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LTC3252

3252f

1.2V Output Voltage vs Supply

Voltage

1.2V Efficiency vs Load Current

TYPICAL PERFOR A CE CHARACTERISTICS

FB1 (Pin 1): Feedback Input Pin 1. An output divider

should be connected from OUT1 to FB1 to program the

output voltage.

EN1 (Pin 2): Input Enable Pin 1. When EN1 is high, OUT1

is enabled. When EN1 is low OUT1 is shut down.

VIN (Pin 3): Input Supply Voltage. Operating VIN may be

between 2.7V and 5.5V. Bypass VIN with a ≥ 4.7µF (1µF

min) low ESR ceramic capacitor to GND (CIN).

Oscillator Max/Min Frequency vs

Supply Voltage

VIN (V)

2.7

0.8

1.0

1.2

1.4

1.6

2.0

3.2

3.7

4.2

4.7

3252 G07

5.2

1.8

0.9

1.1

1.3

1.5

1.9

1.7

–40

°C MAX

–40

°C MIN

°C MAX

°C MIN

°C MAX

°C MIN

VIN (V)

2.7

1.30

1.28

1.26

1.24

1.22

1.20

1.18

1.16

1.14

1.12

1.10

3.2

3.7

4.2

4.7

3252 G08

5.2

IOUT = 250mA

IOUT = 50mA

IOUT = 0mA

TA = 25°C

IOUT (mA)

0.1

100

3252 G09

100

1000

VIN = 2.8V

VIN = 4.5V

VIN = 3.5V

VIN = 3.1V

TA = 25°C

IOUT

250mA

VOUT

20mV/DIV

3252 G11

VIN = 3.6V

VOUT = 1.5V

20mA

VIN

4.5V

VOUT

10mV/DIV

3252 G12

VOUT = 1.5V

IOUT = 150mA

3.5V

Output Current Transient

Response

Line Transient Response

C1+ (Pin 4): Flying Capacitor 1 Positive Terminal (C1).

OUT1 (Pin 5): Regulated Output Voltage 1. OUT1 is

disconnected from VIN when in shutdown. Bypass OUT1

with a low ESR ceramic capacitor to GND (CO1). See

Output Capacitor Selection section for size requirements.

C1– (Pin 6): Flying Capacitor 1 Negative Terminal (C1).

GND (Pin 7): Ground. Connect to a ground plane for best

performance.

PI FU CTIO S

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