Maxim Integrated MAX20335, Manual

Page: 27 / 67

Detailed Description
Power Regulation
The MAX20335 family includes two high-efficiency, low
quiescent current buck regulators, and three low quiescent
current linear regulators that are also configurable as
power switches. Excellent light-load efficiency allows
the switching regulators to run continuously without
significant energy cost.
Power On/Off and Reset Control
The behavior of power function control pins (PFN1 and
PFN2) is preconfigured to support one of the multiple
types of wearable application cases. Table 1 describes
the behavior of the PFN1 and PFN2 pins based on
the PwrRstCfg[3:0] bits and Figure 1 shows basic flow
diagrams associated with each mode.
A Soft-Reset generates a 10ms logic low pulse at
RST
and resets all registers to their default values. A Hard-
Reset initiates a complete Power-On Reset sequence and
generates a 50ms logic-low pulse at RST .
MAX20335 PMIC with Ultra-Low I
Q
Voltage Regulators and
Battery Chargers for Small Lithium Ion Systems
www.maximintegrated.com
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Block Diagram
MAX20335
SYS
LINEAR
Li+ BATTERY CHARGER
WITH POWER SELECTOR
28V/-5.5V INPUT
PROTECTION
POWER
SEQUENCER
BUCK 1
MONITOR BUCK 2
CONTROL
LDO/SWITCH 1
LDO/SWITCH 2
LDO/SWITCH 3
POWER
DATA