Datasheet LT8652S (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Dual Channel 8.5A, 18V, Synchronous Step-Down Silent Switcher with 16µA Quiescent Current |
| Pages / Page | 34 / 1 — FEATURES. DESCRIPTION. Silent Switcher. 2 Architecture:. Ultralow EMI on … |
| File Format / Size | PDF / 2.9 Mb |
| Document Language | English |
FEATURES. DESCRIPTION. Silent Switcher. 2 Architecture:. Ultralow EMI on Any PCB. Eliminates PCB Layout Sensitivity
Text Version of Document
LT8652S Dual Channel 8.5A, 18V, Synchronous Step-Down Silent Switcher with 16µA Quiescent Current
FEATURES DESCRIPTION
n
Silent Switcher
®
2 Architecture:
The LT®8652S is a dual step-down regulator that deliv- n
Ultralow EMI on Any PCB
ers up to 8.5A of continuous current from both channels n
Eliminates PCB Layout Sensitivity
and supports loads up to 12A from each channel. The n
Internal Bypass Capacitors Reduce Radiated EMI
LT8652S uses second generation Silent Switcher technol- n
Spread Spectrum Frequency Modulation
ogy including integrated bypass capacitors to deliver a n
8.5A DC from Each Channel Simultaneously
high frequency, high efficiency, small solution with excel- n
Up to 12A on Either Channel
lent EMI performance. The LT8652S is ideal for noise n
Ultralow Quiescent Current Burst Mode
®
Operation:
sensitive applications such as PLLs and high bandwidth n
16µA IQ Regulating 12VIN to 3.3VOUT (Both Channels)
data and communications systems. n
Output Ripple <10mVP-P
The fast, clean, low overshoot switching edges enable n
±1.2% 600mV Feedback Voltage with Remote Sense
n high efficiency operation even at high switching frequen-
Output Current Monitor Pins with Current Limiting
n cies, enabling a wide control loop bandwidth for fast tran- Forced Continuous Mode n sient response. Output current monitoring and limiting CLKOUT for Up to 4-Phase Operation n allows inductors to be selected for the maximum output 93.6% Efficiency at 6A, 3.3VOUT from 12VIN at 1MHz n current in a given application. Differential output voltage 85.6% Efficiency at 6A, 1.0VOUT from 12VIN at 1MHz n sensing provides accurate voltage regulation at the point Fast Minimum Switch-On Time: 20ns n of load for high current applications. The two channels Adjustable and Synchronizable: 300kHz to 3MHz n can be combined to deliver 17A, and two LT8652S ICs Small 4mm × 7mm 36-Pin LQFN Package n can be combined for a 4-phase, 34A supply. AEC-Q100 Qualification for Automotive Applications in Progess All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. Patents, including 8823345.
APPLICATIONS
n Server Power Applications n General Purpose Step-Down
TYPICAL APPLICATION 3.3V/8.5A, 1.0V/8.5A 1.5MHz Step-Down Converter Efficiency
100 VIN1 V V V IN2 IN1 = VIN2 = 12V IN1 VIN2 3.6V TO 18V 3.0V TO 18V 95 f 10µF SW = 1.5MHz EN 10µF 90 BIAS 85 VOUT1 1µH 0.3µH VOUT2 80 3.3V SW1 SW2 1.0V 8.5A 8.5A 75 10pF 70 1M 665k 10pF 330µF 220µF 65 FB1 LT8652S FB2 1210 1210 EFFICIENCY (%) X5R 60 X5R 221k 1M 55 SNSGND1 SNSGND2 50 SS1 SS2 CH1 3.3V 10nF 10nF 45 CH2 1V 40 IMON1 IMON2 0 2 4 6 8 10 12 RT V LOAD CURRENT (A) CC GND SYNC 8652S TA01b 5.11k 27.4k 5.11k 1µF 8652S TA01a fSW = 1.5MHz Rev. 0 Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
FEATURES DESCRIPTION
n
Silent Switcher
®
2 Architecture:
The LT®8652S is a dual step-down regulator that deliv- n
Ultralow EMI on Any PCB
ers up to 8.5A of continuous current from both channels n
Eliminates PCB Layout Sensitivity
and supports loads up to 12A from each channel. The n
Internal Bypass Capacitors Reduce Radiated EMI
LT8652S uses second generation Silent Switcher technol- n
Spread Spectrum Frequency Modulation
ogy including integrated bypass capacitors to deliver a n
8.5A DC from Each Channel Simultaneously
high frequency, high efficiency, small solution with excel- n
Up to 12A on Either Channel
lent EMI performance. The LT8652S is ideal for noise n
Ultralow Quiescent Current Burst Mode
®
Operation:
sensitive applications such as PLLs and high bandwidth n
16µA IQ Regulating 12VIN to 3.3VOUT (Both Channels)
data and communications systems. n
Output Ripple <10mVP-P
The fast, clean, low overshoot switching edges enable n
±1.2% 600mV Feedback Voltage with Remote Sense
n high efficiency operation even at high switching frequen-
Output Current Monitor Pins with Current Limiting
n cies, enabling a wide control loop bandwidth for fast tran- Forced Continuous Mode n sient response. Output current monitoring and limiting CLKOUT for Up to 4-Phase Operation n allows inductors to be selected for the maximum output 93.6% Efficiency at 6A, 3.3VOUT from 12VIN at 1MHz n current in a given application. Differential output voltage 85.6% Efficiency at 6A, 1.0VOUT from 12VIN at 1MHz n sensing provides accurate voltage regulation at the point Fast Minimum Switch-On Time: 20ns n of load for high current applications. The two channels Adjustable and Synchronizable: 300kHz to 3MHz n can be combined to deliver 17A, and two LT8652S ICs Small 4mm × 7mm 36-Pin LQFN Package n can be combined for a 4-phase, 34A supply. AEC-Q100 Qualification for Automotive Applications in Progess All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. Patents, including 8823345.
APPLICATIONS
n Server Power Applications n General Purpose Step-Down
TYPICAL APPLICATION 3.3V/8.5A, 1.0V/8.5A 1.5MHz Step-Down Converter Efficiency
100 VIN1 V V V IN2 IN1 = VIN2 = 12V IN1 VIN2 3.6V TO 18V 3.0V TO 18V 95 f 10µF SW = 1.5MHz EN 10µF 90 BIAS 85 VOUT1 1µH 0.3µH VOUT2 80 3.3V SW1 SW2 1.0V 8.5A 8.5A 75 10pF 70 1M 665k 10pF 330µF 220µF 65 FB1 LT8652S FB2 1210 1210 EFFICIENCY (%) X5R 60 X5R 221k 1M 55 SNSGND1 SNSGND2 50 SS1 SS2 CH1 3.3V 10nF 10nF 45 CH2 1V 40 IMON1 IMON2 0 2 4 6 8 10 12 RT V LOAD CURRENT (A) CC GND SYNC 8652S TA01b 5.11k 27.4k 5.11k 1µF 8652S TA01a fSW = 1.5MHz Rev. 0 Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
