MPQ2483A
Industrial/Automotive-Grade
55V, 2.5A Programmable
Frequency LED Driver
Available in AEC-Q100
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MPQ2483A is a 55V LED driver suitable for
either step-down or inverting step-up and stepdown applications. It achieves a 2.5A peak
current with excellent load and line regulation
over a wide input supply range.
The MPQ2483A incorporates both DC and
PWM dimming into a single control pin. The
separate input reference ground allows for
direct enable and dimming control for positiveto-negative power conversion.
Current-mode operation provides fast transient
response and eases loop stabilization. Full
protection features include cycle-by-cycle peak
current limiting, output over-voltage protection
(OVP), open-string protection, output short-circuit
protection (SCP), and thermal shutdown.
The MPQ2483A requires a minimal number of
readily available, standard, external components
and is available in 10-pin QFN (3mmx3mm) and
14-pin SOIC14 packages.
2.5A Maximum Peak Current
Buck or Buck-Boost Modes
Wide 4.5V to 55V Operating Input Range
0.28Ω Internal Power MOSFET Switch
Analog and PWM Dimming
0.198V Reference Voltage
5μA Shutdown Mode
Stable with Low ESR Capacitors
Cycle-by-Cycle Over-Current Protection
(OCP)
Thermal Shutdown, Over-Voltage (OVP),
Short–Circuit (SCP), and Open-String
Protection
AEC-Q100 Qualified
APPLICATIONS
General LED Illumination
LCD Backlight Panels
Automotive Lighting
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
MPQ2483A Rev. 1.01
www.MonolithicPower.com
8/15/2016
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© 2016 MPS. All Rights Reserved.
1
MPQ2483A –INDUSTRIAL GRADE, 2.5A, 55V, PROGRAMABLE FREQUENCY
ORDERING INFORMATION
Part Number
Package
Top Marking
MPQ2483ADQ*
MPQ2483ADQ-AEC1
MPQ2483ADS**
MPQ2483ADS-AEC1
QFN-10 (3mmx3mm)
QFN-10 (3mmx3mm)
SOIC-14
SOIC-14
See Below
See Below
See Below
See Below
* For Tape & Reel, add suffix –Z (e.g. MPQ2483ADQ–Z)
For RoHS compliant packaging, add suffix –LF (e.g. MPQ2483ADQ–LF–Z)
** For Tape & Reel, add suffix –Z (e.g. MPQ2483ADS–Z)
For RoHS compliant packaging, add suffix –LF (e.g. MPQ2483ADS–LF–Z)
TOP MARKING (MPQ2483ADQ)
ATK: Product code of MPQ2483ADQ
Y: Year code
LLL: Lot number
TOP MARKING (MPQ2483ADS)
MPS: MPS prefix
YY: Year code
WW: Week code
MP2483A: Part number
LLLLLLLLL: Lot number
MPQ2483A Rev. 1.01
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8/15/2016
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© 2016 MPS. All Rights Reserved.
2
MPQ2483A –INDUSTRIAL GRADE, 2.5A, 55V, PROGRAMABLE FREQUENCY
PACKAGE REFERENCE
TOP VIEW
VDD
VSS
OVP
FB
COMP
1
2
3
4
5
TOP VIEW
10
9
8
7
6
1
14
NC
2
13
SW
3
12
BST
OVP
4
11
INGND
FB
5
10
EN/DIM
COMP
6
9
REST
NC
7
8
NC
NC
SW
VDD
BST
INGND
EN/DIM
RSET
QFN-10 (3mmx3mm)
VSS
SOIC-14
ABSOLUTE MAXIMUM RATINGS (1)
Thermal Resistance
VDD - VSS (0°C TJ 125°C) ........................ 60V
VDD - VSS (-40°C TJ < 0°C) ......................... 58V
VSW - VSS .............................. -0.3V to VDD + 0.3V
VBST ...................................................... VSW + 6V
VOVP - VSS ........................................-0.3V to +6V
VEN - VINGND .....................................-0.3V to +6V
VDIM - VINGND ....................................-0.3V to +6V
VINGND - VSS ..................................... -0.3V to 60V
Other pins - VSS ................................ -0.3V to 6V
(2)
Continuous power dissipation (TA = +25°C)
QFN-10 (3mmx3mm)………………….…....2.5W
SOIC-14 ................................................... 1.54W
Junction temperature ................................150C
Lead temperature .....................................260C
Storage temperature ................ -65C to +150C
QFN-10 (3mmx3mm) .............. 50 ...... 12 ... C/W
SOIC-14 .................................. 86 ...... 38 ... C/W
Recommended Operating Conditions
(4)
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
recommended operating conditions.
4) Measured on JESD51-7, 4-layer PCB.
