCHRONOUS STEP-DOWN CONVERTER
APPLICATION INFORMATION
COMPONENT SELECTION
Setting the Output Voltage
The external resistor divider is used to set the
output voltage (see Typical Application on page
1). The feedback resistor R1 can not be too
large neither too small considering the trade-off
for stability and dynamic. Choose R1 to be
around 120kΩ to 200kΩ. R2 is then given by:
R2 =
R1
Vout
−1
0.6
The feedback circuit is shown as Figure 2.
Vout
MP2130
R1
FB
Figure 2— Feedback Network
Table 1 lists the recommended resistors value
for common output voltages.
Table 1—Resistor Selection for Common
Output Voltages
R1 (kΩ)
200(1%)
200(1%)
200(1%)
200(1%)
200(1%)
R2 (kΩ)
300(1%)
200(1%)
100(1%)
63.2(1%)
44.2(1%)
Selecting the Inductor
A 0.82µH to 4.7µH inductor is recommended for
most applications. For highest efficiency, the
inductor DC resistance should be less than
15mΩ. For most designs, the inductance value
can be derived from the following equation.
L1 =
IL(MAX ) = ILOAD +
ΔI L
2
Selecting the Input Capacitor
The input current to the step-down converter is
discontinuous, therefore a capacitor is required 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
and small temperature coefficients. For most
applications, a 10µF capacitor is sufficient. For
higher output voltage, 47µF may be needed for
more stable system.
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:
R2
VOUT (V)
1.0
1.2
1.8
2.5
3.3
Choose inductor current to be approximately
30% of the maximum load current. The
maximum inductor peak current is:
I C1 = ILOAD ×
VOUT ⎛⎜ VOUT
× 1−
VIN ⎜⎝
VIN
⎞
⎟
⎟
⎠
The worse case condition occurs at VIN = 2VOUT,
where:
IC1 =
ILOAD
2
For simplification, choose the 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, a small and high quality ceramic
capacitor, i.e. 0.1μF, should be placed as close
to the IC as possible. When using ceramic
capacitors, make sure that they have enough
VOUT × (VIN − VOUT )
VIN × ΔIL × fOSC
Where ΔIL is the inductor ripple current.
MP2130 Rev. 1.23
11/22/2013
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MP2130 – HIGH EFFICIENCY, 3.5A, 6V, 1.2MHz SYNCHRONOUS STEP-DOWN CONVERTER
capacitance to provide sufficient charge to
prevent excessive voltage ripple at input. The
input voltage ripple caused by capacitance can
be estimated by:
⎛
⎞
I
V
V
ΔVIN = LOAD × OUT × ⎜ 1 − OUT ⎟
fS × C1 VIN ⎝
VIN ⎠
Selecting the Output Capacitor
The output capacitor (C2) is required to maintain
the DC output voltage.
Low ESR ceramic capacitors can be used with
MP2130 to keep the output ripple low. Generally,
10μF output ceramic capacitor is enough for
most of the cases. In higher output voltage
condition, 22μF might be needed for a stable
system.
Layout Recommendation of MP2130
Proper layout of the switching power supplies is
very important, and sometimes critical to make it
work properly. Especially, for the high switching
converter, if the layout is not carefully done, the
regulator could show poor line or load regulation,
stability issues.
For MP2130, the high speed step-down regulator,
the input capacitor should be placed as close as
possible to the IC pins. As shown in Figure 6, the
0805 size ceramic capacitor is used, please
make sure the two ends of the ceramic capacitor
be directly connected to PIN1 (the Power Input
Pin) and PIN 3 (the Power GND Pin).
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 =
⎛ V ⎞
VOUT
× ⎜ 1 − OUT ⎟
VIN ⎠
8 × fS 2 × L1 × C2 ⎝
In the case of tantalum or electrolytic capacitors,
the ESR dominates the impedance at the
switching frequency. For simplification, the output
ripple can be approximated to:
ΔVOUT =
VOUT ⎛
V
× 1 − OUT
fS × L1 ⎜⎝
VIN
⎞
⎟ × RESR
⎠
The characteristics of the output capacitor also
affect the stability of the regulation system.
Figure 5—Two Ends off Input Decoupling
Capacitor Close to Pin 1 and Pin 3
MP2130 Rev. 1.23
11/22/2013
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MP2130 – HIGH EFFICIENCY, 3.5A, 6V, 1.2MHz SYNCHRONOUS STEP-DOWN CONVERTER
PACKAGE INFORMATION
QFN12 (2x2mm)
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.
MP2130 Rev. 1.22
11/22/2013
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