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MP2309 – 1A, 23V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER
MP2309 Rev. 1.4
3/13/2006
www.MonolithicPower.com
2
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
TM
PACKAGE REFERENCE
BS
IN
SW
GND
SS
EN
COMP
FB
1
2
3
4
8
7
6
5
TOP VIEW
MP2309_PD01_SOIC8
Part Number*
MP2309DS
Package
SOIC8
Temperature
–40° to +85°C
*
For Tape & Reel, add suffix –Z (eg. MP2309DS–Z)
For Lead Free, add suffix –LF (eg. MP2309DS–LF–Z)
ABSOLUTE MAXIMUM RATINGS
(1)
Supply Voltage V
IN
.......................–0.3V to +26V
Switch Voltage V
SW
.................. –1V 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)
Input Voltage V
IN
............................4.75V to 23V
Output Voltage V
OUT
....................0.923V to 20V
Ambient Operating Temperature.... –40°C to +85°C
Thermal Resistance
(3)
SOIC8.....................................90...... 45...
°
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
Feedback Voltage
Feedback Overvoltage Threshold
Error Amplifier Voltage Gain
(4)
Error Amplifier Transconductance
High-Side Switch On Resistance
(4)
Low-Side Switch On Resistance
(4)
High-Side Switch Leakage Current
Upper Switch Current Limit
Lower Switch Current Limit
COMP to Current Sense
Transconductance
Oscillation Frequency
Short Circuit Oscillation Frequency
Maximum Duty Cycle
Minimum On Time
(4)
EN Shutdown Threshold
EN Shutdown Threshold Hysteresis
EN Lockout Threshold Voltage
EN Lockout Hysteresis
Symbol Condition
V
EN
= 0V
V
EN
= 2.0V, V
FB
= 1.0V
V
FB
4.75V
≤
V
IN
≤
23V
A
EA
G
EA
I
C
=
±
10μA
R
DS(ON)1
R
DS(ON)2
V
EN
= 0V, V
SW
= 0V
Minimum Duty Cycle
From Drain to Source
Min
0.900
1.4
Typ
1
1.3
0.923
1.1
400
800
140
140
2
0.8
Max
3.0
1.5
0.946
10
Units
μA
mA
V
V
V/V
μA/V
m
m
μA
A
A
G
CS
2.4
A/V
F
osc1
F
osc2
D
MAX
V
FB
= 0V
V
FB
= 0.8V
V
EN
Rising
340
100
90
220
1.5
210
2.5
210
KHz
KHz
%
nS
V
mV
V
mV
1.1
2.2
2.0
2.7
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