Product Summary

The L4978D is a step down monolithic power switching regulator delivering 2A at a voltage between 3.3V and 50V (selected by a simple external divider). The L4978D is available in plastic dual in line, MINIDIP 8 for standard assembly, and SO16W for SMD assembly.

Parametrics

L4978D absolute maximum ratings: (1)Input voltage: 58 V; (2)Maximum output current int. limit.:14 V; (3)Bootstrap voltage: 70 V; (4)Analogs input voltage (VCC = 24V): 12 V; (5)Analogs input voltage (VCC = 24V): 13 V; (6)Junction and storage temperature: -40 to 150 °C.

Features

L4978D features: (1)up to 2A step down converter; (2)operating input voltage from 8V to 55V; (3)precise 3.3V (±1%) internal reference voltage; (4)output voltage adjustable from 3.3V to 50V; (5)switching frequency adjustable up to 300KHz; (6)voltage feedforward; (7)zero load current operation; (8)internal current limiting (pulse-by-pulse and hiccup mode); (9)inhibit for zero current consumption; (10)protection against feedback disconnection; (11)thermal shutdown; (12)soft start function.

Diagrams

L4978D 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