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STW41416 датащи(PDF) 2 Page - STMicroelectronics

номер детали STW41416
подробное описание детали  Single-coil dual-output step-down DC/DC converter for digital base band and multimedia processor supply
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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STW41416 датащи(HTML) 2 Page - STMicroelectronics

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Contents
STw4141
2/30
Contents
1
STw4141 pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3
DC electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.4
Dynamic electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.5
Soft start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.6
Settling time of VOUT2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.7
Line transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.8
Load transients in AUTO mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.9
Load transients in PWM mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2.10
Switching between PFM and PWM in FORCED mode . . . . . . . . . . . . . . 14
2.11
Efficiency in PWM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.12
Efficiency in AUTO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2.13
Output voltages versus output currents in PWM and PFM . . . . . . . . . . . . 17
3
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
PWM and PFM mode operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Current limiter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Short circuit protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Thermal shutdown protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1
User mode details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.2
Automatic PWM/PFM mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.3
User selected PWM/PFM mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.4
External clock synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.5
Checking transient response versus external components . . . . . . . . . . . 21
4.6
Bill of Material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.6.1
Inductor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21


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