3-26 Theory of Operation: Controller
3.2.2 DC Distribution
SW_B+ supply comes from a pass FET (Q6501) that is powered by UNSW_B+ (battery voltage).
The FET is activated once the power switch is in its on position. SW_B+ supplies the power for the
entire controller. SW_B+ supplies MAKO and the external regulators. MAKO and the external
regulators then regulate the voltage to the desired level. (See Figure 3-19.)
OMAP's core is supplied by VCC_SW_1.4 (U6507). 1.85 LDO supplies OMAP's IO, FLASH, CPLD,
DDR, and MACE. See Table 3-2 for DC supplies and sources.
Figure 3-19. Controller DC Block Diagram
LDO2
LDO3
SW2
LDO4
LDO6
LDO7
LDO9
LDO10
SW5
VBUS1
VBUS2
External SW
TPS62050
MAKO
SW_B+
SW_B+
SW_B+
V_SW_3.6
SW1_3.6V
SW5_5.4V
1.55V
1.875V
V_EXT_1.85
2.23V
2.775V
2.775V
2.775V
3.0V
3.3V
LDO8
SW_B+
5.0V
5.0V
5.0V
EXSW_1.4V
800mA Max
400mA Max
120mA Max
150mA Max
100mA Max
50mA Max
100mA Max
50mA Max
70mA Max
1.5A Max
500mA Max
500mA Max
25mA Max
800mA Max
Ext SW
TPS62050
Ext LDO
TPS73601
Ext LDO
LP38693
SW1
3.6V
External SW
TPS62110
External Switcher Replaced
Switcher MAKO’s Switchr 5
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