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参数资料
| 型号： | FAN5361UC19X |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 14/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1.9V 6-WLCSP |
| 标准包装： | 3,000 |
| 系列： | TinyBuck™ |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 1.9V |
| 输入电压： | 2.3 V ~ 5.5 V |
| 频率 - 开关： | 6MHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-UFBGA，WLCSP |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 6-WLCSP |
Applications Information
I OUT ( DC ) ?
Selecting the Inductor
The output inductor must meet both the required inductance
I RMS ?
2
? I 2
12
(8)
and the energy handling capability of the application. The
inductor value affects average current limit, the PWM-to-
PFM transition point, output voltage ripple, and efficiency.
The ripple current ( ? I) of the regulator is:
The increased RMS current produces higher losses through
the R DS(ON) of the IC MOSFETs, as well as the inductor DCR.
Increasing the inductor value produces lower RMS currents,
but degrades transient response. For a given physical
? ? ? IN
?
?
? I ?
V OUT
V IN
? V ? V OUT
? L ? f SW
?
?
(5)
inductor size, increased inductance usually results in an
inductor with lower saturation current and higher DCR.
Table 2 shows the effects of inductance higher or lower than
? I LIM ( PK ) ?
I MAX ( LOAD ) (6)
The maximum average load current, I MAX(LOAD), is related to
the peak current limit, I LIM(PK) by the ripple current, given by:
? I
2
The transition between PFM and PWM operation is
determined by the point at which the inductor valley current
crosses zero. The regulator DC current when the inductor
current crosses zero, I DCM , is:
the recommended 470nH on regulator performance.
Output Capacitor
Table 3 suggests 0402 capacitors. 0603 capacitors may
further improve performance in that the effective capacitance
is higher. This improves transient response and output ripple.
Increasing C OUT has no effect on loop stability and can
therefore be increased to reduce output voltage ripple or to
improve transient response. Output voltage ripple, ? V OUT , is:
? V OUT ? ? I ? ? ?
? ESR ? ?
I DCM ?
? I
2
(7)
?
?
1
8 ? C OUT ? f SW
?
?
(9)
The FAN5361 is optimized for operation with L = 470nH, but is
stable with inductances up to 1.2 ? H (nominal). Up to
2.2 ? H(nominal) may be used; however, in that case, V IN must
be greater than or equal to 2.7V. The inductor should be rated
to maintain at least 80% of its value at I LIM(PK) .
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.
Input Capacitor
The 2.2 ? F ceramic input capacitor should be placed as close
as possible between 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 C IN and the power source lead to
reduce ringing that can occur between the inductance of the
power source leads and C IN .
The effective capacitance value decreases as V IN increases
due to DC bias effects.
Table 2. Effects of Changes in Inductor Value (from 470nH Recommended Value) on Regulator Performance
Inductor Value
Increase
Decrease
I MAX(LOAD)
Increase
Decrease
? V OUT
Decrease
Increase
Transient Response
Degraded
Improved
Table 3. Recommended Passive Components and their Variation Due to DC Bias
Component Description
Vendor
Min.
Typ.
Max. (6)
Comment
L1
470nH, 2012,
90m ? ,1.1A
Murata LQM21PNR47MC0
Murata LQM21PNR54MG0
Hitachi Metals HSLI-201210AG-R47
300nH 470nH
520nH
Minimum value occurs
at maximum current
C IN
C OUT
2.2 ? F, 6.3V,
X5R, 0402
4.7 ? F, X5R,
0402
Murata or Equivalent
GRM155R60J225ME15
GRM188R60J225KE19D
Murata or Equivalent GRM155R60G475M
GRM155R60E475ME760
1.0 ? F
1.6 ? F
2.2 ? F
4.7 ? F
2.4 ? F
5.2 ? F
Decrease primarily due
to DC bias (V IN ) and
elevated temperature
Decrease primarily due
to DC bias (V OUT )
Note:
6. Higher inductance values are also acceptable. See “Selecting the Inductor” instructions in Applications Information.
? 2008 Fairchild Semiconductor Corporation
FAN5361 ? Rev. 1.1.3
14
www.fairchildsemi.com
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