VOUT (500 mV/div)

Time (50 µs/div)

VIN (500 mV/div)

IOUT (100 mA/div)

IN

OUT

EN

GND

OFF

ON

TLV733

COUT

1 µF

DC-DC

Converter

Load

VOUT

1.5 V

CIN

1 µF

VOUT

1.8 V

18

TLV733P

SBVS235C – OCTOBER 2014 – REVISED JULY 2019

www.ti.com

Product Folder Links: TLV733P

Submit Documentation Feedback

Copyright © 2014–2019, Texas Instruments Incorporated

8.2 Typical Applications

8.2.1 DC-DC Converter Post Regulation

Figure 35. DC-DC Converter Post Regulation

8.2.1.1 Design Requirements

Table 2. Design Parameters

PARAMETER

DESIGN REQUIREMENT

Input voltage

1.8 V, ±5%

Output voltage

1.5 V, ±1%

Output current

200-mA dc, 300-mA peak

Output voltage transient deviation

< 10%, 1-A/µs load step from 50 mA to 200 mA

Maximum ambient temperature

85°C

8.2.1.2 Design Considerations

Input and output capacitors are required to achieve the output voltage transient requirements. Capacitance

values of 1 µF are selected to give the maximum output capacitance in a small, low-cost package.

Figure 7 shows the 1.2-V option dropout voltage. Given that dropout voltages are higher for lower output-voltage

options, and given that the 1.2-V option dropout voltage is typically less than 300 mV at 125°C, then the 1.5-V

option dropout voltage is typically less than 300 mV at 125°C.

Verify that the maximum junction temperature is not exceeded by referring to Figure 34.

8.2.1.3 Application Curve

Figure 36. 1.8-V to 1.5-V Regulation at 300 mA