MP9486A
100V Input, 3.5A, Switching Current Limit
Step-Down Converter
DESCRIPTION
FEATURES
The MP9486A is a high-voltage, step-down,
switching regulator that delivers up to 1A of
continuous current to the load. It integrates a
high-side, high-voltage, power MOSFET with a
current limit of 3.5A, typically. The wide 4.5V to
100V input range accommodates a variety of
step-down applications, making it ideal for
automotive, industry, and lighting applications.
Hysteretic voltage-mode control is employed for
very fast response. MPS’s proprietary feedback
control scheme minimizes the number of
required external components.
The switching frequency can be up to 1MHz,
allowing for small component size. Thermal
shutdown and short-circuit protection (SCP)
provide reliable and fault-tolerant operations. A
170µA quiescent current allows the MP9486A
to be used in battery-powered applications.
Wide 4.5V to 100V Input Range
3.5A Typical Peak Switching Current Limit
Hysteretic Control: No Compensation
Up to 1MHz Switching Frequency
PWM Dimming Control Input for LED
Application
Short-Circuit Protection (SCP) with
Integrated High-Side MOSFET
170μA Quiescent Current
Thermal Shutdown
Available in a SOIC-8 Package with an
Exposed Pad
APPLICATIONS
The MP9486A is available in a SOIC-8 package
with an exposed pad.
Scooters, E-Bike Control Power Supplies
Solar Energy Systems
Automotive System Power
Industrial Power Supplies
High-Power LED Drivers
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 vs. Output Current
C3
VIN
C1
EN
EN
DIM
L1
D1
MP9486A
GND
VOUT
SW
R1
FB
R2
C2
Efficiency(%)
VIN
BST
100
90
80
70
60
50
40
30
20
10
0
V OUT=5V, L=33uH
Vin=36V
Vin=60V
1
10
100
Output Current(mA)
MP9486A Rev. 1.1
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1000
1
MP9486A – 100V INPUT, 3.5A, SWITCHING CURRENT LIMIT STEP-DOWN CONVERTER
ORDERING INFORMATION
Part Number*
Package
Top Marking
MP9486AGN
SOIC-8 EP
See Below
* For Tape & Reel, add suffix –Z (e.g. MP9486AGN–Z)
TOP MARKING
MP9486A: Part number
LLLLLLLL: Lot number
MPS: MPS prefix
Y: Year code
WW: Week code
PACKAGE REFERENCE
TOP VIEW
FB
1
8
GND
NC
2
7
EN
VIN
3
6
DIM
BST
4
5
SW
SOIC-8 EP
MP9486A Rev. 1.1
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MP9486A – 100V INPUT, 3.5A, SWITCHING CURRENT LIMIT STEP-DOWN CONVERTER
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance
Supply voltage (VIN) ...................-0.3V to +100V
Switch voltage (VSW) .................................. -0.5V
… ................. -0.5V(-7V for 10ns) to VIN + 0.5V
to VIN + 0.5V
BST to SW ......................................-0.3V to +6V
All other pins ...................................-0.3V to +6V
Junction temperature ................................150°C
(2)
Continuous power dissipation (TA = +25°C)
(4)
............................................................... 3.6W
Lead temperature .....................................260°C
Storage temperature ................ -65°C to +150°C
SOIC-8 EP
(4)
EV9486-N-00A .................. 34 ........ 4 .... °C/W
(5)
JESD51-7 .......................... 50 ....... 10... °C/W
Recommended Operating Conditions
(3)
Supply voltage (VIN) ........................ 4.5V to 95V
EN and DIM voltages ............................ 0V to 5V
Maximum switching frequency .................. 1MHz
Operating junction temp. (TJ) ... -40°C to +125°C
θJA
θJC
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
produces an excessive die temperature, causing the regulator
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 EV9486-N-00A 2-layer 63mmx63mm board.
5) Measured on JESD51-7 4-layer board.
