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MP1593DN-LF-Z

P1-P3P4-P6P7-P9P10-P12P13-P13
MP1593 – 3A, 28V, 385kHz STEP-DOWN CONVERTER
MP1593 Rev. 2.11 www.MonolithicPower.com 4
1/10/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
TYPICAL PERFORMANCE CHARACTERISTICS
Refer to Typical Application Schematic on Page 1
420
410
400
390
380
370
360
350
340
OSCILLATION FREQUENCY (KHz)
TEMPERATURE (°C)
Oscillation Frequency vs
Temperature
5.0
4.9
4.8
4.7
4.6
4.5
4.4
4.3
4.2
4.1
4.0
PEAK CURRENT LIMIT (A)
TEMPERATURE (°C)
Peak Current Limit vs
Temperature
1.245
1.235
1.225
1.215
1.205
1.195
FEEDBACK VOLTAGE (V)
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
Feedback Voltage vs
Temperature
-50 -25 -0 25 50 75 100 125 150 -60 -40 -20 0 20 40 60 80 100 120 140
Soft-Start
Waveforms
V
OUT
1V/Div.
I
L
1A/Div.
4ms/Div.
V
OUT
1V/Div.
I
L
1A/Div.
Turn Off
Waveforms
V
OUT
100mV/Div.
I
L
1A/Div.
V
IN
= 12V, V
OUT
= 3.3V, 1A - 2A STEP
Load Transient
Waveforms
EFFICIENCY (%)
100
95
90
85
80
75
70
65
60
55
50
LOAD CURRENT (mA)
Efficiency vs
Load Current
0 500 1000 1500 2000 2500 3000 3500
V
IN
= 9V
V
IN
= 12V
V
IN
= 24V
100
95
90
85
80
75
70
65
60
55
50
EFFICIENCY (%)
0 500 1000 1500 2000 2500 3000 3500
LOAD CURRENT (mA)
Efficiency vs
Load Current
V
IN
= 5V
V
IN
= 24V
V
IN
= 12V
I
L
1A/Div.
V
OUT
10mV/Div.
V
SW
10V/Div.
V
IN
100mV/Div.
Switching
Waveforms
MP1593 – 3A, 28V, 385kHz STEP-DOWN CONVERTER
MP1593 Rev. 2.11 www.MonolithicPower.com 5
1/10/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
PIN FUNCTIONS
Pin # Name Description
1 BS
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel MOSFET
switch. Connect a 10nF or greater capacitor from SW to BS to power the high-side switch.
2 IN
Power Input. IN supplies power to the IC. Drive IN with a 4.75V to 28V power source. Bypass IN
to GND with a suitably large capacitor to eliminate noise on the input to the IC. See Input
Capacitor.
3 SW
Power Switching Output. SW is the switching node that supplies power to the output. Connect
the output LC filter from SW to the output load. Note that a capacitor is required from SW to BS
to power the high-side switch.
4 GND Ground. Note: Connect the exposed pad to Pin 4.
5 FB
Feedback Input. FB senses the output voltage and regulates it. Drive FB with a resistive voltage
divider from the output voltage to ground. The feedback threshold is 1.222V. See Setting the
Output Voltage.
6 COMP
Compensation Node. COMP is used to compensate the regulation control loop. Connect a series
RC network from COMP to GND. In some cases, an additional capacitor from COMP to GND is
required. See Compensation.
7 EN
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on the
regulator; low to turn it off. An Under-Voltage Lockout (UVLO) function can be implemented by
the addition of a resistor divider from V
IN
to GND. For complete low current shutdown the EN pin
voltage needs to be less than 1.5V. For automatic startup leave EN disconnected.
8 SS
Soft-Start Control Input. SS controls the soft-start period. Connect a capacitor from SS to GND
to set the soft-start period. A 0.1μF capacitor sets the soft-start period to 10ms. To disable the
soft-start feature, leave SS disconnected.
MP1593 – 3A, 28V, 385kHz STEP-DOWN CONVERTER
MP1593 Rev. 2.11 www.MonolithicPower.com 6
1/10/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
OPERATION
LOCKOUT
COMPARATOR
ERROR
AMPLIFIER
FREQUENCY
FOLDBACK
COMPARATOR
INTERNAL
REGULATORS
1.8V
SLOPE
COMP
CLK
CURRENT
COMPARATOR
CURRENT
SENSE
AMPLIFIER
SHUTDOWN
COMPARATOR
SS
8
COMP
6
IN
2
EN
7
GND
4
OSCILLATOR
45/385KHz
S
R
Q
SW
3
BS
M1
M2
1
5V
+
Q
1.2V
+
+
2.60V/
2.39V
+
1.22V0.7V
+
+
FB
5
--
--
--
--
--
--
Figure 1—Functional Block Diagram
The MP1593 is a current-mode step-down
regulator. It regulates input voltages from 4.75V to
28V down to an output voltage as low as 1.22V,
and is able to supply up to 3A of continuous load
current.
The MP1593 uses current-mode control to
regulate the output voltage. The output voltage
is measured at FB through a resistive voltage
divider and amplified through the internal error
amplifier. The output current of the
transconductance error amplifier is presented at
COMP where a network compensates the
regulation control system. The voltage at COMP
is compared to the internally measured switch
current to control the output voltage.
The converter uses an internal N-Channel
MOSFET switch to step-down the input voltage
to the regulated output voltage. Since the
MOSFET requires a gate voltage greater than
the input voltage, a boost capacitor connected
between SW and BS drives the gate. The
capacitor is internally charged when SW is low.
An internal 10Ω switch from SW to GND is used
to insure that SW is pulled to GND when it is
low to fully charge the BS capacitor.
P1-P3P4-P6P7-P9P10-P12P13-P13

MP1593DN-LF-Z

Mfr. #:
Buy MP1593DN-LF-Z
Manufacturer:
Monolithic Power Systems (MPS)
Description:
Switching Voltage Regulators 3A 28V 385kHz Step-Down Converter
Lifecycle:
New from this manufacturer.
Delivery:
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