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FEATURES

- Silent Switcher?2 Architecture:

- Ultralow EMI on Any PCB

- Eliminates PCB Layout Sensitivity

- Internal Bypass Capacitors Reduce Radiated EMI

- Optional Spread Spectrum Modulation

- Exposed Die Package for Heat Sink Mount

- 6A DC from Each Channel Simultaneously

- Up to 8A on Either Channel

- Ultralow Quiescent Current Burst Mode? Operation:

- 6.2μA IQ Regulating 12VIN to 5VOUT1 and 3.3VOUT2

- Output Ripple <10mVP-P

- Optional External VC Pin: Fast Transient Response

and Current Sharing (Extra 50μA IQ/Channel)

- Forced Continuous Mode

- High Efficiency at High Frequency

- 94.6 Efficiency at 2A, 5VOUT from 12VIN at 2MHz

- 93.3 Efficiency at 4A, 5VOUT from 12VIN at 2MHz

- Fast Minimum Switch-On Time: 40ns

- Wide Input Voltage Range: 3.0V to 42V

- Adjustable and Synchronizable: 300kHz to 3MHz

- 4mm × 6mm 32-Lead LQFN Exposed Back Package

- AEC-Q100 Qualified for Automotive Applications

APPLICATIONS

- General Purpose Step-Down

- Automotive and Industrial Supplies

DESCRIPTION

The LT?8650SP is a dual step-down regulator that delivers

up to 6A of continuous current from both channels with a

heat sink and supports loads up to 8A from each channel.

The LT8650SP features second generation Silent Switcher

architecture to minimize EMI emissions while delivering

high efficiency at high switching frequencies. This includes

integration of bypass capacitors to optimize high frequency

current loops and make it easy to achieve advertised EMI

performance by eliminating layout sensitivity. The top of the

package features exposed die for heat sink attach which is

required to meet maximum output current ratings.

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 at high switching frequencies.

Burst Mode operation features a 6.2μA quiescent current

resulting in high efficiency at low output currents, forced

continuous mode allows fixed switching frequency operation

over the entire output load range, and spread spectrum

operation can further reduce EMI emissions. External VC

pins allow optimal loop compensation for fast transient

response. The VC pins can also be used for current sharing

and the CLKOUT pin enables synchronizing two LT8650SP

chips to generate a 4-phase, 24A supply.