MP1591 – 2A, 32V, 330KHz STEP-DOWN CONVERTER
MP1591 Rev. 2.3 www.MonolithicPower.com 2
9/21/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
PACKAGE REFERENCE
Part Number* Package Temperature
MP1591DN SOIC8E
–40°C to +85°C
MP1591DS SOIC8
–40°C to +85°C
*
For Tape & Reel, add suffix –Z (eg. MP1591DN–Z)
For RoHS Compliant Packaging, add suffix –LF
(eg. MP1591DN–LF–Z)
ABSOLUTE MAXIMUM RATINGS
(1)
IN Supply Voltage........................ –0.3V to +34V
SW Voltage............................. –1V to V
IN
+ 0.3V
BS Voltage
....................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 ................................... 6.5V to 32V
Operating Temperature .............–40°C to +85°C
Thermal Resistance
(3)
θ
JA
θ
JC
SOIC8 (w/ Exposed Pad) ....... 50 ...... 10... °C/W
SOIC8..................................... 90 ...... 45... °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.
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 20 35 A
Supply Current V
EN
= 5V, V
FB
= 1.4V 1.0 1.2 mA
Feedback Voltage
6.5V ≤ V
IN
≤ 32V, V
COMP
< 2V
1.202 1.230 1.258 V
Error Amplifier Voltage Gain 400 V/V
Error Amplifier Transconductance
ΔI
C
= ±10A
500 700 1100 A/V
High-Side Switch On Resistance
(4)
120
m
Ω
Low-Side Switch On Resistance
(4)
8.5
Ω
High-Side Switch Leakage Current V
EN
= 0V, V
SW
= 0V 0 10 A
Current Limit
(5)
2.5 3.6 4.9 A
Current Sense to COMP
Transconductance
3.5 A/V
Oscillation Frequency 280 330 380 KHz
Short Circuit Oscillation Frequency V
FB
= 0V 35 KHz
Maximum Duty Cycle
(4)
V
FB
= 1.0V 90 %
Minimum Duty Cycle
(4)
V
FB
= 1.5V 0 %
EN Shutdown Threshold Voltage 0.8 1.2 1.6 V
Enable Pull-Up Current V
EN
= 0V 1.8 A
EN UVLO Threshold V
EN
Rising 2.4 2.6 2.8 V
EN UVLO Threshold Hysteresis 250 mV
BS
IN
SW
GND
REF
EN
COMP
FB
1
2
3
4
8
7
6
5
TOP VIEW
EXPOSED PAD
ON BACKSIDE
(SOIC8N ONLY)
CONNECT TO PIN 4
