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LTC3892-1 Datasheet(PDF) 10 Page - Linear Technology

Part # LTC3892-1
Description  60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3892-1 Datasheet(HTML) 10 Page - Linear Technology

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LTC3892/LTC3892-1
10
38921f
For more information www.linear.com/LTC3892
pin FuncTions (LTC3892 (QFN)/LTC3892-1 (TSSOP))
FREQ (Pin 1/ Pin 5): The frequency control pin for the
internal VCO. Connecting this pin to GND forces the VCO
to a fixed low frequency of 350kHz. Connecting this pin
to INTVCC forces the VCO to a fixed high frequency of
535kHz.Otherfrequenciesbetween50kHzand900kHzcan
be programmed using a resistor between FREQ and GND.
The resistor and an internal 20µA source current create a
voltage used by the internal oscillator to set the frequency.
PLLIN/MODE (Pin 2/Pin 6): External Synchronization
Input to Phase Detector and Forced Continuous Mode
Input. When an external clock is applied to this pin, the
phase-locked loop will force the rising TG1 signal to be
synchronized with the rising edge of the external clock,
and the regulators will operate in forced continuous
mode. When not synchronizing to an external clock, this
input, which acts on both controllers, determines how the
LTC3892/LTC3892-1 operates at light loads. Pulling this
pin to ground selects Burst Mode operation. An internal
100kresistortogroundalsoinvokesBurstModeoperation
when the pin is floated. Tying this pin to INTVCC forces
continuous inductor current operation. Tying this pin to
a voltage greater than 1.1V and less than INTVCC – 1.3V
selects pulse-skipping operation. This can be done by
connecting a 100k resistor from this pin to INTVCC.
PGOOD1, PGOOD2 (Pins 3, 4/NA): Open-Drain Logic
Output. PGOOD1,2 is pulled to ground when the voltage
on the respective VFB1,2 pin is not within ±10% of its set
point. These pins are only available on the LTC3892, not
the LTC3892-1.
INTVCC (Pin 5/Pin 7): Output of the Internal 5V Low Drop-
out Regulator. The low voltage analog and digital circuits
are powered from this voltage source. A low ESR 0.1µF
ceramic bypass capacitor should be connected between
INTVCC and GND, as close as possible to the IC.
RUN1, RUN2 (Pins 6, 7/Pins 8, 9): Run Control Inputs
for Each Controller. Forcing any of these pins below 1.2V
shuts down that controller. Forcing all of these pins below
0.7VshutsdowntheentireLTC3892/LTC3892-1,reducing
quiescent current to approximately 3.6µA.
ILIM(Pin8/NA):CurrentComparatorSenseVoltageRange
Input. Tying this pin to GND or INTVCC or floating it sets
the maximum current sense threshold (for both channels)
to one of three different levels (50mV, 100mV, or 75mV
respectively). This pin is only available on the LTC3892,
not the LTC3892-1. For the LTC3892-1, the maximum
current sense threshold is 75mV.
VFB2(Pin11/Pin12):Thispinreceivestheremotelysensed
feedback voltage for channel 2 from an external resistor
divider across the output.
DRVUV (Pin13/Pin 14): Determines the higher or lower
DRVCC UVLO and EXTVCC switchover thresholds, as listed
on the Electrical Characteristics table. Connecting DRVUV
toGNDchoosesthelowerthresholdswhereastyingDRVUV
to INTVCC chooses the higher thresholds.
DRVSET (Pin 14/Pin 15): Sets the regulated output volt-
age of the DRVCC LDO regulator. Connecting this pin to
GND sets DRVCC to 6V whereas connecting it to INTVCC
sets DRVCC to 10V. Voltages between 5V and 10V can be
programmed by placing a resistor (50k to 100k) between
the DRVSET pin and GND.
DRVCC (Pin 20/Pin 21): Output of the Internal or External
Low Dropout (LDO) Regulator. The gate drivers are pow-
ered from this voltage source. The DRVCC voltage is set
by the DRVSET pin. Must be decoupled to ground with a
minimum of 4.7µF ceramic or other low ESR capacitor.
Do not use the DRVCC pin for any other purpose.
EXTVCC(Pin21/Pin22):ExternalPowerInputtoanInternal
LDOConnectedtoDRVCC.ThisLDOsuppliesDRVCCpower,
bypassing the internal LDO powered from VIN whenever
EXTVCC is higher than its switchover threshold (4.7V or
7.7V depending on the DRVSET pin). See EXTVCC Con-
nection in the Applications Information section. Do not
float or exceed 14V on this pin. Do not connect EXTVCC
to a voltage greater than VIN. Connect to GND if not used.
VIN (Pin 22/Pin 23): Main Supply Pin. A bypass capacitor
should be tied between this pin and the GND pin.


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