TPS62740DSST

Description

The TPS6274x series is the first step down converter with an ultra low quiescent current consumption (360nA typ.) and featuring TI's DCS-Control™ topology while maintaining a regulated output voltage. The device extends high efficiency operation to output currents down to a few micro amperes.

Detail Information

The TPS6274x is industry’s first step down converter featuring typ. 360nA quiescent current and operating with a tiny 2.2µH inductor and 10µF output capacitor. This new DCS-Control™ based device extends the light load efficiency range below 10µA load currents. TPS62740 supports output currents up to 300mA, TPS62742 up to 400mA. The device operates from rechargeable Li-Ion batteries, Li-primary battery chemistries such as Li-SOCl2, Li-MnO2 and two or three cell alkaline batteries. The input voltage range up to 5.5V allows also operation from a USB port and thin-film solar modules. The output voltage is user selectable by four VSEL pins within a range from 1.8V to 3.3V in 100mV steps. TPS6274x features low output ripple voltage and low noise with a small output capacitor. Once the battery voltage comes close to the output voltage (close to 100% duty cycle) the device enters no ripple 100% mode operation to prevent an increase of output ripple voltage. The device then stops switching and the output is connected to the input voltage. The integrated slew rate controlled load switch provides typ. 0.6Ω on-resistance and can distribute the selected output voltage to a temporarily used sub-system. The TPS6274x is available in a small 12 pin 2 × 3mm2 WSON package and supports a total solutions size of 31mm2.

Typical Application

Application Information

The TPS6274x devices are a step down converter family featuring typ. 360nA quiescent current and operating with a tiny 2.2µH inductor and 10µF output capacitor. This new DCS-ControlTM based devices extend the light load efficiency range below 10µA load currents. TPS62740 supports output currents up to 300mA, TPS62742 up to 400mA. The devices operate from rechargeable Li-Ion batteries, Li-primary battery chemistries such as LiSOCl2, Li-MnO2 and two or three cell alkaline batteries.

Layout Guidelines

As for all switching power supplies, the layout is an important step in the design. Care must be taken in board layout to get the specified performance. If the layout is not carefully done, the regulator could show poor line and/or load regulation, stability issues as well as EMI problems and interference with RF circuits. It is critical to provide a low inductance, impedance ground path. Therefore, use wide and short traces for the main current paths. The input capacitor should be placed as close as possible to the IC pins VIN and GND. The output capacitor should be placed close between VOUT and GND pins. The VOUT line should be connected to the output capacitor and routed away from noisy components and traces (e.g. SW line) or other noise sources. The exposed thermal pad of the package and the GND pin should be connected. See Figure 53 for the recommended PCB layout.

Features for the TPS62740

Input Voltage Range VIN from 2.2V to 5.5

Typ. 360nA Quiescent Current

Up to 90% Efficiency at 10µA Output Current

Up to 300mA / 400mA Output Current (TPS62740/TPS62742)

RF Friendly DCS-Control™

Up to 2 MHz Switching Frequency

Low Output Ripple Voltage

16 Selectable Output Voltages in 100mV Steps between

1.8V to 3.3V

Automatic Transition to No Ripple 100% Mode

Slew Rate Controlled Load Switch

Discharge Function on VOUT / LOAD

Power Good Output

Optimized for Operation with a Tiny 2.2µH Inductor

and 10µF COUT

Total Solution Size <31mm2

Small 2 × 3 mm2 WSON Package

TPS62740DSST Product Parameter

Manufacturer

Texas Instruments is a semiconductor multinational company in Texas, USA. It is famous for developing, manufacturing, and selling semiconductor and computer technology. It is mainly engaged in innovative digital signal processing and analog circuits. In addition to the semiconductor business, it also provides solutions including sensing and control, educational products and digital light source processing. Texas Instruments (TI) is headquartered in Dallas, Texas, USA, and has manufacturing, design or sales organizations in more than 25 countries.

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