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MP2451DT-LF-Z

P1-P3P4-P6P7-P9P10-P12P13-P15
MP2451
36V, 2MHz, 0.6A
Step-Down Converter
MP2451 Rev. 1.33 www.MonolithicPower.com
4/29/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
1
The Future of Analog IC Technology
DESCRIPTION
The MP2451 is a high frequency (2MHz) step-
down switching regulator with integrated
internal high-side high voltage power MOSFET.
It provides single 0.6A (or less) highly efficient
output with current mode control for fast loop
response.
The wide 3.3V to 36V input range
accommodates a variety of step-down
applications in automotive input environment. A
3μA shutdown mode quiescent current allows
use in battery-powered applications.
High power conversion efficiency over a wide
load range is achieved by scaling down the
switching frequency at light load condition to
reduce the switching and gate driving losses.
Frequency fold-back helps prevent inductor
current runaway during start-up. Thermal
shutdown provides reliable, fault-tolerant
operation.
The MP2451 is available in the cost-effective
SOT23-6 and TSOT23-6 packages.
FEATURES
• 130μA Operating Quiescent Current
• Wide 3.3V to 36V Operating Input Range
• 500mΩ Internal Power MOSFET
• 2MHz fixed Switching Frequency
• Internally compensated
• Stable with Ceramic Output Capacitors
• Internal Soft-Start
• Precision Current Limit Without Current
Sensing Resistor
• > 90% Efficiency
• Output Adjustable from +0.8V to 0.8xV
IN
• 3μA Low Shutdown Supply Current
• SOT23-6 and TSOT23-6 Packages
APPLICATIONS
• High Voltage Power Conversion
• Automotive Systems
• Industrial Power Systems
• Distributed Power Systems
• Battery Powered Systems
A
ll MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Quality Assurance. “MPS” and “The
Future of Analog IC Technology” are Registered Trademarks of Monolithi
c
Power Systems, Inc.
TYPICAL APPLICATION
MP2451
SW
VIN
EN
FB
GND
BST
1
5
6
3
4
C1
C3
33pF
C4
100nF
L1
D1
V
IN
V
OUT
5V/0.6A
Control
Efficiency
V
OUT
=5V
60
55
50
0 0.1 0.2 0.3 0.4 0.5 0.6
65
70
75
80
85
90
95
EFFICIENCY (%)
OUTPUT CURRENT(A)
V
IN
=8V
V
IN
=12V
V
IN
=36V
V
IN
=24V
MP245136V, 2MHz, 0.6A, STEP-DOWN CONVERTER
MP2451 Rev. 1.33 www.MonolithicPower.com
4/29/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
2
ORDERING INFORMATION
Part Number* Package Top Marking
MP2451DT SOT23-6 V7
MP2451DJ TSOT23-6 AML
* For Tape & Reel, add suffix –Z (e.g. MP2451DT–Z)
For RoHS Compliant Packaging, add suffix –LF (e.g. MP2451DT–LF–Z)
PACKAGE REFERENCE
BST
GND
FB
1
2
3
6
5
4
SW
VIN
EN
TOP VIEW
ABSOLUTE MAXIMUM RATINGS
(1)
Supply Voltage (V
IN
) ....................... -0.3V to 40V
Switch Voltage (V
SW
) ...... -0.3V to V
IN (MAX)
+ 0.3V
BST to SW ....................................... -0.3 to 6.0V
Enable (V
EN
) ..................................................8V
Enable Sink Current (I
EN
) ......................... 100μA
All Other Pins ................................ -0.3V to 5.0V
Continuous Power Dissipation (T
A
=+25°C)
(2)
.......................................................... 0.57W
Junction Temperature .............................. 150°C
Lead Temperature ................................... 260°C
Storage Temperature ................. -65°C to 150°C
Recommended Operating Conditions
(3)
Supply Voltage V
IN
.......................... 3.3V to 36V
Output Voltage V
OUT
.................. +0.8V to 0.8*V
IN
Operating Junction Temp. (T
J
). -40°C to +125°C
Thermal Resistance
(4)
θ
JA
θ
JC
SOT23-6 ............................... 220 .... 110 .. °C/W
TSOT23-6 ............................. 220 .... 110 .. °C/W
Notes:
1) Exceeding these ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature T
J
(MAX), the junction-to-
ambient thermal resistance θ
JA
, and the ambient temperature
T
A
. The maximum allowable continuous power dissipation a
t
any ambient temperature is calculated by P
D
(MAX)=(T
J
(MAX)-
T
A
)/ θ
JA
. Exceeding the maximum allowable power dissipation
will cause excessive die temperature, and the regulator will 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
operating conditions.
4) Measured on JESD51-7, 4-layer PCB.
MP245136V, 2MHz, 0.6A, STEP-DOWN CONVERTER
MP2451 Rev. 1.33 www.MonolithicPower.com
4/29/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
3
ELECTRICAL CHARACTERISTICS
V
IN
= 12V, V
EN
= 2V, T
A
= 25°C, unless otherwise noted.
Paramete
r
Condition Min Typ Max Units
Feedback Voltage 4.0V < V
IN
< 36V 0.778 0.794 0.810 V
3.3V < V
IN
< 4.0V 0.770 0.794 0.818 V
Upper Switch On Resistance V
BST
-V
SW
=5V 500 mΩ
Upper Switch Leakage V
EN
= 0V, V
SW
= 0V 0.1 1 μA
Current Limit 1.0 A
COMP to Current Sense
Transconductance
GCS
3 A/V
Minimum Operating V
IN
Voltage 3.3 V
V
IN
UVLO Up Threshold 2.7 3.2 V
V
IN
UVLO Hysteresis 0.4 V
Soft-start time FB from 0 to 1.8V 0.5 msec
Oscillator Frequency 1600 2000 2400 kHz
Minimum Switch On Time 100 ns
Shutdown Supply Current V
EN
= 0V 3 15 μA
Average Quiescent Supply Current No load, V
FB
=0.9 130 uA
Thermal Shutdown 150
°C
Enable up Threshold 1.4 1.55 1.7 V
Enable Threshold Hysteresis 0.3 V
Enable Clamping Voltage 7.5 V
PIN FUNCTIONS
Pin # Name Description
1 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.
2 GND
Ground. It should be connected as close as possible to the output capacitor avoiding
the high current switch paths.
3 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.
4 EN
Enable input. Pulling this pin below the specified threshold shuts the chip down. Pulling
it above the specified threshold enables the chip. Floating this pin shuts the chip down.
5 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 is required close to this pin
to reduce switching spikes.
6 SW
Switch node. This is the output from the high-side switch. A low V
F
Schottky diode to
ground is required close to this pin to reduce switching spikes.
P1-P3P4-P6P7-P9P10-P12P13-P15

MP2451DT-LF-Z

Mfr. #:
Buy MP2451DT-LF-Z
Manufacturer:
Monolithic Power Systems (MPS)
Description:
Switching Voltage Regulators 600mA 36V 2MHz Non-sync Buck
Lifecycle:
New from this manufacturer.
Delivery:
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