TPS737 datasheet(20/50 Pages) TI2

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7 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

7.1 Application Information

The TPS737 low-dropout (LDO) regulator uses an NMOS pass transistor to achieve ultra-low-dropout

performance, reverse current blockage, and freedom from output capacitor constraints. These features,

combined with low noise and an enable input, make the TPS737 designed for portable applications. This

regulator offers a wide selection of fixed-output voltage versions and an adjustable-output version. All versions

have thermal and overcurrent protection, including foldback current-limit.

7.2 Typical Application

Figure 7-1 shows the basic circuit connections for the fixed-voltage models. Figure 7-2 gives the connections for

the adjustable output version (TPS73701).

TPS737xx

GND

OUT

OFF

Figure 7-1. Typical Application Circuit for Fixed-Voltage Versions

TPS73701

GND

OUT

OUT =

x1.204

1 + R2)

Optionalinputcapacitor.

Mayimprovesource

impedance,noise,orPSRR.

Outputcapacitor

mustbe

1.0 F.

Optionalcapacitor

reducesoutputnoise

andimproves

transientresponse.

OFF

Figure 7-2. Typical Application Circuit for Adjustable-Voltage Version

7.2.1 Design Requirements

R1 and R2 can be calculated for any output voltage using the formula shown in Figure 7-2. Sample resistor

values for common output voltages are given in Figure 6-2.

For best accuracy, make the parallel combination of R1 and R2 approximately equal to 19 kΩ. This 19 kΩ, in

addition to the internal 8-kΩ resistor, presents the same impedance to the error amp as the 27-kΩ band-gap

reference output. This impedance helps compensate for leakages into the error amplifier terminals.

7.2.2 Detailed Design Procedure

Provide an input supply with adequate headroom to account for dropout and output current to compensate for

the GND pin current and to power the load. Further, select adequate input and output capacitors as discussed in

the Input and Output Capacitor Requirements section.

TPS737

SBVS067W – JANUARY 2006 – REVISED AUGUST 2025

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