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參數(shù)資料
| 型號(hào)： | FAN5307SX |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High-Efficiency Step-Down DC-DC Converter |
| 中文描述： | 0.7 A SWITCHING REGULATOR, 1200 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | ROHS COMPLIANT, MO-178AA, SOT-23, 5 PIN |
| 文件頁數(shù)： | 9/12頁 |
| 文件大小： | 633K |
| 代理商： | FAN5307SX |
FAN5307
PRODUCT SPECIFICATION
REV. 1.0.2 6/22/04
9
Application Information
Adjustable Output Voltage Version
The output voltage for the adjustable version is set by the
external resistor divider, as shown below:
and is calculated as:
To reduce noise sensitivity, R1 + R2 should not exceed
800k
.
Inductor Selection
The inductor parameters directly related to device perfor-
mances are saturation current and dc resistance. The
FAN5307 operates with a typical inductor value of 10μH.
The lower the dc resistance, the higher the efficiency. For
saturation current, the inductor should be rated higher than
the maximum load current plus half of the inductor ripple
current that is calculated as follows:
where:
f = Switching Frequency
L = Inductor Value
I
L
= Inductor Ripple Current
Input Capacitor Selection
For best performances, a low ESR input capacitor is
required. A ceramic capacitor of at least 4.7μF, placed as
close to the input pin of the device is recommended.
Output Capacitor Selection
The FAN5307’s switching frequency of 1MHz allows the
use of a low ESR ceramic capacitor with a value of 10μF to
22μF. This provides low output voltage ripple. In power save
mode the output voltage ripple is independent of the output
capacitor value and the ripple is determined by the internal
comparator thresholds. The typical output voltage ripple at
light load is 1% of the nominal output voltage.
PCB Layout Recommendations
The inherently high peak currents and switching frequency
of the power supplies require a careful PCB layout design.
Therefore, use wide traces for the high current path and
place the input capacitor, the inductor, and the output capaci-
tor as close as possible to the integrated circuit terminals. For
the adjustable version the resistor divider should be routed
away from the inductor to avoid electromagnetic interfer-
ence.
The 6-lead MLP version of the FAN5307 separates the high
current ground from the reference ground, therefore it is
more tolerant to the PCB layout design and shows better per-
formance.
Inductor
Value
10μH
Vendor
Part Number
Performance
Sumida
CDRH5D28-100
CDRH5D18-100
CDRH4D28-100
LQH66SN100M
01L
CDRH3D16-6R8
CDRH4D18-100
CR32-100
CR43-100
LQH4C100K04
High
Efficiency
Murata
6.8μH
10μH
Sumida
Smallest
Solution
Murata
Table 1: Recommended Inductors
10
μ
H
10μF
4.7
μ
F
F
1
3
4
5
2
V
IN
V
OUT
GND
EN
FB
L
X
C
R1
R2
4.7pF
V
OUT
0.5V
1
R
1
R
2
------
+
×
=
I
L
V
OUT
1
----------------L
V
V
IN
(
)
–
f
×
×
=
Capacitor
Value
4.7μF
10μF
Vendor
Part Number
Taiyo
Yuden
JMK212BY475MG
JMK212BJ106MG
JMK316BJ106KL
C12012X5ROJ106K
C3216X5ROJ106M
GRM32DR60J226K
TDK
22μF
Murata
Table 2: Recommended Capacitors
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| FAN5308 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:800mA High-Efficiency Step-Down DC-DC Converter |
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