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参数资料
型号： LTC3452EUF#TRPBF
厂商： Linear Technology
文件页数： 3/16页
文件大小： 0K
描述： IC LED DRIVER PHOTO FLASH 20-QFN
标准包装： 2,500
拓扑： PWM，降压（降压），升压（升压）
输出数： 7
内部驱动器： 是
类型 - 主要： 背光，闪灯/白光
类型 - 次要： 白色 LED
频率： 900kHz ~ 1.1MHz
电源电压： 2.7 V ~ 5.5 V
输出电压： 4.5V
安装类型： 表面贴装
封装/外壳： 20-WFQFN 裸露焊盘
供应商设备封装： 20-QFN 裸露焊盘（4x4）
包装： 带卷 (TR)
工作温度： -40°C ~ 85°C
LTC3452
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T A = 25 ° C.
V IN = PV IN = V OUT = 3.6V unless otherwise specified. (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
LED Lx Output Current Ratio (I LEDLx /I SETL )
I LEDLx|MAX = 20mA, V LEDLx = 300mV
(Note 6)
LED Lx Output Current Matching
PWM Duty Cycle = 6%
PWM Duty Cycle = 19%
PWM Duty Cycle = 31%
PWM Duty Cycle = 44%
PWM Duty Cycle = 56%
PWM Duty Cycle = 69%
PWM Duty Cycle = 81%
PWM Duty Cycle = 94%
(Max – Min)/[(Max + Min)/2] ? 100%, I LEDLx = 20mA,
●
●
●
●
●
●
●
●
1.8
1.75
3.66
3.56
7.32
7.12
14.72
14.32
29.44
28.64
58.88
57.92
117.12
114.56
234.24
229.12
2
2
4
4
8
8
16
16
32
32
64
64
128
128
256
245
2.5
2.16
2.21
4.28
4.38
8.56
8.76
17.04
17.44
33.92
34.56
67.2
68.16
134.4
137.6
268.8
272.64
8
mA/mA
mA/mA
mA/mA
mA/mA
mA/mA
mA/mA
mA/mA
mA/mA
mA/mA
mA/mA
mA/mA
mA/mA
mA/mA
mA/mA
mA/mA
mA/mA
%
V LEDLx = 300mV
LED Lx Pin Voltage
I LEDLx = 20mA
130
mV
Regulated Maximum V OUT
V LEDLx = V LEDHy = 0V
●
4.35
4.5
4.75
V
PMOS Switch R ON
NMOS Switch R ON
Switches A and D at 100mA
Switches B and C at 100mA
210
205
m ?
m ?
Forward Current Limit
Reverse Current Limit
PMOS Switch Leakage
NMOS Switch Leakage
Oscillator Frequency
Switch A
Switch D
Switches A and D
Switches B and C
1000
–1
–1
0.9
1600
200
1
2400
1
1
1.1
mA
mA
μ A
μ A
MHz
Soft-Start Time
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: The LTC3452E is guaranteed to meet specifications from 0 ° C to
70 ° C. Specifications over the –40 ° C to 85 ° C operating temperature range
are assured by design, characterization and correlation with statistical
process controls.
650
Note 3: T J is calculated from the ambient temperature T A and power
dissipation P D according to the following formula:
T J = T A + (P D ? θ JA ° C/W).
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 5: Do not exceed 50kHz PWM frequency in the application.
Note 6: This parameter is tested in a setup which forces conditions
equivalent to those programmed by the indicated duty cycle.
μ s
3452f
3
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