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参数资料
| 型号： | SC668ULTRT |
| 厂商： | Semtech |
| 文件页数： | 22/46页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR LMU 8CH MLPQUT20 |
| 特色产品： | Semtech sc667 and sc668 |
| 标准包装： | 1 |
| 拓扑： | 线性（LDO），PWM |
| 输出数： | 12 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光，LED 闪烁器，照明管理装置（LMU） |
| 频率： | 400kHz |
| 电源电压： | 2.9 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-UFQFN 裸露焊盘 |
| 供应商设备封装： | 20-MLPQ（3x3） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | SC668ULDKR |
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SC668
Applications Information (continued)
General Purpose ADC
The ADI pin may also be used for general purpose ADC
functions. For example, a linear temperature sensor may
be added to the application circuit, and the SC668 may
provide temperature data or an over-temperature warning
flag. In this case, registers 13h, 14h, and 15h can be used
to store the ADC reading and set thresholds that will
trigger and interrupt output if the reading does not remain
between them.
Programmable LDO Outputs
Four LDO (low dropout) regulators are included to supply
power to peripheral circuits. Each LDO output voltage
setting has ±3.5% accuracy over the line, load, and operat-
ing temperature ranges. Output current greater than
specification is possible at somewhat reduced accuracy
(refer to the typical characteristic section of this datasheet
for load regulation examples). LDO1, LDO3, and LDO4
have identical specifications, with a programmable output
ranging from 1.5V to 3.3V. LDO2 is specified to operate
with programmable output ranging from 1.2V to 1.8V. All
of the LDOs are low noise and can be used with noise sen-
sitive circuits.
LDO4 is internally connected to the ADC (Analog to Digital
Converter) to provide the reference voltage for the ADC.
LDO4 must be enabled for the ADC to function. When the
ALS function is used, LDO4 may also be used to provide
power to the external ALS circuit.
Protection Features
The SC668 provides OT (Over-temperature) protection
and LDO current limiting to safeguard the device from
catastrophic failures.
Over-Temperature Protection
The OT protection circuit prevents the device from over-
heating and experiencing a catastrophic failure. When the
junction temperature exceeds 165°C, the device goes into
thermal shutdown with all outputs disabled until the junc-
tion temperature is reduced. All register information is
retained during thermal shutdown. Hysteresis of 30°C is
provided to ensure that the device cools sufficiently before
re-enabling.
LDO Current Limit
The device limits current at each LDO output pin. The
typical limit is 400mA, with a minimum limit rating of
200mA. The LDOs may be used for up to 200mA without
tripping the current limit.
Thermal Management
A junction temperature calculation should be performed
for each new application design to ensure the device will
not exceed 125°C during normal operation. The first step
is to determine how much power can be dissipated by the
SC668 in the application. The following formula approxi-
mates the maximum dissipation. This formula can be used
to sum the maximum internal power dissipation required
of each LDO and each backlight sink.
Shutdown Mode
The device is disabled when the EN pin is held low for the
shutdown time specified in the electrical characteristics
P D
4
n 1
( V IN V LDOn ) I LDOn
7
m 1
V BLm I BLm
section. All registers are reset to default conditions at shut-
down. Typical current consumption in this mode is 0.1μA.
The resulting power dissipation can then be used in the
calculation for maximum junction temperature.
Sleep Mode
Sleep mode is activated when all backlights are off. This is
T J
T A
JA
P D
a reduced current mode that helps minimize overall
current consumption. In sleep mode, the I 2 C interface
continues to monitor its input for commands from the
host processor. All registers retain their settings in sleep
mode. Typical current consumption in this mode is 90μA.
where,
T A = Maximum ambient temperature rating in °C.
Q JA = Thermal resistance, from junction to ambient, equal
to 35°C/W for a optimum circuit board layout.
22
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