Want to post a buying lead? If you are not a member yet, please select the specific/related part number first and then fill the quantity and your contact details in the "Request for Quotation Form" on the left, and then click "Send RFQ".Your buying lead can then be posted, and the reliable suppliers will quote via our online message system or other channels soon.
The L4973 is a step down monolithic power switching regulator delivering 3.5A at fixed voltages of 3.3V or 5.1V and using a simple external divider output adjustable voltage up to 50V.
Realized in BCD mixed technology, the device uses an internal power D-MOS transistor (with a typical Rdson of 0.15ohm) to obtain very high efficiency and very fast switching times.Switching frequency up to 300KHz are achievable (the maximum power dissipation of the packages 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 the today applications.
Features of this new generation of DC-DC converter includes pulse by pulse current limit, hiccup mode for output short circuit protection, voltage feed forward regulation, soft start, input/output synchronization, protection against feedback loop disconnection, inhibit for zero current consumption and thermal shutdown.
Packages available are in plastic dual in line, DIP-18 (12+3+3) for standard assembly, and SO20 (12+4+4) for SMD assembly.
L4973V3.3 Maximum Ratings
Symbol
Parameter
Value
Unit
DIP-18
S0-20
V7,V8
V9,V8
Input voltage
58
V
V2,V3
V2,V3
Output DC voltage Output peak voltage at t = 0.1s f=200KHz
-1 -5
V V
I2,I3
I2,I3
Maximum output current
int. limit.
V9-V8
V10-V8
14
V
V9
V10
Bootstrap voltage
70
V
V11
V12
Analogs input voltage (VCC = 24V)
12
V
V17
V19
Analogs input voltage (VCC = 24V)
13
V
V12
V13
(VCC = 20V)
6 -0.3
V V
V18
V20
(VCC = 20V)
5.5 -0.3
V V
V10
V11
Inhibit
Vcc -0.3
V V
Ptot
Power dissipation a Tpins 90°C (Tamb = 70°C no copper area) (Tamb = 70°C 4cm copper area on PCB)
DIP 12+3+3
5 1.3 2
W W W
Power dissipation a Tpins = 90°C
SO20
4
W
Tj,Tstg
Junction and storage temperature
-40to150
°C
L4973V3.3 Features
·UPTO3.5ASTEPDOWNCONVERTER ·OPERATING INPUT VOLTAGE FROM 8V TO 55V ·3.3V AND 5.1V (±1%) FIXED OUTPUT, AND ADJUSTABLE OUTPUTS FROM:0V TO 50V (3.3V type) 5.1V TO 50V (5.1 type) ·FREQUENCYADJUSTABLE UP TO300KHz ·VOLTAGEFEED FORWARD ·ZERO LOAD CURRENT OPERATION (min 1mA) ·INTERNAL CURRENT LIMITING (PULSE BY PULSE AND HICCUPMODE) ·PRECISE 5.1V (1.5%) REFERENCE VOLTAGE EXTERNALLY AVAILABLE ·INPUT/OUTPUT SYNCHRONIZATION FUNCTION ·INHIBIT FOR ZERO CURRENT CONSUMPTION (100mA Typ. at VCC = 24V) ·PROTECTION AGAINST FEEDBACK DISCONNECTION ·THERMAL SHUTDOWN ·OUTPUT OVERVOLTAGEPROTECTION ·SOFT START FUNCTION