TPS40042DRCT
ActiveLOW PIN COUNT, LOW VIN, SYNCHRONOUS BUCK DCDC CONTROLLER WITH TRACKING
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TPS40042DRCT
ActiveLOW PIN COUNT, LOW VIN, SYNCHRONOUS BUCK DCDC CONTROLLER WITH TRACKING
Technical Specifications
Parameters and characteristics for this part
| Specification | TPS40042DRCT |
|---|---|
| Clock Sync | False |
| Control Features | Enable |
| Duty Cycle (Max) | 95 % |
| Frequency - Switching | 600 kHz |
| Function | Step-Down |
| Mounting Type | Surface Mount |
| Number of Outputs | 1 |
| Operating Temperature [Max] | 85 °C |
| Operating Temperature [Min] | -40 °C |
| Output Configuration | Positive |
| Output Phases | 1 |
| Output Type | Transistor Driver |
| Package / Case | 10-VFDFN Exposed Pad |
| Supplier Device Package | 10-VSON (3x3) |
| Synchronous Rectifier | True |
| Topology | Buck |
| Voltage - Supply (Vcc/Vdd) [Max] | 5.5 V |
| Voltage - Supply (Vcc/Vdd) [Min] | 3 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Cut Tape (CT) | 1 | $ 2.94 | |
| 10 | $ 2.64 | |||
| 25 | $ 2.49 | |||
| 100 | $ 2.13 | |||
| Digi-Reel® | 1 | $ 2.94 | ||
| 10 | $ 2.64 | |||
| 25 | $ 2.49 | |||
| 100 | $ 2.13 | |||
| Tape & Reel (TR) | 250 | $ 2.00 | ||
| 500 | $ 1.75 | |||
| 1250 | $ 1.45 | |||
| 2500 | $ 1.35 | |||
| 6250 | $ 1.30 | |||
| Texas Instruments | SMALL T&R | 1 | $ 2.21 | |
| 100 | $ 1.83 | |||
| 250 | $ 1.31 | |||
| 1000 | $ 0.99 | |||
Description
General part information
TPS40042 Series
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 theEN(enable low) pin is allowed to float high, the TPS40042 remains OFF. Only when theENpin is pulled down towards ground is the controller allowed to start.
Documents
Technical documentation and resources