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Analog Devices LT8652S | Demoboard DC2523A
Dual Channel 8.5A, 18V, Synchronous Step-Down Silent Switcher with 16µA Quiescent Current
Overview
| Topology | Buck Converter |
| Input voltage | 3.6-18 V |
| Switching frequency | 1850-2150 kHz |
| Output 1 | 1.25 V / 12 A |
| Output 2 | 3.43 V / 12 A |
Description
The LT®8652S is a dual step-down regulator that delivers up to 8.5A of continuous current from both channels and supports loads up to 12A from each channel. The LT8652S uses second generation Silent Switcher technology including integrated bypass capacitors to deliver a high frequency, high efficiency, small solution with excellent EMI performance. The LT8652S is ideal for noise sensitive applications such as PLLs and high bandwidth data and communications systems. The fast, clean, low overshoot switching edges enable high efficiency operation even at high switching frequencies, enabling a wide control loop bandwidth for fast transient response. Output current monitoring and limiting allows inductors to be selected for the maximum output current in a given application. Differential output voltage sensing provides accurate voltage regulation at the point of load for high current applications. The two channels can be combined to deliver 17A, and two LT8652S ICs can be combined for a 4-phase, 34A supply.
Features
- Silent Switcher®2 Architecture:
- Ultralow EMI on Any PCB
- Eliminates PCB Layout Sensitivity
- Internal Bypass Capacitors Reduce Radiated EMI
- Spread Spectrum Frequency Modulation
- 8.5A DC from Each Channel Simultaneously
- Up to 12A on Either Channel
- Ultralow Quiescent Current Burst Mode® Operation:
- 16µA IQ Regulating 12VIN to 3.3VOUT (Both Channels)
- Output Ripple <10mVP-P
- ±1.2% 600mV Feedback Voltage with Remote Sense
- Output Current Monitor Pins with Current Limiting
- Forced Continuous Mode
- CLKOUT for Up to 4-Phase Operation
- 93.6% Efficiency at 6A, 3.3VOUT from 12VIN at 1MHz
- 85.6% Efficiency at 6A, 1.0VOUT from 12VIN at 1MHz
- Fast Minimum Switch-On Time: 20ns
- Adjustable and Synchronizable: 300kHz to 3MHz
- Small 4mm × 7mm 36-Pin LQFN Package
- AEC-Q100 Qualification for Automotive Applications in Progess
Typical applications
- 1
- Server Power Applications / General Purpose Step-Down
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | f(mm) | L(µH) | IRP,40K(A) | ISAT,10%(A) | ISAT,30%(A) | RDC max.(mΩ) | fres(MHz) | Z @ 100 MHz(Ω) | Zmax(Ω) | Test Condition Zmax | IR(mA) | Z @ 1 GHz(Ω) | H(mm) | Type | Pins | Mount | L(mm) | Working Voltage(V (AC)) | Operating Temperature | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-MPSB EMI Multilayer Power Suppression Bead, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-MPSB EMI Multilayer Power Suppression Bead | – | – | – | – | – | DC Resistance6 mΩ | – | Impedance @ 100 MHz100 Ω | Maximum Impedance160 Ω | Maximum Impedance1100 MHz | Rated Current8000 mA | Impedance @ 1 GHz150 Ω | Height2.3 mm | TypeHigh Current | – | MountSMT | Length4.5 mm | – | Operating Temperature -55 °C up to +125 °C | ||||
 | WE-LHMI SMT Power Inductor, –, 0.33 µH | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-LHMI SMT Power Inductor | – | Inductance0.33 µH | Performance Rated Current15.1 A | Saturation Current @ 10%15 A | Saturation Current @ 30%29.3 A | DC Resistance5 mΩ | Self Resonant Frequency120 MHz | – | – | – | – | – | Height2.8 mm | – | Pins2 | MountSMT | Length5.7 mm | – | Operating Temperature -40 °C up to +125 °C | ||||
 | WA-SNSR Self-Retaining Spacer, 4.8 mm, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWA-SNSR Self-Retaining Spacer | Drilling in Panel4.8 mm | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | Length11.1 mm | – | Operating Temperature -30 °C up to +85 °C | |||
 | WR-PHD Jumper, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Jumper | – | – | – | – | – | – | – | – | – | – | Rated Current3000 mA | – | – | – | Pins2 | – | – | Working Voltage200 V (AC) | Operating Temperature -25 °C up to +105 °C | |||
 | WR-PHD Pin Header, –, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header | – | – | – | – | – | – | – | – | – | – | Rated Current2000 mA | – | – | TypeStraight | Pins3 | MountTHT | Length6 mm | Working Voltage200 V (AC) | Operating Temperature -40 °C up to +105 °C | |||
 | WR-PHD Pin Header, –, – | Simulation– | Downloads7 files | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWR-PHD Pin Header | – | – | – | – | – | – | – | – | – | – | Rated Current2000 mA | – | – | TypeStraight | Pins8 | MountTHT | Length8 mm | Working Voltage200 V (AC) | Operating Temperature -40 °C up to +105 °C |