MP1475
High-Efficiency, 3A, 16V, 500kHz
Synchronous, Step-Down Converter
The Future of Analog IC Technology
DESCRIPTION
The MP1475 is a high-frequency, synchronous,
rectified, step-down, switch-mode converter
with built-in power MOSFETs. It offers a very
compact solution to achieve a 3A continuous
output current with excellent load and line
regulation over a wide input supply range. The
MP1475 has synchronous mode operation for
higher efficiency over the output current load
range.
Current-mode operation provides fast transient
response and eases loop stabilization.
Full protection features include over-current
protection and thermal shut down.
The MP1475 requires a minimal number of
readily-available standard external components,
and is available in a space-saving 8-pin
TSOT23 package.
FEATURES
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Wide 4.5V-to-16V Operating Input Range
80mΩ/30mΩ Low R
DS(ON)
Internal Power
MOSFETs
High-Efficiency Synchronous Mode
Operation
Fixed 500kHz Switching Frequency
Synchronizes from a 200kHz-to-2MHz
External Clock
Power-Save Mode at light load
Internal Soft-Start
Power Good Indicator
OCP Protection and Hiccup
Thermal Shutdown
Output Adjustable from 0.8V
Available in an 8-pin TSOT-23 Package
Notebook Systems and I/O Power
Digital Set-Top Boxes
Flat-Panel Television and Monitors
Distributed Power Systems
APPLICATIONS
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 Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
MP1475 Rev. 1.01
4/3/2014
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
1
MP1475 – SYNCHRONOUS STEP-DOWN CONVERTER
ORDERING INFORMATION
Part Number*
MP1475DJ
Package
TSOT-23-8
Top Marking
ADP
*
For Tape & Reel, add suffix –Z (e.g. MP1475DJ–Z);
For RoHS Compliant Packaging, add suffix –LF (e.g. MP1475DJ–LF–Z)
PACKAGE REFERENCE
TOP VIEW
PG
IN
SW
GND
1
2
3
4
8
7
6
5
FB
VCC
EN/SYNC
BST
ABSOLUTE MAXIMUM RATINGS
(1)
V
IN
................................................ -0.3V to 17V
V
SW
....................................................................
-0.3V (-5V for <10ns) to 17V (19V for <10ns)
V
BST
...................................................... V
SW
+6V
All Other Pins................................ -0.3V to 6V
(2)
(3)
Continuous Power Dissipation (T
A
= +25°C)
..........................................................1.25W
Junction Temperature.............................. 150°C
Lead Temperature ................................... 260°C
Storage Temperature................. -65°C to 150°C
Thermal Resistance
(5)
θ
JA
θ
JC
TSOT-23-8 ............................ 100 ..... 55... °C/W
Notes:
1) Exceeding these ratings may damage the device.
2) About the details of EN pin’s ABS MAX rating, please refer to
Page 9, Enable/SYNC control section.
3) 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.
4) The device is not guaranteed to function outside of its
operating conditions.
5) Measured on JESD51-7, 4-layer PCB.
Recommended Operating Conditions
(4)
Supply Voltage V
IN
.......................... 4.5V to 16V
Output Voltage V
OUT
............... 0.8V to V
IN
x D
MAX
Operating Junction Temp. (T
J
). -40°C to +125°C
MP1475 Rev. 1.01
4/3/2014
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
2
MP1475 – SYNCHRONOUS STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
(6)
V
IN
= 12V, T
A
= 25°C, unless otherwise noted.
Parameter
Supply Current (Shutdown)
Supply Current (Quiescent)
HS Switch-On Resistance
LS Switch-On Resistance
Switch Leakage
(6)
Current Limit
Oscillator Frequency
Fold-Back Frequency
Maximum Duty Cycle
(6)
Minimum On Time
Sync Frequency Range
Feedback Voltage
Feedback Current
EN Rising Threshold
EN Falling Threshold
EN Input Current
EN Turn-Off Delay
Power-Good Rising Threshold
Power-Good Falling Threshold
Power-Good Delay
Power-Good Sink Current
Capabilily
Power-Good Leakage Current
VIN Under-Voltage Lockout
Threshold-Rising
VIN Under-Voltage Lockout
Threshold-Hysteresis
VCC Regulator
VCC Load Regulation
Soft-Start Period
(6)
Thermal Shutdown
Thermal Hysteresis
(6)
Symbol
I
IN
I
q
HS
RDS-ON
LS
RDS-ON
SW
LKG
I
LIMIT
f
SW
f
FB
D
MAX
τ
ON_MIN
f
SYNC
V
FB
I
FB
V
EN_RISING
V
EN_FALLING
I
EN
EN
td-off
PG
vth-Hi
PG
vth-Lo
PG
Td
V
PG
I
PG-LEAK
INUV
Vth
INUV
HYS
V
CC
Condition
V
EN
= 0V
V
EN
= 2V, V
FB
= 1V
V
BST-SW
=5V
V
CC
=5V
V
EN
= 0V, V
SW
=12V
Under 40% Duty Cycle
V
FB
=0.75V
V
FB
<400mV
V
FB
=700mV
Min
Typ
7
0.6
80
30
Max
1
Units
μA
mA
mΩ
mΩ
μA
A
kHz
f
SW
%
ns
MHz
mV
nA
V
V
μA
μA
μs
V
FB
V
FB
ms
1
4.2
430
90
0.2
791
5
500
0.25
95
40
807
807
10
1.4
1.25
2
0
5
0.9
0.85
0.4
2
823
827
50
1.6
1.4
570
T
A
=25°C
-40°C<T
A
<85°C
V
FB
=820mV
(7)
787
1.2
1.1
V
EN
=2V
V
EN
=0
Sink 4mA
0.4
1
3.7
3.9
650
4.1
V
μA
V
mV
V
%
ms
°C
°C
I
CC
=5mA
τ
SS
5
3
1.2
150
20
Notes:
6) Guaranteed by design.
7) Not tested in production and guaranteed by over-temperature correlation.
MP1475 Rev. 1.01
4/3/2014
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
3
MP1475 – SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL CHARACTERISTICS
V
IN
= 12V, V
OUT
= 3.3V, L=4.7μH, T
A
= 25°C, unless otherwise noted.
MP1475 Rev. 1.01
4/3/2014
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
4
MP1475 – SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
Performance waveforms are tested on the evaluation board of the Design Example section.
V
IN
= 12V, V
OUT
= 3.3V, L=4.7μH, T
A
= 25°C, unless otherwise noted.
MP1475 Rev. 1.01
4/3/2014
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
5
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