参数资料
型号: LTC3203BEDD-1#PBF
厂商: Linear Technology
文件页数: 9/16页
文件大小: 0K
描述: IC REG BST SWITCHED CAP 5V 10DFN
标准包装: 121
类型: 升压(升压),切换电容(充电泵)
输出类型: 固定
输出数: 1
输出电压: 5V
输入电压: 2.7 V ~ 5.5 V
PWM 型: Burst Mode?
频率 - 开关: 900kHz,1MHz
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: 10-WFDFN 裸露焊盘
包装: 管件
供应商设备封装: 10-DFN(3x3)
LTC3203/LTC3203-1
LTC3203B/LTC3203B-1
OPERATIO
When the output voltage drops enough to overcome the
burst comparator hysteresis, the part wakes up and com-
mences normal fixed frequency operation. The output
capacitor recharges and causes the part to re-enter the
Sleep state if the output load still remains less than the
Burst Mode threshold. This Burst Mode threshold varies
with V IN , V OUT and the choice of output storage capacitor.
Short-Circuit/Thermal Protection
The LTC3203/LTC3203-1/LTC3203B/LTC3203B-1 have
built-in short-circuit current limit as well as over-tempera-
ture protection. During a short-circuit condition, the chip
will automatically limit the output current to approximately
1A. At higher temperatures, or if the input voltage is high
enough to cause excessive self-heating of the part, the
thermal shutdown circuitry will shut down the charge
pump once the junction temperature exceeds approxi-
mately 150 ° C. It will enable the charge pump once the
junction temperature drops back to approximately 135 ° C.
The LTC3203/LTC3203-1/LTC3203B/LTC3203B-1 will
cycle in and out of thermal shutdown indefinitely without
latch-up or damage until the short circuit condition on
V OUT is removed.
Soft-Start
To prevent excessive current flow at V IN during start-up,
the LTC3203/LTC3203-1/LTC3203B/LTC3203B-1 have
built-in soft-start circuitry. Soft-start is achieved by in-
creasing the amount of current available to the output
charge storage capacitor linearly over a period of approxi-
mately 250 μ s.
32031fa
9
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