CDH2D09 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
MFG CO.
'CDH2D09' PDF : 44 Pages View PDF
PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
VDC
VUSB
VVL
VSYS
VBAT
VEN
VOUT1
VOUT2
VOUT3
VOUT4
VOUT5
VUOK HIGH-Z
VBAT < VSYS < (VUSB OR VDC)
tD1
tSS1
tSS2
tD2
tSS3
tD3
tSS4
tSS5
VBAT
INTERNAL
DISCHARGE
RESISTORS
HIGH-Z
HIGH-Z
VDOK
HIGH-Z
Figure 12. Enable and Disable Waveforms
The VL regulator is not controlled by EN. It is powered
from the higher of USB or DC and automatically powers
up when either of the power inputs exceeds approxi-
mately 1.5V. Similarly, VL automatically powers down
when both the USB and DC power inputs are removed.
Soft-Start/Inrush Current
The MAX8671X implements soft-start on many levels to
control inrush current, to avoid collapsing supply volt-
ages, and to fully comply with the USB 2.0 specifica-
tions. All USB, DC, and charging functions implement
soft-start. The USB and DC nodes only require 4.7µF of
input capacitance. Furthermore, all regulators imple-
ment soft-start to avoid transient overload of power
inputs (Figure 12).
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