參數(shù)資料
型號(hào)： SC622
廠商： Semtech Corporation
英文描述： LED Light Management Unit Charge Pump, 400mA Flash LED, Dual LDOs, and SemWireTM Interface
中文描述： LED燈管理股電荷泵，400mA的閃光LED，雙LDO，和SemWireTM接口
文件頁(yè)數(shù)： 14/21頁(yè)
文件大?。?/td> 313K
代理商： SC622
SC622
14
Applications Information (continued)
A 1μF, low ESR capacitor should be used as a bypass
capacitor on each LDO output to reduce noise and
ensure stability. In addition, it is recommended that a
minimum 22nF capacitor be connected from the BYP
pin to ground to minimize noise and achieve optimum
power supply rejection. A larger capacitor can be used
for this function, but at the expense of increasing turn-
on time. Capacitors with X7R or X5R ceramic dielectric
are strongly recommended for their low ESR and superior
temperature and voltage characteristics. Y5V capacitors
should not be used as their temperature coefficients
make them unsuitable for this application.
Shutdown State
The device is disabled when the SWIF pin is low. All
registers are reset to default condition when SWIF is low.
Sleep Mode
When the LED is off, sleep mode is activated. This is a
reduced current mode that helps minimize overall current
consumption by turning off the clock and the charge
pump while continuing to monitor the serial interface for
commands. Both LDOs can be powered up while in sleep
mode.
SemWire Single Wire Interface Functions
All device functions can be controlled via the SemWire
single wire interface. The interface is described in detail
in the SemWire
Interface section
of the datasheet.
Protection Features
The SC622 provides several protection features to
safeguard the device from catastrophic failures. These
features include:
Output Open Circuit Protection
Over-Temperature Protection
Charge Pump Output Current Limit
LDO Current Limit
LED Float Detection
Output Open Circuit Protection
Over-Voltage Protection (OVP) is provided at the VOUT
pin to prevent the charge pump from producing an
excessively high output voltage. In the event of an open
circuit at VOUT, the charge pump runs in open loop and
the voltage rises up to the OVP limit. OVP operation is
hysteretic, meaning the charge pump will momentarily
turn off until V
OUT
is sufficiently reduced. The maximum
OVP threshold is 6.0V, allowing the use of a ceramic
output capacitor rated at 6.3V with no fear of over-voltage
damage.
Over-Temperature Protection
The Over-Temperature (OT) protection circuit helps
prevent the device from overheating and experiencing
a catastrophic failure. When the junction temperature
exceeds 160 °C, the device goes into thermal shutdown
with all outputs disabled until the junction temperature
is reduced. All register information is retained during
thermal shutdown.
Charge Pump Output Current Limit
The device also limits the charge pump current at the
VOUT pin. When VOUT is shorted to ground, the
typical output current limit is 300mA. The current limiting
is triggered by an output under-voltage lockout below
2V. The output returns to normal when the short is
removed and VOUT is above 2.5V. Above 2.5V, a typical
current limit of 1A applies.
LDO Current Limit
The device limits the output currents of LDO1 and LDO2
to help prevent it from overheating and to protect the
loads. The minimum limit is 200mA, so load current
greater than the rated 100mA can be used with degraded
accuracy and larger dropout without tripping the current
limit.
LED Float Detection
Float detect is a fault detection feature of the LED current
sink output. If the output is programmed to be enabled
and an open circuit fault occurs at the current sink output,
the output will be disabled to prevent a sustained output
OVP condition from occurring due to the resulting open
loop.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SC622_09 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:LED Light Management Unit Charge Pump, 400mA Flash LED, Dual LDOs, and SemWire Interface
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SC622A_09 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:LED Light Management Unit Charge Pump, 400mA Flash LED,Dual LDOs,and I2C Interface
SC622AEVB 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:LED Light Management Unit Charge Pump, 400mA Flash LED, Dual LDOs, and I2C Interface
SC622AULTRT 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:LED Light Management Unit Charge Pump, 400mA Flash LED, Dual LDOs, and I2C Interface
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