TPS51103
www.ti.com . SLUS808 – JUNE 2008 INTEGRATED LDO WITH SWITCHOVER CIRCUIT FOR NOTEBOOK COMPUTERS
FEATURES 1 DESCRIPTION Wide Input Voltage Range: 4.5 V to 28 V
5-V/3.3-V, 100-mA, LDO Output
Glitch Free Switch Over Circuit
Always-On 3.3-V, 5-mA LDO Output for RTC
250 kHz Clock Output for Charge Pump
Thermal Shutdown (Non-latch)
10Ld QFN (DRC) Package The TPS51103 integrates three LDOs. The 5-V and
3.3-V LDOs are both rated at 100 mA and also
include a glitch-free switch-over feature allowing for
optimized battery life. An additional 3.3-V LDO is
designed to provide an always on power output for
the real time clock (RTC). The TPS51103 integrates
a clock output to use with an external charge pump.
The TPS51103 offers an innovative solution for
optimizing the complex and multiple power rails
typically found in a Notebook Computer. The
TPS51103 is available in the 10-pin QFN package
and is specified from –40°C to 85°C. APPLICATIONS Notebook Computers
Mobile Digital Consumer Products TYPICAL APPLICATION CIRCUIT V15 A2 AC2 C2 C1 AC1 A1 C8
1 mF C5
0.1 mF 5V_IN …
