3412EFE 查看數據表（PDF） - Linear Technology

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3412EFE

2.5A, 4MHz, Monolithic Synchronous Step-Down Regulator

Linear Technology 

LTC3412

PI FU CTIO S (FE/UH Package)

SVIN (Pin 1/Pin 11): Signal Input Supply. Decouple this

pin to SGND with a capacitor. Normally SVIN is equal to

PVIN. SVIN can be greater than PVIN but keep the voltage

difference between SVIN and PVIN less than 0.5V.

PGOOD (Pin 2/Pin 12): Power Good Output. Open-drain

logic output that is pulled to ground when the output

voltage is not within ±7.5% of regulation point.

ITH (Pin 3/Pin 13): Error Amplifier Compensation Point.

The current comparator threshold increases with this

control voltage. Nominal voltage range for this pin is from

0.2V to 1.4V with 0.2V corresponding to the zero-sense

voltage (zero current).

VFB (Pin 4/Pin 14): Feedback Pin. Receives the feedback

voltage from a resistive divider connected across the

output.

RT (Pin 5/Pin 15): Oscillator Resistor Input. Connecting a

resistor to ground from this pin sets the switching fre-

quency.

SYNC/MODE (Pin 6/Pin 16): Mode Select and External

Clock Synchronization Input. To select forced continuous,

tie to SVIN. Connecting this pin to a voltage between 0V and

1V selects Burst Mode operation with the burst clamp set

to the pin voltage.

RUN/SS (Pin 7/Pin 1): Run Control and Soft-Start Input.

Forcing this pin below 0.5V shuts down the LTC3412. In

shutdown all functions are disabled drawing < 1μA of

supply current. A capacitor to ground from this pin sets the

ramp time to full output current.

SGND (Pin 8/Pin 2): Signal Ground. All small-signal

components, compensation components and the exposed

pad on the bottom side of the IC should connect to this

ground, which in turn connects to PGND at one point.

PVIN (Pins 9, 16/Pins 3, 10): Power Input Supply. Decouple

this pin to PGND with a capacitor.

SW (Pins 10, 11, 14, 15/Pins 4, 5, 8, 9): Switch Node

Connection to the Inductor. This pin connects to the drains

of the internal main and synchronous power MOSFET

switches.

PGND (Pins 12, 13/Pins 6, 7): Power Ground. Connect

this pin close to the (–) terminal of CIN and COUT.

Exposed Pad (Pin 17/Pin 17): Signal Ground. Must be

soldered to PCB for electrical connection and thermal

performance.

3412fb

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