TPS62840 是一款高效降压转换器,具有典型值为 60nA 的超低工作静态电流。此器件具有特殊电路,可在 100% 模式下实现仅 120nA 的 IQ,因此可在放电末期进一步延长电池寿命。
此器件采用 DCS-Control 技术,可以为无线电提供干净的电源,工作时具有 1.8MHz 的典型开关频率。在省电模式下,此器件可将轻负载效率向下扩展至 1μA 负载电流及以下。
可以将一个电阻器连接到 VSET 引脚以选择 16 种预定义的输出电压,因此这款器件可以灵活地用于各种 应用 并最大限度地减少了外部组件的数量。
该器件的 STOP 引脚可立即消除所有的开关噪声,从而在测试和测量系统中执行无噪声测量。
TPS62840 提供了高达 750mA 的输出电流。此器件的输入电压为 1.8V 至 6.5V,支持多种电源,例如 2 节至 4 节碱性电池或 1 节至 2 节锂二氧化锰 (Li-MnO2) 或 1 节锂离子/锂亚硫酰氯 (Li-SOCl2) 电池。
器件型号 | 封装 | 封装尺寸(标称值) |
---|---|---|
TPS6284x | 8 引脚 DLC (SON) | 1.5mm x 2mm |
6 引脚 YBG (WCSP) | 0.97mm x 1.47mm | |
8 引脚 DGR (HVSSOP) | 3mm x 5mm |
Changes from C Revision (November 2019) to D Revision
Changes from B Revision (August 2019) to C Revision
Changes from A Revision (July 2019) to B Revision
PIN | I/O | DESCRIPTION | |||
---|---|---|---|---|---|
NAME | DLC
(SON-8) |
DGR
(HVSSOP-8) |
YBG
(WCSP-6) |
||
VIN | 2 | 6 | B1 | PWR | VIN power supply pin. Connect the input capacitor close to this pin for best noise and voltage spike suppression. A 4.7-µF ceramic capacitor is required. |
SW | 7 | 2 | B2 | PWR | The switch pin is connected to the internal MOSFET switches. Connect the inductor to this terminal. |
GND | 1 | 8 | A1 | PWR | GND supply pin. Connect this pin close to the GND terminal of the input and output capacitors. |
VSET | 5 | 4 | C2 | IN | Connecting a resistor to GND sets the output voltage when the converter is enabled. For the TPS62849, connect this pin to GND. |
VOS | 8 | 1 | A2 | IN | Output voltage sense pin for the internal feedback divider network and regulation loop. When the converter is disabled, this pin discharges VOUT by an internal MOSFET. Connect this pin directly to the output capacitor with a short trace. |
EN | 4 | 5 | C1 | IN | Enable pin. A high level enables the device and a low level turns the device off. The pin features an internal pulldown resistor, which is disabled once the device has started up and the output voltage is regulated. The pulldown resistor is activated again, once a low level has been detected. |
STOP | 6 | n/a | n/a | IN | STOP Switching pin. When this pin is logic high, the converter stops switching in order to provide a quiet supply rail. The output is powered from the charge available in the output capacitor. When this pin is logic low, the device immediately resumes operation. The pin features an internal pulldown resistor, which is disabled once a high level is detected at the input. The pulldown resistor is activated again, once a low level has been detected. |
MODE | 3 | 3 | n/a | IN | MODE pin. A low level enables Power-Save Mode operation with an automatic transition between PFM and PWM modes. A high level forces the converter to operated in PWM mode. This pin can be toggled during operation. It must be terminated. |
NC | n/a | 7 | n/a | This pin is not connected internally. Do not connect this pin. | |
EP | n/a | 9 | n/a | PWR | Exposed thermal pad(1). The PowerPAD must be connected to GND. |