MP1484 Просмотр технического описания (PDF) - Monolithic Power Systems
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MP1484 Datasheet PDF : 11 Pages
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MP1484 – 3A, 18V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER
PACKAGE REFERENCE
TOP VIEW
BS 1
IN 2
SW 3
GND 4
8 SS
7 EN
6 COMP
5 FB
EXPOSED PAD
ON BACKSIDE
CONNECT
TO GND PIN
Part Number* Package
Temperature
MP1484EN
SOIC8N
(Exposed Pad)
–20°C to +85°C
* For Tape & Reel, add suffix –Z (e.g. MP1484EN -Z)
For Lead Free, add suffix –LF (e.g. MP1484EN - LF-Z)
ABSOLUTE MAXIMUM RATINGS (1)
Supply Voltage VIN....................... –0.3V to +24V
Switch Voltage VSW................. –1V to VIN + 0.3V
Boost 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............................ 4.75V to 18V
Output Voltage VOUT .................... 0.925V to 20V
Ambient Operating Temp .............. –20°C to +85°C
Thermal Resistance (3) θJA θJC
SOIC8N(Exposed Pad) .......... 50 ...... 10... °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.
Parameter
Symbol Condition
Shutdown Supply Current
Supply Current
Feedback Voltage
Feedback Overvoltage Threshold
Error Amplifier Voltage Gain (4)
Error Amplifier Transconductance
High-Side/Low-Side Switch On-
Resistance (4)
VEN = 0V
VEN = 2.0V, VFB = 1.0V
VFB 4.75V ≤ VIN ≤ 18V
AEA
GEA ΔIC = ±10μA
High-Side Switch Leakage Current
Upper Switch Current Limit
VEN = 0V, VSW = 0V
Minimum Duty Cycle
Lower Switch Current Limit
From Drain to Source
COMP to Current Sense
Transconductance
GCS
Oscillation Frequency
Short Circuit Oscillation Frequency
Maximum Duty Cycle
Minimum On Time (4)
EN Shutdown Threshold Voltage
EN Shutdown Threshold Voltage
Hysterisis
Fosc1
Fosc2
DMAX
TON
VFB = 0V
VFB = 1.0V
VEN Rising
Min
0.900
3.8
300
1.1
Typ
0.3
1.3
0.925
1.1
400
820
85
0
5.3
0.9
5.2
340
110
90
220
1.5
220
Max
3.0
1.5
0.950
10
380
2.0
Units
μA
mA
V
V
V/V
μA/V
mΩ
μA
A
A
A/V
KHz
KHz
%
ns
V
mV
MP1484 Rev. 0.9
www.MonolithicPower.com
2
10/23/2008
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2008 MPS. All Rights Reserved.
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