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参数资料
| 型号： | LTC3217EUD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR FLASH TORCH 16QFN |
| 标准包装： | 121 |
| 拓扑： | PWM，升压（升压），切换式电容器（充电泵） |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 闪灯/白光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 600kHz ~ 1.15MHz |
| 电源电压： | 2.9 V ~ 4.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN-EP（3x3） |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 85°C |
LTC3217
OPERATION
–
+
R OL
1.5V BAT OR 2V BAT
+
CPO
Shutdown Current
In shutdown mode all the circuitry is turned off and the
LTC3217 draws a very low current from the V BAT sup-
–
3217 F01
Figure 1. Equivalent Open-Loop Circuit
V CPO in calculating Equations 2 and 3 is the minimum re-
quired voltage for the LED and not the regulated voltage.
Typical values of R OL as a function of temperature are
shown in Figures 2 and 3.
ply. Furthermore, CPO is weakly connected to V BAT . The
LTC3217 enters shutdown mode when both the EN1 and
EN2 pins are brought low. EN1 and EN2 have 250k pull-
down resistors to ground.
Thermal Protection
The LTC3217 has built-in overtemperature protection.
At internal die temperatures of around 150°C thermal
shutdown will occur. This will disable all of the current
sources and charge pump until the die has cooled by
3.2
3.0
2.8
2.6
2.4
V BAT = 3V
V CPO = 4.2V
C2 = C3 = C4 = 2.2μF
about 15°C. This thermal cycling will continue until the
fault has been corrected.
CPO Short-Circuit Protection
The LTC3217 has internal CPO short-circuit protection.
An internal comparator senses when CPO is below 0.8V
which forces the part into shutdown. A pull-up device
ensures start-up.
2.2
2.0
Mode Switching
–40
–15
10 35
TEMPERATURE (°C)
60
85
The LTC3217 will automatically switch from 1x mode
3217 F02
Figure 2. 1.5x Mode Charge Pump Open-Loop Output
Resistance vs Temperature (1.5V BAT – V CPO )/I CPO
to 1.5x mode and subsequently to 2x mode whenever a
dropout condition is detected at an LED pin. Dropout oc-
curs when a current source voltage becomes too low for
the programmed current to be supplied. The time from
3.8
3.6
3.4
3.2
3.0
2.8
2.6
V BAT = 3V
V CPO = 4.8V
C2 = C3 = C4 = 2.2μF
dropout detection and mode switching is about 2.5ms. This
delay allows for the LED to warm up and reduce its forward
voltage which may remove the dropout condition.
If PWM is used on the EN2 pin, then the dropout time is
dependent on one to two PWM clock pulses.
The part is reset back to 1x mode when the part is shut
down (EN1 = EN2 = Low). The part may be set to the
desired output current level via EN1 and EN2. An internal
comparator will not allow the main switches to connect
–40
–15
10 35
TEMPERATURE (°C)
60
85
3217 F03
V BAT and CPO in 1x mode until the voltage at the CPO
pin has decayed to less than or equal to the voltage at
Figure 3. 2x Mode Charge Pump Open-Loop Output
the V BAT pin.
Resistance vs Temperature (2V BAT – V CPO )/I CPO
3217fa
8
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