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MP2355 – 3A, 23V, 380KHz STEP-DOWN CONVERTER
MP2355 Rev. 1.5
5/1/2006
www.MonolithicPower.com
2
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
TM
PACKAGE REFERENCE
SS
BST
VIN
LX
RUN
COMP
FB
GND
1
2
3
4
8
7
6
5
TOP VIEW
MP2355_PD01-SOIC8N
EXPOSED PAD
ON BACKSIDE
CONNECT TO PIN 5
Part Number*
Package
SOIC8N
(Exposed Pad)
Temperature
MP2355DN
–40
°
C to +85
°
C
*
For Tape & Reel, add suffix –Z (eg. MP2355DN–Z)
For RoHS compliant packaging, add suffix –LF (eg.
MP2355DN –LF–Z)
ABSOLUTE MAXIMUM RATINGS
(1)
Supply Voltage V
IN
.......................–0.3V to +25V
Switch Voltage V
LX
.......................–0.3V to +26V
Boost Voltage V
BST
..........V
LX
– 0.3V to V
LX
+ 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 V
IN
............................4.75V to 23V
Operating Temperature .............–40
°
C to +85
°
C
Thermal Resistance
(3)
SOIC8N ..................................50...... 10...
°
C/W
θ
JA
θ
JC
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
V
IN
= 12V, T
A
= +25
°
C, unless otherwise noted.
Parameter
Shutdown Supply Current
Supply Current
Symbol Condition
V
RUN
=
0V
V
RUN
= 2.8, V
FB
= 1.5V
4.75V
≤
V
IN
≤
23V,
V
COMP
< 2V
A
VEA
Min
Typ
20
1.0
Max
30
1.2
Units
μA
mA
Feedback Voltage
V
FB
1.194
1.222
1.250
V
Error Amplifier Voltage Gain
Error Amplifier
Transconductance
High-Side Switch-On
Resistance
Low-Side Switch-On
Resistance
High-Side Switch Leakage
Current
Current Limit
(4)
Current Sense to COMP
Transconductance
Oscillation Frequency
Short Circuit Oscillation
Frequency
Maximum Duty Cycle
Minimum Duty Cycle
EN Shutdown Threshold
Voltage
400
V/V
G
EA
I
COMP
=
±
10μA
500
800
1120
μA/V
R
DS(ON)1
95
m
R
DS(ON)2
10
V
RUN
= 0V, V
LX
= 0V
0
10
μA
3.7
4.3
A
G
CS
3.8
A/V
f
S
330
380
430
KHz
V
FB
= 0V
20
35
50
KHz
D
MAX
D
MIN
V
FB
= 1.0V
V
FB
= 1.5V
90
%
%
0
0.9
1.2
1.5
V
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