TPS40020PWPR

Frequency - Switching:	100kHz ~ 1MHz
Base Part Number:	TPS40020
Supplier Device Package:	16-HTSSOP
Package / Case:	16-TSSOP (0.173", 4.40mm Width) Exposed Pad
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Current Limit, Enable, Frequency Control, Power Good, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	Yes
Duty Cycle (Max):	95%
Series:	--
Voltage - Supply (Vcc/Vdd):	2.25 V ~ 5.5 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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The TPS40020PWPR is a current-mode DC-to-DC switching controller designed for synchronous buck applications up to 20 A. Incorporating a control loop, the device provides dynamic regulation of the output voltage and current, while switching at a constant frequency, to reduce noise in the system. Operating from a single power source, it is an ideal tool for point- of-load (POL) applications in markets such as industrial, computer, and consumer.

Introduced as part of the high-efficiency, high-density design strategy, the TPS40020PWPR supports wide input voltages from 4.5 V to 45 V and multiple output voltage settings from 0.6 V to 0.95 V with 12.5 V maximum. The device also includes a programmable soft-start feature and pre-biased output voltage to ensure system reliability and stability. Furthermore, protection features prevent device damage during overload operation.

The TPS40020PWPR is configurable via external pins or via serial interface and has a reference voltage of 0.8 V. The device also contains a temperature protected supply voltage and a programmable operating temperature range with an on-board thermal sensor. The operating frequency is adjustable with an external resistor, or via Serial Interface (I2C). Additionally, the switching frequency control allows the user to program the switching frequency that typically varies from 100 kHz to 650 kHz, with a 50 kHz minimum step size.

In terms of its application field, the TPS40020PWPR is particularly suitable for buffer, server, notebook, desktop, power, broadband and communication platform, automotive and industrial applications, due to its adjustable reference voltage and excellent line and load regulation, as well as its external MOSFET drive capabilities and precise voltage and current loop.

Regarding its working principle, the TPS40020PWPR works by sensing the output current and regulating it directly. The controller feeds back the output voltage signal to the voltage amplifier, which then compares it to the reference voltage. The error signal is then amplified by an operational amplifier and integrated to obtain the average output current. The resulting signal is then sent to the pulse-width modulator, which uses it to adjust the duty cycle of an switching waveform. This waveform is then sent to the external MOSFET to drive the output voltage. The control loop works continually to maintain the output voltage and current while A synchronous rectification scheme reduces power losses and improves efficiency.

In conclusion, the TPS40020PWPR is a versatile DC-to-DC switching controller suitable for high power synchronous buck applications up to 20 A. It is configurable via external pins or via serial interface and includes a wide range of features such as integrated protection, adjustable frequency and adjustable reference voltage. The device is also ideal for buffer, server, notebook, desktop, power, broadband and communication platform, automotive and industrial applications. Moreover, its current mode control makes it uniquely suited for converting power efficiently and accurately, while its synchronous rectification scheme greatly reduces power dissipation and improves efficiency.

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