MP9186
20V, 6A Synchronous
Step-Down Converter
The Future of Analog IC Technology
DESCRIPTION
The MP9186 is a synchronous, rectified, step-
down, switch-mode converter with internal
power MOSFETs. It offers a very compact
solution to achieve a 6A continuous output
current over a wide input supply range with
excellent load and line regulation. The MP9186
has synchronous mode operation for higher
efficiency over the output current load range.
Current-mode operation provides a fast
transient response and eases loop stabilization.
Full protection features include over-current
protection and thermal shutdown.
The MP9186 requires a minimal number of
readily-available standard external components
and is available in a space saving 3mm×3mm
14-pin QFN package.
FEATURES
•
•
•
•
•
•
•
•
•
•
•
•
•
Wide 4.5V-to-20V Operating Input Range
6A Output Current
Low R
DS(ON)
Internal Power MOSFETs
Programmable Switching Frequency
Programmable EN Delay
Frequency SYNC from 300kHz to 2MHz
External Clock
Low Power Mode Selectable by an External
Signal
External Soft Start
OCP and Thermal Shutdown
Available in a 14-pin 3x3mm QFN Package
APPLICATIONS
DSL Modems
Cable Modems
Set-top Boxes
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
VIN
U1
IN
VCC
ON
OFF
BS T
SW
1V/6 VOU T
A
VCC
EN
C DEL AY
47nF
LPM
EN
MP9186
R
T
75k
R1
2.61k
LPM
FB
R2
10k
C SS
22nF
FREQ/SYNC
R FREQ
30.1k
FREQ/SYNC
GND
SS
MP9186 Rev. 1.0
2/4/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
1
MP9186 – 20V, 6A SYNCHRONOUS STEP-DOWN CONVERTER
ORDERING INFORMATION
Part Number
MP9186GQ*
Package
QFN14 (3×3mm)
Top Marking
AEK
* For Tape & Reel, add suffix –Z (eg. MP9186GQ–Z);
PACKAGE REFERENCE
PIN 1 ID
GND GND
GND
SW
2
1
14 13
12
11
AGND
SW
BS T
VCC
FREQ
/SYNC
IN
3
EN
LPM
4
5
6
IN
10
9
8
7
FB SS
ABSOLUTE MAXIMUM RATINGS
(1)
V
IN
................................................ -0.3V to 22V
V
SW
....................................................................
-0.3V (-5V for <10ns) to 23V (25V for <10ns)
V
BST
.....................................................V
SW
+ 6V
(2)
All Other Pins ................................ -0.3V to 6V
Lead Temperature ................................... 260°C
(3)
Continuous Power Dissipation (T
A
= +25°C)
3x3 QFN14 ................................................2.1W
Junction Temperature .............................. 150°C
Thermal Resistance
(5)
θ
JA
θ
JC
QFN14 (3x3mm) .................... 60 ...... 12 ... °C/W
Notes:
1) Exceeding these ratings may damage the device.
2) Please refer to page 9, Enable Control section, For absolute
maximum rating of EN pin.
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 20V
Output Voltage V
OUT
................. 0.8V to V
IN
x90%
Operating Junction Temp. (T
J
) -40°C to +125°C
MP9186 Rev. 1.0
2/4/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
2
MP9186 – 20V, 6A SYNCHRONOUS STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
V
IN
= 12V, T
A
= 25°C, unless otherwise noted.
