LT8643SIV#PBF
Power Management
Technical Specifications
| Type | Description |
|---|---|
| Output Type | Adjustable |
| Output Current | 6 A |
| Function | Step-down type |
| Switching Freq Hz | 3 MHz |
| Channels | 1 |
| Quiescent Current | 2.5 µA |
| Switch Tube (built-in/external) | Built-in |
| Type | Description |
|---|---|
| Operating Temperature | -40°C~+125°C@(TJ) |
| Features | EMI optimization (spread spectrum);External compensation;Light load efficient mode;Frequency synchronization;Output voltage tracking |
| Topology | Buck |
| Supply Voltage | 3.4V~42V |
| Output Voltage | - |
| Package / Case | LQFN-24-EP(4x4) |
Product Introduction
The LT8640S/LT8643S synchronous step-down regulator features second generation Silent Switcher architecture designed to minimize EMI/EMC 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 reducing layout sensitivity. This performance makes the LT8640S/LT8643S ideal for noise- sensitive applications and environments.
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 30ns minimum on-time allows high step-down ratios even at high switching frequencies. The LT8643S has external compensation via the V₀ pin to enable current sharing and fast transient response at high switching frequencies. A CLKOUT pin enables synchronizing other regulators to the LT8640S/LT8643S.
Burst Mode operation enables ultralow standby current consumption, forced continuous mode can control frequency harmonics across the entire output load range, or spread spectrum operation can further reduce EMI/ EMC emissions. Soft-start and tracking functionality is accessed via the TR/SS pin, and an accurate input voltage UVLO threshold can be set using the EN/UV pin.
Features
- Silent Switcher Architecture Ultralow EMI/EMC 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 96% Efficiency at 1MHz, 12VIN to 5VOUT Up to 95% Efficiency at 2MHz, 12VIN to 5VOUT
- Wide Input Voltage Range: 3.4V to 42V
- 6A Maximum Continuous, 7A Peak Output
- Ultralow Quiescent Current Burst Mode Operation in 2.5µA Regulating 12VIN to 3.3VOUT (LT8640S) Output Ripple < 10mVP-P
- External Compensation: Fast Transient Response and Current Sharing (LT8643S)
- Fast Minimum Switch On-Time: 30ns
- Low Dropout Under All Conditions: 100mV at 1A
- Forced Continuous Mode
- Adjustable and Synchronizable: 200kHz to 3MHz
- Output Soft-Start and Tracking
- Small 24-Lead 4mm × 4mm LQFN Package
Applications
- Automotive and Industrial Supplies
- General Purpose Step-Down
Datasheet
Compliance & Export Codes
| Type | Details |
|---|---|
| RoHS | ROHS3 |
| ECCN | EAR99 |
| CNHTS | 8542399000 |
| USHTS | 8542390001 |
| TARIC | 8542399000 |
| Type | Details |
|---|---|
| CAHTS | 8542390000 |
| BRHTS | 85423999 |
| INHTS | 85423900 |
| MXHTS | 8542.39.99 |
Sourcing Information
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