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LP3315 Datasheet(PDF) 6 Page - Lowpower Semiconductor inc

Part # LP3315
Description  1.2MHzFixed-Frequency PWM Operation
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Manufacturer  POWER [Lowpower Semiconductor inc]
Direct Link  http://www.lowpowersemi.com
Logo POWER - Lowpower Semiconductor inc

LP3315 Datasheet(HTML) 6 Page - Lowpower Semiconductor inc

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Preliminary Datasheet
LP3315
LP3315– 00 Version1.0 Datasheet
Feb.-2012
www.lowpowersemi.com
Page 6 of 8
Applications Information
Inductor Selection
The recommended value of inductor for 30V applications are 4.7 to 22µH. Small size and better efficiency are the
major concerns for portable device, such as LP3315 used for mobile phone. The inductor should have low core
loss at 1.2MHz and low DCR for better efficiency. To avoid inductor saturation current rating should be considered.
Constant Output Voltage Control
The output voltage of the LP3315 can be adjusted by the divider circuit on the FB pin. Typical FB voltage is
1250mV. The output voltage can be calculated by the following Equations.
Power Sequence
In order to assure the normal soft start function for suppressing the inrush current the input voltage should be
ready before EN pulls high.
Soft-Start
The function of soft-start is made for suppressing the inrush current to an acceptable value at the beginning of
power on. The LP3315 provides a built-in soft-start function by clamping the output voltage of error amplifier so
that the duty cycle of the PWM will be increased gradually in the soft-start period.
Current Limiting
The current flow through inductor as charging period is detected by a current sensing circuit. As the value comes
across the current limiting threshold, the N-MOSFET will be turned off so that the inductor will be forced to leave
charging stage and enter discharging stage. Therefore, the inductor current will not increase over the current
limiting threshold.
OVP/UVLO/OTP
The Over Voltage Protection is detected by a junction breakdown detecting circuit. Once VOUT goes over the
detecting voltage, LX pin stops switching and the power N-MOSFET will be turned off. Then, the VOUT will be
clamped to be near VOVP. As the output voltage is higher than a specified value or input voltage is lower than a
specified value, the chip will enter protection mode to
prevent abnormal function. As the die temperature is higher then 160°C, the chip also will enter protection mode.
The power MOSFET will be turned off during protection mode to prevent abnormal operation.
Thermal Considerations
For continuous operation, do not exceed absolute maximum operation junction temperature. The maximum power
dissipation depends on the thermal resistance of IC package, PCB layout, the rate of surroundings airflow and
temperature difference between junction to ambient. The maximum power dissipation can be calculated by
following formula :
Where TJ(MAX) is the maximum operation junction temperature, TA is the ambient temperature and the qJA is the


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