LTC3882_15 Datasheet, PDF (74/104 Pages) Linear Technology – Dual Output PolyPhase Step-Down DC/DC Voltage Mode Controller with Digital Power System Management

LTC3882
PMBus COMMAND DETAILS (PWM Configuration)
MFR_PWM_MODE_LTC3882
The MFR_PWM_MODE_LTC3882 command sets important PWM controls for each channel. The addressed channel(s)
must be turned off by its RUN pin, OPERATION command, or their combination, when this command is issued. Oth-
erwise the LTC3882 will NACK the command byte, ignore the command and its data, and assert a BUSY fault.
When bit 5 is cleared, the LTC3882 computes temperature in °C from ΔV_BE measured by the ADC at the TSNSn pin as
T = (G • ΔV_BE • q/(K • ln(16))) – 273.15 + O
When bit 5 is set, the LTC3882 computes temperature in °C from TSNSn voltage measured by the ADC as
T = (G • (1.35 – V_TSNSn + O)/4.3e-3) + 25
For both equations,
G = MFR_TEMP_1_GAIN • 2^–14, and
O = MFR_TEMP_1_OFFSET
Supported Values:
BIT MEANING
7
Output voltage range select:
0: Maximum V_OUT = 5.25V.
1: Maximum V_OUT = 2.65V.
6*
Enable V_OUT servo.
5
External temperature sense:
0: ΔV_BE measurement.
1: Direct voltage measurement.
4:3 BOOST refresh width:
11b: 250ns
10b: 125ns
01b: 50ns
00b: 25ns
2:1 PWM control protocol:
11b: Independent TG/BG control outputs.
10b: 2-State PWM output (with active-low OD, open-drain).
01b: 2-State PWM output (with active-high EN).
00b: 3-State PWM output (EN pin selects sub-protocol, refer to Applications Information).
0
PWM mode:
0: Forced continuous inductor current.
1: Discontinuous inductor current.
*This bit is ignored (servo disabled) if MFR_VOUT_AVP for this channel is programmed to a value greater than 0.0%.
This command has one data byte.
3882f
74
For more information www.linear.com/LTC3882