900844 datasheet(67/118 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

900844

FUNCTIONAL DEVICE OPERATION

POWER SUPPLIES

•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

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

≤ VPWR ≤ 4.4 V.

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

V15CNT (ADDR 0x39 - R/W - Default value: 0x07)

CTLV15

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

X0 = Do not copy

x1 = Do not copy

x2 = Do not copy

x3 = Do not copy

x4 = OFF

x5 = PFM

x6 = Automatic Pulse Skipping

x7 = PWM

SELV15

7:6

V15 Output Voltage Selection (FSL Usage Only)

X0 = 1.5 V

x1 = 1.6 V

x2, x3 = Reserved

900844 Datasheet(PDF) 67 Page - Freescale Semiconductor, Inc

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