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PDF L5972 Data sheet ( Hoja de datos )
| Número de pieza | L5972 | |
| Descripción | 2A SWITCH STEP DOWN SWITCHING REGULATOR | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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L5972D
2A SWITCH STEP DOWN SWITCHING REGULATOR
s 2A INTERNAL SWITCH
s OPERATING INPUT VOLTAGE FROM 4.4V
TO 36V
s OUTPUT VOLTAGE ADJUSTABLE FROM
1.235V 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 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
SO8 (4+2+2)
ORDERING NUMBERS: L5972D (SO8)
L5972D013TR (Tape & Reel)
DESCRIPTION
The L5972D is a step down monolithic power switch-
ing regulator with a minimum switch current limit of
2A so it is able to deliver more than 1.5A DC current
to the load depending on the application conditions.
The output voltage can be set from 1.235V to 35V.
The device uses an internal P-Channel D-MOS tran-
sistor (with a typical Rdson of 250mΩ) as switching
element to minimize the size of the external compo-
nents.
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 com-
puter related applications.
Pulse by pulse current limit with the internal frequen-
cy modulation offers an effective constant current
short circuit protection.
TEST APPLICATION CIRCUIT
VIN = 4.4V to 35V
VCC
8
C1
10µF
35V
CERAMIC
COMP
C4
22nF
4
6
C3
220pF
R3
4.7K
L5972D
OUT
1
L1 33µH
D1
STPS2L40U
5
237
FB
GND
VOUT=3.3V
R1
5.6K
R2
3.3K
C2
100µF
10V
May 2003
D03IN1436
1/10
1 page  
L5972D
APPLICATION CIRCUIT
In figure 7 is shown the demo board application circuit for the device in SMD version, where the input supply
voltage, Vcc, can range from 4.4V to 25V due to the rated voltage of the input capacitor and the output voltage
is adjustable from 1.235V to Vcc.
Figure 7. Demo board Application Circuit
VIN = 4.4V to 25V
VCC
8
C1
10µF
25V
CERAMIC
COMP
C4
22nF
4
6
C3
220pF
R3
4.7K
OUT
1
L5972D
5
237
FB
GND
L1 33µH
D1
STPS2L25U
VOUT=3.3V
R1
5.6K
R2
3.3K
C2
100µF
10V
D03IN1438
Table 1. Component List
Reference
Part Number
C1
C2 POSCAP 10TPB100M
C3 C1206C221J5GAC
C4 C1206C223K5RAC
R1
R2
R3
D1 STPS2L25U
L1 DO3316P-333
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, 2.1A
Manufacturer
TOKIN
Sanyo
KEMET
KEMET
Neohm
Neohm
Neohm
ST
COILCRAFT
5/10
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet L5972.PDF ] | |
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