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L5972D
UP TO 2A STEP DOWN SWITCHING REGULATOR
1/9
L5972DMay 2002 2A INTERNAL SWITCH OPERATING INPUT VOLTAGE FROM 4.4V
TO 36V 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 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 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.
2A SWITCH STEP DOWN SWITCHING REGULATOR
TEST APPLICATION CIRCUIT
L5972D 2/9
PIN CONNECTION
PIN DESCRIPTION
THERMAL DATA(*) Package mounted on board (4cm2 ground-plane)
ABSOLUTE MAXIMUM RATINGS
3/9
L5972D
ELECTRICAL CHARACTERISTICS (Tj = 25°C, VCC = 12V, unless otherwise specified.)(*) Specification Referred to Tj from -40 to 125°C.
L5972D 4/9
Figure 1. Output Voltage vs. Junction
Temperature
Figure 2. Line Regulation
Figure 3. Output Voltage vs. Junction
Temperature
Figure 4. Quiescent Current vs. Junction
Figure 5. Shutdown Current vs.Junction
Temperature
Figure 6. Switching Frequency vs.Junction
Temperature
5/9
L5972D
APPLICATION CIRCUITIn 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
Table 1. Component List
L5972D 6/9
Figure 8. PCB layout (component side)
Figure 9. PCB layout (bottom side)
Figure 10. PCB layout (front side)Sideways two graphs show the Tj versus output cur-
rent in different conditions of the input and output
voltage.
Figure 11. Junction Temperature vs. Output
Current
Figure 12. Junction Temperature vs. Output
Current
