LTC3530 datasheet(5/16 Pages) LINER

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LTC3530

3530fb

Load Transient Response in Fixed

Frequency Mode, No Load to 300mA

Load Transient Response in

Auto Burst Mode Operation,

No Load to 500mA

Typical Burst Mode Waveforms

Transition from Burst Mode

Operation to Fixed Frequency Mode

Maximum Output Current vs VIN

100μs/DIV

3530 G13

VIN = 3.6V

VOUT = 3.3V

COUT = 22μF, X5R CERAMIC

LOAD

0.25A/DIV

VOUT

100mV/DIV

100μs/DIV

3530 G14

VIN = 3.6V

VOUT = 3.3V

COUT = 47μF, X5R CERAMIC + 100μF

LOW ESR TANTALUM

LOAD

0.25A/DIV

VOUT

100mV/DIV

22μs/DIV

3530 G15

COUT = 22μF, X5R CERAMIC

INDUCTOR

CURRENT

0.25A/DIV

VOUT

50mV/DIV

200μs/DIV

3530 G16

COUT = 22μF, X5R CERAMIC

INDUCTOR

CURRENT

0.5A/DIV

BURST

2V/DIV

VOUT

200mV/DIV

TA = 25°C, unless otherwise speciﬁed.

VIN (V)

IOUT

1.5

200

400

800

1000

1200

3.5

5.5

2000

3530 G17

600

2.5

4.5

1400

1600

1800

250mA AT 1.8V

RT (Pin 1): Programs the Frequency of the Internal Oscil-

lator. Connect a resister from RT to ground.

f(kHz) = 33,170/RT (kΩ)

BURST (Pin 2): Used to Set the Automatic Burst Mode

Threshold. Connect a resistor and capacitor in parallel

from this pin to ground. See the Applications Information

section for component value selection. For manual control,

ground the pin to force Burst Mode operation, connect to

VIN to force ﬁxed frequency PWM mode.

SW1 (Pin 3): Switch Pin Where the Internal Switches A and

B are Connected. Connect inductor from SW1 to SW2. An

optional Schottky diode can be connnected from SW1 to

ground for a moderate efﬁciency improvement. Minimize

trace length to keep EMI down.

SW2 (Pin 4): Switch Pin Where the Internal Switches C

and D are Connected. For applications with output voltages

over 4.3V, a Schottky diode is required from SW2 to VOUT

to ensure the SW pin does not exhibit excessive voltage.

TYPICAL PERFORMANCE CHARACTERISTICS

PIN FUNCTIONS

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