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參數(shù)資料
| 型號： | LP55271TL |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization |
| 中文描述： | LED DISPLAY DRIVER, PBGA30 |
| 封裝： | 2.5 X 3 MM, 0.60 MM HEIGHT, BGA-30 |
| 文件頁數(shù)： | 8/21頁 |
| 文件大小： | 826K |
| 代理商： | LP55271TL |
Magnetic Boost DC/DC Converter
(Continued)
MAGNETIC BOOST DC/DC CONVERTER ELECTRICAL CHARACTERISTICS
Limits in standard typeface are for T
= 25
o
C. Limits in
boldface
type apply over the operating ambient temperature
range (-30
o
C
<
T
<
+85
o
C). Unless otherwise noted, specifications apply to the LP55271 Block Diagram with: V
=
3.6V, C
= 10 μF, C
= 10 μF, C
= 10 μF, C
VDDIO
= 100 nF, C
VREF
= 100 nF, C
VDDA
= 4.7 μF, C
VDD1
= 100 nF,
C
VDD2
= 100 nF, L
1
= 4.7 μH. (Note 9)
Symbol
Parameter
Conditions
I
LOAD
Load Current
(Note 10)
V
OUT
= 5.0V
V
OUT
Output Voltage Accuracy
(FB pin)
V
OUT
(target value) = 5.0V,
active load off
Output Voltage
(FB Pin)
active load off
V
IN
>
(5.0V + V
SCHOTTKY
)
RDS
ON
Switch ON Resistance
V
IN
= 3.6V, I
SW
= 1.0A
f
PWF
PWM Mode Switching
Frequency
FREQ_SEL (bit) = 1
FREQ_SEL (bit) = 0
Frequency Accuracy
3.2V
≤
V
DD1,2
≤
5.0V
RT = 82 k
t
PULSE
Switch Pulse Minimum
Width
t
STARTUP
Startup Time
I
CL_OUT
SW1 + SW2 current limit
Min
Typ
Max
670
Units
mA
3.2V
≤
V
IN
≤
4.5V
3.2V
≤
V
IN
≤
4.5V
5
+5
%
3.0V
≤
V
IN
≤
(5.0V+V
SCHOTTKY
)
5.0
V
V
IN
- V
SCHOTTKY
0.20
0.4
MHz
RT = 82 k
2.0
1.0
±
3
6
-9
+6
+9
%
no load
25
ns
10
1.7
ms
A
Note 10:
Specified currents are the worst case currents. If input voltage is larger or output voltage is smaller, current can be increased according to graph "Boost
Maximum Output Current".
BOOST STANDBY MODE
User can set the boost converter to STANDBY mode by
writing the register bit EN_BOOST low when there is no load
to avoid idle current consumption. When EN_BOOST is
written high, the converter starts in low current PWM (Pulse
Width Modulation) mode for 10 ms and then goes to normal
PWM mode.
BOOST CONTROL REGISTERS
User can control the boost output voltage and the switching
frequency according to the following tables.
Boost Output Voltage
[3:0] Register
0000
0001
0011
0111
1000
1001
1011
1111
Boost Output Voltage (V)
(Typical)
4.00
4.20
4.40
4.60 default
4.80
5.00
5.20
5.40
FREQ_SEL Bit
Boost Switching
Frequency
(Typical)
1.0 MHz default
2.0 MHz
0
1
L
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP55271TL/NOPB | 功能描述:LED照明驅(qū)動器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| LP55271TLX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Tiny LED Driver for Camera Flash and 4 LEDs with I2C Programmability, Connectivity Test and Audio Synchronization |
| LP55271TLX/NOPB | 功能描述:LED照明驅(qū)動器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
| LP5527TL | 制造商:Texas Instruments 功能描述:DRIVER FLASH LED I2C POWERWISE |
| LP5527TL/NOPB | 功能描述:LED照明驅(qū)動器 RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
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