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PDF L5973 Data sheet ( Hoja de datos )
| Número de pieza | L5973 | |
| Descripción | 2.5A SWITCH STEP DOWN SWITCHING REGULATOR | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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L5973D
2.5A SWITCH STEP DOWN SWITCHING REGULATOR
s 2.5A INTERNAL SWITCH
s OPERATING INPUT VOLTAGE FROM 4.4V TO 36V
s 3.3V / (±2%) REFERENCE VOLTAGE
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 INHIBIT FOR ZERO CURRENT
CONSUMPTION
s SYNCHRONIZATION
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
HSOP8 - EXPOSED PAD
ORDERING NUMBER: L5973D
DESCRIPTION
The L5973D is a step down monolithic power switch-
ing regulator with a minimum switch current limit of
2.5A so it is able to deliver more than 2A DC current
to the load depending on the application conditions.
The output voltage can be set from 1.235V to 35V.
The high current level is also achieved thanks to an
SO8 package with exposed frame, that allows to re-
duce the Rth(j-amb) down to approximately 40°C/W
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
VREF
3.3V
VIN = 4.4V to 35V
VCC
SYNC.
6
8
2
L5973D
1
C1
10µF
35V
CERAMIC
COMP
C4
22nF
43
INH
C3
220pF
R3
4.7K
5
7
GND
OUT
FB
L1 15µH
D1
STPS340U
VOUT=3.3V
R1
5.6K
R2
3.3K
C2
330µF
10V
May 2003
D03IN1439
1/10
1 page  
L5973D
APPLICATION CIRCUIT
In figure 6 is shown the demo board application circuit, 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 6. Demo board Application Circuit
VREF
3.3V
VIN = 4.4V to 25V
VCC
SYNC.
6
8
2
L5973D
1
C1
10µF
25V
CERAMIC
COMP
C4
22nF
43
INH
C3
220pF
R3
4.7K
5
7
GND
OUT L1 15µH
VOUT=3.3V
D1
STPS2L25U R1
5.6K
FB
R2
3.3K
C2
330µF
6.3V
D03IN1440
Table 1. Component List
Reference
Part Number
C1
C2 POSCAP 6TPB330M
C3 C1206C221J5GAC
C4 C1206C223K5RAC
R1
R2
R3
D1 STPS2L25U
L1 DO3316P-153
Description
10µF, 25V
330µF, 6.3V
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
15µH, 3A
Manufacturer
TOKIN
Sanyo
KEMET
KEMET
Neohm
Neohm
Neohm
ST
COILCRAFT
5/10
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet L5973.PDF ] | |
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