TLVM13640 datasheet(28/43 Pages) TI2

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8.2.2 Design 2: Inverting Buck-Boost Regulator with a –5-V Output

Figure 8-12 shows the schematic diagram of a –5-V inverting buck-boost regulator with a switching frequency of

1 MHz. The input voltage range for the sample design is 12 V to 24 V.

PGND

AGND

VOUT

VLDOIN

VIN

PGND

VIN

CIN2

COUT

RFBB

TLVM13630

RRT

RENT

RENB

Optional

external bias

VIN(on) = 8.9 V

VCC

CIN1

VOUT

47 F

13 k

10 k

40.2 k

4.7 F

100 k

604 k

RFBT

PGND

1 F

CVCC

VIN = 12 V to 24 V

CIN3

10 F

VIN+

VIN–

–VOUT

IOUT(max) = –2 A

VOUT = –5 V

VOUT–

–VOUT

Optional

Schottky

Diode

Figure 8-12. Circuit Schematic

8.2.2.1 Design Requirements

For this design example, use the parameters listed in Table 8-3 as the input parameters and follow the design

procedures in Section 8.2.2.2.

Table 8-3. Design Example Parameters

DESIGN PARAMETER

VALUE

Input voltage

12 to 24 V

Output voltage

–5 V

Output current

0 A to 2 A

Switching frequency

1 MHz

Table 8-4 gives the selected module power-stage components with availability from multiple vendors. This

design uses an all-ceramic output capacitor implementation.

Table 8-4. List of Materials for Application Circuit 2

REFERENCE

DESIGNATOR

QTY

SPECIFICATION

MANUFACTURER(1)

PART NUMBER

CIN1, CIN2, CIN3

4.7 µF, 50 V, X7R, 1210, ceramic

Taiyo Yuden

UMK325B7475KN-TR

TDK

CGA6P3X7R1H475K250AB

4.7 µF, 50 V, X7S, 1206, ceramic

Murata

GCM31CC71H475KA03K

COUT1, COUT2

47 µF, 10 V, X7R, 1210, ceramic

Murata

GRM32ER71A476ME15L

AVX

1210ZC476MAT2A

CVCC

1 µF, 16 V, X7R, 0603, ceramic

Murata

GCM188R71C105KA64J

TLVM13630 36-V, 3-A synchronous buck module

Texas Instruments

TLVM13630RDLR

More generally, the TLVM13630 module is designed to operate with a wide range of external components

and system parameters. However, the integrated loop compensation is optimized for a certain range of output

capacitance.

TLVM13630

SLVSFT6B – MAY 2021 – REVISED JANUARY 2022

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