L5973D013TR ,UP TO 2.5A STEP DOWN SWITCHING REGULATORL5973D2.5A SWITCH STEP DOWN SWITCHING REGULATOR■ 2.5A INTERNAL SWITCH■ OPERATING INPUT VOLTAGE FROM ..
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L5973-L5973D013TR
UP TO 2.5A STEP DOWN SWITCHING REGULATOR
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L5973DSeptember 2003 2.5A INTERNAL SWITCH OPERATING INPUT VOLTAGE FROM 4.4V TO 36V 3.3V / (±2%) REFERENCE VOLTAGE OUTPUT VOLTAGE ADJUSTABLE FROM
1.235V TO 35V LOW DROPOUT OPERATION: 100% DUTY
CYCLE 250KHz INTERNALLY FIXED FREQUENCY VOLTAGE FEEDFORWARD ZERO LOAD CURRENT OPERATION INTERNAL CURRENT LIMITING INHIBIT FOR ZERO CURRENT
CONSUMPTION SYNCHRONIZATION PROTECTION AGAINST FEEDBACK
DISCONNECTION THERMAL SHUTDOWN
APPLICATIONS: CONSUMER: STB, DVD, TV, VCR,CAR
RADIO, LCD MONITORS NETWORKING: XDSL, MODEMS,DC-DC
MODULES COMPUTER: PRINTERS, AUDIO/GRAPHIC
CARDS, OPTICAL STORAGE, HARD DISK
DRIVE INDUSTRIAL: CHARGERS, CAR BATTERY
DC-DC CONVERTERS
DESCRIPTIONThe 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.
2.5A SWITCH STEP DOWN SWITCHING REGULATOR
TEST APPLICATION CIRCUIT
L5973D 2/10
PIN CONNECTION
PIN DESCRIPTION
THERMAL DATA(*) Package mounted on board
ABSOLUTE MAXIMUM RATINGS
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L5973D
ELECTRICAL CHARACTERISTICS (Tj = 25°C, VCC = 12V, unless otherwise specified.)(*) Specification Referred to Tj from -40 to 125°C (1).
Notes:1. Specification over the -40 to +125 Tj Temperature range are assured by design, characterization and statistical correlation. Guaranteed by design.
L5973D 4/10
Figure 1. Line Regulation
Figure 2. Output Voltage vs. Junction
Temperature
Figure 3. Quiescent Current vs. Junction
Temperature
Figure 4. Shutdown Current vs.Junction
Temperature
Figure 5. Switching Frequency vs.Junction
Temperature
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L5973D
APPLICATION CIRCUITIn 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
Table 1. Component List
L5973D 6/10
Figure 7. PCB layout (component side)
Figure 8. PCB layout (bottom side)
Figure 9. PCB layout (front side)Below some graphs show the Tj versus output current in different conditions of the input and output voltage and
some efficiency measurements.