Parameters
Supply Current (Shutdown)
Supply Current (Quiescent)
HS Switch-On Resistance
LS Switch-On Resistance
Switch Leakage
Current Limit
(6)
Symbol
I
IN
I
Q
HS
RDS-ON
LS
RDS-ON
SW
LKG
I
LIMIT
f
SW
D
MAX
T
ON_MIN
f
SYNC
V
FB
I
FB
VIL
EN
VIH
EN
I
EN
INUV
Vth
INUV
HYS
V
CC
Condition
V
EN
= 0V
V
EN
= 2V, V
FB
= 1V
Min
Typ
10
0.8
60
30
0
Max
15
1.2
Units
µA
mA
m
m
µA
A
V
EN
= 0V, V
SW
= 0V or
12V
Duty=40%
R
SET
=30k
V
FB
= 700mV, R
SET
=30k
1
7.4
400
90
0.3
782
9.4
500
95
40
798
25
1.12
1.50
2.3
4
820
5
1
150
30
600
Oscillator Frequency
Maximum Duty Cycle
(6)
Minimum On Time
Sync Frequency Range
Feedback Voltage
Feedback Current
EN Input Low Voltage
EN Input High Voltage
EN Pin Pull-Up Current
V
IN
Under-Voltage Lockout
Threshold Rising
V
IN
Under-Voltage Lockout
Threshold Hysteresis
VCC Regulator
VCC Load Regulation
(6)
Thermal Shutdown
(6)
Thermal Shutdown Hysteresis
Soft Start Current
Note:
6) Guaranteed by design
V
FB
= 800mV
0.98
1.32
1.2
3.75
2
814
50
1.32
1.78
3.5
4.25
kHz
%
ns
MHz
mV
nA
V
V
µA
V
mV
V
%
°C
°C
I
CC
=5mA
T
SD
T
SD-HYS
I
SS
5
8
11
µA
MP9186 Rev. 1.0
2/4/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
3
MP9186 – 20V, 6A SYNCHRONOUS STEP-DOWN CONVERTER
PIN FUNCTIONS
QFN 3×3mm
Pin #
1, 13, 14
2, 11
3, 15 (IN)
4
5
6
7
8
9
10
12
Name
GND
SW
IN
EN
LPM
FB
SS
Description
Ground. Connect these pins with larger copper areas to the negative terminals of the
input and output capacitors.
Switch Output. Use wide PCB traces to make the connection.
Supply Voltage. The MP9186 operates from a 4.5V-to-20V input rail. Requires C1 to
decouple the input rail. Use wide PCB traces and multiple vias to make the connection.
Enable. EN=1 to enable the MP9186. The EN pin sources 2.3µA current. Place a
capacitor from EN to GND for delayed start-up.
Low-Power Mode Input. An active-high signal enables low-power mode operation.
Connect LPM pin to GND to disable it and make the converter always operate in CCM.
Feedback. Connect to the tap of an external resistor divider from the output to GND to
set the output voltage.
Soft Start. Connect an external capacitor to program the soft-start time for the switch-
mode regulator.
FREQ/ Switching Frequency Program Input. Connect a resistor from this pin to GND to set the
SYNC switching frequency. This pin also serves as a frequency-synchronous clock input.
VCC
BST
AGND
Bias Supply. Decouple with 1µF capacitor. Decouple capacitor must be close enough
to VCC pin to increase noise immunity.
Bootstrap. Requires a capacitor connected between SW and BST pins to form a
floating supply across the high-side switch driver.
Analog ground for internal control circuit.
MP9186 Rev. 1.0
2/4/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
4
MP9186 – 20V, 6A SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL CHARACTERISTICS
V
IN
= 12V, V
OUT
= 1V, L = 1.5 H, f
S
=500kHz, T
A
= +25°C, unless otherwise noted.
868
867
866
10.
4
10.
2
10.
0
9.
8
810
808
806
804
802
800
798
796
794
792
790
-50-30-10 10 30 50 70 90 110130
865
9.
6
864
863
4
9.
4
9.
2
4
6
8 10 12 14 16 18 20 22
6
8 10 12 14 16 18 20 22
0.
4
0.
3
0.
2
0.
1
0.
0
- 1
0.
- 2
0.
- 3
0.
- 4
0.
0 0. 1 1. 2 2. 3 3. 4 4. 5 5. 6
5
5
5
5
5
5
0.
4
0.
3
0.
2
0.
1
0.
0
- 1
0.
- 2
0.
- 3
0.
- 4
0.
5
8
11
14
17
20
11.
0
10.
5
10.
0
9.
5
9.
0
8.
5
8.
0
7.
5
7.
0
6.
5
6.
0
10
20
30
40
50
60
70
80
MP9186 Rev. 1.0
2/4/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
5
模拟电子
