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PDF TS3553 Data sheet ( Hoja de datos )
| Número de pieza | TS3553 | |
| Descripción | 3A / 350kHz Synchronous Buck DC/DC Converter | |
| Fabricantes | Taiwan Semiconductor | |
| Logotipo |  |
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TS3553
3A/350kHz Synchronous Buck DC/DC Converter
SOP-8EP
Pin Definition:
1. BS
8. SS
2. VIN
7. EN
3. SW
6. COMP
4. GND
5. FB
General Description
The TS3553 is a synchronous step-down DC/DC converter that provides wide 4.5V to 23V input voltage range
and 3A continuous load current capability. Fault protection includes cycle-by-cycle current limit, input UVLO,
output over voltage protection and thermal shutdown. Besides, adjustable soft-start function prevents inrush
current at turn-on. This device uses current mode control scheme that provides fast transient response. In
shutdown mode, the regulator draws 1µA or less of supply current.
Features
● Operating Voltage Range 4.75V~23V
● Output load current up to 3A
● High Efficiency: Up to 95%
● Fixed Switching Frequency 350kHz
● 100mΩ Internal Power MOSFET
● Adjustable Output Voltage from 0.925~20V
● Stable with Low ESR Output Ceramic Capacitors
● Current Mode Operation
● Input Under Voltage Lockout
● Over Temperature Protection
● Cycle-by Cycle Current limit
● <1µA Shutdown Current
Ordering Information
Part No.
Package
Packing
TS3553CS RLG SOP-8EP 2.5Kpcs / 13” Reel
Note: “G” denote for Halogen Free Product
Application
● Set-Top-Box
● DVD, LCD Displays
● Netbook
● Distributed Power System
● DSL Modems
Typical Application Circuit
3.3V Output Application Circuit
1/11
Version: B11
1 page  
TS3553
3A/350kHz Synchronous Buck DC/DC Converter
Application Information
Setting Output Voltage
The output voltage is set using a resistive divider from the output to FB. The FB pin regulated voltage is 0.925V.
Thus the output voltage is:
R2 recommended value is 10KΩ~30KΩ, so R1 is determined by: R1 = 10.81 x (VOUT – 0.925) KΩ
Recommended Component Selection
VIN (V)
12
5 or 12
5 or 12
5 or 12
5 or 12
VOUT (V)
5
3.3
1.8
1.2
1
R1 (KΩ)
44.1
25.7
9.5
3
0.81
R2 (KΩ)
10
10
10
10
10
R3 (KΩ)
2.2
2.2
2.2
2.2
2.2
C3 (nF)
3.3
3.3
3.3
3.3
3.3
L1 (µH)
15
10
4.7
3.3
2.2
COUT (µF)
10 X 2
10 X 2
10 X 2
10 X 2
10 X 2
Selecting Inductor
The inductor selection depends on the current ripple of inductor, the input voltage and the output voltage.
Accepting a large current ripple of inductor allows the use of a smaller inductance. However, higher current ripple
of inductor can cause higher output ripple voltage and large core loss. By setting an acceptable current ripple of
inductor, a suitable inductance can be obtained from above formula.
In addition, it is important to ensure the inductor saturation current exceeds the peak value of inductor current in
application to prevent core saturation. The peak value of inductor current can be calculated according to the
following formula.
Soft-Start
The TS3553 provides the soft-start function. Initially, the voltage at SS pin is 0V. Then an internal current source of
6A (typ.) charges an external soft-start capacitor. During the soft-start period, the voltage at SS pin will limit the
feedback threshold voltage at FB pin. When the voltage at SS pin is higher than 0.925V, the feedback threshold
voltage at FB pin reaches the desired value. The soft-start time can be calculated in accordance with the following
formula:
The soft-start capacitor is discharged to GND when the EN pin is connected to GND
5/11 Version: B11
5 Page 
TS3553
3A/350kHz Synchronous Buck DC/DC Converter
Notice
Specifications of the products displayed herein are subject to change without notice. TSC or anyone on its behalf,
assumes no responsibility or liability for any errors or inaccuracies.
Information contained herein is intended to provide a product description only. No license, express or implied, to
any intellectual property rights is granted by this document. Except as provided in TSC’s terms and conditions of
sale for such products, TSC assumes no liability whatsoever, and disclaims any express or implied warranty,
relating to sale and/or use of TSC products including liability or warranties relating to fitness for a particular purpose,
merchantability, or infringement of any patent, copyright, or other intellectual property right.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications.
Customers using or selling these products for use in such applications do so at their own risk and agree to fully
indemnify TSC for any damages resulting from such improper use or sale.
11/11
Version: B11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet TS3553.PDF ] | |
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