MP2127
2.7-6V Input, 2A, 1.2MHz
Synchronous Step-Down Converter
The Future of Analog IC Technology
DESCRIPTION
The MP2127 is a fully integrated, internally
compensated 1.2MHz fixed frequency PWM
step-down converter. It is ideal for powering
portable equipment that runs from a single cell
Lithium-Ion (Li+) Battery, with an input range
from 2.7V to 6V. The MP2127 can provide up to
2A of load current with output voltage as low as
0.8V. It can also operate at 100% duty cycle for
low dropout applications. With peak current
mode control and internal compensation, the
MP2127 is stable with ceramic capacitors and
small inductors. Fault condition protection
includes cycle-by-cycle current limiting and
thermal shutdown.
MP2127 is available in
3mmx3mm QFN package.
the
small
6-pin
FEATURES
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Output Adjustable from 0.8V to VIN
Up to 95% Efficiency
100% Duty Cycle for Low Dropout
Applications
Power Good Indicator Output
1.2MHz Fixed Switching Frequency
Stable with Low ESR Output Ceramic
Capacitors
Thermal Shutdown
Cycle-by-Cycle Over Current Protection
Short circuit protection
2.7V-6V Input Operation Range
Available in 6-pin 3x3mm QFN
Smart Phones, PDA’s
DVD+/-RW Drives
Digital Cameras
Portable Instruments
APPLICATIONS
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
R3
100k
6V
4
PVIN
PGOOD
6
L1
3.3
FB 1
R1
20k
C1
33
PGOOD
V
OUT
1.2V/2A
Efficiency vs.
Load Current
100
90
VIN=3V
VIN=5V
80
70
60
50
40
30
20
10
0
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
V
IN
2.7V
5
C1
10
VIN
MP2127
SW
3
2
GND
R2
40k
EFFICIENCY (%)
LOAD CURRENT(A)
MP2127 Rev. 0.91
www.MonolithicPower.com
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4/19/2010
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© 2010 MPS. All Rights Reserved.
MP2127 – 2.7-6V, 2A, 1.2MHZ SYNCHRONOUS STEP-DOWN CONVERTER
ORDERING INFORMATION
Part Number*
MP2127DQ
Package
QFN6 (3mm x 3mm)
Top Marking
8G
Temperature
–40°C to +85°C
* For Tape & Reel, add suffix –Z (e.g. MP2127DQ–Z).For RoHS compliant packaging, add suffix –LF (e.g.
MP2127DQ–LF–Z)
PACKAGE REFERENCE
TOP VIEW
FB
1
6
PGOOD
GND
2
5
VIN
SW
3
4
PVIN
ABSOLUTE MAXIMUM RATINGS
(1)
PVIN, VIN to GND......................–0.3V to + 7.0V
SW to GND .......................... –0.3V to V
IN
+ 0.3V
EN, FB to GND ...........................–0.3V to +6.5V
Operating Temperature............. –40°C to +85°C
Continuous Power Dissipation…(T
A
= +25°C)
(2)
………………………………………………....2.5W
Junction Temperature ...............................150°C
Lead Temperature ....................................260°C
Storage Temperature ............. –65°C to +150°C
Recommended Operating Conditions
(3)
Supply Voltage V
IN
.............................2.7V to 6V
Operating Temperature............. –40°C to +85°C
Thermal Resistance
(4)
QFN6 (3mm x 3mm) ...............50 ...... 12 ...
°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 T
J
(MAX), the junction-to-
ambient thermal resistance
θ
JA
, and the ambient temperature
T
A
. The maximum allowable continuous power dissipation at
any ambient temperature is calculated by P
D
(MAX) = (T
J
(MAX)-T
A
)/θ
JA
. 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.
θ
JA
θ
JC
MP2127 Rev. 0.91
www.MonolithicPower.com
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4/19/2010
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
MP2127 – 2.7-6V, 2A, 1.2MHZ SYNCHRONOUS STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
(5)
V
IN
= 3.6V, T
A
= +25°C, unless otherwise noted.