MP9486A Rev. 1.1
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MP9486A – 100V INPUT, 3.5A, SWITCHING CURRENT LIMIT STEP-DOWN CONVERTER
ELECTRICAL CHARACTERISTICS
VIN = 60V, TA = +25°C, unless otherwise noted. Specifications over temperature are guaranteed
by design and characterization.
Parameter
Symbol
VIN UVLO threshold
VIN UVLO hysteresis
Shutdown supply current
Quiescent supply current
Upper switch on resistance (6)
Upper switch leakage current
Current limit
EN up threshold
EN threshold hysteresis
EN input current
EN pull-up current
DIM up threshold
DIM threshold hysteresis
DIM input current
RDS(ON)
ISWLK
IPK
VENH
VENHY
IENI
IENS
VDIMH
VDIMHY
IDIM
DIM on propagation delay
TDIMDH
DIM off propagation delay
TDIMDL
Feedback voltage threshold high (6)
VFBH
Feedback voltage threshold low (6)
VFBL
FB input current
IFB
FB propagation delay to output
high(6)
TFBDH
FB propagation delay to output
high(6)
TFBDL
Thermal shutdown (7)
Condition
VEN = 0V
No load, DIM = low,
VFB = 250mV
VBST - VSW = 5V
VEN = 0V, VSW = 0V
VFB = 0.15V
Min
Typ
Max
Units
3.6
4.0
0.4
2
4.35
5
V
V
µA
170
240
µA
2.9
1.4
VEN = 5V
VEN = 2V
0.8
VDIM = 5V or 0V
VFB = 0V, VDIM rising edge to
VSW rising edge
VFB = 0V, VDIM falling edge to
VSW falling edge
4.5V < VIN < 95V, VFB rising
from 0V until VSW < 30V
4.5V < VIN < 95V, VFB falling
from 0.25V until VSW > 30V
VFB = 5V or 0V
Falling edge of VFB from
0.25V to 0V to VSW rising
edge
Rising edge of VFB from 0V
to 0.25V to VSW falling edge
Trigger thermal shutdown
Hysteresis
500
0.01
3.5
1.55
320
0.01
2
1.15
300
-1
1
4.5
1.7
1
3
1.5
1
mΩ
µA
A
V
mV
µA
µA
V
mV
µA
50
ns
50
ns
209
215
221
mV
179
185
191
mV
300
nA
-300
100
ns
100
ns
150
20
C
NOTES:
6) Guaranteed by design.
7) Guaranteed by characterization, not tested in production.
MP9486A Rev. 1.1
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MP9486A – 100V INPUT, 3.5A, SWITCHING CURRENT LIMIT STEP-DOWN CONVERTER
TYPICAL CHARACTERISTICS
VIN = 60V, TA = +25°C, unless otherwise noted.
Quiesvent Current vs. Input Voltage
Shutdown Current vs. Input Voltage
220
5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
Input Current(uA)
Input Current(uA)
EN=LOW
EN=HIGH, DIM=LOW, V FB=250mV
210
200
190
180
4
17
30
43
56
69
82
95
4
17
30
Input Voltage(V)
56
69
82
95
Input Voltage(V)
Quiescent Current vs. Temperature
Shutdown Current vs. Temperature
V IN =95V, DIM=LOW,EN=HIGH,VFB=250mV
V IN =95V, EN=LOW
20
220
16
210
Input Current(uA)
Input Current(uA)
43
12
8
4
200
190
180
0
-40 -20 0
-40 -20 0
20 40 60 80 100 120 140
20 40 60 80 100 120 140
J unction Temperature(oC)
J unction Temperature(oC)
EN Threshold vs. Temperature
UVLO Threshold vs. Temperature
2
4.5
rising
falling
4.1
3.9
1.7
EN Threshold(V)
Vin Threshold(V)
4.3
1.4
1.1
rising
0.8
3.7
falling
0.5
3.5
-40 -20
0
20
40
60
80 100 120 140
J unction Temperature(oC)
-40 -20
0
20
40
60
80 100 120 140
J unction Temperature(oC)
MP9486A Rev. 1.1
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MP9486A – 100V INPUT, 3.5A, SWITCHING CURRENT LIMIT STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 60V, VOUT = 5V, IOUT = 1A, L = 33μH, COUT = 100μF, TA = +25°C, unless otherwise noted.
