LTC3561 Ver la hoja de datos (PDF) - Linear Technology
Número de pieza
componentes Descripción
Fabricante
LTC3561 Datasheet PDF : 16 Pages
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LTC3561
TYPICAL PERFOR A CE CHARACTERISTICS
Frequency Variation
vs Temperature
10
8
6
4
2
0
–2
–4
–6
–8
–10
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3561 G10
Efficiency vs Frequency
100
VIN = 3.3V
VOUT = 2.5V
IOUT = 500mA
TA = 25°C
95
90
85
0
1
2
3
FREQUENCY (MHz)
4
3561 G11
RDS(ON) vs VIN
120
TA = 25°C
115
110
SYNCHRONOUS SWITCH
105
MAIN SWITCH
100
95
90
2.5 3 3.5 4 4.5 5 5.5 6
VIN (V)
3561 G12
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.
3561f
4
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