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MP1541DJ-LF-P

P1-P3P4-P6P7-P9P10-P11
MP1541 – 1.3MHz BOOST CONVERTER
MP1541 Rev.1.5 www.MonolithicPower.com 4
9/5/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2017 MPS. All Rights Reserved.
ELECTRICAL CHARACTERISTICS
V
IN
= V
EN
= 5V, T
A
= +25C unless otherwise specified.
Parameters Symbol Condition Min Typ Max Units
Operating Input Voltage V
IN
2.5 6 V
Undervoltage Lockout 2.25 2.45 V
Undervoltage Lockout
Hysteresis
92 mV
Supply Current (Shutdown) V
EN
= 0V 0.1 1 µA
Supply Current (Quiescent) V
FB
= 1.3V 635 850 µA
Switching Frequency f
SW
1.0 1.3 1.6 MHz
Maximum Duty Cycle V
FB
= 0V 80 85 %
EN Threshold V
EN
Rising 1.0 1.3 1.6 V
EN Threshold V
EN
Rising, V
IN
= 2.5V 1.1 V
EN Hysteresis 100 mV
EN Input Bias Current V
EN
= 0V, 6V 1 µA
FB Voltage V
FB
1.21 1.25 1.29 V
FB Input Bias Current V
FB
= 1.25V –100 –30 nA
SW On-Resistance
(5)
R
DS (ON)
0.65
SW Current Limit
(5)
1.9 A
SW Leakage V
SW
= 15V 1 µA
Thermal Shutdown
(5)
160
C
Note:
5) Guaranteed by design.
MP1541 – 1.3MHz BOOST CONVERTER
MP1541 Rev.1.5 www.MonolithicPower.com 5
9/5/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2017 MPS. All Rights Reserved.
TYPICAL PERFORMANCE CHARACTERISTICS
1.40
1.35
1.30
1.25
1.20
1.15
FREQUENCY (MHz)
TEMPERATURE (°C)
MP1541-TPC02
Frequency vs
Temperature
640
635
630
625
620
615
610
TEMPERATURE (°C)
MP1541-TPC04
Supply Current vs
Temperature
1.6
1.5
1.4
1.3
1.2
1.1
1.0
CURRENT LIMIT (A)
4030 50 60 70 80
DUTY CYCLE (%)
MP1541-TPC06
Current Limit vs
Duty Cycle
84.1
84.0
83.9
83.8
83.7
83.6
83.5
MAXIMUM DUTY CYCLE (%)
-50 0 50 100 150 -50 0 50 100 150
TEMPERATURE (°C)
MP1541-TPC03
Maximum Duty Cycle vs
Temperature
0.80
0.75
0.70
0.65
0.60
0.55
0.50
23456
INPUT VOLTAGE (V)
MP1541-TPC05
R
DS
(
ON
)
vs
Input Voltage
-50 0 50 100 150
MP1541-TPC01
1.252
1.250
1.248
1.246
1.244
1.242
FEEDBACK VOLTAGE (V)
-50 0 50 100 150
TEMPERATURE (°C)
Feedback Voltage vs
Temperature
MP1541 – 1.3MHz BOOST CONVERTER
MP1541 Rev.1.5 www.MonolithicPower.com 6
9/5/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2017 MPS. All Rights Reserved.
PIN FUNCTIONS
Pin #
Name Function
TSSOT QFN
1 8 SW
Power Switch Output. SW is the drain of the internal MOSFET switch. Connect
the power inductor and output rectifier to SW. SW can swing between GND and
22V.
2 1,4 GND Ground.
3 5 FB Feedback Input. FB voltage is 1.25V. Connect a resistor divider to FB.
4 3 EN
Regulator On/Off Control Input. A high input at EN turns on the converter, and a
low input turns it off. When not used, connect EN to the input source for
automatic startup. The EN pin cannot be left floating.
5 2 IN Input Supply Pin. Must be locally bypassed.
N.A 6,7 N/C Do not connect. Reserved for factory use.
OPERATION
The MP1541 uses a fixed frequency, peak current
mode boost regulator architecture to regulate
voltage at the feedback pin. The operation of the
MP1541 can be understood by referring to the
block diagram of Figure 1. At the start of each
oscillator cycle the MOSFET is turned on through
the control circuitry. To prevent sub-harmonic
oscillations at duty cycles greater than 50 percent,
a stabilizing ramp is added to the output of the
current sense amplifier and the result is fed into
the negative input of the PWM comparator. When
this voltage equals the output voltage of the error
amplifier the power MOSFET is turned off. The
voltage at the output of the error amplifier is an
amplified version of the difference between the
1.25V bandgap reference voltage and the
feedback voltage. In this way the peak current
level keeps the output in regulation. If the
feedback voltage starts to drop, the output of the
error amplifier increases. This results in more
current to flow through the power MOSFET, thus
increasing the power delivered to the output.
The MP1541 has internal soft start to limit the
amount of input current at startup and to also
limit the amount of overshoot on the output. The
current limit is increased by a fourth every 40s
giving a total soft start time of 120s.
PWM
COMPARATOR
ERROR
AMPLIFIER
C
C
R
C
CONTROL
LOGIC
CURRENT
SENSE
AMPLIFIER
SW
M1
GND
+
-
1
FB
3
2
1.3MHz
OSC
+
-
-
+
+
1.25V
MP1541-F01-BD01
Figure 1—Functional Block Diagram
P1-P3P4-P6P7-P9P10-P11

MP1541DJ-LF-P

Mfr. #:
Buy MP1541DJ-LF-P
Manufacturer:
Monolithic Power Systems (MPS)
Description:
Switching Voltage Regulators 1.3MHz, 22V Step-up Converter
Lifecycle:
New from this manufacturer.
Delivery:
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