LTC3552-1

3

35521fa

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

PROG Pin Voltage

0.93

1

1.07

V

CHRG Pin Output Low Voltage

0.35

0.6

V

PWR Pin Output Low Voltage

0.35

0.6

V

Recharge Battery Threshold Voltage

60

100

140

mV

Junction Temperature in Constant-

Temperature Mode

120

°C

Charger’s Power FET “ON” Resistance

600

m

Ω

Charger Soft-Start Time

100

µs

Recharge Comparator Filter Time

0.75

2

4.5

ms

Termination Comparator Filter Time

Threshold

0.4

1

2.5

ms

Switching Regulator

Operating Voltage Range for Converter

●

2.5

5.5

V

Output Voltage Feedback of Regulator 1

●

1.764

1.755

1.8

1.8

1.836

1.836

V

V

Output Voltage Feedback of Regulator 2

●

1.544

1.536

1.575

1.575

1.607

1.607

V

V

Reference Voltage Line Regulation

0.3

0.5

%/V

Output Voltage Load Regulation

(Note 5)

0.5

%

Input DC Supply Current (Note 6)

Active Mode

Sleep Mode

Shutdown

700

40

0.1

950

60

1

µA

µA

µA

Oscillator Frequency

●

1.8

2.25

2.7

MHz

Peak Switch Current Limit Regulator 1

Peak Switch Current Limit Regulator 2

0.95

0.6

1.2

0.7

1.6

0.9

A

A

Converter Top Switch On-Resistance

Converter Bottom Switch On-Resistance

(Note 7)

(Note 7)

0.35

0.3

0.45

0.45

Ω

Ω

Switch Leakage Current

0.01

1

µA

RUN Threshold Voltage

●

0.3

1

1.5

V

RUN Leakage Current

●

0.01

1

µA

The

ELECTRICAL CHARACTERISTICS

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 LTC3552E-1 is 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 controls.

Note 3: Failure to solder the exposed backside of the package to the PC

board will result in a thermal resistance much higher than 40°C/W. See

Thermal Considerations.

Note 4: Supply current includes PROG pin current and ITERM pin current

(approximately 100µA each) but does not include any current delivered to

the battery through the BAT pin (approximately 100mA).

Note 5: The converter is tested in a proprietary test mode that connects

the output of the error amplifier to the SW pin, which is connected to an

external servo loop.

Note 6: Dynamic supply current is higher due to the internal gate charge

being delivered at the switching frequency.

Note 7: The regulator power switch on-resistances are guaranteed by

correlation to wafer level measurements.