MAX77928 datasheet(21/88 Pages) AD

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10A 3:1/2:1/1:1 Switched-Capacitor

Direct Charger for 1S Li-Ion Battery

MAX77928

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doing it this way, the SCC saves power in light loads, provides high efficiency at the entire load range, and maintains

VPMID close to VVOUT x N.

Audio Mode

When the SCC operates in skip mode, the skip frequency can be observed at audio frequency of which frequency ranges

from 20Hz to 20kHz. It may create audible noise in multilayer chip capacitor on the PCB. The IC provides audio mode

which keeps the minimum skip frequency at fSW_AUD (25kHz typical for all switching frequency options).

Frequency Dithering

EMI emissions with a dominant peak frequency can be produced from SCC operation. Frequency dithering can reduce

the peak emission of the SCC by spreading the emission over a frequency band. The IC includes a frequency dithering

feature applicable to all synthesized frequencies (from 200kHz up to 1.5MHz). Dithering can be disabled or enabled by

DTHR and programmed to different spreads by DTHR_DEPTH (3%, 6%).

SCC State Diagram

Figure 2 shows the operation states of SCC and conditions to trigger state transitions. All registers are reset to their

default value for each state transition from the Standby state to the Shutdown state. ENB input and

STANDBY_MODE_SET bit control the state transition between the Shutdown state and the Standby state.

OPERATION_MODE[2:0] controls the state transition between the Standby state and the Active state.

SHUTDOWN

NO POWER

NO VALID SOURCE

VALID SOURCE

STANDBY

ENB = 1

OR STANDBY_MODE_SET = 0

OR WATCHDOG EXPIRE

ENB = 0

AND STANDBY_MODE_SET = 1

ERROR

ANY SYSTEM ERROR

ACTIVE

OPERATION_MODE = 0

OPERATION_MODE != 0

SYSTEM ERROR CLEAR

DEEP SHUTDOWN

VIO = 0

AND NO VALID INPUT

VIO = 1

OR VALID INPUT

Figure 2. SCC State Diagram

MAX77928 Datasheet(PDF) 21 Page - Analog Devices

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