CC3120 Datasheet, PDF (36/57 Pages) Texas Instruments – SimpleLink Wi-Fi Wireless Network Processor Internet-of-Things Solution for MCU Applications

CC3120
SWAS034 – FEBRUARY 2017
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5.4 Power-Management Subsystem
The CC3120R power-management subsystem contains DC-DC converters to accommodate the different
voltage or current requirements of the system.
• Digital DC-DC (Pin 44)
– Input: VBAT wide voltage (2.1 to 3.6 V) or preregulated 1.85 V
• ANA1 DC-DC (Pin 38)
– Input: VBAT wide voltage (2.1 to 3.6 V)
– In preregulated 1.85-V mode, the ANA1 DC-DC converter is bypassed.
• PA DC-DC (Pin 39)
– Input: VBAT wide voltage (2.1 to 3.6 V)
– In preregulated 1.85-V mode, the PA DC-DC converter is bypassed.
The CC3120R device is a single-chip WLAN radio solution used on an embedded system with a wide-
voltage supply range. The internal power management, including DC-DC converters and LDOs, generates
all of the voltages required for the device to operate from a wide variety of input sources. For maximum
flexibility, the device can operate in the modes described in Section 5.4.1 and Section 5.4.2.
5.4.1 VBAT Wide-Voltage Connection
In the wide-voltage battery connection, the device is powered directly by the battery or preregulated 3.3-V
supply. All other voltages required to operate the device are generated internally by the DC-DC
converters. This scheme supports wide-voltage operation from 2.1 to 3.6 V and is thus the most common
mode for the device.
5.4.2 Preregulated 1.85V
The preregulated 1.85-V mode of operation applies an external regulated 1.85 V directly at pins 10, 25,
33, 36, 37, 39, 44, 48, and 54 of the device. The VBAT and the VIO are also connected to the 1.85-V
supply. This mode provides the lowest BOM count version in which inductors used for PA DC-DC and
ANA1 DC-DC (2.2 and 1 µH) and a capacitor (22 µF) can be avoided.
In the preregulated 1.85-V mode, the regulator providing the 1.85 V must have the following
characteristics:
• Load current capacity ≥900 mA
• Line and load regulation with <2% ripple with 500-mA step current and settling time of < 4 µs with the
load step
NOTE
The regulator must be placed as close as possible to the device so that the IR drop to the
device is very low.
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Detailed Description
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