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| 型号： | TPS5110PWG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封装： | GREEN, PLASTIC, TSSOP-24 |
| 文件页数： | 3/43页 |
| 文件大小： | 813K |
| 代理商： | TPS5110PWG4 |
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TPS5110
SLVS025B APRIL 2002 REVISED JULY 2004
11
www.ti.com
DETAILED DESCRIPTION
undervoltage lockout (UVLO)
When the REG5V_IN voltage decreases below about 4 V, the output stages of both the SBRC and the LDO are
turned off. This state is not latched and the operation recovers immediately after the input voltage becomes
higher than the turn-on value again. The typical hysteresis voltage is 100 mV.
UVLO for LDO
The LDO_IN voltage is monitored with a hysteretic comparator. When this voltage is less than 1 V, the UVLO
circuit disables the UVP/OVP comparators that monitor the INV_LDO voltage. In case the SBRC over current
protection is activated prior to that of the LDO’s, this protection function may also be observed.
LDO control
The LDO controller can drive an external N-channel MOSFET. This realizes a fast response as well as an
ultra-low dropout voltage regulator. For example, it is easy to configure both a 1.8-V and a 1.5-V high-current
power supply for core and I/O of modern digital processors, one from the SBRC and the other from the LDO.
The LDO_IN voltage range is from 1.1 V to 3.6 V, and the output voltage is adjustable from 0.9 V to 2.5 V by
an external resistor divider. Gain and phase of the high-speed error amplifier for this LDO control is internally
compensated and is connected to the 0.85-V band-gap reference circuit. The gate driver buffer is supplied by
VIN_SENSE voltage. In the relatively high-output voltage applications, make sure that output voltage plus
threshold voltage of the pass transistor is less than the minimum VIN. More precisely,
V
VIN_SENSE *
0.7 V
w V
THN )
V
LDO_OUT
where VTHN is the threshold voltage of N-channel MOSFET.
The LDO controller is also equipped with OVP, UVP, over current limit and overshoot protection functions.
overshoot protection LDO
In the event that load current changes from high to low very quickly, the LDO regulator output voltage may start
to overshoot. In order to resist this phenomenon, the LDO controller has an overshoot protection function. If the
LDO regulator output overshoots, the controller draws electrical charge out from LDO_OUT pin to hold it stable.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS5110PWR | 功能描述:DC/DC 开关控制器 Sync Buck w/NMOS LDO Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS5110PWRG4 | 功能描述:DC/DC 开关控制器 Sync Buck w/NMOS LDO Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS51113 | 制造商:TI 制造商全称:Texas Instruments 功能描述:SYNCHRONOUS BUCK CONTROLLER WITH HIGH-CURRENT GATE DRIVER |
| TPS51113DRCR | 功能描述:DC/DC 开关控制器 4.5-13.2V Synch Buck Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS51113DRCT | 功能描述:DC/DC 开关控制器 4.5-13.2V Synch Buck Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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