The Future of Analog IC Technology
High Efficiency, Fast Transient, 10A, 16V
Synchronous Step-down Converter
In a Tiny QFN20 (3x4mm) Package
FEATURES
Wide 4.5V to 16V Operating Input Range
10A Output Current
Internal 27mΩ High-Side, 10mΩ Low-Side
Power MOSFETs
Proprietary Switching Loss Reduction
Technique
1% Reference Voltage
Programmable Soft Start Time
Soft Shutdown (MP38900,)
High-Z Shutdown (MP38900-B)
Programmable Switching Frequency
SCP, OCP, OVP, UVP Protection and
Thermal Shutdown
Output Adjustable from 0.8V to 13V
Available in a QFN20 (3x4mm) Package
Notebook Systems and I/O Power
Networking Systems
Optical Communication Systems
Distributed Power POL Systems
MP38900/MP38900-B
DESCRIPTION
The MP38900/MP38900-B is a fully integrated,
high frequency synchronous rectified step-down
switch mode converter. It offers a very compact
solution to achieve 10A continuous output current
over a wide input supply range with excellent
load and line regulation. The
MP38900/
MP38900-B operates at high efficiency over a
wide output current load range.
The table below summarizes the variations
among the MP38900 and the MP38900-B.
MP38900
MP38900-B
External
V
CC
Built-in V
CC
OCP
Latch Off
OCP
Hiccup
Soft SHDN
Hi-Z SHDN
To futher optimize efficiency at light load, the V
CC
supply of MP38900 is designed to be biased
externally.
Constant-On-Time (COT) control mode provides
fast transient response and eases loop
stabilization.
Full protection features include SCP, OCP, OVP,
UVP and thermal shutdown.
The MP38900/MP38900-B requires a minimum
number of readily available standard external
components and is available in a space-saving
QFN20 (3x4mm) package.
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.
MP38900/MP38900-B Rev. 1.1
www.MonolithicPower.com
6/25/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
1
MP38900/MP38900-B – HIGH EFFICIENCY, FAST TRANSIENT SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL APPLICATION
U1
8,19
VIN
R5
100k
VCC
IN
BST
7
R3
4.7
R7
174k
2
20
MP38900
SW
FREQ
VCC
9,10,17,18
VOUT
1.05V
R4
360k
C4
220pF
R1
12.1k
GND
6
PGOOD
EN
SS
4
EN
5
FB
AGND PGND
3
R2
43.2k
C6
33nF
1
11-16
MP38900/MP38900-B Rev. 1.1
www.MonolithicPower.com
6/25/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
2
MP38900/MP38900-B – HIGH EFFICIENCY, FAST TRANSIENT SYNCHRONOUS STEP-DOWN CONVERTER
ORDERING INFORMATION
Part Number
MP38900DL*
MP38900DL-B***
Package
QFN20 (3x4mm)
QFN20 (3x4mm)
Top Marking
38900
38900B
*
For Tape & Reel, add suffix –Z (e.g. MP38900DL–Z)
For RoHS compliant packaging, add suffix –LF (e.g. MP38900DL–LF–Z)
***For Tape & Reel, add suffix –Z (e.g. MP38900DL-B–Z)
For RoHS compliant packaging, add suffix –LF (e.g. MP38900DL-B–LF–Z)
PACKAGE REFERENCE
TOP VIEW
VCC
20
AGND
FREQ
FB
SS
EN
PGOOD
1
2
3
IN
4
SW
5
IN
6
7
8
9
10
BST IN SW SW
EXPOSED PAD
ON BACKSIDE
11
PGND
13
12
PGND
PGND
IN
SW
IN
19
SW SW
18
17
16
15
14
PGND
PGND
PGND
ABSOLUTE MAXIMUM RATINGS
(1)
Thermal Resistance
(4)
Supply Voltage V
IN
....................................... 18V
Supply Voltage V
CC
........................................ 6V
V
SW
........................................-0.3V to V
IN
+ 0.3V
V
BST
...................................................... V
SW
+ 6V
I
VIN (RMS)
........................................................ 3.5A
V
PGOOD
...................................-0.3V to V
CC
+0.6V
All Other Pins ..................................-0.3V to +6V
(2)
Continuous Power Dissipation (T
A
= +25°C)
………………………………………………….2.6W
Junction Temperature ...............................150C
Lead Temperature ....................................260C
Storage Temperature............... -65C to +150C
QFN20 (3x4mm) ......................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 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
Recommended Operating Conditions
(3)
Supply Voltage V
IN
...........................4.5V to 16V
Supply Voltage V
CC
........................................ 5V
Output Voltage V
OUT
.........................0.8V to 13V
Operating Junction Temp. (T
J
). -40°C to +125°C
MP38900/MP38900-B Rev. 1.1
www.MonolithicPower.com
6/25/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
3
MP38900/MP38900-B – HIGH EFFICIENCY, FAST TRANSIENT SYNCHRONOUS STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
V
IN
= 12V, V
CC
=5V, T
A
= +25C, unless otherwise noted.
