LTC3548 datasheet(5/16 Pages) LINER

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LTC3548

3548fc

VFB1 (Pin 1): Output Feedback. Receives the feedback

voltage from the external resistive divider across the

output. Nominal voltage for this pin is 0.6V.

RUN1 (Pin 2): Regulator 1 Enable. Forcing this pin to VIN

enables regulator 1, while forcing it to GND causes regulator

1 to shut down. This pin must be driven; do not ﬂoat.

VIN (Pin3):MainPowerSupply.Mustbecloselydecoupled

to GND.

SW1 (Pin 4): Regulator 1 Switch Node Connection to the

Inductor. This pin swings from VIN to GND.

GND (Pin 5): Ground. This pin is not connected internally.

Connect to PCB ground for optimum shielding.

MODE/SYNC (Pin 6): Combination Mode Selection and

Oscillator Synchronization. This pin controls the operation

of the device. When tied to VIN or GND, Burst Mode

operation or pulse-skipping mode is selected, respectively.

Do not ﬂoat this pin. The oscillation frequency can be

synchronized to an external oscillator applied to this pin

and pulse-skipping mode is automatically selected.

SW2 (Pin 7): Regulator 2 Switch Node Connection to the

Inductor. This pin swings from VIN to GND.

POR (Pin 8): Power-On Reset . This common-drain logic

output is pulled to GND when the output voltage falls

below –8.5% of regulation and goes high after 117ms

when both channels are within regulation.

RUN2 (Pin 9): Regulator 2 Enable. Forcing this pin to VIN

enables regulator 2, while forcing it to GND causes regulator

2 to shut down. This pin must be driven; do not ﬂoat.

VFB2 (Pin 10): Output Feedback. Receives the feedback

voltage from the external resistive divider across the output.

Nominal voltage for this pin is 0.6V.

Exposed Pad (GND) (Pin 11): Power Ground. Connect to

the (–) terminal of COUT, and (–) terminal of CIN. Must be

connected to electrical ground on PCB.

PIN FUNCTIONS

TYPICAL PERFORMANCE CHARACTERISTICS

Efﬁciency vs Load Current

TA = 25°C unless otherwise speciﬁed.

LOAD CURRENT (mA)

100

1000

3548 G10

3.6V

2.7V

4.2V

VOUT = 2.5V, CHANNEL 1

Burst Mode OPERATION

NO LOAD ON OTHER CHANNEL

CIRCUIT OF FIGURE 3

LOAD CURRENT (mA)

100

1000

3548 G14

2.7V

4.2V

VOUT = 1.5V, CHANNEL 1

Burst Mode OPERATION

NO LOAD ON OTHER CHANNEL

CIRCUIT OF FIGURE 3

3.6V

LOAD CURRENT (mA)

100

1000

3548 G13

2.7V

4.2V

VOUT = 1.2V, CHANNEL 1

Burst Mode OPERATION

NO LOAD ON OTHER CHANNEL

CIRCUIT OF FIGURE 3

3.6V

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