SLUS530D − SEPTEMBER 2002 − REVISED SEPTEMBER 2003
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17
APPLICATION INFORMATION
PCB LAYOUT CONSIDERATIONS
It is important to pay special attention to the PCB layout. The following provides some guidelines:
To obtain optimal performance, the decoupling capacitor from V
CC
to V
SS
and the output filter capacitors from
BAT to ISET should be placed as close as possible to the bqTINY, with short trace runs to both signal and V
SS
pins.
All low-current V
SS
connections should be kept separate from the high-current charge or discharge paths from
the battery. Use a single-point ground technique incorporating both the small signal ground path and the power
ground path.
The BAT pin is the voltage feedback to the device and should be connected with its trace as close to the battery
pack as possible.
The high current charge paths into IN and from the OUT pins must be sized appropriately for the maximum charge
current in order to avoid voltage drops in these traces.
The bqTINY is packaged in a thermally enhanced MLP package. The package includes a thermal pad to provide
an effective thermal contact between the device and the printed circuit board (PCB). Full PCB design guidelines
for this package are provided in the application note entitled: QFN/SON PCB Attachment Application Note (TI
Literature No. SLUA271).
There is an internal electrical connection between the exposed thermal pad and V
SS
pin of the device. The
exposed thermal pad must be connected to the same potential as the V
SS
pin on the printed circuit board. Do
not use the thermal pad as the primary ground input for the device. V
SS
pin must be connected to ground at all
times.
Summary of Contents for PV420S
Page 1: ...SERVICE MANUAL PV420S WWW BBK RU ...
Page 72: ... 69 CXD3068Q Block Diagram ...
Page 73: ... 70 CXD3068Q Pin Configuration ...
Page 122: ... 119 CXD3068Q Timing Chart 1 3 ...
Page 123: ... 120 CXD3068Q Timing Chart 1 4 ...
Page 124: ... 121 CXD3068Q Timing Chart 1 5 ...
Page 129: ... 126 CXD3068Q Timing Chart 2 1 ...
Page 130: ... 127 CXD3068Q Block Diagram 2 2 ...
Page 131: ... 128 CXD3068Q Timing Chart 2 3 ...
Page 134: ... 131 CXD3068Q Timing Chart 2 6 ...
Page 138: ... 135 CXD3068Q VCO C Mode Fig 3 3 Access Flow Chart Using VCO Control ...
Page 140: ... 137 CXD3068Q Block Diagram 4 1 ...
Page 143: ... 140 CXD3068Q Timing Chart 4 4 ...
Page 147: ... 144 CXD3068Q Fig 4 6 a Auto Focus Flow Chart Fig 4 6 b Auto Focus Timing Chart ...
Page 148: ... 145 CXD3068Q Fig 4 7 a 1 Track Jump Flow Chart Fig 4 7 b 1 Track Jump Timing Chart ...
Page 149: ... 146 CXD3068Q Fig 4 8 a 10 Track Jump Flow Chart Fig 4 8 b 10 Track Jump Timing Chart ...
Page 150: ... 147 CXD3068Q Fig 4 9 a 2N Track Jump Flow Chart Fig 4 9 b 2N Track Jump Timing Chart ...
Page 151: ... 148 CXD3068Q Fig 4 10 a Fine Search Flow Chart Fig 4 10 b Fine Search Timing Chart ...
Page 152: ... 149 CXD3068Q Fig 4 11 a M Track Move Flow Chart Fig 4 11 b M Track Move Timing Chart ...
Page 157: ... 154 CXD3068Q Fig 4 15 CD TEXT Data Timing Chart ...
Page 162: ... 159 CXD3068Q Fig 5 3a Fig 5 3b ...
Page 196: ... 193 CXD3068Q Description of Data Readout ...
Page 200: ... 197 CXD3068Q ...
Page 201: ... 198 CXD3068Q ...
Page 202: ... 199 CXD3068Q ...
Page 207: ... 204 CXD3068Q Package Outline Unit mm ...
Page 208: ...This data sheet has been made from recycled paper to help protect the environment 205 ...
