MP1484 – 3A, 18V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER
PACKAGE REFERENCE
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
TOP VIEW
BS
IN
1
2
3
4
8
7
6
5
SS
EN
SW
GND
COMP
FB
EXPOSED PAD
ON BACKSIDE
CONNECT
TO GND PIN
Thermal Resistance (3)
șJA
șJC
SOIC8N(Exposed Pad) ..........50...... 10... qC/W
Part Number*
Package
Temperature
Notes:
SOIC8N
(Exposed Pad)
MP1484EN
–20°C to +85°C
1) Exceeding these ratings may damage the device.
2) The device is not guaranteed to function outside of its
operating conditions.
For Tape & Reel, add suffix –Z (e.g. MP1484EN -Z)
For Lead Free, add suffix –LF (e.g. MP1484EN - LF-Z)
*
3) Measured on approximately 1” square of 1 oz copper.
ELECTRICAL CHARACTERISTICS
VIN = 12V, TA = +25°C, unless otherwise noted.
Parameter
Symbol Condition
Min
Typ
0.3
Max
3.0
Units
ȝA
Shutdown Supply Current
Supply Current
VEN = 0V
VEN = 2.0V, VFB = 1.0V
4.75V d VIN d 18V
1.3
1.5
mA
V
Feedback Voltage
VFB
0.900
0.925
1.1
0.950
Feedback Overvoltage Threshold
Error Amplifier Voltage Gain (4)
Error Amplifier Transconductance
V
AEA
GEA
400
820
V/V
ȝA/V
'IC = r10ȝA
High-Side/Low-Side Switch On-
Resistance (4)
85
mȍ
High-Side Switch Leakage Current
Upper Switch Current Limit
Lower Switch Current Limit
VEN = 0V, VSW = 0V
Minimum Duty Cycle
From Drain to Source
0
10
ȝA
A
3.8
5.3
0.9
A
COMP to Current Sense
Transconductance
GCS
5.2
A/V
Oscillation Frequency
Fosc1
Fosc2
300
340
110
90
380
2.0
KHz
KHz
%
Short Circuit Oscillation Frequency
Maximum Duty Cycle
Minimum On Time (4)
VFB = 0V
DMAX VFB = 1.0V
TON
220
1.5
ns
EN Shutdown Threshold Voltage
VEN Rising
1.1
V
EN Shutdown Threshold Voltage
Hysterisis
220
mV
MP1484 Rev. 0.9
10/23/2008
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2008 MPS. All Rights Reserved.
2
MPS [ MONOLITHIC POWER SYSTEMS ]
