LTC7851EUHH#PBF

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Analog Devices Inc./Maxim Integrated

QUAD OUTPUT, MULTIPHASE STEP-DOWN VOLTAGE MODE DC/DC CONTROLLER WITH ACCURATE CURRENT SHARING

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LTC7851EUHH#PBF

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Analog Devices Inc./Maxim Integrated

QUAD OUTPUT, MULTIPHASE STEP-DOWN VOLTAGE MODE DC/DC CONTROLLER WITH ACCURATE CURRENT SHARING

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Description Specifications Series Pricing CAD Documents

Description

General part information

LTC7851 Series

The LTC7851/LTC7851-1 are quad output multiphase synchronous step-down switching regulator controllers that employ a constant frequency voltage mode architecture. They maintain excellent current balance between channels when paralleled with their internal current sharing loop. Lossless DCR or a low value RSENSEis used for output current sensing. Multiple LTC7851/LTC7851-1 devices can be used for high phase count operation.A very low offset, high bandwidth error amplifier, combined with remote output voltage sensing, provides excellent transient response and output regulation. The LTC7851/ LTC7851-1 operates with a VCCsupply voltage from 3V to 5.5V and is designed for step-down conversion with VINfrom 3V to 27V and produces an output voltage from 0.6V to VCC– 0.5V.The LTC7851-1 is identical to the LTC7851 except it has a lower current sense amplifier gain, making it ideal for DrMOS devices with internal current sense.ApplicationsHigh Current Distributed Power SystemsDSP, FPGA and ASIC SuppliesDatacom, Telecom and Computing Systems

Technical Specifications

Parameters and characteristics for this part

Specification	LTC7851EUHH#PBF

Clock Sync	No
Control Features	Power Good, Soft Start, Frequency Control, Current Limit, Enable, Tracking
Duty Cycle (Max)	91.5 %
Frequency - Switching (Max)	3 MHz
Frequency - Switching (Min)	250 kHz
Function	Step-Down
Mounting Type	Surface Mount
Number of Outputs	4
Operating Temperature (Max)	125 °C
Operating Temperature (Min)	-40 °C
Output Configuration	Positive
Output Phases	1
Output Type	PWM Signal
Package / Case	58-WFQFN Exposed Pad
Package Length	5 mm
Package Name	58-QFN
Package Width	9 mm
Synchronous Rectifier	No
Topology	Buck
Voltage - Supply (Vcc/Vdd) Maximum	5.5 V
Voltage - Supply (Vcc/Vdd) Minimum	3 V

LTC7851 Series

Quad Output, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing

Part	Duty Cycle (Max)	Output Type	Synchronous Rectifier	Package / Case	Frequency - Switching (Max)	Frequency - Switching (Min)	Voltage - Supply (Vcc/Vdd) Minimum	Voltage - Supply (Vcc/Vdd) Maximum	Operating Temperature (Max)	Operating Temperature (Min)	Output Phases	Control Features	Topology	Output Configuration	Mounting Type	Number of Outputs	Function	Package Name	Package Width	Package Length	Clock Sync
Analog Devices Inc./Maxim Integrated LTC7851IUHH-1	91.5 %	PWM Signal	No	58-WFQFN Exposed Pad	3 MHz	250 kHz	3 V	5.5 V	125 °C	-40 °C	1	Current Limit Enable Frequency Control Power Good Soft Start Tracking	Buck	Positive	Surface Mount	4	Step-Down	58-QFN	9 mm	5 mm	No
Analog Devices Inc./Maxim Integrated LTC7851IUHH#TRPBF	91.5 %	PWM Signal	No	58-WFQFN Exposed Pad	3 MHz	250 kHz	3 V	5.5 V	125 °C	-40 °C	1	Current Limit Enable Frequency Control Power Good Soft Start Tracking	Buck	Positive	Surface Mount	4	Step-Down	58-QFN	9 mm	5 mm	No
Analog Devices Inc./Maxim Integrated LTC7851EUHH#TRPBF	91.5 %	PWM Signal	No	58-WFQFN Exposed Pad	3 MHz	250 kHz	3 V	5.5 V	125 °C	-40 °C	1	Current Limit Enable Frequency Control Power Good Soft Start Tracking	Buck	Positive	Surface Mount	4	Step-Down	58-QFN	9 mm	5 mm	No
Analog Devices Inc./Maxim Integrated LTC7851IUHH-1#PBF	91.5 %	PWM Signal	No	58-WFQFN Exposed Pad	3 MHz	250 kHz	3 V	5.5 V	125 °C	-40 °C	1	Current Limit Enable Frequency Control Power Good Soft Start Tracking	Buck	Positive	Surface Mount	4	Step-Down	58-QFN	9 mm	5 mm	No
Analog Devices Inc./Maxim Integrated LTC7851EUHH-1#PBF	91.5 %	PWM Signal	No	58-WFQFN Exposed Pad	3 MHz	250 kHz	3 V	5.5 V	125 °C	-40 °C	1	Current Limit Enable Frequency Control Power Good Soft Start Tracking	Buck	Positive	Surface Mount	4	Step-Down	58-QFN	9 mm	5 mm	No
Analog Devices Inc./Maxim Integrated LTC7851IUHH-1#TRPBF	91.5 %	PWM Signal	No	58-WFQFN Exposed Pad	3 MHz	250 kHz	3 V	5.5 V	125 °C	-40 °C	1	Current Limit Enable Frequency Control Power Good Soft Start Tracking	Buck	Positive	Surface Mount	4	Step-Down	58-QFN	9 mm	5 mm	No
Analog Devices Inc./Maxim Integrated LTC7851EUHH-1#TRPBF	91.5 %	PWM Signal	No	58-WFQFN Exposed Pad	3 MHz	250 kHz	3 V	5.5 V	125 °C	-40 °C	1	Current Limit Enable Frequency Control Power Good Soft Start Tracking	Buck	Positive	Surface Mount	4	Step-Down	58-QFN	9 mm	5 mm	No
Analog Devices Inc./Maxim Integrated LTC7851EUHH#PBF	91.5 %	PWM Signal	No	58-WFQFN Exposed Pad	3 MHz	250 kHz	3 V	5.5 V	125 °C	-40 °C	1	Current Limit Enable Frequency Control Power Good Soft Start Tracking	Buck	Positive	Surface Mount	4	Step-Down	58-QFN	9 mm	5 mm	No
Analog Devices Inc./Maxim Integrated LTC7851IUHH#PBF	91.5 %	PWM Signal	No	58-WFQFN Exposed Pad	3 MHz	250 kHz	3 V	5.5 V	125 °C	-40 °C	1	Current Limit Enable Frequency Control Power Good Soft Start Tracking	Buck	Positive	Surface Mount	4	Step-Down	58-QFN	9 mm	5 mm	No

Pricing

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CAD

3D models and CAD resources for this part

Documents

Technical documentation and resources

LTC7851: Quad Output, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing Data Sheet (Rev.A)