TPS40040 Series

2.25 to 5.5 V input, 300 kHz, synchronous buck controller with low pin count

Catalog

2.25 to 5.5 V input, 300 kHz, synchronous buck controller with low pin count

Part	Control Features	Output Configuration	Function	Number of Outputs	Mounting Type	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Operating Temperature [Min]	Operating Temperature [Max]	Supplier Device Package	Output Type	Frequency - Switching	Output Phases	Duty Cycle (Max)	Package / Case	Topology
Texas Instruments TPS40040DRBR	Enable	Positive	Step-Down	1	Surface Mount	2.25 V	5.5 V	-40 °C	125 ¯C	8-SON (3x3)	Transistor Driver	300 kHz	1	95 %	8-VDFN Exposed Pad	Buck
Texas Instruments TPS40040DRBTG4	Enable	Positive	Step-Down	1	Surface Mount	2.25 V	5.5 V	-40 °C	125 ¯C	8-SON (3x3)	Transistor Driver	300 kHz	1	95 %	8-VDFN Exposed Pad	Buck
Texas Instruments TPS40040DRBT	Enable	Positive	Step-Down	1	Surface Mount	2.25 V	5.5 V	-40 °C	125 ¯C	8-SON (3x3)	Transistor Driver	300 kHz	1	95 %	8-VDFN Exposed Pad	Buck

Catalog

2.25 to 5.5 V input, 300 kHz, synchronous buck controller with low pin count

Key Features

• 2.25-V to 5.5-V InputOutput Voltage from 0.6 V to 90% of VINHigh-Side Drive for N-Channel FETSupports Pre-Biased OutputsAdaptive Anti-Cross Conduction Gate Drive1%, 0.6-V ReferenceTwo Fixed Switching Frequency Versions, TPS40040 (300 kHz) and TPS40041 (600 kHz)Three Selectable Short Circuit Protection Levels of 105 mV, 180 mV and 310 mVHiccup Restart from FaultsVoltage Mode ControlActive Low EnableThermal Shutdown Protection at 145°C8-Pin, 3-mm × 3-mm SON with Ground Connection to Thermal PadAPPLICATIONSPoint of LoadTelecommunicationsDC to DC ModulesSet Top BoxesPowerPAD Is a trademark of Texas Instruments.Predictive Gate Drive Is a trademark of Texas Instruments.2.25-V to 5.5-V InputOutput Voltage from 0.6 V to 90% of VINHigh-Side Drive for N-Channel FETSupports Pre-Biased OutputsAdaptive Anti-Cross Conduction Gate Drive1%, 0.6-V ReferenceTwo Fixed Switching Frequency Versions, TPS40040 (300 kHz) and TPS40041 (600 kHz)Three Selectable Short Circuit Protection Levels of 105 mV, 180 mV and 310 mVHiccup Restart from FaultsVoltage Mode ControlActive Low EnableThermal Shutdown Protection at 145°C8-Pin, 3-mm × 3-mm SON with Ground Connection to Thermal PadAPPLICATIONSPoint of LoadTelecommunicationsDC to DC ModulesSet Top BoxesPowerPAD Is a trademark of Texas Instruments.Predictive Gate Drive Is a trademark of Texas Instruments.

Description

The TPS40040 and TPS40041 dc-to-dc controllers are designed to operate from a 2.25-V to 5.5-V input source. To reduce the number of external components, several operating parameters are fixed internally; namely, frequency, soft start time, and short circuit protection (SCP) levels. For example, the operating frequencies of TPS40040/1 are 300 kHz/600 kHz, respectively. One of three short circuit threshold levels may be selected by the addition of an external resistor from the COMP pin to circuit ground. During power on, and before the internal soft start commands the output voltage to rise, the TPS40040/1 enters a calibration cycle, measures the current out of the COMP pin, and selects an internal SCP threshold voltage. At the end of the 1.6-ms calibration time, the output voltage is allowed to rise for a 4-ms 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. The packaging of the TPS40040/1 is unique in that the PowerPAD™ is used as an electrical ground connection as well as a thermal connection. The TPS40040 and TPS40041 dc-to-dc controllers are designed to operate from a 2.25-V to 5.5-V input source. To reduce the number of external components, several operating parameters are fixed internally; namely, frequency, soft start time, and short circuit protection (SCP) levels. For example, the operating frequencies of TPS40040/1 are 300 kHz/600 kHz, respectively. One of three short circuit threshold levels may be selected by the addition of an external resistor from the COMP pin to circuit ground. During power on, and before the internal soft start commands the output voltage to rise, the TPS40040/1 enters a calibration cycle, measures the current out of the COMP pin, and selects an internal SCP threshold voltage. At the end of the 1.6-ms calibration time, the output voltage is allowed to rise for a 4-ms 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. The packaging of the TPS40040/1 is unique in that the PowerPAD™ is used as an electrical ground connection as well as a thermal connection.