LTC3411AIMS(RevA) Ver la hoja de datos (PDF) - Linear Technology
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LTC3411AIMS Datasheet PDF : 20 Pages
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LTC3411A
PIN FUNCTIONS
SHDN/RT (Pin 1): Combination Shutdown and Timing
Resistor Pin. The oscillator frequency is programmed by
connecting a resistor from this pin to ground. Forcing
this pin to SVIN causes the device to be shut down. In
shutdown all functions are disabled.
SYNC/MODE (Pin 2): Combination Mode Selection and
Oscillator Synchronization Pin. This pin controls the op-
eration of the device. When tied to SVIN or SGND, Burst
Mode operation or pulse skipping mode is selected,
respectively. If this pin is held at half of SVIN, the forced
continuous mode is selected. The oscillation frequency
can be synchronized to an external oscillator applied to
this pin. When synchronized to an external clock pulse
skip mode is selected.
SGND (Pin 3): The Signal Ground Pin. All small-signal com-
ponents and compensation components should be con-
nected to this ground (see Board Layout Considerations).
SW (Pin 4): The Switch Node Connection to the Inductor.
This pin swings from PVIN to PGND.
PGND (Pin 5): Main Power Ground Pin. Connect to the
(–) terminal of COUT, and (–) terminal of CIN.
PVIN (Pin 6): Main Supply Pin. Must be closely decoupled
to PGND.
SVIN (Pin 7): The Signal Power Pin. All active circuitry
is powered from this pin. Must be closely decoupled to
SGND. SVIN must be greater than or equal to PVIN.
PGOOD (Pin 8): The Power Good Pin. This common drain
logic output is pulled to SGND when the output voltage is
not within ±7% of regulation.
VFB (Pin 9): Receives the feedback voltage from the ex-
ternal resistive divider across the output. Nominal voltage
for this pin is 0.8V.
ITH (Pin 10): Error Amplifier Compensation Point. The
current comparator threshold increases with this control
voltage. Nominal voltage range for this pin is 0.4V to
1.4V.
Exposed Pad (Pin 11): Power Ground. Must be soldered
to electrical ground on PCB.
PIN
NAME DESCRIPTION
1
SHDN/RT Shutdown/Timing Resistor
2
SYNC/MODE Mode Select/Sychronization Pin
3
SGND Signal Ground
4
SW
Switch Node
5
PGND Main Power Ground
6
PVIN
Main Power Supply
7
SVIN
Signal Power Supply
8
PGOOD Power Good Pin
9
VFB
Output Feedback Pin
10
ITH
Error Amplifier Compensation and Run Pin
NOMINAL (V)
MIN
TYP
MAX
–0.3
0.8
SVIN
0
SVIN
0
0
PVIN
0
–0.3
5.5
2.5
5.5
0
SVIN
0
0.8
1.0
0
1.5
ABSOLUTE MAX (V)
MIN
MAX
–0.3
SVIN + 0.3
–0.3
SVIN + 0.3
–0.3
PVIN + 0.3
–0.3
SVIN + 0.3
–0.3
6
–0.3
6
–0.3
SVIN + 0.3
–0.3
SVIN + 0.3
3411afa
7
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