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

LT8645S屬于集成電路（IC） > 穩(wěn)壓器 - DC-DC 開(kāi)關(guān)穩(wěn)壓器。亞德諾半導(dǎo)體技術(shù)有限公司制造生產(chǎn)的LT8645S穩(wěn)壓器 - DC-DC 開(kāi)關(guān)穩(wěn)壓器DC-DC 開(kāi)關(guān)穩(wěn)壓器 PMIC（電源管理集成電路）產(chǎn)品族中的產(chǎn)品是元器件級(jí)設(shè)備，用于需要穩(wěn)定 DC 輸入電壓和/或?qū)⑵滢D(zhuǎn)換為不同幅度的輸出電壓的應(yīng)用。這些器件與稱為“控制器”PMIC 的類似產(chǎn)品的區(qū)別在于集成了主開(kāi)關(guān)元件，設(shè)備提供的電力會(huì)通過(guò)該元件。