100
90
80
70
60
50
40
30
20
10
0
Load Regulation
Regulation Error(%)
Efficiency(%)
Efficiency vs. Output Current
Vin=36V
Vin=60V
1
10
100
Output Current(mA)
1000
1
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
Vin=36V
Vin=60V
0
200
400
600
800
1000
Output Current(mA)
Line Regulation
2
Iout=1mA
Regulation Error(%)
1.5
Iout=1000mA
1
0.5
0
-0.5
-1
-1.5
-2
0
10 20 30 40 50 60 70 80 90 100
Input Voltage(V)
MP9486A Rev. 1.1
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MP9486A – 100V INPUT, 3.5A, SWITCHING CURRENT LIMIT STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 60V, VOUT = 5V, IOUT = 1A, L = 33μH, COUT = 100μF, TA = +25°C, unless otherwise noted.
Steady State
Steady State
IOUT = 0A
IOUT = 1A
CH1:
CH1:
VOUT/AC
VOUT/AC
100mV/div.
100mV/div.
CH2: VIN
50V/div.
CH2: VIN
50V/div.
CH3: VSW
50V/div.
CH3: VSW
50V/div.
CH4: IL
1A/div.
CH4: IL
2A/div.
4µs/div.
4µs/div.
Power On
Power On
IOUT = 0A
IOUT = 1A
CH1: VOUT
CH1: VOUT
2V/div.
2V/div.
CH2: VIN
50V/div.
CH2: VIN
50V/div.
CH3: VSW
50V/div.
CH3: VSW
50V/div.
CH4: IL
1A/div.
CH4: IL
1A/div.
20ms/div.
20ms/div.
Power Off
Power Off
IOUT = 0A
IOUT = 1A
CH1: VOUT
CH1: VOUT
2V/div.
2V/div.
CH2: VIN
50V/div.
CH2: VIN
50V/div.
CH3: VSW
10V/div.
CH3: VSW
50V/div.
CH4: IL
500mA/div.
CH4: IL
1A/div.
100ms/div.
20ms/div.
MP9486A Rev. 1.1
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MP9486A – 100V INPUT, 3.5A, SWITCHING CURRENT LIMIT STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 60V, VOUT = 5V, IOUT = 1A, L = 33μH, COUT = 100μF, TA = +25°C, unless otherwise noted.
EN Start-Up
EN Start-Up
IOUT = 0A
IOUT = 1A
CH1: VOUT
CH1: VOUT
2V/div.
2V/div.
CH2: VEN
5V/div.
CH2: VEN
5V/div.
CH3: VSW
50V/div.
CH3: VSW
50V/div.
CH4: IL
1A/div.
CH4: IL
1A/div.
20ms/div.
20ms/div.
EN Shutdown
EN Shutdown
IOUT = 0A
IOUT = 1A
CH1: VOUT
2V/div.
CH1: VOUT
2V/div.
CH2: VEN
5V/div.
CH2: VEN
CH3: VSW
CH3: VSW
50V/div.
5V/div.
20V/div.
CH4: IL
1A/div.
CH4: IL
500mA/div.
100ms/div.
400µs/div.
SCP Entry
SCP Recovery
IOUT = 0A
IOUT = 0A
CH1: VOUT
CH1: VOUT
2V/div.
2V/div.
CH2: VIN
50V/div.
CH2: VIN
50V/div.
CH3: VSW
50V/div.
CH3: VSW
50V/div.
CH4: IL
1A/div.
CH4: IL
1A/div.
400µs/div.
40ms/div.
MP9486A Rev. 1.1
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MP9486A – 100V INPUT, 3.5A, SWITCHING CURRENT LIMIT STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 60V, VOUT = 5V, IOUT = 1A, L = 33μH, COUT = 100μF, TA = +25°C, unless otherwise noted.
