Motorola APX 1000 Detailed Service Manual page 730

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3.2.2.1 DC Distribution Major Components
The controller's DC section is made up of MAKO and external regulators. This section will give an
overview of the schematics and circuitry that makes up the major supplies of the DC architecture.
3.2.2.1.1 MAKO
MAKO (U6501) is a custom power management IC manufactured by Atmel. MAKO controls almost
all of the LDO supplies to the controller.
feed them. Figure 3-15
accessed to verify operation.
be accessed. MAKO is also responsible for the timing sequence for the enabling of the regulators
which is discussed further in
Name
ON_OFF_SWITCH
UNSW_B+
SW_B+
V_SAVE
V_1.875
V_1.55
V_2.775D
V_2.775_EXP
V_2.8_RF
V_5.0A
V_3.3
V_3.0A
Table 3-3
shows all of MAKO's LDOs their voltage level and components that can be
Figure 3-15 also shows where the battery supply and on off switch can
section 3.1.3.7.1
Table 3-3. MAKO's LDO and Supplies
Ref
MAKO_IGN_X ON/OFF Switch. Radio on when GND
F_UNSW_B+ Radio Battery Voltage
C6593 Radio Supply Voltage
C6538 LDO Output Present When Battery is Attached
C6581 LDO Output
R6561 LDO Output
R6563 LDO Output
R6562 LDO Output
R6564 LDO Output
R6565 LDO Output
R6566 LDO Output
R6567 LDO Output
illustrates all of MAKO's LDO and the supplies that
and section 3.1.3.7.2.
Description
Theory of Operation
: Controller
Level
GND
6–9V
6–9 V
2.5 V
1.875 V
1.55 V
2.775 V
2.775 V
2.8 V
5.0 V
3.3 V
3.0 V