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參數(shù)資料
| 型號： | FAN5362UMP29X |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.15 A SWITCHING REGULATOR, 3300 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 2 X 2 MM, MO-229VCCC, UMLP-6 |
| 文件頁數(shù)： | 2/14頁 |
| 文件大?。?/td> | 1165K |
| 代理商： | FAN5362UMP29X |
2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5362 Rev. 1.0.2
10
FAN5362
—
3MHz,
5
00mA
/
750mA
Synchronous
Buck
Regul
ator
Thermal Shutdown
When the die temperature increases, due to a high load
condition and/or a high ambient temperature, the output
switching is disabled until the temperature on the die has
fallen sufficiently. The junction temperature at which the
thermal shutdown activates is nominally 150°C with a 20°C
hysteresis.
Minimum Off-Time Effect on Switching
Frequency
tOFF(MIN) is 35ns. This imposes constraints on the maximum
IN
OUT
V
that the FAN5362 can provide, or the maximum
output voltage it can provide at low VOUT while maintaining a
fixed switching frequency in PWM mode.
When VIN is high, fixed switching is maintained as long as
7
.
0
1
)
(
SW
MIN
OFF
IN
OUT
f
t
V
.
The switching frequency drops when the regulator cannot
provide sufficient duty cycle at 3MHz to maintain regulation.
This occurs when VIN is below 3.3V at nominal load currents.
The calculation for switching frequency is given by:
MHz
3
,
t
1
min
f
)
MAX
(
SW
(4)
where:
OUT
ON
OUT
IN
OFF
OUT
)
MAX
(
SW
V
R
I
V
R
I
V
1
ns
35
t
(5)
where:
OFF
R
=
L
N
_
DSON
DCR
R
ON
R
=
L
P
_
DSON
DCR
R
Applications Information
Selecting the Inductor
The output inductor must meet both the required inductance
and the energy handling capability of the application.
The inductor value affects the average current limit, the
PWM-to-PFM transition point, the output voltage ripple, and
the efficiency.
The ripple current (I) of the regulator is:
SW
OUT
IN
OUT
f
L
V
I
(6)
The maximum average load current, IMAX(LOAD) is related to
the peak current limit, ILIM(PK) by the ripple current:
2
I
)
PK
(
LIM
)
LOAD
(
MAX
(7)
The FAN5362 is optimized for operation with L=1
H, but is
stable with inductances up to 1.5
H (nominal) and down to
470nH. The inductor should be rated to maintain at least
80% of its value at ILIM(PK). Failure to do so lowers the
amount of DC current that the IC can deliver.
Efficiency is affected by the inductor DCR and inductance
value. Decreasing the inductor value for a given physical size
typically decreases the DCR; but since I increases, the RMS
current increases, as do the core and skin effect losses.
12
I
2
)
DC
(
OUT
RMS
(8)
The increased RMS current produces higher losses through
the RDS(ON) of the IC MOSFETs as well as the inductor ESR.
Increasing the inductor value produces lower RMS currents,
but degrades transient response. For a given physical
inductor size, increased inductance usually results in an
inductor with lower saturation current and higher DCR.
Inductor Current Rating
The FAN5362’s current limit circuit can allow a peak current
of 1.25A to flow through L1 under worst-case conditions. If it
is possible for the load to draw that much continuous current,
the inductor should be capable of sustaining that current or
failing in a safe manner.
Output Capacitor
While 4.7
F capacitors are available in 0402 package size,
0603 capacitors are recommended due to the severe DC
voltage bias degradation in capacitance value that the
0402 exhibits.
Increasing COUT has no effect on loop stability and can
therefore be increased to reduce output voltage ripple or to
improve transient response. Output voltage ripple, VOUT, is:
ESR
f
C
8
1
I
V
SW
OUT
(9)
If values greater than 24
F of COUT are used, the regulator
may fail to start. See the sections on Enable and Soft Start
for more information.
Input Capacitor
The 2.2
F ceramic input capacitor should be placed as close
as possible to the VIN pin and GND to minimize the parasitic
inductance. If a long wire is used to bring power to the IC,
additional “bulk” capacitance (electrolytic or tantalum) should
be placed between CIN and the power source lead to reduce
ringing that can occur between the inductance of the power
source leads and CIN.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FAN5362UMP33X | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3MHz, 500mA/750mA Sync Buck Regulator RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| FAN5365 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:1A / 0.8A, 6MHz Digitally Programmable Regulator |
| FAN5365UC00X | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 0.8A 6MHz Digitally Programmable Reg. RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| FAN5365UC02X | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 0.8A 6MHz Digitally Programmable Reg. RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| FAN5365UC03X | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:1A / 0.8A, 6MHz Digitally Programmable Regulator |
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