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| 型号： | TPS62122DRV |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PDSO6 |
| 封装： | 2 X 2 MM, GREEN, PLASTIC, SON-6 |
| 文件页数： | 11/33页 |
| 文件大小： | 5549K |
| 代理商： | TPS62122DRV |
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www.ti.com
SLVSAD5 – JULY 2010
POWER GOOD OUTPUT
The Power Good Output is an open drain output available in TPS62120. The circuit is active once the device is
enabled. It is driven by an internal comparator connected to the FB voltage and internal reference. The PG
output provides a high level (open drain high impedance) once the feedback voltage exceeds typical 95% of its
nominal value. The PG output is driven to low level once the feedback voltage falls below typ. 90% of its nominal
value. The PG output is high (high impedance) with an internal delay of typically 2s. A pullup resistor is needed
to generate a high level and limit the current into the PG pin to 0.5mA. The PG pin can be connected via an pull
up resistors to a voltage up to 5.5V
The PG output is pulled low if the device is enabled but the input voltage is below the undervoltage lockout
threshold UVLO or the device is turned into shutdown mode.
SGND OPEN DRAIN OUTPUT
This is an NMOS open drain output with a typical RDS(on) of 370 and can be used to discharge the output
capacitor. The internal NMOS connects SGND pin to GND once the device is in shutdown mode or VIN falls
below the UVLO threshold during operation. SGND becomes high impedance once the device is enabled and VIN
is above the UVLO threshold. If SGND is connected to the output, the output capacitor is discharged through
SGND.
SHORT-CIRCUIT PROTECTION
The TPS6212X integrates a high-side MOSFET switch current limit ILIMF to protect the device against short
circuit. The current in the high-side MOSFET switch is monitored by current limit comparator and once the
current reaches the limit of ILIMF , the high-side MOSFET switch is turned off and the low-side MOSFET switch is
turned on to ramp down the inductor current. The high-side MOSFET switch is turned on again once the zero
current comparator trips and the inductor current has become zero. In this case, the output current is limited to
half of the high-side MOSFET switch current limit ILIMF.
THERMAL SHUTDOWN
As soon as the junction temperature, TJ, exceeds 150°C (typical) the device goes into thermal shutdown. In this
mode, the high-side and low-side MOSFETs are turned-off. The device continues its operation when the junction
temperature falls below the thermal shutdown hysteresis.
Copyright 2010, Texas Instruments Incorporated
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| TPS62122DRVR | 功能描述:直流/直流开关转换器 15V75mA96% Eff Step-Down Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| TPS62122DRVT | 功能描述:直流/直流开关转换器 15V75mA96% Eff Step-Down Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| TPS62122DRVT | 制造商:Texas Instruments 功能描述:IC SYNC BUCK DC/DC CONTROLLER 800KHZ 制造商:Texas Instruments 功能描述:IC, SYNC BUCK DC/DC CONTROLLER, 800KHZ, 6-SON |
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