L5971D ,1.5A STEP DOWN SWITCHING REGULATORELECTRICAL CHARACTERISTICS (Tj = 25°C, Cosc = 2.7nF, Rosc = 20kΩ, VCC = 12V, unless other-wise spec ..
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L5972D013TR ,2A SWITCH STEP DOWN SWITCHING REGULATORL5972D2A SWITCH STEP DOWN SWITCHING REGULATOR■ 2A INTERNAL SWITCH■ OPERATING INPUT VOLTAGE FROM 4.4 ..
L5972D013TR ,2A SWITCH STEP DOWN SWITCHING REGULATORapplications.DRIVEPulse by pulse current limit with the internal frequen-■ INDUSTRIAL: CHARGERS, CA ..
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L5973A ,2A SWITCH STEP DOWN SWITCHING REGULATORBlock DiagramVCCVOLTAGESTRIMMINGMONITORVREFVSUPPLYREFBUFFERTHERMALSHUTDOWN1.235V 3.5VINH INHIBITPEA ..
LC036 ,Low Capacitance Surface Mount TVS for High-Speed Data InterfacesEFT, and lighting.
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LC03-6R2 ,Low Capacitance Surface Mount TVS for High-Speed Data Interfaces2V , REVERSE VOLTAGE (V)% OF PEAK PULSE CURRENTZV , CLAMPING VOLTAGE (V)CI , REVERSE LEAKAGE (A)RL ..
LC03-6R2G , Low Capacitance Surface Mount TVS for High-Speed Data Interfaces
LC04-6 , Dual Low Capacitance TVS Array for Telecom LineCard Applications
LC04-6 , Dual Low Capacitance TVS Array for Telecom LineCard Applications
L5971-L5971D
1.5A STEP DOWN SWITCHING REGULATOR
UP TO 1.5A STEP DOWN CONVERTER
OPERATING INPUT VOLTAGE FROM 6.5V
TO 28V
PRECISE 1.26V (±1%) INTERNAL REFER-
ENCE VOLTAGE
OUTPUT VOLTAGE ADJUSTABLE FROM
1.26V TO 20V
SWITCHING FREQUENCY ADJUSTABLE UP
TO 300KHz
VOLTAGE FEEDFORWARD
ZERO LOAD CURRENT OPERATION
INTERNAL CURRENT LIMITING (PULSE-BY-
PULSE AND HICCUP MODE)
INHIBIT FOR ZERO CURRENT CONSUMP-
TION
PROTECTION AGAINST FEEDBACK DIS-
CONNECTION
THERMAL SHUTDOWN
SOFT START FUNCTION
DESCRIPTIONThe L5971 is a step down monolithic power
switching regulator delivering 1.5A at a voltage
between 1.26V and 20V (selected by a simple
external divider). Realized in BCD mixed technol-
ogy, the device uses an internal power D-MOS
transistor (with a typical Rdson of 0.25Ω) to ob-
tain 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).
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, soft-start, protection against
feedback loop disconnection, inhibit for zero cur-
rent consumption and thermal shutdown.
The device is available in plastic dual in line,
MINIDIP 8 for standard assembly, and SO16 for
SMD assembly.
Typical Applications:- High efficiency step-down converter
- Portable computers
- Battery charger
- Distributed power
- PDAs and Mobile Comminicators
L59711.5A 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
L5971
ELECTRICAL CHARACTERISTICS (Tj = 25°C, Cosc = 2.7nF, Rosc = 20kΩ, VCC = 12V, unless other-wise specified.) * Specification Refered to Tj from 0 to 125°C
THERMAL DATA(*) Package mounted on board.
ABSOLUTE MAXIMUM RATINGS
L5971
ELECTRICAL CHARACTERISTICS (continued)
L5971
Figure 1. Test and valutation board circuit.
Figure 2. PCB and component layout of the figure 1.
L5971
5 10 15 20 25 Vcc(V)(mA)
D98IN942
Figure 3. Quiescent drain current vs. input
voltage. 5 10 15 20 25 VCC(V)60
Ibias
(μA)
D98IN944
Figure 5. Stand-by drain current vs. input
voltage-50 -30 -1010 30 50 70 90 110 Tj(˚C)
(mA)
D98IN943
Figure 4. Quiescent current vs. junction
temperature 20 40 60 80 R1(KΩ)5
fsw
(KHz)
D97IN784
Figure 7. Switching frquency vs. R1 and C2 5 10 15 20 25 VCC(V)
(V)
D98IN945
Figure 6. Line Regulation 5 10 15 20 25 VCC(V)
fsw
(KHz)
D98IN947
Figure 8. Switching Frequency vs. input
voltage.
L5971
