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说明
- Silent Switcher® Architecture
- Ultralow EMI Emissions
- Optional Spread Spectrum Modulation
- High Efficiency at High Frequency
- Up to 96% Efficiency at 1MHz, 12VIN to 5VOUT
- Up to 94% Efficiency at 2MHz, 12VIN to 5VOUT
- Wide Input Voltage Range: 2.8V to 42V
- 10A Maximum Continuous, 12A Peak Transient Output
- Fast Transient Response with External Compensation
- Low Quiescent Current Burst Mode® Operation
- 90μA IQ Regulating 12VIN to 5VOUT
- Output Ripple < 10mVP-P
- Reference Accuracy: ±1% Over Temperature
- Fast Minimum Switch On-Time: 25ns
- PolyPhase® Operation: Up to 12 Phases
- Low Dropout Under All Conditions: 45mV at 1A
- Adjustable and Synchronizable: 200kHz to 3MHz
- Output Soft-Start and Power Good
- Safely Tolerates High Reverse Current
- 28-Lead 5mm × 4mm LQFN Package
- AEC-Q100 Qualified for Automotive Applications
特性
The LT®8638-2 synchronous step-down regulatorfeatures the Silent Switcher® architecture designed tominimize EMI emissions while delivering high efficiencyat high switching frequencies. This performance makesthe LT8638-2 ideal for noise sensitive applications andenvironments.
The fast, clean, low overshoot switching edges enablehigh efficiency operation even at high switchingfrequencies, leading to a small overall solution size.Peak current mode control with a 25ns minimum ontimeallows high step down ratios even at high switchingfrequencies. External compensation through the VC pinallows for fast transient response. PolyPhase operationallows multiple LT8638-2 regulators to run withinterleaving phase shift to provide more output current.
Burst Mode operation enables low standby currentconsumption, forced continuous mode can controlfrequency harmonics across the entire output loadrange, or spread spectrum operation can further reduceEMI emissions. Soft-start and tracking functionality isaccessed through the SS pin, and an accurate inputvoltage UVLO threshold can be set using the EN/UV pin.
- Automotive and Industrial Supplies
- General Purpose Step-Down
APPLICATIONS
