900844 Datasheet, PDF (67/118 Pages) Freescale Semiconductor, Inc – Integrated Power Management IC for Ultra-mobile and Embedded Applications

• 4.0 MHz switching frequency
• High efficiency operating modes depending on load conditions
• Output can be discharged through the low side switch.
• Peak current sensing with over-current protection
• Uses internal compensation
• Gate drive circuits are supplied directly from VPWR
FUNCTIONAL DEVICE OPERATION
POWER SUPPLIES
Efficiency Curves
Figure 33 efficiency curves are calculated under PWM mode, based on the recommended external component values and
typical output voltage of 1.5 V. 3.0 V ≤ V_PWR ≤ 4.4 V.
4
Figure 33. V15 Efficiency Curves
V15 Status/Control Registers and Bits Description
Reference the register map for read/write conditions and default state for each of these registers.
Table 29. V15CNT Register Structure and Bits Description
Name
Bits
Description
CTLV15
V15CNT (ADDR 0x39 - R/W - Default value: 0x07)
2:0 ^{V15 State Control}
x0 = Reserved
x1 = Reserved
x2 = Reserved
x3 = Reserved
x4 = OFF
x5 = PFM
x6 = Automatic Pulse Skipping
x7 = PWM
AOACCTLV15 5:3 ^{V15 State Control during AOAC Exit (when EXITSTBY pin is asserted). These bits will be initialized by the system SPI}
controller after power up
SELV15
X0 = Do not copy
x1 = Do not copy
x2 = Do not copy
x3 = Do not copy
7:6 V15 Output Voltage Selection (FSL Usage Only)
X0 = 1.5 V
x1 = 1.6 V
x2, x3 = Reserved
x4 = OFF
x5 = PFM
x6 = Automatic Pulse Skipping
x7 = PWM
Analog Integrated Circuit Device Data
Freescale Semiconductor
900844
67