LTC3523 datasheet(4/16 Pages) LINER

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LTC3523/LTC3523-2

3523fb

TYPICAL PERFORMANCE CHARACTERISTICS

Normalized FBx Reference vs

Temperature

Inrush Current Control for the

Step-Up Converter

Inrush Current Control for the

Step-Down Converter

Load Transient Response Step-Up

Load Transient Response

Step-Down

Current Limit vs Temperature

RDS(ON) vs Input Voltage for the

Step-Down Converter

Normalized Oscillator Frequency

vs Temperature

TEMPERATURE (°C)

–45

–25

–5

1.00000

1.00125

3523 G01

0.99875

0.99500

0.99750

0.99625

TEMPERATURE (°C)

–45

–25

–5

1.00

1.05

3523 G02

0.95

VOUT_BCK

1V/DIV

IL_BCK

200mA/DIV

200μs/DIV

3523 G04

VOUT = 1.2V

VIN = 2.4V

COUT = 10μF

L1 = 4.7μH

SHDN2

2V/DIV

OUTPUT

RIPPLE

20mV/DIV

LOAD

CURRENT

20mA/DIV

500μs/DIV

3523 G05

VOUT = 3.3V

VIN = 2.4V

COUT = 10μF

L1 = 4.7μH

20mA TO 70mA STEP

OUTPUT

RIPPLE

20mV/DIV

LOAD

CURRENT

20mA/DIV

500μs/DIV

3523 G06

VOUT = 1.2V

VIN = 2.4V

COUT = 47μF

L1 = 4.7μH

CF = 68pF

10mA TO 30mA STEP

RDS(ON) vs Output Voltage for the

Step-Up Converter

TEMPERATURE (°C)

–45

0.8

1.0

1.2

3523 G07

0.6

0.4

–25

–5

0.2

BOOST CURRENT

LIMIT

BUCK CURRENT

LIMIT

INPUT VOLTAGE (V)

0.40

0.60

3523 G08

0.20

1.5

2.5

3.5

4.5

0.80

0.30

0.50

0.10

0.70

PMOS

NMOS

OUTPUT VOLTAGE (V)

0.05

0.15

0.20

0.25

0.50

0.35

3.5

3532 G09

0.10

0.40

0.45

0.30

1.5

2.5

4.5

PMOS

NMOS

(TA = 25°C unless otherwise noted)

VOUT_BST

2V/DIV

IL_BST

200mA/DIV

SHDN1

2V/DIV

200μs/DIV

3523 G03

VOUT = 3.3V

VIN = 2.4V

COUT = 10μF

L1 = 4.7μH

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