L5973D STMicroelectronics, L5973D Datasheet
L5973D
Manufacturer Part Number
L5973D
Description
IC REG SWITCHING STEPDOWN SOIC-8
Manufacturer
STMicroelectronics
Type
Step-Down (Buck)r
Specifications of L5973D
Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
1.24 ~ 35 V
Current - Output
2.5A
Frequency - Switching
250kHz
Voltage - Input
4 ~ 36 V
Operating Temperature
-40°C ~ 150°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width) Exposed Pad, 8-eSOIC. 8-HSOIC
Power - Output
2.25W
Output Voltage
35 V
Output Current
2.5 A
Input Voltage
4 V to 36 V
Switching Frequency
212 KHz to 280 KHz
Operating Temperature Range
- 40 C to + 150 C
Mounting Style
SMD/SMT
Duty Cycle (max)
100 %
Current, Input Bias
2.5 μA
Current, Output
300 μA
Current, Supply
2.5 mA
Frequency, Oscillator
250 kHz
Package Type
HSOP-8
Power Dissipation
2.25 W
Regulation, Line
5 mV
Regulation, Load
8 mV
Regulator Type
Low Dropout, Switching
Temperature, Operating, Range
-40 to +150 °C
Transconductance
2.3
Voltage, Gain
57 dB
Voltage, Input
36 V
Voltage, Output
35 V
Voltage, Output, High
3.5 V
Voltage, Output, Low
0.4 V
Voltage, Supply
12 V
No. Of Pins
8
Rohs Compliant
Yes
Primary Input Voltage
36V
No. Of Outputs
1
Switching Frequency Max
250kHz
Supply Voltage Max
36V
Low Dropout Operation
100 % duty cycle
For Use With
497-4134 - EVAL BOARD FOR L5973 SERIES497-4133 - EVAL BOARD FOR L5973 SERIES
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
L5973D
Manufacturer:
STMicroelectronics
Quantity:
8 617
Part Number:
L5973D
Manufacturer:
ST
Quantity:
20 000
Company:
Part Number:
L5973D013TR
Manufacturer:
EVERSPIN
Quantity:
1 001
Company:
Part Number:
L5973D013TR
Manufacturer:
st
Quantity:
200
Part Number:
L5973D013TR
Manufacturer:
ST
Quantity:
20 000
Features
■
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Applications
■
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Figure 1.
2 A Internal switch
Operating input voltage from 4 V to 36 V
3.3 V / (±2 %) reference voltage
Output voltage adjustable from 1.235 V to 35 V
Low dropout operation: 100 % duty cycle
500 kHz Internally fixed frequency
Voltage feedforward
Zero load current operation
Internal current limiting
Inhibit for zero current consumption
Synchronization
Protection against feedback disconnection
Thermal shutdown
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
CERAMIC
Test application circuit
10µF
VIN = 4V to 35V
35V
C1
220pF
3.3V
22nF
C4
C3
SYNC.
COMP
VREF
VCC
4.7K
R3
6
8
2
4
INH
2 A switch step down switching regulator
L5973AD
3
7
GND
D03IN1453
Description
The L5973AD is a step down monolithic power
switching regulator with a switch current limit of
2A so it is able to deliver more than 1.5 A DC
current to the load depending on the application
conditions.
The output voltage can be set from 1.235 V
to 35 V. The high current level is also achieved
thanks to an SO8 package with exposed frame,
that allows to reduce the R
approximately 40 °C/W.
The device uses an internal P-Channel D-MOS
transistor (with a typical of 200 mΩ) as switching
element to avoid the use of bootstrap capacitor
and guarantee high efficiency.
An internal oscillator fixes the switching frequency
at 500 kHz to minimize the size of external
components.
Having a minimum input voltage of 4 V only, it is
particularly suitable for 5 V bus, available in all
computer related applications.
Pulse by pulse current limit with the internal
frequency modulation offers an effective constant
current short circuit protection.
1
5
OUT
FB
STPS340U
L1 15µH
D1
HSOP8 exposed pad
5.6K
3.3K
R1
R2
VOUT=3.3V
thJA
330µF
10V
C2
L5973AD
down to
1/21
21
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L5973D Summary of contents
Page 1
Features ■ Internal switch ■ Operating input voltage from ■ 3 (±2 %) reference voltage ■ Output voltage adjustable from 1.235 ■ Low dropout operation: 100 % ...
Page 2
L5973AD 3 Electrical characteristics Table 4. Electrical characteristics ( ° unless otherwise specified Symbol Operating input voltage V CC range R Mosfet on Resistance DS(on) Maximum limiting I l current f ...
Page 3
Electrical characteristics Table 4. Electrical characteristics (continued ° unless otherwise specified Symbol gm Transconductance Sync function High input voltage Low input voltage Slave sink current Master output amplitude Output pulse ...
Page 4
L5973AD Table 7. HSOP8 mechanical data Dim ccc Figure 16. Package dimensions mm. Min Typ Max 1.70 0.00 0.15 1.25 0.31 0.51 0.17 0.25 4.80 4.90 ...
Page 5
Order code 8 Order code Table 8. Order code Part number L5973AD L5973ADTR 20/21 Package HSOP8 (Exposed pad) HSOP8 (Exposed pad) L5973AD Packaging Tube Tape and reel ...