L5973D STMicroelectronics, L5973D Datasheet

IC REG SWITCHING STEPDOWN SOIC-8

L5973D

Manufacturer Part Number
L5973D
Description
IC REG SWITCHING STEPDOWN SOIC-8
Manufacturer
STMicroelectronics
Type
Step-Down (Buck)r
Datasheets

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

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Features
Applications
Figure 1.
January 2008
2.5 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
250 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: changers, car battery, DC-DC
converters
CERAMIC
Test application circuit
VIN = 4.4V to 35V
10µF
35V
C1
220pF
3.3V
22nF
C4
C3
SYNC.
COMP
VREF
VCC
4.7K
R3
2.5 A switch step down switching regulator
6
8
2
4
INH
L5973D
3
Rev 16
7
GND
Description
The L5973D is a step down monolithic power
switching regulator with a minimum switch current
limit of 2.5 A so it is able to deliver more than 2 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 Rth(j-amb) down to
approximately 40 °C/W.
The device uses an internal P-channel D-MOS
transistor (with a typical Rdson of 250 mΩ) as
switching element to minimize the size of the
external components.
An internal oscillator fixes the switching frequency
at 250 kHz.
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.
D03IN1439
1
5
OUT
FB
STPS340U
L1 15µH
HSOP8 exposed pad
D1
5.6K
3.3K
R1
R2
VOUT=3.3V
330µF
10V
L5973D
C2
www.st.com
1/17
17

Related parts for L5973D

L5973D Summary of contents

Page 1

... C3 220pF January 2008 2.5 A switch step down switching regulator Description The L5973D is a step down monolithic power switching regulator with a minimum switch current limit of 2 able to deliver more than current to the load depending on the application conditions. The output voltage can be set from 1.235 ...

Page 2

... Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 5 Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 Application ideas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 8 Order code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2/17 L5973D ...

Page 3

... L5973D 1 Pin settings 1.1 Pin connection Figure 2. Pin connection (top view) 1.2 Pin description Table 1. Pin description N° Type 1 OUT 2 SYNC 3 INH 4 COMP VREF 7 GND 8 VCC OUT 1 8 SYNC 2 7 INH 3 6 COMP 4 5 D98IN955 Regulator output. Master/slave synchronization. A logical signal (active high) disables the device. If INH not used the pin must be grounded ...

Page 4

... T Operating junction temperature range J T Storage temperature range STG 2.2 Thermal data Table 3. Thermal data Symbol R Maximum thermal resistance junction-ambient thJA 1. Package mounted on board 4/17 Parameter ≤ 60 °C A Parameter L5973D Value Unit int. limit -0 -0 2.25 W -40 to 150 °C -55 to 150 ° ...

Page 5

... L5973D 3 Electrical characteristics Table 4. Electrical characteristics ( ° Symbol Operating input V CC voltage range Mosfet on R DS(on) Resistance Maximum limiting I l current f Switching frequency s Duty cycle Dynamic characteristics (see test circuit ). V Voltage feedback 5 h Efficiency DC characteristics Total operating I qop quiescent current I Quiescent current ...

Page 6

... V = 0.74 V sync V = 2.33 V sync source no load 1.65 V sync REF REF REF from -40 to 125 °C. Specification over the -40 to +125 T J L5973D Min Typ Max Unit µA 2 2 REF 0.74 V 0.11 0.25 mA 0.21 0. µs 0.20 0.35 3 ...

Page 7

... L5973D 4 Typical characteristics Figure 3. Line regulation Vo (V) 3.312 Vcc = 12V 3.308 Vo = 3.3V 3.304 3.3 3.296 3.292 3.288 3.284 3.28 3.276 0 10 Figure 5. Output voltage vs junction temperature Vo (V) 1.25 1.24 1.23 1.22 1.21 1.2 -50 0 Figure 7. Quiescent current vs junction temperature Iq (mA) 2 1.8 1 ...

Page 8

... Figure 11. Efficiency vs output current 91 89 Vo=3. 0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 Io (A) Junction temperature vs output current Vo=5V Vin=12V Tamb=25°C 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 Io (A) Vo=5V Vo=3.3V Vo=2.5V Vin=12V Io (A) L5973D Vo=3.3V Vo=2.5V ...

Page 9

... VIN = 4.4V to 25V C1 10µF 25V CERAMIC Table 5. Component list Reference VREF 3.3V 6 VCC 8 L5973D SYNC. 2 COMP INH GND 22nF C3 R3 220pF 4.7K Part number GRM32DR61E106KA12L POSCAP 6TPB330M C1206C221J5GAC 220 pF, 5 C1206C223K5RAC 22 nF, 10 5.6 K, 1%, 0.1 W 0603 3.3 K, 1%, 0.1 W 0603 4 ...

Page 10

... Application circuit Figure 13. PCB layout (component side) Figure 14. PCB layout (bottom side) Figure 15. PCB layout (front side) Below some graphs show the T output voltage and some efficiency measurements. 10/17 versus output current in different conditions of the input and J L5973D ...

Page 11

... L5973D 6 Application ideas Figure 16. Positive buck-boost regulator Figure 17. Buck-boost regulator Figure 18. Dual output voltage with auxiliary winding Application ideas 11/17 ...

Page 12

... The value of this resistor has to be calculated taking into account that the current flowing through this resistance has to be higher than the current flowing through R Figure 19. Output voltage below the 1.235 V internal voltage reference 12/ )x increases. OUT L5973D and GND is required in order OUT . 2 ...

Page 13

... L5973D 7 Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a Lead-free second level interconnect . The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label ...

Page 14

... L5973D inch Min Typ Max 0.0669 0.00 0.0039 0.0492 0.0122 0.0201 0.0067 0.0098 0.1890 0.1929 0.1969 0.118 0.122 0.126 0.2283 ...

Page 15

... L5973D 8 Order code Table 7. Order code Part number L5973D L5973D013TR Package HSOP8 (Exposed pad) HSOP8 (Exposed pad) Order code Packaging Tube Tape and reel 15/17 ...

Page 16

... Revision 10 Updated package information Electrical characteristic 11 Figure 19 added, new template 12 Typo in order codes 13 Updated Table 4 on page 5 14 Updated Section 5: Application circuit on page 9 15 Updated Table 6 on page 14 16 Updated Table 6 on page 14 Changes Table 4 updated, new application idea L5973D ...

Page 17

... L5973D Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. ...

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