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L4973D3.3-L4973D5.1 데이터시트 PDF




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부품번호 L4973D3.3-L4973D5.1 기능
기능 3.5A STEP DOWN SWITCHING REGULATOR
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L4973D3.3-L4973D5.1 데이터시트, 핀배열, 회로
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




L4973D3.3-L4973D5.1 pdf, 반도체, 판매, 대치품
L4973V3.3 - L4973V5.1 - L4973D3.3 - L4973D5.1
ELECTRICAL
ROSC = 20K;
CHARACTERISTICS ( Refer
unless otherwise specified)
to the test circuit,VCC = 24V; Tj = 25°C,
= specifications referred to TJ from 0 to
COSC =
125°C.
2.7nF;
Symbol
Parameter
DYNAMIC CHARACTERISTICS
Input Voltage Range (*)
Output Voltage
L4973V5.1
Output Voltage
L4973V3.3
RDSON
Maximum Limiting Current
η Efficiency
Switching Frequency
Supply Voltage Ripple
Rejection
fsw Switching Frequency Stability
vs, Supply Voltage
REFERENCE SECTION
Reference Voltage
Line Regulation
Load Regulation
Short Circuit Current
SOFT START
Soft Start Charge Current
Soft Start Discharge Current
Test Conditions
VO = VREF to 40V; IO = 3.5A
IO = 1A
IO = 0.5A to 3.5A
VCC = 8V to 55V
IO = 1A
IO = 0.5A to 3.5A
VCC = 8V to 40V
VCC = 10.5V
IO = 3.5A
VCC = 8V to 55V
VO = 5.1V; IO = 3.5A
VO = 3.3V; IO = 3.5A
Vi = VCC +2VRMS
VO = Vref; IO = 1A; fripple = 100Hz
VCC = 8V to 55V
Iref = 0 to 20mA;
VCC = 8 to 55V
Iref = 0mA;
VCC = 8 to 55V
Vref = 0 to 5mA;
VCC = 0 to 20mA
Min.
8
5.05
5.00
4.95
3.326
3.292
3.26
4
90
60
5.025
4.950
30
30
15
Typ.
5.1
5.1
5.1
3.36
3.36
3.36
0.15
4.5
90
85
100
2
5.1
5.1
5
2
6
65
45
22
Max.
55
5.15
5.20
5.25
3.393
3.427
3.46
0.22
0.35
5.5
110
5
5.175
5.250
10
10
25
100
60
30
Unit
V
V
V
V
V
V
V
A
%
%
KHz
dB
%
V
V
mV
mV
mV
mA
µA
µA
INHIBIT
High Level Voltage
Low Level Voltage
Isource High Level
Isource Low Level
DC CHARACTERISTICS
Total Operating Quiescent
Current
Quiescent Current
Total stand-by quiescent
current
ERROR AMPLIFIER
High Level Output Voltage
Low Level Output Voltage
Source Bias Current
Source Output Current
VINH = 3V
VINH = 0.8V
Duty Cycle = 50%
Duty Cycle = 0
VCC = 24V; VINH = 5V
VCC = 55V; VINH = 5V
3.0
V
0.8 V
10 16 50 µA
10 15 50 µA
4 6 mA
2.7 4 mA
100 200 µA
150 300 µA
11.0
0.65
123
200 300 600
V
V
µA
µA
4/16

4페이지










L4973D3.3-L4973D5.1 전자부품, 판매, 대치품
L4973V3 - L4973V5 - L4973D3 - L4973D5
Figure 1c: Application Circuit (see fig. 1 part list)
VCC INH SYNC
R2
C1 C2 C7
7,8 10 18
1
17 L4973V5.1
9
16
11
4,5,6
2,3
13,14,15 12
C8
L1
Vo
C3 C4 C5
R1
C6
D1 3 x
C0
C12
D97IN665A
Figure 1d: Application Circuit (see fig. 1 part list)
VCC INH
SYNC
R2
C1 C2 C7
7,8 10
18
1
17 L4973V3.3
9
16
11
4,5,6
2,3
13,14,15 12
C8
L1
C3 C4 C5
R1
C6
D1 3 x
C0
Vo
C12
Figure 2: Quiescent Drain Current vs. Input
Voltage (0% Duty Cycle)
D97IN664A
Figure 3: Quiescent Drain Current vs. Junction
Temperature
Ibias
(mA)
5.0
4.5
4.0
3.5
3.0
2.5
Tamb=25°C
0% DC
D97IN633A
200KHz-R2=22K
C7=1.2nF
100KHz-R2=20K
C7=2.7nF
0Hz
Ibias
(mA)
4.0
3.5
0% DC
VCC = 35V
3.0
D97IN634
200KHz-R2=22K
C7=1.2nF
100KHz-R2=20K
C7=2.7nF
0Hz
2.0
0
10 20 30 40 50 VCC(V)
2.5
-50 0 50 100 Tj(°C)
7/16

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L4973D3.3-L4973D5.1

3.5A STEP DOWN SWITCHING REGULATOR

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