DESCRIPTION

The LT®8645S-2 synchronous step-down regulator features

Silent Switcher architecture designed to minimize

EMI emissions while delivering high efficiency at high

switching frequencies. This performance makes the

LT8645S-2 ideal for noise sensitive applications and

environments.

The fast, clean, low-overshoot switching edges enable

high efficiency operation even at high switching frequencies,

leading to a small overall solution size. Peak current

mode control with a 40ns minimum on-time allows high

step-down ratios even at high switching frequencies.

Burst Mode® operation enables ultralow standby current

consumption, pulse-skipping mode allows full switching

frequency at lower output loads, or spread spectrum

operation can further reduce EMI emissions.

FEATURES

- Silent Switcher® Architecture

- Ultralow EMI Emissions

- Optional Spread Spectrum Modulation

- High Efficiency at High Frequency

- Up to 95 Efficiency at 1MHz, 12VIN to 5VOUT

- Up to 94 Efficiency at 2MHz, 12VIN to 5VOUT

- Wide Input Voltage Range: 3.4V to 65V

- Ultralow Quiescent Current Burst Mode Operation

- 2.5μA IQ Regulating 12VIN to 3.3VOUT

- Output Ripple < 10mVP-P

- Fast Minimum Switch On-Time: 40ns

- Low Dropout Under All Conditions: 60mV at 1A

- Adjustable and Synchronizable: 200kHz to 2.2MHz

- Peak Current Mode Operation

- Output Soft-Start and Tracking

- Small 32-Lead 6mm × 4mm LQFN Package

- AEC-Q100 Qualified for Automotive Applications

APPLICATIONS

- Automotive and Industrial Supplies

- General Purpose Step-Down

- GSM Power Supplies