L4978(2000) Ver la hoja de datos (PDF) - STMicroelectronics
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L4978 Datasheet PDF : 12 Pages
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L4978
THERMAL DATA
Symbol
Parameter
Rth(j-amb) Thermal Resistance Junction to ambient
(*) Package mounted on board.
Max.
Minidip
90 (*)
SO16
110 (*)
Unit
°C/W
ABSOLUTE MAXIMUM RATINGS
Symbol
Minidip
S016
V5
V11
V4
V5,V6
I4
V6-V5
V6
V7
V2
V8
I5,I6
V12-V11
V12
V13
V3
V14
Parameter
Input voltage
Output DC voltage
Output peak voltage at t = 0.1µs f=200KHz
Maximum output current
Bootstrap voltage
Analogs input voltage (VCC = 24V)
Analogs input voltage (VCC = 24V)
(VCC = 20V)
Ptot
Power dissipation a Tamb ≤ 60°C
Tj,Tstg
Junction and storage temperature
Value
Unit
58
V
-1
V
-5
V
int. limit.
14
V
70
V
12
V
13
V
6
V
-0.3
V
Minidip
1
W
SO16
0.8
W
-40 to 150 °C
ELECTRICAL CHARACTERISTICS (Tj = 25°C, Cosc = 2.7nF, Rosc = 20kΩ, VCC = 24V, unless other-
wise specified.) * Specification Refered to Tj from 0 to 125°C
Symbol
Parameter
Test Condition
Min. Typ. Max. Unit
Dynamic Characteristic
VI
Operating input voltage range
Vo
Output voltage
Vd
Dropout voltage
Vo = 3.3 to 50V; Io = 2A
Io = 0.5A
Io = 0.2 to 2A
Vcc = 8 to 55V
Vcc = 10V; Io = 2A
Il
fs
SVRR
Maximum limiting current
Efficiency
Switching frequency
Supply voltage ripple rejection
Voltage stability of switching
frequency
Temp. stability of switching
frequency
Vcc = 8 to 55V
Vo = 3.3V; Io = 2A
Vi = Vcc+2VRMS; Vo = Vref;
Io = 2.5A; f ripple = 100Hz
Vcc = 8 to 55V
Tj = 0 to 125°C
•8
55
V
3.33 3.36 3.39
V
3.292 3.36 3.427 V
• 3.22 3.36
3.5
V
0.58 0.733 V
•
1.173 V
• 2.5
3
3.5
A
• 90
87
%
100 110 KHz
60
dB
3
6
%
4
%
Soft Start
Soft start charge current
Soft start discharge current
30
40
50
µA
6
10
14
µA
Inhibit
VL L
IsLL
Low level voltage
Isource Low level
•
0.9
V
•
5
15
µA
3/12
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