DESCRIPTION

The LT®8645S/LT8646S synchronous step-down regulator

features second generation Silent Switcher architecture

designed to minimize EMI emissions while delivering high

efficiency at high switching frequencies. This includes the

integration of bypass capacitors to optimize all the fast

current loops inside and make it easy to achieve advertised

EMI performance by eliminating layout sensitivity.

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. The

LT8646S has external compensation to enable current

sharing and fast transient response 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®2 Architecture

- Ultralow EMI Emissions on Any PCB

- Eliminates PCB Layout Sensitivity

- Internal Bypass Capacitors Reduce Radiated EMI

- 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 (LT8645S)

- Output Ripple < 10mVP-P

- External Compensation: Fast Transient Response

and Current Sharing (LT8646S)

- 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

LT8612属于集成电路（IC） > 稳压器 - DC-DC 开关稳压器。亚德诺半导体技术有限公司制造生产的LT8612稳压器 - DC-DC 开关稳压器DC-DC 开关稳压器 PMIC（电源管理集成电路）产品族中的产品是元器件级设备，用于需要稳定 DC 输入电压和/或将其转换为不同幅度的输出电压的应用。这些器件与称为“控制器”PMIC 的类似产品的区别在于集成了主开关元件，设备提供的电力会通过该元件。