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參數(shù)資料
| 型號(hào)： | LQH4C100K04 |
| 廠(chǎng)商： | Monolithic Power Systems, Inc. |
| 英文描述： | 1.6MHz Synchronous Step-Down plus 200mA LDO |
| 中文描述： | 1.6MHz的同步降壓型加200mA的LDO穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大小： | 475K |
| 代理商： | LQH4C100K04 |
MP2101 – 1.6MHz SYNCHRONOUS STEP-DOWN PLUS 200mA LDO
MP2101 Rev. 1.0
8/18/2006
www.MonolithicPower.com
9
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
TM
APPLICATION INFORMATION
Output Voltage Setting
The external resistor divider sets the output
voltage. The feedback resistor R1 of the switcher
also sets the feedback loop bandwidth with the
internal compensation capacitor (see Figure 1).
R1 of the switcher should be 300k
for optimal
transient response. R2 is then given by:
1
V
6
V
1
R
2
R
1
OUT
=
R4 of the LDO should be 60k
for good loop
response. R3 is then given by:
)
V
6
V
(
4
R
3
R
2
OUT
×
=
Table 1—Resistor Selection vs. Output
Voltage Setting
V
OUT
R1
R2
R3
60k
(1%)
90k
(1%)
120k
(1%)
190k
(1%)
R4
60k
(1%)
60k
(1%)
60k
(1%)
60k
(1%)
1.2V
300k
(1%)
300k
(1%)
1.5V
300k
(1%)
200k
(1%)
1.8V
300k
(1%)
150k
(1%)
2.5V
300k
(1%)
95.3k
(1%)
Inductor Selection
A 1μH to 10μH inductor with a DC current rating
of at least 25% higher than the maximum load
current is recommended for most applications.
For best efficiency, the inductor DC resistance
should
be
<200m
.
recommended inductors and manufacturers.
For most designs, the inductance value can be
derived from the following equation:
(
OUT
V
×
See
Table
2
for
)
OSC
f
L
IN
OUT
V
IN
I
V
V
L
×
×
=
Where
I
L
is inductor ripple current.
Choose the inductor ripple current to be
approximately 30% of the maximum load
current (800mA).
The maximum inductor peak current is:
2
I
I
I
L
LOAD
)
MAX
(
L
+
=
Under light load conditions below 100mA, larger
inductance is recommended for improved
efficiency. Table 3 lists inductors recommended
for this purpose.
Table 2—Suggested Surface Mount Inductors
Manufacturer
Sumida
Toko
Sumida
Part Number
CDRH2D11
D521C
CDRH3D16
Inductance (
μ
H)
2.2
2.2
2.2
Max DCR (
)
0.098
0.059
0.072
Saturation
Current (A)
1.27
1.63
1.20
Dimensions
LxWxH (mm
3
)
3.2 x 3.2 x 1.2
5 x 5 x 1.5
4 x 4 x 1.8
Table 3—Inductors for Improved Efficiency at 25mA, 50mA, under 100mA Load.
Manufacturer
Coilcraft
Murata
Sumida
Sumida
Part Number
DO1605T-103MX
LQH4C100K04
CR32-100
CR54-100
Inductance (
μ
H)
10
10
10
10
Max DCR (
)
0.3
0.2
0.2
0.1
Saturation
Current (A)
1.0
1.2
1.0
1.2
I
RMS
(A)
0.9
0.8
0.7
1.4
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