Datasheet

Functional Description
MC13783 Technical Data, Rev. 3.5
Freescale Semiconductor 25
The buck switchers support dynamic voltage scaling (DVS). The buck switchers are designed to directly
supply the processor cores. To reduce overall power consumption, core voltages of processors may be
varied depending on the mode the processor is in. The DVS scheme of the buck switchers allows to
transition between the different set points in a controlled and smooth manner.
For reduced current drain in low power modes, parts of a processor may be power gated, that is to say, the
supply to that part of the processor is disabled. To simplify the supply tree and to reduce the number of
external components while maintaining flexibility, power gate switch drivers are included.
Minimum Bypass Capacitor Value Used as a condition for all other
parameters.
-35% 2.2 +35% µF
Minimum Bypass Capacitor Value for:
VRFREF, VRFCP, VIOHI, VSIM, VESIM
Used as a condition for all other
parameters.
-35% 1 — µF
Bypass Capacitor Value for VAUDIO Used as a condition for all other
parameters.
-35% 1 +35% µF
Bypass Capacitor Value for VRFBG Used as a condition for all other
parameters.
— 100 — nF
Bypass Capacitor ESR 10 kHz - 1 MHz 0 — 0.1 Ω
Table 11. Buck Switcher Characteristics
Parameter Condition Min Typ Max Units
Output Voltage 2.8 V < BP < 4.65 V
0 < IL < 500 mA
0.900 V to 1.675 V in 25 m V steps
1.700 V to 2.200 V in 100 V steps
V
Output Accuracy PWM Mode, including ripple and
load regulation
-50 — +50 mV
Transient Load Response IL from 5 mA to 400 mA in 1μs
IL from 400 mA to 5 mA in 1μs
— — +/- 25 mV
Effective Quiescent
Current Consumption
PWM MODE — 50 — µA
PFM MODE — 15 — µA
External Components Inductor -20% 10 +20% µH
Inductor Resistance — — 0.16 Ω
Bypass Capacitor -35% 22 +35% µF
Bypass Capacitor ESR 0.005 — 0.1 Ω
Table 10. Regulator General Characteristics (continued)
Parameter Condition Min Typ Max Units