TPS40195 Series
4.5-V to 20-V, 20-A, synchronous buck controller with power good and synchronization
Manufacturer: Texas Instruments
Catalog(2 parts)
| Part | Frequency - Switching▲▼ | Frequency - Switching▲▼ | Topology | Function | Synchronous Rectifier▲▼ | Voltage - Supply (Vcc/Vdd)▲▼ | Voltage - Supply (Vcc/Vdd)▲▼ | Control Features | Operating Temperature▲▼ | Operating Temperature▲▼ | Supplier Device Package | Package / Case | Number of Outputs▲▼ | Output Type | Clock Sync▲▼ | Output Phases▲▼ | Mounting Type | Output Configuration | Package / Case▲▼ | Package / Case▲▼ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Texas Instruments TPS40195RGYTG4Buck Regulator Positive Output Step-Down DC-DC Controller IC 16-VQFN (4x3.5) | 600000 Hz | 100000 Hz | Buck | Step-Down | 4.5 V | 20 V | Current Limit, Enable, Frequency Control, Power Good, Soft Start | 85 °C | -40 °C | 16-VQFN (4x3.5) | 16-VFQFN Exposed Pad | 1 ul | Transistor Driver | 1 ul | Surface Mount | Positive | ||||
600000 Hz | 100000 Hz | Buck | Step-Down | 4.5 V | 20 V | Current Limit, Enable, Frequency Control, Power Good, Soft Start | 125 °C | -40 °C | 16-TSSOP | 16-TSSOP | 1 ul | Transistor Driver | 1 ul | Surface Mount | Positive | 0.004394200164824724 m | 0.004399999976158142 m |
Key Features
• Input Operating Voltage Range: 4.5 V to 20 VOutput Voltage as Low as 0.591 V ±0.5%180° Bi-Directional Out-of-Phase SynchronizationInternal 5-V RegulatorHigh and Low MOSFET Sense Overcurrent100-kHz to 600-kHz Switching FrequencyEnable and Power GoodProgrammable UVLO and HysteresisThermal Shutdown at 150°CSelectable Soft StartPrebias Output SafeInput Operating Voltage Range: 4.5 V to 20 VOutput Voltage as Low as 0.591 V ±0.5%180° Bi-Directional Out-of-Phase SynchronizationInternal 5-V RegulatorHigh and Low MOSFET Sense Overcurrent100-kHz to 600-kHz Switching FrequencyEnable and Power GoodProgrammable UVLO and HysteresisThermal Shutdown at 150°CSelectable Soft StartPrebias Output Safe
Description
AI
The TPS40195 is a flexible synchronous buck controller that operates from a nominal 4.5-V to 20-V supply. This controller implements voltage mode control with the switching frequency adjustable from 100 kHz to 600 kHz. Flexible features found on this device include selectable soft-start time, programmable short-circuit limit, programmable undervoltage lockout (UVLO) and synchronization capability. An adaptive anti-cross conduction scheme is used to prevent shoot through current in the power FETs. Overcurrent detection is done by sensing the voltage drop across the low-side MOSFET when it is on, and comparing it with a user-programmable threshold.
The threshold is set with a single external resistor connected from ILIM to GND. Pulse-by-pulse limiting (to prevent current runaway) is provided by sensing the voltage across the high-side MOSFET when it is on and terminating the cycle when the voltage drop rises above a fixed threshold of 550 mV. When the controller senses an output short circuit, both MOSFETs are turned off and a timeout period is observed before attempting to restart. This provides limited power dissipation in the event of a sustained fault. Synchronization on this device is bi-directional. Devices can be synchronized 180° out of phase to a chosen master TPS40195 running at a fixed 250 kHz or 500 kHz, or can be synchronized to an outside clock source anywhere in the 100 kHz to 600 kHz range.
The TPS40195 is a flexible synchronous buck controller that operates from a nominal 4.5-V to 20-V supply. This controller implements voltage mode control with the switching frequency adjustable from 100 kHz to 600 kHz. Flexible features found on this device include selectable soft-start time, programmable short-circuit limit, programmable undervoltage lockout (UVLO) and synchronization capability. An adaptive anti-cross conduction scheme is used to prevent shoot through current in the power FETs. Overcurrent detection is done by sensing the voltage drop across the low-side MOSFET when it is on, and comparing it with a user-programmable threshold.
The threshold is set with a single external resistor connected from ILIM to GND. Pulse-by-pulse limiting (to prevent current runaway) is provided by sensing the voltage across the high-side MOSFET when it is on and terminating the cycle when the voltage drop rises above a fixed threshold of 550 mV. When the controller senses an output short circuit, both MOSFETs are turned off and a timeout period is observed before attempting to restart. This provides limited power dissipation in the event of a sustained fault. Synchronization on this device is bi-directional. Devices can be synchronized 180° out of phase to a chosen master TPS40195 running at a fixed 250 kHz or 500 kHz, or can be synchronized to an outside clock source anywhere in the 100 kHz to 600 kHz range.