User Manual

MP2307 – 3A, 23V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER
MP2307 Rev. 1.9 www.MonolithicPower.com 2
5/28/2008 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2008 MPS. All Rights Reserved.
PACKAGE REFERENCE
BS
IN
SW
GND
SS
EN
COMP
FB
1
2
3
4
8
7
6
5
TOP VIEW
MP2307_PD01_SOIC8N
EXPOSED PAD
ON BACKSIDE
Part Number* Package Temperature
MP2307DN
SOIC8N
(Exposed Pad)
–40° to +85°C
*
For Tape & Reel, add suffix –Z (eg. MP2307DN–Z)
For Lead Free, add suffix –LF (eg. MP2307DN–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
.................... 0.925V to 20V
Ambient Operating Temp .............. –40°C to +85°C
Thermal Resistance
(3)
θ
JA
θ
JC
SOIC8N .................................. 50 ...... 10... °C/W
Maximum Power Dissipation Operating
(TA=25°C)
SOIC8N
(4)
, P
OUT
....................... .......... ........ 2W
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.
4) Derating 20mW/°C at TA > 25°C
ELECTRICAL CHARACTERISTICS
V
IN
= 12V, T
A
= +25°C, unless otherwise noted.
Parameter Symbol Condition Min Typ Max Units
Shutdown Supply Current V
EN
= 0V 0.3 3.0 µA
Supply Current V
EN
= 2.0V, V
FB
= 1.0V 1.3 1.5 mA
Feedback Voltage V
FB
4.75V ≤ V
IN
≤ 23V
0.900 0.925 0.950 V
Feedback Overvoltage Threshold 1.1 V
Error Amplifier Voltage Gain
(5)
A
EA
400 V/V
Error Amplifier Transconductance G
EA
∆I
C
= ±10µA
820 µA/V
High-Side Switch On-Resistance
(5)
R
DS(ON)1
100 m
Low-Side Switch On-Resistance
(5)
R
DS(ON)2
100 m
High-Side Switch Leakage Current V
EN
= 0V, V
SW
= 0V 0 10 µA
Upper Switch Current Limit Minimum Duty Cycle 4.0 5.8 A
Lower Switch Current Limit From Drain to Source 0.9 A
COMP to Current Sense
Transconductance
G
CS
5.2 A/V
Oscillation Frequency F
osc1
300 340 380 KHz
Short Circuit Oscillation Frequency F
osc2
V
FB
= 0V 110 KHz
Maximum Duty Cycle D
MAX
V
FB
= 1.0V 90 %
Minimum On Time
(5)
T
ON
220 ns
EN Shutdown Threshold Voltage V
EN
Rising 1.1 1.5 2.0 V
EN Shutdown Threshold Voltage
Hysterisis
220 mV