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L5970D Schematic ( PDF Datasheet ) - STMicroelectronics

Teilenummer L5970D
Beschreibung UP TO 1A STEP DOWN SWITCHING REGULATOR
Hersteller STMicroelectronics
Logo STMicroelectronics Logo 




Gesamt 10 Seiten
L5970D Datasheet, Funktion
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 Datasheet, Funktion
L5970D
Figure 10. Demoboard schematic
VREF
3.3V
VIN = 4.4V to 25V
VCC
SYNC.
6
8
2
L5970D
1
C1
10µF
25V
CERAMIC
COMP
C4
22nF
43
INH.
C3
220pF
R3
4.7K
5
7
GND
OUT L1 33µH
VOUT=3.3V
D1
STPS2L25U R1
FB
5.6K
C2
100µF
10V
R2
3.3K
D03IN1437
Part list demoboard
Reference
C1
C2
C3
C4
R1
R2
R3
D1
L1
Part Number
POSCAP 10TPB100M
C1206C221J5GAC
C1206C223K5RAC
STPS2L25U
DO3316P-333
Figure 11. Efficiency vs. Output Current
Description
10µF, 25V
100µF, 10V
220pF, 5%, 50V
22nF, 10%, 50V
5.6K, 1%, 0.1W 0603
3.3K, 1%, 0.1W 0603
4.7K, 1%, 0.1W 0603
2A, 25V
33µH, 2A
Manufacturer
TOKIN
Sanyo
KEMET
KEMET
Neohm
Neohm
Neohm
STMicroelectronics
COILCRAFT
Figure 12. Efficiency vs. Output Current
94
92
90 Vo=3.3V
88
86
84 Vo=2.5V
82
80
78 Vo=1.8V
76
74 Vcc=5V
72
70
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
Io (A)
1
92
90 Vo=5V
88
86 Vo=3.3V
84
82
80
78 Vo=2.5V
76
74 Vcc=12V
72
70
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Io (A)
6/10

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