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| 型号： | LP5521YQX/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 5/44页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER RGB 24-LLP |
| 标准包装： | 4,500 |
| 系列： | PowerWise® |
| 恒定电流： | 是 |
| 拓扑： | PWM，切换式电容器（充电泵） |
| 输出数： | 3 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，照明管理装置（LMU） |
| 类型 - 次要： | RGB |
| 频率： | 1.25MHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 输出电压： | 4.55V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-LLP |
| 包装： | 带卷 (TR) |
| 工作温度： | -30°C ~ 85°C |
| 其它名称： | LP5521YQX |
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SNVS441F – JANUARY 2007 – REVISED FEBRUAY 2013
ELECTRICAL CHARACTERISTICS (1) (2)
Limits in standard typeface are for T J = 25°C. Limits in boldface type apply over the operating ambient temperature range (-
30°C < T A < +85°C). Unless otherwise noted, specifications apply to the LP5521 Block Diagram with: 2.7V ≤ V DD ≤ 5.5V,
C OUT = C IN = 1 μ F, C FLY1 = C FLY2 = 0.47 μ F. (3)
Symbol
I VDD
Parameter
Standby supply current
Condition
EN = 0 (pin), CHIP_EN = 0 (bit), external 32 kHz clock running
Min
Typ
0.2
Max
2
Units
μ A
or not running
EN = 1 (pin), CHIP_EN = 0 (bit), external 32 kHz clock not
running
EN = 1 (pin), CHIP_EN = 0 (bit), external 32 kHz clock running
1.0
1.4
μ A
μ A
Normal mode supply
current
Powersave mode supply
current
Charge pump and LED drivers disabled
Charge pump in 1x mode, no load, LED drivers disabled
Charge pump in 1.5x mode, no load, LED drivers disabled
Charge pump in 1x mode, no load, LED drivers enabled
External 32 kHz clock running
Internal oscillator running
0.25
0.70
1.5
1.2
10
0.25
mA
mA
mA
mA
μ A
mA
f OSC
Internal oscillator
frequency accuracy
-4
-7
4
7
%
(1)
(2)
(3)
All voltages are with respect to the potential at the GND pins.
Min and Max limits are specified by design, test, or statistical analysis.
Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics.
CHARGE PUMP ELECTRICAL CHARACTERISTICS (1)
Symbol
R OUT
Parameter
Charge pump output resistance
Gain = 1.5x
Condition
Min
Typ
3.5
Max
Units
?
Gain = 1x
1
?
f SW
Switching frequency
-7
1.25
7
MHz
%
I GND
t ON
V OUT
Ground current
V OUT turn-on time from charge pump
off to 1.5x mode
Charge pump output voltage
Gain = 1.5x
Gain = 1x
V DD = 3.6V, CHIP_EN = H
I OUT = 60 mA
V DD = 3.6V, no load, Gain = 1.5x
1.2
0.5
100
4.55
mA
mA
μ s
V
(1)
Input, output, and fly capacitors should be of the type X5R or X7R low ESR ceramic capacitor.
LED DRIVER ELECTRICAL CHARACTERISTICS (R, G, B OUTPUTS)
Symbol
I LEAKAGE
Parameter
R, G, B pin leakage
Condition
Min
Typ
0.1
Max
1
Units
μA
current
I MAX
Maximum Source Current
Outputs R, G, B
25.5
mA
I OUT
Accuracy of output current Output current set to 17.5 mA, V DD
= 3.6V
-4
-5
4
5
%
I MATCH
Matching (1)
I OUT = 17.5 mA, V DD = 3.6V
1
2
%
f LED
LED PWM switching
PWM_HF = 1
frequency
Frequency defined by internal
558
Hz
oscillator
PWM_HF = 0
Frequency defined by 32 kHz clock
(internal or external)
256
Hz
V SAT
Saturation voltage (2)
I OUT set to 17.5 mA
50
100
mV
(1)
(2)
Matching is the maximum difference from the average of the three output's currents.
Saturation voltage is defined as the voltage when the LED current has dropped 10% from the value measured at V OUT - 1V.
Copyright ? 2007–2013, Texas Instruments Incorporated
Product Folder Links: LP5521
5
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