参数资料
型号: FAN4855MTCX
厂商: Fairchild Semiconductor
文件页数: 2/12页
文件大小: 0K
描述: IC REG BST SYNC ADJ 0.5A 8TSSOP
产品变化通告: Product Discontinuation 03/Dec/2009
标准包装: 2,500
类型: 升压(升压)
输出类型: 可调式
输出数: 1
输出电压: 3 V ~ 5 V
输入电压: 1.6 V ~ 4.5 V
电流 - 输出: 500mA
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 8-TSSOP(0.173",4.40mm 宽)
包装: 带卷 (TR)
供应商设备封装: 8-TSSOP
Pin Con?guration
8-Pin TSSOP
V IN
SHDN
LBI
LB0
1
2
3
4
8
7
6
5
GND
V L
V OUT
FB
TOP VIEW
Pin Description
Pin
1
2
3
4
5
6
7
8
Name
V IN
SHDN
LBI
LBO
FB
V OUT
V L
GND
Function
Battery Input Voltage . Supplies the IC during start-up. After the output is running, the IC draws
power from V OUT .
Shut Down . Pulling this pin low shuts down the regulator, isolating the load from the input.
Low-Battery Input . Pulling this pin below 0.39V causes the LBO pin to go low.
Low-Battery Output . This pin provides an active low signal to alert the user when the LBI voltage
falls below its targeted value. The open-drain output can be used to reset a microcontroller.
Feedback Input . For setting the output voltage. Connect this pin to the resistor divider.
Boost regulator output . Output voltage can be set to be in the 3 to 5V range. Startup at moderate
load is achievable at input voltages around 1.35V.
Boost inductor connection . Connect an inductor between this pin and V IN . When servicing the
output supply, this pin pulls low, charging the inductor, then shuts off dumping the energy through
the synchronous recti?er to the output.
Ground of the IC .
Absolute Maximum Ratings
Absolute Maximum Ratings are those values, beyond which the device could be permanently damaged. Absolute max-
imum ratings are stress ratings only and functional device operation is not implied.
Parameter
V IN , V OUT Voltages (Relative to GND)
Switch Voltage (V L to GND)
Voltage on any other Pin
Peak Switch Current (Ipeak)
Output Current (I OUT )
Continuous Power Dissipation
Thermal Resistance ( θ JA )
Junction Temperature
Storage Temperature Range
Lead Temperature (soldering, 10s)
2
Min.
-0.3
-0.3
-0.3
-65
Max.
6.5
V OUT + 0.3
V OUT + 0.3
— Internally Limited —
500
525
124
150
150
300
Units
V
V
V
mA
mW
°C/W
°C
°C
°C
www.fairchildsemi.com
FAN4855 Rev. 1.0.1
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