TS3410

1A / 1.5MHz Synchronous Buck Converter

3/7

Version: A08

Block Diagram

Function Description

Operation

TS3410 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 1A

Current Mode PWM Control

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

load and line 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 peak inductor current is above the error

voltage. The current comparator, ICOMP, limits the peak inductor current. When the main switch is off, the

synchronous rectifier will be turned on immediately and stay on until either the inductor current starts to reverse, as

indicated by the current reversal comparator, IZERO, or the beginning of the next clock cycle. The OVDET comparator

controls output transient overshoots by turning the main switch off and keeping it off until the fault is no longer present.

Idle Mode Operation

At very light loads, TS3410 automatically enters pulse skipping Mode. In the pulse skipping Mode, the inductor current

may reach zero or reverse on each pulse. The PWM control loop will automatically skip pulses to maintain output

regulation. The bottom MOSFET is turned off by the current reversal comparator, IZERO, and the switch voltage will

ring. This is discontinuous mode operation, and is normal behavior for the switching regulator.