L5973D

Output Power :
Mounting Style : SMD/SMT
Packaging : Tube
Operating Temperature Range : - 40 C to + 150 C
Output Current : 2.5 A
Output Voltage : 35 V
Input Voltage : 4 V to 36 V
Switching Frequency : 212 KHz to 280 KHz
Package / Case : HSOP-8


Features:

·2.5A INTERNAL SWITCH
·OPERATING INPUT VOLTAGE FROM 4.4V TO 36V
·3.3V / (± 2%) REFERENCE VOLTAGE
·OUTPUT VOLTAGE ADJUSTABLE FROM1.2 5V TO 35V
· LOW DROPOUT OPERATION: 100% DUTY CYCLE
·250KHz INTERNALLY FIXED FREQUENCY
·VOLTAGE FEEDFORWARD
·ZERO LOAD CURRENT OPERATION
·INTERNAL CURRENT LIMITING
·INHIBIT FOR ZERO CURRENT CONSUMPTION
·SYNCHRONIZATION
·PROTECTION AGAINST FEEDBACK DISCONNECTION
·THERMAL SHUTDOWN




Application

·CONSUMER: STB, DVD, TV, VCR,CAR RADIO, LCD MONITORS
·NETWORKING: XDSL, MODEMS,DC-DC MODULES
·COMPUTER: PRINTERS, AUDIO/GRAPHIC ARDS, OPTICAL STORAGE, HARD DISK DRIVE
·INDUSTRIAL: CHARGERS, CAR BATTERY DC-DC CONVERTERS




Pinout






Specifications

Symbol	Parameter	Value	Unit
V8	Input Voltage	40	V
V1	Output DC voltage Output peak voltage at t = 0.1s	-1 to 40 -5 to 40	V V
I1	Maximum output current	int. limit.
V4,V5	Analog pins	4	V
V3	INH	-0.3V to VCC
V2	SYNC	-0.3 to 4	V
Ptot	Power dissipation at Tamb 60	2.25	W
Tj	Operating junction temperature range	-40 to 150
Tstg	Storage temperature range	-55 to 150

Description

The L5973D is a step down monolithic power switch- ng regulator with a minimum switch current limit of .5A so L5973D  is able to deliver more than 2A DC current o the load depending on the application conditions. he output voltage can be set from 1.235V to 35V. The high current level is also achieved thanks to an O8 package with exposed frame, that allows to re- uce the down to approximately 40 / h(R_j-amb)

L5973D  uses an internal P-Channel D-MOS tran- s switching istor (with a typical Rdson of 250m) element to minimize the size of the external compo- ents. n internal oscillator fixes the switching frequency at 50KHz.

Having a minimum input voltage of 4.4V only, it is articularly suitable for 5V bus, available in all com- uter related applications.

Pulse by pulse current limit with the internal frequen- y modulation offers an effective constant current hort circuit protection.

Parameters:

Technical/Catalog Information	L5973D
Vendor	STMicroelectronics
Category	Integrated Circuits (ICs)
Type	Step-Down (Buck)
Number of Outputs	1
Voltage - Input	4 ~ 36 V
Voltage - Output	1.24 ~ 35 V
Current - Output	2.5A
Power - Output	2.25W
Package / Case	8-SOIC (3.9mm Width) Exposed Pad, 8-eSOIC. 8-HSOIC
Packaging	Tube
Internal Switch(s)	Yes
Synchronous	Yes
Rds (On)	250 mOhm
Operating Temperature	-40°C ~ 150°C
Frequency - Switching	250kHz
Drawing Number	*
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	L5973D L5973D