(3)
Supply voltage (VDD - VSS)
0C ≤ TJ ≤ 125°C……………...……...4.5V to 55V
-40C ≤ TJ < 0°C…………….………..4.5V to 50V
Operating junction temp. (TJ). .. -40°C to +125°C
MPQ2483A Rev. 1.01
www.MonolithicPower.com
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MPQ2483A –INDUSTRIAL GRADE, 2.5A, 55V, PROGRAMABLE FREQUENCY
ELECTRICAL CHARACTERISTICS
VIN = 12V, TJ = -40C to +125C, all voltages with respect to VSS. Typical values are based on the
average value when TJ = 25°C, unless otherwise noted.
Parameters
Symbol Condition
Feedback voltage
Feedback current
Switch-on resistance
Switch leakage
Current limit
(5)
VFB
IFB
RDS(ON)
ILIM
Oscillator frequency
fSW
Oscillator frequency(6)
fSW
Default oscillator frequency
fSW_default
Foldback frequency
Maximum duty cycle
Minimum on time(5)
Under-voltage lockout threshold rising
Under-voltage lockout threshold hysteresis
EN input current
EN off threshold (with respect to INGND)
EN on threshold (with respect to INGND)
Minimum EN dimming threshold
Maximum EN dimming threshold
Supply current (quiescent)
Shutdown current
Thermal shutdown(5)
Open LED OV threshold
Open LED OV hysteresis
4.5V VIN 12V
12V VIN 55V
VFB = 0.22V
Min
0.180
0.170
VEN = 0V, VSW = 0V
-40°C ≤ TJ ≤ 125°C,
duty cycle ≤ 61%
VFB = 0.19V,
RSET = 200kΩ
VFB = 0.19V,
RSET = 124kΩ
VFB = 0.19V,
RSET open
VFB = 0V, VOVP = 0V,
RSET open
VFB = 0.19V
2
2.7
VEN = 2V
VEN falling
VEN rising
VFB = 0V
VFB = 0.2V
VEN = 2V, VFB = 1V
VEN = 0V
th
hys
Units
V
µA
mΩ
μA
3.0
A
0.25
MHz
0.31
0.41
0.51
MHz
1.0
1.35
1.7
MHz
2.9
VOVP
VOVP
Max
0.215
0.220
1.0
280
tON
IQ
Ioff
Typ
0.198
0.198
250
kHz
90
100
3.3
200
1.4
%
ns
V
mV
μA
V
V
V
V
mA
μA
°C
V
mV
3.7
0.4
0.55
1.2
1.1
0.7
1.4
0.8
3.4
150
1.2
60
0.6
0.85
1.55
1.5
20
1.3
NOTE:
5) Derived from part characterization. Not tested in production.
6)
Only tested on QFN package.
MPQ2483A Rev. 1.01
www.MonolithicPower.com
8/15/2016
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MPQ2483A –INDUSTRIAL GRADE, 2.5A, 55V, PROGRAMABLE FREQUENCY
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 20V, ILED = 0.7A, two 3W LED in series, step-down application, unless otherwise noted.
LED Current vs. VEN
800
800
700
700
600
600
500
400
300
200
100
5
4.5
500
400
300
200
100
0.2
0.4
0.6
0.8
1
-100
0
400
DIMMING DUTY
3.5
3
800
1200
2
1600
0 10 20 30 40 50 60 70 80 90
DUTY CYCLE(%)
VEN(mV)
IQ vs. Temperature
Efficiency vs.
Input Voltage
100
95
4
2.5
0
0
0
2LED
3LED
VFB vs. Temperature
1000
250
900
230
800
210
90
VFB (mV)
EFFICIENCY ( % )
Ipeak vs. Duty
IPEAK (A)
LED CURRENT(mA)
LED CURRENT(mA)
LED Current
vs. Dimming Duty
85
1LED
700
80
170
600
75
70
0
10
20
30
40
50
VIN Voltage(V)
190
500
-40
-10
20
50
80
110
o
AMBIENT TEMPERATURE ( C)
140
150
-40
-10
20
50
80
110 140
AMBIENT TEMPERATURE (oC)
FSW vs. Temperature
SWITCH FREQUENCY (kHz)
650
610
570
530
490
450
-40
-10
20
50
80
110 140
AMBIENT TEMPERATURE (oC)
MPQ2483A Rev. 1.01
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8/15/2016
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MPQ2483A –INDUSTRIAL GRADE, 2.5A, 55V, PROGRAMABLE FREQUENCY
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 20V, ILED = 0.7A, two 3W LED in series, step-down application, unless otherwise noted.
PWM
5V/div.
VIN
10V/div.
SW
10V/div.
SW
10V/div.
