LTC3442 datasheet(5/16 Pages) LINER

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LTC3532

3532fc

SW2

5V/DIV

SW1

5V/DIV

INDUCTOR

CURRENT

500mA/DIV

VOUT

100mV/DIV

4μs/DIV

VIN = 4.2V

VOUT = 3.3V

ILOAD = 20mA

COUT = 22μF

3535 G17

SW2

5V/DIV

SW1

5V/DIV

INDUCTOR

CURRENT

500mA/DIV

VOUT

100mV/DIV

4μs/DIV

VIN = 3.75V

VOUT = 3.3V

ILOAD = 20mA

COUT = 22μF

340612 G16

PI FU CTIO S

RT (Pin 1): Timing Resistor to Program the Oscillator

Frequency. The programming range is 300kHz to 2MHz.

f(kHz) =

48,000

RT(kΩ)

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

eration Threshold. Place 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

VOUT to force ﬁxed frequency 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 connected from SW1

to ground. Minimize trace length to minimize EMI.

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 SW2 does not exhibit excess voltage.

GND (Pin 5): Signal and Power Ground for the IC.

VOUT (Pin 6): Output of the Synchronous Rectiﬁer. A ﬁlter

capacitor is placed from VOUT to GND.

VIN (Pin 7): Input Supply Pin. Supplies current to the

inductor through SW1 and supplies internal VCC for the

IC. A ceramic bypass capacitor as close to the VIN pin and

GND (Pin 5) is required.

Switch Pins Before Entering

Buck Mode

Output Ripple at 100mA Load

Burst Mode, Boost

TYPICAL PERFOR A CE CHARACTERISTICS T

A = 25°C, unless otherwise speciﬁed.

Burst Mode, Buck-Boost

Burst Mode, Buck

SW1

2VDIV

SW2

2VDIV

40ns/DIV

VIN = 4V

VOUT = 3.3V

ILOAD = 100mA

3535 G13

VOUT

50mV/DIV

VOUT

50mV/DIV

VOUT

50mV/DIV

400ns/DIV

VOUT = 3.6V

IOUT = 100mA

COUT = 10μF

3535 G14

VIN = 2.4V

VIN = 3.6V

VIN = 4.5V

SW1

5V/DIV

SW2

5V/DIV

INDUCTOR

CURRENT

500mA/DIV

VOUT

100mV/DIV

4μs/DIV

VIN = 2.4V

VOUT = 3.3V

ILOAD = 20mA

COUT = 22μF

3535 G15

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