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PDF ( 数据手册 , 数据表 ) L5970D

零件编号 L5970D
描述 UP TO 1A STEP DOWN SWITCHING REGULATOR
制造商 STMicroelectronics
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L5970D 数据手册, 描述, 功能
L5970D
UP TO 1A STEP DOWN SWITCHING REGULATOR
s UP TO 1A OUTPUT CURRENT
s OPERATING INPUT VOLTAGE FROM 4.4V
TO 36V
s 3.3V / (±2%) / REFERENCE VOLTAGE
s OUTPUT VOLTAGE ADJUSTABLE FROM
1.2V TO 35V
s LOW DROPOUT OPERATION: 100% DUTY
CYCLE
s 250KHz INTERNALLY FIXED FREQUENCY
s VOLTAGE FEEDFORWARD
s ZERO LOAD CURRENT OPERATION
s INTERNAL CURRENT LIMITING
s INHIBIT FOR ZERO CURRENT
CONSUMPTION
s SINCHRONIZATION
s PROTECTION AGAINST FEEDBACK
DISCONNECTION
s THERMAL SHUTDOWN
APPLICATIONS:
s CONSUMER: STB, DVD, TV, VCR,CAR
RADIO, LCD MONITORS
s NETWORKING: XDSL, MODEMS,DC-DC
MODULES
s COMPUTER: PRINTERS, AUDIO/GRAPHIC
CARDS, OPTICAL STORAGE, HARD DISK
DRIVE
s INDUSTRIAL: CHARGERS, CAR BATTERY
DC-DC CONVERTERS
TEST APPLICATION CIRCUIT
SO8
ORDERING NUMBERS: L5970D (SO8)
L5970D013TR (T&R)
DESCRIPTION
The L5970D is a step down monolithic power
switching regulator capable to deliver up to 1A at
output voltages from 1.2V to 35V.
The device uses an internal P-Channel D-MOS
transistor (with a typical Rdson of 250m) as
switching element to minimize the size of the ex-
ternal components.
An internal oscillator fixes the switching frequency
at 250KHz.
Having a minimum input voltage of 4.4V only, it is
particularly suitable for 5V bus, available in all
computer related applications.
Pulse by pulse current limit with the internal fre-
quency modulation offers an effective constant
current short circuit protection.
VREF
3.3V
VIN = 4.4V to 35V
VCC
SYNC.
6
8
2
L5970D
1
C1
10µF
35V
CERAMIC
COMP
C4
22nF
43
INH.
C3
220pF
R3
4.7K
5
7
GND
OUT L1 33µH
VOUT=3.3V
D1
STPS2L40U R1
FB
5.6K
C2
100µF
10V
R2
3.3K
D98IN954C
May 2003
1/10







L5970D pdf, 数据表
L5970D
APPLICATION IDEAS
Figure 16. Dual output voltage with auxiliary winding
D2
N1/N2=2 1N4148
VOUT1=5V
30mA
VIN=12V
C1
10uF
25V
Ceramic
VCC
8
C2
220pF
COMP
4
U1
L5970D
C3
22nF
2 67
SYNC VREF GND
R3
4.7k 3.3V
OUT
1
FB
5
3
INH
Lp=22uH
D1
STPS25L25U
C4
100uF
10V
VOUT=3.3V
0.5A
C5
47uF
10V
Figure 17. Buck-Boost regulator
VIN=12V
VCC
8
U1
C1
10uF
25V
Ceramic
C2
10uF
35V C3
Ceramic 220pF
COMP 4
L5970
2 67
C4
22nF
R3
4.7k
SYNC VREF GND
3.3V
OUT
1
5 FB
3
INH
2.7k
24k
L1
33uH
D1
STPS2L25U
C5
100uF
16V
VOUT=-12V/0.3A
Vin=12V Vout=-12V Iout=0.5A Efficiency=81%
Figure 18. Positive Buck-Boost regul
VIN=5V
C1
10uF
25V
Ceramic
C2
220pF
VCC
8
U1
COMP
L5970
4
2 67
C3
22nF
R3
4.7k
SYNC VREF GND
3.3V
OUT
1
5 FB
3
D1
STPS2L25U
INH
L1
33uH
D2
STPS2L25U
VOUT=12V/0.3A
24k
M1
STN4NE03L
C4
100uF
16V
2.7k
Vin=5V Vout=12V Iout=0.3A Efficiency=76%
Figure 19. Synchronization example
VIN
VCC
8
OUT
1
VCC
8
OUT
1
COMP
4
2
L5970D
67
SYNC VREF GND
FB
5
3
INH
COMP
4
2
L5970D
67
SYNC VREF GND
FB
5
3
INH
8/10














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