LP3950SL/NOPB National Semiconductor, LP3950SL/NOPB Datasheet - Page 29

• Manufacturer Part Number: LP3950SL/NOPB
• Description: IC LED DRVR WHITE BCKLGT 32-TSCP
• Manufacturer: National Semiconductor
• Series: PowerWise®r
• Type: Backlight, White LED (I²C Interface)r

Specifications of LP3950SL/NOPB

• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 6
• Internal Driver: Yes
• Type - Primary: Flash/Torch, LED Blinker, Light Management Unit (LMU)
• Type - Secondary: RGB, White LED
• Frequency: 2MHz
• Voltage - Supply: 2.7 V ~ 2.9 V
• Voltage - Output: 5V
• Mounting Type: Surface Mount
• Package / Case: 32-Laminate TCSP
• Operating Temperature: -40°C ~ 85°C
• Internal Switch(s): Yes
• Efficiency: 90%
• Led Driver Application: Mobile Phone Display Lighting, General LED Lighting
• No. Of Outputs: 6
• Output Current: 300mA
• Output Voltage: 5.3V
• Input Voltage: 3V To 7.2V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output / Channel: -
• Other names: LP3950SL/CSP1; LP3950SLTR

Typical Applications
There may be cases where the audio input signal going into the LP3950 is too weak for audio synchronization. This figure
presents a single-supply inverting amplifier connected to the ASE input for audio signal amplification. The amplification is +20 dB,
which is well enough for 20 mV
divider using R
of the amplifier. The capacitor C
signal source. The values of R
the LMV321 output signal is centered around mid-supply, that is V
signal-to-noise ratio in a low voltage system
FIGURE 24. Backlight and Keypad LEDs Controlled by the Pattern Generator - Funlight LEDs Controlled by Audio
3
and R
4
is implemented to bias the amplifier so the input signal is within the input common-mode voltage range
1
p-p
and C
4
is placed between the inverting input and resistor R
audio signal. Because the amplifier (LMV321) is operating in single supply voltage, a voltage
(Continued)
4
affect the cutoff frequency, f
Synchronization
29
c
= 1/(2*Pi*R
DD
/2. The output can swing to both rails, maximizing the
1
*C
4
), in this case it is around 160 Hz. As a result,
1
to block the DC signal going into the audio
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