SCP Entry
SCP Recovery
IOUT = 1A
IOUT = 1A, E-load turn-on threshold = 0.32V
CH1: VOUT
CH1: VOUT
2V/div.
2V/div.
CH2: VIN
50V/div.
CH2: VIN
50V/div.
CH3: VSW
50V/div.
CH3: VSW
50V/div.
CH4: IL
2A/div.
CH4: IL
1A/div.
1ms/div.
20ms/div.
Load Transient
IOUT=1A-->2A@70mA/µs
CH1:
VOUT/AC
50mV/div.
CH4: ILOAD
1A/div.
400µs/div.
MP9486A Rev. 1.1
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MP9486A – 100V INPUT, 3.5A, SWITCHING CURRENT LIMIT STEP-DOWN CONVERTER
PIN FUNCTIONS
SOIC-8 EP
Pin #
Name
1
FB
2
NC
3
VIN
4
BST
5
SW
6
DIM
7
EN
8
GND
Description
Feedback. FB is the input to the voltage hysteretic comparators. The average FB
voltage is maintained at 200mV by loop regulation.
No connection.
Input supply. VIN supplies power to all of the internal control circuitries, both BST
regulators, and the high-side switch. A decoupling capacitor to ground must be placed
close to VIN to minimize switching spikes.
Bootstrap. BST is the positive power supply for the internal, floating, high-side
MOSFET driver. Connect a bypass capacitor between BST and SW.
Switch node. SW is the output from the high-side switch. A low forward voltage
Schottky rectifier to ground is required. The rectifier must be placed close to SW to
reduce switching spikes.
PWM dimming input. DIM is useful in LED driver applications. Pull DIM below the
specified threshold for dimming off. Pull DIM above the specified threshold for dimming
on. If the dimming function is not needed, such as in common buck applications, then
connect DIM and EN together.
Enable input. Pull EN below the specified threshold to shut down the MP9486A. Pull
EN above the specified threshold or leave EN floating to enable the MP9486A.
Ground. GND should be placed as close to the output capacitor as possible to avoid the
high-current switch paths. Connect the exposed pad to GND plane for optimal thermal
performance.
MP9486A Rev. 1.1
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MP9486A – 100V INPUT, 3.5A, SWITCHING CURRENT LIMIT STEP-DOWN CONVERTER
BLOCK DIAGRAM
Figure 1: Function Block Diagram
MP9486A Rev. 1.1
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MP9486A – 100V INPUT, 1A, STEP-DOWN CONVERTER
OPERATION
Hysteresis Current Control with Adaptive
Threshold Adjustment
The MP9486A operates in a hysteretic voltagecontrol mode to regulate the output voltage. FB
is connected to the tap of a resistor divider,
which determines the output voltage. The
power MOSFET is turned on when the FB
voltage (VFB) drops to 185mV and remains on
until VFB rises to 215mV. The power MOSFET is
turned off when VFB rises to 215mV and
remains off until VFB falls to 185mV. The two
thresholds of 215mV and 185mV are adjusted
adaptively to compensate for all the circuit
delays, so the output voltage is regulated with
an average 200mV value at FB.
Enable (EN) Control
The MP9486A has a dedicated enable control
pin (EN) with positive logic. Its falling threshold
is 1.23V, and its rising threshold is 1.55V
(320mV higher).
When floating, EN is pulled up to about 3V by
an internal 2µA current source, so it is enabled.
A current over 2µA is needed to pull EN down.
Floating Driver and Bootstrap Charging
The floating power MOSFET driver is powered
by an external bootstrap capacitor. This floating
driver has its own under-voltage lockout (UVLO)
protection. The UVLO rising threshold is 2.2V
with a threshold of 150mV.
The bootstrap capacitor is charged and
regulated to about 5V by the dedicated internal
bootstrap regulator.
