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Partno	Mfg	Dc	Qty	Available	Descript
L5983	ST	N/a	732	avai	Up to 1.5 A step down switching regulator
L5983TR	ST	N/a	6	avai	Up to 1.5 A step down switching regulator

L5983 ,Up to 1.5 A step down switching regulatorFunctional description . . . . . . . 74.1 Oscillator and synchronization . . 84.2 Soft-sta ..
L5983TR ,Up to 1.5 A step down switching regulatorFeaturesThe L5983 is a step-down switching regulator  1.5 A DC output currentwith a 2.0 A (min.) c ..
L5985 ,Up to 2 A step down switching regulatorFunctional description . . . . . . . 84.1 Oscillator and synchronization . . 94.2 Soft-sta ..
L5985TR ,Up to 2 A step down switching regulatorFeaturesThe L5985 is a step-down switching regulator  2 A DC output currentwith a 2.5 A (min.) cur ..
L5986 ,2.5 A step-down switching regulatorFunctional description . . . . . . . 85.1 Oscillator and synchronization . . 95.2 Soft-sta ..
L5987 ,3 A step-down switching regulatorFeaturesThe L5987 is a step-down switching regulator  3 A DC output currentwith a 3.5 A (minimum) ..
LC04-6 , Dual Low Capacitance TVS Array for Telecom LineCard Applications　
LC04-6 , Dual Low Capacitance TVS Array for Telecom LineCard Applications　
LC04-6 , Dual Low Capacitance TVS Array for Telecom LineCard Applications　
LC05-6 , Dual Low Capacitance TVS Array for Telecom Line-Card Applications　
LC05-6 , Dual Low Capacitance TVS Array for Telecom Line-Card Applications　
LC05-6 , Dual Low Capacitance TVS Array for Telecom Line-Card Applications　

L5983-L5983TR
Up to 1.5 A step down switching regulator
May 2014 DocID13005 Rev 8 1/41
L5983
1.5 A step-down switching regulator
Datasheet - production data
Features 1.5 A DC output current 2.9 V to 18 V input voltage Output voltage adjustable from 0.6 V 250 kHz switching frequency, programmable
up to 1 MHz Internal soft-start and inhibit Low dropout operation: 100% duty cycle Voltage feedforward Zero load current operation Overcurrent and thermal protection VFQFPN8 3 x 3 mm package
Applications Consumer: STB, DVD, DVD recorder, car
audio, LCD TV and monitors Industrial: chargers, PLD, PLA, FPGA Networking: XDSL, modems, DC-DC modules Computer: optical storage, hard disk drive,
printers, audio/graphic cards LED driving
Description
The L5983 is a step-down switching regulator
with a 2.0 A (min.) current limited embedded
Power MOSFET, so it is able to deliver an output
current in excess of 1.5 A DC to the load.
The input voltage can range from 2.9 V to 18 V,
while the output voltage can be set starting from
0.6 V to VIN. Having a minimum input voltage of
2.9 V, the device is suitable also for a 3.3 V bus.
Requiring a minimum set of external components,
the device includes an internal 250 kHz switching
frequency oscillator that can be externally
adjusted up to 1 MHz.
The VFQFPN package with an exposed pad
allows reducing the RthJA down to approximately
60 °C/W.
Figure 1. Application circuit
Contents L5983
2/41 DocID13005 Rev 8
Contents Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.1 Oscillator and synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.2 Soft-start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.3 Error amplifier and compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
4.4 Overcurrent protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.5 Inhibit function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.6 Hysteretic thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.1 Input capacitor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.2 Inductor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.3 Output capacitor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.4 Compensation network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.4.1 Type III compensation network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.4.2 Type II compensation network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.5 Thermal considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.6 Layout considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.7 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Application ideas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
6.1 Positive buck-boost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
6.2 Inverting buck-boost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
DocID13005 Rev 8 3/41
L5983 Contents Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Pin settings L5983
4/41 DocID13005 Rev 8
1 Pin settings
1.1 Pin connection
1.2 Pin description

Table 1. Pin description
DocID13005 Rev 8 5/41
L5983 Maximum ratings
2 Maximum ratings
2.1 Absolute maximum ratings

2.2 Thermal data

Table 2. Absolute maximum ratings
Table 3. Thermal data Package mounted on demonstration board.

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