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參數(shù)資料
| 型號(hào)： | MP1531DQ |
| 廠商： | MONOLITHIC POWER SYSTEMS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Low Power, Triple Output Step-Up Plus Charge Pump for TFT Bias |
| 中文描述： | 0.65 A SWITCHING REGULATOR, 300 kHz SWITCHING FREQ-MAX, QCC16 |
| 封裝： | 3 X 3 MM, MO-220VEED-4, QFN-16 |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大小： | 359K |
| 代理商： | MP1531DQ |
MP1531 – LOW POWER, TRIPLE OUTPUT STEP-UP PLUS CHARGE PUMP FOR TFT BIAS
MP1531 Rev. 1.2
5/22/2006
www.MonolithicPower.com
9
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
To insure stable operation place the input
capacitor as close to the IC as possible.
Alternately a smaller high quality 0.1μF ceramic
capacitor may be placed closer to the IC if the
larger capacitor is placed further away.
Selecting the Rectifier Diodes
Schottky diodes are recommended for most
applications because of their fast recovery time
and low forward voltage. Use Schottky diodes
with a current rating equal to or greater than 4
times the average output current, and a voltage
rating at least 1.5 times V
GH
for the positive
charge-pump and V
GL
for the negative charge-
pump. 100mA Schottky diodes such as Central
Semiconductor CMPSH-3 are recommended
for low current charge-pump circuits.
Selecting the Output Capacitor of the Step-
Up Converter
The output capacitor is required to maintain the
DC output voltage. Low ESR capacitors are
preferred to keep the output voltage ripple to a
minimum. The characteristics of the output
capacitor also affect the stability of the
regulation control system. A 10-22μF ceramic
capacitor works well in most applications. In the
case of ceramic capacitors, the impedance of
the capacitor at the switching frequency is
dominated by the capacitance, and so the
output voltage ripple is mostly independent of
the ESR. The output voltage ripple is estimated
to be:
SW
MAIN
V
LOAD
IN
C
MAIN
V
RIPPLE
V
f
2
I
)
V
(
×
×
×
Where V
RIPPLE
is the output ripple voltage, I
LOAD
is the load current, and C2 is the capacitance of
the output capacitor of the step-up converter.
Selecting the Number of Charge-Pump
Stages
For highest efficiency, always choose the
lowest number of charge-pump stages that
meets the output requirement.
The number of positive charge-pump stages
N
POS
is approximately given by:
(
DROPOUT
GH
POS
V
)
D
MAIN
MAIN
V
V
2
V
V
N
×
+
Where V
D
is the forward voltage drop of the
charge-pump diode, and V
DROPOUT
is the
dropout margin for the linear regulator. The
positive charge-pump can also be configured
based on V
IN
for better efficiency. Then the
equation will be:
(
GH
POS
V
)
D
MAIN
IN
DROPOUT
2
V
V
V
V
N
×
+
The number of negative charge-pump stages
N
NEG
is approximately given by:
D
MAIN
V
DROPOUT
V
2
×
GL
NEG
V
V
N
+
Use V
DROPOUT
= 0.5V for positive charge-pump
and V
DROPOUT
= 0.15V for negative charge-pump.
Selecting the Flying Capacitor in Charge-
Pump Stages
Increasing the flying capacitor C
X
values
increases the output current capability. A
0.33μF ceramic capacitor works well in most
low current applications. The flying capacitor’s
voltage rating must exceed the following:
MAIN
V
CX
N
V
×
>
Where N is the stage number in which the flying
capacitor appears.
Step-Up Converter Compensation
The MP1531 uses current-mode control which
unlike voltage mode has only a single pole roll
off due to the output filter. The DC gain (A
V
DC
) is
equated from the product of current control to
output gain (A
V
CSCONTROL
), error amplifier gain
(A
V
EA
), and the feedback divider.
1
FB
EA
CSCONTROL
DC
A
Av
A
Av
×
×
=
LOAD
IN
CSCONTROL
I
V
4
A
×
=
MAIN
V
1
FB
1
FB
V
A
=
MAIN
V
LOAD
1
FB
IN
DC
I
V
V
×
1600
Av
×
×
=
The output filter pole is given in hertz by:
2
C
V
I
f
MAIN
LOAD
FILTERPOLE
×
×
π
=
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