MP4470/4470A
High-Efficiency, Fast-Transient, 5A, 36V
Synchronous, Step-Down Converter
DESCRIPTION
FEATURES
The MP4470/4470A is a fully-integrated, highfrequency, synchronous, rectified, step-down,
switch-mode converter. It offers a very compact
solution to achieve a 5A, continuous-output
current over a wide input-supply range with
excellent load and line regulation. It also
provides fast transient response and good
stability for wide input-supply and load range.
The MP4470/4470A operates at high efficiency
over a wide output current load range.
MP4470 has full protection features include
SCP, OCP, OVP latch, UVP, and thermal
shutdown. MP4470A has the same protection
features to MP4470 except has no OVP latch
function.
The MP4470/4470A requires a minimal number
of
readily-available,
standard,
external
components, and is available in a space-saving
3mm×4mm, 20-pin, QFN package.
Wide 4.5V-to-36V Operating Input Range
Guaranteed 5A, Continuous Output Current
Internal 40mΩ High-Side, 20mΩ Low-Side
Power MOSFETs
Proprietary Switching-Loss-Reduction
Technology
1% Reference Voltage
Programmable Soft-Start Time
Low Drop-out Mode
200kHz-to-1MHz Switching Frequency
SCP, OCP, OVP Latch(MP4470 only), UVP,
and Thermal Shutdown
Output Adjustable from 0.8V to 0.9×VIN
Available in a 3×4mm 20-pin QFN Package
APPLICATIONS
Notebook Systems and I/O Power
Automotive Systems
Networking Systems
Industrial Supplies
Optical Communications Systems
Distributed Power and POL Systems
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
MP4470/4470A Rev. 1.11
www.MonolithicPower.com
5/1/2018
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
1
MP4470/4470A–HIGH-EFFICIENCY, FAST-TRANSIENT, SYNCHRONOUS, STEP-DOWN CONVERTER
ORDERING INFORMATION
Part Number*
Package
Top Marking
MP4470GL
MP4470AGL
QFN20 (3×4mm)
QFN20 (3×4mm)
4470
4470A
* For Tape & Reel, add suffix –Z (e.g. MP4470/4470AGL–Z)
PACKAGE REFERENCE
QFN20 (3×4mm)
ABSOLUTE MAXIMUM RATINGS (1)
Supply Voltage VIN ....................................... 40V
VSW ........................................ -0.3V to VIN + 0.3V
VBST ...................................................... VSW + 6V
VPGOOD .................................... -0.3V to VCC+0.6V
All Other Pins ..................................-0.3V to +6V
Continuous Power Dissipation (TA = +25°C) (2)
………………………………… …………….2.6W
Operating Junction Temperature ..............150°C
Lead Temperature ....................................260°C
Storage Temperature ............... -65°C to +150°C
Recommended Operating Conditions
(3)
Thermal Resistance (4)
θJA
θJC
QFN20 (3×4mm) ..................... 48 ...... 10 ... °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.
Supply Voltage VIN ........................... 4.5V to 36V
Output Voltage VOUT ................... 0.8V to 0.9×VIN
Operating Junction Temp. (TJ). -40°C to +125°C
MP4470/4470A Rev. 1.11
www.MonolithicPower.com
5/1/2018
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
2
MP4470/4470A–HIGH-EFFICIENCY, FAST-TRANSIENT, SYNCHRONOUS, STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
VIN = 24V, VEN = 2V, TA = +25°C, unless otherwise noted.
Parameters
Supply Current (Shutdown)
Supply Current (Quiescent)
HS Switch On Resistance
LS Switch On Resistance (5)
Switch Leakage
Current Limit
Symbol
IIN
IIN
HSRDS-ON
LSRDS-ON
SWLKG
tON
Minimum Off Time(5)
tOFF
Foldback Off Time(5)
tFB
Foldback Off Time(5)
tFB
tOC
VFB
IFB
ISS
PGVth-Hi
PGVth-Lo
PGVth-Hys
tPG
ENVth-Hi
ENVth-Lo
ENVth-Hys
IEN
Min
VEN = 0V
VSW = 0V or 36V
ILIMIT
One-Shot On Time
OCP Hold-Off Time(5)
Feedback Voltage
Feedback Current
Soft-Start Charging Current
Power-Good Rising Threshold
Power-Good Falling Threshold
Power-Good Threshold Hysteresis
Power-Good Rising Delay
EN Rising Threshold
EN Falling Threshold
EN Threshold Hysteresis
EN Input Current
VIN Under-Voltage Lockout
Threshold Rising
VIN Under-Voltage Lockout
Threshold Hysteresis
VCC Regulator
VCC Load Regulation
Vo Over-Voltage Protection
Threshold (6)
Thermal Shutdown(5)
Thermal Shutdown Hysteresis(5)
Condition
VEN = 0V
VFB = 0.95V
VIN=12V,
RFREQ=30kΩ
10
200
nA
230
280
6
0.87
0.82
500
1.1
0.8
VEN = 2V
3.7
INUVHYS
VCC
Units
nA
μA
mΩ
mΩ
8
807
INUVVth
Max
200
600
55
6
ILIM=1(HIGH),
VFB>50%VREF
ILIM=1(HIGH),
VFB
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