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參數(shù)資料
| 型號： | MAX1577YETA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.2A White LED Regulating Charge Pump for Camera Flashes and Movie Lights |
| 中文描述： | SWITCHED CAPACITOR REGULATOR, 1250 kHz SWITCHING FREQ-MAX, DSO8 |
| 封裝： | 3 X 3 MM, 0.8 MM HEIGHT, MO-229, TDFN-8 |
| 文件頁數(shù)： | 8/11頁 |
| 文件大?。?/td> | 664K |
| 代理商： | MAX1577YETA |
M
1.2A White LED Regulating Charge Pump for
Camera Flashes and Movie Lights
8
_______________________________________________________________________________________
Detailed Description
1x LDO to 2x Mode Switchover
When V
IN
is greater than V
OUT
, the MAX1577Y/
MAX1577Z are in 1x LDO mode and regulate the cur-
rent through R
CS
. As V
IN
decreases and the LDO
approaches dropout, the 2x charge pump starts boosting
the output to maintain the regulation current. When V
IN
rises enough above V
OUT
to maintain LDO regulation, the
charge pump stops and the MAX1577Y/MAX1577Z
switch back to the more efficient 1x LDO mode.
Soft-Start
The MAX1577Y/MAX1577Z include soft-start circuitry to
limit inrush current at turn-on. When starting up with an
output voltage that is not near the input voltage, the out-
put capacitor is charged directly from the input with a
ramped current source (with no charge-pump action)
until the output voltage approaches the input voltage. If
current-mode or voltage-mode regulation is met, soft-
start is terminated and normal operation begins in 1x
mode. Otherwise, after 500μs, the 2x charge-pump soft-
start operates until the voltage across the sense resistor
reaches the current regulation threshold, the output volt-
age is in regulation, or 500μs has elapsed, whichever
occurs first. If the output is shorted to ground, soft-start
is repeated until the output exceeds 2.3V.
Dimming and Shutdown
The MAX1577Y/MAX1577Z use two inputs (EN1 and
EN2) to select between three brightness levels and low-
power shutdown mode (see Table 1). By regulating the
voltage across the current-sense resistor (V
OUT
- V
CS
) to
one of three levels, the MAX1577Y/MAX1577Z control the
output current, thus providing the three-level dimming. In
shutdown mode, the IC is turned off, reducing the supply
current to 0.01μA (typ). When the MAX1577Y/MAX1577Z
are shut down, C1 is discharged and the output is pulled
to GND through an internal 5k
resistor.
Figure 4. Flash and Backlighting with the MAX1577Y
MAX1577Y
C1
2.2
μ
F*
UP TO 1.2A
5.1V, 4.6V, OR 3.4V
V
OUT
- (300 OR
100 OR 60mV)
CAMERA-FLASH
MOVIE LIGHT
MAIN DISPLAY
BACKLIGHT
5.3V OVP
2.7V TO 5.5V
C
IN
4.7
μ
F
C
IN
10
μ
F
R
CS
5.1V OR 100% CURRENT,
4.6V OR 33% CURRENT,
3.4V OR 20% CURRENT,
AND SHUTDOWN
CP
CN
EN1
IN
OUT
CS
GND
EN2
RGB DRIVER
ASIC
SUBDISPLAY
BACKLIGHT
*1
μ
F FOR LESS THAN 600mA OUTPUT.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1577YETA+ | 制造商:Maxim Integrated Products 功能描述:CHG PUMP STPUP/STPDN 3.4V/4.6V/5.1V 1200MA 8TDFN EP - Rail/Tube |
| MAX1577YETA+T | 功能描述:LED照明驅(qū)動器 1.2A White LED Charge Pump 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 |
| MAX1577YETA-T | 功能描述:LED照明驅(qū)動器 1.2A White LED Charge Pump 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 |
| MAX1577ZETA | 制造商:Maxim Integrated Products 功能描述:1.1A WHITE LED REGULATING CHARGE PUMP FOR CAM - Bulk |
| MAX1577ZETA+ | 制造商:Maxim Integrated Products 功能描述:CHG PUMP STPUP/STPDN 5.1V 1200MA 8TDFN EP - Rail/Tube |
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