MP2171
5.5V, 1A, 2.6MHz,
Synchronous, Step Down Converter
The Future of Analog IC Technology
DESCRIPTION
The MP2171 is a monolithic, step-down, switch-
mode converter with integrated, internal, power
MOSFETs. The MP2171 can achieve up to 1A
of 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 (COT) control provides fast
transient response and eases loop stabilization.
Full protection features include cycle-by-cycle
current limiting and thermal shutdown.
The MP2171 is ideal for a wide range of
applications, including automotive infotainment,
clusters, telematics, and portable instruments.
The MP2171 requires only a minimal number of
readily
available,
standard,
external
components and is available in a small
TSOT23-8 package.
FEATURES
Wide 2.5V to 5.5V Operating Input Range
Output Voltage as Low as 0.6V
100% Duty Cycle in Dropout
Up to 1A Output Current
90mΩ and 50mΩ Internal Power MOSFET
Switches
Default 2.6MHz Switching Frequency with
3.3V Input and 1.8V Output
EN and Power Good for Power Sequencing
Cycle-by-Cycle Over-Current Protection
(OCP)
Auto-Discharge at Power-Off
Short-Circuit Protection (SCP) with Hiccup
Mode
Stable with Low ESR Output Ceramic
Capacitors
Available in a TSOT23-8 Package
Automotive Infotainment
Automotive Clusters
Automotive Telematics
Low-Voltage I/O System Power
Handheld/Battery-Powered Systems
APPLICATIONS
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
Efficiency
V
IN
= 3.3V
100
90
80
70
60
50
40
30
20
10
0
0.01
EFFICIENCY (%)
Vo=1.2V
Vo=1.8V
0.1
OUTPUT CURRENT (A)
1
MP2171 Rev. 1.0
4/24/2019
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2019 MPS. All Rights Reserved.
1
MP2171 – 5.5V, 1A, 2.6MHz, SYNCHRONOUS STEP-DOWN SWITCHER
ORDERING INFORMATION
Part Number *
MP2171GJ
Package
TSOT23-8
Top Marking
See Below
* For Tape & Reel, add suffix –Z (e.g.: MP2171GJ–Z).
TOP MARKING
BAZ: Product code of MP2171GJ
Y: Year code
PACKAGE REFERENCE
TOP VIEW
PG
VIN
SW
PGND
1
2
3
4
8
7
6
5
EN
FB
AGND
OUT
TSOT23-8
ABSOLUTE MAXIMUM RATINGS
(1)
Supply voltage (V
IN
) ........................................ 6V
V
SW
.................................... -0.3V (-5V for <10ns)
to V
IN
+ 0.3V (8V for <10ns)
All other pins ................................... -0.3V to +6V
Junction temperature ................................ 150°C
Lead temperature...................................... 260°C
Continuous power dissipation (T
A
= 25°C)
(2)
................................................................... 1.25W
Storage temperature .................-65°C to +150°C
Thermal Resistance
(4)
θ
JA
θ
JC
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 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 produces an excessive die temperature, causing
the device to 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.
Recommended Operating Conditions
(3)
Supply voltage (V
IN
) ........................ 2.5V to 5.5V
Output voltage (V
OUT
) .............. 0.6V to V
IN
- 0.5V
Operating junction temp. (T
J
). ...-40°C to +125°C
MP2171 Rev. 1.0
4/24/2019
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2019 MPS. All Rights Reserved.
2
MP2171 – 5.5V, 1A, 2.6MHz, SYNCHRONOUS STEP-DOWN SWITCHER
ELECTRICAL CHARACTERISTICS
Parameter
Quiescent current
Supply current (shutdown)
Feedback voltage
Feedback current
P-FET switch on resistance
N-FET switch on resistance
Switch leakage
P-FET current limit
Symbol
I
Q
I
SHDN
V
FB
I
FB
R
DSON_P
R
DSON_N
V
IN
= 5V, T
J
= -40°C to +125°C
(6)
, unless otherwise noted, typical values are at T
J
= +25°C.
