The TS3404 is a PWM buck controller chip that has a PWM control circuit, 1.25V reference output, error amplifier, adjustable oscillator, soft start, under voltage lockout (UVLO), short circuit protection (SCP) circuit, and support DIP-8 and SOP-8 package.
The TS3405 is designed to implement complete control and protection schemes for DC-DC step-down converters. It integrates control, output adjustment, monitoring, and protection functions while driving N-channel MOSFETs in a synchronous buck topology.
Key features include voltage-mode PWM control with fast transient response, an internal 0.8V reference, and lossless programmable over-current protection by monitoring the lower MOSFET's Rds(on). The device operates with a fixed oscillator frequency up to 300KHz.
| Oscillator Frequency | 250 to 340 KHz (Typ 300KHz) |
|---|---|
| Gain-bandwidth product | 14 MHz (Typ) |
| Slew Rate | 4.65 to 9.2 V/uS |
| OCP Threshold | -300 mV |
| Operating Junction Temperature Range | -40 to +125 °C |
The fixed oscillator frequency can reach up to 300KHz.
The entire soft start process typically takes about 5mS.