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MP2490DQ-LF-Z

P1-P3P4-P6P7-P9P10-P12P13-P13
MP2490 – 1.5A, 36V, 700kHz STEP-DOWN WITH PROGRAMMABLE OUTPUT CURRENT LIMIT
MP2490 Rev. 1.0 www.MonolithicPower.com 4
4/9/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
PIN FUNCTIONS
QFN10-3
Pin #
SOIC-8 /
PDIP-8
Pin#
Name Description
1 1 VIN
Supply Voltage. The MP2490 operates from a +4.5V to +36V unregulated
input. C
IN
is needed to prevent large voltage spikes from appearing at the
input. Put C
IN
as close to the IC as possible. It is the drain of the internal
power device and power supply for the whole chip.
2 2 GND
Ground. This pin is the voltage reference for the regulated output voltage.
For this reason care must be taken in its layout. This node should be placed
outside of the D1 to C
IN
ground path to prevent switching current spikes from
inducing voltage noise into the part.
3 EN On/Off Control Input. (Only available for the MP2490DQ)
4 3 FB
Feedback. An external resistor divider from the output to GND, tapped to the
FB pin sets the output voltage. To prevent current limit run away during a
short circuit fault condition the frequency-fold-back comparator lowers the
oscillator frequency when the FB voltage is below 250mV.
5 4 SS
Connect to an external capacitor used for Soft-Start and compensation for
current limiting loop.
6 5 ISN Negative Current Sense Input for load current limiting.
7 6 ISP Positive Current Sense
8 PGOOD
Power good signal. When FB is less than 90% of 0.8V, PGOOD is low. It is
an open-drain output. Use a high value pull-up resistor externally to pull it up
to system power supply.
9 7 BST
Bootstrap. This capacitor is needed to drive the power switch’s gate above
the supply voltage. It is connected between SW and BST pins to form a
floating supply across the power switch driver. An on-chip regulator is used
to charge up the external boot-strap capacitor. If the on-chip regulator is not
strong enough, one optional diode can be connected from IN or OUT to
charge the external boot-strap capacitor.
10 8 SW Switch Output. It is the source of power device.
MP2490 – 1.5A, 36V, 700kHz STEP-DOWN WITH PROGRAMMABLE OUTPUT CURRENT LIMIT
MP2490 Rev. 1.0 www.MonolithicPower.com 5
4/9/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
TYPICAL PERFORMANCE CHARACTERISTICS
C1=C2=4.7μF, C3=C4=10μF, C8=0.1μF, L=12μH, T
A
=25ºC, unless otherwise noted
PEAK CURRENT (A)
DUTY CYCLE (%)
Peak Current vs.
Duty Cycle
40
2.0
2.2
2.4
2.6
2.8
3.0
3.2
50 60 70 80 90
11.7
11.8
11.9
12.0
12.1
12.2
12.3
Load Regulation
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD CURRENT (mA)
Load Regulation Load Regulation
0 400
3.20
3.24
3.28
3.32
3.36
3.40
4.90
4.94
4.98
5.02
5.06
5.10
800 1200 1600 2000 0 400 800 1200 1600 2000 0 400 800 1200 1600 2000
EFFICIENCY (%)
50
60
70
80
90
100
LOAD CURRENT (mA)
Efficiency vs.
Load Current
10 100 1000 10000
EFFICIENCY (%)
50
60
70
80
90
100
LOAD CURRENT (mA)
Efficiency vs.
Load Current
10 100 1000 10000
V
OUT
=5V
V
IN
=8V
V
IN
=12V
V
IN
=24V
EFFICIENCY (%)
50
60
70
80
90
100
LOAD CURRENT (mA)
Efficiency vs.
Load Current
10 100 1000 10000
V
IN
=8V
V
IN
=12V
V
IN
=24V
V
OUT
=3.3V
V
IN
=18V
V
IN
=24V
V
IN
=36V
V
OUT
=12V
V
IN
=5V
V
IN
=12V
V
IN
=24V
V
IN
=8V
V
IN
=12V
V
IN
=24V
V
IN
=24V
V
IN
=36V
V
IN
=15V
V
OUT
=3.3V
GAIN (dB)
0 0.5 1.0 1.5 2.0 2.5
OUTPUT VOLTAGE (V)
0.5
1.5
2.5
3.5
4.5
5.5
Current Regulation
V
IN
=12V, V
OUT
=5V
R: Sense to RS, L: Sense to DCR
R L
Loop Gain Bode Plot
V
IN
=12V, V
OUT
=5V, I
OUT
=0.5A
LOAD CURRENT (A)
PHASE DEGREE
1 10 100 1000
FREQUENCY (kHz)
-60
-40
-20
0
20
40
60
-135
-90
-45
0
45
90
135
Phase
Gain
MP2490 – 1.5A, 36V, 700kHz STEP-DOWN WITH PROGRAMMABLE OUTPUT CURRENT LIMIT
MP2490 Rev. 1.0 www.MonolithicPower.com 6
4/9/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
C1=C2=4.7μF, C3=C4=10μF, C8=0.1μF, L=12μH, T
A
=25ºC, unless otherwise noted
Power Ramp Up
V
IN
=12V, V
EN
put to V
IN
V
OUT
=5V, I
OUT
=130mA, Resistor Load
Enable Up
V
IN
=15V, V
EN
put to V
IN
V
OUT
=12V, I
OUT
=1A, Resistor Load
Steady State
V
IN
=15V, V
EN
put to V
IN
V
OUT
=12V, I
OUT
=1.8A, Electrical Load
Short Circuit
V
IN
=12V, V
EN
put to V
IN
V
OUT
=5V
Short Circuit Recovery
V
IN
=12V, V
EN
put to V
IN
V
OUT
=5V
Enable Down
V
IN
=15V, V
EN
put to V
IN
V
OUT
=12V, I
OUT
=1A, Resistor Load
Power Ramp Down
V
IN
=12V, V
EN
put to V
IN
V
OUT
=5V, I
OUT
=130mA, Resistor Load
V
OUT
20mV/div
I
L
1A/div
V
SW
5V/div
V
PG
5V/div
V
OUT
20mV/div
I
L
1A/div
V
SW
20V/div
V
PG
5V/div
V
OUT
20mV/div
I
L
1A/div
V
OUT
2V/div
I
L
2A/div
V
OUT
2V/div
I
L
2A/div
V
SW
10V/div
V
PG
5V/div
V
OUT
5V/div
I
L
0.2A/div
V
SW
10V/div
V
IN
10V/div
V
OUT
5V/div
I
L
0.2A/div
V
SW
10V/div
V
IN
10V/div
V
EN
2V/div
V
OUT
10V/div
V
SW
10V/div
I
OUT
1A/div
V
EN
2V/div
V
OUT
10V/div
V
SW
10V/div
I
OUT
1A/div
1ms/div
2ms/div
2ms/div 10ms/div
Steady State
V
IN
=8V, V
EN
put to V
IN
V
OUT
=5V, I
OUT
=1.8A, Electrical Load
Steady State
V
IN
=16V, V
EN
put to V
IN
V
OUT
=5V, I
OUT
=1.8A, Electrical Load
P1-P3P4-P6P7-P9P10-P12P13-P13

MP2490DQ-LF-Z

Mfr. #:
Buy MP2490DQ-LF-Z
Manufacturer:
Monolithic Power Systems (MPS)
Description:
Switching Voltage Regulators 1.5A 36V 700kHz Buck w/Prog Ilimit
Lifecycle:
New from this manufacturer.
Delivery:
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