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LTC3523/LTC3523-2

3523fb

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The LTC3523/LTC3523-2 are guaranteed to meet performance

speciﬁcations from 0°C to 85°C. Speciﬁcations over the –40°C to 85°C

operating temperature range are assured by design, characterization and

correlation with statistical process control.

Note 3: The LTC3523/LTC3523-2 include an overtemperature

shutdown that is intended to protect the device during momentary

overload conditions. Junction temperature will exceed 125°C when the

overtemperature shutdown is active. Continuous operation above the

speciﬁed maximum operating junction temperature may impair device

reliability.

ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at TA = 25°C. VIN1 = VIN2 = VBAT = 2.4V, VOUT = 3.3V, unless otherwise speciﬁed.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

MODE Leakage Current

VMODE = 5.5V

0.01

μA

Soft-Start Time

500

μs

Step-Up Converter

Input Voltage Range

1.8

5.25

Output Voltage Adjust Range

(Note 6)

1.8

5.25

Feedback Voltage FB1

1.16

1.20

1.23

Feedback Input Current FB1

VFB1 = 1.25V

N-Channel Switch Leakage

VSW = 5.5V

0.20

μA

P-Channel Switch Leakage

VSW = 5.5V, VOUT = 0V

0.20

μA

N-Channel Switch On Resistance

VOUT = 3.3V

VOUT = 5V

0.36

0.22

P-Channel Switch On Resistance

VOUT = 3.3V, ISW = 100mA

VOUT = 5V, ISW = 100mA

0.33

0.31

Peak Inductor Current

(Note 7)

600

1000

Current Limit Delay to Output

(Note 6)

Maximum Duty Cycle

VFB = 1V

Minimum Duty Cycle

VFB = 1.5V

Step-Down Converter

Input Voltage Range

1.8

5.5

Output Voltage Range

(Note 6)

0.615

5.5

Feedback Voltage FB2

585

600

615

Feedback Input Current FB2

VFB2 = 0.625V

Reference Voltage Line Regulation

IOUT = 100mA (Notes 5, 6)

0.04

%/V

Output Voltage Line Regulation

IOUT = 100mA, 1.6V < VIN < 5.5V (Note 6)

0.04

%/V

Output Voltage Load Regulation

IOUT = 0mA to 600mA (Note 6)

1.0

Maximum Duty Cycle

100

Peak Inductor Current

(Note 7)

400

650

N-Channel Switch On Resistance

VIN2 = 2.4V

0.33

P-Channel Switch On Resistance

VIN2 = 2.4V

0.58

SW Leakage

VSHDN2 = 0V, VSW2 = 0V or 5V, VIN2 = 5.5V

0.20

μA

Note 4: Current is measured into the VOUT pin since the supply is

bootstrapped to the output for the step-up. The current will reﬂect to the

input supply by: (VOUT/VIN) • Efﬁciency. The outputs are not switching in

sleep.

Note 5: The LTC3523/LTC3523-2 are tested in a propriety test mode that

connects FB2 to the output of the error ampliﬁer.

Note 6: Speciﬁcation is guaranteed by design and not 100% tested in

production.

Note 7: Current measurements are performed when the LTC3523/

LTC3523-2 are not switching. The current limit values in operation will be

somewhat higher due to the propagation delay of the comparator.

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