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L4976-L4976D
1A STEP DOWN SWITCHING REGULATOR
UP TO 1A STEP DOWN CONVERTER
OPERATING INPUT VOLTAGE FROM 8V TO
55V
PRECISE 5.1V REFERENCE VOLTAGE
OUTPUT VOLTAGE ADJUSTABLE FROM
0.5V TO 50V
SWITCHING FREQUENCY ADJUSTABLE UP
TO 300KHz
VOLTAGE FEEDFORWARD
ZERO LOAD CURRENT OPERATION
INTERNAL CURRENT LIMITING (PULSE-BY-
PULSE AND HICCUP MODE)
PROTECTION AGAINST FEEDBACK DIS-
CONNECTION
THERMAL SHUTDOWN
DESCRIPTIONThe L4976 is a step down monolithic power
switching regulator delivering 1A at a voltage be-
tween 3.3V and 50V (selected by a simple exter-
nal divider). Realized in BCD mixed technology,
the device uses an internal power D-MOS transis-
tor (with a typical Rdson of 0.25Ω) to obtain very
high efficency and high switching speed.
A switching frequency up to 300KHz is achiev-
able (the maximum power dissipation of the pack-
ages must be observed).
A wide input voltage range between 8V to 55V
and output voltages regulated from 3.3V to 40V
cover the majority of today’s applications.
Features of this new generations of DC-DC con-
verter include pulse-by-pulse current limit, hiccup
mode for short circuit protection, voltage feedfor-
ward regulation, protection against feedback loop
disconnection and thermal shutdown.
The device is available in plastic dual in line,
MINIDIP 8 for standard assembly, and SO16W
for SMD assembly.
L49761A STEP DOWN SWITCHING REGULATOR
TYPICAL APPLICATION CIRCUIT
PIN FUNCTIONS(*) Pins 1, 7, 8, 9, 10, 15 and 16 are not internally, electrically connected to the die.
PIN CONNECTIONS
BLOCK DIAGRAM
L4976
ELECTRICAL CHARACTERISTICS (Tj = 25°C, Cosc = 2.7nF, Rosc = 20kΩ, VCC = 24V, unless other-wise specified.) * Specification Refered to Tj from 0 to 125°C
THERMAL DATA(*) Package mounted on board.
OPERATING TEMPERATURE RATING
ABSOLUTE MAXIMUM RATINGS
L4976
ELECTRICAL CHARACTERISTICS (continued)
L4976
5101520253035404550 Vcc(V)(mA)
D97IN724
Figure 1. Quiescent drain current vs. input
voltage. 0.2 0.4 0.6 0.8 1.0 1.2 1.4 IO(A)
(V)
D97IN734
Figure 4. Load regulation-50 -30 -1010 30 50 70 90 110 Tj(˚C)
(mA)
D97IN731
Figure 2. Quiescent current vs. junction
temperature 20 40 60 80 R1(KΩ)5
fsw
(KHz)
D97IN784
Figure 5. Switching frquency vs. R1 and C25 101520253035404550 VCC(V)
(V)
D97IN733
Figure 3. Line Regulation 5101520253035404550 VCC(V)
fsw
(KHz)
D97IN735
Figure 6. Switching Frequency vs. input
voltage.
L4976
0.2 0.4 0.6 0.8 1.0 1.2 1.4 IO(A)60(%)
D97IN739
Figure 11. Efficiency vs. output current. 5 10 15 20 25 VO(V)
(%) D97IN737
Figure 9. Efficiency vs output voltage.0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 IO(A)
(V)
D97IN736
Figure 8. Dropout voltage between pin 5 and 4.0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 IO(A)60
(%)
D97IN738
Figure 10. Efficiency vs. output current.-50 0 50 100 Tj(˚C)
fsw
(KHz)
D97IN785
Figure 7. Switching frequency vs. junction
temperature. 0.2 0.4 0.6 0.8 1.0 1.2 1.4 IO(A)60
(%)
D97IN740
Figure 12. Efficiency vs. output current.
L4976