Parameters
Supply Current
Thermal
Shutdown
Trip
Threshold
IN Undervoltage Lockout
Threshold
IN Undervoltage Lockout
Hysteresis
Regulated FB Voltage
FB Input Bias Current
SW PFET On Resistance
SW NFET On Resistance
SW Leakage Current
SW PFET Peak Current
Limit
Switching Frequency
OVP threshold (PGOOD
Output High)
OVP
threshold
(Fault
Detected)
OVP Hysteresis
PGOOD, Output High
PGOOD, Output Low
PGOOD output low voltage
PGOOD Deglitch Time
Line Regulation
Load Regulation
Symbol
I
IN
T
SD
INUV
VTH
INUV
HYS
V
FB
I
FB
HS
RDS-ON
LS
RDS-ON
SW
HS-LKG
SW
LS-LKG
I
LIMIT
F
SW
V
FB OVP-
V
FB OVP+
V
FB OVP+
V
FB OVP-
V
FB
ramps up from
nominal operating point
V
FB
ramps up from
nominal operating point
V
FB
V
FB
25
Ramp up V
FB
, starting at
V
FB
≤700mV
Ramp down V
FB
,starting at
V
FB
= V
FB nom
ISINK = 6mA
4.5V≤V
IN
≤5.5V,
I
OUT
=100mA
0A
≤I
OUT
≤
2A
94%
98.5%
95%
0.4
160
0.1
0.1
T
A
= +25°C
-40°C≤ T
A
≤
+85°C
V
FB
= 0.9V
I
SW
= 100mA
I
SW
= -100mA
V
EN
=0V; V
IN
=6V
V
SW_
=0V
V
EN
=0V; V
IN
=6V; V
SW
=6V
Duty Cycle=100%
Duty Cycle=50%
(6)
0.784
0.776
-50
0.19
0.16
-1
-5
2.2
2.5
1.0
103%
111%
Condition
V
EN_
= V
IN
, V
FB
= 0.9V
Hysteresis = 20°C
Rising Edge
2.15
Min
Typ
500
150
2.40
160
0.800
0.800
-2
0.23
0.2
0.1
1.5
3.0
3.5
1.2
0.816
0.824
+50
0.27
0.24
1
5
3.8
4.5
1.4
2.65
Max
750
Units
μA
°C
V
mV
V
nA
Ω
Ω
μA
A
MHz
V
FB
V
FB
mV
V
FB
V
FB
V
μs
%
%
Notes:
5)
Production test at +25°C. Specifications over the temperature range are guaranteed by design and characterization.
6)
Guaranteed by design
MP2127 Rev. 0.91
www.MonolithicPower.com
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4/19/2010
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
MP2127 – 2.7-6V, 2A, 1.2MHZ SYNCHRONOUS STEP-DOWN CONVERTER
PIN FUNCTIONS
Pin #
1
Name
FB
Description
Feedback input. An external resistor divider from the output to GND, tapped to the FB pin
sets the output voltage.
Ground pin. This pin is the reference ground of the regulated output voltage.
For this reason care must be taken in PCB layout. Suggested to be connected to
GND with copper and vias. Connect exposed pad to ground plane for proper thermal
performance.
Switch node to the inductor
Input supply pin for power FET
Input Supply pin for controller
Power-good indicator output. “Low” output indicates output is outside the window of
regulation level. PGOOD is pulled down in shutdown. PGOOD output has 160us deglitch
timer to avoid false trigger during transient response.
2
3
4
5
6
GND
SW
PVIN
VIN
PGOOD
MP2127 Rev. 0.91
www.MonolithicPower.com
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4/19/2010
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
MP2127 – 2.7-6V, 2A, 1.2MHZ SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
V
IN
= 5V, V
OUT
= 1.2V, T
A
= +25ºC, unless otherwise noted.
Efficiency vs. Load Current
100
90
80
VIN=3V
VIN=5V
Enabled Supply Current
vs. Input Voltage
660
640
620
Case Tem perature Rise
vs. Output Current
CASE TEMPERATURE RISE (
O
C)
40
35
30
25
20
15
10
5
0
0
0.5
1
1.5
2
OUTPUT CURRENT (A)
680
EFFICIENCY (%)
70
60
50
40
30
20
10
0
I
IN
(uA)
600
580
560
540
520
500
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
0
2
4
V
IN
(V)
6
8
LOAD CURRENT(A)
Load Regulation
NORMALIZED OUTPUT VOLTAGE (%)
NORMALIZED OUTPUT VOLTAGE (%)
0.20
0.16
0.12
0.08
0.04
0.00
-0.04
-0.08
-0.12
-0.16
-0.20
0
0.5
1
1.5
2
VIN=3V
VIN=5V
Line Regulation
0.20
0.15
0.10
0.05
0.00
-0.05
-0.10
-0.15
-0.20
2
3
4
5
6
7
INPUT VOLTAGE (V)
3
IO=2A
IO=1A
IO=0A
Ipeak vs. Duty
4.2
3.9
IPEAK (A)
3.6
3.3
0%
20%
40%
60%
80% 100%
LOAD CURRENT(A)
DUTY CYCLE
MP2127 Rev. 0.91
www.MonolithicPower.com
5
4/19/2010
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
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