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参数资料
| 型号： | TPS61105PW |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 800 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | PLASTIC, TSSOP-20 |
| 文件页数： | 26/29页 |
| 文件大小： | 426K |
| 代理商： | TPS61105PW |
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TPS61100
TPS61103
TPS61106
SLVS411 – JUNE 2002
6
www.ti.com
detailed description (continued)
power good
The PGOOD pin stays high impedance when the dc/dc converter delivers an output voltage within a defined
voltage window. So it can be used to enable the converter after pushbutton start-up, or to enable any connected
circuitry such as cascaded converters (LDO) or processor circuits.
power save mode
The SKIPEN pin can be used to select different operation modes. To enable power save, SKIPEN must be set
high. Power save mode is used to improve efficiency at light load. In power save mode the converter only
operates when the output voltage trips below a set threshold voltage. It ramps up the output voltage with one
or several pulses and goes again into power save mode once the output voltage exceeds the set threshold
voltage. This power save mode can be disabled by setting the SKIPEN to GND.
auto discharge
The auto discharge function is needed in applications where the supply voltage of a microcontroller,
microprocessor or memory has to be removed during shutdown in order to make sure that the system quickly
goes in a defined state. The auto discharge function is enabled when the ADEN is set high. It is disabled when
the ADEN is set to GND. When the auto discharge function is enabled, the output capacitor is discharged after
the device is programmed in the shutdown mode. The output capacitor is discharged by an integrated switch
of 400
, hence the discharge time depends on the size of the output capacitor.
low battery detector circuit—LBI/LBO
The low-battery detector circuit is typically used to supervise the battery voltage and to generate an error flag
when the battery voltage drops below a user-set threshold voltage. The function is active only when the device
is enabled. When the device is disabled, both LBO-pin are high-impedance. There are three programmed
thresholds, 400 mV, 450 mV, and 500 mV. The outputs on LBO1 and LBO2 are shown as follows:
LBI INPUT
(mV)
LBO1
LBO2
0–400
0
400–450
1
0
450–500
0
1
500–VBAT
1
1 means that the output stays at high-impedance and 0 means that the output goes active low. If there is only
one LBO output needed, both outputs can be tied together. Then the switching threshold is at 500 mV at LBI.
The battery voltage, at which the detection circuit switches, can be programmed with a resistive divider
connected to the LBI-pin. The resistive divider scales down the battery voltage to a voltage level of 400 mV
(450 mV, 500 mV), which is then compared to the LBI threshold voltage. The LBI-pin has a built-in hysteresis
of 10 mV. See the application section for more details about the programming of the LBI-threshold. If the
low-battery detection circuit is not used, the LBI-pin should be connected to GND (or to VBAT) and the LBO-pin
can be left unconnected. Do not let the LBI-pin float.
low-EMI switch
The device integrates a circuit that removes the ringing that typically appears on the SW-node when the
converter enters discontinuous current mode. In this case, the current through the inductor ramps to zero and
the rectifying PMOS switch is turned off to prevent a reverse current flowing from the output capacitors back
to the battery. Due to the remaining energy that is stored in parasitic components of the semiconductor and the
inductor, a ringing on the SW-pin is induced. The integrated antiringing switch clamps this voltage to VBAT and
therefore dampens ringing.
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相关代理商/技术参数 |
参数描述 |
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| TPS61106 | 制造商:TI 制造商全称:Texas Instruments 功能描述:DUAL-OUTPUT, SINGLE-CELL BOOST CONVERTER |
| TPS61106EVM-216 | 功能描述:电源管理IC开发工具 TPS61106-216 Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| TPS61106PW | 功能描述:直流/直流开关调节器 3.3V Hi-Eff Boost Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS61106PWG4 | 功能描述:直流/直流开关调节器 3.3V Hi-Eff Boost Converter RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| TPS61106PWR | 功能描述:开关变换器、稳压器与控制器 3.3V Hi-Eff Boost Converter RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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