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参数资料
| 型号： | LTC3217EUD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/12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
ELECTRICAL CHARACTERISTICS The l denotes the speci?cations which apply over the full operating
temperature range, otherwise speci?cations are at T A = 25°C. V BAT = 3.6V, C1 = C2 = C3 = C4 = 2.2μF, unless otherwise noted.
CPO Short Circuit Detection
Threshold Voltage
●
0.4
1.3
V
Test Current
CPO = 0V, EN1 = EN2 = Low
●
10
30
mA
Unused LED Detection
Threshold Voltage
Test Current
V CPO – LED
LED Tied to CPO
●
●
0.5
4
1.5
16
V
μA
EN1, EN2
Low Level Input Voltage (V IL )
High Level Input Voltage (V IH )
●
●
1.4
0.4
V
V
Input Current (I IH )
Input Current (I IL )
●
●
7
–1
30
1
μA
μA
Minimum PWM On-Time
Maximum PWM Off-Time
EN2 Only
EN2 to Remain Enabled, EN1 = Low
●
●
50
1
μs
ms
I SET1 , I SET2
V ISET1 , ISET2
I ISET1 , ISET2 Current Range
I LED1-4 = 12.5mA
●
●
1.175
31.25
1.215
1.255
375
V
μA
I ISET1 , ISET2 Short-Circuit Current
800
μA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Based on charge pump long-term current density limitations.
Assumes an operating duty cycle of ≤10% under absolute maximum
conditions for durations less than 10 seconds. Maximum current for
continuous operation is 300mA.
Note 3: Based on LED current source long-term current density
limitations. Assumes an operating duty cycle of ≤10% under absolute
maximum conditions for durations less than 10 seconds. Maximum
current for continuous operation is 100mA.
Note 4: The LTC3217E is guaranteed to meet performance speci?cations
from 0°C to 85°C. Speci?cations over the –40°C to 85°C ambient
operating temperature range are assured by design, characterization and
correlation with statistical process controls.
Note 5: 1.5x mode output impedance is de?ned as (1.5V BAT – V CPO )/I OUT .
2x mode output impedance is de?ned as (2V BAT – V CPO )/I OUT .
TYPICAL PERFORMANCE CHARACTERISTICS
T A = 25°C unless otherwise noted.
LED Dropout Voltage
LED Pin Current
vs LED Current
vs LED Pin Voltage
I LED vs R ISET
400
V BAT = 3.6V
120
V BAT = 3.6V
120
300
100
80
100
80
200
100
60
40
20
60
40
20
0
10 20
30
40 50
60 70 80
90 100
0
0
0.2
0.4 0.6 0.8
1.0
0
0
5
10 15 20 25 30 35 40 45 50
LED CURRENT (mA)
3217 G01
LED PIN VOLTAGE (V)
3217 G02
R ISET (kΩ)
3217 G03
3217fa
3
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