MMPF0100NPEP Datasheet, PDF (84/137 Pages) Freescale Semiconductor, Inc – Four to six buck converters, depending on configuration

Functional Block Requirements and Behaviors
Power Generation
6.4.6.2 Short-circuit Protection
All general purpose LDOs have short-circuit protection capability. The Short-circuit Protection (SCP) system includes debounced
fault condition detection, regulator shutdown, and processor interrupt generation, to contain failures and minimize the chance of
product damage. If a short-circuit condition is detected, the LDO will be disabled by resetting its VGENxEN bit, while at the same
time, an interrupt VGENxFAULTI will be generated to flag the fault to the system processor. The VGENxFAULTI interrupt is
maskable through the VGENxFAULTM mask bit.
The SCP feature is enabled by setting the REGSCPEN bit. If this bit is not set, the regulators will not automatically be disabled
upon a short-circuit detection. However, the current limiter will continue to limit the output current of the regulator. By default, the
REGSCPEN is not set; therefore, at start-up none of the regulators will be disabled if an overloaded condition occurs. A fault
interrupt, VGENxFAULTI, will be generated in an overload condition regardless of the state of the REGSCPEN bit. See Table 89
for SCP behavior configuration.
Table 89. Short-circuit Behavior
REGSCPEN[0]
0
1
Short-circuit Behavior
Current limit
Shutdown
6.4.6.3 LDO Regulator Control
Each LDO is fully controlled through its respective VGENxCTL register. This register enables the user to set the LDO output
voltage according to Table 90 for VGEN1 and VGEN2; and uses the voltage set point on Table 91 for VGEN3 through VGEN6.
Table 90. VGEN1, VGEN2 Output Voltage Configuration
Set Point
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
VGENx[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
VGENx Output (V)
0.800
0.850
0.900
0.950
1.000
1.050
1.100
1.150
1.200
1.250
1.300
1.350
1.400
1.450
1.500
1.550
PF0100
84
Analog Integrated Circuit Device Data
Freescale Semiconductor