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L4976 Fiches technique(PDF) 3 Page - STMicroelectronics

No de pièce L4976
Description  1A STEP DOWN SWITCHING REGULATOR
PDF  11 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L4976 Fiches technique(HTML) 3 Page - STMicroelectronics

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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 = 3.3 to 50V; Io =1A
*
8
55
V
Vo
Output voltage
Io = 0.5A
3.33
3.36
3.39
V
Io = 0.2 to 1A
3.292
3.36
3.427
V
Vcc = 8 to 55V
*
3.22
3.36
3.5
V
Vd
Dropout voltage
Vcc = 10V; Io = 1A
0.44
0.55
V
*
0.88
V
Il
Maximum limiting current
Vcc = 8 to 55V
*
1.5
2
2.5
A
Efficiency
Vo = 3.3V; Io =1A
85
%
fs
Switching frequency
*
90
100
110
KHz
SVRR
Supply voltage ripple rejection
Vi =Vcc+2VRMS;Vo =Vref;
Io = 1.A; f ripple = 100Hz
60
dB
Voltage stability of switching
frequency
Vcc = 8 to 55V
3
6
%
Temp. stability of switching
frequency
Tj = 0 to 125
°C4
%
THERMAL DATA
Symbol
Parameter
Minidip
SO16
Unit
Rth(j-amb)
Thermal Resistance Junction to ambient
Max.
90 (*)
110 (*)
°C/W
(*) Package mounted on board.
OPERATING TEMPERATURE RATING
Symbol
Parameter
Value
Unit
TJ
Junction Temperature Range
-40 to 150
°C
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
Minidip
S016
V5
V11
Input voltage
58
V
V4
V5,V6
Output DC voltage
Output peak voltage at t = 0.1
µs 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
V8
V14
(VCC = 20V)
6
-0.3
V
V
Ptot
Power dissipation a Tamb
≤ 60°C
Minidip
1W
SO16
0.8
W
Tj,Tstg
Junction and storage temperature
-40 to 150
°C
L4976
3/11



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