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MPQ4459DQT-LF-Z

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
MPQ4459 – INDUSTRIAL GRADE, 1.5A, 4MHz, 36V STEP-DOWN CONVERTER
MPQ4459 Rev. 1.01 www.MonolithicPower.com 4
1/24/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
PIN FUNCTIONS
Pin # Name Description
1, 2 SW
Switch Node. This is the output from the high-side switch. A low V
f
Schottky rectifier to ground
is required. The rectifier must be close to the SW pins to reduce switching spikes.
3 EN
Enable Input. Pulling this pin below the specified threshold shuts the chip down. Pulling it up
above the specified threshold or leaving it floating enables the chip.
4 COMP
Compensation. This node is the output of the GM error amplifier. Control loop frequency
compensation is applied to this pin.
5 FB
Feedback. This is the input to the error amplifier. An external resistive divider connected
between the output and GND is compared to the internal +0.8V reference to set the regulation
voltage.
6 GND
Ground. It should be connected as close as possible to the output capacitor avoiding the high
current switch paths.
7 FREQ
Switching Frequency Program Input. Connect a resistor from this pin to ground to set the
switching frequency.
8, 9 VIN
Input Supply. This supplies power to all the internal control circuitry, both BS regulators and
the high-side switch. A decoupling capacitor to ground must e placed close to this pin to
minimize switching spikes.
10 BST
Bootstrap. This is the positive power supply for the internal floating high-side MOSFET driver.
Connect a bypass capacitor between this pin and SW pin.
MPQ4459 – INDUSTRIAL GRADE, 1.5A, 4MHz, 36V STEP-DOWN CONVERTER
MPQ4459 Rev. 1.01 www.MonolithicPower.com 5
1/24/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
TYPICAL PERFORMANCE CURVES
V
IN
= 12V, V
OUT
= 5V, f
S
= 500kHz, T
A
= +25C, unless otherwise noted.
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
V
OUT
AC Coupled
20mV/div.
I
L
1A/div.
V
SW
10V/div.
100
90
80
70
60
50
40
30
20
0 500 1000 1500
Efficiency vs
Load Current
100
90
80
70
60
50
40
30
20
0 500 1000 1500
Efficiency vs
Load Current
100
90
80
70
60
50
40
30
20
0 500 1000 1500
Efficiency vs
Load Current
V
OUT
AC Coupled
20mV/div.
I
L
1A/div.
V
SW
10V/div.
V
OUT
AC Coupled
20mV/div.
I
L
1A/div.
V
SW
10V/div.
Oscillating Frequency
vs R
FREQ
10 100 1000
MPQ4459 – INDUSTRIAL GRADE, 1.5A, 4MHz, 36V STEP-DOWN CONVERTER
MPQ4459 Rev. 1.01 www.MonolithicPower.com 6
1/24/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
TYPICAL PERFORMANCE CURVES (continued)
V
IN
= 12V, V
OUT
= 5V, f
S
= 500kHz, T
A
= +25C, unless otherwise noted.
V
EN
5V/div.
V
OUT
2V/div.
V
SW
10V/div.
I
L
1A/div.
V
EN
5V/div.
V
OUT
2V/div.
V
SW
10V/div.
I
L
1A/div.
Startup Through EN
I
OUT
= 0.1A
Shutdown Through EN
I
OUT
= 0.1A
Startup Through EN
I
OUT
= 1A
Shutdown Through EN
I
OUT
= 1A
Startup Through EN
I
OUT
= 1.5A
Shutdown Through EN
I
OUT
= 1.5A
Short Circuit Entry
I
OUT
= 0.1A
Shrot Circuit Recovery
I
OUT
= 0.1A
Transient Response
I
OUT
= 0.5A to 1.5A
V
EN
5V/div.
V
OUT
2V/div.
V
SW
10V/div.
I
L
1A/div.
V
OUT
2V/div.
I
L
1A/div.
V
OUT
2V/div.
I
L
1A/div.
V
EN
5V/div.
V
OUT
2V/div.
V
SW
10V/div.
I
L
2A/div.
V
OUT AC
100mV/div.
I
OUT
1A/div.
I
L
1A/div.
V
EN
5V/div.
V
OUT
2V/div.
V
SW
10V/div.
I
L
1A/div.
V
EN
5V/div.
V
OUT
2V/div.
V
SW
10V/div.
I
L
2A/div.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

MPQ4459DQT-LF-Z

Mfr. #:
Buy MPQ4459DQT-LF-Z
Manufacturer:
Monolithic Power Systems (MPS)
Description:
Switching Voltage Regulators 1.5A/36V 4MHz Step-Down Converter
Lifecycle:
New from this manufacturer.
Delivery:
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