IINDUCTOR
500mA/div.
IINDUCTOR
500mA/div.
IWLED
500mA/div.
EN
5V/div.
SW
10V/div.
IINDUCTOR
500mA/div.
IWLED
500mA/div.
EN
5V/div.
SW
10V/div.
IINDUCTOR
500mA/div.
IWLED
500mA/div.
OVP
500mV/div.
SW
10V/div.
SW
10V/div.
OVP
1V/div.
VOUT
5V/div.
IINDUCTOR
1A/div.
IINDUCTOR
2A/div.
ISHORT
2A/div.
MPQ2483A Rev. 1.01
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8/15/2016
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© 2016 MPS. All Rights Reserved.
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MPQ2483A –INDUSTRIAL GRADE, 2.5A, 55V, PROGRAMABLE FREQUENCY
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 20V, ILED = 0.7A, seven 3W LED in series, buck-boost application, referred to VSS, unless
otherwise noted.
800
800
100
700
700
95
600
600
90
500
500
400
100
100
0
IINDUCTOR
2A/div
IWLED
500mA/div
VIN
20V/div
75
200
200
VIN
2V/div
SW
20V/div
80
300
300
0
85
400
0
0.2
0.4
0.6
0.8
1
-100
70
65
60
0
EN
20V/div
IWLED
500mA/div
0
10
20
30
40
50
EN
20V/div
SW
20V/div
SW
20V/div
IL
2A/div
IWLED
500mA/div
IL
2A/div
IWLED
500mA/div
OVP
500mV/div
SW
20V/div
SW
20V/div
IINDUCTOR
2A/div
200 400 600 800 1000 1200 1400 1600
VLED+
10V/div
IINDUCTOR
1A/div
SW
10V/div
EN
5V/div
ISHORT
2A/div
MPQ2483A Rev. 1.01
www.MonolithicPower.com
8/15/2016
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© 2016 MPS. All Rights Reserved.
7
MPQ2483A –INDUSTRIAL GRADE, 2.5A, 55V, PROGRAMABLE FREQUENCY
PIN FUNCTIONS
QFN-10
Pin #
SOIC-14
Pin #
1
2
2
3
3
4
4
5
5
6
6
9
7
10
8
11
9
12
10
13
1, 7, 8,
14
Name
Description
Supply voltage. The MPQ2483A operates from a +4.5V to +55V unregulated
input with respect to VSS. C1 and C2 are needed to prevent large voltage
spikes from occurring at input.
Power return. Connect VSS to the lowest potential in the circuit, typically the
Schottky rectifier anode. VSS is the voltage reference for the regulated output
VSS
voltage. Place VSS outside of the D1 to C1 and C2 ground paths to prevent
switching current spikes from inducing voltage noise in the part. The exposed
pad is also connected to VSS.
Over-voltage protection. Use a voltage divider to program the OVP threshold.
When the OVP voltage reaches the shutdown threshold of 1.2V, the switch
turns off and recovers when the OVP voltage decreases sufficiently. When the
OVP OVP voltage (with respect to VSS) is lower than 0.4V, and the FB voltage is
lower than 0.1V, the chip recognizes this as a short-circuit condition, and the
operating frequency folds back. Program the OVP voltage from 0.4V to 1.2V for
normal operation.
LED current feedback input. The MPQ2483A regulates the voltage across the
current-sensing resistor between FB and VSS. Connect the current-sensing
FB
resistor from the bottom of the LED strings to VSS. FB is connected to the
bottom of the LED strings. The regulation voltage is 0.198V.
Error amplifier output. Connect a capacitor 1nF or larger to COMP to improve
COMP
stability, provide PWM dimming, and provide a soft-on at start-up.
Frequency set. Connect a resistor to VSS to set the switching frequency.
RSET Connect a 1nF capacitor to VSS to bypass the noise. When RSET is left open,
the default operating frequency is 1.35MHz.
On/Off control input and dimming command input. A voltage greater than
0.6V turns the chip on. Both DC and PWM dimming are implemented on
EN/DIM. When the EN/DIM voltage (with respect to INGND) rises from 0.7V to
EN/DIM
1.4V, the LED current changes from 0% to 100% of the maximum LED current.
To use PWM dimming, apply a 100Hz to 2kHz square wave signal with an
amplitude greater than 1.4V to EN/DIM.
INGND Input ground reference. INGND is the reference for the EN/DIM signal.
Bootstrap. A capacitor is connected between SW and BST to form a floating
supply across the power switch driver. A ceramic capacitor of 100nF or larger is
BST
recommended to provide sufficient energy to drive the power switch’s gate
above the supply voltage.
Switch output. SW is the source of the internal MOSFET switch. Connect SW
SW
to the power inductor and the cathode of the Schottky rectifier.
