L4973D3.3 ,3.5A STEP DOWN SWITCHING REGULATORFeatures of this new generation of DC-DC con-PIN CONNECTIONS (Top view)OSC 1 18 SYNCOSC 1 20 SYNCOU ..
L4973D3.3 ,3.5A STEP DOWN SWITCHING REGULATORFeatures of this new generation of DC-DC con-PIN CONNECTIONS (Top view)OSC 1 18 SYNCOSC 1 20 SYNCOU ..
L4973D3.3 ,3.5A STEP DOWN SWITCHING REGULATORABSOLUTE MAXIMUM RATINGSSymbolParameter Value UnitDIP-18 S0-20V ,V V ,V Input voltage 58 V7 8 9 8V ..
L4973D-3.3 ,3.5A STEP DOWN SWITCHING REGULATORABSOLUTE MAXIMUM RATINGSSymbolParameter Value UnitDIP-18 S0-20V ,V V ,V Input voltage 58 V7 8 9 8,V ..
L4973D3.3-013TR ,3.5A STEP DOWN SWITCHING REGULATORL4973V3.3 - L4973V5.1L4973D3.3 - L4973D5.1®3.5A STEP DOWN SWITCHING REGULATORUP TO 3.5A STEP DOWN C ..
L4973D5.1 ,3.5A STEP DOWN SWITCHING REGULATORL4973V3.3 - L4973V5.1L4973D3.3 - L4973D5.1®3.5A STEP DOWN SWITCHING REGULATORUP TO 3.5A STEP DOWN C ..
LBE63C , Power TOPLED with Lens Enhanced Optical Power LED (ATON)
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LBG6SP , Advanced Power TOPLED Enhanced optical Power LED
LBH1000 , 1.6×0.8×0.4 mm(L×W×H) small size surface mount type SMD
LBH1000 , 1.6×0.8×0.4 mm(L×W×H) small size surface mount type SMD
LBL293 , SmartLED® 0603 Hyper-Bright LED Lead (Pb) Free Product - RoHS Compliant
L4973D3.3-L4973D5.1-L4973V3.3-L4973V5.1
3.5A STEP DOWN SWITCHING REGULATOR
dr/r'' L4973V3.3 - L4973V5.1
s5rf',,, L4973D3.3 - L4973D5.1
3.5A STEP DOWN SWITCHING REGULATOR
n UP TO 3.5A STEP DOWN CONVERTER
n OPERATING INPUT VOLTAGE FROM 8V TO MULTIPOWER BCD TECHNOLOGY
n 3.3V AND 5.1V (i1%) FIXED OUTPUT, AND
ADJUSTABLE OUTPUTS FROM:
0.5V TO 50V 3.3V e stsiiiiiiiiiii) tii.::');,',,,;;;,;)-)
5.1V TO UN E51 tytgé’) ) 'h'i Eire-site''''
" FREQUENCY ADJUSTABLE UP TO 300KHz POWERDIP (12+3+3) 3020(12+4+4)
'' VOLTAGE FEED FORWARD
. ZERO LOAD CURRENT OPERATION (min 03353 Pumsggis:
1mA) . ower p
" INTERNAL CURRENT LIMITING (PULSE BY £13333 (s,oefrod2/p'))
PULSE AND HICCUP MODE) L4973D5.1 (SO20)
n PRECISE 5.1V (1.5%) REFERENCE VOLT-
AGE EXTERNALLY AVAILABLE
n INPUT/OUTPUT SYNCHRONIZATION FUNC-
n INHIBIT FOR ZERO CURRENT CONSUMP-
TION (1 00yA Typ. at Vcc = 24V) DESCRIPTION
'' 'Jgitfirli1 AGAINST FEEDBACK DIS- The L4973 is a step down monolithic power
switching regulator delivering 3.5A at fixed volt-
. THERMAL SHUTDOWN ages of 3.3V or 5.1V and using a simple external
n OUTPUT OVERVOLTAGE PROTECTION divider output adjustable voltage up to 50V.
I SOFT START FUNCTION Realized in BCD mixed technology, the device
TYPICAL APPLICATION CIRCUIT (POWERDIP)
Vcc (8V to 55V) i
12 CBOOT
Rosc 9 I--
L4973 Vo(3.3V or 5.1V)
CIN =,' :02 4,5,6,10 2
13,14,15 16 17 11
- Cosc 'is' %Css E D1 = COUT
D97IN554A
September 2001 1/16
L4973V3.3 - L4973V5.1 - L4973D3.3 - L4973D5.1
uses an internal power D-MOS transistor (with a
typical Rdson of 0.150hm) to obtain very high "
ciency 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 con-
PIN CONNECTIONS (Top view)
verter 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 consump-
tion 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.
OSC E 1 18 Cl SYNC OSC CE 1 V 20 ID SYNC
OUTE2 17:ISS OUTCE2 193385
OUT C 3 16 Cl V5.1 OUT CE 3 18 CIC) v5.1
GND [2 4 15 Cl GND GND cr 4 17 I] GND
GND E 5 14 Cl GND GND g 5 16 'ff, GND
GND 6 15 GND
GND l2 6 13 Cl GND
GND CE 7 14 33 GND
Vcc E 7 12 Cl VFB Vcc CE 8 13 I] VFB
Vcc l: 8 11 Cl COMP Vcc CE 9 12 ID COMP
BOOT E 9 10 Cl INH BOOT CE 10 11 I] INH
DMIN162A 094/N163A
POWERDIP (12+3+3) SO20 (12+4+4)
BLOCK DIAGRAM
INH v5.1 Vcc Vcc
10(11) 16(18) 7(8) I 8(9)
CHARGE
ZEROCURRENT VREF INTERNAL
INHIBIT GOOD INTERNAL - SUPPLY -o5.IV
5.1V o- REFERENCE
ss 17(19) SOFT HICCUP CURRENT
START LIMITING
COMP ( ) I
THERMAL CURRENT
SHUTDOWN LIMITING
5.1V - ) BOOT
3.3V + R Q 9(10)
VFB (%—> S Q
1l111L E
SYNC t OSCILLATOR
18(20)
DRIVER
4,5,6,13,14,15 [l"
1(1) (4,5,6,7,14,15,16,17) 2(2) 3(3)
osc GND dh OUT 094mm
Pin x = Powerdip
Pin(x)=S020
