Le blog de l'entreprise Mingjiada Electronics Supply ADI LT8494 And LT8495 Series SEPIC/Boost Converter

In applications with a wide input voltage range—such as automotive electronics, industrial control and telecommunications equipment—power supply systems often face challenges such as significant fluctuations in input voltage, cold-start voltage drops and sudden load drops. ADI’s LT8494 | LT8495 series of current-mode, fixed-frequency SEPIC/boost converters feature integrated 2 A, 70 V switches and support a wide input voltage range of 3 V to 60 V, with an output voltage of up to 70 V. A key advantage of the SEPIC topology is its ability to operate with an input voltage that is higher than, lower than, or equal to the output voltage, making it particularly suitable for applications such as automotive electronic control unit (ECU) power supplies, portable device power supplies and industrial power supplies.

I. LT8494 – SEPIC/Boost DC/DC Converter with 2 A, 70 V Switch and 7 μA Quiescent Current

The LT8494 is a single-chip switch-mode regulator with adjustable frequency (250 kHz to 1.5 MHz). The quiescent current can be less than 7 μA during device operation and is approximately 0.3 μA when the SWEN pin is low. The LT8494 can be configured as a SEPIC, boost or flyback converter. Its low-ripple Burst Mode® operation maintains high efficiency under low output current conditions and keeps output ripple below 10 mV.

Key Features:

Low-ripple Burst Mode® operation:

7 μA IQ (converting from 12 VIN to 5 VOUT)

Output ripple (typically < 10 mV)

Dual supply pins:

Improved efficiency

Minimum supply voltage reduced to ~1 V after start-up to extend battery life

Wide input voltage range: ~1 V to 60 V (for start-up from 2.5 V to 32 V)

Power Good (PG) circuit operates with input supply as low as 1.3 V

Resistant to FMEA faults in TSSOP packaging

Fixed-frequency PWM, SEPIC / boost / flyback topologies

NPN power switch: 2A/70V

Programmable switching frequency: 250kHz to 1.5MHz

Undervoltage lockout (UVLO) can be programmed on the SWEN pin

Soft-start can be programmed using a single capacitor

II. LT8495 – SEPIC/Boost Converter with 2A, 70V Switching Capability, 9μA Quiescent Current, Power-On Reset (POR) and Watchdog Timer

The LT8495 is a monolithic switch-mode regulator with adjustable frequency (250kHz to 1.5MHz), featuring power-on reset and a watchdog timer. The quiescent current can be less than 9 μA whilst the device is operating, and is approximately 0.3 μA when the SWEN, WDE and RSTIN pins are at a low level. The device can be configured as a SEPIC, boost or flyback converter; its low-ripple Burst Mode® operation maintains high efficiency under low output current conditions and keeps output ripple below 10 mV.

Key Features:

Wide input voltage range: ~1 V to 60 V (for start-up: 2.5 V to 32 V)

Low-ripple Burst Mode® operation

9 μA IQ (during conversion from 12 VIN to 5.0 VOUT)

Output ripple (typically <10 mV)

Dual power supply pins

Improved efficiency

Minimum supply voltage reduced to ~1 V after start-up to extend battery life

Integrated 2 A/70 V power switch

Programmable watchdog timer capable of operating when the VIN supply is removed

Programmable power-on reset (POR) timer capable of performing the RST function when the input supply is as low as 1.3 V

Resistant to FMEA faults in TSSOP packaging

Fixed-frequency PWM, SEPIC / boost / flyback topologies

Programmable switching frequency: 250 kHz to 1.5 MHz

Undervoltage lockout (UVLO) can be programmed on the SWEN and RSTIN pins

Soft-start can be programmed using a single capacitor

Supply Information

Shenzhen Mingjiada Electronics Co., Ltd. — a long-standing distributor of the ADI/Linear product range — maintains a regular stock of LT8494 | LT8495 series SEPIC and boost converters, including but not limited to the following:

LT8494EFE

LT8494EUF

LT8494HFE

LT8494IFE

LT8494IUF

LT8495EFE

LT8495EUF

LT8495HFE

LT8495IFE

LT8495IUF

Mingjiada Electronics supports sample orders, small-batch purchases and full-reel supply. To confirm specific part numbers, stock levels and real-time prices, please visit the Mingjiada Electronics website (https://www.integrated-ic.com/) for further supply details.