VDD
NC
No connection.
Exposed
Connect exposed pad to VSS in step-up/down mode.
Pad
MPQ2483A Rev. 1.01
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MPQ2483A –INDUSTRIAL GRADE, 2.5A, 55V, PROGRAMABLE FREQUENCY
FUNCTIONAL BLOCK DIAGRAM
M
COMP
Figure 1: Functional Block Diagram
MPQ2483A Rev. 1.01
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MPQ2483A –INDUSTRIAL GRADE, 2.5A, 55V, PROGRAMABLE FREQUENCY
OPERATION
The MPQ2483A is a current-mode regulator. The
error amplifier (EA) output voltage is proportional
to the peak inductor current.
At the beginning of a cycle, M1 is off. The EA
output voltage is higher than the current sense
amplifier output, and the current comparator’s
output is low. The rising edge of the 1.35MHz
CLK signal sets the RS flip-flop. Its output turns
M1 on and connects SW and the inductor to the
input supply.
The increasing inductor current is sensed and
amplified by the current sense amplifier. Ramp
compensation is summed to the current sense
amplifier output and is compared to the error
amplifier output by the PWM comparator. When
the sum of the current sense amplifier output and
the slope compensation signal exceeds the EA
output voltage, the RS flip-flop is reset, and M1 is
turned off. The external Schottky rectifier diode
(D1) conducts the inductor current.
If the sum of the current sense amplifier output
and the slope compensation signal does not
exceed the EA output for the entire cycle, then
the falling edge of the CLK resets the flip-flop.
The output of the error amplifier integrates the
voltage difference between the feedback and the
0.198V reference. The polarity is a FB voltage
lower than 0.198V, which increases the EA
output voltage. Since the EA output voltage is
proportional to the peak inductor current, an
increase in its voltage also increases the current
delivered to the output.
Open LED Protection
If the LED is open, there is no voltage on FB. The
duty cycle increases until OVP-VSS reaches the
shutdown threshold set by the external resistor
divider. The top switch turns off and remains off
until the voltage on OVP-VSS decreases
sufficiently.
Dimming Control
The MPQ2483A allows for both DC and PWM
dimming. When the voltage on EN is less than
0.6V, the chip turns off.
For analog dimming, the LED current changes
from 0% to 100% of the maximum LED current
when the voltage on EN is between 0.7V and
1.4V. If the voltage on EN is higher than 1.4V, a
maximum LED current is generated.
For PWM dimming, the VDIM-VINGND amplitude
must exceed 1.4V. The PWM frequency is
recommended to be in the range of 100Hz to
2kHz for optimal dimming linearity.
Output Short-Circuit Protection
The MPQ2483A has output short-circuit
protection. When the output is shorted to VSS,
the voltage on OVP (which detects the output
voltage) drops to under 0.4V. FB cannot sense
any voltage (0.3V positive
spike, which may cause false actions or damage.
(2)
Where ∆IL is the inductor ripple current.
MPQ2483A Rev. 1.01
11/28/2009
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MPQ2483A –INDUSTRIAL GRADE, 2.5A, 55V, PROGRAMABLE FREQUENCY
To clamp the VSS-INGND positive spike, it is
recommended to add a 100Ω resistor from
INGND to input GND to clamp the current from
VSS to INGND. Add a low forward voltage
Schottky diode (e.g. B160) from VSS to INGND
to clamp the negative oscillation voltage (see
Figure 3). The voltage rating of the Schottky
diode should be higher than the OVP voltage set
by R3 and R4.
For extremely high VSS-INGND spike conditions,
a bigger R2 and a higher current rating for D2 are
needed to clamp the current.
INGND
R2
100
VSS
D2
B160
Figure 4: FB Positive Spike-Protection Circuit
PCB Layout Guidelines
Efficient PCB layout is critical for stable
operation. For best results, follow the guidelines
below.
1. Place the high-current paths (VSS, VDD,
and SW) as close to the device as
possible with short, direct, and wide
traces.
2. Place the input capacitor as close to VDD
and VSS as possible.
3. Place the external feedback resistors next
to FB.
4. Keep the switch node traces short and
away from the feedback network.
Figure 3: VSS-INGND Positive Spike-Protection
Circuit
Selecting the FB Positive Spike-Protection
Circuit
In applications where there is a possibility that FB
can have an abnormally high positive spike, such
as load transients from high to low, or LED+ short
circuit from LED+ to LED- in buck, boost, and
buck-boost applications, an abnormally high
positive spike on FB can create false actions or
damage.
To protect FB from positive spikes that are too
high, it is recommended to add a 10kΩ resistor
between LED- and FB to clamp the current from
LED- to FB, and to add a
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