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參數(shù)資料
| 型號： | ST5R28 |
| 英文描述： | SMD-IC,DGTL,EPLD,10K GATE W/BST,VOUT=3.3 |
| 中文描述： | 微功耗VFM的STPE型DC / DC變換器 |
| 文件頁數(shù)： | 2/15頁 |
| 文件大?。?/td> | 553K |
| 代理商： | ST5R28 |
ST5R00 SERIES
2/15
ABSOLUTE MAXIMUM RATINGS
(*) Reduced by 1.7 mW for increasing in T
of 1°C over 25°C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.
THERMAL DATA
OPERATION
The ST5Rxx architecture is built around a VFM CONTROL logic core: switching frequency is set through
a built in oscillator: T
ON
time is fixed (Typ. 5ms) while T
OFF
time is determined by the error amplifier
output, a logic signal coming from the comparison made by the Error Amplifier Stage between the signal
coming from the output voltage divider network and the internal Band-Gap voltage reference (V
ref
). T
OFF
reaches a minimum (Typ. 1.7ms) when heavy load conditions are met (Clock frequency 150KHz). An over
current conditions, through the internal power switch, causes a voltage drop V
LX
=R
DSON
xI
SW
and the V
LX
limiter block forces the internal switch to be off, so narrowing T
ON
time and limiting internal power
dissipation. In this case the switching frequency may be higher than the 150KHz set by the internal clock
generator.
VFM control ensures very low quiescent current and high conversion efficiency even with very light loads.
Since the Output Voltage pin is also used as the device Supply Voltage, the versions with higher output
voltage present an higher internal supply voltage that results in lower power switch R
DSON
, slightly greater
output power and higher efficiency. Moreover, bootstrapping allows the input voltage to sag to 0.6V (at
I
OUT
=1mA) once the system is started.
If the input voltage exceeds the output voltage, the output will follow the input, however, the input or output
voltage must not be forced above 5.5V.
Typical Application Circuit
(*) See application info.
Typical Application Efficiency
Symbol
Parameter
Value
Unit
V
OUT
V
IN
V
LX
I
LX
P
TOT
T
STG
T
OP
Output Voltage
Input Voltage
LX Pin Voltage
LX Pin Output Current
Power Dissipation at 25°C for SOT23-5L
Storage Temperature Range
Operating Junction Temperature Range
5.5
5.5
5.5
V
V
V
Internally limited
170 (*)
-55 to 125
-25 to 85
mW
°C
°C
Symbol
Parameter
SOT23-5L
SOT-89
Unit
R
thj-case
Thermal Resistance Junction-case
63
17
°C/W
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST5R28M | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:MICROPOWER VFM STEP-UP DC/DC CONVERTER |
| ST5R28MTR | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 2.8 Volt 100mA RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| ST5R28U | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:MICROPOWER VFM STEP-UP DC/DC CONVERTER |
| ST5R30 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MICROPOWER VFM STPE-UP DC/DC CONVERTER |
| ST5R30M | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:MICROPOWER VFM STEP-UP DC/DC CONVERTER |
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