TS3420

2A, 1.25MHz Synchronous Buck Converter

3/9

Version: A12

Block Diagram

FB

EN

VIN

SW

GND

Over-Temperature and

Short-Circuit Protection

REF

Soft-Star

0.6V

+

-

-

+

Icomp

Isense

AMP

OSC

SLOPE

COMP

PWM

LOGIC

Izero

COMP

NON-OVERLAP

CONTROL

RESET

SET

Enable Logic

Function Description

Operation

TS3420 is a monolithic switching mode step-down DC-DC converter. It utilizes internal MOSFETs to achieve high

efficiency and can generate very low output voltage by using internal reference at 0.6V. It operates at a fixed

switching frequency, and uses the slope compensated current mode architecture. This step-down DC-DC

Converter supplies minimum 2A output current at input voltage range from 2.8V to 5.5V.

Current Mode PWM Control

Slope compensated current mode PWM control provides stable switching and cycle-by-cycle current limit for

excellent load and line transient responses and protection of the internal main switch (P-Ch MOSFET) and

synchronous rectifier (N-CH MOSFET). During normal operation, the internal P-Ch MOSFET is turned on for a

certain time to ramp the inductor current at each rising edge of the internal oscillator, and switched off when the

When the main switch is off, the synchronous rectifier will be turned on immediately and stay on until either the

next clock cycle.