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SC622A データシート(PDF) 15 Page - Semtech Corporation

部品番号 SC622A
部品情報  LED Light Management Unit Charge Pump, 400mA Flash LED, Dual LDOs, and I2C Interface
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メーカー  SEMTECH [Semtech Corporation]
ホームページ  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC622A データシート(HTML) 15 Page - Semtech Corporation

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SC622A
15
Applications Information (continued)
Programmable LDO Outputs
Two low dropout (LDO) regulators are provided for
camera module I/O and core power. Each LDO has at least
100mA of available load current with ±3.5% accuracy. The
minimum current limit is 200mA, so outputs greater than
100mA are possible at somewhat reduced accuracy.
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 EN pin is low. All registers
are reset to default condition when EN 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.
I2C Compatible Interface Functions
All device functions can be controlled via the I2C
compatible interface. The interface is described in detail
in the Serial Interface section of the datasheet.
Protection Features
The SC622A 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.


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