MFG:ST Package Cooled:DIP D/C:2002
MFG: ST
Package Cooled: DIP
D/C: 2002
Description: The L4978 is a step down monolithic power switching regulator delivering 2A at a voltage between 3.3V ...
The L4978 is a step down monolithic power switching regulator delivering 2A at a voltage between 3.3V and 50V (selected by a simple external divider). Realized in BCD mixed technology,the device uses an internal power D-MOS transistor (with a typical Rdson of 0.25W) to obtain very high efficency and high switching speed.
A switching frequency up to 500KHz is achievable (the maximum power dissipation of the packages must be observed).
A wide input voltage range between 8V to 55V and output voltages regulated from 3.3V to 50V cover the majority of today's applications.
Features of this new generations of DC-DC converter include pulse-by-pulse current limit, hiccup mode for short circuit protection, voltage feedforward regulation, soft-start, protection against feedback loop disconnection, inhibit for zero current consumption and thermal shutdown.
The device is available in plastic dual in line,MINIDIP 8 for standard assembly, and SO16W for SMD assembly.
|
Symbol |
Parameter |
Value |
Unit | ||
|
Minidip |
SO16 | ||||
|
V5 |
V11 |
Input voltage |
58 |
V | |
|
V4 |
V5,V6 |
Output DC voltage Output peak voltage at t = 0.1s f=200KHz |
-1 -5 |
V V | |
|
I4 |
I5,I6 |
Maximum output current |
int. limit. |
||
|
V6-V5 |
V12-V11 |
14 |
V | ||
|
V6 |
V12 |
Bootstrap voltage |
70 |
V | |
|
V7 |
V13 |
Analogs input voltage (VCC = 24V) |
12 |
V | |
|
V2 |
V3 |
Analogs input voltage (VCC = 24V) |
13 |
V | |
|
V8 |
V14 |
(VCC = 20V) |
6 -0.3 |
V V | |
|
Ptot |
Power dissipation a Tamb 60°C | Minidip |
1 |
W | |
| SO16 |
0.8 |
W | |||
|
Tj,Tstg |
Junction and storage temperature |
-40to150 |
°C | ||
L4978
PDF/DataSheet Download
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