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.