
MP1591 – 2A, 32V, 330KHz STEP-DOWN CONVERTER
MP1591 Rev. 2.3
9/27/2006
www.MonolithicPower.com
2
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
PACKAGE REFERENCE
Part Number*
MP1591DN
MP1591DS
Package
SOIC8E
SOIC8
Temperature
–40
°
C to +85
°
C
–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)
SOIC8 (w/ Exposed Pad) .......50...... 10...
°
C/W
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
Error Amplifier Voltage Gain
Error Amplifier Transconductance
High-Side Switch On Resistance
(4)
Low-Side Switch On Resistance
(4)
High-Side Switch Leakage Current
Current Limit
(5)
Current Sense to COMP
Transconductance
Oscillation Frequency
Short Circuit Oscillation Frequency
Maximum Duty Cycle
(4)
Minimum Duty Cycle
(4)
EN Shutdown Threshold Voltage
Enable Pull-Up Current
EN UVLO Threshold
EN UVLO Threshold Hysteresis
Symbol Condition
V
EN
=
0V
V
EN
= 5V, V
FB
= 1.4V
6.5V
≤
V
IN
≤
32V, V
COMP
< 2V
I
C
=
±
10μA
V
EN
= 0V, V
SW
= 0V
Min
1.202 1.230 1.258
400
500
700
120
8.5
0
2.5
3.6
Typ
20
1.0
Max
35
1.2
Units
μA
mA
V
V/V
μA/V
m
μA
A
1100
10
4.9
3.5
A/V
V
FB
= 0V
V
FB
= 1.0V
V
FB
= 1.5V
V
EN
= 0V
V
EN
Rising
280
0.8
2.4
330
35
90
1.2
1.8
2.6
250
380
0
1.6
2.8
KHz
KHz
%
%
V
μA
V
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