请参考 PDF 数据表获取器件具体的封装图。
TPS254900A-Q1 器件是一款具有电池短路保护功能的 USB 充电端口控制器和电源开关。该特性为 OUT、DM_IN 和 DP_IN 引脚提供保护。这三个引脚最高可承受 18V 电压。
当发生电池短路条件时,内部 MOSFET 迅速关断。迅速关断功能对于保护上行直流/直流转换器、处理器或集线器数据线路来说非常重要。
TPS254900A-Q1 具有低至 3.5V 的 UVLO 电压,因此电源开关在启动/停止期间不会关断。
TPS254900A-Q1 45mΩ 电源开关具有两个可选可调节电流限值,可通过在相邻端口承载高负载时切换至较低电流限值来支持端口电源管理。对于具有多个端口且上行电源容量有限的系统而言,这一功能非常重要。
TPS254900A-Q1 具有一个能够控制上行电源的电流检测输出,即使在充电电流过大时也能在 USB 端口保持 5V 的电压。该功能对于 USB 电缆较长的系统而言至关重要,因为在对便携式设备进行快速充电的过程中会产生大幅压降。
凭借电流监视器,系统能够通过监视 IMON 电压来实时监视负载电流。电流监视器非常有用,可用于端口电源动态管理。
TPS254900A-Q1 器件还为 DP_IN 和 DM_IN 引脚提供符合 IEC 61000-4-2 标准的 4 级 ESD 保护功能。
器件型号 | 封装 | 封装尺寸(标称值) |
---|---|---|
TPS254900A-Q1 | WQFN (20) | 4.00mm × 3.00mm |
Changes from Revision A (January 2018) to Revision B (July 2020)
Changes from Revision * (November 2017) to Revision A (January 2018)
PIN | TYPE(1) | DESCRIPTION | |
---|---|---|---|
NAME | NO. | ||
BIAS | 12 | PWR | Used for IEC protection. Typically, connect a 2.2-µF capacitor and a transient-voltage suppressor (TVS) to ground and 5.1 kΩ to OUT. |
CS | 6 | O | Linear cable compensation current. Connect to divider resistor of front-end dc-dc converter. |
CTL1 | 8 | I | Logic-level control input for controlling the charging mode and the signal switches; see the Device Truth Table (TT). |
CTL2 | 9 | I | Logic-level control input for controlling the charging mode and the signal switches; see the Device Truth Table (TT). |
DM_IN | 14 | I/O | D– data line to downstream connector |
DM_OUT | 4 | I/O | D– data line to upstream USB host controller |
DP_IN | 13 | I/O | D+ data line to downstream connector |
DP_OUT | 5 | I/O | D+ data line to upstream USB host controller |
EN | 7 | I | Logic-level control input for turning the power and signal switches on or off. When EN is low, the device is disabled, and the signal and power switches are OFF. |
FAULT | 18 | O | Active-low, open-drain output, asserted during overtemperature, overcurrent, and overvoltage conditions. |
GND | 11 | — | Ground connection; should be connected externally to the thermal pad. |
ILIM_HI | 20 | I | External resistor used to set the high current-limit threshold. |
ILIM_LO | 19 | I | External resistor used to set the low current-limit threshold and the load-detection current threshold. |
IMON | 1 | O | This pin sources a scaled-down ratio of current through the internal FET. A resistor from this pin to GND converts current to proportional voltage; used as an analog current monitor. |
IN | 2,3 | PWR | Input supply voltage; connect a 0.1-µF or greater ceramic capacitor from IN to GND as close to the IC as possible. |
OUT | 15,16 | PWR | Power-switch output |
OVP_SEL | 10 | I | Logic-level control input for choosing the OUT overvoltage threshold. When OVP_SEL is low, V(OV_OUT_LOW) is active. When OVP_SEL is high, V(OV_OUT_HIGH) is active. |
STATUS | 17 | O | Active-low open-drain output, asserted in load-detect conditions |
Thermal pad | — | — | Thermal pad on the bottom of the package |
MIN | MAX | UNIT | |||
---|---|---|---|---|---|
Voltage range | CS, CTL1, CTL2, EN, FAULT, ILIM_HI, ILIM_LO, IN, IMON, OVP_SEL, STATUS | –0.3 | 7 | V | |
DM_OUT, DP_OUT | –0.3 | 5.7 | |||
BIAS, DM_IN, DP_IN, OUT | –0.3 | 18 | |||
Continuous current | DM_IN to DM_OUT or DP_IN to DP_OUT | –100 | 100 | mA | |
OUT | Internally limited | ||||
Continuous output source current, ISRC | ILIM_HI, ILIM_LO, IMON | Internally limited | A | ||
Continuous output sink current, ISNK | FAULT, STATUS | 25 | mA | ||
CS | Internally limited | A | |||
Operating junction temperature, TJ | –40 | Internally limited | °C | ||
Storage temperature,Tstg | –65 | 150 | °C |
VALUE | UNIT | ||||
---|---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human-body model (HBM), per AEC Q100-002(1) | ±2000(2) | V | |
Charged-device model (CDM), per AEC Q100-011 | ±750(3) | ||||
IEC 61000-4-2 contact discharge | DP_IN and DM_IN pins(4) | ±8000 | |||
IEC 61000-4-2 air di scharge | DP_IN and DM_IN pins(4) | ±15000 |