Product Summary

The L4978 is a step down monolithic powerswitching regulator delivering 2A at a voltage be-tween 3.3V and 50V (selected by a simple exter-nal divider) . Realized in BCD mixed technology,the L4978 uses an internal power D-MOS transis-tor (with a typical Rdson of 0.25Ω) to obtain veryhigh efficency and high switching speed. The L4978 is available in plastic dual in line, MINI DIP8 for standard assembly, and SO16W or SMD assembly.

Parametrics

L4978 absolute maximum ratings: (1) Input voltage: 58V; (2) Output DC voltage Output peak voltage at t=0.1μs, f=200KHz; (3) maximum output current: int.limit.; (4) Bootstra voltage: 70V; (5) Analogs input voltage (Vcc=24V) : 12V; (6) Analogs input voltage (Vcc=24V) : 12V; (7) Power dissipation a Tamb≤60°C; (8) Junction and storage temperature: -40 to 150°C.

Features

L4978 features: (1) up to 2A step down converter; (2) operatinf input voltage from 8V to 5V; (3) precise 3.3V ((±1%) internal reference voltage; (4) output voltage adjustable from 3.3V to 50V; (5) switching frequency adjustable 500kHz; (6) voltage adjustable from 3.3V to 50V; (7) zero load current operation; (8) thermal shutdown.

Diagrams

L4978 Block Diagram

Image Part No Mfg Description Data Sheet Download Pricing
(USD)		 Quantity
L4978D
L4978D
STMicroelectronics
Switching Converters, Regulators & Controllers 3.3 to 50V Step-Down
Data Sheet
0-1: $2.21
1-10: $2.05
10-100: $1.60
100-250: $1.46
L4978D013TR
L4978D013TR
STMicroelectronics
Switching Converters, Regulators & Controllers 3.3 to 50V Step-Down
Data Sheet
0-735: $1.40
735-1000: $1.32
1000-2000: $1.26
L4978
L4978
STMicroelectronics
Switching Converters, Regulators & Controllers 3.3 to 50V Step-Down
Data Sheet
0-1: $2.21
1-10: $2.05
10-100: $1.60
100-250: $1.46