Parameters
Input Supply Current
(Shutdown)
Input Supply Current
(Quiescent)
Input Supply Current
(Quiescent)
V
CC
Supply Current
(Quiescent)
HS Switch On Resistance
(5)
LS Switch On Resistance
(5)
Switch Leakage
Current Limit
One-Shot On Time
Minimum Off Time
(5)
Fold-back Off Time
(5)
OCP hold-off time
(5)
Feedback Voltage
Feedback Current
Soft Start Charging Current
Soft Stop Discharging Current
Power Good Rising Threshold
Power Good Falling Threshold
Power Good Rising Delay
Power Good Rising Delay
EN Rising Threshold
EN Threshold Hysteresis
EN Input Current
V
CC
Under-Voltage Lockout
Threshold Rising
V
CC
Under-Voltage Lockout
Threshold Hysteresis
VIN Under-Voltage Lockout
Threshold Rising
VIN Under-Voltage Lockout
Threshold Hysteresis
V
CC
Regulator Output Voltage
V
CC
Regulator Load Regulation
V
OUT
Over-Voltage Protection
Threshold
Symbol
I
IN
I
IN
I
IN
Ivcc
HS
RDS-ON
LS
RDS-ON
SW
LKG
I
LIMIT
T
ON
T
OFF
T
FB
T
OC
V
FB
I
FB
+I
SS
-I
SS
PGOOD
Vth
-
Hi
PGOOD
Vth
-
Lo
T
PGOOD
T
PGOOD
EN
Vth-Hi
EN
Vth-Hys
I
EN
V
CC
UV
Vth
V
CC
UV
HYS
VINUV
Vth
VINUV
HYS
V
CC
V
OVP
R7=250kΩ,
V
OUT
=1.05V
I
LIM
=1 (HIGH)
I
LIM
=1 (HIGH)
807
V
FB
= 815mV
V
SS
=0V
V
SS
=0.815V
V
EN
= 0V, V
SW
= 0V or
12V
Condition
V
EN
= 0V
V
EN
= 2V, V
FB
= 0.95V,
MP38900-B
(6)
V
EN
= 2V, V
FB
= 0.95V
MP38900
(6)
V
EN
= 2V, V
FB
= 1V
MP38900
Min
Typ
0
420
40
350
27
10
0
16.5
300
100
7.5
50
815
10
8.5
8.5
0.9
0.85
1.5
1.5
1.35
420
1.5
4.0
880
3.8
4.0
880
5
5
1.25
4.2
1
Max
1
Units
μA
μA
μA
μA
mΩ
mΩ
μA
A
ns
ns
μs
μs
mV
nA
μA
μA
V
FB
V
FB
ms
ms
V
mV
μA
V
mV
V
mV
V
%
V
FB
823
50
Tss = 2ms, MP38900
MP38900-B
1.05
V
EN
= 2V
MP38900
MP38900
MP38900-B
MP38900-B
MP38900-B
MP38900-B, I
CC
=5mA
3.8
1.60
4.2
MP38900/MP38900-B Rev. 1.1
www.MonolithicPower.com
6/25/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
4
MP38900/MP38900-B – HIGH EFFICIENCY, FAST TRANSIENT SYNCHRONOUS STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
(continued)
V
IN
= 12V, V
CC
=5V, T
A
= +25C, unless otherwise noted.
Parameters
V
OUT
Under-Voltage Detection
Threshold
Thermal Shutdown
Thermal Shutdown Hysteresis
Symbol
V
UVP
T
SD
T
SD-HYS
Condition
Min
Typ
0.7
150
25
Max
Units
V
FB
°C
°C
Notes:
5) Guaranteed by design.
6) If the test condition is marked with MP38900 or MP38900-B, the characteristic applies to MP38900 or MP38900-B respectively.
MP38900/MP38900-B Rev. 1.1
www.MonolithicPower.com
6/25/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
5
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