8 Detailed Description

8.1 Overview

The TLVM13640 is an easy-to-use, synchronous buck DC/DC power module designed for a wide variety of

applications where reliability, small solution size, and low EMI signature are of paramount importance. With

integrated power MOSFETs, a buck inductor, and PWM controller, the TLVM13640 operates over an input

voltage range of 3 V to 36 V with transients as high as 42 V. The module delivers up to 6-A DC load current with

high conversion efficiency and ultra-low input quiescent current in a very small solution footprint. Control loop

compensation is not required, reducing design time and external component count.

With a programmable switching frequency from 200 kHz to 2.2 MHz using its RT pin, the TLVM13640

incorporates specific features to improve EMI performance in noise-sensitive applications:

• An optimized package and pinout design enables a shielded switch-node layout that mitigates radiated EMI.

• Parallel input and output paths with symmetrical capacitor layouts minimize parasitic inductance, switch-

voltage ringing, and radiated field coupling

• Resistor-programmable switch-node slew rate

• Clock synchronization and FPWM mode enable constant switching frequency across the load current range.

• Integrated power MOSFETs with enhanced gate drive control enable low-noise PWM switching.

Together, these features significantly reduce EMI filtering requirements, while helping to meet CISPR 11 and

CISPR 32 Class B EMI limits for conducted and radiated emissions.

The TLVM13640 module also includes inherent protection features for robust system requirements:

• An open-drain PGOOD indicator for power-rail sequencing and fault reporting

• Precision enable input with hysteresis, providing:

– Programmable line undervoltage lockout (UVLO)

– Remote ON/OFF capability

• Internally fixed output-voltage soft start with monotonic start-up into prebiased loads

• Hiccup-mode overcurrent protection with cycle-by-cycle peak and valley current limits

• Thermal shutdown with automatic recovery.

Leveraging a pin arrangement designed for simple layout that requires only a few external components, the

TLVM13640 is specified to maximum ambient and junction temperatures of 105°C and 125°C, respectively.

8.2 Functional Block Diagram

PG

PGND

VCC

VOUT1, VOUT2

AGND

FB

EN

PGOOD

logic

+

VREF

Comp

Power

stage

and

control

logic

Shutdown

logic

OCP

UVLO

Oscillator

Soft start

LDO bias

subregulator

Enable

logic

2.2 µH

SW

VIN1, VIN2

RT

VLDOIN

OTP

EN

OTP

OCP

UVLO

Optional

external bias

(from VOUT)

PGOOD

indicator

Precision

enable for

To VOUT

sense point

VIN

CBOOT

RBOOT

100 Ω

www.ti.com

TLVM13640

SLVSGJ7 – APRIL 2022

Copyright © 2022 Texas Instruments Incorporated

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