MPS MP1584, Руководство пользователя, Страница: 3 / 17

MP1584 – 3A, 1.5MHz, 28V STEP-DOWN CONVERTER
MP1584 Rev. 1.0 www.MonolithicPower.com
3
8/8/2011 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
ELECTRICAL CHARACTERISTICS
V
IN
= 12V, V
EN
= 2.5V, V
COMP
= 1.4V, T
A
= +25

C, unless otherwise noted.
Parameter Symbol Condition Min Typ Max Units
Feedback Voltage V
FB
4.5V < V
IN
< 28V 0.776 0.8 0.824 V
Upper Switch On Resistance R
DS(ON)
V
BST
– V
SW
= 5V 150 m Ω
Upper Switch Leakage V
EN
= 0V, V
SW
= 0V, V
IN
= 28V 1 μ A
Current Limit 4.0 4.7 A
COMP to Current Sense
Transconductance
G
CS
9 A/V
Error Amp Voltage Gain
(5)
200 V/V
Error Amp Transconductance I
COMP
= ±3µA 40 60 80 µA/V
Error Amp Min Source current V
FB
= 0.7V 5 µA
Error Amp Min Sink current V
FB
= 0.9V –5 µA
VIN UVLO Threshold 2.7 3.0 3.3 V
VIN UVLO Hysteresis 0.35 V
Soft-Start Time
(5)
0V < V
FB
< 0.8V 1.5 ms
Oscillator Frequency R
FREQ
= 100k Ω 900 kHz
Shutdown Supply Current V
EN
= 0V 12 20 µA
Quiescent Supply Current No load, V
FB
= 0.9V 100 125 µA
Thermal Shutdown 150

C
Thermal Shutdown Hysteresis 15

C
Minimum Off Time
(5)
100 ns
Minimum On Time
(5)
100 ns
EN Up Threshold 1.35 1.5 1.65 V
EN Hysteresis 300 mV
Note:
5) Guaranteed by design.