LTC7840 Series

2-Phase Dual Output Non-Synchronous Boost Controller with Hiccup Mode

Catalog

2-Phase Dual Output Non-Synchronous Boost Controller with Hiccup Mode

Part	Topology	Mounting Type	Supplier Device Package	Duty Cycle (Max) [Max]	Control Features	Frequency - Switching [Min]	Frequency - Switching [Max]	Function	Output Phases	Output Configuration	Package / Case	Operating Temperature [Min]	Operating Temperature [Max]	Number of Outputs	Package / Case [custom]	Package / Case [x]
Analog Devices LTC7840IUFD#PBF	Boost	Surface Mount	28-QFN (4x5)	96 %	Current Limit Enable Frequency Control Power Good	50 kHz	425 kHz	Step-Up	2	Positive	28-WFQFN Exposed Pad	-40 °C	125 ¯C	2
Analog Devices LTC7840HUFD#TRPBF	Boost	Surface Mount	28-QFN (4x5)	96 %	Current Limit Enable Frequency Control Power Good	50 kHz	425 kHz	Step-Up	2	Positive	28-WFQFN Exposed Pad	-40 °C	150 °C	2
Analog Devices LTC7840HUFD#PBF	Boost	Surface Mount	28-QFN (4x5)	96 %	Current Limit Enable Frequency Control Power Good	50 kHz	425 kHz	Step-Up	2	Positive	28-WFQFN Exposed Pad	-40 °C	150 °C	2
Analog Devices LTC7840EUFD#PBF	Boost	Surface Mount	28-QFN (4x5)	96 %	Current Limit Enable Frequency Control Power Good	50 kHz	425 kHz	Step-Up	2	Positive	28-WFQFN Exposed Pad	-40 °C	125 ¯C	2
Analog Devices LTC7840HFE#TRPBF	Boost	Surface Mount	28-TSSOP-EP	96 %	Current Limit Enable Frequency Control Power Good	50 kHz	425 kHz	Step-Up	2	Positive	28-TSSOP Exposed Pad	-40 °C	150 °C	2	4.4 mm	0.173 in

Catalog

2-Phase Dual Output Non-Synchronous Boost Controller with Hiccup Mode

Key Features

• Wide VINRange: 5.5V to 60V

• Configurable for Dual Phase Single/Dual Output Operation

• Peak Current Mode Control with Smooth Quadratic Slope Compensation and Dynamic Slope Recovery

• Adjustable Max Duty Cycle

• Adjustable Min On-Time

• Hiccup Mode for Overcurrent Protection

• Adjustable Current Sense Limit

• Output Overvoltage Protection

• Programmable and Phase-Lockable Operating Frequency (from 50kHz to 425kHz)

• Adjustable Soft-Start Current Ramping

• ±1% Internal Voltage Reference

• Internal 10V LDO Regulator for Gate Driver

• Two RUN Pins and Dual Power Good Monitors

• Flexible Topology for Boost, SEPIC and Flyback

Description

The LTC®7840 is a dual phase dual output, constant frequency current mode, nonsynchronous boost controller that drives N-channel power MOSFETs. The nonsynchronous topology makes the output voltage dependent on the choice of external components.A wide 5.5V to 60V input supply range can accommodate high input voltage surges. The LTC7840 can be configured as a dual phase single output or dual output controller. It can be also configured for the SEPIC and flyback topologies. The switching frequency is programmed by the voltage on the FREQ pin or synchronized to an external clock. The LTC7840 features a precise 1.2V internal reference. It has two RUN pins and two power good output indicators.The LTC7840 has an internal 10V LDO with undervoltage lockout protection for its on-chip gate driver. The maximum duty cycle and blanking time can be programmed by the voltage on DMAXand BLANK pins, respectively. The hiccup mode protects the system in the event of faults.The LTC7840 is available in a 28-lead thermally enhanced TSSOP package (FE28) or a 28-lead QFN package (UFD28).ApplicationsAutomotive System, Telecom System and Industrial Power Supplies