LTC3727-1_15 Datasheet, PDF (7/32 Pages) Linear Technology – High Efficiency, 2-Phase Synchronous Step-Down Switching Regulators

TYPICAL PERFOR A CE CHARACTERISTICS
LTC3727/LTC3727-1
Current Sense Pin Input Current
vs Temperature
35
V_OUT = 5V
33
31
29
27
EXTV_CC Switch Resistance
vs Temperature
10
8
6
4
2
Oscillator Frequency
vs Temperature
700
600
V_PLLFLTR = 5V
500
V_PLLFLTR = 1.2V
400
300
V_PLLFLTR = 0V
200
100
25
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3727 G22
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3727 G23
0
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
3727 G24
Undervoltage Lockout
vs Temperature
3.50
3.45
3.40
3.35
3.30
3.25
3.20
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3727 G25
Shutdown Latch Thresholds
vs Temperature
4.5
4.0
LATCH ARMING
3.5
3.0
LATCHOFF
THRESHOLD
2.5
2.0
1.5
1.0
0.5
LTC3727 ONLY
0
–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
3727 G26
PI FU CTIO S G Package/UH Package
RUN/SS1, RUN/SS2 (Pins 1, 15/Pins 28, 13): Combina-
tion of Soft-Start, Run Control Inputs and Short-Circuit
Detection Timers (LTC3727 only). A capacitor to ground at
each of these pins sets the ramp time to full output current.
Forcing either of these pins back below 1.0V causes the IC
to shut down the circuitry required for that particular
controller. Latchoff overcurrent protection is also invoked
via this pin as described in the Applications Information
section (LTC3727 only).
SENSE1⁺, SENSE2⁺ (Pins 2, 14/Pins 30, 12): The (+)
Input to the Differential Current Comparators. The I_TH pin
voltage and controlled offsets between the SENSE^– and
SENSE⁺ pins in conjunction with R_SENSE set the current
trip threshold.
SENSE1^–, SENSE2^– (Pins 3, 13/Pins 31, 11): The (–)
Input to the Differential Current Comparators.
V_OSENSE1, V_OSENSE2 (Pins 4, 12/Pins 1, 9): Receives the
remotely-sensed feedback voltage for each controller from
an external resistive divider across the output.
3727fc
7