MP1423 반도체 회로 부품 판매점
Step Down Converter
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 MPS |
TM
The Future of Analog IC Technology TM
MP1423
3A, 23V, 385KHz
Step-Down Converter
DESCRIPTION
The MP1423 is a step-down regulator with a
built in internal Power MOSFET. It achieves 3A
continuous output current over a wide input
supply range with excellent load and line
regulation.
Current mode operation provides fast transient
response and eases loop stabilization.
Fault condition protection includes cycle-by-cycle
current limiting and thermal shutdown.
Adjustable soft-start reduces the stress on the
input source at turn-on. In shutdown mode the
regulator draws 20µA of supply current.
The MP1423 requires a minimum number of
readily available external components to
complete a 3A step-down DC to DC converter
solution.
FEATURES
• 3A Output Current
• Programmable Soft-Start
• 110mΩ Internal Power MOSFET Switch
• Stable with Low ESR Output Ceramic Capacitors
• Up to 94% Efficiency
• 20µA Shutdown Mode
• Fixed 385KHz Frequency
• Thermal Shutdown
• Cycle-by-Cycle Over Current Protection
• Wide 6V to 23V Operating Input Range
• Output is Adjustable From 1.22V to 21V
• Under Voltage Lockout
APPLICATIONS
• Distributed Power Systems
• Battery Chargers
• Pre-Regulator for Linear Regulators
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
http://www.DataSheet4U.net/
TYPICAL APPLICATION
INPUT
6V to 23V
OPEN =
AUTOMATIC
STARTUP
2 1 10nF
7 IN
EN
BS 3
SW
MP1423
8
SS
GND
4
FB
COMP
5
6 B330A
10nF
OPEN
5.6nF
OUTPUT
2.5V
3A
MP1423_TAC01
Efficiency vs Load Current
100
VOUT=5.0V
90
80 VOUT=2.5V
70 VOUT=3.3V
60
50
0
VIN = 10V
0.5 1.0 1.5 2.0 2.5 3.0 3.5
LOAD CURRENT (A)
MP1423_EC01
MP1423 Rev. 1.1
1/6/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
1
datasheet pdf - http://www.DataSheet4U.net/
TM
MP1423 – 3A, 23V, 385KHz STEP-DOWN CONVERTER
PACKAGE REFERENCE
TOP VIEW
BS
IN
SW
GND
1
2
3
4
8 SS
7 EN
6 COMP
5 FB
EXPOSED PAD
(SOIC8N ONLY)
CONNECT TO PIN 4
MP1423_PD01
Part Number*
Package
Temp
MP1423DN
MP1423DP
SOIC8N
PDIP8
–40°C to +85°C
–40°C to +85°C
* For Tape & Reel, add suffix –Z (eg. MP1423DN–Z)
For Lead Free, add suffix –LF (eg. MP1423DN–LF–Z)
ABSOLUTE MAXIMUM RATINGS (1)
Supply Voltage VIN....................... –0.3V to +28V
Switch Voltage VSW................. –1V to VIN + 0.3V
Bootstrap Voltage VBS....VSW – 0.3V to VSW + 6V
All Other Pins................................. –0.3V to +6V
Junction Temperature...............................150°C
Lead Temperature ....................................260°C
Storage Temperature .............–65°C to +150°C
Recommended Operating Conditions (2)
Input Voltage VIN................................. 6V to 23V
Ambient Operating Temp ..........–40°C to +85°C
Thermal Resistance (3) θJA θJC
SOIC8N .................................. 50 ...... 10... °C/W
PDIP8 ..................................... 95 ...... 55... °C/W
Notes:
1) Exceeding these ratings may damage the device.
2) The device is not guaranteed to function outside of its
operating conditions.
3) Measured on approximately 1” square of 1 oz copper.
ELECTRICAL CHARACTERISTICS
VIN = 12V, TA = +25°C, unless otherwise noted.
Parameters
Symbol Condition
Shutdown Supply Current
Supply Current
Feedback Voltage
Error Amplifier Voltage Gain
Error Amplifier Transconductance
High-Side Switch-On Resistance
Low-Side Switch-On Resistance
High-Side Switch Leakage Current
Current Limit
VFB
AVEA
GEA
RDS(ON)1
RDS(ON)2
VEN
=
0Vhttp://www.DataSheet4U.net/
VEN = 2.8V, VFB =1.4V
6V ≤ VIN ≤ 23V
∆ICOMP = ±10µA
VEN = 0V, VSW = 0V
Current Sense to COMP
Transconductance
GCS
Oscillation Frequency
Short Circuit Oscillation Frequency
Maximum Duty Cycle
Minimum Duty Cycle
EN Threshold Voltage
fS
DMAX
VFB = 0V
VFB = 1.0V
VFB = 1.5V
Enable Pull-Up Current
Under Voltage Lockout Threshold
Under Voltage Lockout Threshold
Hysteresis
VEN = 0V
VIN Rising
Soft-Start Period
Thermal Shutdown
CSS = 0.1µF
Min
1.194
500
3.3
335
25
0.9
1.1
2.37
Typ
20
1.0
1.222
400
800
0.11
10
0
4.5
3.8
385
40
90
1.2
1.8
2.54
210
10
160
Max
30
1.2
1.250
1120
10
435
55
0
1.5
2.5
2.71
Units
µA
mA
V
V/V
µA/V
Ω
Ω
µA
A
A/V
KHz
KHz
%
%
V
µA
V
mV
ms
°C
MP1423 Rev. 1.1
1/6/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
2
datasheet pdf - http://www.DataSheet4U.net/
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MP1423 converter
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