LG LG-A155, Service Manual

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Only for training and service purposes LGE Internal Use Only
3. TECHNICAL BRIEF
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΀ΟΝΪ͑ΗΠΣ͑ΥΣΒΚΟΚΟΘ͑ΒΟΕ͑ΤΖΣΧΚΔΖ͑ΡΦΣΡΠΤΖΤ
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3. TECHNICAL BRIEF
̲
SIM2 LDO (Vsim2)
The SIM2 LDO is a linear regulator that could source 20mA (max) with 1.8V or 3.0V output voltage selection
based on the supply specs of the 2nd subscriber identity modules (SIM) card.
It supplies the 2nd SIM card and SIM level shifter circuitry in the handset. The Vsim2 LDO is controlled
independently by the register named VSIM2_EN.
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USB LDO (Vusb)
The USB LDO is a linear regulator that could source 75mA (max) with 3.3V output dedicated for USB
circuitry. It is controlled independently by the register named RG_VUSB_EN.
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Memory Card / Bluetooth LDO (Vbt)
The VBT LDO is a linear regulator that could source 150mA (max) with 1.5V, 1.8V, 2.5V or 2.8V output for
memory card or Bluetooth module. It is controlled independently by the register named RG_VBT_EN.
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Camera Analog LDO (Vcama)
The Vcama LDO is a linear regulator that could source 150mA (max) with 1.5V, 1.8V, 2.5V or 2.8V output
which is selected by the register named VCAMA_SEL[1:0]. It supplies the analog power of the camera
module. Vcama is controlled independently by the register named RG_VCAMA_EN.
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Camera Digital LDO (Vcamd)
The Vcamd LDO is a linear regulator that could source 75mA (max) with 1.3V, 1.5V, 1.8V or 2.8V output
which is selected by the register named VCAMD_SEL[1:0]. It supplies the digital power of the camera
module. Vcamd is controlled independently by the register named RG_VCAMD_EN.