参数资料
| 型号： | TPS81256SIPR |
| 厂商： | Texas Instruments |
| 文件页数： | 15/26页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC 5V 0.6A 9USIP |
| 标准包装： | 1 |
| 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： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 4MHz |
| 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： | 9-VBGA |
| 包装： | 标准包装 |
| 供应商设备封装： | 9-uSIP（2.6x2.9） |
| 其它名称： | 296-30558-6 |
SLVSAZ9A – JUNE 2012 – REVISED AUGUST 2013
INPUT CAPACITOR
In a dc/dc boost converter, since the input current is continuous, only minimum input capacitor is required. The
TPS8125x device integrates a low ESR decoupling capacitor to prevent large voltage transients that can cause
misbehavior of the device or interference in other circuits in the system.
For most applications, the input capacitor that is integrated into the TPS8125x should be sufficient. If the
application exhibits a noisy or erratic switching frequency, experiment with additional input capacitance to find a
remedy. Multilayer ceramic capacitors are an excellent choice for input decoupling of the step-up converter as
they have extremely low ESR and are available in small footprints. Additional input capacitors should be located
as close as possible to the device.
The TPS8125x uses a tiny ceramic input capacitor. When a ceramic capacitor is combined with trace or cable
inductance, such as from a wall adapter, a load step at the output can induce ringing at the VIN pin. This ringing
can couple to the output and be mistaken as loop instability or can even damage the part. In this circumstance,
additional "bulk" capacitance, such as electrolytic or tantalum, should be placed between the input of the
converter and the power source lead to reduce ringing that can occur between the inductance of the power
source leads and C I .
Copyright ? 2012–2013, Texas Instruments Incorporated
Product Folder Links: TPS81256
15
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