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LTC3561

3561f

TYPICAL PERFOR A CE CHARACTERISTICS

2.5

3.5

4.5

5.5

VIN (V)

120

115

110

105

100

3561 G12

MAIN SWITCH

SYNCHRONOUS SWITCH

TA = 25°C

Frequency Variation

vs Temperature

RDS(ON) vs VIN

–50

–25

100

125

TEMPERATURE (

°C)

–2

–4

–6

–8

–10

3561 G10

FREQUENCY (MHz)

100

3561 G11

VIN = 3.3V

VOUT = 2.5V

IOUT = 500mA

TA = 25°C

Efficiency vs Frequency

PI FU CTIO S

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.

SGND (Pin 2): The Signal Ground Pin. All small signal

components and compensation components should be

connected to this ground (see Board Layout

Considerations).

SW (Pin 3): The Switch Node Connection to the Inductor.

This pin swings from PVIN to PGND.

PGND (Pin 4): Main Power Ground Pin. Connect to the

(–) terminal of COUT, and (–) terminal of CIN.

PVIN (Pin 5): Main Supply Pin. Must be closely decoupled

to PGND.

SVIN (Pin 6): 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.

VFB (Pin 7): Receives the feedback voltage from the

external resistive divider across the output. Nominal

voltage for this pin is 0.8V.

ITH (Pin 8): Error Amplifier Compensation Point. The

current comparator threshold increases with this control

voltage. Nominal voltage range for this pin is 0V to 1.5V.

Exposed Pad (Pin 9): Thermal Connection to PCB. This

pin should be soldered to ground to achieve rated

thermal performance.

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