Datasheet LTC7852 (Analog Devices)
| 制造商 | Analog Devices |
| 描述 | Dual Output, 6-Phase, Multiphase Current Mode Synchronous Controller with Current Monitoring |
| 页数 / 页 | 32 / 1 — FEATURES. DESCRIPTION. Sub-Milliohm DCR Sensing or DrMOS with Current. … |
| 修订版 | A |
| 文件格式/大小 | PDF / 1.4 Mb |
| 文件语言 | 英语 |
FEATURES. DESCRIPTION. Sub-Milliohm DCR Sensing or DrMOS with Current. Sense Improves Efficiency
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LTC7852/LTC7852-1 Dual Output, 6-Phase, Multiphase Current Mode Synchronous Controller with Current Monitoring
FEATURES DESCRIPTION
n
Sub-Milliohm DCR Sensing or DrMOS with Current
The LTC®7852/LTC7852-1 is a six-phase, dual output
Sense Improves Efficiency
n current mode synchronous step-down switching regu-
Operates with Power Blocks, DrMOS or External
lator controller that works in conjunction with external
Gate Drivers and MOSFETs
n power train devices such as DrMOS, power blocks or
±0.5% Total Output Voltage Accuracy
discrete N-channel MOSFETs and associated gate drivers. n
Flexible Phase Configuration
Its flexible design enables 1-, 2-, 3-, 4-, 5-, and 6-phase n
Dual Output Current Monitoring
configurations. The LTC7852 offers a unique feature that n
tON(MIN) = 40ns, Capable of Very Low Duty Cycles at
enhances the signal-to-noise ratio of the current sense
High Frequency
signal, allowing the use of inductors with very low DC n Dual Differential Remote Sensing Amplifiers winding resistances for maximum efficiency. The controller n Programmable Frequency Range of 250kHz to 1.2MHz achieves a minimum on-time of just 40ns, permitting the n VIN Range Is Not Limited by IC use of high switching frequency at high step-down ratios. n VCC Range: 4.5V to 5.5V 8-, 10- or 12 phases with two ICs can be paralleled for n VOUT Range: 0.5V to 2.0V very high current requirements up to 400A. n 48 Lead (5mm × 6mm) GQFN for LTC7852 n 36 Lead (4mm × 5mm) QFN for LTC7852-1 The remote sense differential amplifiers and a precise reference provide accurate output voltages between 0.5V
APPLICATIONS
and 2.0V. The input voltage is not limited by the controller. n Hiccup mode protection from output shorts or overcurrent Computer Systems minimizes the thermal dissipation. n Telecom and Datacom Systems n DC Power Distribution Systems The LTC7852-1 is designed specifically for DrMOS with All registered trademarks and trademarks are the property of their respective owners. Protected an internal current sense signal. by U.S. patents, including 9525351, 9793800.
TYPICAL APPLICATION
VIN 5V TO 13V + VCC 4.5V TO 5.5V 4.7µF 2.2µF VCC VDD L1~4 L4~5 PGOOD1 V 0.25µH PGOOD2 0.25µH OUT1 VOUT2 0.9V DrMOS PWM1-4 PWM5-6 DrMOS 120A + 1.2V + 330µF 330µF 60A ×12 X6 LTC7852 SNSP1-4 SNSP5-6 715Ω 715Ω 220nF 220nF 220nF 220nF SNSAVG1-4 SNSAVG5-6 2.32k 2.32k 16k 28k SNSN1-4 SNSN5-6 VOSNS1+ VOSNS2+ 20k PINS NOT SHOWN VOSNS1– VOSNS2– 20k IN THIS CIRCUIT: 3.01k 3.01k IMON1 ITH1 ITH2 IMON2 3.3nF 150pF SS1 SS2 150pF 3.3nF V1P5 PLLIN 0.22µF 0.22µF ILIM1 FREQ GND PHCFG ILIM2 CLKOUT 78521 TA01a RUN1 RUN2 37.4k Rev A Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagrams Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
FEATURES DESCRIPTION
n
Sub-Milliohm DCR Sensing or DrMOS with Current
The LTC®7852/LTC7852-1 is a six-phase, dual output
Sense Improves Efficiency
n current mode synchronous step-down switching regu-
Operates with Power Blocks, DrMOS or External
lator controller that works in conjunction with external
Gate Drivers and MOSFETs
n power train devices such as DrMOS, power blocks or
±0.5% Total Output Voltage Accuracy
discrete N-channel MOSFETs and associated gate drivers. n
Flexible Phase Configuration
Its flexible design enables 1-, 2-, 3-, 4-, 5-, and 6-phase n
Dual Output Current Monitoring
configurations. The LTC7852 offers a unique feature that n
tON(MIN) = 40ns, Capable of Very Low Duty Cycles at
enhances the signal-to-noise ratio of the current sense
High Frequency
signal, allowing the use of inductors with very low DC n Dual Differential Remote Sensing Amplifiers winding resistances for maximum efficiency. The controller n Programmable Frequency Range of 250kHz to 1.2MHz achieves a minimum on-time of just 40ns, permitting the n VIN Range Is Not Limited by IC use of high switching frequency at high step-down ratios. n VCC Range: 4.5V to 5.5V 8-, 10- or 12 phases with two ICs can be paralleled for n VOUT Range: 0.5V to 2.0V very high current requirements up to 400A. n 48 Lead (5mm × 6mm) GQFN for LTC7852 n 36 Lead (4mm × 5mm) QFN for LTC7852-1 The remote sense differential amplifiers and a precise reference provide accurate output voltages between 0.5V
APPLICATIONS
and 2.0V. The input voltage is not limited by the controller. n Hiccup mode protection from output shorts or overcurrent Computer Systems minimizes the thermal dissipation. n Telecom and Datacom Systems n DC Power Distribution Systems The LTC7852-1 is designed specifically for DrMOS with All registered trademarks and trademarks are the property of their respective owners. Protected an internal current sense signal. by U.S. patents, including 9525351, 9793800.
TYPICAL APPLICATION
VIN 5V TO 13V + VCC 4.5V TO 5.5V 4.7µF 2.2µF VCC VDD L1~4 L4~5 PGOOD1 V 0.25µH PGOOD2 0.25µH OUT1 VOUT2 0.9V DrMOS PWM1-4 PWM5-6 DrMOS 120A + 1.2V + 330µF 330µF 60A ×12 X6 LTC7852 SNSP1-4 SNSP5-6 715Ω 715Ω 220nF 220nF 220nF 220nF SNSAVG1-4 SNSAVG5-6 2.32k 2.32k 16k 28k SNSN1-4 SNSN5-6 VOSNS1+ VOSNS2+ 20k PINS NOT SHOWN VOSNS1– VOSNS2– 20k IN THIS CIRCUIT: 3.01k 3.01k IMON1 ITH1 ITH2 IMON2 3.3nF 150pF SS1 SS2 150pF 3.3nF V1P5 PLLIN 0.22µF 0.22µF ILIM1 FREQ GND PHCFG ILIM2 CLKOUT 78521 TA01a RUN1 RUN2 37.4k Rev A Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagrams Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts