MP18561 – 3A, 28V, 385KHz STEP-DOWN CONVERTER
PACKAGE REFERENCE
TOP VIEW
BS
IN
SW
GND
1
2
3
4
8
7
6
5
SS
EN
COMP
FB
ABSOLUTE MAXIMUM RATINGS
(1)
Supply Voltage V
IN
......................... –0.3V to 30V
Switch Voltage V
SW
.............. –0.5V to V
IN
+ 0.3V
Boost Voltage V
BS
..........V
SW
– 0.3V to V
SW
+ 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)
EXPOSED PAD
ON BACKSIDE
CONNECT TO PIN 4
MP1593_PD01_SOIC8N
Input Voltage V
IN
............................ 4.75V to 28V
Ambient Operating Temp............. –40°C to +85°C
Thermal Resistance
Part Number*
MP18561DN
*
Package
SOIC8N
(Exposed Pad)
Temperature
–40°C to +85°C
(3)
SOIC8N (w/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.
θ
JA
θ
JC
For Tape & Reel, add suffix –Z (eg. MP18561DN–Z)
For Lead Free, add suffix –LF (eg. MP18561DN–LF–Z)
ELECTRICAL CHARACTERISTICS
V
IN
= 12V, T
A
= +25°C, unless otherwise noted.
Parameter
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
Current Sense to COMP
Transconductance
Oscillation Frequency
Short Circuit Oscillation
Frequency
Maximum Duty Cycle
Minimum Duty Cycle
Symbol Condition
V
EN
= 0V
V
EN
= 2.6V, V
FB
= 1.4V
V
FB
A
EA
G
EA
R
DS(ON)1
R
DS(ON)2
V
EN
= 0V, V
SW
= 0V
3.3
G
CS
f
OSC1
f
OSC2
D
MAX
D
MIN
V
FB
= 0V
V
FB
= 1.0V
V
FB
= 1.5V
335
25
ΔI
COMP
=
±10μA
500
4.75V
≤
V
IN
≤
28V
V
COMP
< 2V
Min
Typ
20
1.0
1.222
400
800
100
10
0
4.7
6.2
385
45
90
0
435
60
10
6.5
1120
140
Max
30
1.2
1.250
Units
μA
mA
V
V/V
μA/V
mΩ
Ω
μA
A
A/V
KHz
KHz
%
%
1.194
MP18561 Rev. 0.1
12/12/2007
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
2
MPS [ MONOLITHIC POWER SYSTEMS ]
