MC13892VK Freescale Semiconductor, MC13892VK Datasheet - Page 14

• Manufacturer Part Number: MC13892VK
• Description: IC PMU I.MX51/37/35/27 139MAPBGA
• Manufacturer: Freescale Semiconductor

Specifications of MC13892VK

• Applications: Battery Management, Display (LED Drivers), Handheld/Mobile Devices, Power Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: *
• Output Current: 65 mA
• Output Voltage: 1.5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Voltage - Supply: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

LDO AND BATTERY CHARGER ROUTING
Figure 17. Recommended Configuration.
8
LDO and Battery Charger Routing
The LDOs and battery charger do not handle much current in this application, so their routing is not critical. The
same philosophy must be followed for current handling on the traces though.
For a proper functionality of these supplies, bypass and output capacitors must be placed near the IC to achieve a
good width and shortness of the traces. The ESR of the output capacitors of the external PNP LDOs must be
between 20 and 100 mΩ, in order to achieve good stability. If they are not within these values, an additional resistor
will be needed. This resistance can be achieved with a copper trace on the board and is also a cost saving.
The critical signals for the charger that must not be contaminated by high frequency or power ones are highlighted
in
Figure
18.
Figure 18. Critical Signals on the Battery Charger.
The sense lines should be routed from the sense resistor endpoints and should not be included in high current
charge path. They should also have a maximum of 1.0 nH parasitic inductance and 30 mΩ of resistance.
Charge path can handle up to 1600 mA, so following the rule listed previously, for 1.0 oz copper, the trace width must
be at least 16 mils.
As a placement suggestion, the thermistor must be located as close to the battery as possible for a correct
temperature reading.
13892
Analog Integrated Circuit Device Data
14
Freescale Semiconductor