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Analog Devices LT8636 | Demoboard AD-GMSLCAMRPI-ADP
42V, 5A/7A Peak Synchronous Step-Down Silent Switcher with 2.5µA Quiescent Current
Overview
| Topology | Other Topology |
| Input voltage | 3.4-42 V |
| Switching frequency | 300-3000 kHz |
| Output 1 | 5 V / 5 A |
Description
The LT®8636/LT8637 synchronous step-down regulator features Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at high switching frequencies. Peak current mode control with a 30ns minimum on-time allows high step-down ratios even at high switching frequencies.The LT8636’s ultralow 2.5µA quiescent current—with the output in full regulation—enables applications requiring highest efficiency at very small load currents. The LT8637has external compensation to enable current sharing and fast transient response at high switching frequencies. A CLKOUT pin enables synchronizing other regulators to the LT8636/LT8637.
Features
- 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 95% Efficiency at 2MHz, 12VIN to 5VOUT
- Wide Input Voltage Range: 3.4V to 42V
- 5A Maximum Continuous, 7A Peak Transient Output
- Ultralow Quiescent Current Burst Mode® Operation
- 2.5µA IQ Regulating 12VIN to 3.3VOUT (LT8636)
- Output Ripple < 10mVP-P
- External Compensation: Fast Transient Response and Current Sharing (LT8637)
- 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 Power Good
- Small 20-Lead 4mm × 3mm LQFN Package
- AEC-Q100 Qualified for Automotive Applications
Typical applications
- General Purpose Step-Down
- Automotive and Industrial Supplies
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC(mΩ) | fres(MHz) | Material | Pins | Pitch(mm) | Type | L(mm) | H(mm) | IR(A) | Working Voltage(V (AC)) | Packaging | Contact Resistance(mΩ) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-HCI SMT Flat Wire High Current Inductor, 0.76 µH, 22.9 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-HCI SMT Flat Wire High Current Inductor | Inductance0.76 µH | Performance Rated Current22.9 A | Saturation Current @ 10%8 A | Saturation Current @ 30%15 A | DC Resistance2.25 mΩ | Self Resonant Frequency200 MHz | MaterialSuperflux | Pins2 | – | – | Length7 mm | Height4.8 mm | – | – | – | – | ||||
 | WR-FPC Zero Insertion Force Connectors - 0.50mm, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-FPC Zero Insertion Force Connectors - 0.50mm | – | – | – | – | – | – | – | Pins22 | Pitch0.5 mm | TypeHorizontal | Length15.1 mm | – | Rated Current0.5 A | Working Voltage50 V (AC) | PackagingTape and Reel | Contact Resistance50 mΩ |