ml9266 Minilogic Device Corporation Limited., ml9266 Datasheet - Page 4

• Manufacturer Part Number: ml9266
• Description: Step-up Dc/dc Converter
• Manufacturer: Minilogic Device Corporation Limited.

IPCore
Vin
Vin
3.3V/5V
■ Applications
● High Current Application
● High Voltage Application
● Multi-Output Applications
Vin= 2.8 V ～ 5V Vout= 9 V
Vin=3.1V ～ 5V Vout=12V
1uF
C1
CE
CE
C4
100uF
R3
100
+
ML9266
CE
100uF
VDD
C5
GND
ML9266
VDD
+
GND
C2
10uF
ML9266
VDD
NMOS
GND
L1
3.3--10uH
EXT
FB
LX
Q1
RVDD
100
L1
3.3--10uH
EXT
FB
LX
L1
4.7uH
C2
1uF
EXT
FB
LX
CVDD
C7
1uF
D1
C8
1uF
C6
RM
C3
Q1
NMOS
1N5819
1N5819
980k/1M
1.6M/3M
Q1
NMOS
1N5819
R2
D1
D1
R1
R2
R2
R1
R1
C2
C3
10uF
C4
10uF
C5
10uF
RM=0.22
Vout2
+18V 10mA
R1=620K
R2=100
C6=0.1uF
C1=100uF
C2=1uF
C3=0.1uF
R1=860K/620K
R2=100K
CVDD=1uF
+
Vout
3.3V/5V
100uF
C1
Vout1
+9V 100mA
Vout3
-9V 10mA
12V / 9V
+
300mA
C1
P4 / 5
■ Application Note
● Output Voltage Setting
Referring to application circuits, the output voltage of the
switching regulator (V
●
Referring to application circuits, The selection of R1and
R2 based on the trade-off between quiescent current
consumption and interference immunity is stated below:
◆ Follow Equation A
◆
◆
◆
For applications without standby or suspend modes,
lower values of R1 and R2 are preferred. For applications
concerning the current consumption in standby or
suspend modes, the higher values of R1and R2 are
feedback needed. Such "high impedance loops" are
sensitive to any interference, which require careful
layout and avoid any interference, e.g. probing to FB pin.
Feedback Loop Design
Higher R reduces the quiescent current (Path current
recommended.
Lower R gives better noise immunity, and is less
sensitive to interference, layout parasitics, FB node
leakage, and improper probing to FB pins.
A proper value of feed forward capacitor parallel with
R1 can improve the noise immunity of the feedback
loops, especially in an improper layout. An empirical
suggestion is around 0~33pF for feedback resistors
of M , and 10nF~0.1µF for feedback resistors of tens
to hundreds K .
=1.25V/R2), however resistors beyond 5M
V
OUT1
= (1 +
R1
R2
OUT
) can be set
) × 1.25V
ML9266
Rev. D, May 2008
・・・A
are not