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Analog Devices LT8650S | Demoboard DC2407A
Dual Channel 42V, 4A Synchronous Step-Down Silent Switcher with 6.2μA Quiescent Current
Overview
| Topology | Buck Converter |
| Input voltage | 5.4-42 V |
| Switching frequency | 1850-2150 kHz |
| Output 1 | 5.2 V / 4 A |
| Output 2 | 3.43 V / 4 A |
| IC revision | 1 |
Description
The LT8650S is a dual step-down regulator that delivers up to 4A of continuous current from both channels and supports loads up to 6A from each channel. The LT8650S features the 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 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 LT8650S chips to generate a 4-phase, 16A supply.
Features
Silent Switcher®2 Architecture:
- Ultralow EMI on Any PCB
- Eliminates PCB Layout Sensitivity
- Internal Bypass Capacitors Reduce Radiated EMI
- Optional Spread Spectrum Modulation
- 4A DC from Each Channel Simultaneously
- Up to 6A on Either Channel
- Ultralow Quiescent Current Burst Mode® Operation:
- 6.2μA IQ Regulating 12VIN to 5VOUT1 and 3.3VOUT2
- Output Ripple <10mVP-P
- Forced Continuous Mode
- Optional External VC Pin: Fast Transient Response and Current Sharing (Extra 50µA IQ/Channel)
- 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
- Small 4mm × 6mm 32-Pin LQFN Package
- AEC-Q100 Qualified for Automotive Applications
Typical applications
- Automotive and Industrial Supplies
- General Purpose Step-Down
More information
Products
| Order Code | Datasheet | Simulation | Downloads | Product series | L (mm) | f (mm) | L (µH) | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC max. (mΩ) | fres (MHz) | Mount | Z @ 100 MHz (Ω) | Zmax (Ω) | Test Condition Zmax | IR (mA) | Z @ 1 GHz (Ω) | H (mm) | Type | Pins (pcs) | Rows | Gender | Packaging | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 744373240022 | SPEC | 8 files | WE-LHMI SMT Power Inductor | 4.45 | – | 0.22 | 11.4 | 10.8 | 22.3 | 7.3 | 195 | SMT | – | – | – | – | – | 1.8 | – | 2 | – | – | – | ||
 | 74279226101 | SPEC | 8 files | WE-MPSB EMI Multilayer Power Suppression Bead | 4.5 | – | – | – | – | – | 6 | – | SMT | 100 | 160 | 1100 MHz | 8000 | 150 | 2.3 | High Current | – | – | – | – | ||
 | 62000311121 | SPEC | – | 6 files | WR-PHD 2.00 mm THT Pin Header | 6 | – | – | – | – | – | – | – | THT | – | – | – | 2000 | – | – | Straight | 3 | Single | Pin Header | Bag | |
 | 62000621121 | SPEC | – | 6 files | WR-PHD 2.00 mm THT Dual Pin Header | 6 | – | – | – | – | – | – | – | THT | – | – | – | 2000 | – | – | Straight | 6 | Dual | Pin Header | Bag | |
 | 702934000 | SPEC | – | 3 files | WA-SNSR Self-Retaining Spacer | 11.1 | 4.8 | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | |
 | 60800213421 | SPEC | – | 3 files | WR-PHD 2.00 mm Jumper with Test Point | – | – | – | – | – | – | – | – | – | – | – | – | 3000 | – | – | – | 2 | – | Jumper | Bag |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 744373240022 | SPEC | |
| 74279226101 | SPEC | |
| 62000311121 | SPEC | – |
| 62000621121 | SPEC | – |
| 702934000 | SPEC | – |
| 60800213421 | SPEC | – |
| Samples |
|---|
| Order Code | Datasheet | Simulation | Downloads | Product series | L (mm) | f (mm) | L (µH) | IRP,40K (A) | ISAT,10% (A) | ISAT,30% (A) | RDC max. (mΩ) | fres (MHz) | Mount | Z @ 100 MHz (Ω) | Zmax (Ω) | Test Condition Zmax | IR (mA) | Z @ 1 GHz (Ω) | H (mm) | Type | Pins (pcs) | Rows | Gender | Packaging | Samples |
|---|