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PDF L4973D51 Data sheet ( Hoja de datos )

Número de pieza L4973D51
Descripción 3.5A STEP DOWN SWITCHING REGULATOR
Fabricantes STMicroelectronics 
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No Preview Available ! L4973D51 Hoja de datos, Descripción, Manual

L4973V3.3 - L4973V5.1
® L4973D3.3 - L4973D5.1
3.5A STEP DOWN SWITCHING REGULATOR
UPTO 3.5ASTEP DOWNCONVERTER
OPERATING INPUT VOLTAGE FROM 8V TO
55V
3.3V AND 5.1V (±1%) FIXED OUTPUT, AND
ADJUSTABLE OUTPUTS FROM:
0V TO 50V (3.3V type)
5.1V TO 50V (5.1 type)
FREQUENCY ADJUSTABLE UP TO 300KHz
VOLTAGE FEED FORWARD
ZERO LOAD CURRENT OPERATION (min
1mA)
INTERNAL CURRENT LIMITING (PULSE BY
PULSE AND HICCUP MODE)
PRECISE 5.1V (1.5%) REFERENCE VOLT-
AGE EXTERNALLY AVAILABLE
INPUT/OUTPUT SYNCHRONIZATION FUNC-
TION
INHIBIT FOR ZERO CURRENT CONSUMP-
TION (100µA Typ. at VCC = 24V)
PROTECTION AGAINST FEEDBACK DIS-
CONNECTION
THERMAL SHUTDOWN
OUTPUT OVERVOLTAGE PROTECTION
SOFT START FUNCTION
TYPICAL APPLICATION CIRCUIT (POWERDIP)
MULTIPOWER BCD TECHNOLOGY
POWERDIP (12+3+3)
SO20(12+4+4)
ORDERING NUMBERS:
L4973V3.3 (Powerdip)
L4973D3.3 (SO20)
L4973V5.1 (Powerdip)
L4973D5.1 (SO20)
DESCRIPTION
The L4973 is a step down monolithic power
switching regulator delivering 3.5A at fixed volt-
ages of 3.3V or 5.1V and using a simple external
divider output adjustable voltage up to 50V.
Realized in BCD mixed technology, the device
VCC (8V to 55V)
CIN
ROSC
C2
78
L4973
1
4,5,6,
13,14,15 16 17
10 12
9
3
11 2
CBOOT
L1
COSC
CSS
RCOMP
CCOMP
D1
VO(3.3V or 5.1V)
COUT
D97IN554A
April 2000
1/16

1 page




L4973D51 pdf
L4973V3 - L4973V5 - L4973D3 - L4973D5
ELECTRICAL CHARACTERISTICS (continued)
Sink Output Current
Supply Voltage Ripple
Rejection
DC Open Loop Gain
Transconductance
OSCILLATOR SECTION
Ramp valley
Ramp peak
Maximum Duty Cycle
Maximum Frequency
SYNC FUNCTION
High Input Voltage
Low Input Voltage
Slave Sink Current
Master Output Amplitude
Output Pulse Width
VCOMP = VFB
CREF =4.7µF 1-5mA load
current
RL =
Icomp = -0.1 to 0.1mA;
Vcomp = 6V
VCC = 8V
VCC = 55V
Duty Cycle = 0%; ROSC =
13K; COSC = 820pF;
VCC = 8V to 55V
VCC = 8V to 55V
Isource = 3mA
no load, Vsync = 4.5V
(*) Pulse testing with a low duty cycle.
(**) The maximum power dissipation of the package must be observed.
200 300
60 80
50 60
2.5
µA
dB
dB
mS
0.78 0.85 0.92
V
1.9 2.1 2.3
V
9
9.6 10.2
V
95 97
%
500 KHz
3.5
0.15
4
0.20
0.25
4.5
0.35
0.9
0.45
V
V
mA
V
µs
Figure 1. Evaluation Board Circuit
VCC
R2
C1 C2 C7
(DIP18)
7,8
1
17 L4973
12
9
16 4,5,6 2,3
11 10 13,14,15
C3 C4 C5
R1
C6
C8 L1
3x
D1 C0
VO
R3
C12
R4
C1=1000µF/63V
C2=220nF/63V
C3=470nF
C4=1µF/50V
C5=220pF
C6=22nF
C7=2.7nF
C8=220nF/63V
C0=100µF/40V(C9,C10,C11)
C12=Optional (220nF)
L1=150µH KOOLµ 77310 - 40 Turns - 0.9mm
R1=9.1K
R2=20K
D1=GI SB560
D97IN515B
L4973 V3.3
VO(V)
3.3
R3(K)
0
R4(K)
5.1 2.7 4.7
12 12 4.7
15 16 4.7
18 20 4.7
24 30 4.7
L4973 V5.1
VO(V)
5.1
R3(K)
0
R4(K)
12 6.2 4.7
15 9.1 4.7
18 12 4.7
24 18 4.7
5/16

5 Page





L4973D51 arduino
Figure 22: Efficiency vs. Output Current
(see fig.1d)
η D97IN662
(%)
90
Vcc=12V
VO = 3.3V
fsw = 200KHz
85
Vcc=24V
80
Vcc=48V
75
70
0 0.5 1 1.5 2 2.5 3 3.5 IO(A)
Figure 24: Power dissipation vs. Output Voltage
(Device only)
Pdiss
(W)
D97IN648
3.0
VCC = 35V
fsw = 100KHz
2.5
IO=3.5A
2.0 IO=3A
1.5 IO=2.5A
1.0 IO=2A
0.5 IO=1A
0
0 5 10 15 20 25 30 VO(V)
Figure 26: Load Transient
IO
(A)
3
2
1
T
2
200µs/DIV
T
1
D97IN649
VCC = 35V
fsw = 100KHz
VO
(mV)
100
0
-100
L4973V3 - L4973V5 - L4973D3 - L4973D5
Figure 23: Power dissipation vs. Input Voltage
(Device only) (see fig.1c)
Pdiss
(W)
1.5
IO=3.5A
D97IN647A
VO = 5.1V
fsw = 100KHz
IO=3A
1.0
IO=2.5A
0.5 IO=2A
0
0 10 20 30 40 50 Vcc(V)
Figure 25: Pulse by Pulse Limiting Current vs.
Junction Temperature
Ilim
D97IN652
(A)
5.2
5
4.8
Vcc=35
4.6
4.4
4.2
-40 -20 0 20 40 60 80 100 120 Tj(°C)
Figure 27: Line Transient
VCC
(V)
30
20
10
1
2
1ms/DIV
D97IN650
IO = 1A
fsw = 100KHz
VO
(mV)
100
0
-100
11/16

11 Page







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