TPS61372 datasheet(21/35 Pages) TI1

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RESR

RUP

RDOWN

VOUT

VREF

GEA

COUT

ROUT

CIN

VIN

RSENSE

REA

TOFF

TPS61372

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SLVSEE7 – JUNE 2018

Product Folder Links: TPS61372

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RESR is the resistor in series with the output capacitor

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For the ceramic capacitor, the ESR ripple can be neglected. However, for the tantalum or electrolytic capacitors,

it must be considered if used.

Care must be taken when evaluating a ceramic capacitor’s derating under the DC bias. Ceramic capacitors can

derate by as much as 70% of its capacitance at its rated voltage. Therefore, enough margins on the voltage

rating should be considered to ensure adeqµAte capacitance at the required output voltage.

Table 4. Recommended Output Capacitor for TPS61372

PART NUMBER

C (μF)

Pieces

Description

SIZE

VENDOR(1)

GRM188R61E106MA73

X5R, 0603, 2.2μF, 25V,

+/- 20% tolerance

0603

Murata

9.2.3.3 Selecting the Input Capacitors

Multilayer ceramic capacitors are an excellent choice for the input decoupling of the step-up converter as they

have extremely low ESR and are available in small footprints. Input capacitors should be located as close as

possible to the device.

Take care when using only ceramic input capacitors. When a ceramic capacitor is used at the input and the

power is being supplied through long wires, such as from a wall adapter, a load step at the output can induce

ringing at the VIN pin. This ringing can couple to the output and be mistaken as loop instability or could even

damage the part. Additional "bulk" capacitance (electrolytic or tantalum) in this circumstance, should be placed

between CIN and the power source lead to reduce ringing that can occur between the inductance of the power

source leads and CIN.

9.2.3.4 Loop Stability and Compensation

9.2.3.4.1

Small Signal Model

The TPS61372 uses the adaptive off time with peak current control. With the inductor current information sensed,

the small-signal model of the power stage reduces from a two-pole system, created by L and COUT, to a single-

pole system, created by ROUT and COUT. An external loop compensation network connecting to the COMP pin of

TPS61372 is added to optimize the loop stability and the response time, a resistor RC, capacitor CC and CP

shown in comprises the loop compensation network.

Figure 16. TPS61372 Control Equivalent Circuitry Model

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