MP1492 – 2A, 4.2V-16V INPUT, FAST TRANSIENT SYNCHRONOUS STEP-DOWN CONVERTER
MP1492 Rev. 1.1 www.MonolithicPower.com 16
3/13/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
Table 6—700kHz Recommended Parameters
with External Ramp Compensation
Recommended Conditions: V
IN
=12V, I
OUT
=2A
V
OUT
(V)
L
(μH)
R1
(kΩ)
R2
(kΩ)
R4
(kΩ)
C4
(pF)
R7
(kΩ)
1.2 2.2 12.1 26.1 330 220 174
2.5 2.2 30 14.3 549 220 348
3.3 2.2 40.2 12.7 698 220 475
According to equation (22) and some design
abundance are reserved, recommended
maximum output capacitor value is shown in
Table 7.
Table 7—Recommended Maximum Output
Capacitor Value (F
S
=500 kHz)
Recommended Conditions: V
IN
=12V, I
OUT
=2A
V
OUT
(V)
1.2 1.8 2.5 3.3 5
C
O_MAX
(μF)
680 570 390 330 220
The detailed application schematic is shown in
Figure 11, 12 and Figure 13. The typical
performance and circuit waveforms have been
shown in the Typical Performance
Characteristics section. For more possible
applications of this device, please refer to related
Evaluation Board Data Sheets.
MP1492
1
5
8
6
7
3
4
2
BYP
EN
FB
SW
BST
GND
FREQ
IN
Figure 11—Typical Application Schematic with No External Ramp
MP1492
1
5
8
6
7
R9
0
3
4
2
BYP
EN
FB
SW
BST
GND
FREQ
IN
Figure 12—Typical Application Schematic with Low ESR Ceramic Capacitor
