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参数资料
| 型号： | FAN4860UMP5X |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 14/19页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC 5V 0.2A 6UMLP |
| 标准包装： | 1 |
| 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-UDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 6-UMLP（2x2） |
| 其它名称： | FAN4860UMP5XDKR |
Fault State
The regulator enters the FAULT state under any of the
following conditions:
The V IN -dependent LIN Mode charging current is illustrated
in Figure 49.
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?
?
?
V OUT fails to achieve the voltage required to advance from
LIN state to SS state.
V OUT fails to achieve the voltage required to advance from
SS state to BST state.
Sustained (32 CLK counts) pulse-by-pulse current limit
during the BST state.
The regulator moves from BST to LIN state due to a short
circuit or output overload (V OUT < V IN -1 V).
Once a fault is triggered, the regulator stops switching and
presents a high-impedance path between V IN and V OUT . After
waiting 480 CLK counts, a restart is attempted.
Figure 49. LIN Mode Current vs. V IN
Soft-Start and Fault Timing
The soft-start timing for each state, and the fault times, are
determined by the fault clock, whose period is inversely
proportional to V IN . This allows the regulator more time to
charge larger values of C OUT when V IN is lower. With higher
V IN , this also reduces power delivered to V OUT during each
cycle in current limit.
The number of clock counts for each state is illustrated in
Figure 47.
Over-Temperature Protection (OTP)
The regulator shuts down when the thermal shutdown
threshold is reached. Restart, with soft-start, occurs when
the IC has cooled by about 30°C.
Over-Current Protection (OCP)
During Boost Mode, the FAN4860 employs a cycle-by-cycle
peak current limit to protect switching elements. Sustained
current limit, for 32 consecutive fault clock counts, initiates a
fault condition.
During an overload condition, as V OUT collapses to
approximately V IN -1 V, the synchronous rectifier is
immediately switched off and a fault condition is declared.
Automatic restart occurs once the overload/short is removed
and the fault timer completes counting.
Figure 47. Fault Response into Short Circuit
The fault clock period as a function of V IN is shown in Figure 48.
Figure 48. Fault Clock Period vs. V IN
? 2010 Fairchild Semiconductor Corporation
FAN4860 ? Rev. 1.1.1
14
www.fairchildsemi.com
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