Condition
V
IN
= 5V, V
EN
= 2V,
V
FB
= 0.63V, no switching
V
EN
= 0V, T
J
= +25°C
V
EN
= 0V, T
J
= -40°C to +125°C
T
J
= +25°C
T
J
= -40°C to +125°C
V
FB
= 0.63V
Min
Typ
520
0.1
0.1
600
600
10
90
50
0.1
0.1
3
135
190
95
130
1850
2000
1850
1850
4
150
210
110
150
2400
2600
2200
2380
60
30
0.6
0.4
110
105
1.3
0.9
115
110
5
FB rising when PG turns to high
voltage
FB falling when PG turns to
high voltage
85
80
90
85
5
95
90
Max
720
2
35
609
612
100
135
83
2
μA
35
6
180
270
130
190
2700
2800
2500
2700
90
50
2.2
1.6
120
115
ns
ns
ms
ms
%
%
%
%
%
%
A
Units
μA
μA
mV
nA
mΩ
mΩ
591
588
On time
t
ON
V
EN
= 0V, V
IN
= 5V, V
SW
= 0V
and 5V, T
J
= +25°C
V
EN
= 0V, V
IN
= 5V, V
SW
= 0V
and 5V, T
J
= -40°C to +125°C
T
J
= +25°C
V
IN
= 3.3V, V
OUT
= 1.2V
V
IN
= 3.3V, V
OUT
= 1.8V
V
IN
= 5V, V
OUT
= 1.2V
V
IN
= 5V, V
OUT
= 1.8V
V
IN
= 3.3V, V
OUT
= 1.2V
V
IN
= 3.3V, V
OUT
= 1.8V
V
IN
= 5V, V
OUT
= 1.2V
V
IN
= 5V, V
OUT
= 1.8V
V
IN
= 3.3V, V
OUT
= 1.2V
V
IN
= 3.3V, V
OUT
= 1.8V
V
IN
= 5V, V
OUT
= 1.2V
V
IN
= 5V, V
OUT
= 1.8V
V
IN
= 3.6V, V
OUT
= 1.5V, 10% to
90%
V
IN
= 3.6V, V
OUT
= 1.5V, 90% to
10%
FB rising when PG turns to high
voltage
FB falling when PG turns to
high voltage
ns
Switching frequency
f
s
kHz
Minimum off time
t
MIN-OFF
Soft-start time
(5)
Soft-stop time
(5)
Power good upper trip
threshold rising
Power good upper trip
threshold falling
Power good upper trip
hysteresis
Power good lower trip
threshold rising
Power good lower trip
Threshold falling
Power good lower trip
hysteresis
t
SS-ON
t
SS-OFF
PG
H-R
PG
H-F
PG
H-Hys
PG
L-R
PG
L-F
PG
L-Hys
MP2171 Rev. 1.0
4/24/2019
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2019 MPS. All Rights Reserved.
3
MP2171 – 5.5V, 1A, 2.6MHz, SYNCHRONOUS STEP-DOWN SWITCHER
ELECTRICAL CHARACTERISTICS
(continued)
Parameter
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
EN input current
Thermal shutdown
(5)
Thermal hysteresis
(5)
NOTE:
5) Not tested in production and guaranteed by design and characterization.
6) Not tested in production and guaranteed by over-temperature correction.
V
IN
= 5V, T
J
= -40°C to +125°C
(6)
, unless otherwise noted, typical values are at T
J
= +25°C.
Symbol Condition
PG
D
V
PG-L
V
PG-H
R
PG
Sink 1mA
V
IN
= 5V, V
FB
= 0.6V
4.85
200
2.0
500
2.2
150
0.4
1.2
V
EN
= 0V
V
EN
= 2V
0.1
2
170
30
0.2
4
800
2.4
Min
30
Typ
110
250
Max
200
400
Units
μs
mV
V
kΩ
V
mV
V
V
μA
μA
°C
°C
MP2171 Rev. 1.0
4/24/2019
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2019 MPS. All Rights Reserved.
4
MP2171 – 5.5V, 1A, 2.6MHz, SYNCHRONOUS STEP-DOWN SWITCHER
TYPICAL PERFORMANCE CHARACTERISTICS
V
IN
= 3.3V, V
OUT
= 1.2V, L = 1μH, C
OUT
= 22μF, T
A
= +25°C, unless otherwise noted.
Efficiency
V
IN
= 3.3V
100
90
80
100
90
80
Efficiency
V
IN
= 5V
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0.01
0.1
OUTPUT CURRENT (A)
Vo=1.2V
Vo=1.8V
1
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0.01
0.1
OUTPUT CURRENT (A)
Vo=1.8V
Vo=1.2V
1
Load Regulation
0.4
LOAD REGULATION (%)
0.4
Line Regulation
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
2
3
4
5
INPUT VOLTAGE (V)
Io=1A
Io=0A
6
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
0
0.2
0.4
0.6
Vo=1.2V
Vo=1.8V
0.8
1
LINE REGULATION (%)
OUTPUT CURRENT (A)
Case Temperature Rise
V
IN
= 3.3V
CASE TEMPRETURE RISE (°C)
10
8
0.5
0.4
Shutdown Current vs. Input Voltage
CURRENT (μA)
Vo=1.2V
Vo=1.8V
0
0.2
0.4
0.6
0.8
1
6
4
2
0
0.3
0.2
0.1
0
2
2.5
3
3.5
4
4.5
5
5.5
6
INPUT VOLTAGE (V)
OUTPUT CURRENT (A)
MP2171 Rev. 1.0
4/24/2019
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2019 MPS. All Rights Reserved.
5
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