TPS40042 - 低引脚数、低 Vin 同步降压 DCDC 控制器

TPS40042是TI德州仪器公司的一款无产品，TPS40042是低引脚数、低 Vin 同步降压 DCDC 控制器，本站介绍了TPS40042的封装应用图解、特点和优点、功能等，并给出了与TPS40042相关的TI元器件型号供参考。

TPS40042 - 低引脚数、低 Vin 同步降压 DCDC 控制器 - 无 - DDR存储器电源终端 - 德州仪器

产品描述

The TPS40042 DC/DC controller is designed to operate with an input source between a 3.0 V and 5.5 V. To reduce the number of external components, a number of operating parameters are fixed internally. The operating frequency for example, is internally set at 600 kHz.

One of three short circuit threshold levels may be selected by the addition of an external resistor from the COMP pin to circuit ground (no resistor is the default setting). During power on, and before the internal soft start commands the output voltage to rise, the TPS40042 enters a calibration cycle, measures the current out of the COMP pin, and selects an internal SCP threshold voltage. At the end of the 1.5-ms calibration time, the output voltage is allowed to enter soft-start. During operation, the selected SCP threshold voltage is compared to the upper MOSFET’s voltage drop during its ON time to determine whether there is an overload condition. If the voltage across the MOSFET exceeds the threshold voltage, the TPS40042 counts seven continuous pulses before shutting completely OFF for seven soft start charge/discharge cycles, after which, the TPS40042 attempts to restart the output.

During startup, both the high-side MOSFET switch and the synchronous rectifier are held in the OFF state until the internal soft start commands an output voltage higher than the voltage currently at the output. This may happen when the output is pre-biased at some voltage greater than zero and less than the desired regulation voltage. When the internal soft start first commands the output to rise, the pulse width of the synchronous rectifier is slowly increased from zero to the full 1-D conduction time by a number of discrete steps. In this way, inductor current is not allowed to reverse quickly, and ensures a monotonic startup of the output whether the output starts from zero or from a pre-bias level. If power is applied to the device while the EN (enable low) pin is allowed to float high, the TPS40042 remains OFF. Only when the EN pin is pulled down towards ground is the controller allowed to start.

产品特性

3.0-V to 5.5-V Input
External Reference required: 0.5 V to 1.5 V
Output Voltage from REFIN to 90% of VIN
High-Side Drive for N-Channel FET
Supports Pre-Biased Outputs
Adaptive Anti-Cross Conduction Gate Drive
Fixed switching frequency (600 kHz) Voltage Mode Control
Three Selectable Short Circuit Protection Levels
Hiccup Restart from Faults
Active Low Enable
Thermal Shutdown Protection at 145°C
10-Pin, 3-mm x 3-mm SON (DRC)
APPLICATIONS
- DDR Memory
- Point of Load
- Telecommunications
- DC to DC Modules

Predictive Gate Drive Is a trademark of Texas Instruments.

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