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LTC3892-1 Datasheet(PDF) 11 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) 11 Page - Linear Technology

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LTC3892/LTC3892-1
11
38921f
For more information www.linear.com/LTC3892
pin FuncTions (LTC3892 (QFN)/LTC3892-1 (TSSOP))
BG1, BG2 (Pins 23, 19/Pins 24, 20): High Current Gate
Drives for Bottom N-Channel MOSFETs. Voltage swing at
these pins is from ground to DRVCC.
BOOST1,BOOST2(Pins24,18/Pins25,19):Bootstrapped
Supplies to the Topside Floating Drivers. Capacitors are
connected between the BOOST and SW pins. Voltage
swing at BOOST1 and BOOST2 pins is from approximately
DRVCC to (VIN1,2 + DRVCC).
SW1, SW2 (Pins 25, 17/Pins 26, 18): Switch Node Con-
nections to Inductors.
TG1, TG2 (Pins 26, 16/Pins 27, 17): High Current Gate
Drives for Top N-Channel MOSFETs. These are the outputs
of floating drivers with a voltage swing equal to DRVCC
superimposed on the switch node voltage SW.
TRACK/SS1, TRACK/SS2 (Pins 27, 15/Pins 28, 16):
External Tracking and Soft-Start Input. The LTC3892/
LTC3892-1 regulates the negative input (EA) of the er-
ror amplifier to the smaller of 0.8V or the voltage on the
TRACK/SS pin. An internal 10µA pull-up current source
is connected to this pin. A capacitor to ground at this pin
sets the ramp time at start-up to the final regulated output
voltage. Alternatively, a resistor divider on another sup-
ply connected to the TRACK/SS pin allows the LTC3892/
LTC3892-1 output voltage to track the other supply during
start-up. The TRACK/SS pin is pulled low in shutdown or
in undervoltage lockout.
VPRG1(Pin28/NA):Channel1OutputVoltageControlPin.
This pin sets channel 1 to adjustable output mode using
external feedback resistors or fixed 3.3V/5V output mode.
Floating this pin allows the output to be programmed from
0.8V to 60V with an external resistor divider, regulating
VFB1 to 0.8V. This pin is only available on the LTC3892,
not the LTC3892-1.
ITH1, ITH2 (Pins 29, 12/Pins 1, 13): Error Amplifier
Outputs and Switching Regulator Compensation Points.
Each associated channel’s current comparator trip point
increases with this control voltage.
VFB1 (Pin 30/Pin 2): For the LTC3892-1, this pin receives
the remotely sensed feedback voltage for channel 1 from
an external resistor divider across the output.
For the LTC3892, if the VPRG1 pin is floating, the VFB1 pin
receives the remotely sensed feedback voltage for chan-
nel 1 from an external resistor divider across the output.
If VPRG1 is tied to GND or INTVCC, the VFB1 pin receives
the remotely sensed output voltage directly.
SENSE1+, SENSE2+ (Pins 31, 10/Pins 3, 11): The (+)
Input to the Differential Current Comparators. The ITH pin
voltage and controlled offsets between the SENSEand
SENSE+ pins in conjunction with RSENSE set the current
trip threshold.
SENSE1, SENSE2(Pins 32, 9/Pins 4, 10): The (–) Input
totheDifferentialCurrentComparators.WhenSENSE1,2is
greater than INTVCC, then SENSE1,2pin supplies current
to the current comparator.
GND (Exposed Pad Pin 33/Exposed Pad Pin 29): Ground.
The exposed pad must be soldered to the PCB for rated
electrical and thermal performance.
Table 1. Summary of the Differences Between the LTC3892 and LTC3892-1
LTC3892
LTC3892-1
ILIM pin for selectable current sense voltage? Yes; 50mV, 75mV, or 100mV
No; fixed 75mV
VPRG1 pin for fixed or adjustable VOUT1?
Yes; fixed 3.3V or 5V (with internal resistor divider)
or adjustable with external resistor divider
No; only adjustable with external resistor divider
Independent PGOOD output for each channel? Yes; PGOOD1 and PGOOD2
No PGOOD function
Package
32-Pin 5mm
× 5mm QFN (UH32)
28-Lead TSSOP (FE28)


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