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What is L5973ADTR?

This electronic component, produced by the manufacturer "STMicroelectronics", performs the same function as "2A SWITCH STEP DOWN SWITCHING REGULATOR".


L5973ADTR Datasheet PDF - STMicroelectronics

Part Number L5973ADTR
Description 2A SWITCH STEP DOWN SWITCHING REGULATOR
Manufacturers STMicroelectronics 
Logo STMicroelectronics Logo 


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L5973AD
2A SWITCH STEP DOWN SWITCHING REGULATOR
1 GENERAL FEATURES
2A INTERNAL SWITCH
OPERATING INPUT VOLTAGE FROM 4.4V TO 36V
3.3V / (±2%) REFERENCE VOLTAGE
OUTPUT VOLTAGE ADJUSTABLE FROM
1.235V TO 35V
LOW DROPOUT OPERATION: 100% DUTY
CYCLE
500KHz INTERNALLY FIXED FREQUENCY
VOLTAGE FEEDFORWARD
ZERO LOAD CURRENT OPERATION
INTERNAL CURRENT LIMITING
INHIBIT FOR ZERO CURRENT
CONSUMPTION
SYNCHRONIZATION
PROTECTION AGAINST FEEDBACK
DISCONNECTION
THERMAL SHUTDOWN
1.1 APPLICATIONS:
CONSUMER: STB, DVD, TV, VCR,CAR
RADIO, LCD MONITORS
NETWORKING: XDSL, MODEMS,DC-DC
MODULES
COMPUTER: PRINTERS, AUDIO/GRAPHIC
CARDS, OPTICAL STORAGE, HARD DISK
DRIVE
INDUSTRIAL: CHARGERS, CAR BATTERY
DC-DC CONVERTERS
2 DESCRIPTION
The L5973AD is a step down monolithic power
Figure 1. Package
HSOP8 (Exposed pad)
Table 1. Order Codes
Part Number
L5973AD
L5973ADTR
Package
HSOP8
HSOP8 in Tape & Reel
switching regulator with a switch current limit of 2A so
it is able to deliver more than 1.5A DC current to the
load depending on the application conditions.
The output voltage can be set from 1.235V to 35V.
The high current level is also achieved thanks to an
SO8 package with exposed frame, that allows to re-
duce the Rth(j-amb) down to approximately 40°C/W
The device uses an internal P-Channel D-MOS tran-
sistor (with a typical of 200m) as switching element
to avoid the use of bootstrap capacitor and guarantee
high efficiency.
An internal oscillator fixes the switching frequency at
500KHz to minimize the size of external components.
Having a minimum input voltage of 4.4V only, it is
particularly suitable for 5V bus, available in all com-
puter related applications.
Pulse by pulse current limit with the internal frequen-
cy modulation offers an effective constant current
short circuit protection.
Figure 2. Test and Application Circuit
VREF
3.3V
6
1
VIN = 4.4V to 35V
VCC
8 L5973AD
SYNC. 2
C1
10µF
35V
CERAMIC
COMP
C4
22nF
43
INH
C3
220pF
R3
4.7K
5
7
GND
OUT
FB
L1 15µH
D1
STPS340U
VOUT=3.3V
R1
5.6K
R2
3.3K
C2
330µF
10V
December 2004
D03IN1453
Rev. 3
1/14

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L5973ADTR equivalent
L5973AD
3.2 VOLTAGES MONITOR
An internal block senses continuously the Vcc, Vref and Vbg. If the voltages go higher than their thresholds, the
regulator starts to work. There is also an hysteresis on the VCC (UVLO).
Figure 5. Internal Regulator Circuit
VCC
STARTER
D00IN1126
IC BIAS
PREREGULATOR
VREG
BANDGAP
VREF
3.3 OSCILLATOR & SYNCHRONIZATOR
Figure 6 shows the block diagram of the oscillator circuit.
The Clock Generator provides the switching frequency of the device that is internally fixed at 500KHz. The frequency
shifter block acts reducing the switching frequency in case of strong overcurrent or short circuit. The clock signal is
then used in the internal logic circuitry and is the input of the Ramp Generator and Synchronizator blocks.
The Ramp Generator circuit provides the sawtooth signal, used to realize the PWM control and the internal volt-
age feed forward, while the Synchronizator circuit generates the synchronization signal. Infact the device has a
synchronization pin that can works both as Master and Slave.
As Master to synchronize external devices to the internal switching frequency.
As Slave to synchronize itself by external signal.
In particular, connecting together two devices, the one with the lower switching frequency works as Slave and
the other one works as Master.
To synchronize the device, the SYNC pin has to pass from a low level to a level higher than the synchronization
threshold with a duty cycle that can vary approximately from 10% to 90%, depending also on the signal frequen-
cy and amplitude.
The frequency of the synchronization signal must be at least higher than the internal switching frequency of the
device (500KHz).
5/14


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Part NumberDescriptionMFRS
L5973ADTRThe function is 2A SWITCH STEP DOWN SWITCHING REGULATOR. STMicroelectronicsSTMicroelectronics

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