If the internal circuit does not have sufficient
voltage, and the bootstrap capacitor is not
sufficiently charged, extra external circuitry can
be used to ensure that the bootstrap voltage is
in the normal operating region. Refer to the
External Bootstrap Diode section on page 14
for more details.
Under-Voltage Lockout (UVLO)
Under-voltage lockout (UVLO) is implemented
to protect the chip from operating at an
insufficient supply voltage. The UVLO rising
threshold is about 4V, while its falling threshold
is a consistent 3.6V.
Dimming Function for LED Applications
Because the FB reference of the MP9486A is
very low, it is recommended to use the
MP9486A for LED drivers by connecting the
LED current sense resistor between FB and
GND. In such applications, the MP9486A uses
DIM for dimming. To achieve dimming, apply a
pulse on DIM. The high level of the pulse
should be >1.5V, and the low level should be
65%) and
very high frequency (close to 1MHz)
applications.
The bootstrap diode can be a low-cost one,
such as IN4148 or BAT54.
5V
1. Place the input decoupling capacitor, catch
diode, and the MP9486A (VIN, SW, and
PGND) as close to each other as possible.
2. Keep the power traces very short and fairly
wide, especially for the SW node.
This can help greatly reduce voltage spikes
on the SW node and lower the EMI noise
level.
3. Run the feedback trace as far from the
inductor and noisy power traces (like the
SW node) as possible.
4. Place thermal vias with 15mil barrel
diameter and 40mil pitch (distance between
the centers) under the exposed pad to
improve thermal conduction.
BST
MP9486A
PCB Layout Guidelines
Efficient PCB layout is critical for stable
operation. For best results, refer to Figure 3 and
follow the guidelines below.
0.1µF
SW
Via
Top Layer
Bottom Layer
VIN
C1A
C1B
C4
R1
R2
Figure 2: External Bootstrap Diode
U1
C3
C2B
D1
C2A
GND
L1
VOUT
Figure 3: Recommended Layout
MP9486A Rev. 1.1
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MP9486A – 100V INPUT, 3.5A, SWITCHING CURRENT LIMIT STEP-DOWN CONVERTER
Design Example
Table 1 is a design example following the
application guidelines for the specifications
below.
Table 1: Design Example
8V to 95V
Vin
5V
Vout
0A to 1A
Continuous Iout
2A
Pulse Iout
The typical application circuit for VOUT = 5V in
Figure 4 shows the detailed application
schematic and is the basis for the typical
performance waveforms. For more detailed
device applications, please refer to the related
evaluation board datasheets.
MP9486A Rev. 1.1
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MP9486A – 100V INPUT, 3.5A, SWITCHING CURRENT LIMIT STEP-DOWN CONVERTER
TYPICAL APPLICATION CIRCUIT
VIN
C3 0.1µF
2.2µF/ 2.2µF/
100V 100V
C1A
C1B
EN
BST
VIN
EN
GND
C4 C2A
0.1µF 4.7µF
SW
R1
D1
1A/100V 240kΩ
MP9486A
DIM
L1 33µH
VOUT
+
C2B
100µF/10V
TR3C107K010C0200
FB
R2
10kΩ
Figure 4: VIN = 8 ~ 95V, VOUT = 5V, IOUT = 1A
C3 0.1uF
2.2uF/ 2.2uF/
100V 100V
VIN
EN
C1A
C1B
VIN
EN
DIM
BST
C4 C2A
0.1uF 10uF
VOUT
SW
R1
D1
1A/100V 590k
MP9486A
GND
L1 47uH
+
R3
C2B
100uF/25V
FB
R2
10k
4.7k
C2B: T491X107K025AT
Figure 5: VIN=15~95V, VOUT=12V, IOUT=1A
MP9486A Rev. 1.1
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MP9486A – 100V INPUT, 3.5A, SWITCHING CURRENT LIMIT STEP-DOWN CONVERTER
PACKAGE INFORMATION
SOIC-8 EP
NOTICE: The information in this document is subject to change without notice. Users should warrant and guarantee that third
party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not
assume any legal responsibility for any said applications.
MP9486A Rev. 1.1
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