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| 型号： | FAN4860UC5X |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 15/19页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC 5V 0.2A 6WLCSP |
| 标准包装： | 3,000 |
| 系列： | TinyBoost™ |
| 类型： | 升压（升压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 2.3 V ~ 4.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 3MHz |
| 电流 - 输出： | 200mA |
| 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 |
Application Information
External Component Selection
Table 2 shows the recommended external components for
the FAN4860:
Table 2. External Components
REF Description Manufacturer
C EFF varies with manufacturer, dielectric material, case size,
and temperature. Some manufacturers may be able to
provide an X5R capacitor in 0402 case size that retains C EFF
>1.5 ? F with 5V bias; others may not. If this C EFF cannot be
economically obtained and 0402 case size is required, the IC
can work with the 0402 capacitor as long as the minimum
V IN is restricted to >2.7 V.
L1
C IN
1.0 μH, 0.8 A,
190 m ? , 0805
2.2 μF, 6.3 V, X5R,
0402
Murata LQM21PN1R0MC0,
or equivalent
Murata GRM155R60J225M
TDK C1005X5R0J225M
For best performance, a 10 V-rated 0603 output capacitor is
recommended (Kemet C0603C475K8PAC, or equivalent).
Since it retains greater C EFF under bias and over
temperature, output ripple can is reduced and transient
capability enhanced.
4.7 μF, 10 V, X5R,
0603 (4)
V RIPPLE ( P ? P ) ? t ON ?
C OUT
Kemet C0603C475K8PAC
C OUT
TDK C1608X5R1A475K
Note:
4. A 6.3 V-rated 0603 capacitor may be used for C OUT ,
such as Murata GRM188R60J225M. All datasheet
parameters are valid with the 6.3 V-rated capacitor.
Due to DC bias effects, the 10 V capacitor offers a
performance enhancement; particularly output ripple
Output Voltage Ripple
Output voltage ripple is inversely proportional to C OUT .
During t ON , when the boost switch is on, all load current is
supplied by C OUT .
I LOAD
(2)
and
t ON ? t SW ? D ? t SW ? ? ? 1 ?
?
?
V RIPPLE ( P ? P ) ? t SW ? ? ? 1 ?
? I LOAD
? C
and transient response, without any size increase.
Output Capacitance (C OUT )
Stability
The effective capacitance (C EFF ) of small, high-value,
ceramic capacitors decrease as their bias voltage increases,
as shown in Figure 50.
Therefore:
where:
?
?
?
?
V IN
V OUT
V IN
V OUT
?
?
? ?
? OUT
(3)
(4)
t SW ? 1
f SW
(5)
As can be seen from Equation 4, the maximum V RIPPLE
occurs when V IN is minimum and I LOAD is maximum.
Startup
Input current limiting is in effect during soft-start, which limits
the current available to charge C OUT . If the output fails to
achieve regulation within the time period described in the
soft-start section above; a FAULT occurs, causing the circuit
to shut down, then restart after a significant time period. If
C OUT is a very high value, the circuit may not start on the first
attempt, but eventually achieves regulation if no load is
present. If a high-current load and high capacitance are both
I OUT ? ? I LIM ( PK ) ? RIPPLE ? ?
2
V OUT
Figure 50. C EFF for 4.7 ? F, 0603, X5R, 6.3 V
(Murata GRM188R60J475K)
FAN4860 is guaranteed for stable operation with the
minimum value of C EFF (C EFF(MIN) ) outlined in Table 3.
Table 3. Minimum C EFF Required for Stability
present during soft-start, the circuit may fail to achieve
regulation and continually attempt soft-start, only to have
C OUT discharged by the load when in the FAULT state.
The circuit can start with higher values of C OUT under full
load if V IN is higher, since:
? I ? V IN
( 6)
? ?
Operating Conditions
V IN (V) I LOAD (mA)
C EFF(MIN) ( ? F)
Generally, the limitation occurs in BST Mode.
2.3 to 4.5
2.7 to 4.5
2.3 to 4.5
0 to 200
0 to 200
0 to 150
1.5
1.0
1.0
? 2010 Fairchild Semiconductor Corporation
FAN4860 ? Rev. 1.1.1
15
www.fairchildsemi.com
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